llgl.cpp

/** 
 * @file llgl.cpp
 * @brief LLGL implementation
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

// This file sets some global GL parameters, and implements some 
// useful functions for GL operations.

#define GLH_EXT_SINGLE_FILE

#include "linden_common.h"

#include "boost/tokenizer.hpp"

#include "llsys.h"

#include "llgl.h"
#include "llrender.h"

#include "llerror.h"
#include "llquaternion.h"
#include "llmath.h"
#include "m4math.h"
#include "llstring.h"

#include "llglheaders.h"

#ifdef _DEBUG
//#define GL_STATE_VERIFY
#endif

BOOL gDebugGL = FALSE;
BOOL gClothRipple = FALSE;
BOOL gNoRender = FALSE;
LLMatrix4 gGLObliqueProjectionInverse;

#define LL_GL_NAME_POOLING 0

LLGLNamePool::pool_list_t LLGLNamePool::sInstances;

#if (LL_WINDOWS || LL_LINUX) && !LL_MESA_HEADLESS
// ATI prototypes
// vertex blending prototypes
PFNGLWEIGHTPOINTERARBPROC			glWeightPointerARB = NULL;
PFNGLVERTEXBLENDARBPROC				glVertexBlendARB = NULL;
PFNGLWEIGHTFVARBPROC				glWeightfvARB = NULL;

// Vertex buffer object prototypes
PFNGLBINDBUFFERARBPROC				glBindBufferARB = NULL;
PFNGLDELETEBUFFERSARBPROC			glDeleteBuffersARB = NULL;
PFNGLGENBUFFERSARBPROC				glGenBuffersARB = NULL;
PFNGLISBUFFERARBPROC				glIsBufferARB = NULL;
PFNGLBUFFERDATAARBPROC				glBufferDataARB = NULL;
PFNGLBUFFERSUBDATAARBPROC			glBufferSubDataARB = NULL;
PFNGLGETBUFFERSUBDATAARBPROC		glGetBufferSubDataARB = NULL;
PFNGLMAPBUFFERARBPROC				glMapBufferARB = NULL;
PFNGLUNMAPBUFFERARBPROC				glUnmapBufferARB = NULL;
PFNGLGETBUFFERPARAMETERIVARBPROC	glGetBufferParameterivARB = NULL;
PFNGLGETBUFFERPOINTERVARBPROC		glGetBufferPointervARB = NULL;

// vertex object prototypes
PFNGLNEWOBJECTBUFFERATIPROC			glNewObjectBufferATI = NULL;
PFNGLISOBJECTBUFFERATIPROC			glIsObjectBufferATI = NULL;
PFNGLUPDATEOBJECTBUFFERATIPROC		glUpdateObjectBufferATI = NULL;
PFNGLGETOBJECTBUFFERFVATIPROC		glGetObjectBufferfvATI = NULL;
PFNGLGETOBJECTBUFFERIVATIPROC		glGetObjectBufferivATI = NULL;
PFNGLFREEOBJECTBUFFERATIPROC		glFreeObjectBufferATI = NULL;
PFNGLARRAYOBJECTATIPROC				glArrayObjectATI = NULL;
PFNGLVERTEXATTRIBARRAYOBJECTATIPROC	glVertexAttribArrayObjectATI = NULL;
PFNGLGETARRAYOBJECTFVATIPROC		glGetArrayObjectfvATI = NULL;
PFNGLGETARRAYOBJECTIVATIPROC		glGetArrayObjectivATI = NULL;
PFNGLVARIANTARRAYOBJECTATIPROC		glVariantObjectArrayATI = NULL;
PFNGLGETVARIANTARRAYOBJECTFVATIPROC	glGetVariantArrayObjectfvATI = NULL;
PFNGLGETVARIANTARRAYOBJECTIVATIPROC	glGetVariantArrayObjectivATI = NULL;

// GL_ARB_occlusion_query
PFNGLGENQUERIESARBPROC glGenQueriesARB = NULL;
PFNGLDELETEQUERIESARBPROC glDeleteQueriesARB = NULL;
PFNGLISQUERYARBPROC glIsQueryARB = NULL;
PFNGLBEGINQUERYARBPROC glBeginQueryARB = NULL;
PFNGLENDQUERYARBPROC glEndQueryARB = NULL;
PFNGLGETQUERYIVARBPROC glGetQueryivARB = NULL;
PFNGLGETQUERYOBJECTIVARBPROC glGetQueryObjectivARB = NULL;
PFNGLGETQUERYOBJECTUIVARBPROC glGetQueryObjectuivARB = NULL;

// GL_ARB_point_parameters
PFNGLPOINTPARAMETERFARBPROC glPointParameterfARB = NULL;
PFNGLPOINTPARAMETERFVARBPROC glPointParameterfvARB = NULL;

// GL_EXT_framebuffer_object
PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT = NULL;
PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT = NULL;
PFNGLDELETERENDERBUFFERSEXTPROC glDeleteRenderbuffersEXT = NULL;
PFNGLGENRENDERBUFFERSEXTPROC glGenRenderbuffersEXT = NULL;
PFNGLRENDERBUFFERSTORAGEEXTPROC glRenderbufferStorageEXT = NULL;
PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC glGetRenderbufferParameterivEXT = NULL;
PFNGLISFRAMEBUFFEREXTPROC glIsFramebufferEXT = NULL;
PFNGLBINDFRAMEBUFFEREXTPROC glBindFramebufferEXT = NULL;
PFNGLDELETEFRAMEBUFFERSEXTPROC glDeleteFramebuffersEXT = NULL;
PFNGLGENFRAMEBUFFERSEXTPROC glGenFramebuffersEXT = NULL;
PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT = NULL;
PFNGLFRAMEBUFFERTEXTURE1DEXTPROC glFramebufferTexture1DEXT = NULL;
PFNGLFRAMEBUFFERTEXTURE2DEXTPROC glFramebufferTexture2DEXT = NULL;
PFNGLFRAMEBUFFERTEXTURE3DEXTPROC glFramebufferTexture3DEXT = NULL;
PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC glFramebufferRenderbufferEXT = NULL;
PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC glGetFramebufferAttachmentParameterivEXT = NULL;
PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT = NULL;

//shader object prototypes
PFNGLDELETEOBJECTARBPROC glDeleteObjectARB = NULL;
PFNGLGETHANDLEARBPROC glGetHandleARB = NULL;
PFNGLDETACHOBJECTARBPROC glDetachObjectARB = NULL;
PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB = NULL;
PFNGLSHADERSOURCEARBPROC glShaderSourceARB = NULL;
PFNGLCOMPILESHADERARBPROC glCompileShaderARB = NULL;
PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB = NULL;
PFNGLATTACHOBJECTARBPROC glAttachObjectARB = NULL;
PFNGLLINKPROGRAMARBPROC glLinkProgramARB = NULL;
PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB = NULL;
PFNGLVALIDATEPROGRAMARBPROC glValidateProgramARB = NULL;
PFNGLUNIFORM1FARBPROC glUniform1fARB = NULL;
PFNGLUNIFORM2FARBPROC glUniform2fARB = NULL;
PFNGLUNIFORM3FARBPROC glUniform3fARB = NULL;
PFNGLUNIFORM4FARBPROC glUniform4fARB = NULL;
PFNGLUNIFORM1IARBPROC glUniform1iARB = NULL;
PFNGLUNIFORM2IARBPROC glUniform2iARB = NULL;
PFNGLUNIFORM3IARBPROC glUniform3iARB = NULL;
PFNGLUNIFORM4IARBPROC glUniform4iARB = NULL;
PFNGLUNIFORM1FVARBPROC glUniform1fvARB = NULL;
PFNGLUNIFORM2FVARBPROC glUniform2fvARB = NULL;
PFNGLUNIFORM3FVARBPROC glUniform3fvARB = NULL;
PFNGLUNIFORM4FVARBPROC glUniform4fvARB = NULL;
PFNGLUNIFORM1IVARBPROC glUniform1ivARB = NULL;
PFNGLUNIFORM2IVARBPROC glUniform2ivARB = NULL;
PFNGLUNIFORM3IVARBPROC glUniform3ivARB = NULL;
PFNGLUNIFORM4IVARBPROC glUniform4ivARB = NULL;
PFNGLUNIFORMMATRIX2FVARBPROC glUniformMatrix2fvARB = NULL;
PFNGLUNIFORMMATRIX3FVARBPROC glUniformMatrix3fvARB = NULL;
PFNGLUNIFORMMATRIX4FVARBPROC glUniformMatrix4fvARB = NULL;
PFNGLGETOBJECTPARAMETERFVARBPROC glGetObjectParameterfvARB = NULL;
PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameterivARB = NULL;
PFNGLGETINFOLOGARBPROC glGetInfoLogARB = NULL;
PFNGLGETATTACHEDOBJECTSARBPROC glGetAttachedObjectsARB = NULL;
PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB = NULL;
PFNGLGETACTIVEUNIFORMARBPROC glGetActiveUniformARB = NULL;
PFNGLGETUNIFORMFVARBPROC glGetUniformfvARB = NULL;
PFNGLGETUNIFORMIVARBPROC glGetUniformivARB = NULL;
PFNGLGETSHADERSOURCEARBPROC glGetShaderSourceARB = NULL;

// vertex shader prototypes
#if LL_LINUX
PFNGLVERTEXATTRIB1DARBPROC glVertexAttrib1dARB = NULL;
PFNGLVERTEXATTRIB1DVARBPROC glVertexAttrib1dvARB = NULL;
PFNGLVERTEXATTRIB1FARBPROC glVertexAttrib1fARB = NULL;
PFNGLVERTEXATTRIB1FVARBPROC glVertexAttrib1fvARB = NULL;
PFNGLVERTEXATTRIB1SARBPROC glVertexAttrib1sARB = NULL;
PFNGLVERTEXATTRIB1SVARBPROC glVertexAttrib1svARB = NULL;
PFNGLVERTEXATTRIB2DARBPROC glVertexAttrib2dARB = NULL;
PFNGLVERTEXATTRIB2DVARBPROC glVertexAttrib2dvARB = NULL;
PFNGLVERTEXATTRIB2FARBPROC glVertexAttrib2fARB = NULL;
PFNGLVERTEXATTRIB2FVARBPROC glVertexAttrib2fvARB = NULL;
PFNGLVERTEXATTRIB2SARBPROC glVertexAttrib2sARB = NULL;
PFNGLVERTEXATTRIB2SVARBPROC glVertexAttrib2svARB = NULL;
PFNGLVERTEXATTRIB3DARBPROC glVertexAttrib3dARB = NULL;
PFNGLVERTEXATTRIB3DVARBPROC glVertexAttrib3dvARB = NULL;
PFNGLVERTEXATTRIB3FARBPROC glVertexAttrib3fARB = NULL;
PFNGLVERTEXATTRIB3FVARBPROC glVertexAttrib3fvARB = NULL;
PFNGLVERTEXATTRIB3SARBPROC glVertexAttrib3sARB = NULL;
PFNGLVERTEXATTRIB3SVARBPROC glVertexAttrib3svARB = NULL;
#endif // LL_LINUX
PFNGLVERTEXATTRIB4NBVARBPROC glVertexAttrib4nbvARB = NULL;
PFNGLVERTEXATTRIB4NIVARBPROC glVertexAttrib4nivARB = NULL;
PFNGLVERTEXATTRIB4NSVARBPROC glVertexAttrib4nsvARB = NULL;
PFNGLVERTEXATTRIB4NUBARBPROC glVertexAttrib4nubARB = NULL;
PFNGLVERTEXATTRIB4NUBVARBPROC glVertexAttrib4nubvARB = NULL;
PFNGLVERTEXATTRIB4NUIVARBPROC glVertexAttrib4nuivARB = NULL;
PFNGLVERTEXATTRIB4NUSVARBPROC glVertexAttrib4nusvARB = NULL;
#if LL_LINUX
PFNGLVERTEXATTRIB4BVARBPROC glVertexAttrib4bvARB = NULL;
PFNGLVERTEXATTRIB4DARBPROC glVertexAttrib4dARB = NULL;
PFNGLVERTEXATTRIB4DVARBPROC glVertexAttrib4dvARB = NULL;
PFNGLVERTEXATTRIB4FARBPROC glVertexAttrib4fARB = NULL;
PFNGLVERTEXATTRIB4FVARBPROC glVertexAttrib4fvARB = NULL;
PFNGLVERTEXATTRIB4IVARBPROC glVertexAttrib4ivARB = NULL;
PFNGLVERTEXATTRIB4SARBPROC glVertexAttrib4sARB = NULL;
PFNGLVERTEXATTRIB4SVARBPROC glVertexAttrib4svARB = NULL;
PFNGLVERTEXATTRIB4UBVARBPROC glVertexAttrib4ubvARB = NULL;
PFNGLVERTEXATTRIB4UIVARBPROC glVertexAttrib4uivARB = NULL;
PFNGLVERTEXATTRIB4USVARBPROC glVertexAttrib4usvARB = NULL;
PFNGLVERTEXATTRIBPOINTERARBPROC glVertexAttribPointerARB = NULL;
PFNGLENABLEVERTEXATTRIBARRAYARBPROC glEnableVertexAttribArrayARB = NULL;
PFNGLDISABLEVERTEXATTRIBARRAYARBPROC glDisableVertexAttribArrayARB = NULL;
PFNGLPROGRAMSTRINGARBPROC glProgramStringARB = NULL;
PFNGLBINDPROGRAMARBPROC glBindProgramARB = NULL;
PFNGLDELETEPROGRAMSARBPROC glDeleteProgramsARB = NULL;
PFNGLGENPROGRAMSARBPROC glGenProgramsARB = NULL;
PFNGLPROGRAMENVPARAMETER4DARBPROC glProgramEnvParameter4dARB = NULL;
PFNGLPROGRAMENVPARAMETER4DVARBPROC glProgramEnvParameter4dvARB = NULL;
PFNGLPROGRAMENVPARAMETER4FARBPROC glProgramEnvParameter4fARB = NULL;
PFNGLPROGRAMENVPARAMETER4FVARBPROC glProgramEnvParameter4fvARB = NULL;
PFNGLPROGRAMLOCALPARAMETER4DARBPROC glProgramLocalParameter4dARB = NULL;
PFNGLPROGRAMLOCALPARAMETER4DVARBPROC glProgramLocalParameter4dvARB = NULL;
PFNGLPROGRAMLOCALPARAMETER4FARBPROC glProgramLocalParameter4fARB = NULL;
PFNGLPROGRAMLOCALPARAMETER4FVARBPROC glProgramLocalParameter4fvARB = NULL;
PFNGLGETPROGRAMENVPARAMETERDVARBPROC glGetProgramEnvParameterdvARB = NULL;
PFNGLGETPROGRAMENVPARAMETERFVARBPROC glGetProgramEnvParameterfvARB = NULL;
PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC glGetProgramLocalParameterdvARB = NULL;
PFNGLGETPROGRAMLOCALPARAMETERFVARBPROC glGetProgramLocalParameterfvARB = NULL;
PFNGLGETPROGRAMIVARBPROC glGetProgramivARB = NULL;
PFNGLGETPROGRAMSTRINGARBPROC glGetProgramStringARB = NULL;
PFNGLGETVERTEXATTRIBDVARBPROC glGetVertexAttribdvARB = NULL;
PFNGLGETVERTEXATTRIBFVARBPROC glGetVertexAttribfvARB = NULL;
PFNGLGETVERTEXATTRIBIVARBPROC glGetVertexAttribivARB = NULL;
PFNGLGETVERTEXATTRIBPOINTERVARBPROC glGetVertexAttribPointervARB = NULL;
PFNGLISPROGRAMARBPROC glIsProgramARB = NULL;
#endif // LL_LINUX
PFNGLBINDATTRIBLOCATIONARBPROC glBindAttribLocationARB = NULL;
PFNGLGETACTIVEATTRIBARBPROC glGetActiveAttribARB = NULL;
PFNGLGETATTRIBLOCATIONARBPROC glGetAttribLocationARB = NULL;

#if LL_WINDOWS
PFNWGLSWAPINTERVALEXTPROC			wglSwapIntervalEXT = NULL;
#endif

#if LL_LINUX
PFNGLCOLORTABLEEXTPROC glColorTableEXT = NULL;
#endif // LL_LINUX

#endif

LLGLManager gGLManager;

LLGLManager::LLGLManager() :
	mInited(FALSE),
	mIsDisabled(FALSE),

	mHasMultitexture(FALSE),
	mNumTextureUnits(1),
	mHasMipMapGeneration(FALSE),
	mHasCompressedTextures(FALSE),
	mHasFramebufferObject(FALSE),

	mHasVertexBufferObject(FALSE),
	mHasPBuffer(FALSE),
	mHasShaderObjects(FALSE),
	mHasVertexShader(FALSE),
	mHasFragmentShader(FALSE),
	mHasOcclusionQuery(FALSE),
	mHasPointParameters(FALSE),

	mHasAnisotropic(FALSE),
	mHasARBEnvCombine(FALSE),
	mHasCubeMap(FALSE),

	mIsATI(FALSE),
	mIsNVIDIA(FALSE),
	mIsIntel(FALSE),
	mIsGF2or4MX(FALSE),
	mIsGF3(FALSE),
	mIsGFFX(FALSE),
	mATIOffsetVerticalLines(FALSE),
	mATIOldDriver(FALSE),

	mHasRequirements(TRUE),

	mHasSeparateSpecularColor(FALSE),

	mDriverVersionMajor(1),
	mDriverVersionMinor(0),
	mDriverVersionRelease(0),
	mGLVersion(1.0f),
		
	mVRAM(0),
	mGLMaxVertexRange(0),
	mGLMaxIndexRange(0)
{
}

//---------------------------------------------------------------------
// Global initialization for GL
//---------------------------------------------------------------------
void LLGLManager::initWGL()
{
	mHasPBuffer = FALSE;
#if LL_WINDOWS && !LL_MESA_HEADLESS
	if (!glh_init_extensions("WGL_ARB_pixel_format"))
	{
		LL_WARNS("RenderInit") << "No ARB pixel format extensions" << LL_ENDL;
	}

	if (ExtensionExists("WGL_EXT_swap_control", gGLHExts.mSysExts))
	{
        GLH_EXT_NAME(wglSwapIntervalEXT) = (PFNWGLSWAPINTERVALEXTPROC)GLH_EXT_GET_PROC_ADDRESS("wglSwapIntervalEXT");
	}

	if( !glh_init_extensions("WGL_ARB_pbuffer") )
	{
		LL_WARNS("RenderInit") << "No ARB WGL PBuffer extensions" << LL_ENDL;
	}

	if( !glh_init_extensions("WGL_ARB_render_texture") )
	{
		LL_WARNS("RenderInit") << "No ARB WGL render texture extensions" << LL_ENDL;
	}

	mHasPBuffer = ExtensionExists("WGL_ARB_pbuffer", gGLHExts.mSysExts) &&
					ExtensionExists("WGL_ARB_render_texture", gGLHExts.mSysExts) &&
					ExtensionExists("WGL_ARB_pixel_format", gGLHExts.mSysExts);
#endif
}

// return false if unable (or unwilling due to old drivers) to init GL
bool LLGLManager::initGL()
{
	if (mInited)
	{
		LL_ERRS("RenderInit") << "Calling init on LLGLManager after already initialized!" << LL_ENDL;
	}

	GLint alpha_bits;
	glGetIntegerv( GL_ALPHA_BITS, &alpha_bits );
	if( 8 != alpha_bits )
	{
		LL_WARNS("RenderInit") << "Frame buffer has less than 8 bits of alpha.  Avatar texture compositing will fail." << LL_ENDL;
	}

	// Extract video card strings and convert to upper case to
	// work around driver-to-driver variation in capitalization.
	mGLVendor = std::string((const char *)glGetString(GL_VENDOR));
	LLStringUtil::toUpper(mGLVendor);

	mGLRenderer = std::string((const char *)glGetString(GL_RENDERER));
	LLStringUtil::toUpper(mGLRenderer);

	parse_gl_version( &mDriverVersionMajor, 
		&mDriverVersionMinor, 
		&mDriverVersionRelease, 
		&mDriverVersionVendorString );

	mGLVersion = mDriverVersionMajor + mDriverVersionMinor * .1f;
	
	// Trailing space necessary to keep "nVidia Corpor_ati_on" cards
	// from being recognized as ATI.
	if (mGLVendor.substr(0,4) == "ATI ")
	{
		mGLVendorShort = "ATI";
		BOOL mobile = FALSE;
		if (mGLRenderer.find("MOBILITY") != std::string::npos)
		{
			mobile = TRUE;
		}
		mIsATI = TRUE;

#if LL_WINDOWS && !LL_MESA_HEADLESS
		if (mDriverVersionRelease < 3842)
		{
			mATIOffsetVerticalLines = TRUE;
		}
#endif // LL_WINDOWS

#if (LL_WINDOWS || LL_LINUX) && !LL_MESA_HEADLESS
		// release 7277 is a point at which we verify that ATI OpenGL
		// drivers get pretty stable with SL, ~Catalyst 8.2,
		// for both Win32 and Linux.
		if (mDriverVersionRelease < 7277 &&
		    mDriverVersionRelease != 0) // 0 == Undetectable driver version - these get to pretend to be new ATI drivers, though that decision may be revisited.
		{
			mATIOldDriver = TRUE;
		}
#endif // (LL_WINDOWS || LL_LINUX) && !LL_MESA_HEADLESS
	}
	else if (mGLVendor.find("NVIDIA ") != std::string::npos)
	{
		mGLVendorShort = "NVIDIA";
		mIsNVIDIA = TRUE;
		if (   mGLRenderer.find("GEFORCE4 MX") != std::string::npos
			|| mGLRenderer.find("GEFORCE2") != std::string::npos
			|| mGLRenderer.find("GEFORCE 2") != std::string::npos
			|| mGLRenderer.find("GEFORCE4 460 GO") != std::string::npos
			|| mGLRenderer.find("GEFORCE4 440 GO") != std::string::npos
			|| mGLRenderer.find("GEFORCE4 420 GO") != std::string::npos)
		{
			mIsGF2or4MX = TRUE;
		}
		else if (mGLRenderer.find("GEFORCE FX") != std::string::npos
				 || mGLRenderer.find("QUADRO FX") != std::string::npos
				 || mGLRenderer.find("NV34") != std::string::npos)
		{
			mIsGFFX = TRUE;
		}
		else if(mGLRenderer.find("GEFORCE3") != std::string::npos)
		{
			mIsGF3 = TRUE;
		}

	}
	else if (mGLVendor.find("INTEL") != std::string::npos
#if LL_LINUX
		 // The Mesa-based drivers put this in the Renderer string,
		 // not the Vendor string.
		 || mGLRenderer.find("INTEL") != std::string::npos
#endif //LL_LINUX
		 )
	{
		mGLVendorShort = "INTEL";
		mIsIntel = TRUE;
	}
	else
	{
		mGLVendorShort = "MISC";
	}
	
	// This is called here because it depends on the setting of mIsGF2or4MX, and sets up mHasMultitexture.
	initExtensions();

	if (mHasMultitexture)
	{
		GLint num_tex_units;		
		glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &num_tex_units);
		mNumTextureUnits = llmin(num_tex_units, (GLint)MAX_GL_TEXTURE_UNITS);
		if (mIsIntel)
		{
			mNumTextureUnits = llmin(mNumTextureUnits, 2);
		}
	}
	else
	{
		mHasRequirements = FALSE;

		// We don't support cards that don't support the GL_ARB_multitexture extension
		LL_WARNS("RenderInit") << "GL Drivers do not support GL_ARB_multitexture" << LL_ENDL;
		return false;
	}
	

	initGLStates();
	return true;
}

void LLGLManager::getGLInfo(LLSD& info)
{
	info["GLInfo"]["GLVendor"] = std::string((const char *)glGetString(GL_VENDOR));
	info["GLInfo"]["GLRenderer"] = std::string((const char *)glGetString(GL_RENDERER));
	info["GLInfo"]["GLVersion"] = std::string((const char *)glGetString(GL_VERSION));

#if !LL_MESA_HEADLESS
	std::string all_exts = ll_safe_string((const char *)gGLHExts.mSysExts);
	boost::char_separator<char> sep(" ");
	boost::tokenizer<boost::char_separator<char> > tok(all_exts, sep);
	for(boost::tokenizer<boost::char_separator<char> >::iterator i = tok.begin(); i != tok.end(); ++i)
	{
		info["GLInfo"]["GLExtensions"].append(*i);
	}
#endif
}

std::string LLGLManager::getGLInfoString()
{
	std::string info_str;
	std::string all_exts, line;

	info_str += std::string("GL_VENDOR      ") + ll_safe_string((const char *)glGetString(GL_VENDOR)) + std::string("\n");
	info_str += std::string("GL_RENDERER    ") + ll_safe_string((const char *)glGetString(GL_RENDERER)) + std::string("\n");
	info_str += std::string("GL_VERSION     ") + ll_safe_string((const char *)glGetString(GL_VERSION)) + std::string("\n");

#if !LL_MESA_HEADLESS
	all_exts = (const char *)gGLHExts.mSysExts;
	LLStringUtil::replaceChar(all_exts, ' ', '\n');
	info_str += std::string("GL_EXTENSIONS:\n") + all_exts + std::string("\n");
#endif
	
	return info_str;
}

void LLGLManager::printGLInfoString()
{
	std::string info_str;
	std::string all_exts, line;
	
	LL_INFOS("RenderInit") << "GL_VENDOR:     " << ((const char *)glGetString(GL_VENDOR)) << LL_ENDL;
	LL_INFOS("RenderInit") << "GL_RENDERER:   " << ((const char *)glGetString(GL_RENDERER)) << LL_ENDL;
	LL_INFOS("RenderInit") << "GL_VERSION:    " << ((const char *)glGetString(GL_VERSION)) << LL_ENDL;

#if !LL_MESA_HEADLESS
	all_exts = std::string(gGLHExts.mSysExts);
	LLStringUtil::replaceChar(all_exts, ' ', '\n');
	LL_DEBUGS("RenderInit") << "GL_EXTENSIONS:\n" << all_exts << LL_ENDL;
#endif
}

std::string LLGLManager::getRawGLString()
{
	std::string gl_string;
	gl_string = ll_safe_string((char*)glGetString(GL_VENDOR)) + " " + ll_safe_string((char*)glGetString(GL_RENDERER));
	return gl_string;
}

void LLGLManager::shutdownGL()
{
	if (mInited)
	{
		glFinish();
		stop_glerror();
		mInited = FALSE;
	}
}

// these are used to turn software blending on. They appear in the Debug/Avatar menu
// presence of vertex skinning/blending or vertex programs will set these to FALSE by default.

extern LLCPUInfo gSysCPU;

void LLGLManager::initExtensions()
{
#if LL_MESA_HEADLESS
# if GL_ARB_multitexture
	mHasMultitexture = TRUE;
# else
	mHasMultitexture = FALSE;
# endif
# if GL_ARB_texture_env_combine
	mHasARBEnvCombine = TRUE;	
# else
	mHasARBEnvCombine = FALSE;
# endif
# if GL_ARB_texture_compression
	mHasCompressedTextures = TRUE;
# else
	mHasCompressedTextures = FALSE;
# endif
# if GL_ARB_vertex_buffer_object
	mHasVertexBufferObject = TRUE;
# else
	mHasVertexBufferObject = FALSE;
# endif
# if GL_EXT_framebuffer_object
	mHasFramebufferObject = TRUE;
# else
	mHasFramebufferObject = FALSE;
# endif
	mHasMipMapGeneration = FALSE;
	mHasSeparateSpecularColor = FALSE;
	mHasAnisotropic = FALSE;
	mHasCubeMap = FALSE;
	mHasOcclusionQuery = FALSE;
	mHasPointParameters = FALSE;
	mHasShaderObjects = FALSE;
	mHasVertexShader = FALSE;
	mHasFragmentShader = FALSE;
#else // LL_MESA_HEADLESS
	mHasMultitexture = glh_init_extensions("GL_ARB_multitexture");
	mHasMipMapGeneration = glh_init_extensions("GL_SGIS_generate_mipmap");
	mHasSeparateSpecularColor = glh_init_extensions("GL_EXT_separate_specular_color");
	mHasAnisotropic = glh_init_extensions("GL_EXT_texture_filter_anisotropic");
	glh_init_extensions("GL_ARB_texture_cube_map");
	mHasCubeMap = ExtensionExists("GL_ARB_texture_cube_map", gGLHExts.mSysExts);
	mHasARBEnvCombine = ExtensionExists("GL_ARB_texture_env_combine", gGLHExts.mSysExts);
	mHasCompressedTextures = glh_init_extensions("GL_ARB_texture_compression");
	mHasOcclusionQuery = ExtensionExists("GL_ARB_occlusion_query", gGLHExts.mSysExts);
	mHasVertexBufferObject = ExtensionExists("GL_ARB_vertex_buffer_object", gGLHExts.mSysExts);
	// mask out FBO support when packed_depth_stencil isn't there 'cause we need it for LLRenderTarget -Brad
	mHasFramebufferObject = ExtensionExists("GL_EXT_framebuffer_object", gGLHExts.mSysExts)
		&& ExtensionExists("GL_EXT_packed_depth_stencil", gGLHExts.mSysExts);
#if !LL_DARWIN
	mHasPointParameters = !mIsATI && ExtensionExists("GL_ARB_point_parameters", gGLHExts.mSysExts);
#endif
	mHasShaderObjects = ExtensionExists("GL_ARB_shader_objects", gGLHExts.mSysExts) && ExtensionExists("GL_ARB_shading_language_100", gGLHExts.mSysExts);
	mHasVertexShader = ExtensionExists("GL_ARB_vertex_program", gGLHExts.mSysExts) && ExtensionExists("GL_ARB_vertex_shader", gGLHExts.mSysExts)
						&& ExtensionExists("GL_ARB_shading_language_100", gGLHExts.mSysExts);
	mHasFragmentShader = ExtensionExists("GL_ARB_fragment_shader", gGLHExts.mSysExts) && ExtensionExists("GL_ARB_shading_language_100", gGLHExts.mSysExts);
#endif

#if LL_LINUX
	// Our extension support for the Linux Client is very young with some
	// potential driver gotchas, so offer a semi-secret way to turn it off.
	if (getenv("LL_GL_NOEXT"))	/* Flawfinder: ignore */
	{
		//mHasMultitexture = FALSE; // NEEDED!
		mHasARBEnvCombine = FALSE;
		mHasCompressedTextures = FALSE;
		mHasVertexBufferObject = FALSE;
		mHasFramebufferObject = FALSE;
		mHasMipMapGeneration = FALSE;
		mHasSeparateSpecularColor = FALSE;
		mHasAnisotropic = FALSE;
		mHasCubeMap = FALSE;
		mHasOcclusionQuery = FALSE;
		mHasPointParameters = FALSE;
		mHasShaderObjects = FALSE;
		mHasVertexShader = FALSE;
		mHasFragmentShader = FALSE;
		LL_WARNS("RenderInit") << "GL extension support DISABLED via LL_GL_NOEXT" << LL_ENDL;
	}
	else if (getenv("LL_GL_BASICEXT"))	/* Flawfinder: ignore */
	{
		// This switch attempts to turn off all support for exotic
		// extensions which I believe correspond to fatal driver
		// bug reports.  This should be the default until we get a
		// proper blacklist/whitelist on Linux.
		mHasMipMapGeneration = FALSE;
		mHasAnisotropic = FALSE;
		//mHasCubeMap = FALSE; // apparently fatal on Intel 915 & similar
		//mHasOcclusionQuery = FALSE; // source of many ATI system hangs
		mHasShaderObjects = FALSE;
		mHasVertexShader = FALSE;
		mHasFragmentShader = FALSE;
		LL_WARNS("RenderInit") << "GL extension support forced to SIMPLE level via LL_GL_BASICEXT" << LL_ENDL;
	}
	if (getenv("LL_GL_BLACKLIST"))	/* Flawfinder: ignore */
	{
		// This lets advanced troubleshooters disable specific
		// GL extensions to isolate problems with their hardware.
		// SL-28126
		const char *const blacklist = getenv("LL_GL_BLACKLIST");	/* Flawfinder: ignore */
		LL_WARNS("RenderInit") << "GL extension support partially disabled via LL_GL_BLACKLIST: " << blacklist << LL_ENDL;
		if (strchr(blacklist,'a')) mHasARBEnvCombine = FALSE;
		if (strchr(blacklist,'b')) mHasCompressedTextures = FALSE;
		if (strchr(blacklist,'c')) mHasVertexBufferObject = FALSE;
		if (strchr(blacklist,'d')) mHasMipMapGeneration = FALSE;//S
// 		if (strchr(blacklist,'f')) mHasNVVertexArrayRange = FALSE;//S
// 		if (strchr(blacklist,'g')) mHasNVFence = FALSE;//S
		if (strchr(blacklist,'h')) mHasSeparateSpecularColor = FALSE;
		if (strchr(blacklist,'i')) mHasAnisotropic = FALSE;//S
		if (strchr(blacklist,'j')) mHasCubeMap = FALSE;//S
// 		if (strchr(blacklist,'k')) mHasATIVAO = FALSE;//S
		if (strchr(blacklist,'l')) mHasOcclusionQuery = FALSE;
		if (strchr(blacklist,'m')) mHasShaderObjects = FALSE;//S
		if (strchr(blacklist,'n')) mHasVertexShader = FALSE;//S
		if (strchr(blacklist,'o')) mHasFragmentShader = FALSE;//S
		if (strchr(blacklist,'p')) mHasPointParameters = FALSE;//S
		if (strchr(blacklist,'q')) mHasFramebufferObject = FALSE;//S
	}
#endif // LL_LINUX
	
	if (!mHasMultitexture)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize multitexturing" << LL_ENDL;
	}
	if (!mHasMipMapGeneration)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize mipmap generation" << LL_ENDL;
	}
	if (!mHasARBEnvCombine)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_texture_env_combine" << LL_ENDL;
	}
	if (!mHasSeparateSpecularColor)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize separate specular color" << LL_ENDL;
	}
	if (!mHasAnisotropic)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize anisotropic filtering" << LL_ENDL;
	}
	if (!mHasCompressedTextures)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_texture_compression" << LL_ENDL;
	}
	if (!mHasOcclusionQuery)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_occlusion_query" << LL_ENDL;
	}
	if (!mHasPointParameters)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_point_parameters" << LL_ENDL;
	}
	if (!mHasShaderObjects)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_shader_objects" << LL_ENDL;
	}
	if (!mHasVertexShader)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_vertex_shader" << LL_ENDL;
	}
	if (!mHasFragmentShader)
	{
		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_fragment_shader" << LL_ENDL;
	}

	// Disable certain things due to known bugs
	if (mIsIntel && mHasMipMapGeneration)
	{
		LL_INFOS("RenderInit") << "Disabling mip-map generation for Intel GPUs" << LL_ENDL;
		mHasMipMapGeneration = FALSE;
	}
	if (mIsATI && mHasMipMapGeneration)
	{
		LL_INFOS("RenderInit") << "Disabling mip-map generation for ATI GPUs (performance opt)" << LL_ENDL;
		mHasMipMapGeneration = FALSE;
	}
	
	// Misc
	glGetIntegerv(GL_MAX_ELEMENTS_VERTICES, (GLint*) &mGLMaxVertexRange);
	glGetIntegerv(GL_MAX_ELEMENTS_INDICES, (GLint*) &mGLMaxIndexRange);
	
#if (LL_WINDOWS || LL_LINUX) && !LL_MESA_HEADLESS
	LL_DEBUGS("RenderInit") << "GL Probe: Getting symbols" << LL_ENDL;
	if (mHasVertexBufferObject)
	{
		glBindBufferARB = (PFNGLBINDBUFFERARBPROC)GLH_EXT_GET_PROC_ADDRESS("glBindBufferARB");
		if (glBindBufferARB)
		{
			glDeleteBuffersARB = (PFNGLDELETEBUFFERSARBPROC)GLH_EXT_GET_PROC_ADDRESS("glDeleteBuffersARB");
			glGenBuffersARB = (PFNGLGENBUFFERSARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGenBuffersARB");
			glIsBufferARB = (PFNGLISBUFFERARBPROC)GLH_EXT_GET_PROC_ADDRESS("glIsBufferARB");
			glBufferDataARB = (PFNGLBUFFERDATAARBPROC)GLH_EXT_GET_PROC_ADDRESS("glBufferDataARB");
			glBufferSubDataARB = (PFNGLBUFFERSUBDATAARBPROC)GLH_EXT_GET_PROC_ADDRESS("glBufferSubDataARB");
			glGetBufferSubDataARB = (PFNGLGETBUFFERSUBDATAARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGetBufferSubDataARB");
			glMapBufferARB = (PFNGLMAPBUFFERARBPROC)GLH_EXT_GET_PROC_ADDRESS("glMapBufferARB");
			glUnmapBufferARB = (PFNGLUNMAPBUFFERARBPROC)GLH_EXT_GET_PROC_ADDRESS("glUnmapBufferARB");
			glGetBufferParameterivARB = (PFNGLGETBUFFERPARAMETERIVARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGetBufferParameterivARB");
			glGetBufferPointervARB = (PFNGLGETBUFFERPOINTERVARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGetBufferPointervARB");
		}
		else
		{
			mHasVertexBufferObject = FALSE;
		}
	}
	if (mHasFramebufferObject)
	{
		glIsRenderbufferEXT = (PFNGLISRENDERBUFFEREXTPROC) GLH_EXT_GET_PROC_ADDRESS("glIsRenderbufferEXT");
		glBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC) GLH_EXT_GET_PROC_ADDRESS("glBindRenderbufferEXT");
		glDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glDeleteRenderbuffersEXT");
		glGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glGenRenderbuffersEXT");
		glRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glRenderbufferStorageEXT");
		glGetRenderbufferParameterivEXT = (PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glGetRenderbufferParameterivEXT");
		glIsFramebufferEXT = (PFNGLISFRAMEBUFFEREXTPROC) GLH_EXT_GET_PROC_ADDRESS("glIsFramebufferEXT");
		glBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC) GLH_EXT_GET_PROC_ADDRESS("glBindFramebufferEXT");
		glDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glDeleteFramebuffersEXT");
		glGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glGenFramebuffersEXT");
		glCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glCheckFramebufferStatusEXT");
		glFramebufferTexture1DEXT = (PFNGLFRAMEBUFFERTEXTURE1DEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glFramebufferTexture1DEXT");
		glFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glFramebufferTexture2DEXT");
		glFramebufferTexture3DEXT = (PFNGLFRAMEBUFFERTEXTURE3DEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glFramebufferTexture3DEXT");
		glFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC) GLH_EXT_GET_PROC_ADDRESS("glFramebufferRenderbufferEXT");
		glGetFramebufferAttachmentParameterivEXT = (PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glGetFramebufferAttachmentParameterivEXT");
		glGenerateMipmapEXT = (PFNGLGENERATEMIPMAPEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glGenerateMipmapEXT");
	}
#if !LL_LINUX
	// This is expected to be a static symbol on Linux GL implementations
	glDrawRangeElements = (PFNGLDRAWRANGEELEMENTSPROC)GLH_EXT_GET_PROC_ADDRESS("glDrawRangeElements");
	if (!glDrawRangeElements)
	{
		mGLMaxVertexRange = 0;
		mGLMaxIndexRange = 0;
	}
#endif // !LL_LINUX

	if (mHasOcclusionQuery)
	{
		glGenQueriesARB = (PFNGLGENQUERIESARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGenQueriesARB");
		glDeleteQueriesARB = (PFNGLDELETEQUERIESARBPROC)GLH_EXT_GET_PROC_ADDRESS("glDeleteQueriesARB");
		glIsQueryARB = (PFNGLISQUERYARBPROC)GLH_EXT_GET_PROC_ADDRESS("glIsQueryARB");
		glBeginQueryARB = (PFNGLBEGINQUERYARBPROC)GLH_EXT_GET_PROC_ADDRESS("glBeginQueryARB");
		glEndQueryARB = (PFNGLENDQUERYARBPROC)GLH_EXT_GET_PROC_ADDRESS("glEndQueryARB");
		glGetQueryivARB = (PFNGLGETQUERYIVARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGetQueryivARB");
		glGetQueryObjectivARB = (PFNGLGETQUERYOBJECTIVARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGetQueryObjectivARB");
		glGetQueryObjectuivARB = (PFNGLGETQUERYOBJECTUIVARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGetQueryObjectuivARB");
	}
	if (mHasPointParameters)
	{
		glPointParameterfARB = (PFNGLPOINTPARAMETERFARBPROC)GLH_EXT_GET_PROC_ADDRESS("glPointParameterfARB");
		glPointParameterfvARB = (PFNGLPOINTPARAMETERFVARBPROC)GLH_EXT_GET_PROC_ADDRESS("glPointParameterfvARB");
	}
	if (mHasShaderObjects)
	{
		glDeleteObjectARB = (PFNGLDELETEOBJECTARBPROC) GLH_EXT_GET_PROC_ADDRESS("glDeleteObjectARB");
		glGetHandleARB = (PFNGLGETHANDLEARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetHandleARB");
		glDetachObjectARB = (PFNGLDETACHOBJECTARBPROC) GLH_EXT_GET_PROC_ADDRESS("glDetachObjectARB");
		glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) GLH_EXT_GET_PROC_ADDRESS("glCreateShaderObjectARB");
		glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) GLH_EXT_GET_PROC_ADDRESS("glShaderSourceARB");
		glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) GLH_EXT_GET_PROC_ADDRESS("glCompileShaderARB");
		glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) GLH_EXT_GET_PROC_ADDRESS("glCreateProgramObjectARB");
		glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) GLH_EXT_GET_PROC_ADDRESS("glAttachObjectARB");
		glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) GLH_EXT_GET_PROC_ADDRESS("glLinkProgramARB");
		glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUseProgramObjectARB");
		glValidateProgramARB = (PFNGLVALIDATEPROGRAMARBPROC) GLH_EXT_GET_PROC_ADDRESS("glValidateProgramARB");
		glUniform1fARB = (PFNGLUNIFORM1FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform1fARB");
		glUniform2fARB = (PFNGLUNIFORM2FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform2fARB");
		glUniform3fARB = (PFNGLUNIFORM3FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform3fARB");
		glUniform4fARB = (PFNGLUNIFORM4FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform4fARB");
		glUniform1iARB = (PFNGLUNIFORM1IARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform1iARB");
		glUniform2iARB = (PFNGLUNIFORM2IARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform2iARB");
		glUniform3iARB = (PFNGLUNIFORM3IARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform3iARB");
		glUniform4iARB = (PFNGLUNIFORM4IARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform4iARB");
		glUniform1fvARB = (PFNGLUNIFORM1FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform1fvARB");
		glUniform2fvARB = (PFNGLUNIFORM2FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform2fvARB");
		glUniform3fvARB = (PFNGLUNIFORM3FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform3fvARB");
		glUniform4fvARB = (PFNGLUNIFORM4FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform4fvARB");
		glUniform1ivARB = (PFNGLUNIFORM1IVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform1ivARB");
		glUniform2ivARB = (PFNGLUNIFORM2IVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform2ivARB");
		glUniform3ivARB = (PFNGLUNIFORM3IVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform3ivARB");
		glUniform4ivARB = (PFNGLUNIFORM4IVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniform4ivARB");
		glUniformMatrix2fvARB = (PFNGLUNIFORMMATRIX2FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniformMatrix2fvARB");
		glUniformMatrix3fvARB = (PFNGLUNIFORMMATRIX3FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniformMatrix3fvARB");
		glUniformMatrix4fvARB = (PFNGLUNIFORMMATRIX4FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glUniformMatrix4fvARB");
		glGetObjectParameterfvARB = (PFNGLGETOBJECTPARAMETERFVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetObjectParameterfvARB");
		glGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetObjectParameterivARB");
		glGetInfoLogARB = (PFNGLGETINFOLOGARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetInfoLogARB");
		glGetAttachedObjectsARB = (PFNGLGETATTACHEDOBJECTSARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetAttachedObjectsARB");
		glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetUniformLocationARB");
		glGetActiveUniformARB = (PFNGLGETACTIVEUNIFORMARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetActiveUniformARB");
		glGetUniformfvARB = (PFNGLGETUNIFORMFVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetUniformfvARB");
		glGetUniformivARB = (PFNGLGETUNIFORMIVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetUniformivARB");
		glGetShaderSourceARB = (PFNGLGETSHADERSOURCEARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetShaderSourceARB");
	}
	if (mHasVertexShader)
	{
		glGetAttribLocationARB = (PFNGLGETATTRIBLOCATIONARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetAttribLocationARB");
		glBindAttribLocationARB = (PFNGLBINDATTRIBLOCATIONARBPROC) GLH_EXT_GET_PROC_ADDRESS("glBindAttribLocationARB");
		glGetActiveAttribARB = (PFNGLGETACTIVEATTRIBARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetActiveAttribARB");
		glVertexAttrib1dARB = (PFNGLVERTEXATTRIB1DARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib1dARB");
		glVertexAttrib1dvARB = (PFNGLVERTEXATTRIB1DVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib1dvARB");
		glVertexAttrib1fARB = (PFNGLVERTEXATTRIB1FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib1fARB");
		glVertexAttrib1fvARB = (PFNGLVERTEXATTRIB1FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib1fvARB");
		glVertexAttrib1sARB = (PFNGLVERTEXATTRIB1SARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib1sARB");
		glVertexAttrib1svARB = (PFNGLVERTEXATTRIB1SVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib1svARB");
		glVertexAttrib2dARB = (PFNGLVERTEXATTRIB2DARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib2dARB");
		glVertexAttrib2dvARB = (PFNGLVERTEXATTRIB2DVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib2dvARB");
		glVertexAttrib2fARB = (PFNGLVERTEXATTRIB2FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib2fARB");
		glVertexAttrib2fvARB = (PFNGLVERTEXATTRIB2FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib2fvARB");
		glVertexAttrib2sARB = (PFNGLVERTEXATTRIB2SARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib2sARB");
		glVertexAttrib2svARB = (PFNGLVERTEXATTRIB2SVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib2svARB");
		glVertexAttrib3dARB = (PFNGLVERTEXATTRIB3DARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib3dARB");
		glVertexAttrib3dvARB = (PFNGLVERTEXATTRIB3DVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib3dvARB");
		glVertexAttrib3fARB = (PFNGLVERTEXATTRIB3FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib3fARB");
		glVertexAttrib3fvARB = (PFNGLVERTEXATTRIB3FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib3fvARB");
		glVertexAttrib3sARB = (PFNGLVERTEXATTRIB3SARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib3sARB");
		glVertexAttrib3svARB = (PFNGLVERTEXATTRIB3SVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib3svARB");
		glVertexAttrib4nbvARB = (PFNGLVERTEXATTRIB4NBVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4nbvARB");
		glVertexAttrib4nivARB = (PFNGLVERTEXATTRIB4NIVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4nivARB");
		glVertexAttrib4nsvARB = (PFNGLVERTEXATTRIB4NSVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4nsvARB");
		glVertexAttrib4nubARB = (PFNGLVERTEXATTRIB4NUBARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4nubARB");
		glVertexAttrib4nubvARB = (PFNGLVERTEXATTRIB4NUBVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4nubvARB");
		glVertexAttrib4nuivARB = (PFNGLVERTEXATTRIB4NUIVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4nuivARB");
		glVertexAttrib4nusvARB = (PFNGLVERTEXATTRIB4NUSVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4nusvARB");
		glVertexAttrib4bvARB = (PFNGLVERTEXATTRIB4BVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4bvARB");
		glVertexAttrib4dARB = (PFNGLVERTEXATTRIB4DARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4dARB");
		glVertexAttrib4dvARB = (PFNGLVERTEXATTRIB4DVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4dvARB");
		glVertexAttrib4fARB = (PFNGLVERTEXATTRIB4FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4fARB");
		glVertexAttrib4fvARB = (PFNGLVERTEXATTRIB4FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4fvARB");
		glVertexAttrib4ivARB = (PFNGLVERTEXATTRIB4IVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4ivARB");
		glVertexAttrib4sARB = (PFNGLVERTEXATTRIB4SARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4sARB");
		glVertexAttrib4svARB = (PFNGLVERTEXATTRIB4SVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4svARB");
		glVertexAttrib4ubvARB = (PFNGLVERTEXATTRIB4UBVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4ubvARB");
		glVertexAttrib4uivARB = (PFNGLVERTEXATTRIB4UIVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4uivARB");
		glVertexAttrib4usvARB = (PFNGLVERTEXATTRIB4USVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib4usvARB");
		glVertexAttribPointerARB = (PFNGLVERTEXATTRIBPOINTERARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttribPointerARB");
		glEnableVertexAttribArrayARB = (PFNGLENABLEVERTEXATTRIBARRAYARBPROC) GLH_EXT_GET_PROC_ADDRESS("glEnableVertexAttribArrayARB");
		glDisableVertexAttribArrayARB = (PFNGLDISABLEVERTEXATTRIBARRAYARBPROC) GLH_EXT_GET_PROC_ADDRESS("glDisableVertexAttribArrayARB");
		glProgramStringARB = (PFNGLPROGRAMSTRINGARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramStringARB");
		glBindProgramARB = (PFNGLBINDPROGRAMARBPROC) GLH_EXT_GET_PROC_ADDRESS("glBindProgramARB");
		glDeleteProgramsARB = (PFNGLDELETEPROGRAMSARBPROC) GLH_EXT_GET_PROC_ADDRESS("glDeleteProgramsARB");
		glGenProgramsARB = (PFNGLGENPROGRAMSARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGenProgramsARB");
		glProgramEnvParameter4dARB = (PFNGLPROGRAMENVPARAMETER4DARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramEnvParameter4dARB");
		glProgramEnvParameter4dvARB = (PFNGLPROGRAMENVPARAMETER4DVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramEnvParameter4dvARB");
		glProgramEnvParameter4fARB = (PFNGLPROGRAMENVPARAMETER4FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramEnvParameter4fARB");
		glProgramEnvParameter4fvARB = (PFNGLPROGRAMENVPARAMETER4FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramEnvParameter4fvARB");
		glProgramLocalParameter4dARB = (PFNGLPROGRAMLOCALPARAMETER4DARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramLocalParameter4dARB");
		glProgramLocalParameter4dvARB = (PFNGLPROGRAMLOCALPARAMETER4DVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramLocalParameter4dvARB");
		glProgramLocalParameter4fARB = (PFNGLPROGRAMLOCALPARAMETER4FARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramLocalParameter4fARB");
		glProgramLocalParameter4fvARB = (PFNGLPROGRAMLOCALPARAMETER4FVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glProgramLocalParameter4fvARB");
		glGetProgramEnvParameterdvARB = (PFNGLGETPROGRAMENVPARAMETERDVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetProgramEnvParameterdvARB");
		glGetProgramEnvParameterfvARB = (PFNGLGETPROGRAMENVPARAMETERFVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetProgramEnvParameterfvARB");
		glGetProgramLocalParameterdvARB = (PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetProgramLocalParameterdvARB");
		glGetProgramLocalParameterfvARB = (PFNGLGETPROGRAMLOCALPARAMETERFVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetProgramLocalParameterfvARB");
		glGetProgramivARB = (PFNGLGETPROGRAMIVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetProgramivARB");
		glGetProgramStringARB = (PFNGLGETPROGRAMSTRINGARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetProgramStringARB");
		glGetVertexAttribdvARB = (PFNGLGETVERTEXATTRIBDVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetVertexAttribdvARB");
		glGetVertexAttribfvARB = (PFNGLGETVERTEXATTRIBFVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetVertexAttribfvARB");
		glGetVertexAttribivARB = (PFNGLGETVERTEXATTRIBIVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetVertexAttribivARB");
		glGetVertexAttribPointervARB = (PFNGLGETVERTEXATTRIBPOINTERVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glgetVertexAttribPointervARB");
		glIsProgramARB = (PFNGLISPROGRAMARBPROC) GLH_EXT_GET_PROC_ADDRESS("glIsProgramARB");
	}
	LL_DEBUGS("RenderInit") << "GL Probe: Got symbols" << LL_ENDL;
#endif

	mInited = TRUE;
}

void rotate_quat(LLQuaternion& rotation)
{
	F32 angle_radians, x, y, z;
	rotation.getAngleAxis(&angle_radians, &x, &y, &z);
	glRotatef(angle_radians * RAD_TO_DEG, x, y, z);
}

void flush_glerror()
{
	glGetError();
}

void assert_glerror()
{
	if (gNoRender || !gDebugGL) 
	{
		return;
	}
	if (!gGLManager.mInited)
	{
		LL_ERRS("RenderInit") << "GL not initialized" << LL_ENDL;
	}
	//  Create or update texture to be used with this data 
	GLenum error;
	error = glGetError();
	BOOL quit = FALSE;
	while (error)
	{
		quit = TRUE;
#ifndef LL_LINUX // *FIX: !  This should be an error for linux as well.
		GLubyte const * gl_error_msg = gluErrorString(error);
		if (NULL != gl_error_msg)
		{
			LL_WARNS("RenderState") << "GL Error:" << error<< LL_ENDL;
			LL_WARNS("RenderState") << "GL Error String:" << gl_error_msg << LL_ENDL;
		}
		else
		{
			// gluErrorString returns NULL for some extensions' error codes.
			// you'll probably have to grep for the number in glext.h.
			LL_WARNS("RenderState") << "GL Error: UNKNOWN 0x" << std::hex << error << LL_ENDL;
		}
		error = glGetError();
#endif
	}

	if (quit)
	{
		llerrs << "One or more unhandled GL errors." << llendl;
	}
}

void clear_glerror()
{
	//  Create or update texture to be used with this data 
	GLenum error;
	error = glGetError();
}

///////////////////////////////////////////////////////////////
//
// LLGLState
//

// Static members
std::map<LLGLenum, LLGLboolean> LLGLState::sStateMap;

GLboolean LLGLDepthTest::sDepthEnabled = GL_FALSE; // OpenGL default
GLenum LLGLDepthTest::sDepthFunc = GL_LESS; // OpenGL default
GLboolean LLGLDepthTest::sWriteEnabled = GL_TRUE; // OpenGL default

//static
void LLGLState::initClass() 
{
	sStateMap[GL_DITHER] = GL_TRUE;
	// sStateMap[GL_TEXTURE_2D] = GL_TRUE;
	
	//make sure multisample defaults to disabled
	sStateMap[GL_MULTISAMPLE_ARB] = GL_FALSE;
	glDisable(GL_MULTISAMPLE_ARB);
}

//static
void LLGLState::restoreGL()
{
	sStateMap.clear();
	initClass();
}

//static
// Really shouldn't be needed, but seems we sometimes do.
void LLGLState::resetTextureStates()
{