src/OpenGLUtils/OpenGLUtils_FrameBuffer.cxx

   1 // Copyright (C) 2007-2014  CEA/DEN, EDF R&D, OPEN CASCADE
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Lesser General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2.1 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Lesser General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Lesser General Public
  14 // License along with this library; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  16 //
  17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  18 //
  19
  20 //  File   : OpenGLUtils_FrameBuffer.cxx
  21 //  Module : SALOME
  22 //
  23 #include "OpenGLUtils_FrameBuffer.h"
  24
  25 #include <utilities.h>
  26
  27 #include <cstring>
  28
  29 #ifndef WIN32
  30 # ifndef GLX_GLXEXT_LEGACY
  31 #  define GLX_GLXEXT_LEGACY
  32 # endif
  33 # include <GL/glx.h>
  34 # include <dlfcn.h>
  35 #else
  36 # include <wingdi.h>
  37 #endif
  38
  39 #ifndef APIENTRY
  40 #define APIENTRY
  41 #endif
  42 #ifndef APIENTRYP
  43 #define APIENTRYP APIENTRY *
  44 #endif
  45
  46 #ifndef GL_FRAMEBUFFER_EXT
  47 #define GL_FRAMEBUFFER_EXT                0x8D40
  48 #endif
  49
  50 #ifndef GL_RENDERBUFFER_EXT
  51 #define GL_RENDERBUFFER_EXT               0x8D41
  52 #endif
  53
  54 #ifndef GL_COLOR_ATTACHMENT0_EXT
  55 #define GL_COLOR_ATTACHMENT0_EXT          0x8CE0
  56 #endif
  57
  58 #ifndef GL_DEPTH_ATTACHMENT_EXT
  59 #define GL_DEPTH_ATTACHMENT_EXT           0x8D00
  60 #endif
  61
  62 #ifndef GL_FRAMEBUFFER_COMPLETE_EXT
  63 #define GL_FRAMEBUFFER_COMPLETE_EXT       0x8CD5
  64 #endif
  65
  66 typedef void (APIENTRYP PFNGLGENFRAMEBUFFERSEXTPROC) (GLsizei n, GLuint *framebuffers);
  67 typedef void (APIENTRYP PFNGLBINDFRAMEBUFFEREXTPROC) (GLenum target, GLuint framebuffer);
  68 typedef void (APIENTRYP PFNGLFRAMEBUFFERTEXTURE2DEXTPROC) (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
  69 typedef GLenum (APIENTRYP PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC) (GLenum target);
  70 typedef void (APIENTRYP PFNGLDELETEFRAMEBUFFERSEXTPROC) (GLsizei n, const GLuint *framebuffers);
  71 typedef void (APIENTRYP PFNGLGENRENDERBUFFERSEXTPROC) (GLsizei n, GLuint *renderbuffers);
  72 typedef void (APIENTRYP PFNGLBINDRENDERBUFFEREXTPROC) (GLenum target, GLuint renderbuffer);
  73 typedef void (APIENTRYP PFNGLRENDERBUFFERSTORAGEEXTPROC) (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
  74 typedef void (APIENTRYP PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC) (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
  75 typedef void (APIENTRYP PFNGLDELETERENDERBUFFERSEXTPROC) (GLsizei n, const GLuint *renderbuffers);
  76
  77 static PFNGLGENFRAMEBUFFERSEXTPROC vglGenFramebuffersEXT = NULL;
  78 static PFNGLBINDFRAMEBUFFEREXTPROC vglBindFramebufferEXT = NULL;
  79 static PFNGLFRAMEBUFFERTEXTURE2DEXTPROC vglFramebufferTexture2DEXT = NULL;
  80 static PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC vglCheckFramebufferStatusEXT = NULL;
  81 static PFNGLDELETEFRAMEBUFFERSEXTPROC vglDeleteFramebuffersEXT = NULL;
  82 static PFNGLGENRENDERBUFFERSEXTPROC vglGenRenderbuffersEXT = NULL;
  83 static PFNGLBINDRENDERBUFFEREXTPROC vglBindRenderbufferEXT = NULL;
  84 static PFNGLRENDERBUFFERSTORAGEEXTPROC vglRenderbufferStorageEXT = NULL;
  85 static PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC vglFramebufferRenderbufferEXT = NULL;
  86 static PFNGLDELETERENDERBUFFERSEXTPROC vglDeleteRenderbuffersEXT = NULL;
  87
  88 #ifndef WIN32
  89 #define GL_GetProcAddress( x ) glXGetProcAddressARB( (const GLubyte*)x )
  90 #else
  91 #define GL_GetProcAddress( x ) wglGetProcAddress( (const LPCSTR)x )
  92 #endif
  93
  94 bool InitializeEXT()
  95 {
  96   vglGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glGenFramebuffersEXT" );
  97   vglBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)GL_GetProcAddress( "glBindFramebufferEXT" );
  98   vglFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)GL_GetProcAddress( "glFramebufferTexture2DEXT" );
  99   vglCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)GL_GetProcAddress( "glCheckFramebufferStatusEXT" );
 100   vglDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteFramebuffersEXT" );
 101   vglGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)GL_GetProcAddress( "glGenRenderbuffersEXT" );
 102   vglBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)GL_GetProcAddress( "glBindRenderbufferEXT" );
 103   vglRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)GL_GetProcAddress( "glRenderbufferStorageEXT" );
 104   vglFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)GL_GetProcAddress( "glFramebufferRenderbufferEXT" );
 105   vglDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteRenderbuffersEXT" );
 106
 107   bool ok = vglGenFramebuffersEXT && vglBindFramebufferEXT && vglFramebufferTexture2DEXT &&
 108             vglCheckFramebufferStatusEXT && vglDeleteFramebuffersEXT && vglGenRenderbuffersEXT &&
 109             vglBindRenderbufferEXT && vglRenderbufferStorageEXT && vglFramebufferRenderbufferEXT &&
 110             vglDeleteRenderbuffersEXT;
 111
 112   return ok;
 113 }
 114
 115 static bool IsEXTInitialized = InitializeEXT();
 116
 117 OpenGLUtils_FrameBuffer::OpenGLUtils_FrameBuffer()
 118   : textureId( 0 ),
 119     fboId( 0 ),
 120     rboId( 0 )
 121 {
 122 }
 123
 124 OpenGLUtils_FrameBuffer::~OpenGLUtils_FrameBuffer()
 125 {
 126   release();
 127 }
 128
 129 bool OpenGLUtils_FrameBuffer::init( const GLsizei& xSize, const GLsizei& ySize )
 130 {
 131   char* ext = (char*)glGetString( GL_EXTENSIONS );
 132   if( !IsEXTInitialized ||
 133       strstr( ext, "GL_EXT_framebuffer_object" ) == NULL )
 134   {
 135     MESSAGE( "Initializing OpenGL FrameBuffer extension failed" );
 136     return false;
 137   }
 138
 139   // create a texture object
 140   glEnable( GL_TEXTURE_2D );
 141   glGenTextures( 1, &textureId );
 142   glBindTexture( GL_TEXTURE_2D, textureId );
 143   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
 144   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 145   glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, xSize, ySize, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL );
 146   glBindTexture( GL_TEXTURE_2D, 0 );
 147
 148   // create a renderbuffer object to store depth info
 149   vglGenRenderbuffersEXT( 1, &rboId );
 150   vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, rboId );
 151   vglRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, xSize, ySize );
 152   vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, 0 );
 153
 154   // create a framebuffer object
 155   vglGenFramebuffersEXT( 1, &fboId );
 156   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
 157
 158   // attach the texture to FBO color attachment point
 159   vglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, textureId, 0 );
 160
 161   // attach the renderbuffer to depth attachment point
 162   vglFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, rboId );
 163
 164   // check FBO status
 165   GLenum status = vglCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
 166
 167   // Unbind FBO
 168   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
 169
 170   return status == GL_FRAMEBUFFER_COMPLETE_EXT;
 171 }
 172
 173 void OpenGLUtils_FrameBuffer::release()
 174 {
 175   if( !IsEXTInitialized )
 176     return;
 177
 178   glDeleteTextures( 1, &textureId );
 179   textureId = 0;
 180
 181   vglDeleteFramebuffersEXT( 1, &fboId );
 182   fboId = 0;
 183
 184   vglDeleteRenderbuffersEXT( 1, &rboId );
 185   rboId = 0;
 186 }
 187
 188 void OpenGLUtils_FrameBuffer::bind()
 189 {
 190   if( !IsEXTInitialized )
 191     return;
 192
 193   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
 194 }
 195
 196 void OpenGLUtils_FrameBuffer::unbind()
 197 {
 198   if( !IsEXTInitialized )
 199     return;
 200
 201   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
 202 }