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/*
* glh_extensions.h
* From nVidia Corporation, downloaded 2006-12-18 from:
* http://developer.nvidia.com/attach/8196
* ("NVParse Library with Source (.zip) (2390 KB)")
*
* License (quoted from license_info.txt in aforementioned file):
* "The files bison.exe, bison.simple, and flex.exe are covered by
* the GPL. All other files in this distribution can be used however
* you want."
*/
#ifndef GLH_EXTENSIONS
#define GLH_EXTENSIONS
#include <string.h>
#include <stdio.h>
#ifdef _WIN32
# include <windows.h>
#endif
#ifndef __APPLE__
#include <GL/gl.h>
#endif
#ifdef _WIN32
# include "GL/wglext.h"
#endif
#define CHECK_MEMORY(ptr) \
if (NULL == ptr) { \
printf("Error allocating memory in file %s, line %d\n", __FILE__, __LINE__); \
exit(-1); \
}
#ifdef GLH_EXT_SINGLE_FILE
# define GLH_EXTENSIONS_SINGLE_FILE // have to do this because glh_genext.h unsets GLH_EXT_SINGLE_FILE
#endif
#include "glh_genext.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifdef GLH_EXTENSIONS_SINGLE_FILE
class GLHExts
{
public:
GLHExts()
{
mSysExts = NULL;
// mUnsupportedExts = NULL;
}
~GLHExts()
{
if (mSysExts)
{
free(mSysExts);
}
// if (mUnsupportedExts)
// {
// free(mUnsupportedExts);
// }
}
char *mSysExts;
// char *mUnsupportedExts;
};
GLHExts gGLHExts;
static int ExtensionExists(const char* extName, const char* sysExts)
{
char *padExtName = (char*)malloc(strlen(extName) + 2);
strcat(strcpy(padExtName, extName), " ");
if (0 == strcmp(extName, "GL_VERSION_1_2")) {
const char *version = (const char*)glGetString(GL_VERSION);
if (strstr(version, "1.0") == version || strstr(version, "1.1") == version) {
return FALSE;
} else {
return TRUE;
}
}
if (strstr(sysExts, padExtName)) {
free(padExtName);
return TRUE;
} else {
free(padExtName);
return FALSE;
}
}
static const char* EatWhiteSpace(const char *str)
{
for (; *str && (' ' == *str || '\t' == *str || '\n' == *str); str++);
return str;
}
static const char* EatNonWhiteSpace(const char *str)
{
for (; *str && (' ' != *str && '\t' != *str && '\n' != *str); str++);
return str;
}
int glh_init_extensions(const char *origReqExts)
{
// Length of requested extensions string
unsigned reqExtsLen;
char *reqExts;
// Ptr for individual extensions within reqExts
char *reqExt;
int success = TRUE;
// build space-padded extension string
if (NULL == gGLHExts.mSysExts) {
const char *extensions = (const char*)glGetString(GL_EXTENSIONS);
int sysExtsLen = (int)strlen(extensions);
const char *winsys_extensions = 0;
int winsysExtsLen = 0;
#ifdef _WIN32
{
PFNWGLGETEXTENSIONSSTRINGARBPROC wglGetExtensionsStringARB = 0;
wglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)wglGetProcAddress("wglGetExtensionsStringARB");
if(wglGetExtensionsStringARB)
{
winsys_extensions = wglGetExtensionsStringARB(wglGetCurrentDC());
winsysExtsLen = (S32)strlen(winsys_extensions);
}
}
#endif
// Add 2 bytes, one for padding space, one for terminating NULL
gGLHExts.mSysExts = (char*)malloc(sysExtsLen + winsysExtsLen + 3);
CHECK_MEMORY(gGLHExts.mSysExts);
strcpy(gGLHExts.mSysExts, extensions);
gGLHExts.mSysExts[sysExtsLen] = ' ';
gGLHExts.mSysExts[sysExtsLen + 1] = 0;
if (winsysExtsLen)
{
strcat(gGLHExts.mSysExts, winsys_extensions);
}
gGLHExts.mSysExts[sysExtsLen + 1 + winsysExtsLen] = ' ';
gGLHExts.mSysExts[sysExtsLen + 1 + winsysExtsLen + 1] = 0;
}
if (NULL == origReqExts)
{
return TRUE;
}
reqExts = strdup(origReqExts);
reqExtsLen = (S32)strlen(reqExts);
/*
if (NULL == gGLHExts.mUnsupportedExts)
{
gGLHExts.mUnsupportedExts = (char*)malloc(reqExtsLen + 1);
}
else if (reqExtsLen > strlen(gGLHExts.mUnsupportedExts))
{
gGLHExts.mUnsupportedExts = (char*)realloc(gGLHExts.mUnsupportedExts, reqExtsLen + 1);
}
CHECK_MEMORY(gGLHExts.mUnsupportedExts);
*gGLHExts.mUnsupportedExts = 0;
*/
// Parse requested extension list
for (reqExt = reqExts;
(reqExt = (char*)EatWhiteSpace(reqExt)) && *reqExt;
reqExt = (char*)EatNonWhiteSpace(reqExt))
{
char *extEnd = (char*)EatNonWhiteSpace(reqExt);
char saveChar = *extEnd;
*extEnd = (char)0;
if (!ExtensionExists(reqExt, gGLHExts.mSysExts) ||
!glh_init_extension(reqExt)) {
/*
// add reqExt to end of unsupportedExts
strcat(gGLHExts.mUnsupportedExts, reqExt);
strcat(gGLHExts.mUnsupportedExts, " ");
*/
success = FALSE;
}
*extEnd = saveChar;
}
free(reqExts);
return success;
}
const char* glh_get_unsupported_extensions()
{
return "";
// return (const char*)gGLHExts.mUnsupportedExts;
}
#else
int glh_init_extensions(const char *origReqExts);
const char* glh_get_unsupported_extensions();
#endif /* GLH_EXT_SINGLE_FILE */
#ifdef __cplusplus
}
#endif
#endif /* GLH_EXTENSIONS */
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