Use system glext headers on linux

Delete extra glh_extension files from llwindow

indra/cmake/GLEXT.cmake

@@ -2,9 +2,9 @@
 include(Prebuilt)
 
 if (NOT USESYSTEMLIBS)
-  if (WINDOWS OR LINUX)
+  if (WINDOWS)
     use_prebuilt_binary(glext)
-  endif (WINDOWS OR LINUX)
+  endif (WINDOWS)
   use_prebuilt_binary(glh_linear)
   set(GLEXT_INCLUDE_DIR ${LIBS_PREBUILT_DIR}/include)
 endif (NOT USESYSTEMLIBS)

indra/llwindow/GL/glh_extensions.h

-/*
- *  glh_extensions.h
- * $LicenseInfo:firstyear=2006&license=mit$ (mit used here to satisfy validity checker)
- * Copyright (C) 2006, NVIDIA
- *  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."
- * $/LicenseInfo$
-
- */
-
-#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) {
-			free(padExtName);
-			return FALSE;
-		} else {
-			free(padExtName);
-			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 */