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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef FBO_H
#define FBO_H
#include <map>
#include "myGL.h"
// TODO: add multisample buffers
/**
* @brief FBO
*
* Framebuffer Object class (EXT_framebuffer_object).
*/
class FBO
{
public:
/**
* @brief IsSupported
*
* if FrameBuffers are supported by the current platform
*/
static bool IsSupported();
/**
* @brief Constructor
*/
FBO();
/**
* @brief Destructor
*/
~FBO();
/**
* @brief fboId
*
* GLuint pointing to the current framebuffer
*/
GLuint fboId;
/**
* @brief reloadOnAltTab
*
* bool save all attachments in system RAM and reloaded them on OpenGL-Context lost (alt-tab) (default: false)
*/
bool reloadOnAltTab;
/**
* @brief check FBO status
*/
bool CheckStatus(std::string name);
/**
* @brief get FBO status
*/
GLenum GetStatus();
/**
* @return GL_MAX_SAMPLES or 0 if multi-sampling not supported
*/
static GLsizei GetMaxSamples();
/**
* @brief IsValid
* @return whether a valid framebuffer exists
*/
bool IsValid() const;
/**
* @brief AttachTexture
* @param texTarget texture target (GL_TEXTURE_2D etc.)
* @param texId texture to attach
* @param attachment (GL_COLOR_ATTACHMENT0_EXT etc.)
* @param mipLevel miplevel to attach
* @param zSlice z offset (3d textures only)
*/
void AttachTexture(const GLuint texId, const GLenum texTarget = GL_TEXTURE_2D, const GLenum attachment = GL_COLOR_ATTACHMENT0_EXT, const int mipLevel = 0, const int zSlice = 0);
/**
* @brief AttachRenderBuffer
* @param rboId RenderBuffer to attach
* @param attachment
*/
void AttachRenderBuffer(const GLuint rboId, const GLenum attachment = GL_COLOR_ATTACHMENT0_EXT);
/**
* @brief Creates a RenderBufferObject and attachs it to the FBO (it is also auto destructed)
* @param attachment
* @param format
* @param width
* @param height
*/
void CreateRenderBuffer(const GLenum attachment, const GLenum format, const GLsizei width, const GLsizei height);
/**
* @brief Creates a multisampled RenderBufferObject and attachs it to the FBO (it is also auto destructed)
* @param attachment
* @param format
* @param width
* @param height
* @param samples
*/
void CreateRenderBufferMultisample(const GLenum attachment, const GLenum format, const GLsizei width, const GLsizei height, GLsizei samples);
/**
* @brief Detach
* @param attachment
*/
void Detach(const GLenum attachment);
/**
* @brief DetachAll
*/
void DetachAll();
/**
* @brief Bind
*/
void Bind();
/**
* @brief Unbind
*/
static void Unbind();
/**
* @brief GLContextLost (post atl-tab)
*/
static void GLContextLost();
/**
* @brief GLContextReinit (pre atl-tab)
*/
static void GLContextReinit();
private:
bool valid;
/**
* @brief rbos
*
* List with all Renderbuffer Objects that should be destructed with the FBO
*/
std::vector<GLuint> myRBOs;
struct TexData {
GLuint id;
unsigned char* pixels;
GLsizei xsize,ysize,zsize;
GLenum target,format,type;
};
static std::vector<FBO*> fboList;
static std::map<GLuint, TexData*> texBuf;
static GLint maxAttachments;
static GLsizei maxSamples;
/**
* @brief DownloadAttachment
*
* copies the attachment content to sysram
*/
static void DownloadAttachment(const GLenum attachment);
/**
* @brief GetTextureTargetByID
*
* detects the textureTarget just by the textureName/ID
*/
static GLenum GetTextureTargetByID(const GLuint id, const unsigned int i = 0);
};
#endif /* FBO_H */
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