Envmap.h

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#pragma once
 
#include "RenderParams.h"
#include "GraphicsObject/Texture.h"
#include "GraphicsObject/Mesh.h"
#include "GraphicsObject/Framebuffer.h"
#include "GraphicsObject/Shader.h"
 
#include <vector>
 
namespace dyno
{
class Envmap
{
public:
    Envmap();
    ~Envmap();
 
    void initialize();
    void release();
    void load(const char* path);
    void draw(const RenderParams& rparams);
 
    void bindIBL();
 
    void setScale(float scale);
 
private:
    void update();
    void genLUT();
 
public:
    const char* path = 0;
        
private:
    bool requireUpdate = false;
        
    struct {
        int width;
        int height;
        int component;
        std::vector<float> data;
        Texture2D tex;
    } image;
 
    TextureCube irradianceCube;
    TextureCube prefilteredCube;
    Texture2D  brdfLut;
 
    const int irradianceSize = 16;
    const int prefilteredSize = 128;
    const int brdfLutSize = 128;
 
    // draw envmap
    Program* prog;
 
    // cube mesh
    Mesh*   cube = 0;
 
    Framebuffer fb;
 
    struct {
        float scale = 1.f;
    } params;
    Buffer    uboParams;
};
 
};