1 // Copyright (C) 2007-2016 CEA/DEN, EDF R&D, OPEN CASCADE
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.
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.
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
17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
20 // File : OpenGLUtils_FrameBuffer.cxx
24 #define GL_GLEXT_PROTOTYPES
28 #include "OpenGLUtils_FrameBuffer.h"
30 #include <utilities.h>
35 # ifndef GLX_GLXEXT_LEGACY
36 # define GLX_GLXEXT_LEGACY
39 #import <mach-o/dyld.h>
42 void * glXGetProcAddressARB (const GLubyte *name)
47 symbolName = (char *)malloc (strlen ((const char *)name) + 2); // 1
48 strcpy(symbolName + 1, (const char *)name); // 2
49 symbolName[0] = '_'; // 3
51 if (NSIsSymbolNameDefined (symbolName)) // 4
52 symbol = NSLookupAndBindSymbol (symbolName);
53 free (symbolName); // 5
54 return symbol ? NSAddressOfSymbol (symbol) : NULL; // 6
68 #define APIENTRYP APIENTRY *
71 #ifndef GL_FRAMEBUFFER_EXT
72 #define GL_FRAMEBUFFER_EXT 0x8D40
75 #ifndef GL_RENDERBUFFER_EXT
76 #define GL_RENDERBUFFER_EXT 0x8D41
79 #ifndef GL_COLOR_ATTACHMENT0_EXT
80 #define GL_COLOR_ATTACHMENT0_EXT 0x8CE0
83 #ifndef GL_DEPTH_ATTACHMENT_EXT
84 #define GL_DEPTH_ATTACHMENT_EXT 0x8D00
87 #ifndef GL_FRAMEBUFFER_COMPLETE_EXT
88 #define GL_FRAMEBUFFER_COMPLETE_EXT 0x8CD5
91 typedef void (APIENTRYP PFNGLGENFRAMEBUFFERSEXTPROC) (GLsizei n, GLuint *framebuffers);
92 typedef void (APIENTRYP PFNGLBINDFRAMEBUFFEREXTPROC) (GLenum target, GLuint framebuffer);
93 typedef void (APIENTRYP PFNGLFRAMEBUFFERTEXTURE2DEXTPROC) (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
94 typedef GLenum (APIENTRYP PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC) (GLenum target);
95 typedef void (APIENTRYP PFNGLDELETEFRAMEBUFFERSEXTPROC) (GLsizei n, const GLuint *framebuffers);
96 typedef void (APIENTRYP PFNGLGENRENDERBUFFERSEXTPROC) (GLsizei n, GLuint *renderbuffers);
97 typedef void (APIENTRYP PFNGLBINDRENDERBUFFEREXTPROC) (GLenum target, GLuint renderbuffer);
98 typedef void (APIENTRYP PFNGLRENDERBUFFERSTORAGEEXTPROC) (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
99 typedef void (APIENTRYP PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC) (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
100 typedef void (APIENTRYP PFNGLDELETERENDERBUFFERSEXTPROC) (GLsizei n, const GLuint *renderbuffers);
102 static PFNGLGENFRAMEBUFFERSEXTPROC vglGenFramebuffersEXT = NULL;
103 static PFNGLBINDFRAMEBUFFEREXTPROC vglBindFramebufferEXT = NULL;
104 static PFNGLFRAMEBUFFERTEXTURE2DEXTPROC vglFramebufferTexture2DEXT = NULL;
105 static PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC vglCheckFramebufferStatusEXT = NULL;
106 static PFNGLDELETEFRAMEBUFFERSEXTPROC vglDeleteFramebuffersEXT = NULL;
107 static PFNGLGENRENDERBUFFERSEXTPROC vglGenRenderbuffersEXT = NULL;
108 static PFNGLBINDRENDERBUFFEREXTPROC vglBindRenderbufferEXT = NULL;
109 static PFNGLRENDERBUFFERSTORAGEEXTPROC vglRenderbufferStorageEXT = NULL;
110 static PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC vglFramebufferRenderbufferEXT = NULL;
111 static PFNGLDELETERENDERBUFFERSEXTPROC vglDeleteRenderbuffersEXT = NULL;
114 #define GL_GetProcAddress( x ) glXGetProcAddressARB( (const GLubyte*)x )
116 #define GL_GetProcAddress( x ) wglGetProcAddress( (const LPCSTR)x )
121 vglGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glGenFramebuffersEXT" );
122 vglBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)GL_GetProcAddress( "glBindFramebufferEXT" );
123 vglFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)GL_GetProcAddress( "glFramebufferTexture2DEXT" );
124 vglCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)GL_GetProcAddress( "glCheckFramebufferStatusEXT" );
125 vglDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteFramebuffersEXT" );
126 vglGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)GL_GetProcAddress( "glGenRenderbuffersEXT" );
127 vglBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)GL_GetProcAddress( "glBindRenderbufferEXT" );
128 vglRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)GL_GetProcAddress( "glRenderbufferStorageEXT" );
129 vglFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)GL_GetProcAddress( "glFramebufferRenderbufferEXT" );
130 vglDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteRenderbuffersEXT" );
132 bool ok = vglGenFramebuffersEXT && vglBindFramebufferEXT && vglFramebufferTexture2DEXT &&
133 vglCheckFramebufferStatusEXT && vglDeleteFramebuffersEXT && vglGenRenderbuffersEXT &&
134 vglBindRenderbufferEXT && vglRenderbufferStorageEXT && vglFramebufferRenderbufferEXT &&
135 vglDeleteRenderbuffersEXT;
140 static bool IsEXTInitialized = InitializeEXT();
142 OpenGLUtils_FrameBuffer::OpenGLUtils_FrameBuffer()
149 OpenGLUtils_FrameBuffer::~OpenGLUtils_FrameBuffer()
154 bool OpenGLUtils_FrameBuffer::init( const GLsizei& xSize, const GLsizei& ySize )
156 #if defined(VTK_OPENGL2) && ! defined(WIN32)
158 std::ostringstream strm;
159 glGetIntegerv(GL_NUM_EXTENSIONS, &n);
160 for (int i = 0; i < n; i++)
162 const char *exti = (const char *)glGetStringi(GL_EXTENSIONS, i);
165 std::string s = strm.str();
166 const char* ext = s.c_str();
168 char* ext = (char*)glGetString( GL_EXTENSIONS );
170 if( !IsEXTInitialized || !ext ||
171 strstr( ext, "GL_EXT_framebuffer_object" ) == NULL )
173 MESSAGE( "Initializing OpenGL FrameBuffer extension failed" );
177 // create a texture object
178 glEnable( GL_TEXTURE_2D );
179 glGenTextures( 1, &textureId );
180 glBindTexture( GL_TEXTURE_2D, textureId );
181 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
182 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
183 glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, xSize, ySize, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL );
184 glBindTexture( GL_TEXTURE_2D, 0 );
186 // create a renderbuffer object to store depth info
187 vglGenRenderbuffersEXT( 1, &rboId );
188 vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, rboId );
189 vglRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, xSize, ySize );
190 vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, 0 );
192 // create a framebuffer object
193 vglGenFramebuffersEXT( 1, &fboId );
194 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
196 // attach the texture to FBO color attachment point
197 vglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, textureId, 0 );
199 // attach the renderbuffer to depth attachment point
200 vglFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, rboId );
203 GLenum status = vglCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
206 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
208 return status == GL_FRAMEBUFFER_COMPLETE_EXT;
211 void OpenGLUtils_FrameBuffer::release()
213 if( !IsEXTInitialized )
216 glDeleteTextures( 1, &textureId );
219 vglDeleteFramebuffersEXT( 1, &fboId );
222 vglDeleteRenderbuffersEXT( 1, &rboId );
226 void OpenGLUtils_FrameBuffer::bind()
228 if( !IsEXTInitialized )
231 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
234 void OpenGLUtils_FrameBuffer::unbind()
236 if( !IsEXTInitialized )
239 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );