shadow.cpp

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#include "shadow.h"
 
#include <engine/assets/asset_manager.h>
#include <engine/defaults/defaults.h>
#include <engine/ecs/components/transform_component.h>
#include <engine/engine.h>
#include <engine/events.h>
#include <engine/rendering/camera.h>
#include <engine/rendering/ecs/components/camera_component.h>
#include <engine/rendering/ecs/components/model_component.h>
#include <engine/rendering/material.h>
#include <engine/rendering/mesh.h>
#include <engine/rendering/model.h>
#include <engine/rendering/renderer.h>
 
#include <graphics/index_buffer.h>
#include <graphics/render_pass.h>
#include <graphics/render_view.h>
#include <graphics/texture.h>
#include <graphics/vertex_buffer.h>
 
namespace unravel
{
namespace shadow
{
 
namespace
{
 
// clang-format off
RenderState render_states[RenderState::Count] =
    {
        { // Default
            0
                | BGFX_STATE_WRITE_RGB
                | BGFX_STATE_WRITE_A
                | BGFX_STATE_DEPTH_TEST_LESS
                | BGFX_STATE_WRITE_Z
                | BGFX_STATE_CULL_CCW
                | BGFX_STATE_MSAA
            , UINT32_MAX
            , BGFX_STENCIL_NONE
            , BGFX_STENCIL_NONE
        },
        { // ShadowMap_PackDepth
            0
                | BGFX_STATE_WRITE_RGB
                | BGFX_STATE_WRITE_A
                | BGFX_STATE_WRITE_Z
                | BGFX_STATE_DEPTH_TEST_LESS
                | BGFX_STATE_CULL_CCW
                | BGFX_STATE_MSAA
            , UINT32_MAX
            , BGFX_STENCIL_NONE
            , BGFX_STENCIL_NONE
        },
        { // ShadowMap_PackDepthHoriz
            0
                | BGFX_STATE_WRITE_RGB
                | BGFX_STATE_WRITE_A
                | BGFX_STATE_WRITE_Z
                | BGFX_STATE_DEPTH_TEST_LESS
                | BGFX_STATE_CULL_CCW
                | BGFX_STATE_MSAA
            , UINT32_MAX
            , BGFX_STENCIL_TEST_EQUAL
                | BGFX_STENCIL_FUNC_REF(1)
                | BGFX_STENCIL_FUNC_RMASK(0xff)
                | BGFX_STENCIL_OP_FAIL_S_KEEP
                | BGFX_STENCIL_OP_FAIL_Z_KEEP
                | BGFX_STENCIL_OP_PASS_Z_KEEP
            , BGFX_STENCIL_NONE
        },
        { // ShadowMap_PackDepthVert
            0
                | BGFX_STATE_WRITE_RGB
                | BGFX_STATE_WRITE_A
                | BGFX_STATE_WRITE_Z
                | BGFX_STATE_DEPTH_TEST_LESS
                | BGFX_STATE_CULL_CCW
                | BGFX_STATE_MSAA
            , UINT32_MAX
            , BGFX_STENCIL_TEST_EQUAL
                | BGFX_STENCIL_FUNC_REF(0)
                | BGFX_STENCIL_FUNC_RMASK(0xff)
                | BGFX_STENCIL_OP_FAIL_S_KEEP
                | BGFX_STENCIL_OP_FAIL_Z_KEEP
                | BGFX_STENCIL_OP_PASS_Z_KEEP
            , BGFX_STENCIL_NONE
        },
        { // Custom_BlendLightTexture
            BGFX_STATE_WRITE_RGB
                | BGFX_STATE_WRITE_A
                | BGFX_STATE_WRITE_Z
                | BGFX_STATE_DEPTH_TEST_LESS
                | BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_SRC_COLOR, BGFX_STATE_BLEND_INV_SRC_COLOR)
                | BGFX_STATE_CULL_CCW
                | BGFX_STATE_MSAA
            , UINT32_MAX
            , BGFX_STENCIL_NONE
            , BGFX_STENCIL_NONE
        },
        { // Custom_DrawPlaneBottom
            BGFX_STATE_WRITE_RGB
                | BGFX_STATE_CULL_CW
                | BGFX_STATE_MSAA
            , UINT32_MAX
            , BGFX_STENCIL_NONE
            , BGFX_STENCIL_NONE
        },
        };
// clang-format on
 
auto convert(light_type t) -> LightType::Enum
{
    static_assert(std::uint8_t(light_type::count) == std::uint8_t(LightType::Count), "Missing impl");
 
    switch(t)
    {
        case light_type::spot:
            return LightType::SpotLight;
        case light_type::point:
            return LightType::PointLight;
        default:
            return LightType::DirectionalLight;
    }
}
 
auto convert(sm_impl t) -> SmImpl::Enum
{
    static_assert(std::uint8_t(sm_impl::count) == std::uint8_t(SmImpl::Count), "Missing impl");
 
    switch(t)
    {
        case sm_impl::hard:
            return SmImpl::Hard;
 
        case sm_impl::pcf:
            return SmImpl::PCF;
 
        case sm_impl::pcss:
            return SmImpl::PCSS;
 
        case sm_impl::esm:
            return SmImpl::ESM;
 
        case sm_impl::vsm:
            return SmImpl::VSM;
        default:
            return SmImpl::Count;
    }
}
 
auto convert(sm_depth t) -> DepthImpl::Enum
{
    static_assert(std::uint8_t(sm_depth::count) == std::uint8_t(DepthImpl::Count), "Missing impl");
    switch(t)
    {
        case sm_depth::invz:
            return DepthImpl::InvZ;
 
        case sm_depth::linear:
            return DepthImpl::Linear;
 
        default:
            return DepthImpl::Count;
    }
}
 
auto convert(sm_resolution t) -> float
{
    switch(t)
    {
        case sm_resolution::low:
            return 8;
 
        case sm_resolution::medium:
            return 9;
 
        case sm_resolution::high:
            return 10;
 
        case sm_resolution::very_high:
            return 11;
 
        default:
            return 10;
    }
}
 
void mtxYawPitchRoll(float* _result, float _yaw, float _pitch, float _roll)
{
    float sroll = bx::sin(_roll);
    float croll = bx::cos(_roll);
    float spitch = bx::sin(_pitch);
    float cpitch = bx::cos(_pitch);
    float syaw = bx::sin(_yaw);
    float cyaw = bx::cos(_yaw);
 
    _result[0] = sroll * spitch * syaw + croll * cyaw;
    _result[1] = sroll * cpitch;
    _result[2] = sroll * spitch * cyaw - croll * syaw;
    _result[3] = 0.0f;
    _result[4] = croll * spitch * syaw - sroll * cyaw;
    _result[5] = croll * cpitch;
    _result[6] = croll * spitch * cyaw + sroll * syaw;
    _result[7] = 0.0f;
    _result[8] = cpitch * syaw;
    _result[9] = -spitch;
    _result[10] = cpitch * cyaw;
    _result[11] = 0.0f;
    _result[12] = 0.0f;
    _result[13] = 0.0f;
    _result[14] = 0.0f;
    _result[15] = 1.0f;
}
 
void screenSpaceQuad(bool _originBottomLeft = true, float _width = 1.0f, float _height = 1.0f)
{
    if(3 == bgfx::getAvailTransientVertexBuffer(3, PosColorTexCoord0Vertex::get_layout()))
    {
        bgfx::TransientVertexBuffer vb;
        bgfx::allocTransientVertexBuffer(&vb, 3, PosColorTexCoord0Vertex::get_layout());
        PosColorTexCoord0Vertex* vertex = (PosColorTexCoord0Vertex*)vb.data;
 
        const float zz = 0.0f;
 
        const float minx = -_width;
        const float maxx = _width;
        const float miny = 0.0f;
        const float maxy = _height * 2.0f;
 
        const float minu = -1.0f;
        const float maxu = 1.0f;
 
        float minv = 0.0f;
        float maxv = 2.0f;
 
        if(_originBottomLeft)
        {
            std::swap(minv, maxv);
            minv -= 1.0f;
            maxv -= 1.0f;
        }
 
        vertex[0].m_x = minx;
        vertex[0].m_y = miny;
        vertex[0].m_z = zz;
        vertex[0].m_rgba = 0xffffffff;
        vertex[0].m_u = minu;
        vertex[0].m_v = minv;
 
        vertex[1].m_x = maxx;
        vertex[1].m_y = miny;
        vertex[1].m_z = zz;
        vertex[1].m_rgba = 0xffffffff;
        vertex[1].m_u = maxu;
        vertex[1].m_v = minv;
 
        vertex[2].m_x = maxx;
        vertex[2].m_y = maxy;
        vertex[2].m_z = zz;
        vertex[2].m_rgba = 0xffffffff;
        vertex[2].m_u = maxu;
        vertex[2].m_v = maxv;
 
        bgfx::setVertexBuffer(0, &vb);
    }
}
 
 
void world_space_frustum_corners_legacy(float* corners24f,
                                       float near_plane,
                                       float far_plane,
                                       float proj_width,
                                       float proj_height,
                                       const float* inv_view_mtx)
{
    // Define frustum corners in view space.
    const float nw = near_plane * proj_width;
    const float nh = near_plane * proj_height;
    const float fw = far_plane * proj_width;
    const float fh = far_plane * proj_height;
 
    const uint8_t num_corners = 8;
    const bx::Vec3 corners[num_corners] = {
        {-nw, nh, near_plane},
        {nw, nh, near_plane},
        {nw, -nh, near_plane},
        {-nw, -nh, near_plane},
        {-fw, fh, far_plane},
        {fw, fh, far_plane},
        {fw, -fh, far_plane},
        {-fw, -fh, far_plane},
    };
 
    // Convert them to world space.
    float(*out)[3] = (float(*)[3])corners24f;
    for(uint8_t ii = 0; ii < num_corners; ++ii)
    {
        bx::store(&out[ii], bx::mul(corners[ii], inv_view_mtx));
    }
}
 
void world_space_frustum_corners_adaptive(float* corners24f,
                                         float near_plane,
                                         float far_plane,
                                         float proj_width,
                                         float proj_height,
                                         const float* inv_view_mtx,
                                         float altitude_scale_factor,
                                         float min_altitude_boost,
                                         float max_altitude_boost)
{
    // Extract camera position from inverse view matrix
    bx::Vec3 camera_pos = {inv_view_mtx[12], inv_view_mtx[13], inv_view_mtx[14]};
 
    // Compute camera altitude above the ground plane (assuming Y is up)
    const float altitude = camera_pos.y;
    const float clamped_altitude = bx::clamp(altitude, 0.0f, max_altitude_boost);
 
    // Adaptive scaling based on altitude
    const float altitude_boost = bx::max(min_altitude_boost, clamped_altitude * altitude_scale_factor);
    
    // Adjust near and far planes based on altitude
    const float actual_near = bx::max(0.01f, near_plane - altitude_boost * 0.1f); // Pull near plane closer for high cameras
    const float actual_far = far_plane + altitude_boost;                          // Push far plane further for high cameras
 
    // Compute corners in view space using adjusted near/far
    const float nw = actual_near * proj_width;
    const float nh = actual_near * proj_height;
    const float fw = actual_far * proj_width;
    const float fh = actual_far * proj_height;
 
    const uint8_t num_corners = 8;
    const bx::Vec3 corners[num_corners] = {
        {-nw, nh, actual_near},
        {nw, nh, actual_near},
        {nw, -nh, actual_near},
        {-nw, -nh, actual_near},
        {-fw, fh, actual_far},
        {fw, fh, actual_far},
        {fw, -fh, actual_far},
        {-fw, -fh, actual_far},
    };
 
    // Convert them to world space.
    float(*out)[3] = (float(*)[3])corners24f;
    for(uint8_t ii = 0; ii < num_corners; ++ii)
    {
        bx::store(&out[ii], bx::mul(corners[ii], inv_view_mtx));
    }
}
 
void world_space_frustum_corners_hybrid(float* corners24f,
                                       float near_plane,
                                       float far_plane,
                                       float proj_width,
                                       float proj_height,
                                       const float* inv_view_mtx,
                                       float blend_factor)
{
    // Get both legacy and adaptive results
    float legacy_corners[8][3];
    float adaptive_corners[8][3];
    
    world_space_frustum_corners_legacy((float*)legacy_corners, near_plane, far_plane, proj_width, proj_height, inv_view_mtx);
    world_space_frustum_corners_adaptive((float*)adaptive_corners, near_plane, far_plane, proj_width, proj_height, inv_view_mtx, 0.5f, 0.05f, 100.0f);
    
    // Blend between the two approaches
    float(*out)[3] = (float(*)[3])corners24f;
    for(uint8_t ii = 0; ii < 8; ++ii)
    {
        for(uint8_t jj = 0; jj < 3; ++jj)
        {
            out[ii][jj] = bx::lerp(legacy_corners[ii][jj], adaptive_corners[ii][jj], blend_factor);
        }
    }
}
 
 
 
void worldSpaceFrustumCorners(float* _corners24f,
    float _near,
    float _far,
    float _projWidth,
    float _projHeight,
    const float* _invViewMtx)
{
    // Original/Legacy implementation
    world_space_frustum_corners_legacy(_corners24f, _near, _far, _projWidth, _projHeight, _invViewMtx);
}
 
 
void compute_world_space_frustum_corners(float* corners24f,
    float near_plane,
    float far_plane,
    float proj_width,
    float proj_height,
    const float* inv_view_mtx,
    frustum_calculation_method::Enum method,
    const adaptive_shadow_params& params)
{
    switch(method)
    {
    case frustum_calculation_method::adaptive:
    world_space_frustum_corners_adaptive(corners24f,
            near_plane,
            far_plane,
            proj_width,
            proj_height,
            inv_view_mtx,
            params.altitude_scale_factor,
            params.min_altitude_boost,
            params.max_altitude_boost);
    break;
 
    case frustum_calculation_method::hybrid:
    world_space_frustum_corners_hybrid(corners24f,
            near_plane,
            far_plane,
            proj_width,
            proj_height,
            inv_view_mtx,
            0.5f); // 50% blend
    break;
 
    case frustum_calculation_method::legacy:
    default:
    world_space_frustum_corners_legacy(corners24f,
            near_plane,
            far_plane,
            proj_width,
            proj_height,
            inv_view_mtx);
    break;
    }
}
 
void split_frustum_legacy(float* splits, uint8_t num_splits, float near_plane, float far_plane, float split_weight)
{
    auto factor = float(num_splits) / 4.0f;
    far_plane = far_plane * factor;
 
    const float l = split_weight;
    const float ratio = far_plane / near_plane;
    const int8_t num_slices = num_splits * 2;
    const float num_slices_f = float(num_slices);
 
    // First slice.
    splits[0] = near_plane;
 
    for(uint8_t nn = 2, ff = 1; nn < num_slices; nn += 2, ff += 2)
    {
        float si = float(int8_t(ff)) / num_slices_f;
 
        const float near_p = l * (near_plane * bx::pow(ratio, si)) + (1 - l) * (near_plane + (far_plane - near_plane) * si);
        splits[nn] = near_p;          // near
        splits[ff] = near_p * 1.005f; // far from previous split
    }
 
    // Last slice.
    splits[num_slices - 1] = far_plane;
}
 
void split_frustum_adaptive(float* splits, uint8_t num_splits, float near_plane, float far_plane, 
                           float split_weight, float camera_altitude, float altitude_influence = 0.2f)
{
    auto factor = float(num_splits) / 4.0f;
    far_plane = far_plane * factor;
 
    // Adjust split weight based on camera altitude - higher cameras benefit from more uniform distribution
    const float altitude_factor = bx::clamp(camera_altitude * altitude_influence, 0.0f, 1.0f);
    const float adjusted_split_weight = bx::lerp(split_weight, 0.5f, altitude_factor); // Move towards linear distribution
 
    const float l = adjusted_split_weight;
    const float ratio = far_plane / near_plane;
    const int8_t num_slices = num_splits * 2;
    const float num_slices_f = float(num_slices);
 
    // First slice.
    splits[0] = near_plane;
 
    for(uint8_t nn = 2, ff = 1; nn < num_slices; nn += 2, ff += 2)
    {
        float si = float(int8_t(ff)) / num_slices_f;
 
        // Apply non-linear distribution that favors distant splits for high cameras
        if(camera_altitude > 10.0f)
        {
            si = bx::pow(si, 0.8f); // Slightly favor distant splits
        }
 
        const float near_p = l * (near_plane * bx::pow(ratio, si)) + (1 - l) * (near_plane + (far_plane - near_plane) * si);
        splits[nn] = near_p;          // near
        splits[ff] = near_p * 1.005f; // far from previous split
    }
 
    // Last slice.
    splits[num_slices - 1] = far_plane;
}
 
 void splitFrustum(float* _splits, uint8_t _numSplits, float _near, float _far, float _splitWeight = 0.75f)
 {
     split_frustum_legacy(_splits, _numSplits, _near, _far, _splitWeight);
 }
} // namespace
 
shadowmap_generator::shadowmap_generator()
{
    init(engine::context());
}
 
shadowmap_generator::~shadowmap_generator()
{
    deinit();
}
 
void shadowmap_generator::deinit()
{
    deinit_uniforms();
    deinit_textures();
}
 
void shadowmap_generator::deinit_textures()
{
    if(!valid_)
    {
        return;
    }
 
    valid_ = false;
 
    for(int i = 0; i < ShadowMapRenderTargets::Count; ++i)
    {
        if(bgfx::isValid(rt_shadow_map_[i]))
        {
            bgfx::destroy(rt_shadow_map_[i]);
            rt_shadow_map_[i] = {bgfx::kInvalidHandle};
        }
    }
 
    if(bgfx::isValid(rt_blur_))
    {
        bgfx::destroy(rt_blur_);
        rt_blur_ = {bgfx::kInvalidHandle};
    }
}
 
void shadowmap_generator::deinit_uniforms()
{
    if(bgfx::isValid(tex_color_))
    {
        bgfx::destroy(tex_color_);
    }
 
    for(int i = 0; i < ShadowMapRenderTargets::Count; ++i)
    {
        if(bgfx::isValid(shadow_map_[i]))
        {
            bgfx::destroy(shadow_map_[i]);
        }
    }
}
 
void shadowmap_generator::init(rtti::context& ctx)
{
    if(bgfx::isValid(tex_color_))
    {
        return;
    }
    // Uniforms.
    uniforms_.init();
    tex_color_ = bgfx::createUniform("s_texColor", bgfx::UniformType::Sampler);
    shadow_map_[0] = bgfx::createUniform("s_shadowMap0", bgfx::UniformType::Sampler);
    shadow_map_[1] = bgfx::createUniform("s_shadowMap1", bgfx::UniformType::Sampler);
    shadow_map_[2] = bgfx::createUniform("s_shadowMap2", bgfx::UniformType::Sampler);
    shadow_map_[3] = bgfx::createUniform("s_shadowMap3", bgfx::UniformType::Sampler);
 
    for(int i = 0; i < ShadowMapRenderTargets::Count; ++i)
    {
        rt_shadow_map_[i] = {bgfx::kInvalidHandle};
    }
 
    // Programs.
    programs_.init(ctx);
 
    // Lights.
    // clang-format off
    point_light_ =
        {
            { { 0.0f, 0.0f, 0.0f, 1.0f   } }, //position
            { { 0.0f,-0.4f,-0.6f, 0.0f   } }, //spotdirection, spotexponent
        };
 
    directional_light_ =
        {
            { { 0.5f,-1.0f, 0.1f, 0.0f  } }, //position
            { { 0.0f, 0.0f, 0.0f, 1.0f  } }, //spotdirection, spotexponent
        };
 
    // clang-format on
 
    // Setup uniforms.
    color_[0] = color_[1] = color_[2] = color_[3] = 1.0f;
    uniforms_.setPtrs(&point_light_,
                      color_,
                      light_mtx_,
                      &shadow_map_mtx_[ShadowMapRenderTargets::First][0],
                      &shadow_map_mtx_[ShadowMapRenderTargets::Second][0],
                      &shadow_map_mtx_[ShadowMapRenderTargets::Third][0],
                      &shadow_map_mtx_[ShadowMapRenderTargets::Fourth][0]);
    uniforms_.submitConstUniforms();
 
    // clang-format off
    // Settings.
    ShadowMapSettings smSettings[LightType::Count][DepthImpl::Count][SmImpl::Count] =
    {
        { //LightType::Spot
 
            { //DepthImpl::InvZ
 
                { //SmImpl::Hard
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0035f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.0012f, 0.0f, 0.05f, 0.00001f   // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 500.0f, 1.0f, 1000.0f, 1.0f      // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::PCF
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.007f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 500.0f, 1.0f, 1000.0f, 1.0f      // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::PCSS
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.007f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 500.0f, 1.0f, 1000.0f, 1.0f      // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::VSM
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 8.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.045f, 0.0f, 0.1f, 0.00001f     // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.02f, 0.0f, 0.04f, 0.00001f     // m_customParam0
                    , 450.0f, 1.0f, 1000.0f, 1.0f      // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::VSM].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::VSM].get() //m_progPackSkinned
                },
                { //SmImpl::ESM
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 3.0f, 1.0f, 10.0f, 0.01f         // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.02f, 0.0f, 0.3f, 0.00001f      // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 9000.0f, 1.0f, 15000.0f, 1.0f    // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                }
 
            },
            { //DepthImpl::Linear
 
                { //SmImpl::Hard
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0025f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.0012f, 0.0f, 0.05f, 0.00001f   // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 500.0f, 1.0f, 1000.0f, 1.0f      // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::PCF
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0025f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.05f,  0.00001f   // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 2000.0f, 1.0f, 2000.0f, 1.0f     // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::PCSS
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0025f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.05f,  0.00001f   // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 2000.0f, 1.0f, 2000.0f, 1.0f     // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::VSM
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.006f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.02f, 0.0f, 0.1f, 0.00001f      // m_customParam0
                    , 300.0f, 1.0f, 1500.0f, 1.0f      // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::VSM].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::VSM].get() //m_packDepthSkinned
                },
                { //SmImpl::ESM
                    10.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 0.01f         // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0055f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 2500.0f, 1.0f, 5000.0f, 1.0f     // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_packDepthSkinned
                }
 
            }
 
        },
        { //LightType::Point
 
            { //DepthImpl::InvZ
 
                { //SmImpl::Hard
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.006f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 50.0f, 1.0f, 300.0f, 1.0f        // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_xOffset
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::PCF
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.004f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 50.0f, 1.0f, 300.0f, 1.0f        // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.001f         // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.001f         // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::PCSS
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.004f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 50.0f, 1.0f, 300.0f, 1.0f        // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.001f         // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.001f         // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::VSM
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 8.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.055f, 0.0f, 0.1f, 0.00001f     // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.02f, 0.0f, 0.04f, 0.00001f     // m_customParam0
                    , 450.0f, 1.0f, 900.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_xOffset
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::VSM].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::VSM].get() //m_packDepthSkinned
                },
                { //SmImpl::ESM
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 10.0f, 1.0f, 20.0f, 1.0f         // m_depthValuePow
                    , 3.0f, 1.0f, 10.0f, 0.01f         // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.035f, 0.0f, 0.1f, 0.00001f     // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 9000.0f, 1.0f, 15000.0f, 1.0f    // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_xOffset
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                }
 
            },
            { //DepthImpl::Linear
 
                { //SmImpl::Hard
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.003f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 120.0f, 1.0f, 300.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_xOffset
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::PCF
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0035f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 120.0f, 1.0f, 300.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.001f         // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.001f         // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::PCSS
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0035f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 120.0f, 1.0f, 300.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.001f         // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.001f         // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::VSM
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.006f, 0.0f, 0.1f, 0.00001f     // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.02f, 0.0f, 0.1f, 0.00001f      // m_customParam0
                    , 400.0f, 1.0f, 900.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_xOffset
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::VSM].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::VSM].get() //m_packDepthSkinned
                },
                { //SmImpl::ESM
                    12.0f, 9.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 0.01f         // m_near
                    , 250.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.007f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.05f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 8000.0f, 1.0f, 15000.0f, 1.0f    // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_xOffset
                    , 0.25f, 0.0f, 2.0f, 0.001f        // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_packDepthSkinned
                }
 
            }
 
        },
        { //LightType::Directional
 
            { //DepthImpl::InvZ
 
                { //SmImpl::Hard
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0012f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 200.0f, 1.0f, 400.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_xOffset
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::PCF
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0012f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 200.0f, 1.0f, 400.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::PCSS
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0012f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 200.0f, 1.0f, 400.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::VSM
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.004f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.02f, 0.0f, 0.04f, 0.00001f     // m_customParam0
                    , 2500.0f, 1.0f, 5000.0f, 1.0f     // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_xOffset
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::VSM].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::VSM].get() //m_packDepthSkinned
                },
                { //SmImpl::ESM
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 0.01f         // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.004f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 9500.0f, 1.0f, 15000.0f, 1.0f    // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_xOffset
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::InvZ][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA].get() //m_packDepthSkinned
                }
 
            },
            { //DepthImpl::Linear
 
                { //SmImpl::Hard
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0012f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 500.0f, 1.0f, 1000.0f, 1.0f      // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_xOffset
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_packDepthSkinned
                },
                { //SmImpl::PCF
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0012f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 200.0f, 1.0f, 400.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::PCSS
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 99.0f, 1.0f          // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.0012f, 0.0f, 0.01f, 0.00001f   // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 200.0f, 1.0f, 400.0f, 1.0f       // m_customParam1
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 8.0f, 1.0f           // m_yNum
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_xOffset
                    , 1.0f, 0.0f, 3.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPackSkinned
                },
                { //SmImpl::VSM
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 1.0f          // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.004f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.02f, 0.0f, 0.04f, 0.00001f     // m_customParam0
                    , 2500.0f, 1.0f, 5000.0f, 1.0f     // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_xOffset
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::VSM].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::VSM].get() //m_packDepthSkinned
                },
                { //SmImpl::ESM
                    11.0f, 7.0f, 12.0f, 1.0f         // m_sizePwrTwo
                    , 1.0f, 1.0f, 20.0f, 1.0f          // m_depthValuePow
                    , 1.0f, 1.0f, 10.0f, 0.01f         // m_near
                    , 550.0f, 100.0f, 2000.0f, 50.0f   // m_far
                    , 0.004f, 0.0f, 0.01f, 0.00001f    // m_bias
                    , 0.001f, 0.0f, 0.04f, 0.00001f    // m_normalOffset
                    , 0.7f, 0.0f, 1.0f, 0.01f          // m_customParam0
                    , 9500.0f, 1.0f, 15000.0f, 1.0f    // m_customParam1
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_xNum
                    , 2.0f, 0.0f, 4.0f, 1.0f           // m_yNum
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_xOffset
                    , 0.2f, 0.0f, 1.0f, 0.01f          // m_yOffset
                    , true                             // m_doBlur
                    , programs_.m_packDepth[DepthImpl::Linear][PackDepth::RGBA].get() //m_progPack
                    , programs_.m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA].get() //m_packDepthSkinned
                }
 
            }
        }
    };
    // clang-format on
    bx::memCopy(sm_settings_, smSettings, sizeof(smSettings));
 
    settings_.m_lightType = LightType::SpotLight;
    settings_.m_depthImpl = DepthImpl::InvZ;
    settings_.m_smImpl = SmImpl::Hard;
    settings_.m_spotOuterAngle = 45.0f;
    settings_.m_spotInnerAngle = 30.0f;
    settings_.m_fovXAdjust = 0.0f;
    settings_.m_fovYAdjust = 0.0f;
    settings_.m_coverageSpotL = 90.0f;
    settings_.m_splitDistribution = 0.6f;
    settings_.m_numSplits = 4;
    settings_.m_updateLights = true;
    settings_.m_updateScene = true;
    settings_.m_drawDepthBuffer = false;
    settings_.m_showSmCoverage = false;
    settings_.m_stencilPack = true;
    settings_.m_stabilize = true;
}
 
auto shadowmap_generator::get_depth_type() const -> PackDepth::Enum
{
    PackDepth::Enum depthType = (SmImpl::VSM == settings_.m_smImpl) ? PackDepth::VSM : PackDepth::RGBA;
    return depthType;
}
 
auto shadowmap_generator::get_rt_texture(uint8_t split) const -> bgfx::TextureHandle
{
    if(!bgfx::isValid(rt_shadow_map_[split]))
    {
        return {bgfx::kInvalidHandle};
    }
 
    return bgfx::getTexture(rt_shadow_map_[split]);
}
 
auto shadowmap_generator::get_depth_render_program(PackDepth::Enum depth) const -> gpu_program::ptr
{
    return programs_.m_drawDepth[depth];
}
 
void shadowmap_generator::submit_uniforms(uint8_t stage) const
{
    if(!bgfx::isValid(tex_color_))
    {
        return;
    }
    uniforms_.submitPerFrameUniforms();
    uniforms_.submitPerDrawUniforms();
 
    for(uint8_t ii = 0; ii < ShadowMapRenderTargets::Count; ++ii)
    {
        if(!bgfx::isValid(rt_shadow_map_[ii]))
        {
            continue;
        }
 
        bgfx::setTexture(stage + ii, shadow_map_[ii], bgfx::getTexture(rt_shadow_map_[ii]));
    }
}
 
auto shadowmap_generator::already_updated() const -> bool
{
    return last_update_ == gfx::get_render_frame();
}
 
void shadowmap_generator::update(const camera& cam, const light& l, const math::transform& ltrans, bool is_active)
{
    last_update_ = gfx::get_render_frame();
 
    if(!l.casts_shadows)
    {
        deinit_textures();
        return;
    }
 
    bool recreateTextures = false;
    recreateTextures |= !valid_;
 
    valid_ = true;
 
    const auto& pos = ltrans.get_position();
    const auto& dir = ltrans.z_unit_axis();
    point_light_.m_position.m_x = pos.x;
    point_light_.m_position.m_y = pos.y;
    point_light_.m_position.m_z = pos.z;
 
    point_light_.m_spotDirectionInner.m_x = dir.x;
    point_light_.m_spotDirectionInner.m_y = dir.y;
    point_light_.m_spotDirectionInner.m_z = dir.z;
 
    directional_light_.m_position.m_x = dir.x;
    directional_light_.m_position.m_y = dir.y;
    directional_light_.m_position.m_z = dir.z;
 
    auto last_settings = settings_;
 
    settings_.m_lightType = convert(l.type);
    settings_.m_smImpl = convert(l.shadow_params.type);
    settings_.m_depthImpl = convert(l.shadow_params.depth);
 
    settings_.m_showSmCoverage = l.shadow_params.show_coverage;
 
    switch(l.type)
    {
        case light_type::spot:
            settings_.m_spotOuterAngle = l.spot_data.get_outer_angle();
            settings_.m_spotInnerAngle = l.spot_data.get_inner_angle();
            settings_.m_coverageSpotL = settings_.m_spotOuterAngle;
            break;
        case light_type::point:
            settings_.m_stencilPack = l.point_shadow_params.stencil_pack;
            settings_.m_fovXAdjust = l.point_shadow_params.fov_x_adjust;
            settings_.m_fovYAdjust = l.point_shadow_params.fov_y_adjust;
 
            break;
        default:
            settings_.m_splitDistribution = l.directional_shadow_params.split_distribution;
            settings_.m_numSplits = l.directional_shadow_params.num_splits;
            settings_.m_stabilize = l.directional_shadow_params.stabilize;
 
            break;
    }
 
#define SET_CLAMPED_VAL(x, val) x = val // math::clamp(val, x##Min, x##Max)
 
    ShadowMapSettings* currentSmSettings =
        &sm_settings_[settings_.m_lightType][settings_.m_depthImpl][settings_.m_smImpl];
 
    SET_CLAMPED_VAL(currentSmSettings->m_sizePwrTwo, convert(l.shadow_params.resolution));
    SET_CLAMPED_VAL(currentSmSettings->m_near, l.shadow_params.near_plane);
    SET_CLAMPED_VAL(currentSmSettings->m_bias, l.shadow_params.bias);
    SET_CLAMPED_VAL(currentSmSettings->m_normalOffset, l.shadow_params.normal_bias);
 
    // currentSmSettings->m_doBlur = l.shadow_params.impl.do_blur;
    // SET_VAL(currentSmSettings->m_xNum, l.shadow_params.impl.blur_x_num);
    // SET_VAL(currentSmSettings->m_yNum, l.shadow_params.impl.blur_y_num);
    // SET_VAL(currentSmSettings->m_xOffset, l.shadow_params.impl.blur_x_offset);
    // SET_VAL(currentSmSettings->m_yOffset, l.shadow_params.impl.blur_y_offset);
    // SET_VAL(currentSmSettings->m_customParam0, l.shadow_params.impl.hardness);
    // SET_VAL(currentSmSettings->m_customParam1, l.shadow_params.impl.depth_multiplier);
 
    switch(l.type)
    {
        case light_type::spot:
            SET_CLAMPED_VAL(currentSmSettings->m_far, l.spot_data.range);
            break;
        case light_type::point:
            SET_CLAMPED_VAL(currentSmSettings->m_far, l.point_data.range);
            break;
        default:
            SET_CLAMPED_VAL(currentSmSettings->m_far, l.shadow_params.far_plane);
            break;
    }
 
    if(LightType::SpotLight == settings_.m_lightType)
    {
        point_light_.m_spotDirectionInner.m_inner = settings_.m_spotInnerAngle;
    }
 
    // Update render target size.
    uint16_t shadowMapSize = 1 << uint32_t(currentSmSettings->m_sizePwrTwo);
    recreateTextures |= current_shadow_map_size_ != shadowMapSize;
    recreateTextures |= last_settings.m_smImpl != settings_.m_smImpl;
    recreateTextures |= last_settings.m_numSplits != settings_.m_numSplits;
    recreateTextures |= last_settings.m_lightType != settings_.m_lightType;
 
    if(recreateTextures)
    {
        current_shadow_map_size_ = shadowMapSize;
 
        if(bgfx::isValid(rt_shadow_map_[0]))
        {
            bgfx::destroy(rt_shadow_map_[0]);
            rt_shadow_map_[0] = {bgfx::kInvalidHandle};
        }
 
        {
            bgfx::TextureHandle fbtextures[] = {
                bgfx::createTexture2D(current_shadow_map_size_,
                                      current_shadow_map_size_,
                                      false,
                                      1,
                                      bgfx::TextureFormat::BGRA8,
                                      BGFX_TEXTURE_RT),
                bgfx::createTexture2D(current_shadow_map_size_,
                                      current_shadow_map_size_,
                                      false,
                                      1,
                                      bgfx::TextureFormat::D24S8,
                                      BGFX_TEXTURE_RT),
            };
            rt_shadow_map_[0] = bgfx::createFrameBuffer(BX_COUNTOF(fbtextures), fbtextures, true);
        }
 
        // if(LightType::DirectionalLight == settings_.m_lightType)
        {
            for(uint8_t ii = 1; ii < ShadowMapRenderTargets::Count; ++ii)
            {
                if(bgfx::isValid(rt_shadow_map_[ii]))
                {
                    bgfx::destroy(rt_shadow_map_[ii]);
                    rt_shadow_map_[ii] = {bgfx::kInvalidHandle};
                }
 
                if(ii < settings_.m_numSplits)
                {
                    bgfx::TextureHandle fbtextures[] = {
                        bgfx::createTexture2D(current_shadow_map_size_,
                                              current_shadow_map_size_,
                                              false,
                                              1,
                                              bgfx::TextureFormat::BGRA8,
                                              BGFX_TEXTURE_RT),
                        bgfx::createTexture2D(current_shadow_map_size_,
                                              current_shadow_map_size_,
                                              false,
                                              1,
                                              bgfx::TextureFormat::D24S8,
                                              BGFX_TEXTURE_RT),
                    };
                    rt_shadow_map_[ii] = bgfx::createFrameBuffer(BX_COUNTOF(fbtextures), fbtextures, true);
                }
            }
        }
 
        if(bgfx::isValid(rt_blur_))
        {
            bgfx::destroy(rt_blur_);
            rt_blur_ = {bgfx::kInvalidHandle};
        }
 
        bool bVsmOrEsm = (SmImpl::VSM == settings_.m_smImpl) || (SmImpl::ESM == settings_.m_smImpl);
 
        // Blur shadow map.
        if(bVsmOrEsm && currentSmSettings->m_doBlur)
        {
            rt_blur_ = bgfx::createFrameBuffer(current_shadow_map_size_, current_shadow_map_size_, bgfx::TextureFormat::BGRA8);
        }
    }
 
    float currentShadowMapSizef = float(int16_t(current_shadow_map_size_));
 
    // Update uniforms.
 
    uniforms_.m_shadowMapTexelSize = 1.0f / currentShadowMapSizef;
    uniforms_.m_shadowMapBias = currentSmSettings->m_bias;
    uniforms_.m_shadowMapOffset = currentSmSettings->m_normalOffset;
    uniforms_.m_shadowMapParam0 = currentSmSettings->m_customParam0;
    uniforms_.m_shadowMapParam1 = currentSmSettings->m_customParam1;
    uniforms_.m_depthValuePow = currentSmSettings->m_depthValuePow;
    uniforms_.m_XNum = currentSmSettings->m_xNum;
    uniforms_.m_YNum = currentSmSettings->m_yNum;
    uniforms_.m_XOffset = currentSmSettings->m_xOffset;
    uniforms_.m_YOffset = currentSmSettings->m_yOffset;
    uniforms_.m_showSmCoverage = float(settings_.m_showSmCoverage);
    uniforms_.m_lightPtr = (LightType::DirectionalLight == settings_.m_lightType) ? &directional_light_ : &point_light_;
 
    bool homogeneousDepth = gfx::is_homogeneous_depth();
    bool originBottomLeft = gfx::is_origin_bottom_left();
 
    // Compute transform matrices.
    auto& lightView = light_view_;
    auto& lightProj = light_proj_;
    auto& lightFrustums = light_frustums_;
 
    float mtxYpr[TetrahedronFaces::Count][16];
 
    if(LightType::SpotLight == settings_.m_lightType)
    {
        const float fovy = settings_.m_coverageSpotL;
        const float aspect = 1.0f;
        bx::mtxProj(lightProj[ProjType::Horizontal],
                    fovy,
                    aspect,
                    currentSmSettings->m_near,
                    currentSmSettings->m_far,
                    false);
 
        // For linear depth, prevent depth division by variable w-component in shaders and divide here by far plane
        if(DepthImpl::Linear == settings_.m_depthImpl)
        {
            lightProj[ProjType::Horizontal][10] /= currentSmSettings->m_far;
            lightProj[ProjType::Horizontal][14] /= currentSmSettings->m_far;
        }
 
        const bx::Vec3 at = bx::add(bx::load<bx::Vec3>(point_light_.m_position.m_v),
                                    bx::load<bx::Vec3>(point_light_.m_spotDirectionInner.m_v));
        bx::mtxLookAt(lightView[TetrahedronFaces::Green], bx::load<bx::Vec3>(point_light_.m_position.m_v), at);
    }
    else if(LightType::PointLight == settings_.m_lightType)
    {
        float ypr[TetrahedronFaces::Count][3] = {
            {bx::toRad(0.0f), bx::toRad(27.36780516f), bx::toRad(0.0f)},
            {bx::toRad(180.0f), bx::toRad(27.36780516f), bx::toRad(0.0f)},
            {bx::toRad(-90.0f), bx::toRad(-27.36780516f), bx::toRad(0.0f)},
            {bx::toRad(90.0f), bx::toRad(-27.36780516f), bx::toRad(0.0f)},
        };
 
        if(settings_.m_stencilPack)
        {
            const float fovx = 143.98570868f + 3.51f + settings_.m_fovXAdjust;
            const float fovy = 125.26438968f + 9.85f + settings_.m_fovYAdjust;
            const float aspect = bx::tan(bx::toRad(fovx * 0.5f)) / bx::tan(bx::toRad(fovy * 0.5f));
 
            bx::mtxProj(lightProj[ProjType::Vertical],
                        fovx,
                        aspect,
                        currentSmSettings->m_near,
                        currentSmSettings->m_far,
                        false);
 
            // For linear depth, prevent depth division by variable w-component in shaders and divide here by far plane
            if(DepthImpl::Linear == settings_.m_depthImpl)
            {
                lightProj[ProjType::Vertical][10] /= currentSmSettings->m_far;
                lightProj[ProjType::Vertical][14] /= currentSmSettings->m_far;
            }
 
            ypr[TetrahedronFaces::Green][2] = bx::toRad(180.0f);
            ypr[TetrahedronFaces::Yellow][2] = bx::toRad(0.0f);
            ypr[TetrahedronFaces::Blue][2] = bx::toRad(90.0f);
            ypr[TetrahedronFaces::Red][2] = bx::toRad(-90.0f);
        }
 
        const float fovx = 143.98570868f + 7.8f + settings_.m_fovXAdjust;
        const float fovy = 125.26438968f + 3.0f + settings_.m_fovYAdjust;
        const float aspect = bx::tan(bx::toRad(fovx * 0.5f)) / bx::tan(bx::toRad(fovy * 0.5f));
 
        bx::mtxProj(lightProj[ProjType::Horizontal],
                    fovy,
                    aspect,
                    currentSmSettings->m_near,
                    currentSmSettings->m_far,
                    homogeneousDepth);
 
        // For linear depth, prevent depth division by variable w component in shaders and divide here by far plane
        if(DepthImpl::Linear == settings_.m_depthImpl)
        {
            lightProj[ProjType::Horizontal][10] /= currentSmSettings->m_far;
            lightProj[ProjType::Horizontal][14] /= currentSmSettings->m_far;
        }
 
        for(uint8_t ii = 0; ii < TetrahedronFaces::Count; ++ii)
        {
            float mtxTmp[16];
            mtxYawPitchRoll(mtxTmp, ypr[ii][0], ypr[ii][1], ypr[ii][2]);
 
            float tmp[3] = {
                -bx::dot(bx::load<bx::Vec3>(point_light_.m_position.m_v), bx::load<bx::Vec3>(&mtxTmp[0])),
                -bx::dot(bx::load<bx::Vec3>(point_light_.m_position.m_v), bx::load<bx::Vec3>(&mtxTmp[4])),
                -bx::dot(bx::load<bx::Vec3>(point_light_.m_position.m_v), bx::load<bx::Vec3>(&mtxTmp[8])),
            };
 
            bx::mtxTranspose(mtxYpr[ii], mtxTmp);
 
            bx::memCopy(lightView[ii], mtxYpr[ii], 12 * sizeof(float));
            lightView[ii][12] = tmp[0];
            lightView[ii][13] = tmp[1];
            lightView[ii][14] = tmp[2];
            lightView[ii][15] = 1.0f;
        }
    }
    else // LightType::DirectionalLight == m_settings.m_lightType
    {
        // Setup light view matrix to look at the camera position
        // Get camera position from the view inverse matrix
        const auto camera_pos = cam.get_position();
        const float camera_pos_x = camera_pos.x;
        const float camera_pos_y = camera_pos.y;
        const float camera_pos_z = camera_pos.z;
        
        // Create eye position by offsetting from camera position using light direction
        const bx::Vec3 eye = {
            camera_pos_x - directional_light_.m_position.m_x,
            camera_pos_y - directional_light_.m_position.m_y,
            camera_pos_z - directional_light_.m_position.m_z,
        };
 
        
        // Look at the camera position
        const bx::Vec3 at = {camera_pos_x, camera_pos_y, camera_pos_z};
        bx::mtxLookAt(lightView[0], eye, at);
 
        // Compute split distances.
        const uint8_t maxNumSplits = 4;
        BX_ASSERT(maxNumSplits >= settings_.m_numSplits, "Error! Max num splits.");
 
        // Split distances
 
        std::array<float, maxNumSplits * 2> splitSlices; //[maxNumSplits * 2];
        splitFrustum(splitSlices.data(),
                     uint8_t(settings_.m_numSplits),
                     currentSmSettings->m_near,
                     currentSmSettings->m_far,
                     settings_.m_splitDistribution);
 
        // Create initial orthographic projection with fixed size
        // The actual size will be adjusted by the crop matrix based on frustum bounds
        float mtxProj[16];
        bx::mtxOrtho(mtxProj,
                     /*left*/ -1.0f,
                     /*right*/ +1.0f,
                     /*bottom*/ -1.0f,
                     /*top*/ +1.0f,
                     -currentSmSettings->m_far,
                     currentSmSettings->m_far,
                     0.0f,
                     homogeneousDepth);
 
        // Update uniforms.
        for(uint8_t ii = 0, ff = 1; ii < settings_.m_numSplits; ++ii, ff += 2)
        {
            // This lags for 1 frame, but it's not a problem.
            uniforms_.m_csmFarDistances[ii] = splitSlices[ff];
        }
 
        // Compute camera inverse view mtx.
 
        const auto& mtxViewInv = cam.get_view_inverse();
 
        const uint8_t numCorners = 8;
        float frustumCorners[maxNumSplits][numCorners][3];
        for(uint8_t ii = 0, nn = 0, ff = 1; ii < settings_.m_numSplits; ++ii, nn += 2, ff += 2)
        {
            bx::Vec3 min = {9000.0f, 9000.0f, 9000.0f};
            bx::Vec3 max = {-9000.0f, -9000.0f, -9000.0f};
 
            float frustum_radius = 0.0f;
 
            // if(cam)
            {
                const float camFovy = cam.get_fov();
                const float camAspect = cam.get_aspect_ratio();
                const float projHeight = bx::tan(bx::toRad(camFovy) * 0.5f);
                const float projWidth = projHeight * camAspect;
 
                // Compute frustum corners for one split in world space.
                // Use configurable method for frustum calculation  
                compute_world_space_frustum_corners((float*)frustumCorners[ii],
                                                               splitSlices[nn],
                                                               splitSlices[ff],
                                                               projWidth,
                                                               projHeight,
                                                               mtxViewInv,
                                                               frustum_method_,
                                                               adaptive_params_);
 
                // Calculate frustum center in world space first
                bx::Vec3 frustumCenter = {0.0f, 0.0f, 0.0f};
                for(uint8_t jj = 0; jj < numCorners; ++jj)
                {
                    frustumCenter.x += frustumCorners[ii][jj][0];
                    frustumCenter.y += frustumCorners[ii][jj][1];
                    frustumCenter.z += frustumCorners[ii][jj][2];
                }
                
                // Average to get center
                frustumCenter.x /= numCorners;
                frustumCenter.y /= numCorners;
                frustumCenter.z /= numCorners;
                
                // Transform center to light space
                const bx::Vec3 lightSpaceCenter = bx::mul(frustumCenter, lightView[0]);
                
                // Calculate radius and transform corners to light space
                for(uint8_t jj = 0; jj < numCorners; ++jj)
                {
                    // Transform to light space
                    const bx::Vec3 xyz = bx::mul(bx::load<bx::Vec3>(frustumCorners[ii][jj]), lightView[0]);
                    
                    // Calculate distance from center
                    const float dx = xyz.x - lightSpaceCenter.x;
                    const float dy = xyz.y - lightSpaceCenter.y;
                    const float dz = xyz.z - lightSpaceCenter.z;
                    const float distance = bx::sqrt(dx*dx + dy*dy + dz*dz);
                    frustum_radius = bx::max(frustum_radius, distance);
                    
                    // Update bounding box
                    min = bx::min(min, xyz);
                    max = bx::max(max, xyz);
                }
                
                // Round radius to reduce flickering (similar to the other engine)
                frustum_radius = bx::ceil(frustum_radius * 16.0f) / 16.0f;
            }
 
            // Option 1: Use min/max approach (your original approach)
            const bx::Vec3 minproj = bx::mulH(min, mtxProj);
            const bx::Vec3 maxproj = bx::mulH(max, mtxProj);
 
            // Option 2: Use radius-based approach (like the other engine)
            // We'll blend between both approaches for better stability
            
            // Calculate scales using min/max approach
            float scalex_minmax = 2.0f / (maxproj.x - minproj.x);
            float scaley_minmax = 2.0f / (maxproj.y - minproj.y);
            
            // Use the calculated frustum radius for a more stable approach
            float scalex_radius = 1.0f / frustum_radius;
            float scaley_radius = 1.0f / frustum_radius;
        
            // Blend between the two approaches (0.7 weight to radius approach)
            float scalex = bx::lerp(scalex_minmax, scalex_radius, 0.7f);
            float scaley = bx::lerp(scaley_minmax, scaley_radius, 0.7f);
 
            if(settings_.m_stabilize)
            {
                // Increase quantizer for better stability
                const float quantizer = 128.0f;
                scalex = quantizer / bx::ceil(quantizer / scalex);
                scaley = quantizer / bx::ceil(quantizer / scaley);
            }
 
            // Calculate center-based offset for better balance
            float offsetx = -1.0f - scalex * minproj.x;
            float offsety = -1.0f - scaley * minproj.y;
 
            // Apply texel snapping for stability (similar to the other engine's approach)
            if(settings_.m_stabilize)
            {
                float currentShadowMapSizef = float(int16_t(current_shadow_map_size_));
                const float halfSize = currentShadowMapSizef * 0.5f;
                
                // Calculate shadow origin in texel space
                float shadowOriginX = offsetx * halfSize;
                float shadowOriginY = offsety * halfSize;
                
                // Round to nearest texel
                shadowOriginX = bx::round(shadowOriginX);
                shadowOriginY = bx::round(shadowOriginY);
                
                // Convert back to normalized space
                offsetx = shadowOriginX / halfSize;
                offsety = shadowOriginY / halfSize;
            }
 
            float mtxCrop[16];
            bx::mtxIdentity(mtxCrop);
            mtxCrop[0] = scalex;   // x-scale
            mtxCrop[5] = scaley;   // y-scale
            mtxCrop[12] = offsetx; // x-offset
            mtxCrop[13] = offsety; // y-offset
 
            bx::mtxMul(lightProj[ii], mtxCrop, mtxProj);
        }
    }
 
    if(LightType::SpotLight == settings_.m_lightType)
    {
        lightFrustums[0].update(math::make_mat4(lightView[0]),
                                math::make_mat4(lightProj[ProjType::Horizontal]),
                                homogeneousDepth);
    }
    else if(LightType::PointLight == settings_.m_lightType)
    {
        lightFrustums[TetrahedronFaces::Green].update(math::make_mat4(lightView[TetrahedronFaces::Green]),
                                                      math::make_mat4(lightProj[ProjType::Horizontal]),
                                                      homogeneousDepth);
 
        lightFrustums[TetrahedronFaces::Yellow].update(math::make_mat4(lightView[TetrahedronFaces::Yellow]),
                                                       math::make_mat4(lightProj[ProjType::Horizontal]),
                                                       homogeneousDepth);
 
        if(settings_.m_stencilPack)
        {
            lightFrustums[TetrahedronFaces::Blue].update(math::make_mat4(lightView[TetrahedronFaces::Blue]),
                                                         math::make_mat4(lightProj[ProjType::Vertical]),
                                                         homogeneousDepth);
 
            lightFrustums[TetrahedronFaces::Red].update(math::make_mat4(lightView[TetrahedronFaces::Red]),
                                                        math::make_mat4(lightProj[ProjType::Vertical]),
                                                        homogeneousDepth);
        }
        else
        {
            lightFrustums[TetrahedronFaces::Blue].update(math::make_mat4(lightView[TetrahedronFaces::Blue]),
                                                         math::make_mat4(lightProj[ProjType::Horizontal]),
                                                         homogeneousDepth);
 
            lightFrustums[TetrahedronFaces::Red].update(math::make_mat4(lightView[TetrahedronFaces::Red]),
                                                        math::make_mat4(lightProj[ProjType::Horizontal]),
                                                        homogeneousDepth);
        }
    }
    else // LightType::DirectionalLight == settings.m_lightType
    {
        lightFrustums[0].update(math::make_mat4(lightView[0]), math::make_mat4(lightProj[0]), homogeneousDepth);
        lightFrustums[1].update(math::make_mat4(lightView[0]), math::make_mat4(lightProj[1]), homogeneousDepth);
        lightFrustums[2].update(math::make_mat4(lightView[0]), math::make_mat4(lightProj[2]), homogeneousDepth);
        lightFrustums[3].update(math::make_mat4(lightView[0]), math::make_mat4(lightProj[3]), homogeneousDepth);
    }
 
    // Prepare for scene.
    {
        // Setup shadow mtx.
        float mtxShadow[16];
 
        const float ymul = (originBottomLeft) ? 0.5f : -0.5f;
        float zadd = (DepthImpl::Linear == settings_.m_depthImpl) ? 0.0f : 0.5f;
 
        // clang-format off
        const float mtxBias[16] =
            {
                0.5f, 0.0f, 0.0f, 0.0f,
                0.0f, ymul, 0.0f, 0.0f,
                0.0f, 0.0f, 0.5f, 0.0f,
                0.5f, 0.5f, zadd, 1.0f,
            };
        // clang-format on
 
        if(LightType::SpotLight == settings_.m_lightType)
        {
            float mtxTmp[16];
            bx::mtxMul(mtxTmp, lightProj[ProjType::Horizontal], mtxBias);
            bx::mtxMul(mtxShadow, lightView[0], mtxTmp); // lightViewProjBias
        }
        else if(LightType::PointLight == settings_.m_lightType)
        {
            const float s = (originBottomLeft) ? 1.0f : -1.0f; // sign
            zadd = (DepthImpl::Linear == settings_.m_depthImpl) ? 0.0f : 0.5f;
 
            // clang-format off
            const float mtxCropBias[2][TetrahedronFaces::Count][16] =
                {
                    { // settings.m_stencilPack == false
 
                     { // D3D: Green, OGL: Blue
                      0.25f,    0.0f, 0.0f, 0.0f,
                      0.0f, s*0.25f, 0.0f, 0.0f,
                      0.0f,    0.0f, 0.5f, 0.0f,
                      0.25f,   0.25f, zadd, 1.0f,
                      },
                     { // D3D: Yellow, OGL: Red
                      0.25f,    0.0f, 0.0f, 0.0f,
                      0.0f, s*0.25f, 0.0f, 0.0f,
                      0.0f,    0.0f, 0.5f, 0.0f,
                      0.75f,   0.25f, zadd, 1.0f,
                      },
                     { // D3D: Blue, OGL: Green
                      0.25f,    0.0f, 0.0f, 0.0f,
                      0.0f, s*0.25f, 0.0f, 0.0f,
                      0.0f,    0.0f, 0.5f, 0.0f,
                      0.25f,   0.75f, zadd, 1.0f,
                      },
                     { // D3D: Red, OGL: Yellow
                         0.25f,    0.0f, 0.0f, 0.0f,
                         0.0f, s*0.25f, 0.0f, 0.0f,
                         0.0f,    0.0f, 0.5f, 0.0f,
                         0.75f,   0.75f, zadd, 1.0f,
                         },
                     },
                    { // settings.m_stencilPack == true
 
                     { // D3D: Red, OGL: Blue
                      0.25f,   0.0f, 0.0f, 0.0f,
                      0.0f, s*0.5f, 0.0f, 0.0f,
                      0.0f,   0.0f, 0.5f, 0.0f,
                      0.25f,   0.5f, zadd, 1.0f,
                      },
                     { // D3D: Blue, OGL: Red
                      0.25f,   0.0f, 0.0f, 0.0f,
                      0.0f, s*0.5f, 0.0f, 0.0f,
                      0.0f,   0.0f, 0.5f, 0.0f,
                      0.75f,   0.5f, zadd, 1.0f,
                      },
                     { // D3D: Green, OGL: Green
                      0.5f,    0.0f, 0.0f, 0.0f,
                      0.0f, s*0.25f, 0.0f, 0.0f,
                      0.0f,    0.0f, 0.5f, 0.0f,
                      0.5f,   0.75f, zadd, 1.0f,
                      },
                     { // D3D: Yellow, OGL: Yellow
                         0.5f,    0.0f, 0.0f, 0.0f,
                         0.0f, s*0.25f, 0.0f, 0.0f,
                         0.0f,    0.0f, 0.5f, 0.0f,
                         0.5f,   0.25f, zadd, 1.0f,
                         },
                     }
                };
            // clang-format on
 
            // clang-format off
                   // Use as: [stencilPack][flipV][tetrahedronFace]
            static const uint8_t cropBiasIndices[2][2][4] =
                {
                 { // settings.m_stencilPack == false
                     { 0, 1, 2, 3 }, //flipV == false
                     { 2, 3, 0, 1 }, //flipV == true
                 },
                 { // settings.m_stencilPack == true
                     { 3, 2, 0, 1 }, //flipV == false
                     { 2, 3, 0, 1 }, //flipV == true
                 },
                 };
            // clang-format on
 
            for(uint8_t ii = 0; ii < TetrahedronFaces::Count; ++ii)
            {
                ProjType::Enum projType = (settings_.m_stencilPack) ? ProjType::Enum(ii > 1) : ProjType::Horizontal;
                uint8_t biasIndex = cropBiasIndices[settings_.m_stencilPack][uint8_t(originBottomLeft)][ii];
 
                float mtxTmp[16];
                bx::mtxMul(mtxTmp, mtxYpr[ii], lightProj[projType]);
                bx::mtxMul(shadow_map_mtx_[ii],
                           mtxTmp,
                           mtxCropBias[settings_.m_stencilPack][biasIndex]); // mtxYprProjBias
            }
 
            bx::mtxTranslate(mtxShadow // lightInvTranslate
                             ,
                             -point_light_.m_position.m_v[0],
                             -point_light_.m_position.m_v[1],
                             -point_light_.m_position.m_v[2]);
        }
        else // LightType::DirectionalLight == settings.m_lightType
        {
            for(uint8_t ii = 0; ii < settings_.m_numSplits; ++ii)
            {
                float mtxTmp[16];
 
                bx::mtxMul(mtxTmp, lightProj[ii], mtxBias);
                bx::mtxMul(shadow_map_mtx_[ii], lightView[0], mtxTmp); // lViewProjCropBias
            }
        }
 
        if(LightType::DirectionalLight != settings_.m_lightType)
        {
            float tmp[16];
            bx::mtxIdentity(tmp);
 
            bx::mtxMul(light_mtx_, tmp, mtxShadow);
        }
    }
}
 
void shadowmap_generator::generate_shadowmaps(const shadow_map_models_t& models)
{
    auto& lightView = light_view_;
    auto& lightProj = light_proj_;
    auto& lightFrustums = light_frustums_;
 
    bool homogeneousDepth = gfx::is_homogeneous_depth();
    bool originBottomLeft = gfx::is_origin_bottom_left();
 
    float screenProj[16];
    float screenView[16];
    bx::mtxIdentity(screenView);
 
    bx::mtxOrtho(screenProj, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 100.0f, 0.0f, homogeneousDepth);
 
    gfx::render_pass shadowmap_pass_0("shadowmap_pass_0");
    gfx::render_pass shadowmap_pass_1("shadowmap_pass_1");
    gfx::render_pass shadowmap_pass_2("shadowmap_pass_2");
    gfx::render_pass shadowmap_pass_3("shadowmap_pass_3");
    gfx::render_pass shadowmap_pass_4("shadowmap_pass_4");
    gfx::render_pass shadowmap_vblur_pass_0("shadowmap_vblur_pass_0");
    gfx::render_pass shadowmap_hblur_pass_0("shadowmap_hblur_pass_0");
    gfx::render_pass shadowmap_vblur_pass_1("shadowmap_hblur_pass_1");
    gfx::render_pass shadowmap_hblur_pass_1("shadowmap_hblur_pass_1");
    gfx::render_pass shadowmap_vblur_pass_2("shadowmap_vblur_pass_2");
    gfx::render_pass shadowmap_hblur_pass_2("shadowmap_hblur_pass_2");
    gfx::render_pass shadowmap_vblur_pass_3("shadowmap_vblur_pass_3");
    gfx::render_pass shadowmap_hblur_pass_3("shadowmap_hblur_pass_3");
 
    auto RENDERVIEW_SHADOWMAP_0_ID = shadowmap_pass_0.id;
    auto RENDERVIEW_SHADOWMAP_1_ID = shadowmap_pass_1.id;
    auto RENDERVIEW_SHADOWMAP_2_ID = shadowmap_pass_2.id;
    auto RENDERVIEW_SHADOWMAP_3_ID = shadowmap_pass_3.id;
    auto RENDERVIEW_SHADOWMAP_4_ID = shadowmap_pass_4.id;
    auto RENDERVIEW_VBLUR_0_ID = shadowmap_vblur_pass_0.id;
    auto RENDERVIEW_HBLUR_0_ID = shadowmap_hblur_pass_0.id;
    auto RENDERVIEW_VBLUR_1_ID = shadowmap_vblur_pass_1.id;
    auto RENDERVIEW_HBLUR_1_ID = shadowmap_hblur_pass_1.id;
    auto RENDERVIEW_VBLUR_2_ID = shadowmap_vblur_pass_2.id;
    auto RENDERVIEW_HBLUR_2_ID = shadowmap_hblur_pass_2.id;
    auto RENDERVIEW_VBLUR_3_ID = shadowmap_vblur_pass_3.id;
    auto RENDERVIEW_HBLUR_3_ID = shadowmap_hblur_pass_3.id;
 
    if(LightType::SpotLight == settings_.m_lightType)
    {
        bgfx::setViewRect(RENDERVIEW_SHADOWMAP_0_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_SHADOWMAP_1_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_VBLUR_0_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_HBLUR_0_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
 
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_0_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_1_ID, lightView[0], lightProj[ProjType::Horizontal]);
        bgfx::setViewTransform(RENDERVIEW_VBLUR_0_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_HBLUR_0_ID, screenView, screenProj);
 
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_0_ID, rt_shadow_map_[0]);
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_1_ID, rt_shadow_map_[0]);
        bgfx::setViewFrameBuffer(RENDERVIEW_VBLUR_0_ID, rt_blur_);
        bgfx::setViewFrameBuffer(RENDERVIEW_HBLUR_0_ID, rt_shadow_map_[0]);
    }
    else if(LightType::PointLight == settings_.m_lightType)
    {
        bgfx::setViewRect(RENDERVIEW_SHADOWMAP_0_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        if(settings_.m_stencilPack)
        {
            const uint16_t f = current_shadow_map_size_;     // full size
            const uint16_t h = current_shadow_map_size_ / 2; // half size
            bgfx::setViewRect(RENDERVIEW_SHADOWMAP_1_ID, 0, 0, f, h);
            bgfx::setViewRect(RENDERVIEW_SHADOWMAP_2_ID, 0, h, f, h);
            bgfx::setViewRect(RENDERVIEW_SHADOWMAP_3_ID, 0, 0, h, f);
            bgfx::setViewRect(RENDERVIEW_SHADOWMAP_4_ID, h, 0, h, f);
        }
        else
        {
            const uint16_t h = current_shadow_map_size_ / 2; // half size
            bgfx::setViewRect(RENDERVIEW_SHADOWMAP_1_ID, 0, 0, h, h);
            bgfx::setViewRect(RENDERVIEW_SHADOWMAP_2_ID, h, 0, h, h);
            bgfx::setViewRect(RENDERVIEW_SHADOWMAP_3_ID, 0, h, h, h);
            bgfx::setViewRect(RENDERVIEW_SHADOWMAP_4_ID, h, h, h, h);
        }
        bgfx::setViewRect(RENDERVIEW_VBLUR_0_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_HBLUR_0_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
 
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_0_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_1_ID,
                               lightView[TetrahedronFaces::Green],
                               lightProj[ProjType::Horizontal]);
 
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_2_ID,
                               lightView[TetrahedronFaces::Yellow],
                               lightProj[ProjType::Horizontal]);
 
        if(settings_.m_stencilPack)
        {
            bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_3_ID,
                                   lightView[TetrahedronFaces::Blue],
                                   lightProj[ProjType::Vertical]);
 
            bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_4_ID,
                                   lightView[TetrahedronFaces::Red],
                                   lightProj[ProjType::Vertical]);
        }
        else
        {
            bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_3_ID,
                                   lightView[TetrahedronFaces::Blue],
                                   lightProj[ProjType::Horizontal]);
 
            bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_4_ID,
                                   lightView[TetrahedronFaces::Red],
                                   lightProj[ProjType::Horizontal]);
        }
        bgfx::setViewTransform(RENDERVIEW_VBLUR_0_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_HBLUR_0_ID, screenView, screenProj);
 
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_0_ID, rt_shadow_map_[0]);
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_1_ID, rt_shadow_map_[0]);
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_2_ID, rt_shadow_map_[0]);
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_3_ID, rt_shadow_map_[0]);
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_4_ID, rt_shadow_map_[0]);
        bgfx::setViewFrameBuffer(RENDERVIEW_VBLUR_0_ID, rt_blur_);
        bgfx::setViewFrameBuffer(RENDERVIEW_HBLUR_0_ID, rt_shadow_map_[0]);
    }
    else // LightType::DirectionalLight == settings.m_lightType
    {
        bgfx::setViewRect(RENDERVIEW_SHADOWMAP_1_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_SHADOWMAP_2_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_SHADOWMAP_3_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_SHADOWMAP_4_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_VBLUR_0_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_HBLUR_0_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_VBLUR_1_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_HBLUR_1_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_VBLUR_2_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_HBLUR_2_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_VBLUR_3_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
        bgfx::setViewRect(RENDERVIEW_HBLUR_3_ID, 0, 0, current_shadow_map_size_, current_shadow_map_size_);
 
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_1_ID, lightView[0], lightProj[0]);
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_2_ID, lightView[0], lightProj[1]);
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_3_ID, lightView[0], lightProj[2]);
        bgfx::setViewTransform(RENDERVIEW_SHADOWMAP_4_ID, lightView[0], lightProj[3]);
 
        bgfx::setViewTransform(RENDERVIEW_VBLUR_0_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_HBLUR_0_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_VBLUR_1_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_HBLUR_1_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_VBLUR_2_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_HBLUR_2_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_VBLUR_3_ID, screenView, screenProj);
        bgfx::setViewTransform(RENDERVIEW_HBLUR_3_ID, screenView, screenProj);
 
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_1_ID, rt_shadow_map_[0]);
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_2_ID, rt_shadow_map_[1]);
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_3_ID, rt_shadow_map_[2]);
        bgfx::setViewFrameBuffer(RENDERVIEW_SHADOWMAP_4_ID, rt_shadow_map_[3]);
        bgfx::setViewFrameBuffer(RENDERVIEW_VBLUR_0_ID, rt_blur_);          // vblur
        bgfx::setViewFrameBuffer(RENDERVIEW_HBLUR_0_ID, rt_shadow_map_[0]); // hblur
        bgfx::setViewFrameBuffer(RENDERVIEW_VBLUR_1_ID, rt_blur_);          // vblur
        bgfx::setViewFrameBuffer(RENDERVIEW_HBLUR_1_ID, rt_shadow_map_[1]); // hblur
        bgfx::setViewFrameBuffer(RENDERVIEW_VBLUR_2_ID, rt_blur_);          // vblur
        bgfx::setViewFrameBuffer(RENDERVIEW_HBLUR_2_ID, rt_shadow_map_[2]); // hblur
        bgfx::setViewFrameBuffer(RENDERVIEW_VBLUR_3_ID, rt_blur_);          // vblur
        bgfx::setViewFrameBuffer(RENDERVIEW_HBLUR_3_ID, rt_shadow_map_[3]); // hblur
    }
 
    // Clear shadowmap rendertarget at beginning.
    const uint8_t flags0 = (LightType::DirectionalLight == settings_.m_lightType)
                               ? 0
                               : BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH | BGFX_CLEAR_STENCIL;
 
    bgfx::setViewClear(RENDERVIEW_SHADOWMAP_0_ID,
                       flags0,
                       0xfefefefe // blur fails on completely white regions
                       ,
                       clear_values_.clear_depth,
                       clear_values_.clear_stencil);
    bgfx::touch(RENDERVIEW_SHADOWMAP_0_ID);
 
    const uint8_t flags1 =
        (LightType::DirectionalLight == settings_.m_lightType) ? BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH : 0;
 
    for(uint8_t ii = 0; ii < 4; ++ii)
    {
        bgfx::setViewClear(RENDERVIEW_SHADOWMAP_1_ID + ii,
                           flags1,
                           0xfefefefe // blur fails on completely white regions
                           ,
                           clear_values_.clear_depth,
                           clear_values_.clear_stencil);
        bgfx::touch(RENDERVIEW_SHADOWMAP_1_ID + ii);
    }
 
    // Render.
 
    ShadowMapSettings* currentSmSettings =
        &sm_settings_[settings_.m_lightType][settings_.m_depthImpl][settings_.m_smImpl];
 
    uniforms_.submitPerFrameUniforms();
 
    bool anythingDrawn = false;
    // Craft shadow map.
    {
        // Craft stencil mask for point light shadow map packing.
        if(LightType::PointLight == settings_.m_lightType && settings_.m_stencilPack)
        {
            if(6 == bgfx::getAvailTransientVertexBuffer(6, PosVertex::get_layout()))
            {
                bgfx::TransientVertexBuffer vb;
                bgfx::allocTransientVertexBuffer(&vb, 6, PosVertex::get_layout());
                PosVertex* vertex = (PosVertex*)vb.data;
 
                const float min = 0.0f;
                const float max = 1.0f;
                const float center = 0.5f;
                const float zz = 0.0f;
 
                vertex[0].m_x = min;
                vertex[0].m_y = min;
                vertex[0].m_z = zz;
 
                vertex[1].m_x = max;
                vertex[1].m_y = min;
                vertex[1].m_z = zz;
 
                vertex[2].m_x = center;
                vertex[2].m_y = center;
                vertex[2].m_z = zz;
 
                vertex[3].m_x = center;
                vertex[3].m_y = center;
                vertex[3].m_z = zz;
 
                vertex[4].m_x = max;
                vertex[4].m_y = max;
                vertex[4].m_z = zz;
 
                vertex[5].m_x = min;
                vertex[5].m_y = max;
                vertex[5].m_z = zz;
 
                bgfx::setState(0);
                bgfx::setStencil(BGFX_STENCIL_TEST_ALWAYS | BGFX_STENCIL_FUNC_REF(1) | BGFX_STENCIL_FUNC_RMASK(0xff) |
                                 BGFX_STENCIL_OP_FAIL_S_REPLACE | BGFX_STENCIL_OP_FAIL_Z_REPLACE |
                                 BGFX_STENCIL_OP_PASS_Z_REPLACE);
                bgfx::setVertexBuffer(0, &vb);
 
                programs_.m_black->begin();
                bgfx::submit(RENDERVIEW_SHADOWMAP_0_ID, programs_.m_black->native_handle());
                programs_.m_black->end();
            }
        }
 
        anythingDrawn =
            render_scene_into_shadowmap(RENDERVIEW_SHADOWMAP_1_ID, models, lightFrustums, currentSmSettings);
    }
 
    if(anythingDrawn)
    {
        PackDepth::Enum depthType = (SmImpl::VSM == settings_.m_smImpl) ? PackDepth::VSM : PackDepth::RGBA;
        bool bVsmOrEsm = (SmImpl::VSM == settings_.m_smImpl) || (SmImpl::ESM == settings_.m_smImpl);
 
        // Blur shadow map.
        if(bVsmOrEsm && currentSmSettings->m_doBlur)
        {
            bgfx::setTexture(4, shadow_map_[0], bgfx::getTexture(rt_shadow_map_[0]));
            bgfx::setState(BGFX_STATE_WRITE_RGB | BGFX_STATE_WRITE_A);
            screenSpaceQuad(originBottomLeft);
            programs_.m_vBlur[depthType]->begin();
            bgfx::submit(RENDERVIEW_VBLUR_0_ID, programs_.m_vBlur[depthType]->native_handle());
            programs_.m_vBlur[depthType]->end();
 
            bgfx::setTexture(4, shadow_map_[0], bgfx::getTexture(rt_blur_));
            bgfx::setState(BGFX_STATE_WRITE_RGB | BGFX_STATE_WRITE_A);
            screenSpaceQuad(originBottomLeft);
            programs_.m_hBlur[depthType]->begin();
            bgfx::submit(RENDERVIEW_HBLUR_0_ID, programs_.m_hBlur[depthType]->native_handle());
            programs_.m_hBlur[depthType]->end();
 
            if(LightType::DirectionalLight == settings_.m_lightType)
            {
                for(uint8_t ii = 1, jj = 2; ii < settings_.m_numSplits; ++ii, jj += 2)
                {
                    const uint8_t viewId = RENDERVIEW_VBLUR_0_ID + jj;
 
                    bgfx::setTexture(4, shadow_map_[0], bgfx::getTexture(rt_shadow_map_[ii]));
                    bgfx::setState(BGFX_STATE_WRITE_RGB | BGFX_STATE_WRITE_A);
                    screenSpaceQuad(originBottomLeft);
                    bgfx::submit(viewId, programs_.m_vBlur[depthType]->native_handle());
 
                    bgfx::setTexture(4, shadow_map_[0], bgfx::getTexture(rt_blur_));
                    bgfx::setState(BGFX_STATE_WRITE_RGB | BGFX_STATE_WRITE_A);
                    screenSpaceQuad(originBottomLeft);
                    bgfx::submit(viewId + 1, programs_.m_hBlur[depthType]->native_handle());
                }
            }
        }
    }
}
 
auto shadowmap_generator::render_scene_into_shadowmap(uint8_t shadowmap_1_id,
                                                      const shadow_map_models_t& models,
                                                      const math::frustum lightFrustums[ShadowMapRenderTargets::Count],
                                                      ShadowMapSettings* currentSmSettings) -> bool
{
    bool any_rendered = false;
    // Draw scene into shadowmap.
    uint8_t drawNum;
    if(LightType::SpotLight == settings_.m_lightType)
    {
        drawNum = 1;
    }
    else if(LightType::PointLight == settings_.m_lightType)
    {
        drawNum = 4;
    }
    else // LightType::DirectionalLight == settings.m_lightType)
    {
        drawNum = uint8_t(settings_.m_numSplits);
    }
 
    for(const auto& e : models)
    {
        const auto& transform_comp = e.get<transform_component>();
        auto& model_comp = e.get<model_component>();
 
        const auto& model = model_comp.get_model();
        if(!model.is_valid())
            continue;
 
        const auto& world_transform = transform_comp.get_transform_global();
 
        const auto& world_bounds_transform = model_comp.get_world_bounds_transform();
        const auto& world_bounds = model_comp.get_world_bounds();
        const auto& local_bounds = model_comp.get_local_bounds();
 
        const auto& submesh_transforms = model_comp.get_submesh_transforms();
        const auto& bone_transforms = model_comp.get_bone_transforms();
        const auto& skinning_matrices = model_comp.get_skinning_transforms();
 
        const auto current_lod_index = 0;
        for(uint8_t ii = 0; ii < drawNum; ++ii)
        {
            auto query = lightFrustums[ii].classify_obb(local_bounds, world_bounds_transform);
            if(query == math::volume_query::outside)
            {
                continue;
            }
 
            const uint8_t viewId = shadowmap_1_id + ii;
 
            uint8_t renderStateIndex = RenderState::ShadowMap_PackDepth;
            if(LightType::PointLight == settings_.m_lightType && settings_.m_stencilPack)
            {
                renderStateIndex =
                    uint8_t((ii < 2) ? RenderState::ShadowMap_PackDepthHoriz : RenderState::ShadowMap_PackDepthVert);
            }
 
            const auto& _renderState = render_states[renderStateIndex];
 
            model::submit_callbacks callbacks;
            callbacks.setup_begin = [&](const model::submit_callbacks::params& submit_params)
            {
                auto& prog =
                    submit_params.skinned ? currentSmSettings->m_progPackSkinned : currentSmSettings->m_progPack;
                prog->begin();
            };
            callbacks.setup_params_per_instance = [&](const model::submit_callbacks::params& submit_params)
            {
                // Set uniforms.
                uniforms_.submitPerDrawUniforms();
 
                // Apply render state.
                gfx::set_stencil(_renderState.m_fstencil, _renderState.m_bstencil);
                gfx::set_state(_renderState.m_state, _renderState.m_blendFactorRgba);
            };
            callbacks.setup_params_per_submesh =
                [&](const model::submit_callbacks::params& submit_params, const material& mat)
            {
                auto& prog =
                    submit_params.skinned ? currentSmSettings->m_progPackSkinned : currentSmSettings->m_progPack;
 
                gfx::submit(viewId, prog->native_handle(), 0, submit_params.preserve_state);
            };
            callbacks.setup_end = [&](const model::submit_callbacks::params& submit_params)
            {
                auto& prog =
                    submit_params.skinned ? currentSmSettings->m_progPackSkinned : currentSmSettings->m_progPack;
 
                prog->end();
            };
 
            model_comp.set_last_render_frame(gfx::get_render_frame());
            model.submit(world_transform,
                         submesh_transforms,
                         bone_transforms,
                         skinning_matrices,
                         current_lod_index,
                         callbacks);
 
            any_rendered = true;
 
            // if bounds are fully inside this split we dont need to render it to the next one
            if(query == math::volume_query::inside)
            {
                break;
            }
        }
    }
 
    return any_rendered;
}
 
void Programs::init(rtti::context& ctx)
{
    // clang-format off
    auto& am = ctx.get_cached<asset_manager>();
    // clang-format on
 
    auto loadProgram = [&](const std::string& vs, const std::string& fs)
    {
        auto vs_shader = am.get_asset<gfx::shader>("engine:/data/shaders/shadowmaps/" + vs + ".sc");
        auto fs_shadfer = am.get_asset<gfx::shader>("engine:/data/shaders/shadowmaps/" + fs + ".sc");
 
        return std::make_shared<gpu_program>(vs_shader, fs_shadfer);
    };
 
    // clang-format off
     // Misc.
    m_black        = loadProgram("vs_shadowmaps_color",         "fs_shadowmaps_color_black");
 
    // Blur.
    m_vBlur[PackDepth::RGBA] = loadProgram("vs_shadowmaps_vblur", "fs_shadowmaps_vblur");
    m_hBlur[PackDepth::RGBA] = loadProgram("vs_shadowmaps_hblur", "fs_shadowmaps_hblur");
    m_vBlur[PackDepth::VSM]  = loadProgram("vs_shadowmaps_vblur", "fs_shadowmaps_vblur_vsm");
    m_hBlur[PackDepth::VSM]  = loadProgram("vs_shadowmaps_hblur", "fs_shadowmaps_hblur_vsm");
 
    // Draw depth.
    m_drawDepth[PackDepth::RGBA] = loadProgram("vs_shadowmaps_unpackdepth", "fs_shadowmaps_unpackdepth");
    m_drawDepth[PackDepth::VSM]  = loadProgram("vs_shadowmaps_unpackdepth", "fs_shadowmaps_unpackdepth_vsm");
 
    // Pack depth.
    m_packDepth[DepthImpl::InvZ][PackDepth::RGBA] = loadProgram("vs_shadowmaps_packdepth", "fs_shadowmaps_packdepth");
    m_packDepth[DepthImpl::InvZ][PackDepth::VSM]  = loadProgram("vs_shadowmaps_packdepth", "fs_shadowmaps_packdepth_vsm");
 
    m_packDepth[DepthImpl::Linear][PackDepth::RGBA] = loadProgram("vs_shadowmaps_packdepth_linear", "fs_shadowmaps_packdepth_linear");
    m_packDepth[DepthImpl::Linear][PackDepth::VSM]  = loadProgram("vs_shadowmaps_packdepth_linear", "fs_shadowmaps_packdepth_vsm_linear");
 
    m_packDepthSkinned[DepthImpl::InvZ][PackDepth::RGBA] = loadProgram("vs_shadowmaps_packdepth_skinned", "fs_shadowmaps_packdepth");
    m_packDepthSkinned[DepthImpl::InvZ][PackDepth::VSM]  = loadProgram("vs_shadowmaps_packdepth_skinned", "fs_shadowmaps_packdepth_vsm");
 
    m_packDepthSkinned[DepthImpl::Linear][PackDepth::RGBA] = loadProgram("vs_shadowmaps_packdepth_linear_skinned", "fs_shadowmaps_packdepth_linear");
    m_packDepthSkinned[DepthImpl::Linear][PackDepth::VSM]  = loadProgram("vs_shadowmaps_packdepth_linear_skinned", "fs_shadowmaps_packdepth_vsm_linear");
 
}
 
}
} // namespace unravel