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
27 #include "OpenGLUtils_FrameBuffer.h"
29 #include <utilities.h>
34 # ifndef GLX_GLXEXT_LEGACY
35 # define GLX_GLXEXT_LEGACY
47 #define APIENTRYP APIENTRY *
50 #ifndef GL_FRAMEBUFFER_EXT
51 #define GL_FRAMEBUFFER_EXT 0x8D40
54 #ifndef GL_RENDERBUFFER_EXT
55 #define GL_RENDERBUFFER_EXT 0x8D41
58 #ifndef GL_COLOR_ATTACHMENT0_EXT
59 #define GL_COLOR_ATTACHMENT0_EXT 0x8CE0
62 #ifndef GL_DEPTH_ATTACHMENT_EXT
63 #define GL_DEPTH_ATTACHMENT_EXT 0x8D00
66 #ifndef GL_FRAMEBUFFER_COMPLETE_EXT
67 #define GL_FRAMEBUFFER_COMPLETE_EXT 0x8CD5
70 typedef void (APIENTRYP PFNGLGENFRAMEBUFFERSEXTPROC) (GLsizei n, GLuint *framebuffers);
71 typedef void (APIENTRYP PFNGLBINDFRAMEBUFFEREXTPROC) (GLenum target, GLuint framebuffer);
72 typedef void (APIENTRYP PFNGLFRAMEBUFFERTEXTURE2DEXTPROC) (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
73 typedef GLenum (APIENTRYP PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC) (GLenum target);
74 typedef void (APIENTRYP PFNGLDELETEFRAMEBUFFERSEXTPROC) (GLsizei n, const GLuint *framebuffers);
75 typedef void (APIENTRYP PFNGLGENRENDERBUFFERSEXTPROC) (GLsizei n, GLuint *renderbuffers);
76 typedef void (APIENTRYP PFNGLBINDRENDERBUFFEREXTPROC) (GLenum target, GLuint renderbuffer);
77 typedef void (APIENTRYP PFNGLRENDERBUFFERSTORAGEEXTPROC) (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
78 typedef void (APIENTRYP PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC) (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
79 typedef void (APIENTRYP PFNGLDELETERENDERBUFFERSEXTPROC) (GLsizei n, const GLuint *renderbuffers);
81 static PFNGLGENFRAMEBUFFERSEXTPROC vglGenFramebuffersEXT = NULL;
82 static PFNGLBINDFRAMEBUFFEREXTPROC vglBindFramebufferEXT = NULL;
83 static PFNGLFRAMEBUFFERTEXTURE2DEXTPROC vglFramebufferTexture2DEXT = NULL;
84 static PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC vglCheckFramebufferStatusEXT = NULL;
85 static PFNGLDELETEFRAMEBUFFERSEXTPROC vglDeleteFramebuffersEXT = NULL;
86 static PFNGLGENRENDERBUFFERSEXTPROC vglGenRenderbuffersEXT = NULL;
87 static PFNGLBINDRENDERBUFFEREXTPROC vglBindRenderbufferEXT = NULL;
88 static PFNGLRENDERBUFFERSTORAGEEXTPROC vglRenderbufferStorageEXT = NULL;
89 static PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC vglFramebufferRenderbufferEXT = NULL;
90 static PFNGLDELETERENDERBUFFERSEXTPROC vglDeleteRenderbuffersEXT = NULL;
93 #define GL_GetProcAddress( x ) glXGetProcAddressARB( (const GLubyte*)x )
95 #define GL_GetProcAddress( x ) wglGetProcAddress( (const LPCSTR)x )
100 vglGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glGenFramebuffersEXT" );
101 vglBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)GL_GetProcAddress( "glBindFramebufferEXT" );
102 vglFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)GL_GetProcAddress( "glFramebufferTexture2DEXT" );
103 vglCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)GL_GetProcAddress( "glCheckFramebufferStatusEXT" );
104 vglDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteFramebuffersEXT" );
105 vglGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)GL_GetProcAddress( "glGenRenderbuffersEXT" );
106 vglBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)GL_GetProcAddress( "glBindRenderbufferEXT" );
107 vglRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)GL_GetProcAddress( "glRenderbufferStorageEXT" );
108 vglFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)GL_GetProcAddress( "glFramebufferRenderbufferEXT" );
109 vglDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteRenderbuffersEXT" );
111 bool ok = vglGenFramebuffersEXT && vglBindFramebufferEXT && vglFramebufferTexture2DEXT &&
112 vglCheckFramebufferStatusEXT && vglDeleteFramebuffersEXT && vglGenRenderbuffersEXT &&
113 vglBindRenderbufferEXT && vglRenderbufferStorageEXT && vglFramebufferRenderbufferEXT &&
114 vglDeleteRenderbuffersEXT;
119 static bool IsEXTInitialized = InitializeEXT();
121 OpenGLUtils_FrameBuffer::OpenGLUtils_FrameBuffer()
128 OpenGLUtils_FrameBuffer::~OpenGLUtils_FrameBuffer()
133 bool OpenGLUtils_FrameBuffer::init( const GLsizei& xSize, const GLsizei& ySize )
137 std::ostringstream strm;
138 glGetIntegerv(GL_NUM_EXTENSIONS, &n);
139 for (int i = 0; i < n; i++)
141 const char *exti = (const char *)glGetStringi(GL_EXTENSIONS, i);
144 std::string s = strm.str();
145 const char* ext = s.c_str();
147 char* ext = (char*)glGetString( GL_EXTENSIONS );
149 if( !IsEXTInitialized || !ext ||
150 strstr( ext, "GL_EXT_framebuffer_object" ) == NULL )
152 MESSAGE( "Initializing OpenGL FrameBuffer extension failed" );
156 // create a texture object
157 glEnable( GL_TEXTURE_2D );
158 glGenTextures( 1, &textureId );
159 glBindTexture( GL_TEXTURE_2D, textureId );
160 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
161 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
162 glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, xSize, ySize, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL );
163 glBindTexture( GL_TEXTURE_2D, 0 );
165 // create a renderbuffer object to store depth info
166 vglGenRenderbuffersEXT( 1, &rboId );
167 vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, rboId );
168 vglRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, xSize, ySize );
169 vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, 0 );
171 // create a framebuffer object
172 vglGenFramebuffersEXT( 1, &fboId );
173 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
175 // attach the texture to FBO color attachment point
176 vglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, textureId, 0 );
178 // attach the renderbuffer to depth attachment point
179 vglFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, rboId );
182 GLenum status = vglCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
185 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
187 return status == GL_FRAMEBUFFER_COMPLETE_EXT;
190 void OpenGLUtils_FrameBuffer::release()
192 if( !IsEXTInitialized )
195 glDeleteTextures( 1, &textureId );
198 vglDeleteFramebuffersEXT( 1, &fboId );
201 vglDeleteRenderbuffersEXT( 1, &rboId );
205 void OpenGLUtils_FrameBuffer::bind()
207 if( !IsEXTInitialized )
210 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
213 void OpenGLUtils_FrameBuffer::unbind()
215 if( !IsEXTInitialized )
218 vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );