nkeynes@653: /**
nkeynes@653:  * $Id$
nkeynes@653:  *
nkeynes@653:  * GL-based support functions 
nkeynes@653:  *
nkeynes@653:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@653:  *
nkeynes@653:  * This program is free software; you can redistribute it and/or modify
nkeynes@653:  * it under the terms of the GNU General Public License as published by
nkeynes@653:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@653:  * (at your option) any later version.
nkeynes@653:  *
nkeynes@653:  * This program is distributed in the hope that it will be useful,
nkeynes@653:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@653:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@653:  * GNU General Public License for more details.
nkeynes@653:  */
nkeynes@736: 
nkeynes@653: #include <string.h>
nkeynes@687: #include <glib/gstrfuncs.h>
nkeynes@653: #include "pvr2/glutil.h"
nkeynes@653: 
nkeynes@667: gboolean isGLSecondaryColorSupported()
nkeynes@667: {
nkeynes@736:     return isGLExtensionSupported("GL_EXT_secondary_color");
nkeynes@667: }
nkeynes@667: 
nkeynes@667: gboolean isGLVertexBufferSupported()
nkeynes@667: {
nkeynes@736:     return isGLExtensionSupported("GL_ARB_vertex_buffer_object");
nkeynes@667: }
nkeynes@667: 
nkeynes@667: gboolean isGLPixelBufferSupported()
nkeynes@667: {
nkeynes@736:     return isGLExtensionSupported("GL_ARB_pixel_buffer_object");
nkeynes@667: }
nkeynes@667: 
nkeynes@667: gboolean isGLMirroredTextureSupported()
nkeynes@667: {
nkeynes@736:     return isGLExtensionSupported("GL_ARB_texture_mirrored_repeat");
nkeynes@667: }
nkeynes@667: 
nkeynes@653: /**
nkeynes@653:  * Test if a specific extension is supported. From opengl.org
nkeynes@653:  * @param extension extension name to check for
nkeynes@653:  * @return TRUE if supported, otherwise FALSE.
nkeynes@653:  */
nkeynes@653: gboolean isGLExtensionSupported( const char *extension )
nkeynes@653: {
nkeynes@653:     const GLubyte *extensions = NULL;
nkeynes@653:     const GLubyte *start;
nkeynes@653:     GLubyte *where, *terminator;
nkeynes@653: 
nkeynes@653:     /* Extension names should not have spaces. */
nkeynes@653:     where = (GLubyte *) strchr(extension, ' ');
nkeynes@653:     if (where || *extension == '\0')
nkeynes@736:         return 0;
nkeynes@653:     extensions = glGetString(GL_EXTENSIONS);
nkeynes@653:     if( extensions == NULL ) {
nkeynes@736:         /* No GL available, so we're pretty sure the extension isn't
nkeynes@736:          * available either. */
nkeynes@736:         return FALSE;
nkeynes@653:     }
nkeynes@653:     /* It takes a bit of care to be fool-proof about parsing the
nkeynes@653:        OpenGL extensions string. Don't be fooled by sub-strings,
nkeynes@653:        etc. */
nkeynes@653:     start = extensions;
nkeynes@653:     for (;;) {
nkeynes@736:         where = (GLubyte *) strstr((const char *) start, extension);
nkeynes@736:         if (!where)
nkeynes@736:             break;
nkeynes@736:         terminator = where + strlen(extension);
nkeynes@736:         if (where == start || *(where - 1) == ' ')
nkeynes@736:             if (*terminator == ' ' || *terminator == '\0')
nkeynes@736:                 return TRUE;
nkeynes@736:         start = terminator;
nkeynes@653:     }
nkeynes@653:     return FALSE;
nkeynes@653: }
nkeynes@687: 
nkeynes@687: void glPrintInfo( FILE *out )
nkeynes@687: {
nkeynes@700:     const gchar *extensions = (const gchar *)glGetString(GL_EXTENSIONS);
nkeynes@687:     gchar **ext_split = g_strsplit(extensions, " ", 0);
nkeynes@687:     unsigned int i;
nkeynes@736: 
nkeynes@687:     fprintf( out, "GL Vendor: %s\n", glGetString(GL_VENDOR) );
nkeynes@687:     fprintf( out, "GL Renderer: %s\n", glGetString(GL_RENDERER) );
nkeynes@687:     fprintf( out, "GL Version: %s\n", glGetString(GL_VERSION) );
nkeynes@736: 
nkeynes@687:     fprintf( out, "Supported GL Extensions:\n" );
nkeynes@687:     for( i=0; ext_split[i] != NULL; i++ ) {
nkeynes@687:         fprintf( out, "  %s\n", ext_split[i] );
nkeynes@687:     }
nkeynes@687:     g_strfreev(ext_split);
nkeynes@687: }