Search
lxdream.org :: lxdream/src/pvr2/glutil.c
lxdream 0.9.1
released Jun 29
Download Now
filename src/pvr2/glutil.c
changeset 667:0e1ac8da75d9
prev653:3202ff01d48e
next687:6bdc2b7032ea
author nkeynes
date Sat Apr 19 02:39:37 2008 +0000 (13 years ago)
permissions -rw-r--r--
last change Centralize gl ext checks in glutil.c
file annotate diff log raw
nkeynes@653
     1
/**
nkeynes@653
     2
 * $Id$
nkeynes@653
     3
 *
nkeynes@653
     4
 * GL-based support functions 
nkeynes@653
     5
 *
nkeynes@653
     6
 * Copyright (c) 2005 Nathan Keynes.
nkeynes@653
     7
 *
nkeynes@653
     8
 * This program is free software; you can redistribute it and/or modify
nkeynes@653
     9
 * it under the terms of the GNU General Public License as published by
nkeynes@653
    10
 * the Free Software Foundation; either version 2 of the License, or
nkeynes@653
    11
 * (at your option) any later version.
nkeynes@653
    12
 *
nkeynes@653
    13
 * This program is distributed in the hope that it will be useful,
nkeynes@653
    14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@653
    15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@653
    16
 * GNU General Public License for more details.
nkeynes@653
    17
 */
nkeynes@653
    18
#include <string.h>
nkeynes@653
    19
#include "pvr2/glutil.h"
nkeynes@653
    20
nkeynes@667
    21
gboolean isGLSecondaryColorSupported()
nkeynes@667
    22
{
nkeynes@667
    23
	return isGLExtensionSupported("GL_EXT_secondary_color");
nkeynes@667
    24
}
nkeynes@667
    25
nkeynes@667
    26
gboolean isGLVertexBufferSupported()
nkeynes@667
    27
{
nkeynes@667
    28
	return isGLExtensionSupported("GL_ARB_vertex_buffer_object");
nkeynes@667
    29
}
nkeynes@667
    30
nkeynes@667
    31
gboolean isGLPixelBufferSupported()
nkeynes@667
    32
{
nkeynes@667
    33
	return isGLExtensionSupported("GL_ARB_pixel_buffer_object");
nkeynes@667
    34
}
nkeynes@667
    35
nkeynes@667
    36
gboolean isGLMirroredTextureSupported()
nkeynes@667
    37
{
nkeynes@667
    38
	return isGLExtensionSupported("GL_ARB_texture_mirrored_repeat");
nkeynes@667
    39
}
nkeynes@667
    40
nkeynes@653
    41
/**
nkeynes@653
    42
 * Test if a specific extension is supported. From opengl.org
nkeynes@653
    43
 * @param extension extension name to check for
nkeynes@653
    44
 * @return TRUE if supported, otherwise FALSE.
nkeynes@653
    45
 */
nkeynes@653
    46
gboolean isGLExtensionSupported( const char *extension )
nkeynes@653
    47
{
nkeynes@653
    48
    const GLubyte *extensions = NULL;
nkeynes@653
    49
    const GLubyte *start;
nkeynes@653
    50
    GLubyte *where, *terminator;
nkeynes@653
    51
nkeynes@653
    52
    /* Extension names should not have spaces. */
nkeynes@653
    53
    where = (GLubyte *) strchr(extension, ' ');
nkeynes@653
    54
    if (where || *extension == '\0')
nkeynes@653
    55
	return 0;
nkeynes@653
    56
    extensions = glGetString(GL_EXTENSIONS);
nkeynes@653
    57
    if( extensions == NULL ) {
nkeynes@653
    58
	/* No GL available, so we're pretty sure the extension isn't
nkeynes@653
    59
	 * available either. */
nkeynes@653
    60
	return FALSE;
nkeynes@653
    61
    }
nkeynes@653
    62
    /* It takes a bit of care to be fool-proof about parsing the
nkeynes@653
    63
       OpenGL extensions string. Don't be fooled by sub-strings,
nkeynes@653
    64
       etc. */
nkeynes@653
    65
    start = extensions;
nkeynes@653
    66
    for (;;) {
nkeynes@653
    67
	where = (GLubyte *) strstr((const char *) start, extension);
nkeynes@653
    68
	if (!where)
nkeynes@653
    69
	    break;
nkeynes@653
    70
	terminator = where + strlen(extension);
nkeynes@653
    71
	if (where == start || *(where - 1) == ' ')
nkeynes@653
    72
	    if (*terminator == ' ' || *terminator == '\0')
nkeynes@653
    73
		return TRUE;
nkeynes@653
    74
	start = terminator;
nkeynes@653
    75
    }
nkeynes@653
    76
    return FALSE;
nkeynes@653
    77
}
.