Integration of OCCT 6.5.0 from SVN

src/OpenGl/OpenGl_FrameBuffer.cxx

@@ -0,0 +1,247 @@
+#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;
+}