--- /dev/null
+// Copyright (C) 2007-2010 CEA/DEN, EDF R&D, OPEN CASCADE
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+
+// File : GLViewer_FrameBuffer.cxx
+// Module : SALOME
+//
+#include "GLViewer_FrameBuffer.h"
+
+#include <cstring>
+
+#ifndef WNT
+# ifndef GLX_GLXEXT_LEGACY
+# define GLX_GLXEXT_LEGACY
+# endif
+# include <GL/glx.h>
+# include <dlfcn.h>
+#else
+# include <wingdi.h>
+#endif
+
+#ifndef APIENTRY
+#define APIENTRY
+#endif
+#ifndef APIENTRYP
+#define APIENTRYP APIENTRY *
+#endif
+
+#ifndef GL_FRAMEBUFFER_EXT
+#define GL_FRAMEBUFFER_EXT 0x8D40
+#endif
+
+#ifndef GL_RENDERBUFFER_EXT
+#define GL_RENDERBUFFER_EXT 0x8D41
+#endif
+
+#ifndef GL_COLOR_ATTACHMENT0_EXT
+#define GL_COLOR_ATTACHMENT0_EXT 0x8CE0
+#endif
+
+#ifndef GL_DEPTH_ATTACHMENT_EXT
+#define GL_DEPTH_ATTACHMENT_EXT 0x8D00
+#endif
+
+#ifndef GL_FRAMEBUFFER_COMPLETE_EXT
+#define GL_FRAMEBUFFER_COMPLETE_EXT 0x8CD5
+#endif
+
+typedef void (APIENTRYP PFNGLGENFRAMEBUFFERSEXTPROC) (GLsizei n, GLuint *framebuffers);
+typedef void (APIENTRYP PFNGLBINDFRAMEBUFFEREXTPROC) (GLenum target, GLuint framebuffer);
+typedef void (APIENTRYP PFNGLFRAMEBUFFERTEXTURE2DEXTPROC) (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
+typedef GLenum (APIENTRYP PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC) (GLenum target);
+typedef void (APIENTRYP PFNGLDELETEFRAMEBUFFERSEXTPROC) (GLsizei n, const GLuint *framebuffers);
+typedef void (APIENTRYP PFNGLGENRENDERBUFFERSEXTPROC) (GLsizei n, GLuint *renderbuffers);
+typedef void (APIENTRYP PFNGLBINDRENDERBUFFEREXTPROC) (GLenum target, GLuint renderbuffer);
+typedef void (APIENTRYP PFNGLRENDERBUFFERSTORAGEEXTPROC) (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
+typedef void (APIENTRYP PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC) (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
+typedef void (APIENTRYP PFNGLDELETERENDERBUFFERSEXTPROC) (GLsizei n, const GLuint *renderbuffers);
+
+static PFNGLGENFRAMEBUFFERSEXTPROC vglGenFramebuffersEXT = NULL;
+static PFNGLBINDFRAMEBUFFEREXTPROC vglBindFramebufferEXT = NULL;
+static PFNGLFRAMEBUFFERTEXTURE2DEXTPROC vglFramebufferTexture2DEXT = NULL;
+static PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC vglCheckFramebufferStatusEXT = NULL;
+static PFNGLDELETEFRAMEBUFFERSEXTPROC vglDeleteFramebuffersEXT = NULL;
+static PFNGLGENRENDERBUFFERSEXTPROC vglGenRenderbuffersEXT = NULL;
+static PFNGLBINDRENDERBUFFEREXTPROC vglBindRenderbufferEXT = NULL;
+static PFNGLRENDERBUFFERSTORAGEEXTPROC vglRenderbufferStorageEXT = NULL;
+static PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC vglFramebufferRenderbufferEXT = NULL;
+static PFNGLDELETERENDERBUFFERSEXTPROC vglDeleteRenderbuffersEXT = NULL;
+
+#ifndef WNT
+#define GL_GetProcAddress( x ) glXGetProcAddressARB( (const GLubyte*)x )
+#else
+#define GL_GetProcAddress( x ) wglGetProcAddress( (const LPCSTR)x )
+#endif
+
+bool InitializeEXT()
+{
+ vglGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glGenFramebuffersEXT" );
+ vglBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)GL_GetProcAddress( "glBindFramebufferEXT" );
+ vglFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)GL_GetProcAddress( "glFramebufferTexture2DEXT" );
+ vglCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)GL_GetProcAddress( "glCheckFramebufferStatusEXT" );
+ vglDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteFramebuffersEXT" );
+ vglGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)GL_GetProcAddress( "glGenRenderbuffersEXT" );
+ vglBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)GL_GetProcAddress( "glBindRenderbufferEXT" );
+ vglRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)GL_GetProcAddress( "glRenderbufferStorageEXT" );
+ vglFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)GL_GetProcAddress( "glFramebufferRenderbufferEXT" );
+ vglDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)GL_GetProcAddress( "glDeleteRenderbuffersEXT" );
+
+ bool ok = vglGenFramebuffersEXT && vglBindFramebufferEXT && vglFramebufferTexture2DEXT &&
+ vglCheckFramebufferStatusEXT && vglDeleteFramebuffersEXT && vglGenRenderbuffersEXT &&
+ vglBindRenderbufferEXT && vglRenderbufferStorageEXT && vglFramebufferRenderbufferEXT &&
+ vglDeleteRenderbuffersEXT;
+
+ return ok;
+}
+
+GLViewer_FrameBuffer::GLViewer_FrameBuffer()
+ : textureId( 0 ),
+ fboId( 0 ),
+ rboId( 0 ),
+ myIsInitializeEXT ( false )
+{
+}
+
+GLViewer_FrameBuffer::~GLViewer_FrameBuffer()
+{
+ release();
+}
+
+bool GLViewer_FrameBuffer::init( const GLsizei& xSize, const GLsizei& ySize )
+{
+ myIsInitializeEXT = InitializeEXT();
+ char* ext = (char*)glGetString( GL_EXTENSIONS );
+ if( !myIsInitializeEXT || strstr( ext, "GL_EXT_framebuffer_object" ) == NULL )
+ return false;
+
+ // create a texture object
+ glEnable( GL_TEXTURE_2D );
+ glGenTextures( 1, &textureId );
+ glBindTexture( GL_TEXTURE_2D, textureId );
+ glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
+ glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+ glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, xSize, ySize, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL );
+ glBindTexture( GL_TEXTURE_2D, 0 );
+
+ // create a renderbuffer object to store depth info
+ vglGenRenderbuffersEXT( 1, &rboId );
+ vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, rboId );
+ vglRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, xSize, ySize );
+ vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, 0 );
+
+ // create a framebuffer object
+ vglGenFramebuffersEXT( 1, &fboId );
+ vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
+
+ // attach the texture to FBO color attachment point
+ vglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, textureId, 0 );
+
+ // attach the renderbuffer to depth attachment point
+ vglFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, rboId );
+
+ // check FBO status
+ GLenum status = vglCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
+
+ // Unbind FBO
+ vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
+
+ return status == GL_FRAMEBUFFER_COMPLETE_EXT;
+}
+
+void GLViewer_FrameBuffer::release()
+{
+ if( !myIsInitializeEXT )
+ return;
+
+ glDeleteTextures( 1, &textureId );
+ textureId = 0;
+
+ vglDeleteFramebuffersEXT( 1, &fboId );
+ fboId = 0;
+
+ vglDeleteRenderbuffersEXT( 1, &rboId );
+ rboId = 0;
+}
+
+void GLViewer_FrameBuffer::bind()
+{
+ if( !myIsInitializeEXT )
+ return;
+
+ vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId );
+}
+
+void GLViewer_FrameBuffer::unbind()
+{
+ if( !myIsInitializeEXT )
+ return;
+
+ vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
+}
