Exposure.h

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#pragma once
 
#include <glm/vec3.hpp>
 
namespace eve::graphics {
 
class Canvas;
class Graphics;
class Shader;
class Texture;
 
class Exposure {
public:
    explicit Exposure(Graphics *gfx);
 
    Texture *apply(Texture *source, float manualExposure, bool automatic, float minEV,
                   float maxEV, const glm::vec3& colorFilter, const glm::vec3& lift,
                   const glm::vec3& inverseGamma, const glm::vec3& gain, float vignette,
                   float vignetteSmoothness, float lensDistortion, float lensScale,
                   Texture *meterSource = nullptr,
                   float deltaSeconds = 1.f / 60.f);
 
    void invalidateHistory() { historyValid_ = false; }
 
private:
    void ensureTargets(int width, int height);
 
    Graphics *gfx_ = nullptr;
    Shader *meterShader_ = nullptr;
    Shader *adaptShader_ = nullptr;
    Shader *applyShader_ = nullptr;
    Canvas *meter_ = nullptr;
    Canvas *historyA_ = nullptr;
    Canvas *historyB_ = nullptr;
    Canvas *historyRead_ = nullptr;
    Canvas *historyWrite_ = nullptr;
    Canvas *output_ = nullptr;
    int width_ = 0;
    int height_ = 0;
    bool historyValid_ = false;
};
 
}  // namespace eve::graphics