DepthPyramid.h

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#pragma once
 
#include <array>
 
namespace eve::graphics {
 
class Canvas;
class Graphics;
class Shader;
class Texture;
 
class DepthPyramid {
public:
    explicit DepthPyramid(Graphics *gfx);
 
    Texture *build(Texture *depth, int maxLevels = 8);
 
    int getLevelCount() const { return levelCount_; }
    int getSourceWidth() const { return sourceWidth_; }
    int getSourceHeight() const { return sourceHeight_; }
 
private:
    static constexpr int kMaxLevels = 8;
    void ensureTargets(int width, int height, int maxLevels);
 
    Graphics *gfx_ = nullptr;
    Shader *downsample_ = nullptr;
    std::array<Canvas *, kMaxLevels> levels_{};
    Canvas *atlas_ = nullptr;
    int sourceWidth_ = 0;
    int sourceHeight_ = 0;
    int levelCount_ = 0;
};
 
}  // namespace eve::graphics