MRAlphaSortGL.h

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#pragma once
 
namespace MR
{
 
class AlphaSortGL
{
public:
    typedef unsigned int GLuint;
 
    ~AlphaSortGL();
 
    // Initialize all GL buffers and arrays
    void init();
    // Free all GL data
    void free();
 
    // Set all textures used for alpha sorting to zero (heads texture, atomics texture)
    void clearTransparencyTextures() const;
    // Draws alpha sorting overlay quad texture to screen
    void drawTransparencyTextureToScreen() const;
    // Updates size of textures used in alpha sorting (according to viewport size)
    void updateTransparencyTexturesSize( int width, int height );
 
private:
    bool inited_ = false;
    int width_{ 0 };
    int height_{ 0 };
 
    GLuint transparency_quad_vbo = 0;
    GLuint transparency_quad_vao = 0;
    GLuint transparency_heads_texture_vbo = 0;
    GLuint transparency_shared_shader_data_vbo = 0;
    GLuint transparency_atomic_counter_vbo = 0;
    GLuint transparency_static_clean_vbo = 0;
};
 
}