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lxdream.org :: lxdream/src/pvr2/glutil.c
lxdream 0.9.1
released Jun 29
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filename src/pvr2/glutil.c
changeset 736:a02d1475ccfd
prev700:4650d0c7f6f9
next1066:ddffe9d2b332
author nkeynes
date Thu Dec 11 21:33:08 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Only call finish_rendering() for texture renders - workaround bug in apple/intel drivers
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     1 /**
     2  * $Id$
     3  *
     4  * GL-based support functions 
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #include <string.h>
    20 #include <glib/gstrfuncs.h>
    21 #include "pvr2/glutil.h"
    23 gboolean isGLSecondaryColorSupported()
    24 {
    25     return isGLExtensionSupported("GL_EXT_secondary_color");
    26 }
    28 gboolean isGLVertexBufferSupported()
    29 {
    30     return isGLExtensionSupported("GL_ARB_vertex_buffer_object");
    31 }
    33 gboolean isGLPixelBufferSupported()
    34 {
    35     return isGLExtensionSupported("GL_ARB_pixel_buffer_object");
    36 }
    38 gboolean isGLMirroredTextureSupported()
    39 {
    40     return isGLExtensionSupported("GL_ARB_texture_mirrored_repeat");
    41 }
    43 /**
    44  * Test if a specific extension is supported. From opengl.org
    45  * @param extension extension name to check for
    46  * @return TRUE if supported, otherwise FALSE.
    47  */
    48 gboolean isGLExtensionSupported( const char *extension )
    49 {
    50     const GLubyte *extensions = NULL;
    51     const GLubyte *start;
    52     GLubyte *where, *terminator;
    54     /* Extension names should not have spaces. */
    55     where = (GLubyte *) strchr(extension, ' ');
    56     if (where || *extension == '\0')
    57         return 0;
    58     extensions = glGetString(GL_EXTENSIONS);
    59     if( extensions == NULL ) {
    60         /* No GL available, so we're pretty sure the extension isn't
    61          * available either. */
    62         return FALSE;
    63     }
    64     /* It takes a bit of care to be fool-proof about parsing the
    65        OpenGL extensions string. Don't be fooled by sub-strings,
    66        etc. */
    67     start = extensions;
    68     for (;;) {
    69         where = (GLubyte *) strstr((const char *) start, extension);
    70         if (!where)
    71             break;
    72         terminator = where + strlen(extension);
    73         if (where == start || *(where - 1) == ' ')
    74             if (*terminator == ' ' || *terminator == '\0')
    75                 return TRUE;
    76         start = terminator;
    77     }
    78     return FALSE;
    79 }
    81 void glPrintInfo( FILE *out )
    82 {
    83     const gchar *extensions = (const gchar *)glGetString(GL_EXTENSIONS);
    84     gchar **ext_split = g_strsplit(extensions, " ", 0);
    85     unsigned int i;
    87     fprintf( out, "GL Vendor: %s\n", glGetString(GL_VENDOR) );
    88     fprintf( out, "GL Renderer: %s\n", glGetString(GL_RENDERER) );
    89     fprintf( out, "GL Version: %s\n", glGetString(GL_VERSION) );
    91     fprintf( out, "Supported GL Extensions:\n" );
    92     for( i=0; ext_split[i] != NULL; i++ ) {
    93         fprintf( out, "  %s\n", ext_split[i] );
    94     }
    95     g_strfreev(ext_split);
    96 }
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