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#include <OpenGl_FrameBuffer.hxx>
#ifdef DEB
#include <iostream>
#endif
#ifndef WNT
#define glGetProcAddress( x ) glXGetProcAddress( (const GLubyte*) x )
#else
#define glGetProcAddress( x ) wglGetProcAddress( x )
#endif
static inline bool isOddNumber (const GLsizei theNumber)
{
return theNumber & 0x01;
}
static inline GLsizei getEvenNumber (const GLsizei theNumber)
{
return isOddNumber (theNumber) ? (theNumber + 1) : theNumber;
}
//! Notice - 0 is not power of two here
static inline bool isPowerOfTwo (const GLsizei theNumber)
{
return !(theNumber & (theNumber - 1));
}
static inline GLsizei getPowerOfTwo (const GLsizei theNumber,
const GLsizei theThreshold)
{
for (GLsizei p2 = 2; p2 <= theThreshold; p2 <<= 1)
{
if (theNumber <= p2)
{
return p2;
}
}
return theThreshold;
}
Standard_Boolean OpenGl_FrameBuffer::AreFBOFunctionsValid()
{
return glGenFramebuffersEXT != NULL
&& glDeleteFramebuffersEXT != NULL
&& glBindFramebufferEXT != NULL
&& glFramebufferTexture2DEXT != NULL
&& glCheckFramebufferStatusEXT != NULL
&& glGenRenderbuffersEXT != NULL
&& glBindRenderbufferEXT != NULL
&& glDeleteRenderbuffersEXT != NULL
&& glRenderbufferStorageEXT != NULL
&& glFramebufferRenderbufferEXT != NULL;
}
Standard_Boolean OpenGl_FrameBuffer::InitFBOFunctions()
{
if (AreFBOFunctionsValid())
{
return Standard_True;
}
if (CheckExtension ((char *)"GL_EXT_framebuffer_object", (const char *)glGetString (GL_EXTENSIONS)))
{
glGenFramebuffersEXT = (glGenFramebuffersEXT_t) glGetProcAddress ("glGenFramebuffersEXT");
glDeleteFramebuffersEXT = (glDeleteFramebuffersEXT_t) glGetProcAddress ("glDeleteFramebuffersEXT");
glBindFramebufferEXT = (glBindFramebufferEXT_t) glGetProcAddress ("glBindFramebufferEXT");
glFramebufferTexture2DEXT = (glFramebufferTexture2DEXT_t) glGetProcAddress ("glFramebufferTexture2DEXT");
glCheckFramebufferStatusEXT = (glCheckFramebufferStatusEXT_t) glGetProcAddress ("glCheckFramebufferStatusEXT");
glGenRenderbuffersEXT = (glGenRenderbuffersEXT_t) glGetProcAddress ("glGenRenderbuffersEXT");
glDeleteRenderbuffersEXT = (glDeleteRenderbuffersEXT_t) glGetProcAddress ("glDeleteRenderbuffersEXT");
glBindRenderbufferEXT = (glBindRenderbufferEXT_t) glGetProcAddress ("glBindRenderbufferEXT");
glRenderbufferStorageEXT = (glRenderbufferStorageEXT_t) glGetProcAddress ("glRenderbufferStorageEXT");
glFramebufferRenderbufferEXT = (glFramebufferRenderbufferEXT_t)glGetProcAddress ("glFramebufferRenderbufferEXT");
return AreFBOFunctionsValid();
}
return Standard_False;
}
OpenGl_FrameBuffer::OpenGl_FrameBuffer (GLint theTextureFormat)
: mySizeX (0),
mySizeY (0),
myVPSizeX (0),
myVPSizeY (0),
myTextFormat (theTextureFormat),
myGlTextureId (NO_TEXTURE),
myGlFBufferId (NO_FRAMEBUFFER),
myGlDepthRBId (NO_RENDERBUFFER),
glGenFramebuffersEXT (NULL),
glDeleteFramebuffersEXT (NULL),
glBindFramebufferEXT (NULL),
glFramebufferTexture2DEXT (NULL),
glCheckFramebufferStatusEXT (NULL),
glGenRenderbuffersEXT (NULL),
glDeleteRenderbuffersEXT (NULL),
glBindRenderbufferEXT (NULL),
glRenderbufferStorageEXT (NULL),
glFramebufferRenderbufferEXT (NULL)
{
//
}
Standard_Boolean OpenGl_FrameBuffer::Init (GLsizei theViewportSizeX,
GLsizei theViewportSizeY,
GLboolean toForcePowerOfTwo)
{
if (!InitFBOFunctions())
{
#ifdef DEB
std::cerr << "OpenGl_FrameBuffer, FBO extension not supported!\n";
#endif
return Standard_False;
}
// clean up previous state
Release();
// upscale width/height if numbers are odd
if (toForcePowerOfTwo)
{
GLint aMaxTexDim = 2048;
glGetIntegerv (GL_MAX_TEXTURE_SIZE, &aMaxTexDim);
mySizeX = getPowerOfTwo (theViewportSizeX, aMaxTexDim);
mySizeY = getPowerOfTwo (theViewportSizeY, aMaxTexDim);
}
else
{
mySizeX = getEvenNumber (theViewportSizeX);
mySizeY = getEvenNumber (theViewportSizeY);
}
// setup viewport sizes as is
myVPSizeX = theViewportSizeX;
myVPSizeY = theViewportSizeY;
// Create the texture (will be used as color buffer)
if (!InitTrashTexture())
{
if (!isPowerOfTwo (mySizeX) || !isPowerOfTwo (mySizeY))
{
return Init (theViewportSizeX, theViewportSizeY, GL_TRUE);
}
Release();
return Standard_False;
}
// Create RenderBuffer (will be used as depth buffer)
glGenRenderbuffersEXT (1, &myGlDepthRBId);
glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, myGlDepthRBId);
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, mySizeX, mySizeY);
// Build FBO and setup it as texture
glGenFramebuffersEXT (1, &myGlFBufferId);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, myGlFBufferId);
glEnable (GL_TEXTURE_2D);
glBindTexture (GL_TEXTURE_2D, myGlTextureId);
glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, myGlTextureId, 0);
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, myGlFBufferId);
if (glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT) != GL_FRAMEBUFFER_COMPLETE_EXT)
{
if (!isPowerOfTwo (mySizeX) || !isPowerOfTwo (mySizeY))
{
return Init (theViewportSizeX, theViewportSizeY, GL_TRUE);
}
Release();
return Standard_False;
}
UnbindBuffer();
UnbindTexture();
glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, NO_RENDERBUFFER);
#ifdef DEB
std::cerr << "OpenGl_FrameBuffer, created FBO " << mySizeX << "x" << mySizeY
<< " for viewport " << theViewportSizeX << "x" << theViewportSizeY << "\n";
#endif
return Standard_True;
}
void OpenGl_FrameBuffer::Release()
{
if (IsValidDepthBuffer())
{
glDeleteRenderbuffersEXT (1, &myGlDepthRBId);
myGlDepthRBId = NO_RENDERBUFFER;
}
if (IsValidTexture())
{
glDeleteTextures (1, &myGlTextureId);
myGlTextureId = NO_TEXTURE;
}
mySizeX = mySizeY = myVPSizeX = myVPSizeY = 0;
if (IsValidFrameBuffer())
{
glDeleteFramebuffersEXT (1, &myGlFBufferId);
myGlFBufferId = NO_FRAMEBUFFER;
}
}
Standard_Boolean OpenGl_FrameBuffer::IsProxySuccess() const
{
// use proxy to check texture could be created or not
glTexImage2D (GL_PROXY_TEXTURE_2D,
0, // LOD number: 0 - base image level; n is the nth mipmap reduction image
myTextFormat, // internalformat
mySizeX, mySizeY, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
GLint aTestParamX (0), aTestParamY (0);
glGetTexLevelParameteriv (GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &aTestParamX);
glGetTexLevelParameteriv (GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &aTestParamY);
return aTestParamX != 0 && aTestParamY != 0;
}
Standard_Boolean OpenGl_FrameBuffer::InitTrashTexture()
{
// Check texture size is fit dimension maximum
GLint aMaxTexDim = 2048;
glGetIntegerv (GL_MAX_TEXTURE_SIZE, &aMaxTexDim);
if (mySizeX > aMaxTexDim || mySizeY > aMaxTexDim)
{
return Standard_False;
}
// generate new id
glEnable (GL_TEXTURE_2D);
if (!IsValidTexture())
{
glGenTextures (1, &myGlTextureId); // Create The Texture
}
glBindTexture (GL_TEXTURE_2D, myGlTextureId);
// texture interpolation parameters - could be overridden later
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
if (!IsProxySuccess())
{
Release();
return Standard_False;
}
glTexImage2D (GL_TEXTURE_2D,
0, // LOD number: 0 - base image level; n is the nth mipmap reduction image
myTextFormat, // internalformat
mySizeX, mySizeY, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL); // NULL pointer supported from OpenGL 1.1
return Standard_True;
}
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