llgl.cpp

/** 
 * @file llgl.cpp
 * @brief LLGL implementation
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

// 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 "llglstates.h"
#include "llrender.h"

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

#include "llglheaders.h"
#include "llglslshader.h"

#if LL_WINDOWS
#include "lldxhardware.h"
#endif

#ifdef _DEBUG
//#define GL_STATE_VERIFY
#endif


BOOL gDebugSession = FALSE;
BOOL gClothRipple = FALSE;
BOOL gHeadlessClient = FALSE;
BOOL gGLActive = FALSE;
BOOL gGLDebugLoggingEnabled = TRUE;

static const std::string HEADLESS_VENDOR_STRING("Linden Lab");
static const std::string HEADLESS_RENDERER_STRING("Headless");
static const std::string HEADLESS_VERSION_STRING("1.0");

llofstream gFailLog;

#if GL_ARB_debug_output

#ifndef APIENTRY
#define APIENTRY
#endif

void APIENTRY gl_debug_callback(GLenum source,
                                GLenum type,
                                GLuint id,
                                GLenum severity,
                                GLsizei length,
                                const GLchar* message,
                                GLvoid* userParam)
{
	if (gGLDebugLoggingEnabled)
	{
	if (severity == GL_DEBUG_SEVERITY_HIGH_ARB)
	{
		LL_WARNS() << "----- GL ERROR --------" << LL_ENDL;
	}
	else
	{
		LL_WARNS() << "----- GL WARNING -------" << LL_ENDL;
	}
	LL_WARNS() << "Type: " << std::hex << type << LL_ENDL;
	LL_WARNS() << "ID: " << std::hex << id << LL_ENDL;
	LL_WARNS() << "Severity: " << std::hex << severity << LL_ENDL;
	LL_WARNS() << "Message: " << message << LL_ENDL;
	LL_WARNS() << "-----------------------" << LL_ENDL;
	if (severity == GL_DEBUG_SEVERITY_HIGH_ARB)
	{
		LL_ERRS() << "Halting on GL Error" << LL_ENDL;
	}
}
}
#endif

void parse_glsl_version(S32& major, S32& minor);

void ll_init_fail_log(std::string filename)
{
	gFailLog.open(filename.c_str());
}


void ll_fail(std::string msg)
{
	
	if (gDebugSession)
	{
		std::vector<std::string> lines;

		gFailLog << LLError::utcTime() << " " << msg << std::endl;

		gFailLog << "Stack Trace:" << std::endl;

		ll_get_stack_trace(lines);
		
		for(size_t i = 0; i < lines.size(); ++i)
		{
			gFailLog << lines[i] << std::endl;
		}

		gFailLog << "End of Stack Trace." << std::endl << std::endl;

		gFailLog.flush();
	}
};

void ll_close_fail_log()
{
	gFailLog.close();
}

LLMatrix4 gGLObliqueProjectionInverse;

#define LL_GL_NAME_POOLING 0

std::list<LLGLUpdate*> LLGLUpdate::sGLQ;

#if (LL_WINDOWS || LL_LINUX || LL_SOLARIS)  && !LL_MESA_HEADLESS
// ATI prototypes

#if LL_WINDOWS
PFNGLGETSTRINGIPROC glGetStringi = NULL;
#endif

// 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;

//GL_ARB_vertex_array_object
PFNGLBINDVERTEXARRAYPROC glBindVertexArray = NULL;
PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays = NULL;
PFNGLGENVERTEXARRAYSPROC glGenVertexArrays = NULL;
PFNGLISVERTEXARRAYPROC glIsVertexArray = NULL;

// GL_ARB_map_buffer_range
PFNGLMAPBUFFERRANGEPROC			glMapBufferRange = NULL;
PFNGLFLUSHMAPPEDBUFFERRANGEPROC	glFlushMappedBufferRange = NULL;

// GL_ARB_sync
PFNGLFENCESYNCPROC				glFenceSync = NULL;
PFNGLISSYNCPROC					glIsSync = NULL;
PFNGLDELETESYNCPROC				glDeleteSync = NULL;
PFNGLCLIENTWAITSYNCPROC			glClientWaitSync = NULL;
PFNGLWAITSYNCPROC				glWaitSync = NULL;
PFNGLGETINTEGER64VPROC			glGetInteger64v = NULL;
PFNGLGETSYNCIVPROC				glGetSynciv = NULL;

// GL_APPLE_flush_buffer_range
PFNGLBUFFERPARAMETERIAPPLEPROC	glBufferParameteriAPPLE = NULL;
PFNGLFLUSHMAPPEDBUFFERRANGEAPPLEPROC glFlushMappedBufferRangeAPPLE = 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_timer_query
PFNGLQUERYCOUNTERPROC glQueryCounter = NULL;
PFNGLGETQUERYOBJECTI64VPROC glGetQueryObjecti64v = NULL;
PFNGLGETQUERYOBJECTUI64VPROC glGetQueryObjectui64v = NULL;

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

// GL_ARB_framebuffer_object
PFNGLISRENDERBUFFERPROC glIsRenderbuffer = NULL;
PFNGLBINDRENDERBUFFERPROC glBindRenderbuffer = NULL;
PFNGLDELETERENDERBUFFERSPROC glDeleteRenderbuffers = NULL;
PFNGLGENRENDERBUFFERSPROC glGenRenderbuffers = NULL;
PFNGLRENDERBUFFERSTORAGEPROC glRenderbufferStorage = NULL;
PFNGLGETRENDERBUFFERPARAMETERIVPROC glGetRenderbufferParameteriv = NULL;
PFNGLISFRAMEBUFFERPROC glIsFramebuffer = NULL;
PFNGLBINDFRAMEBUFFERPROC glBindFramebuffer = NULL;
PFNGLDELETEFRAMEBUFFERSPROC glDeleteFramebuffers = NULL;
PFNGLGENFRAMEBUFFERSPROC glGenFramebuffers = NULL;
PFNGLCHECKFRAMEBUFFERSTATUSPROC glCheckFramebufferStatus = NULL;
PFNGLFRAMEBUFFERTEXTURE1DPROC glFramebufferTexture1D = NULL;
PFNGLFRAMEBUFFERTEXTURE2DPROC glFramebufferTexture2D = NULL;
PFNGLFRAMEBUFFERTEXTURE3DPROC glFramebufferTexture3D = NULL;
PFNGLFRAMEBUFFERRENDERBUFFERPROC glFramebufferRenderbuffer = NULL;
PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVPROC glGetFramebufferAttachmentParameteriv = NULL;
PFNGLGENERATEMIPMAPPROC glGenerateMipmap = NULL;
PFNGLBLITFRAMEBUFFERPROC glBlitFramebuffer = NULL;
PFNGLRENDERBUFFERSTORAGEMULTISAMPLEPROC glRenderbufferStorageMultisample = NULL;
PFNGLFRAMEBUFFERTEXTURELAYERPROC glFramebufferTextureLayer = NULL;

//GL_ARB_texture_multisample
PFNGLTEXIMAGE2DMULTISAMPLEPROC glTexImage2DMultisample = NULL;
PFNGLTEXIMAGE3DMULTISAMPLEPROC glTexImage3DMultisample = NULL;
PFNGLGETMULTISAMPLEFVPROC glGetMultisamplefv = NULL;
PFNGLSAMPLEMASKIPROC glSampleMaski = NULL;

//transform feedback (4.0 core)
PFNGLBEGINTRANSFORMFEEDBACKPROC glBeginTransformFeedback = NULL;
PFNGLENDTRANSFORMFEEDBACKPROC glEndTransformFeedback = NULL;
PFNGLTRANSFORMFEEDBACKVARYINGSPROC glTransformFeedbackVaryings = NULL;
PFNGLBINDBUFFERRANGEPROC glBindBufferRange = NULL;
PFNGLBINDBUFFERBASEPROC glBindBufferBase = NULL;

//GL_ARB_debug_output
PFNGLDEBUGMESSAGECONTROLARBPROC glDebugMessageControlARB = NULL;
PFNGLDEBUGMESSAGEINSERTARBPROC glDebugMessageInsertARB = NULL;
PFNGLDEBUGMESSAGECALLBACKARBPROC glDebugMessageCallbackARB = NULL;
PFNGLGETDEBUGMESSAGELOGARBPROC glGetDebugMessageLogARB = NULL;

// GL_EXT_blend_func_separate
PFNGLBLENDFUNCSEPARATEEXTPROC glBlendFuncSeparateEXT = NULL;

// GL_ARB_draw_buffers
PFNGLDRAWBUFFERSARBPROC glDrawBuffersARB = 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;
PFNGLUNIFORMMATRIX3X4FVPROC glUniformMatrix3x4fv = 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;
PFNGLVERTEXATTRIBIPOINTERPROC glVertexAttribIPointer = NULL;

#if LL_WINDOWS
PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB = NULL;
#endif

// vertex shader prototypes
#if LL_LINUX || LL_SOLARIS
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 || LL_SOLARIS
PFNGLVERTEXATTRIB4NBVARBPROC glVertexAttrib4nbvARB = NULL;
PFNGLVERTEXATTRIB4NIVARBPROC glVertexAttrib4nivARB = NULL;
PFNGLVERTEXATTRIB4NSVARBPROC glVertexAttrib4nsvARB = NULL;
PFNGLVERTEXATTRIB4NUBARBPROC glVertexAttrib4nubARB = NULL;
PFNGLVERTEXATTRIB4NUBVARBPROC glVertexAttrib4nubvARB = NULL;
PFNGLVERTEXATTRIB4NUIVARBPROC glVertexAttrib4nuivARB = NULL;
PFNGLVERTEXATTRIB4NUSVARBPROC glVertexAttrib4nusvARB = NULL;
#if LL_LINUX  || LL_SOLARIS
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 || LL_SOLARIS
PFNGLBINDATTRIBLOCATIONARBPROC glBindAttribLocationARB = NULL;
PFNGLGETACTIVEATTRIBARBPROC glGetActiveAttribARB = NULL;
PFNGLGETATTRIBLOCATIONARBPROC glGetAttribLocationARB = NULL;

#if LL_WINDOWS
PFNWGLGETGPUIDSAMDPROC				wglGetGPUIDsAMD = NULL;
PFNWGLGETGPUINFOAMDPROC				wglGetGPUInfoAMD = NULL;
PFNWGLSWAPINTERVALEXTPROC			wglSwapIntervalEXT = NULL;
#endif

#if LL_LINUX_NV_GL_HEADERS
// linux nvidia headers.  these define these differently to mesa's.  ugh.
PFNGLACTIVETEXTUREARBPROC glActiveTextureARB = NULL;
PFNGLCLIENTACTIVETEXTUREARBPROC glClientActiveTextureARB = NULL;
PFNGLDRAWRANGEELEMENTSPROC glDrawRangeElements = NULL;
#endif // LL_LINUX_NV_GL_HEADERS
#endif

LLGLManager gGLManager;

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

	mHasMultitexture(FALSE),
	mHasATIMemInfo(FALSE),
	mHasAMDAssociations(FALSE),
	mHasNVXMemInfo(FALSE),
	mNumTextureUnits(1),
	mHasMipMapGeneration(FALSE),
	mHasCompressedTextures(FALSE),
	mHasFramebufferObject(FALSE),
	mMaxSamples(0),
	mHasBlendFuncSeparate(FALSE),
	mHasSync(FALSE),
	mHasVertexBufferObject(FALSE),
	mHasVertexArrayObject(FALSE),
	mHasMapBufferRange(FALSE),
	mHasFlushBufferRange(FALSE),
	mHasPBuffer(FALSE),
	mHasShaderObjects(FALSE),
	mHasVertexShader(FALSE),
	mHasFragmentShader(FALSE),
	mNumTextureImageUnits(0),
	mHasOcclusionQuery(FALSE),
	mHasTimerQuery(FALSE),
	mHasOcclusionQuery2(FALSE),
	mHasPointParameters(FALSE),
	mHasDrawBuffers(FALSE),
	mHasTextureRectangle(FALSE),
	mHasTextureMultisample(FALSE),
	mHasTransformFeedback(FALSE),
	mMaxSampleMaskWords(0),
	mMaxColorTextureSamples(0),
	mMaxDepthTextureSamples(0),
	mMaxIntegerSamples(0),

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

	mIsATI(FALSE),
	mIsNVIDIA(FALSE),
	mIsIntel(FALSE),
	mIsGF2or4MX(FALSE),
	mIsGF3(FALSE),
	mIsGFFX(FALSE),
	mATIOffsetVerticalLines(FALSE),
	mATIOldDriver(FALSE),
#if LL_DARWIN
	mIsMobileGF(FALSE),
#endif
	mHasRequirements(TRUE),

	mHasSeparateSpecularColor(FALSE),

	mDebugGPU(FALSE),

	mDriverVersionMajor(1),
	mDriverVersionMinor(0),
	mDriverVersionRelease(0),
	mGLVersion(1.0f),
	mGLSLVersionMajor(0),
	mGLSLVersionMinor(0),		
	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_ARB_create_context",gGLHExts.mSysExts))
	{
		GLH_EXT_NAME(wglCreateContextAttribsARB) = (PFNWGLCREATECONTEXTATTRIBSARBPROC)GLH_EXT_GET_PROC_ADDRESS("wglCreateContextAttribsARB");
	}
	else
	{
		LL_WARNS("RenderInit") << "No ARB create context extensions" << LL_ENDL;
	}

	// For retreiving information per AMD adapter, 
	// because we can't trust curently selected/default one when there are multiple
	mHasAMDAssociations = ExtensionExists("WGL_AMD_gpu_association", gGLHExts.mSysExts);
	if (mHasAMDAssociations)
	{
		GLH_EXT_NAME(wglGetGPUIDsAMD) = (PFNWGLGETGPUIDSAMDPROC)GLH_EXT_GET_PROC_ADDRESS("wglGetGPUIDsAMD");
		GLH_EXT_NAME(wglGetGPUInfoAMD) = (PFNWGLGETGPUINFOAMDPROC)GLH_EXT_GET_PROC_ADDRESS("wglGetGPUInfoAMD");
	}

	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;
	}

	stop_glerror();

#if LL_WINDOWS
	if (!glGetStringi)
	{
		glGetStringi = (PFNGLGETSTRINGIPROC) GLH_EXT_GET_PROC_ADDRESS("glGetStringi");
	}

	//reload extensions string (may have changed after using wglCreateContextAttrib)
	if (glGetStringi)
	{
		std::stringstream str;

		GLint count = 0;
		glGetIntegerv(GL_NUM_EXTENSIONS, &count);
		for (GLint i = 0; i < count; ++i)
		{
			std::string ext((const char*) glGetStringi(GL_EXTENSIONS, i));
			str << ext << " ";
			LL_DEBUGS("GLExtensions") << ext << LL_ENDL;
		}
		
		{
			PFNWGLGETEXTENSIONSSTRINGARBPROC wglGetExtensionsStringARB = 0;
			wglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)wglGetProcAddress("wglGetExtensionsStringARB");
			if(wglGetExtensionsStringARB)
			{
				str << (const char*) wglGetExtensionsStringARB(wglGetCurrentDC());
			}
		}

		free(gGLHExts.mSysExts);
		std::string extensions = str.str();
		gGLHExts.mSysExts = strdup(extensions.c_str());
	}
#endif
	
	stop_glerror();

	// 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,
		&mGLVersionString);

	mGLVersion = mDriverVersionMajor + mDriverVersionMinor * .1f;

	if (mGLVersion >= 2.f)
	{
		parse_glsl_version(mGLSLVersionMajor, mGLSLVersionMinor);

#if LL_DARWIN
		//never use GLSL greater than 1.20 on OSX
		if (mGLSLVersionMajor > 1 || mGLSLVersionMinor >= 30)
		{
			mGLSLVersionMajor = 1;
			mGLSLVersionMinor = 20;
		}
#endif
	}

	if (mGLVersion >= 2.1f && LLImageGL::sCompressTextures)
	{ //use texture compression
		glHint(GL_TEXTURE_COMPRESSION_HINT, GL_NICEST);
	}
	else
	{ //GL version is < 3.0, always disable texture compression
		LLImageGL::sCompressTextures = false;
	}
	
	// Trailing space necessary to keep "nVidia Corpor_ati_on" cards
	// from being recognized as ATI.
	if (mGLVendor.substr(0,4) == "ATI ")
	{
		mGLVendorShort = "ATI";
		// *TODO: Fix this?
		mIsATI = TRUE;

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

#if (LL_WINDOWS || LL_LINUX) && !LL_MESA_HEADLESS
		// count any pre OpenGL 3.0 implementation as an old driver
		if (mGLVersion < 3.f) 
		{
			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;
		}
#if LL_DARWIN
		else if ((mGLRenderer.find("9400M") != std::string::npos)
			  || (mGLRenderer.find("9600M") != std::string::npos)
			  || (mGLRenderer.find("9800M") != std::string::npos))
		{
			mIsMobileGF = TRUE;
		}
#endif

	}
	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";
	}
	
	stop_glerror();
	// This is called here because it depends on the setting of mIsGF2or4MX, and sets up mHasMultitexture.
	initExtensions();
	stop_glerror();

	if (mVRAM == 0)
	{
		S32 old_vram = mVRAM;
	mVRAM = 0;

#if LL_WINDOWS
	if (mHasAMDAssociations)
	{
		GLuint gl_gpus_count = wglGetGPUIDsAMD(0, 0);
		if (gl_gpus_count > 0)
		{
			GLuint* ids = new GLuint[gl_gpus_count];
			wglGetGPUIDsAMD(gl_gpus_count, ids);

			GLuint mem_mb = 0;
			for (U32 i = 0; i < gl_gpus_count; i++)
			{
				wglGetGPUInfoAMD(ids[i],
					WGL_GPU_RAM_AMD,
					GL_UNSIGNED_INT,
					sizeof(GLuint),
					&mem_mb);
				if (mVRAM < mem_mb)
				{
					// basically pick the best AMD and trust driver/OS to know to switch
					mVRAM = mem_mb;
				}
			}
		}
		if (mVRAM != 0)
		{
			LL_WARNS("RenderInit") << "VRAM Detected (AMDAssociations):" << mVRAM << LL_ENDL;
		}
	}
#endif

	if (mHasATIMemInfo && mVRAM == 0)
	{ //ask the gl how much vram is free at startup and attempt to use no more than half of that
		S32 meminfo[4];
		glGetIntegerv(GL_TEXTURE_FREE_MEMORY_ATI, meminfo);

		mVRAM = meminfo[0] / 1024;
		LL_WARNS("RenderInit") << "VRAM Detected (ATIMemInfo):" << mVRAM << LL_ENDL;
	}

	if (mHasNVXMemInfo && mVRAM == 0)
	{
		S32 dedicated_memory;
		glGetIntegerv(GL_GPU_MEMORY_INFO_DEDICATED_VIDMEM_NVX, &dedicated_memory);
		mVRAM = dedicated_memory/1024;
		LL_WARNS("RenderInit") << "VRAM Detected (NVXMemInfo):" << mVRAM << LL_ENDL;
	}

#if LL_WINDOWS
	if (mVRAM < 256)
	{
		// Something likely went wrong using the above extensions
		// try WMI first and fall back to old method (from dxdiag) if all else fails
		// Function will check all GPUs WMI knows of and will pick up the one with most
		// memory. We need to check all GPUs because system can switch active GPU to
		// weaker one, to preserve power when not under load.
		S32 mem = LLDXHardware::getMBVideoMemoryViaDXGI();
		if (mem != 0)
		{
			mVRAM = mem;
			LL_WARNS("RenderInit") << "VRAM Detected (WMI):" << mVRAM<< LL_ENDL;
		}
	}
#endif

	if (mVRAM < 256 && old_vram > 0)
	{
		// fall back to old method
		// Note: on Windows value will be from LLDXHardware.
		// Either received via dxdiag or via WMI by id from dxdiag.
		mVRAM = old_vram;
	}

		else
		{
			LL_INFOS("RenderInit") << "Detected VRAM from GL: " << mVRAM << LL_ENDL;
		}
	}
	else
	{
		LL_INFOS("RenderInit") << "Using VRAM value from OS: " << mVRAM << LL_ENDL;
	}

	stop_glerror();

	if (mHasFragmentShader)
	{
		GLint num_tex_image_units;
		glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS_ARB, &num_tex_image_units);
		mNumTextureImageUnits = llmin(num_tex_image_units, 32);
	}

	LL_INFOS() << "NUM TEX IMAGE UNITS: " << mNumTextureImageUnits << LL_ENDL;

	if (LLRender::sGLCoreProfile)
	{
		mNumTextureUnits = llmin(mNumTextureImageUnits, MAX_GL_TEXTURE_UNITS);
	}
	else 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;
	}
	
	stop_glerror();

	if (mHasTextureMultisample)
	{
		glGetIntegerv(GL_MAX_COLOR_TEXTURE_SAMPLES, &mMaxColorTextureSamples);
		glGetIntegerv(GL_MAX_DEPTH_TEXTURE_SAMPLES, &mMaxDepthTextureSamples);
		glGetIntegerv(GL_MAX_INTEGER_SAMPLES, &mMaxIntegerSamples);
		glGetIntegerv(GL_MAX_SAMPLE_MASK_WORDS, &mMaxSampleMaskWords);
	}

	stop_glerror();

#if LL_WINDOWS
	if (mHasDebugOutput && gDebugGL)
	{ //setup debug output callback
		//glDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_LOW_ARB, 0, NULL, GL_TRUE);
		glDebugMessageCallbackARB((GLDEBUGPROCARB) gl_debug_callback, NULL);
		glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB);
	}
#endif

	stop_glerror();

	//HACK always disable texture multisample, use FXAA instead
	mHasTextureMultisample = FALSE;
#if LL_WINDOWS
	if (mIsATI)
	{ //using multisample textures on ATI results in black screen for some reason
		mHasTextureMultisample = FALSE;
	}


	if (mIsIntel && mGLVersion <= 3.f)
	{ //never try to use framebuffer objects on older intel drivers (crashy)
		mHasFramebufferObject = FALSE;
	}
#endif

	if (mHasFramebufferObject)
	{
		glGetIntegerv(GL_MAX_SAMPLES, &mMaxSamples);
	}

	stop_glerror();
	
	setToDebugGPU();

	stop_glerror();

	initGLStates();

	stop_glerror();

	return true;
}

void LLGLManager::setToDebugGPU()
{
	//"MOBILE INTEL(R) 965 EXPRESS CHIP", 
	if (mGLRenderer.find("INTEL") != std::string::npos && mGLRenderer.find("965") != std::string::npos)
	{
		mDebugGPU = TRUE ;
	}

	return ;
}

void LLGLManager::getGLInfo(LLSD& info)
{
	if (gHeadlessClient)
	{
		info["GLInfo"]["GLVendor"] = HEADLESS_VENDOR_STRING;
		info["GLInfo"]["GLRenderer"] = HEADLESS_RENDERER_STRING;
		info["GLInfo"]["GLVersion"] = HEADLESS_VERSION_STRING;
		return;
	}
	else
	{
		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;

	if (gHeadlessClient)
	{
		info_str += std::string("GL_VENDOR      ") + HEADLESS_VENDOR_STRING + std::string("\n");
		info_str += std::string("GL_RENDERER    ") + HEADLESS_RENDERER_STRING + std::string("\n");
		info_str += std::string("GL_VERSION     ") + HEADLESS_VERSION_STRING + std::string("\n");
	}
	else
	{
		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 
	std::string all_exts= ll_safe_string(((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()
{
	if (gHeadlessClient)
	{
		LL_INFOS("RenderInit") << "GL_VENDOR:     " << HEADLESS_VENDOR_STRING << LL_ENDL;
		LL_INFOS("RenderInit") << "GL_RENDERER:   " << HEADLESS_RENDERER_STRING << LL_ENDL;
		LL_INFOS("RenderInit") << "GL_VERSION:    " << HEADLESS_VERSION_STRING << LL_ENDL;
	}
	else
	{
		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
	std::string all_exts= ll_safe_string(((const char *)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;
	if (gHeadlessClient)
	{
		gl_string = HEADLESS_VENDOR_STRING + " " + HEADLESS_RENDERER_STRING;
	}
	else
	{
		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.

void LLGLManager::initExtensions()
{
#if LL_MESA_HEADLESS
# ifdef GL_ARB_multitexture
	mHasMultitexture = TRUE;
# else
	mHasMultitexture = FALSE;
# endif // GL_ARB_multitexture