ScreenSpaceShadows.h

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#pragma once
 
#include "../core/Core.h"
#include "../core/Tags.h"
#include "../core/LightUniforms.h"
 
#include <SDL3/SDL_gpu.h>
#include <span>
 
namespace candlewick {
namespace effects {

  struct ScreenSpaceShadowPass {
    struct Config {
      float maxDist = 1.0f;
      int numSteps = 16;
    } config;
    SDL_GPUTexture *depthTexture = nullptr;
    SDL_GPUSampler *depthSampler = nullptr;
    SDL_GPUTexture *targetTexture = nullptr;
    SDL_GPUGraphicsPipeline *pipeline = nullptr;
 
    bool valid() const {
      return depthTexture && depthSampler && targetTexture && pipeline;
    }
 
    ScreenSpaceShadowPass(NoInitT) {}
    ScreenSpaceShadowPass(const Renderer &renderer, const Config &config);
 
    void release(SDL_GPUDevice *device) noexcept;
 
    void render(CommandBuffer &cmdBuf, const Camera &camera,
                const DirectionalLight &light,
                std::span<const OpaqueCastable> castables);
  };
 
} // namespace effects
} // namespace candlewick