1 // Copyright (C) 2007-2014 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
23 #include "OpenGLUtils_FrameBuffer.h"
25 #include <utilities.h>
30 # ifndef GLX_GLXEXT_LEGACY
31 # define GLX_GLXEXT_LEGACY
43 #define APIENTRYP APIENTRY *
46 #ifndef GL_FRAMEBUFFER_EXT
47 #define GL_FRAMEBUFFER_EXT 0x8D40
50 #ifndef GL_RENDERBUFFER_EXT
51 #define GL_RENDERBUFFER_EXT 0x8D41
54 #ifndef GL_COLOR_ATTACHMENT0_EXT
55 #define GL_COLOR_ATTACHMENT0_EXT 0x8CE0
58 #ifndef GL_DEPTH_ATTACHMENT_EXT
59 #define GL_DEPTH_ATTACHMENT_EXT 0x8D00
62 #ifndef GL_FRAMEBUFFER_COMPLETE_EXT
63 #define GL_FRAMEBUFFER_COMPLETE_EXT 0x8CD5
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);
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;
89 #define GL_GetProcAddress( x ) glXGetProcAddressARB( (const GLubyte*)x )
91 #define GL_GetProcAddress( x ) wglGetProcAddress( (const LPCSTR)x )
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" );
107 bool ok = vglGenFramebuffersEXT && vglBindFramebufferEXT && vglFramebufferTexture2DEXT &&
108 vglCheckFramebufferStatusEXT && vglDeleteFramebuffersEXT && vglGenRenderbuffersEXT &&
109 vglBindRenderbufferEXT && vglRenderbufferStorageEXT && vglFramebufferRenderbufferEXT &&
110 vglDeleteRenderbuffersEXT;
115 static bool IsEXTInitialized = InitializeEXT();
117 OpenGLUtils_FrameBuffer::OpenGLUtils_FrameBuffer()
124 OpenGLUtils_FrameBuffer::~OpenGLUtils_FrameBuffer()
129 bool OpenGLUtils_FrameBuffer::init( const GLsizei& xSize, const GLsizei& ySize )
131 char* ext = (char*)glGetString( GL_EXTENSIONS );
132 if( !IsEXTInitialized ||
133 strstr( ext, "GL_EXT_framebuffer_object" ) == NULL )
135 MESSAGE( "Initializing OpenGL FrameBuffer extension failed" );
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 );
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 );
154 // create a framebuffer object
155 vglGenFramebuffersEXT( 1, &fboId );
156 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
158 // attach the texture to FBO color attachment point
159 vglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, textureId, 0 );
161 // attach the renderbuffer to depth attachment point
162 vglFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, rboId );
165 GLenum status = vglCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
168 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
170 return status == GL_FRAMEBUFFER_COMPLETE_EXT;
173 void OpenGLUtils_FrameBuffer::release()
175 if( !IsEXTInitialized )
178 glDeleteTextures( 1, &textureId );
181 vglDeleteFramebuffersEXT( 1, &fboId );
184 vglDeleteRenderbuffersEXT( 1, &rboId );
188 void OpenGLUtils_FrameBuffer::bind()
190 if( !IsEXTInitialized )
193 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
196 void OpenGLUtils_FrameBuffer::unbind()
198 if( !IsEXTInitialized )
201 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );