offscreenbuffer.h

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/*****************************************************************************************
 * SGCT                                                                                  *
 * Simple Graphics Cluster Toolkit                                                       *
 *                                                                                       *
 * Copyright (c) 2012-2026                                                               *
 * For conditions of distribution and use, see copyright notice in LICENSE.md            *
 ****************************************************************************************/
 
#ifndef __SGCT__OFFSCREENBUFFER__H__
#define __SGCT__OFFSCREENBUFFER__H__
 
#include <sgct/sgctexports.h>
 
#include <sgct/math.h>
 
namespace sgct {

class SGCT_EXPORT OffScreenBuffer {
public:
    static void unbind();
 
    explicit OffScreenBuffer(unsigned int internalFormat);
    ~OffScreenBuffer();
 
    void createFBO(int width, int height, int samples = 1);
    void resizeFBO(int width, int height, int samples = 1);

    void attachColorTexture(unsigned int texId, unsigned int attachment) const;
    void attachDepthTexture(unsigned int texId) const;

    void attachCubeMapTexture(unsigned int texId, unsigned int face,
        unsigned int attachment) const;
    void attachCubeMapDepthTexture(unsigned int texId, unsigned int face) const;

    void bind() const;

    void bind(bool isMultisampled, int n, const unsigned int* bufs) const;
    void bindBlit() const;
    void blit() const;
    bool isMultiSampled() const;
 
private:
    unsigned int _frameBuffer = 0;
    unsigned int _multiSampledFrameBuffer = 0;
    unsigned int _colorBuffer = 0;
    unsigned int _normalBuffer = 0;
    unsigned int _positionBuffer = 0;
    unsigned int _depthBuffer = 0;
    const unsigned int _internalColorFormat = 0x8058; // GL_RGBA8;
 
    ivec2 _size = ivec2{ -1, -1 };
    bool _isMultiSampled = false;
};
 
} // namespace sgct
 
#endif // __SGCT__OFFSCREENBUFFER__H__