prefilter_pass.h

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// prefilter_pass.h
#pragma once
 
#include <bgfx/bgfx.h>
#include <engine/rendering/camera.h>
#include <engine/rendering/gpu_program.h>
#include <graphics/render_pass.h>
#include <graphics/render_view.h>
#include <graphics/texture.h>
 
namespace unravel
{
class prefilter_pass
{
public:
    struct run_params
    {
        std::array<gfx::texture::ptr, 6> input_faces;
        gfx::texture::ptr output_cube;   
        gfx::texture::ptr output_cube_prefiltered;   
        bool              apply_prefilter = true; 
    };
 
    auto init(rtti::context& ctx) -> bool;
 
    auto run(gfx::render_view& rview, const run_params& params) -> gfx::texture::ptr;
 
    auto run_compute(gfx::render_view& rview, const run_params& params) -> gfx::texture::ptr;
 
private:
    void generate_mips(const gfx::texture::ptr& texture);
 
    struct cs_prog : uniforms_cache
    {
        void cache_uniforms()
        {
            cache_uniform(program.get(), s_env,  "s_env", gfx::uniform_type::Sampler);
            cache_uniform(program.get(), u_data, "u_data", gfx::uniform_type::Vec4);
        }
 
        gfx::program::uniform_ptr s_env;  
        gfx::program::uniform_ptr u_data; 
        std::unique_ptr<gpu_program> program;
    } cs_;
 
};
 
} // namespace unravel