SparseVolumeTexture.h

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#pragma once
#include "common/Export.h"
 
 
#include "graphics/AtmosphereVolume.h"
 
#include <cstddef>
#include <cstdint>
#include <string>
#include <unordered_map>
#include <vector>
 
namespace eve::graphics {
 
class VolumeDensityGraph;
 
class EVENGINE_API_BACKENDS SparseVolumeTexture {
public:
    void resize(int width, int height, int depth, int brickSize = 8);
    void clear();
 
    int getWidth() const { return width_; }
    int getHeight() const { return height_; }
    int getDepth() const { return depth_; }
    int getBrickSize() const { return brickSize_; }
    std::size_t getBrickCount() const { return bricks_.size(); }
    std::size_t getAllocatedVoxelCount() const;
 
    void setVoxel(int x, int y, int z, const FogFroxel &voxel);
    FogFroxel getVoxel(int x, int y, int z) const;
    FogFroxel sample(float u, float v, float w) const;
 
    void bake(const VolumeDensityGraph &graph, const glm::vec3 &worldMin,
              const glm::vec3 &worldMax, float extinctionScale, const glm::vec3 &albedo,
              float emptyThreshold = 1e-5f, float time = 0.f);
 
    bool save(const std::string &path) const;
    bool load(const std::string &path);
 
private:
    struct Brick {
        std::vector<FogFroxel> voxels;
    };
 
    std::uint64_t brickKey(int bx, int by, int bz) const;
    std::size_t localIndex(int x, int y, int z) const;
    bool inBounds(int x, int y, int z) const;
 
    int width_ = 0;
    int height_ = 0;
    int depth_ = 0;
    int brickSize_ = 8;
    std::unordered_map<std::uint64_t, Brick> bricks_;
};
 
}  // namespace eve::graphics