85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
|
/*
|
||
|
|
* This file can be build as a shared library and then used as an
|
||
|
|
* LD_PRELOAD to fake a system where NPOTs is not supported. It simply
|
||
|
|
* overrides glGetString and removes the extension strings.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <GL/gl.h>
|
||
|
|
#include <dlfcn.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <ctype.h>
|
||
|
|
|
||
|
|
typedef const GLubyte * (* GetStringFunc) (GLenum name);
|
||
|
|
|
||
|
|
static const char * const bad_strings[]
|
||
|
|
= { "GL_ARB_texture_non_power_of_two",
|
||
|
|
"GL_ARB_texture_rectangle",
|
||
|
|
"GL_EXT_texture_rectangle",
|
||
|
|
NULL };
|
||
|
|
|
||
|
|
const GLubyte *
|
||
|
|
glGetString (GLenum name)
|
||
|
|
{
|
||
|
|
const GLubyte *ret = NULL;
|
||
|
|
static void *gl_lib = NULL;
|
||
|
|
static GetStringFunc func = NULL;
|
||
|
|
static GLubyte *extensions = NULL;
|
||
|
|
|
||
|
|
if (gl_lib == NULL
|
||
|
|
&& (gl_lib = dlopen ("libGL.so", RTLD_LAZY)) == NULL)
|
||
|
|
fprintf (stderr, "dlopen: %s\n", dlerror ());
|
||
|
|
else if (func == NULL
|
||
|
|
&& (func = (GetStringFunc) dlsym (gl_lib, "glGetString")) == NULL)
|
||
|
|
fprintf (stderr, "dlsym: %s\n", dlerror ());
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ret = (* func) (name);
|
||
|
|
|
||
|
|
if (name == GL_EXTENSIONS)
|
||
|
|
{
|
||
|
|
if (extensions == NULL)
|
||
|
|
{
|
||
|
|
if ((extensions = (GLubyte *) strdup ((char *) ret)) == NULL)
|
||
|
|
fprintf (stderr, "strdup: %s\n", strerror (errno));
|
||
|
|
else
|
||
|
|
{
|
||
|
|
GLubyte *dst = extensions, *src = extensions;
|
||
|
|
|
||
|
|
while (1)
|
||
|
|
{
|
||
|
|
const char * const *str = bad_strings;
|
||
|
|
GLubyte *end;
|
||
|
|
|
||
|
|
while (isspace (*src))
|
||
|
|
*(dst++) = *(src++);
|
||
|
|
|
||
|
|
if (*src == 0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
for (end = src + 1; *end && !isspace (*end); end++);
|
||
|
|
|
||
|
|
while (*str && strncmp ((char *) src, *str, end - src))
|
||
|
|
str++;
|
||
|
|
|
||
|
|
if (*str == NULL)
|
||
|
|
{
|
||
|
|
memcpy (dst, src, end - src);
|
||
|
|
dst += end - src;
|
||
|
|
}
|
||
|
|
|
||
|
|
src = end;
|
||
|
|
}
|
||
|
|
|
||
|
|
*dst = '\0';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = extensions;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|