hiz_pass.h

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#pragma once
 
#include <engine/rendering/gpu_program.h>
#include <graphics/render_view.h>
#include <engine/rendering/camera.h>
#include <graphics/texture.h>
#include <graphics/render_pass.h>
#include <hpp/small_vector.hpp>
#include <bgfx/bgfx.h>
 
namespace unravel
{
 
class hiz_pass
{
public:
    struct run_params
    {
        gfx::texture::ptr depth_buffer;   
        gfx::texture::ptr output_hiz;     
        const camera* cam{};              
    };
 
    auto init(rtti::context& ctx) -> bool;
 
    void run(gfx::render_view& rview, const run_params& params);
 
private:
    struct hiz_generate_program : uniforms_cache
    {
        gpu_program::ptr program;
        gfx::program::uniform_ptr s_depth;         
        gfx::program::uniform_ptr u_hiz_params;    
 
        void cache_uniforms()
        {
            cache_uniform(program.get(), s_depth, "s_depth", gfx::uniform_type::Sampler);
            cache_uniform(program.get(), u_hiz_params, "u_hiz_params", gfx::uniform_type::Vec4);
        }
    };
 
    struct hiz_downsample_program : uniforms_cache
    {
        gpu_program::ptr program;
        gfx::program::uniform_ptr u_hiz_params;    
 
        void cache_uniforms()
        {
            cache_uniform(program.get(), u_hiz_params, "u_hiz_params", gfx::uniform_type::Vec4);
        }
    };
 
    hiz_generate_program hiz_generate_;     
    hiz_downsample_program hiz_downsample_; 
};
 
} // namespace unravel