src/OpenGLUtils/OpenGLUtils_FrameBuffer.cxx

   1 // Copyright (C) 2007-2016  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 #ifdef VTK_OPENGL2
  24 #define GL_GLEXT_PROTOTYPES
  25 #endif
  26
  27 #include "OpenGLUtils_FrameBuffer.h"
  28
  29 #include <utilities.h>
  30
  31 #include <cstring>
  32
  33 #ifndef WIN32
  34 # ifndef GLX_GLXEXT_LEGACY
  35 #  define GLX_GLXEXT_LEGACY
  36 # endif
  37 #ifdef __APPLE__
  38 #import <mach-o/dyld.h>
  39 #import <stdlib.h>
  40 #import <string.h>
  41 void * glXGetProcAddressARB (const GLubyte *name)
  42
  43 {
  44     NSSymbol symbol;
  45     char *symbolName;
  46     symbolName = (char *)malloc (strlen ((const char *)name) + 2); // 1
  47     strcpy(symbolName + 1, (const char *)name); // 2
  48     symbolName[0] = '_'; // 3
  49     symbol = NULL;
  50     if (NSIsSymbolNameDefined (symbolName)) // 4
  51         symbol = NSLookupAndBindSymbol (symbolName);
  52     free (symbolName); // 5
  53     return symbol ? NSAddressOfSymbol (symbol) : NULL; // 6
  54 }
  55 #else
  56 # include <GL/glx.h>
  57 #endif
  58 # include <dlfcn.h>
  59 #else
  60 # include <wingdi.h>
  61 #endif
  62
  63 #ifndef APIENTRY
  64 #define APIENTRY
  65 #endif
  66 #ifndef APIENTRYP
  67 #define APIENTRYP APIENTRY *
  68 #endif
  69
  70 #ifndef GL_FRAMEBUFFER_EXT
  71 #define GL_FRAMEBUFFER_EXT                0x8D40
  72 #endif
  73
  74 #ifndef GL_RENDERBUFFER_EXT
  75 #define GL_RENDERBUFFER_EXT               0x8D41
  76 #endif
  77
  78 #ifndef GL_COLOR_ATTACHMENT0_EXT
  79 #define GL_COLOR_ATTACHMENT0_EXT          0x8CE0
  80 #endif
  81
  82 #ifndef GL_DEPTH_ATTACHMENT_EXT
  83 #define GL_DEPTH_ATTACHMENT_EXT           0x8D00
  84 #endif
  85
  86 #ifndef GL_FRAMEBUFFER_COMPLETE_EXT
  87 #define GL_FRAMEBUFFER_COMPLETE_EXT       0x8CD5
  88 #endif
  89
  90 typedef void (APIENTRYP PFNGLGENFRAMEBUFFERSEXTPROC) (GLsizei n, GLuint *framebuffers);
  91 typedef void (APIENTRYP PFNGLBINDFRAMEBUFFEREXTPROC) (GLenum target, GLuint framebuffer);
  92 typedef void (APIENTRYP PFNGLFRAMEBUFFERTEXTURE2DEXTPROC) (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
  93 typedef GLenum (APIENTRYP PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC) (GLenum target);
  94 typedef void (APIENTRYP PFNGLDELETEFRAMEBUFFERSEXTPROC) (GLsizei n, const GLuint *framebuffers);
  95 typedef void (APIENTRYP PFNGLGENRENDERBUFFERSEXTPROC) (GLsizei n, GLuint *renderbuffers);
  96 typedef void (APIENTRYP PFNGLBINDRENDERBUFFEREXTPROC) (GLenum target, GLuint renderbuffer);
  97 typedef void (APIENTRYP PFNGLRENDERBUFFERSTORAGEEXTPROC) (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
  98 typedef void (APIENTRYP PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC) (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
  99 typedef void (APIENTRYP PFNGLDELETERENDERBUFFERSEXTPROC) (GLsizei n, const GLuint *renderbuffers);
 100
 101 static PFNGLGENFRAMEBUFFERSEXTPROC vglGenFramebuffersEXT = NULL;
 102 static PFNGLBINDFRAMEBUFFEREXTPROC vglBindFramebufferEXT = NULL;
 103 static PFNGLFRAMEBUFFERTEXTURE2DEXTPROC vglFramebufferTexture2DEXT = NULL;
 104 static PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC vglCheckFramebufferStatusEXT = NULL;
 105 static PFNGLDELETEFRAMEBUFFERSEXTPROC vglDeleteFramebuffersEXT = NULL;
 106 static PFNGLGENRENDERBUFFERSEXTPROC vglGenRenderbuffersEXT = NULL;
 107 static PFNGLBINDRENDERBUFFEREXTPROC vglBindRenderbufferEXT = NULL;
 108 static PFNGLRENDERBUFFERSTORAGEEXTPROC vglRenderbufferStorageEXT = NULL;
 109 static PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC vglFramebufferRenderbufferEXT = NULL;
 110 static PFNGLDELETERENDERBUFFERSEXTPROC vglDeleteRenderbuffersEXT = NULL;
 111
 112 #ifndef WIN32
 113 #define GL_GetProcAddress( x ) glXGetProcAddressARB( (const GLubyte*)x )
 114 #else
 115 #define GL_GetProcAddress( x ) wglGetProcAddress( (const LPCSTR)x )
 116 #endif
 117
 118 bool InitializeEXT()
 119 {
 120   vglGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glGenFramebuffersEXT" );
 121   vglBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)GL_GetProcAddress( "glBindFramebufferEXT" );
 122   vglFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)GL_GetProcAddress( "glFramebufferTexture2DEXT" );
 123   vglCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)GL_GetProcAddress( "glCheckFramebufferStatusEXT" );
 124   vglDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteFramebuffersEXT" );
 125   vglGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)GL_GetProcAddress( "glGenRenderbuffersEXT" );
 126   vglBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)GL_GetProcAddress( "glBindRenderbufferEXT" );
 127   vglRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)GL_GetProcAddress( "glRenderbufferStorageEXT" );
 128   vglFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)GL_GetProcAddress( "glFramebufferRenderbufferEXT" );
 129   vglDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteRenderbuffersEXT" );
 130
 131   bool ok = vglGenFramebuffersEXT && vglBindFramebufferEXT && vglFramebufferTexture2DEXT &&
 132             vglCheckFramebufferStatusEXT && vglDeleteFramebuffersEXT && vglGenRenderbuffersEXT &&
 133             vglBindRenderbufferEXT && vglRenderbufferStorageEXT && vglFramebufferRenderbufferEXT &&
 134             vglDeleteRenderbuffersEXT;
 135
 136   return ok;
 137 }
 138
 139 static bool IsEXTInitialized = InitializeEXT();
 140
 141 OpenGLUtils_FrameBuffer::OpenGLUtils_FrameBuffer()
 142   : textureId( 0 ),
 143     fboId( 0 ),
 144     rboId( 0 )
 145 {
 146 }
 147
 148 OpenGLUtils_FrameBuffer::~OpenGLUtils_FrameBuffer()
 149 {
 150   release();
 151 }
 152
 153 bool OpenGLUtils_FrameBuffer::init( const GLsizei& xSize, const GLsizei& ySize )
 154 {
 155 #ifdef VTK_OPENGL2
 156   int n = 0;
 157   std::ostringstream strm;
 158   glGetIntegerv(GL_NUM_EXTENSIONS, &n);
 159   for (int i = 0; i < n; i++)
 160     {
 161       const char *exti = (const char *)glGetStringi(GL_EXTENSIONS, i);
 162       strm<< exti <<" ";
 163     }
 164   std::string s = strm.str();
 165   const char* ext = s.c_str();
 166 #else
 167   char* ext = (char*)glGetString( GL_EXTENSIONS );
 168 #endif
 169   if( !IsEXTInitialized || !ext ||
 170       strstr( ext, "GL_EXT_framebuffer_object" ) == NULL )
 171   {
 172     MESSAGE( "Initializing OpenGL FrameBuffer extension failed" );
 173     return false;
 174   }
 175
 176   // create a texture object
 177   glEnable( GL_TEXTURE_2D );
 178   glGenTextures( 1, &textureId );
 179   glBindTexture( GL_TEXTURE_2D, textureId );
 180   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
 181   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 182   glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, xSize, ySize, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL );
 183   glBindTexture( GL_TEXTURE_2D, 0 );
 184
 185   // create a renderbuffer object to store depth info
 186   vglGenRenderbuffersEXT( 1, &rboId );
 187   vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, rboId );
 188   vglRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, xSize, ySize );
 189   vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, 0 );
 190
 191   // create a framebuffer object
 192   vglGenFramebuffersEXT( 1, &fboId );
 193   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
 194
 195   // attach the texture to FBO color attachment point
 196   vglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, textureId, 0 );
 197
 198   // attach the renderbuffer to depth attachment point
 199   vglFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, rboId );
 200
 201   // check FBO status
 202   GLenum status = vglCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
 203
 204   // Unbind FBO
 205   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
 206
 207   return status == GL_FRAMEBUFFER_COMPLETE_EXT;
 208 }
 209
 210 void OpenGLUtils_FrameBuffer::release()
 211 {
 212   if( !IsEXTInitialized )
 213     return;
 214
 215   glDeleteTextures( 1, &textureId );
 216   textureId = 0;
 217
 218   vglDeleteFramebuffersEXT( 1, &fboId );
 219   fboId = 0;
 220
 221   vglDeleteRenderbuffersEXT( 1, &rboId );
 222   rboId = 0;
 223 }
 224
 225 void OpenGLUtils_FrameBuffer::bind()
 226 {
 227   if( !IsEXTInitialized )
 228     return;
 229
 230   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
 231 }
 232
 233 void OpenGLUtils_FrameBuffer::unbind()
 234 {
 235   if( !IsEXTInitialized )
 236     return;
 237
 238   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
 239 }