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#ifndef OPENGL_FRAME_BUFFER_H
#define OPENGL_FRAME_BUFFER_H
#include <OpenGl_Extension.hxx>
#include <Standard_Boolean.hxx>
#include <InterfaceGraphic.hxx>
#ifndef GL_FRAMEBUFFER_EXT
#define GL_FRAMEBUFFER_EXT 0x8D40
#endif
#ifndef GL_COLOR_ATTACHMENT0_EXT
#define GL_COLOR_ATTACHMENT0_EXT 0x8CE0
#endif
#ifndef GL_FRAMEBUFFER_COMPLETE_EXT
#define GL_FRAMEBUFFER_COMPLETE_EXT 0x8CD5
#endif
#ifndef GL_RENDERBUFFER_EXT
#define GL_RENDERBUFFER_EXT 0x8D41
#endif
#ifndef GL_DEPTH_ATTACHMENT_EXT
#define GL_DEPTH_ATTACHMENT_EXT 0x8D00
#endif
#ifdef WNT
#define GL_API_ENTRY APIENTRY
#else
#define GL_API_ENTRY
#endif
class OpenGl_FrameBuffer
{
public:
//! Helpful constants
static const GLuint NO_TEXTURE = 0;
static const GLuint NO_FRAMEBUFFER = 0;
static const GLuint NO_RENDERBUFFER = 0;
public:
typedef void (GL_API_ENTRY *glGenFramebuffersEXT_t) (GLsizei n, GLuint* ids);
typedef void (GL_API_ENTRY *glDeleteFramebuffersEXT_t) (GLsizei n, GLuint* ids);
typedef void (GL_API_ENTRY *glBindFramebufferEXT_t) (GLenum target, GLuint id);
typedef void (GL_API_ENTRY *glFramebufferTexture2DEXT_t) (GLenum target, GLenum attachmentPoint,
GLenum textureTarget, GLuint textureId,
GLint level);
typedef GLenum (GL_API_ENTRY *glCheckFramebufferStatusEXT_t) (GLenum target);
typedef void (GL_API_ENTRY *glGenRenderbuffersEXT_t) (GLsizei n, GLuint* ids);
typedef void (GL_API_ENTRY *glDeleteRenderbuffersEXT_t) (GLsizei n, GLuint* ids);
typedef void (GL_API_ENTRY *glBindRenderbufferEXT_t) (GLenum target, GLuint id);
typedef void (GL_API_ENTRY *glRenderbufferStorageEXT_t) (GLenum target, GLenum internalFormat,
GLsizei width, GLsizei height);
typedef void (GL_API_ENTRY *glFramebufferRenderbufferEXT_t) (GLenum target,
GLenum attachmentPoint,
GLenum renderbufferTarget,
GLuint renderbufferId);
public:
OpenGl_FrameBuffer (GLint theTextureFormat = GL_RGBA8);
virtual ~OpenGl_FrameBuffer()
{
Release();
}
//! Texture width.
GLsizei GetSizeX() const
{
return mySizeX;
}
//! Texture height.
GLsizei GetSizeY() const
{
return mySizeY;
}
//! Viewport width.
GLsizei GetVPSizeX() const
{
return myVPSizeX;
}
//! Viewport height.
GLsizei GetVPSizeY() const
{
return myVPSizeY;
}
//! Returns true if current object was initialized
Standard_Boolean IsValid() const
{
return IsValidFrameBuffer() && IsValidTexture() && IsValidDepthBuffer();
}
//! Notice! Obsolete hardware (GeForce FX etc)
//! doesn't support rectangular textures!
//! There are 3 possible results if you are trying
//! to create non power-of-two FBO on these cards:
//! 1) FBO creation will fail,
//! current implementation will try to generate compatible FBO;
//! 2) FBO rendering will be done in software mode (ForceWare 'hack');
//! 3) FBO rendering will be incorrect (some obsolete Catalyst drivers).
Standard_Boolean Init (GLsizei theViewportSizeX,
GLsizei theViewportSizeY,
GLboolean toForcePowerOfTwo = GL_FALSE);
//! Release GL objects
void Release();
//! Setup viewport to render into FBO
void SetupViewport()
{
glViewport (0, 0, myVPSizeX, myVPSizeY);
}
//! Override viewport settings
void ChangeViewport (const GLsizei theVPSizeX,
const GLsizei theVPSizeY)
{
myVPSizeX = theVPSizeX;
myVPSizeY = theVPSizeY;
}
//! Bind frame buffer (to render into the texture).
void BindBuffer()
{
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, myGlFBufferId);
}
//! Unbind frame buffer.
void UnbindBuffer()
{
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, NO_FRAMEBUFFER);
}
//! Bind the texture.
void BindTexture ()
{
glEnable (GL_TEXTURE_2D); // needed only for fixed pipeline rendering
glBindTexture (GL_TEXTURE_2D, myGlTextureId);
}
//! Unbind the texture.
void UnbindTexture()
{
glBindTexture (GL_TEXTURE_2D, NO_TEXTURE);
glDisable (GL_TEXTURE_2D); // needed only for fixed pipeline rendering
}
private:
//! Check texture could be created
Standard_Boolean IsProxySuccess() const;
//! Generate texture with undefined data
Standard_Boolean InitTrashTexture();
Standard_Boolean IsValidTexture() const
{
return myGlTextureId != NO_TEXTURE;
}
Standard_Boolean IsValidFrameBuffer() const
{
return myGlFBufferId != NO_FRAMEBUFFER;
}
Standard_Boolean IsValidDepthBuffer() const
{
return myGlTextureId != NO_RENDERBUFFER;
}
Standard_Boolean AreFBOFunctionsValid();
Standard_Boolean InitFBOFunctions();
private:
GLsizei mySizeX; // texture width
GLsizei mySizeY; // texture height
GLsizei myVPSizeX; // viewport width (should be <= texture width)
GLsizei myVPSizeY; // viewport height (should be <= texture height)
GLint myTextFormat; // GL_RGB, GL_RGBA,...
GLuint myGlTextureId; // GL texture ID
GLuint myGlFBufferId; // FBO object ID
GLuint myGlDepthRBId; // RenderBuffer object for depth ID
// functions
glGenFramebuffersEXT_t glGenFramebuffersEXT;
glDeleteFramebuffersEXT_t glDeleteFramebuffersEXT;
glBindFramebufferEXT_t glBindFramebufferEXT;
glFramebufferTexture2DEXT_t glFramebufferTexture2DEXT;
glCheckFramebufferStatusEXT_t glCheckFramebufferStatusEXT;
glGenRenderbuffersEXT_t glGenRenderbuffersEXT;
glDeleteRenderbuffersEXT_t glDeleteRenderbuffersEXT;
glBindRenderbufferEXT_t glBindRenderbufferEXT;
glRenderbufferStorageEXT_t glRenderbufferStorageEXT;
glFramebufferRenderbufferEXT_t glFramebufferRenderbufferEXT;
};
#endif //OPENGL_FRAME_BUFFER_H
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