rendering_system.cpp

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#include "rendering_system.h"
#include "particle_system.h"
 
#include <engine/ui/ecs/systems/ui_system.h>
#include <engine/rendering/mesh.h>
#include <engine/rendering/model.h>
#include <engine/rendering/pipeline/pipeline.h>
#include <engine/profiler/profiler.h>
 
#include <engine/animation/ecs/systems/animation_system.h>
#include <engine/ecs/components/transform_component.h>
#include <engine/ecs/systems/transform_system.h>
#include <engine/engine.h>
#include <engine/events.h>
 
#include <engine/rendering/ecs/components/camera_component.h>
#include <engine/rendering/ecs/components/model_component.h>
 
#include <engine/rendering/ecs/systems/camera_system.h>
#include <engine/rendering/ecs/systems/model_system.h>
#include <engine/rendering/ecs/systems/reflection_probe_system.h>
#include <engine/rendering/ecs/systems/skylight_system.h>
 
namespace unravel
{
 
auto rendering_system::init(rtti::context& ctx) -> bool
{
    APPLOG_TRACE("{}::{}", hpp::type_name_str(*this), __func__);
    auto& ev = ctx.get_cached<events>();
 
    ev.on_frame_end.connect(sentinel_, 1000, this, &rendering_system::on_frame_end);
 
    debug_draw_callbacks_.reserve(128);
    return true;
}
 
auto rendering_system::deinit(rtti::context& ctx) -> bool
{
    APPLOG_TRACE("{}::{}", hpp::type_name_str(*this), __func__);
 
    return true;
}
 
void rendering_system::on_frame_end(rtti::context& ctx, delta_t dt)
{
    APP_SCOPE_PERF("Rendering/On Frame End");
    debug_draw_callbacks_.clear();
}
 
void rendering_system::on_frame_update(scene& scn, delta_t dt)
{
    APP_SCOPE_PERF("Rendering/On Frame Update");
    auto& ctx = engine::context();
    ctx.get_cached<transform_system>().on_frame_update(scn, dt);
    ctx.get_cached<camera_system>().on_frame_update(scn, dt);
    ctx.get_cached<model_system>().on_frame_update(scn, dt);
    ctx.get_cached<animation_system>().on_frame_update(scn, dt);
    ctx.get_cached<reflection_probe_system>().on_frame_update(scn, dt);
    ctx.get_cached<skylight_system>().on_frame_update(scn, dt);
}
 
void rendering_system::on_frame_before_render(scene& scn, delta_t dt)
{
    APP_SCOPE_PERF("Rendering/On Frame Before Render");
    auto& ctx = engine::context();
    ctx.get_cached<model_system>().on_frame_before_render(scn, dt);
    ctx.get_cached<camera_system>().on_frame_before_render(scn, dt);
    ctx.get_cached<particle_system>().on_frame_before_render(scn, dt);
 
 
}
 
void rendering_system::on_play_begin(hpp::span<const entt::handle> entities, delta_t dt)
{
    APP_SCOPE_PERF("Rendering/On Play Begin");
    auto& ctx = engine::context();
    ctx.get_cached<transform_system>().on_play_begin(entities, dt);
    ctx.get_cached<camera_system>().on_play_begin(entities, dt);
    ctx.get_cached<model_system>().on_play_begin(entities, dt);
    ctx.get_cached<animation_system>().on_play_begin(entities, dt);
    ctx.get_cached<reflection_probe_system>().on_play_begin(entities, dt);
}
 
auto rendering_system::release_pipeline_resources(scene& scn) -> bool
{
    APP_SCOPE_PERF("Rendering/Release Pipeline Resources");
    auto& ctx = engine::context();
    scn.registry->view<camera_component>().each(
        [&](auto e, auto&& camera_comp)
        {
            auto& pipeline_data = camera_comp.get_pipeline_data();
            auto& camera = pipeline_data.get_camera();
            auto& pipeline = pipeline_data.get_pipeline();
            auto& rview = camera_comp.get_render_view();
            rview = {};
            return;
        });
    return true;
}
 
auto rendering_system::render_scene(entt::handle camera_ent, camera_component& camera_comp, scene& scn, delta_t dt,
                                    bool render_screen_space) -> gfx::frame_buffer::ptr
{
    APP_SCOPE_PERF("Rendering/Render Scene Camera");
    auto& ctx = engine::context();
    auto& pipeline_data = camera_comp.get_pipeline_data();
    auto& camera = pipeline_data.get_camera();
    auto& pipeline = pipeline_data.get_pipeline();
    auto& rview = camera_comp.get_render_view();
 
    auto& ui = ctx.get_cached<ui_system>();
    bool process_input = render_screen_space;
    ui.update_screen_space(ctx, camera_ent, scn, process_input);
    ui.update_world_space(ctx, camera_ent, scn, process_input);
 
    ui.render_world_space(ctx, camera_ent, scn, dt);
 
    auto params = pipeline->create_run_params(camera_ent, &scn, &camera);
    auto result = pipeline->run_pipeline(scn, camera, rview, dt, params, camera_comp.get_render_mask());
    render_debug(camera_ent);
    if(render_screen_space)
    {
        ui.render_screen_space(ctx, result, camera_ent, scn, dt);
    }
    return result;
}
 
auto rendering_system::render_scene(scene& scn, delta_t dt) -> gfx::frame_buffer::ptr
{
    APP_SCOPE_PERF("Rendering/Render Scene");
    auto& ctx = engine::context();
    gfx::frame_buffer::ptr output{};
    scn.registry->view<camera_component>().each(
        [&](auto e, auto&& camera_comp)
        {
            auto handle = scn.create_handle(e);
            output = render_scene(handle, camera_comp, scn, dt, true);
            return;
        });
    return output;
}
 
void rendering_system::render_scene(const gfx::frame_buffer::ptr& output,
                                    entt::handle camera_ent,
                                    camera_component& camera_comp,
                                    scene& scn,
                                    delta_t dt,
                                    bool render_screen_space)
{
    APP_SCOPE_PERF("Rendering/Render Scene");
    auto& ctx = engine::context();
    auto& pipeline_data = camera_comp.get_pipeline_data();
    auto& camera = pipeline_data.get_camera();
    auto& pipeline = pipeline_data.get_pipeline();
    auto& rview = camera_comp.get_render_view();
    auto& ui = ctx.get_cached<ui_system>();
 
    bool process_input = render_screen_space;
    ui.update_screen_space(ctx, camera_ent, scn, process_input);
    ui.update_world_space(ctx, camera_ent, scn, process_input);
 
    ui.render_world_space(ctx, camera_ent, scn, dt);
 
    auto params = pipeline->create_run_params(camera_ent, &scn, &camera);
    pipeline->run_pipeline(output, scn, camera, rview, dt, params, camera_comp.get_render_mask());
    render_debug(camera_ent);
    if(render_screen_space)
    {
        ui.render_screen_space(ctx, output, camera_ent, scn, dt);
    }
}
 
void rendering_system::render_scene(const gfx::frame_buffer::ptr& output, scene& scn, delta_t dt)
{
    APP_SCOPE_PERF("Rendering/Render Scene");
    auto& ctx = engine::context();
    scn.registry->view<camera_component>().each(
        [&](auto e, auto&& camera_comp)
        {
            auto handle = scn.create_handle(e);
            render_scene(output, handle, camera_comp, scn, dt, true);
        });
}
 
void rendering_system::render_debug(entt::handle camera_entity)
{
    if(debug_draw_callbacks_.empty())
    {
        return;
    }
 
    APP_SCOPE_PERF("Rendering/Render Debug");
 
    auto& camera_comp = camera_entity.get<camera_component>();
    const auto& rview = camera_comp.get_render_view();
    const auto& camera = camera_comp.get_camera();
    const auto& view = camera.get_view();
    const auto& proj = camera.get_projection();
    const auto& obuffer = rview.fbo_get("OBUFFER");
 
    gfx::render_pass pass("Debug Draw Pass");
    pass.bind(obuffer.get());
    pass.set_view_proj(view, proj);
 
    gfx::dd_raii dd(pass.id);
 
    for(const auto& callback : debug_draw_callbacks_)
    {
        callback(dd);
    }
}
 
void rendering_system::add_debugdraw_call(const std::function<void(gfx::dd_raii& dd)>& callback)
{
    debug_draw_callbacks_.emplace_back(callback);
}
 
 
} // namespace unravel