itgmania212121/stepmania/src/RageDisplay_OGL.cpp

#include "global.h"

#include "RageDisplay_OGL.h"
#include "RageDisplay_OGL_Helpers.h"
using namespace RageDisplay_OGL_Helpers;

#include "RageFile.h"
#include "RageSurface.h"
#include "RageSurfaceUtils.h"
#include "RageUtil.h"
#include "RageLog.h"
#include "RageTextureManager.h"
#include "RageMath.h"
#include "RageTypes.h"
#include "RageUtil.h"
#include "EnumHelper.h"
#include "Foreach.h"
#include "DisplayResolutions.h"
#include "LocalizedString.h"

#include "arch/LowLevelWindow/LowLevelWindow.h"

#include <set>

#if defined(_MSC_VER)
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "glu32.lib")
#endif

//
// Globals
//

static bool g_bReversePackedPixelsWorks = true;
static bool g_bColorIndexTableWorks = true;

/* OpenGL system information that generally doesn't change at runtime. */

/* Range and granularity of points and lines: */
static float g_line_range[2];
static float g_point_range[2];

/* OpenGL version * 10: */
static int g_glVersion;

/* GLU version * 10: */
static int g_gluVersion;

static int g_iMaxTextureUnits = 0;

/* We don't actually use normals (we don't turn on lighting), there's just
 * no GL_T2F_C4F_V3F. */
static const GLenum RageSpriteVertexFormat = GL_T2F_C4F_N3F_V3F;

/* If we support texture matrix scaling, a handle to the vertex program: */
static GLhandleARB g_bTextureMatrixShader = 0;

static map<unsigned, RenderTarget *> g_mapRenderTargets;
static RenderTarget *g_pCurrentRenderTarget = NULL;

static LowLevelWindow *g_pWind;

static bool g_bInvertY = false;

static void InvalidateObjects();

static RageDisplay::PixelFormatDesc PIXEL_FORMAT_DESC[NUM_PixelFormat] = {
	{
		/* R8G8B8A8 */
		32,
		{ 0xFF000000,
		  0x00FF0000,
		  0x0000FF00,
		  0x000000FF }
	}, {
		/* B8G8R8A8 */
		32,
		{ 0x0000FF00,
		  0x00FF0000,
		  0xFF000000,
		  0x000000FF }
	}, {
		/* R4G4B4A4 */
		16,
		{ 0xF000,
		  0x0F00,
		  0x00F0,
		  0x000F },
	}, {
		/* R5G5B5A1 */
		16,
		{ 0xF800,
		  0x07C0,
		  0x003E,
		  0x0001 },
	}, {
		/* R5G5B5X1 */
		16,
		{ 0xF800,
		  0x07C0,
		  0x003E,
		  0x0000 },
	}, {
		/* R8G8B8 */
		24,
		{ 0xFF0000,
		  0x00FF00,
		  0x0000FF,
		  0x000000 }
	}, {
		/* Paletted */
		8,
		{ 0,0,0,0 } /* N/A */
	}, {
		/* B8G8R8 */
		24,
		{ 0x0000FF,
		  0x00FF00,
		  0xFF0000,
		  0x000000 }
	}, {
		/* A1R5G5B5 */
		16,
		{ 0x7C00,
		  0x03E0,
		  0x001F,
		  0x8000 },
	}, {
		/* X1R5G5B5 */
		16,
		{ 0x7C00,
		  0x03E0,
		  0x001F,
		  0x0000 },
	}
};

/* g_GLPixFmtInfo is used for both texture formats and surface formats.  For example,
 * it's fine to ask for a PixelFormat_RGB5 texture, but to supply a surface matching
 * PixelFormat_RGB8.  OpenGL will simply discard the extra bits.
 *
 * It's possible for a format to be supported as a texture format but not as a
 * surface format.  For example, if packed pixels aren't supported, we can still
 * use GL_RGB5_A1, but we'll have to convert to a supported surface pixel format
 * first.  It's not ideal, since we'll convert to RGBA8 and OGL will convert back,
 * but it works fine.
 */
struct GLPixFmtInfo_t {
	GLenum internalfmt; /* target format */
	GLenum format; /* target format */
	GLenum type; /* data format */
} const g_GLPixFmtInfo[NUM_PixelFormat] = {
	{
		/* R8G8B8A8 */
		GL_RGBA8,
		GL_RGBA,
		GL_UNSIGNED_BYTE,
	}, {
		/* R8G8B8A8 */
		GL_RGBA8,
		GL_BGRA,
		GL_UNSIGNED_BYTE,
	}, {
		/* B4G4R4A4 */
		GL_RGBA4,
		GL_RGBA,
		GL_UNSIGNED_SHORT_4_4_4_4,
	}, {
		/* B5G5R5A1 */
		GL_RGB5_A1,
		GL_RGBA,
		GL_UNSIGNED_SHORT_5_5_5_1,
	}, {
		/* B5G5R5 */
		GL_RGB5,
		GL_RGBA,
		GL_UNSIGNED_SHORT_5_5_5_1,
	}, {
		/* B8G8R8 */
		GL_RGB8,
		GL_RGB,
		GL_UNSIGNED_BYTE,
	}, {
		/* Paletted */
		GL_COLOR_INDEX8_EXT,
		GL_COLOR_INDEX,
		GL_UNSIGNED_BYTE,
	}, {
		/* B8G8R8 */
		GL_RGB8,
		GL_BGR,
		GL_UNSIGNED_BYTE,
	}, {
		/* A1R5G5B5 (matches D3DFMT_A1R5G5B5) */
		GL_RGB5_A1,
		GL_BGRA,
		GL_UNSIGNED_SHORT_1_5_5_5_REV,
	}, {
		/* X1R5G5B5 */
		GL_RGB5,
		GL_BGRA,
		GL_UNSIGNED_SHORT_1_5_5_5_REV,
	}
};


static void FixLittleEndian()
{
#if defined(ENDIAN_LITTLE)
	static bool bInitialized = false;
	if( bInitialized )
		return;
	bInitialized = true;

	for( int i = 0; i < NUM_PixelFormat; ++i )
	{
		RageDisplay::PixelFormatDesc &pf = PIXEL_FORMAT_DESC[i];

		/* OpenGL and RageSurface handle byte formats differently; we need
		 * to flip non-paletted masks to make them line up. */
		if( g_GLPixFmtInfo[i].type != GL_UNSIGNED_BYTE || pf.bpp == 8 )
			continue;

		for( int mask = 0; mask < 4; ++mask)
		{
			int m = pf.masks[mask];
			switch( pf.bpp )
			{
			case 24: m = Swap24(m); break;
			case 32: m = Swap32(m); break;
			default: ASSERT(0);
			}
			pf.masks[mask] = m;
		}
	}
#endif
}


/* Making an OpenGL call doesn't also flush the error state; if we happen
 * to have an error from a previous call, then the assert below will fail. 
 * Flush it. */
#define FlushGLErrors() do { } while( glGetError() != GL_NO_ERROR )
#define AssertNoGLError() \
{ \
	GLenum error = glGetError(); \
	ASSERT_M( error == GL_NO_ERROR, GLToString(error) ); \
}

#if defined(DEBUG) || !defined(GL_GET_ERROR_IS_SLOW)
#define DebugFlushGLErrors() FlushGLErrors()
#define DebugAssertNoGLError() AssertNoGLError()
#else
#define DebugFlushGLErrors()
#define DebugAssertNoGLError()
#endif

static void TurnOffHardwareVBO()
{
	if( GLExt.glBindBufferARB )
	{
		GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
		GLExt.glBindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, 0 );
	}
}

RageDisplay_OGL::RageDisplay_OGL()
{
	LOG->Trace( "RageDisplay_OGL::RageDisplay_OGL()" );
	LOG->MapLog("renderer", "Current renderer: OpenGL");

	FixLittleEndian();
	RageDisplay_OGL_Helpers::Init();

	g_pWind = NULL;
	g_bTextureMatrixShader = 0;
}

RString GetInfoLog( GLhandleARB h )
{
	GLint iLength;
	GLExt.glGetObjectParameterivARB( h, GL_OBJECT_INFO_LOG_LENGTH_ARB, &iLength );
	if( !iLength )
		return RString();

	GLcharARB *pInfoLog = new GLcharARB[iLength];
	GLExt.glGetInfoLogARB( h, iLength, &iLength, pInfoLog );
	RString sRet = pInfoLog;
	delete [] pInfoLog;
	TrimRight( sRet );
	return sRet;
}

GLhandleARB CompileShader( GLenum ShaderType, RString sFile, vector<RString> asDefines )
{
	RString sBuffer;
	{
		RageFile file;
		if( !file.Open(sFile) )
		{
			LOG->Warn( "Error compiling shader %s: %s", sFile.c_str(), file.GetError().c_str() );
			return 0;
		}
		
		if( file.Read(sBuffer, file.GetFileSize()) == -1 )
		{
			LOG->Warn( "Error compiling shader %s: %s", sFile.c_str(), file.GetError().c_str() );
			return 0;
		}
	}

	LOG->Trace( "Compiling shader %s", sFile.c_str() );
	GLhandleARB hShader = GLExt.glCreateShaderObjectARB( ShaderType );
	vector<const GLcharARB *> apData;
	vector<GLint> aiLength;
	FOREACH( RString, asDefines, s )
	{
		*s = ssprintf( "#define %s\n", s->c_str() );
		apData.push_back( s->data() );
		aiLength.push_back( s->size() );
	}
	apData.push_back( "#line 1\n" );
	aiLength.push_back( 8 );

	apData.push_back( sBuffer.data() );
	aiLength.push_back( sBuffer.size() );
	GLExt.glShaderSourceARB( hShader, apData.size(), &apData[0], &aiLength[0] );

	GLExt.glCompileShaderARB( hShader );

	RString sInfo = GetInfoLog( hShader );

	GLint bCompileStatus  = GL_FALSE;
	GLExt.glGetObjectParameterivARB( hShader, GL_OBJECT_COMPILE_STATUS_ARB, &bCompileStatus );
	if( !bCompileStatus )
	{
		LOG->Warn( "Error compiling shader %s:\n%s", sFile.c_str(), sInfo.c_str() );
		GLExt.glDeleteObjectARB( hShader );
		return 0;
	}

	if( !sInfo.empty() )
		LOG->Trace( "Messages compiling shader %s:\n%s", sFile.c_str(), sInfo.c_str() );

	return hShader;
}

GLhandleARB LoadShader( GLenum ShaderType, RString sFile, vector<RString> asDefines )
{
	if( !GLExt.m_bGL_ARB_fragment_shader && ShaderType == GL_FRAGMENT_SHADER_ARB )
		return 0;
	if( !GLExt.m_bGL_ARB_vertex_shader && ShaderType == GL_VERTEX_SHADER_ARB )
		return 0;

	GLhandleARB hShader = CompileShader( ShaderType, sFile, asDefines );
	if( hShader == 0 )
		return 0;

	GLhandleARB hProgram = GLExt.glCreateProgramObjectARB();
	GLExt.glAttachObjectARB( hProgram, hShader );
	GLExt.glDeleteObjectARB( hShader );

	// Link the program.
	GLExt.glLinkProgramARB( hProgram );
	GLint bLinkStatus = false;
	GLExt.glGetObjectParameterivARB( hProgram, GL_OBJECT_LINK_STATUS_ARB, &bLinkStatus );

	if( !bLinkStatus )
	{
		LOG->Warn( "Error linking shader %s: %s", sFile.c_str(), GetInfoLog(hProgram).c_str() );
		GLExt.glDeleteObjectARB( hProgram );
		return 0;
	}
	return hProgram;
}

static int g_iAttribTextureMatrixScale;

static GLhandleARB g_bUnpremultiplyShader = 0;
static GLhandleARB g_bColorBurnShader = 0;
static GLhandleARB g_bColorDodgeShader = 0;
static GLhandleARB g_bVividLightShader = 0;
static GLhandleARB g_hHardMixShader = 0;
static GLhandleARB g_hYUYV422Shader = 0;

void InitShaders()
{
	vector<RString> asDefines;
	g_bTextureMatrixShader = LoadShader( GL_VERTEX_SHADER_ARB, "Data/Shaders/GLSL/Texture matrix scaling.vert", asDefines );
	g_bUnpremultiplyShader = LoadShader( GL_FRAGMENT_SHADER_ARB, "Data/Shaders/GLSL/Unpremultiply.frag", asDefines );
	g_bColorBurnShader = LoadShader( GL_FRAGMENT_SHADER_ARB, "Data/Shaders/GLSL/Color burn.frag", asDefines );
	g_bColorDodgeShader = LoadShader( GL_FRAGMENT_SHADER_ARB, "Data/Shaders/GLSL/Color dodge.frag", asDefines );
	g_bVividLightShader = LoadShader( GL_FRAGMENT_SHADER_ARB, "Data/Shaders/GLSL/Vivid light.frag", asDefines );
	g_hHardMixShader = LoadShader( GL_FRAGMENT_SHADER_ARB, "Data/Shaders/GLSL/Hard mix.frag", asDefines );
	g_hYUYV422Shader = LoadShader( GL_FRAGMENT_SHADER_ARB, "Data/Shaders/GLSL/YUYV422.frag", asDefines );

	// Bind attributes.
	if( g_bTextureMatrixShader )
	{
		FlushGLErrors();
		g_iAttribTextureMatrixScale = GLExt.glGetAttribLocationARB( g_bTextureMatrixShader, "TextureMatrixScale" );
		if( g_iAttribTextureMatrixScale == -1 )
		{
			LOG->Trace( "Scaling shader link failed: couldn't bind attribute \"TextureMatrixScale\"" );
			GLExt.glDeleteObjectARB( g_bTextureMatrixShader );
			g_bTextureMatrixShader = 0;
		}
		else
		{
			AssertNoGLError();

			/* Older Catalyst drivers seem to throw GL_INVALID_OPERATION here. */
			GLExt.glVertexAttrib2fARB( g_iAttribTextureMatrixScale, 1, 1 );
			GLenum iError = glGetError();
			if( iError == GL_INVALID_OPERATION )
			{
				LOG->Trace( "Scaling shader failed: glVertexAttrib2fARB returned GL_INVALID_OPERATION" );
				GLExt.glDeleteObjectARB( g_bTextureMatrixShader );
				g_bTextureMatrixShader = 0;
			}
			else
			{
				ASSERT_M( iError == GL_NO_ERROR, GLToString(iError) );
			}
		}
	}
}

static LocalizedString OBTAIN_AN_UPDATED_VIDEO_DRIVER ( "RageDisplay_OGL", "Obtain an updated driver from your video card manufacturer." );
static LocalizedString GLDIRECT_IS_NOT_COMPATIBLE ( "RageDisplay_OGL", "GLDirect was detected.  GLDirect is not compatible with this game and should be disabled." );
RString RageDisplay_OGL::Init( const VideoModeParams &p, bool bAllowUnacceleratedRenderer )
{
	g_pWind = LowLevelWindow::Create();

	bool bIgnore = false;
	RString sError = SetVideoMode( p, bIgnore );
	if( sError != "" )
		return sError;

	// Log driver details
	LOG->Info( "OGL Vendor: %s", glGetString(GL_VENDOR) );
	LOG->Info( "OGL Renderer: %s", glGetString(GL_RENDERER) );
	LOG->Info( "OGL Version: %s", glGetString(GL_VERSION) );
	LOG->Info( "OGL Max texture size: %i", GetMaxTextureSize() );
	LOG->Info( "OGL Texture units: %i", g_iMaxTextureUnits );
	LOG->Info( "GLU Version: %s", gluGetString(GLU_VERSION) );

	/* Pretty-print the extension string: */
	LOG->Info( "OGL Extensions:" );
	{
		const char *szExtensionString = (const char *) glGetString(GL_EXTENSIONS);
		vector<RString> asExtensions;
		split( szExtensionString, " ", asExtensions );
		sort( asExtensions.begin(), asExtensions.end() );
		size_t iNextToPrint = 0;
		while( iNextToPrint < asExtensions.size() )
		{
			size_t iLastToPrint = iNextToPrint;
			RString sType;
			for( size_t i = iNextToPrint; i<asExtensions.size(); ++i )
			{
				vector<RString> asBits;
				split( asExtensions[i], "_", asBits );
				RString sThisType;
				if( asBits.size() > 2 )
					sThisType = join( "_", asBits.begin(), asBits.begin()+2 );
				if( i > iNextToPrint && sThisType != sType )
					break;
				sType = sThisType;
				iLastToPrint = i;
			}

			if( iNextToPrint == iLastToPrint )
			{
				LOG->Info( "  %s", asExtensions[iNextToPrint].c_str() );
				++iNextToPrint;
				continue;
			}

			RString sList = ssprintf( "  %s: ", sType.c_str() );
			while( iNextToPrint <= iLastToPrint )
			{
				vector<RString> asBits;
				split( asExtensions[iNextToPrint], "_", asBits );
				RString sShortExt = join( "_", asBits.begin()+2, asBits.end() );
				sList += sShortExt;
				if( iNextToPrint < iLastToPrint )
					sList += ", ";
				if( iNextToPrint == iLastToPrint || sList.size() + asExtensions[iNextToPrint+1].size() > 120 )
				{
					LOG->Info( "%s", sList.c_str() );
					sList = "    ";
				}
				++iNextToPrint;
			}
		}
	}

	if( g_pWind->IsSoftwareRenderer(sError) )
	{
		if( !bAllowUnacceleratedRenderer )
			return sError + "  " + OBTAIN_AN_UPDATED_VIDEO_DRIVER.GetValue() + "\n\n";
		LOG->Warn( "Low-performance OpenGL renderer: " + sError );
	}

#if defined(_WINDOWS)
	/* GLDirect is a Direct3D wrapper for OpenGL.  It's rather buggy; and if in
	 * any case GLDirect can successfully render us, we should be able to do so
	 * too using Direct3D directly.  (If we can't, it's a bug that we can work
	 * around--if GLDirect can do it, so can we!) */
	if( !strncmp( (const char *) glGetString(GL_RENDERER), "GLDirect", 8 ) )
		return GLDIRECT_IS_NOT_COMPATIBLE.GetValue() + "\n";
#endif

	/* Log this, so if people complain that the radar looks bad on their
	 * system we can compare them: */
	glGetFloatv( GL_LINE_WIDTH_RANGE, g_line_range );
	glGetFloatv( GL_POINT_SIZE_RANGE, g_point_range );

	return RString();
}

RageDisplay_OGL::~RageDisplay_OGL()
{
	delete g_pWind;
}

void RageDisplay_OGL::GetDisplayResolutions( DisplayResolutions &out ) const
{
	out.clear();
	g_pWind->GetDisplayResolutions( out );
}

float RageDisplay_OGL::GetMonitorAspectRatio() const
{
	return g_pWind->GetMonitorAspectRatio();
}

static void CheckPalettedTextures()
{
	RString sError;
	do
	{
		if( !GLExt.HasExtension("GL_EXT_paletted_texture") )
		{
			sError = "GL_EXT_paletted_texture missing";
			break;
		}

		if( GLExt.glColorTableEXT == NULL )
		{
			sError = "glColorTableEXT missing";
			break;
		}

		if( GLExt.glGetColorTableParameterivEXT == NULL )
		{
			sError = "glGetColorTableParameterivEXT missing";
			break;
		}

		/* Check to see if paletted textures really work. */
		GLenum glTexFormat		= g_GLPixFmtInfo[PixelFormat_PAL].internalfmt;
		GLenum glImageFormat	= g_GLPixFmtInfo[PixelFormat_PAL].format;
		GLenum glImageType		= g_GLPixFmtInfo[PixelFormat_PAL].type;

		int iBits = 8;

		FlushGLErrors();
#define GL_CHECK_ERROR(f) \
{ \
	GLenum glError = glGetError(); \
	if( glError != GL_NO_ERROR ) { \
		sError = ssprintf(f " failed (%s)", GLToString(glError).c_str() ); \
		break; \
	} \
}

		glTexImage2D( GL_PROXY_TEXTURE_2D,
				0, glTexFormat, 
				16, 16, 0,
				glImageFormat, glImageType, NULL );
		GL_CHECK_ERROR( "glTexImage2D" );

		GLuint iFormat = 0;
		glGetTexLevelParameteriv( GL_PROXY_TEXTURE_2D, 0, GLenum(GL_TEXTURE_INTERNAL_FORMAT), (GLint *) &iFormat );
		GL_CHECK_ERROR( "glGetTexLevelParameteriv(GL_TEXTURE_INTERNAL_FORMAT)" );
		if( iFormat != glTexFormat )
		{
			sError = ssprintf( "Expected format %s, got %s instead",
					GLToString(glTexFormat).c_str(), GLToString(iFormat).c_str() );
			break;
		}

		GLubyte palette[256*4];
		memset(palette, 0, sizeof(palette));
		GLExt.glColorTableEXT(GL_PROXY_TEXTURE_2D, GL_RGBA8, 256, GL_RGBA, GL_UNSIGNED_BYTE, palette);
		GL_CHECK_ERROR( "glColorTableEXT" );

		GLint iSize = 0;
		glGetTexLevelParameteriv( GL_PROXY_TEXTURE_2D, 0, GLenum(GL_TEXTURE_INDEX_SIZE_EXT), &iSize );
		GL_CHECK_ERROR( "glGetTexLevelParameteriv(GL_TEXTURE_INDEX_SIZE_EXT)" );
		if( iBits > iSize || iSize > 8 )
		{
			sError = ssprintf( "Expected %i-bit palette, got a %i-bit one instead", iBits, int(iSize) );
			break;
		}

		GLint iRealWidth = 0;
		GLExt.glGetColorTableParameterivEXT( GL_PROXY_TEXTURE_2D, GL_COLOR_TABLE_WIDTH, &iRealWidth );
		GL_CHECK_ERROR( "glGetColorTableParameterivEXT(GL_COLOR_TABLE_WIDTH)" );
		if( iRealWidth != 1 << iBits )
		{
			sError = ssprintf( "GL_COLOR_TABLE_WIDTH returned %i instead of %i", int(iRealWidth), 1 << iBits );
			break;
		}

		GLint iRealFormat = 0;
		GLExt.glGetColorTableParameterivEXT( GL_PROXY_TEXTURE_2D, GL_COLOR_TABLE_FORMAT, &iRealFormat );
		GL_CHECK_ERROR( "glGetColorTableParameterivEXT(GL_COLOR_TABLE_FORMAT)" );
		if( iRealFormat != GL_RGBA8 )
		{
			sError = ssprintf( "GL_COLOR_TABLE_FORMAT returned %s instead of GL_RGBA8", GLToString(iRealFormat).c_str() );
			break;
		}
	} while(0);
#undef GL_CHECK_ERROR

	if( sError == "" )
		return;

	/* If 8-bit palettes don't work, disable them entirely--don't trust 4-bit
	 * palettes if it can't even get 8-bit ones right. */
	GLExt.glColorTableEXT = NULL;
	GLExt.glGetColorTableParameterivEXT = NULL;
	LOG->Info( "Paletted textures disabled: %s.", sError.c_str() );
}

static void CheckReversePackedPixels()
{
	/* Try to create a texture. */
	FlushGLErrors();
	glTexImage2D( GL_PROXY_TEXTURE_2D,
				0, GL_RGBA, 
				16, 16, 0,
				GL_BGRA, GL_UNSIGNED_SHORT_1_5_5_5_REV, NULL );

	const GLenum glError = glGetError();
	if( glError == GL_NO_ERROR )
	{
		g_bReversePackedPixelsWorks = true;
	}
	else
	{
		g_bReversePackedPixelsWorks = false;
		LOG->Info( "GL_UNSIGNED_SHORT_1_5_5_5_REV failed (%s), disabled",
			GLToString(glError).c_str() );
	}
}

void SetupExtensions()
{
	const float fGLVersion = StringToFloat( (const char *) glGetString(GL_VERSION) );
	g_glVersion = lrintf( fGLVersion * 10 );

	const float fGLUVersion = StringToFloat( (const char *) gluGetString(GLU_VERSION) );
	g_gluVersion = lrintf( fGLUVersion * 10 );

	GLExt.Load( g_pWind );

	g_iMaxTextureUnits = 1;
	if( GLExt.glActiveTextureARB != NULL )
		glGetIntegerv( GL_MAX_TEXTURE_UNITS_ARB, (GLint *) &g_iMaxTextureUnits );

	CheckPalettedTextures();
	CheckReversePackedPixels();

	{
		GLint iMaxTableSize = 0;
		glGetIntegerv( GL_MAX_PIXEL_MAP_TABLE, &iMaxTableSize );
		if( iMaxTableSize < 256 )
		{
			/* The minimum GL_MAX_PIXEL_MAP_TABLE is 32; if it's not at least 256,
			 * we can't fit a palette in it, so we can't send paletted data as input
			 * for a non-paletted texture. */
			LOG->Info( "GL_MAX_PIXEL_MAP_TABLE is only %d", int(iMaxTableSize) );
			g_bColorIndexTableWorks = false;
		}
		else
		{
			g_bColorIndexTableWorks = true;
		}
	}
}

void RageDisplay_OGL::ResolutionChanged()
{
	//LOG->Warn( "RageDisplay_OGL::ResolutionChanged" );

	/* Clear any junk that's in the framebuffer. */
	if( BeginFrame() )
		EndFrame();

	RageDisplay::ResolutionChanged();
}

// Return true if mode change was successful.
// bNewDeviceOut is set true if a new device was created and textures
// need to be reloaded.
RString RageDisplay_OGL::TryVideoMode( const VideoModeParams &p, bool &bNewDeviceOut )
{
	//LOG->Warn( "RageDisplay_OGL::TryVideoMode( %d, %d, %d, %d, %d, %d )", p.windowed, p.width, p.height, p.bpp, p.rate, p.vsync );

	RString err;
	err = g_pWind->TryVideoMode( p, bNewDeviceOut );
	if( err != "" )
		return err;	// failed to set video mode

	/* Now that we've initialized, we can search for extensions.  Do this before InvalidateObjects,
	 * since AllocateBuffers needs it. */
	SetupExtensions();

	if( bNewDeviceOut )
	{
		/* We have a new OpenGL context, so we have to tell our textures that
		 * their OpenGL texture number is invalid. */
		if( TEXTUREMAN )
			TEXTUREMAN->InvalidateTextures();

		/* Delete all render targets.  They may have associated resources other than
		 * the texture itself. */
		FOREACHM( unsigned, RenderTarget *, g_mapRenderTargets, rt )
			delete rt->second;
		g_mapRenderTargets.clear();

		/* Recreate all vertex buffers. */
		InvalidateObjects();

		InitShaders();
	}

	/* Set vsync the Windows way, if we can.  (What other extensions are there
	 * to do this, for other archs?) */
	if( GLExt.wglSwapIntervalEXT )
		GLExt.wglSwapIntervalEXT(p.vsync);
	
	ResolutionChanged();

	return RString();	// successfully set mode
}

int RageDisplay_OGL::GetMaxTextureSize() const
{
	GLint size;
	glGetIntegerv( GL_MAX_TEXTURE_SIZE, &size );
	return size;
}

bool RageDisplay_OGL::BeginFrame()
{
	/* We do this in here, rather than ResolutionChanged, or we won't update the
	 * viewport for the concurrent rendering context. */
	int fWidth = g_pWind->GetActualVideoModeParams().width;
	int fHeight = g_pWind->GetActualVideoModeParams().height;

	glViewport( 0, 0, fWidth, fHeight );

	glClearColor( 0,0,0,0 );
	SetZWrite( true );
	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

	return RageDisplay::BeginFrame();
}

void RageDisplay_OGL::EndFrame()
{
	glFlush();

	FrameLimitBeforeVsync( g_pWind->GetActualVideoModeParams().rate );
	g_pWind->SwapBuffers();
	FrameLimitAfterVsync();

	g_pWind->Update();

	RageDisplay::EndFrame();
}

RageSurface* RageDisplay_OGL::CreateScreenshot()
{
	int width = g_pWind->GetActualVideoModeParams().width;
	int height = g_pWind->GetActualVideoModeParams().height;

	const PixelFormatDesc &desc = PIXEL_FORMAT_DESC[PixelFormat_RGBA8];
	RageSurface *image = CreateSurface( width, height, desc.bpp,
		desc.masks[0], desc.masks[1], desc.masks[2], 0 );

	DebugFlushGLErrors();

	glReadBuffer( GL_FRONT );
	DebugAssertNoGLError();
	
	glReadPixels( 0, 0, g_pWind->GetActualVideoModeParams().width, g_pWind->GetActualVideoModeParams().height, GL_RGBA,
			GL_UNSIGNED_BYTE, image->pixels );
	DebugAssertNoGLError();

	RageSurfaceUtils::FlipVertically( image );

	return image;
}

RageSurface *RageDisplay_OGL::GetTexture( unsigned iTexture )
{
	if( iTexture == 0 )
		return NULL; // XXX

	FlushGLErrors();

	glBindTexture( GL_TEXTURE_2D, iTexture );
	GLint iHeight, iWidth, iAlphaBits;
	glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &iHeight );
	glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &iWidth );
	glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &iAlphaBits );
	int iFormat = iAlphaBits? PixelFormat_RGBA8:PixelFormat_RGB8;

	const PixelFormatDesc &desc = PIXEL_FORMAT_DESC[iFormat];
	RageSurface *pImage = CreateSurface( iWidth, iHeight, desc.bpp,
		desc.masks[0], desc.masks[1], desc.masks[2], desc.masks[3] );

	glGetTexImage( GL_TEXTURE_2D, 0, g_GLPixFmtInfo[iFormat].format, GL_UNSIGNED_BYTE, pImage->pixels );
	AssertNoGLError();

	return pImage;
}

VideoModeParams RageDisplay_OGL::GetActualVideoModeParams() const 
{
	return g_pWind->GetActualVideoModeParams();
}

static void SetupVertices( const RageSpriteVertex v[], int iNumVerts )
{
	static float *Vertex, *Texture, *Normal;	
	static GLubyte *Color;
	static int Size = 0;
	if( iNumVerts > Size )
	{
		Size = iNumVerts;
		delete [] Vertex;
		delete [] Color;
		delete [] Texture;
		delete [] Normal;
		Vertex = new float[Size*3];
		Color = new GLubyte[Size*4];
		Texture = new float[Size*2];
		Normal = new float[Size*3];
	}

	for( unsigned i = 0; i < unsigned(iNumVerts); ++i )
	{
		Vertex[i*3+0]  = v[i].p[0];
		Vertex[i*3+1]  = v[i].p[1];
		Vertex[i*3+2]  = v[i].p[2];
		Color[i*4+0]   = v[i].c.r;
		Color[i*4+1]   = v[i].c.g;
		Color[i*4+2]   = v[i].c.b;
		Color[i*4+3]   = v[i].c.a;
		Texture[i*2+0] = v[i].t[0];
		Texture[i*2+1] = v[i].t[1];
		Normal[i*3+0] = v[i].n[0];
		Normal[i*3+1] = v[i].n[1];
		Normal[i*3+2] = v[i].n[2];
	}
	glEnableClientState( GL_VERTEX_ARRAY );
	glVertexPointer( 3, GL_FLOAT, 0, Vertex );

	glEnableClientState( GL_COLOR_ARRAY );
	glColorPointer( 4, GL_UNSIGNED_BYTE, 0, Color );

	glEnableClientState( GL_TEXTURE_COORD_ARRAY );
	glTexCoordPointer( 2, GL_FLOAT, 0, Texture );

	if( GLExt.glClientActiveTextureARB != NULL )
	{
		GLExt.glClientActiveTextureARB( GL_TEXTURE1_ARB ); 
		glEnableClientState( GL_TEXTURE_COORD_ARRAY );
		glTexCoordPointer( 2, GL_FLOAT, 0, Texture );
		GLExt.glClientActiveTextureARB( GL_TEXTURE0_ARB ); 
	}

	glEnableClientState( GL_NORMAL_ARRAY );
	glNormalPointer( GL_FLOAT, 0, Normal );
}

void RageDisplay_OGL::SendCurrentMatrices()
{
	RageMatrix projection;
	RageMatrixMultiply( &projection, GetCentering(), GetProjectionTop() );

	if( g_bInvertY )
	{
		RageMatrix flip;
		RageMatrixScale( &flip, +1, -1, +1 );
		RageMatrixMultiply( &projection, &flip, &projection );
	}
	glMatrixMode( GL_PROJECTION );
	glLoadMatrixf( (const float*)&projection );

	// OpenGL has just "modelView", whereas D3D has "world" and "view"
	RageMatrix modelView;
	RageMatrixMultiply( &modelView, GetViewTop(), GetWorldTop() );
	glMatrixMode( GL_MODELVIEW );
	glLoadMatrixf( (const float*)&modelView );

	glMatrixMode( GL_TEXTURE );
	glLoadMatrixf( (const float*)GetTextureTop() );
}

class RageCompiledGeometrySWOGL : public RageCompiledGeometry
{
public:
	
	void Allocate( const vector<msMesh> &vMeshes )
	{
		/* Always allocate at least 1 entry, so &x[0] is valid. */
		m_vPosition.resize( max(1u, GetTotalVertices()) );
		m_vTexture.resize( max(1u, GetTotalVertices()) );
		m_vNormal.resize( max(1u, GetTotalVertices()) );
		m_vTexMatrixScale.resize( max(1u, GetTotalVertices()) );
		m_vTriangles.resize( max(1u, GetTotalTriangles()) );
	}
	void Change( const vector<msMesh> &vMeshes )
	{
		for( unsigned i=0; i<vMeshes.size(); i++ )
		{
			const MeshInfo& meshInfo = m_vMeshInfo[i];
			const msMesh& mesh = vMeshes[i];
			const vector<RageModelVertex> &Vertices = mesh.Vertices;
			const vector<msTriangle> &Triangles = mesh.Triangles;

			for( unsigned j=0; j<Vertices.size(); j++ )
			{
				m_vPosition[meshInfo.iVertexStart+j] = Vertices[j].p;
				m_vTexture[meshInfo.iVertexStart+j] = Vertices[j].t;
				m_vNormal[meshInfo.iVertexStart+j] = Vertices[j].n;
				m_vTexMatrixScale[meshInfo.iVertexStart+j] = Vertices[j].TextureMatrixScale;
			}

			for( unsigned j=0; j<Triangles.size(); j++ )
				for( unsigned k=0; k<3; k++ )
				{
					int iVertexIndexInVBO = meshInfo.iVertexStart + Triangles[j].nVertexIndices[k];
					m_vTriangles[meshInfo.iTriangleStart+j].nVertexIndices[k] = (uint16_t) iVertexIndexInVBO;
				}
		}
	}
	void Draw( int iMeshIndex ) const
	{
		TurnOffHardwareVBO();

		const MeshInfo& meshInfo = m_vMeshInfo[iMeshIndex];

		glEnableClientState(GL_VERTEX_ARRAY);
		glVertexPointer(3, GL_FLOAT, 0, &m_vPosition[0]);

		glDisableClientState(GL_COLOR_ARRAY);

		glEnableClientState(GL_TEXTURE_COORD_ARRAY);
		glTexCoordPointer(2, GL_FLOAT, 0, &m_vTexture[0]);

		glEnableClientState(GL_NORMAL_ARRAY);
		glNormalPointer(GL_FLOAT, 0, &m_vNormal[0]);

		if( meshInfo.m_bNeedsTextureMatrixScale )
		{
			// Kill the texture translation.
			// XXX: Change me to scale the translation by the TextureTranslationScale of the first vertex.
			RageMatrix mat;
			glGetFloatv( GL_TEXTURE_MATRIX , (float*)mat );

			/*
			for( int i=0; i<4; i++ )
			{
				RString s;
				for( int j=0; j<4; j++ )
					s += ssprintf( "%f ", mat.m[i][j] );
				LOG->Trace( s );
			}
			*/

			mat.m[3][0] = 0;
			mat.m[3][1] = 0;
			mat.m[3][2] = 0;

			glMatrixMode( GL_TEXTURE );
			glLoadMatrixf( (const float*)mat );
		}

		glDrawElements( 
			GL_TRIANGLES, 
			meshInfo.iTriangleCount*3, 
			GL_UNSIGNED_SHORT, 
			&m_vTriangles[0]+meshInfo.iTriangleStart );
	}

protected:
	vector<RageVector3> m_vPosition;
	vector<RageVector2> m_vTexture;
	vector<RageVector3> m_vNormal;
	vector<msTriangle>	m_vTriangles;
	vector<RageVector2>	m_vTexMatrixScale;
};

class InvalidateObject;
static set<InvalidateObject *> g_InvalidateList;
class InvalidateObject
{
public:
	InvalidateObject() { g_InvalidateList.insert( this ); }
	virtual ~InvalidateObject() { g_InvalidateList.erase( this ); }
	virtual void Invalidate() = 0;
};

static void InvalidateObjects()
{
	FOREACHS( InvalidateObject*, g_InvalidateList, it )
		(*it)->Invalidate();
}

class RageCompiledGeometryHWOGL : public RageCompiledGeometrySWOGL, public InvalidateObject
{
protected:
	// vertex buffer object names
	GLuint m_nPositions;
	GLuint m_nTextureCoords;
	GLuint m_nNormals;
	GLuint m_nTriangles;
	GLuint m_nTextureMatrixScale;

	void AllocateBuffers();
	void UploadData();

public:
	RageCompiledGeometryHWOGL();
	~RageCompiledGeometryHWOGL();

	/* This is called when our OpenGL context is invalidated. */
	void Invalidate();
	
	void Allocate( const vector<msMesh> &vMeshes );
	void Change( const vector<msMesh> &vMeshes );
	void Draw( int iMeshIndex ) const;
};

RageCompiledGeometryHWOGL::RageCompiledGeometryHWOGL()
{
	m_nPositions = 0;
	m_nTextureCoords = 0;
	m_nNormals = 0;
	m_nTriangles = 0;
	m_nTextureMatrixScale = 0;

	AllocateBuffers();
}

RageCompiledGeometryHWOGL::~RageCompiledGeometryHWOGL()
{
	DebugFlushGLErrors();

	GLExt.glDeleteBuffersARB( 1, &m_nPositions );
	DebugAssertNoGLError();
	GLExt.glDeleteBuffersARB( 1, &m_nTextureCoords );
	DebugAssertNoGLError();
	GLExt.glDeleteBuffersARB( 1, &m_nNormals );
	DebugAssertNoGLError();
	GLExt.glDeleteBuffersARB( 1, &m_nTriangles );
	DebugAssertNoGLError();
	GLExt.glDeleteBuffersARB( 1, &m_nTextureMatrixScale );
	DebugAssertNoGLError();
}

void RageCompiledGeometryHWOGL::AllocateBuffers()
{
	DebugFlushGLErrors();

	if( !m_nPositions )
	{
		GLExt.glGenBuffersARB( 1, &m_nPositions );
		DebugAssertNoGLError();
	}

	if( !m_nTextureCoords )
	{
		GLExt.glGenBuffersARB( 1, &m_nTextureCoords );
		DebugAssertNoGLError();
	}

	if( !m_nNormals )
	{
		GLExt.glGenBuffersARB( 1, &m_nNormals );
		DebugAssertNoGLError();
	}

	if( !m_nTriangles )
	{
		GLExt.glGenBuffersARB( 1, &m_nTriangles );
		DebugAssertNoGLError();
	}

	if( !m_nTextureMatrixScale )
	{
		GLExt.glGenBuffersARB( 1, &m_nTextureMatrixScale );
		DebugAssertNoGLError();
	}
}

void RageCompiledGeometryHWOGL::UploadData()
{
	DebugFlushGLErrors();

	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nPositions );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ARRAY_BUFFER_ARB, 
		GetTotalVertices()*sizeof(RageVector3), 
		&m_vPosition[0], 
		GL_STATIC_DRAW_ARB );
	DebugAssertNoGLError();

	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nTextureCoords );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ARRAY_BUFFER_ARB, 
		GetTotalVertices()*sizeof(RageVector2), 
		&m_vTexture[0], 
		GL_STATIC_DRAW_ARB );
	DebugAssertNoGLError();

	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nNormals );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ARRAY_BUFFER_ARB, 
		GetTotalVertices()*sizeof(RageVector3), 
		&m_vNormal[0], 
		GL_STATIC_DRAW_ARB );
	DebugAssertNoGLError();

	GLExt.glBindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, m_nTriangles );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ELEMENT_ARRAY_BUFFER_ARB, 
		GetTotalTriangles()*sizeof(msTriangle), 
		&m_vTriangles[0], 
		GL_STATIC_DRAW_ARB );
	DebugAssertNoGLError();


	if( m_bAnyNeedsTextureMatrixScale )
	{
		GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nTextureMatrixScale );
		DebugAssertNoGLError();
		GLExt.glBufferDataARB( 
			GL_ARRAY_BUFFER_ARB, 
			GetTotalVertices()*sizeof(RageVector2),
			&m_vTexMatrixScale[0],
			GL_STATIC_DRAW_ARB );
		DebugAssertNoGLError();
	}
}

void RageCompiledGeometryHWOGL::Invalidate()
{
	/* Our vertex buffers no longer exist.  Reallocate and reupload. */
	m_nPositions = 0;
	m_nTextureCoords = 0;
	m_nNormals = 0;
	m_nTriangles = 0;
	m_nTextureMatrixScale = 0;
	AllocateBuffers();
	UploadData();
}

void RageCompiledGeometryHWOGL::Allocate( const vector<msMesh> &vMeshes )
{
	DebugFlushGLErrors();

	RageCompiledGeometrySWOGL::Allocate( vMeshes );
	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nPositions );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ARRAY_BUFFER_ARB, 
		GetTotalVertices()*sizeof(RageVector3), 
		NULL, 
		GL_STATIC_DRAW_ARB );
	DebugAssertNoGLError();

	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nTextureCoords );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ARRAY_BUFFER_ARB, 
		GetTotalVertices()*sizeof(RageVector2), 
		NULL, 
		GL_STATIC_DRAW_ARB );
	DebugAssertNoGLError();

	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nNormals );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ARRAY_BUFFER_ARB, 
		GetTotalVertices()*sizeof(RageVector3), 
		NULL, 
		GL_STATIC_DRAW_ARB );
	DebugAssertNoGLError();

	GLExt.glBindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, m_nTriangles );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ELEMENT_ARRAY_BUFFER_ARB, 
		GetTotalTriangles()*sizeof(msTriangle), 
		NULL, 
		GL_STATIC_DRAW_ARB );
	DebugAssertNoGLError();

	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nTextureMatrixScale );
	DebugAssertNoGLError();
	GLExt.glBufferDataARB( 
		GL_ARRAY_BUFFER_ARB, 
		GetTotalVertices()*sizeof(RageVector2), 
		NULL,
		GL_STATIC_DRAW_ARB );
}

void RageCompiledGeometryHWOGL::Change( const vector<msMesh> &vMeshes )
{
	RageCompiledGeometrySWOGL::Change( vMeshes );

	UploadData();
}

void RageCompiledGeometryHWOGL::Draw( int iMeshIndex ) const
{
	DebugFlushGLErrors();

	const MeshInfo& meshInfo = m_vMeshInfo[iMeshIndex];
	if( !meshInfo.iVertexCount || !meshInfo.iTriangleCount )
		return;

	glEnableClientState(GL_VERTEX_ARRAY);
	DebugAssertNoGLError();
	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nPositions );
	DebugAssertNoGLError();
	glVertexPointer(3, GL_FLOAT, 0, NULL );
	DebugAssertNoGLError();

	glDisableClientState(GL_COLOR_ARRAY);
	DebugAssertNoGLError();

	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	DebugAssertNoGLError();
	GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nTextureCoords );
	DebugAssertNoGLError();
	glTexCoordPointer(2, GL_FLOAT, 0, NULL);
	DebugAssertNoGLError();

	// TRICKY:  Don't bind and send normals if lighting is disabled.  This 
	// will save some effort transforming these values.
	// XXX: We should keep track of these ourself and avoid glGet*()
	GLboolean bLighting;
	glGetBooleanv( GL_LIGHTING, &bLighting );
	GLboolean bTextureGenS;
	glGetBooleanv( GL_TEXTURE_GEN_S, &bTextureGenS );
	GLboolean bTextureGenT;
	glGetBooleanv( GL_TEXTURE_GEN_T, &bTextureGenT );
	if( bLighting || bTextureGenS || bTextureGenT )
	{
		glEnableClientState(GL_NORMAL_ARRAY);
		DebugAssertNoGLError();
		GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nNormals );
		DebugAssertNoGLError();
		glNormalPointer(GL_FLOAT, 0, NULL);
		DebugAssertNoGLError();
	}
	else
	{
		glDisableClientState(GL_NORMAL_ARRAY);
		DebugAssertNoGLError();
	}

	if( meshInfo.m_bNeedsTextureMatrixScale )
	{
		if( g_bTextureMatrixShader != 0 )
		{
			/* If we're using texture matrix scales, set up that buffer, too, and enable the
			 * vertex shader.  This shader doesn't support all OpenGL state, so only enable it
			 * if we're using it. */
			GLExt.glEnableVertexAttribArrayARB( g_iAttribTextureMatrixScale );
			DebugAssertNoGLError();
			GLExt.glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nTextureMatrixScale );
			DebugAssertNoGLError();
			GLExt.glVertexAttribPointerARB( g_iAttribTextureMatrixScale, 2, GL_FLOAT, false, 0, NULL );
			DebugAssertNoGLError();

			GLExt.glUseProgramObjectARB( g_bTextureMatrixShader );
			DebugAssertNoGLError();
		}
		else
		{
			// Kill the texture translation.
			// XXX: Change me to scale the translation by the TextureTranslationScale of the first vertex.
			RageMatrix mat;
			glGetFloatv( GL_TEXTURE_MATRIX , (float*)mat );

			/*
			for( int i=0; i<4; i++ )
			{
				RString s;
				for( int j=0; j<4; j++ )
					s += ssprintf( "%f ", mat.m[i][j] );
				LOG->Trace( s );
			}
			*/

			mat.m[3][0] = 0;
			mat.m[3][1] = 0;
			mat.m[3][2] = 0;

			glMatrixMode( GL_TEXTURE );
			glLoadMatrixf( (const float*)mat );
			DebugAssertNoGLError();
		}
	}

	GLExt.glBindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, m_nTriangles );
	DebugAssertNoGLError();

#define BUFFER_OFFSET(o) ((char*)(o))

	ASSERT( GLExt.glDrawRangeElements);
	GLExt.glDrawRangeElements( 
		GL_TRIANGLES, 
		meshInfo.iVertexStart,	// minimum array index contained in indices
		meshInfo.iVertexStart+meshInfo.iVertexCount-1,
					// maximum array index contained in indices
		meshInfo.iTriangleCount*3,	// number of elements to be rendered
		GL_UNSIGNED_SHORT,
		BUFFER_OFFSET(meshInfo.iTriangleStart*sizeof(msTriangle)) );
	DebugAssertNoGLError();

	if( meshInfo.m_bNeedsTextureMatrixScale && g_bTextureMatrixShader != 0 )
	{
		GLExt.glDisableVertexAttribArrayARB( g_iAttribTextureMatrixScale );
		GLExt.glUseProgramObjectARB( 0 );
	}
}

RageCompiledGeometry* RageDisplay_OGL::CreateCompiledGeometry()
{
	if( GLExt.glGenBuffersARB )
		return new RageCompiledGeometryHWOGL;
	else
		return new RageCompiledGeometrySWOGL;
}

void RageDisplay_OGL::DeleteCompiledGeometry( RageCompiledGeometry* p )
{
	delete p;
}

void RageDisplay_OGL::DrawQuadsInternal( const RageSpriteVertex v[], int iNumVerts )
{
	TurnOffHardwareVBO();
	SendCurrentMatrices();

	SetupVertices( v, iNumVerts );
	glDrawArrays( GL_QUADS, 0, iNumVerts );
}

void RageDisplay_OGL::DrawQuadStripInternal( const RageSpriteVertex v[], int iNumVerts )
{
	TurnOffHardwareVBO();
	SendCurrentMatrices();

	SetupVertices( v, iNumVerts );
	glDrawArrays( GL_QUAD_STRIP, 0, iNumVerts );
}

void RageDisplay_OGL::DrawSymmetricQuadStripInternal( const RageSpriteVertex v[], int iNumVerts )
{
	int iNumPieces = (iNumVerts-3)/3;
	int iNumTriangles = iNumPieces*4;
	int iNumIndices = iNumTriangles*3;

	// make a temporary index buffer
	static vector<uint16_t> vIndices;
	unsigned uOldSize = vIndices.size();
	unsigned uNewSize = max(uOldSize,(unsigned)iNumIndices);
	vIndices.resize( uNewSize );
	for( uint16_t i=(uint16_t)uOldSize/12; i<(uint16_t)iNumPieces; i++ )
	{
		// { 1, 3, 0 } { 1, 4, 3 } { 1, 5, 4 } { 1, 2, 5 }
		vIndices[i*12+0] = i*3+1;
		vIndices[i*12+1] = i*3+3;
		vIndices[i*12+2] = i*3+0;
		vIndices[i*12+3] = i*3+1;
		vIndices[i*12+4] = i*3+4;
		vIndices[i*12+5] = i*3+3;
		vIndices[i*12+6] = i*3+1;
		vIndices[i*12+7] = i*3+5;
		vIndices[i*12+8] = i*3+4;
		vIndices[i*12+9] = i*3+1;
		vIndices[i*12+10] = i*3+2;
		vIndices[i*12+11] = i*3+5;
	}

	TurnOffHardwareVBO();
	SendCurrentMatrices();

	SetupVertices( v, iNumVerts );
	glDrawElements( 
		GL_TRIANGLES, 
		iNumIndices,
		GL_UNSIGNED_SHORT, 
		&vIndices[0] );
}

void RageDisplay_OGL::DrawFanInternal( const RageSpriteVertex v[], int iNumVerts )
{
	TurnOffHardwareVBO();
	SendCurrentMatrices();

	SetupVertices( v, iNumVerts );
	glDrawArrays( GL_TRIANGLE_FAN, 0, iNumVerts );
}

void RageDisplay_OGL::DrawStripInternal( const RageSpriteVertex v[], int iNumVerts )
{
	TurnOffHardwareVBO();
	SendCurrentMatrices();

	SetupVertices( v, iNumVerts );
	glDrawArrays( GL_TRIANGLE_STRIP, 0, iNumVerts );
}

void RageDisplay_OGL::DrawTrianglesInternal( const RageSpriteVertex v[], int iNumVerts )
{
	TurnOffHardwareVBO();
	SendCurrentMatrices();

	SetupVertices( v, iNumVerts );
	glDrawArrays( GL_TRIANGLES, 0, iNumVerts );
}

void RageDisplay_OGL::DrawCompiledGeometryInternal( const RageCompiledGeometry *p, int iMeshIndex )
{
	TurnOffHardwareVBO();
	SendCurrentMatrices();

	p->Draw( iMeshIndex );
}

void RageDisplay_OGL::DrawLineStripInternal( const RageSpriteVertex v[], int iNumVerts, float fLineWidth )
{
	TurnOffHardwareVBO();

	if( !GetActualVideoModeParams().bSmoothLines )
	{
		/* Fall back on the generic polygon-based line strip. */
		RageDisplay::DrawLineStripInternal(v, iNumVerts, fLineWidth );
		return;
	}

	SendCurrentMatrices();

	/* Draw a nice AA'd line loop.  One problem with this is that point and line
	 * sizes don't always precisely match, which doesn't look quite right.
	 * It's worth it for the AA, though. */
	glEnable( GL_LINE_SMOOTH );

	/* fLineWidth is in units relative to object space, but OpenGL line and point sizes
	 * are in raster units (actual pixels).  Scale the line width by the average ratio;
	 * if object space is 640x480, and we have a 1280x960 window, we'll double the
	 * width. */
	{
		const RageMatrix* pMat = GetProjectionTop();
		float fW = 2 / pMat->m[0][0];
		float fH = -2 / pMat->m[1][1];
		float fWidthVal = float(g_pWind->GetActualVideoModeParams().width) / fW;
		float fHeightVal = float(g_pWind->GetActualVideoModeParams().height) / fH;
		fLineWidth *= (fWidthVal + fHeightVal) / 2;
	}

	/* Clamp the width to the hardware max for both lines and points (whichever
	 * is more restrictive). */
	fLineWidth = clamp( fLineWidth, g_line_range[0], g_line_range[1] );
	fLineWidth = clamp( fLineWidth, g_point_range[0], g_point_range[1] );

	/* Hmm.  The granularity of lines and points might be different; for example,
	 * if lines are .5 and points are .25, we might want to snap the width to the
	 * nearest .5, so the hardware doesn't snap them to different sizes.  Does it
	 * matter? */
	glLineWidth( fLineWidth );

	/* Draw the line loop: */
	SetupVertices( v, iNumVerts );
	glDrawArrays( GL_LINE_STRIP, 0, iNumVerts );

	glDisable( GL_LINE_SMOOTH );

	/* Round off the corners.  This isn't perfect; the point is sometimes a little
	 * larger than the line, causing a small bump on the edge.  Not sure how to fix
	 * that. */
	glPointSize( fLineWidth );

	/* Hack: if the points will all be the same, we don't want to draw
	 * any points at all, since there's nothing to connect.  That'll happen
	 * if both scale factors in the matrix are ~0.  (Actually, I think
	 * it's true if two of the three scale factors are ~0, but we don't
	 * use this for anything 3d at the moment anyway ...)  This is needed
	 * because points aren't scaled like regular polys--a zero-size point
	 * will still be drawn. */
	RageMatrix mat;
	glGetFloatv( GL_MODELVIEW_MATRIX, (float*)mat );

	if( mat.m[0][0] < 1e-5 && mat.m[1][1] < 1e-5 )
		return;

	glEnable( GL_POINT_SMOOTH );

	SetupVertices( v, iNumVerts );
	glDrawArrays( GL_POINTS, 0, iNumVerts );

	glDisable( GL_POINT_SMOOTH );
}

static bool SetTextureUnit( TextureUnit tu )
{
	// If multitexture isn't supported, ignore all textures except for 0.
	if( GLExt.glActiveTextureARB == NULL )
		return false;

	if( (int) tu > g_iMaxTextureUnits )
		return false;
	GLExt.glActiveTextureARB( enum_add2(GL_TEXTURE0_ARB, tu) );
	return true;
}

void RageDisplay_OGL::ClearAllTextures()
{
	FOREACH_ENUM( TextureUnit, i )
		SetTexture( i, 0 );

	// HACK:  Reset the active texture to 0.
	// TODO:  Change all texture functions to take a stage number.
	if( GLExt.glActiveTextureARB )
		GLExt.glActiveTextureARB(GL_TEXTURE0_ARB);
}

int RageDisplay_OGL::GetNumTextureUnits()
{
	if( GLExt.glActiveTextureARB == NULL )
		return 1;
	else
		return g_iMaxTextureUnits;
}

void RageDisplay_OGL::SetTexture( TextureUnit tu, unsigned iTexture )
{
	if( !SetTextureUnit( tu ) )
		return;

	if( iTexture )
	{
		glEnable( GL_TEXTURE_2D );
		glBindTexture( GL_TEXTURE_2D, iTexture );
	}
	else
	{
		glDisable( GL_TEXTURE_2D );
	}
}

void RageDisplay_OGL::SetTextureMode( TextureUnit tu, TextureMode tm )
{
	if( !SetTextureUnit( tu ) )
		return;

	switch( tm )
	{
	case TextureMode_Modulate:
		glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
		break;
	case TextureMode_Add:
		glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD );
		break;
	case TextureMode_Glow:
		if( !GLExt.m_bARB_texture_env_combine && !GLExt.m_bEXT_texture_env_combine )
		{
			/* This is changing blend state, instead of texture state, which isn't
			 * great, but it's better than doing nothing. */
			glBlendFunc( GL_SRC_ALPHA, GL_ONE );
			return;
		}

		/* Source color is the diffuse color only: */
		glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT );
		glTexEnvi( GL_TEXTURE_ENV, GLenum(GL_COMBINE_RGB_EXT), GL_REPLACE );
		glTexEnvi( GL_TEXTURE_ENV, GLenum(GL_SOURCE0_RGB_EXT), GL_PRIMARY_COLOR_EXT );

		/* Source alpha is texture alpha * diffuse alpha: */
		glTexEnvi( GL_TEXTURE_ENV, GLenum(GL_COMBINE_ALPHA_EXT), GL_MODULATE );
		glTexEnvi( GL_TEXTURE_ENV, GLenum(GL_OPERAND0_ALPHA_EXT), GL_SRC_ALPHA );
		glTexEnvi( GL_TEXTURE_ENV, GLenum(GL_SOURCE0_ALPHA_EXT), GL_PRIMARY_COLOR_EXT );
		glTexEnvi( GL_TEXTURE_ENV, GLenum(GL_OPERAND1_ALPHA_EXT), GL_SRC_ALPHA );
		glTexEnvi( GL_TEXTURE_ENV, GLenum(GL_SOURCE1_ALPHA_EXT), GL_TEXTURE );
		break;
	}
}

void RageDisplay_OGL::SetTextureFiltering( TextureUnit tu, bool b )
{
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, b? GL_LINEAR: GL_NEAREST );
	
	GLint iMinFilter;
	if( b )
	{
		GLint iWidth1 = -1;
		GLint iWidth2 = -1;
		glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &iWidth1 );
		glGetTexLevelParameteriv( GL_TEXTURE_2D, 1, GL_TEXTURE_WIDTH, &iWidth2 );
		if( iWidth1 > 1 && iWidth2 != 0 )
		{
			/* Mipmaps are enabled. */
			if( g_pWind->GetActualVideoModeParams().bTrilinearFiltering )
				iMinFilter = GL_LINEAR_MIPMAP_LINEAR;
			else
				iMinFilter = GL_LINEAR_MIPMAP_NEAREST;
		}
		else
		{
			iMinFilter = GL_LINEAR;
		}
	}
	else
	{
		iMinFilter = GL_NEAREST;
	}

	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, iMinFilter );
}

void RageDisplay_OGL::SetEffectMode( EffectMode effect )
{
	if( GLExt.glUseProgramObjectARB == NULL )
		return;

	GLhandleARB hShader = 0;
	switch( effect )
	{
	case EffectMode_Normal:		hShader = 0; break;
	case EffectMode_Unpremultiply:	hShader = g_bUnpremultiplyShader; break;
	case EffectMode_ColorBurn:	hShader = g_bColorBurnShader; break;
	case EffectMode_ColorDodge:	hShader = g_bColorDodgeShader; break;
	case EffectMode_VividLight:	hShader = g_bVividLightShader; break;
	case EffectMode_HardMix:	hShader = g_hHardMixShader; break;
	case EffectMode_YUYV422:	hShader = g_hYUYV422Shader; break;
	}

	DebugFlushGLErrors();
	GLExt.glUseProgramObjectARB( hShader );
	if( hShader == 0 )
		return;
	GLint iTexture1 = GLExt.glGetUniformLocationARB( hShader, "Texture1" );
	GLint iTexture2 = GLExt.glGetUniformLocationARB( hShader, "Texture2" );
	GLExt.glUniform1iARB( iTexture1, 0 );
	GLExt.glUniform1iARB( iTexture2, 1 );

	if( effect == EffectMode_YUYV422 )
	{
		GLint iTextureWidthUniform = GLExt.glGetUniformLocationARB( hShader, "TextureWidth" );
		GLint iWidth;
		glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &iWidth );
		GLExt.glUniform1iARB( iTextureWidthUniform, iWidth );
	}

	DebugAssertNoGLError();
}

bool RageDisplay_OGL::IsEffectModeSupported( EffectMode effect )
{
	switch( effect )
	{
	case EffectMode_Normal:		return true;
	case EffectMode_Unpremultiply:	return g_bUnpremultiplyShader != 0;
	case EffectMode_ColorBurn:	return g_bColorBurnShader != 0;
	case EffectMode_ColorDodge:	return g_bColorDodgeShader != 0;
	case EffectMode_VividLight:	return g_bVividLightShader != 0;
	case EffectMode_HardMix:	return g_hHardMixShader != 0;
	case EffectMode_YUYV422:	return g_hYUYV422Shader != 0;
	}

	return false;
}

void RageDisplay_OGL::SetBlendMode( BlendMode mode )
{
	glEnable(GL_BLEND);

	if( GLExt.glBlendEquation != NULL )
	{
		if( mode == BLEND_INVERT_DEST )
			GLExt.glBlendEquation( GL_FUNC_SUBTRACT );
		else
			GLExt.glBlendEquation( GL_FUNC_ADD );
	}

	int iSourceRGB, iDestRGB;
	int iSourceAlpha = GL_ONE, iDestAlpha = GL_ONE_MINUS_SRC_ALPHA;
	switch( mode )
	{
	case BLEND_NORMAL:
		iSourceRGB = GL_SRC_ALPHA; iDestRGB = GL_ONE_MINUS_SRC_ALPHA;
		break;
	case BLEND_ADD:
		iSourceRGB = GL_SRC_ALPHA; iDestRGB = GL_ONE;
		break;
	case BLEND_COPY_SRC:
		iSourceRGB = GL_ONE; iDestRGB = GL_ZERO;
		iSourceAlpha = GL_ONE; iDestAlpha = GL_ZERO;
		break;
	case BLEND_ALPHA_MASK:
		iSourceRGB = GL_ZERO; iDestRGB = GL_ONE;
		iSourceAlpha = GL_ZERO; iDestAlpha = GL_SRC_ALPHA;
		break;
	case BLEND_ALPHA_KNOCK_OUT:
		iSourceRGB = GL_ZERO; iDestRGB = GL_ONE;
		iSourceAlpha = GL_ZERO; iDestAlpha = GL_ONE_MINUS_SRC_ALPHA;
		break;
	case BLEND_WEIGHTED_MULTIPLY:
		/* output = 2*(dst*src).  0.5,0.5,0.5 is identity; darker colors darken the image,
		 * and brighter colors lighten the image. */
		iSourceRGB = GL_DST_COLOR; iDestRGB = GL_SRC_COLOR;
		break;
	case BLEND_INVERT_DEST:
		/* out = src - dst.  The source color should almost always be #FFFFFF, to make it "1 - dst". */
		iSourceRGB = GL_ONE; iDestRGB = GL_ONE;
		break;
	case BLEND_NO_EFFECT:
		iSourceRGB = GL_ZERO; iDestRGB = GL_ONE;
		iSourceAlpha = GL_ZERO; iSourceAlpha = GL_ONE;
		break;
	DEFAULT_FAIL( mode );
	}

	if( GLExt.glBlendFuncSeparateEXT != NULL )
		GLExt.glBlendFuncSeparateEXT( iSourceRGB, iDestRGB, iSourceAlpha, iDestAlpha );
	else
		glBlendFunc( iSourceRGB, iDestRGB );
}

bool RageDisplay_OGL::IsZWriteEnabled() const
{
	bool a;
	glGetBooleanv( GL_DEPTH_WRITEMASK, (unsigned char*)&a );
	return a;
}

bool RageDisplay_OGL::IsZTestEnabled() const
{
	GLenum a;
	glGetIntegerv( GL_DEPTH_FUNC, (GLint*)&a );
	return a != GL_ALWAYS;
}

void RageDisplay_OGL::ClearZBuffer()
{
	bool write = IsZWriteEnabled();
	SetZWrite( true );
	glClear( GL_DEPTH_BUFFER_BIT );
	SetZWrite( write );
}

void RageDisplay_OGL::SetZWrite( bool b )
{
	glDepthMask( b );
}

void RageDisplay_OGL::SetZBias( float f )
{
	float fNear = SCALE( f, 0.0f, 1.0f, 0.05f, 0.0f );
	float fFar = SCALE( f, 0.0f, 1.0f, 1.0f, 0.95f );

	glDepthRange( fNear, fFar );
}

void RageDisplay_OGL::SetZTestMode( ZTestMode mode )
{
	glEnable( GL_DEPTH_TEST );
	switch( mode )
	{
	case ZTEST_OFF:			glDepthFunc( GL_ALWAYS );	break;
	case ZTEST_WRITE_ON_PASS:	glDepthFunc( GL_LEQUAL );	break;
	case ZTEST_WRITE_ON_FAIL:	glDepthFunc( GL_GREATER );	break;
	default:	ASSERT( 0 );
	}
}

void RageDisplay_OGL::SetTextureWrapping( TextureUnit tu, bool b )
{
	/* This should be per-texture-unit state, but it's per-texture state in OpenGl,
	 * so we'll behave incorrectly if the same texture is used in more than one texture
	 * unit simultaneously with different wrapping. */
	SetTextureUnit( tu );
	
	GLenum mode = b ? GL_REPEAT : GL_CLAMP_TO_EDGE;
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, mode );
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, mode );
}

void RageDisplay_OGL::SetMaterial( 
	const RageColor &emissive,
	const RageColor &ambient,
	const RageColor &diffuse,
	const RageColor &specular,
	float shininess
	)
{
	// TRICKY:  If lighting is off, then setting the material 
	// will have no effect.  Even if lighting is off, we still
	// want Models to have basic color and transparency.
	// We can do this fake lighting by setting the vertex color.
	// XXX: unintended: SetLighting must be called before SetMaterial
	GLboolean bLighting;
	glGetBooleanv( GL_LIGHTING, &bLighting );

	if( bLighting )
	{
		glMaterialfv( GL_FRONT, GL_EMISSION, emissive );
		glMaterialfv( GL_FRONT, GL_AMBIENT, ambient );
		glMaterialfv( GL_FRONT, GL_DIFFUSE, diffuse );
		glMaterialfv( GL_FRONT, GL_SPECULAR, specular );
		glMaterialf( GL_FRONT, GL_SHININESS, shininess );
	}
	else
	{
		RageColor c = diffuse;
		c.r += emissive.r + ambient.r;
		c.g += emissive.g + ambient.g;
		c.b += emissive.b + ambient.b;
		glColor4fv( c );
	}
}

void RageDisplay_OGL::SetLighting( bool b )
{
	if( b )	glEnable( GL_LIGHTING );
	else	glDisable( GL_LIGHTING );
}

void RageDisplay_OGL::SetLightOff( int index )
{
	glDisable( GL_LIGHT0+index );
}

void RageDisplay_OGL::SetLightDirectional( 
	int index, 
	const RageColor &ambient, 
	const RageColor &diffuse, 
	const RageColor &specular, 
	const RageVector3 &dir )
{
	// Light coordinates are transformed by the modelview matrix, but
	// we are being passed in world-space coords.
	glPushMatrix();
	glLoadIdentity();

	glEnable( GL_LIGHT0+index );
	glLightfv( GL_LIGHT0+index, GL_AMBIENT, ambient );
	glLightfv( GL_LIGHT0+index, GL_DIFFUSE, diffuse );
	glLightfv( GL_LIGHT0+index, GL_SPECULAR, specular );
	float position[4] = {dir.x, dir.y, dir.z, 0};
	glLightfv( GL_LIGHT0+index, GL_POSITION, position );

	glPopMatrix();
}

void RageDisplay_OGL::SetCullMode( CullMode mode )
{
	switch( mode )
	{
	case CULL_BACK:
		glEnable( GL_CULL_FACE );
		glCullFace( GL_BACK );
		break;
	case CULL_FRONT:
		glEnable( GL_CULL_FACE );
		glCullFace( GL_FRONT );
		break;
	case CULL_NONE:
		glDisable( GL_CULL_FACE );
		break;
	default:
		ASSERT(0);
	}
}

const RageDisplay::PixelFormatDesc *RageDisplay_OGL::GetPixelFormatDesc(PixelFormat pf) const
{
	ASSERT( pf < NUM_PixelFormat );
	return &PIXEL_FORMAT_DESC[pf];
}

bool RageDisplay_OGL::SupportsThreadedRendering()
{
	return g_pWind->SupportsThreadedRendering();
}

void RageDisplay_OGL::BeginConcurrentRenderingMainThread()
{
	g_pWind->BeginConcurrentRenderingMainThread();
}

void RageDisplay_OGL::EndConcurrentRenderingMainThread()
{
	g_pWind->EndConcurrentRenderingMainThread();
}

void RageDisplay_OGL::BeginConcurrentRendering()
{
	g_pWind->BeginConcurrentRendering();
	RageDisplay::BeginConcurrentRendering();
}

void RageDisplay_OGL::EndConcurrentRendering()
{
	g_pWind->EndConcurrentRendering();
}

void RageDisplay_OGL::DeleteTexture( unsigned iTexture )
{
	if( iTexture == 0 )
		return;

	if( g_mapRenderTargets.find(iTexture) != g_mapRenderTargets.end() )
	{
		delete g_mapRenderTargets[iTexture];
		g_mapRenderTargets.erase( iTexture );
		return;
	}

	DebugFlushGLErrors();
	glDeleteTextures( 1, reinterpret_cast<GLuint*>(&iTexture) );
	DebugAssertNoGLError();
}


PixelFormat RageDisplay_OGL::GetImgPixelFormat( RageSurface* &img, bool &bFreeImg, int width, int height, bool bPalettedTexture )
{
	PixelFormat pixfmt = FindPixelFormat( img->format->BitsPerPixel, img->format->Rmask, img->format->Gmask, img->format->Bmask, img->format->Amask );
	
	/* If img is paletted, we're setting up a non-paletted texture, and color indexes
	 * are too small, depalettize. */
	bool bSupported = true;
	if( !bPalettedTexture && img->fmt.BytesPerPixel == 1 && !g_bColorIndexTableWorks )
		bSupported = false;

	if( pixfmt == PixelFormat_Invalid || !SupportsSurfaceFormat(pixfmt) )
		bSupported = false;

	if( !bSupported )
	{
		/* The source isn't in a supported, known pixel format.  We need to convert
		 * it ourself.  Just convert it to RGBA8, and let OpenGL convert it back
		 * down to whatever the actual pixel format is.  This is a very slow code
		 * path, which should almost never be used. */
		pixfmt = PixelFormat_RGBA8;
		ASSERT( SupportsSurfaceFormat(pixfmt) );

		const PixelFormatDesc *pfd = DISPLAY->GetPixelFormatDesc(pixfmt);

		RageSurface *imgconv = CreateSurface( img->w, img->h,
			pfd->bpp, pfd->masks[0], pfd->masks[1], pfd->masks[2], pfd->masks[3] );
		RageSurfaceUtils::Blit( img, imgconv, width, height );
		img = imgconv;
		bFreeImg = true;
	}
	else
	{
		bFreeImg = false;
	}

	return pixfmt;
}

/* If we're sending a paletted surface to a non-paletted texture, set the palette. */
void SetPixelMapForSurface( int glImageFormat, int glTexFormat, const RageSurfacePalette *palette )
{
	if( glImageFormat != GL_COLOR_INDEX || glTexFormat == GL_COLOR_INDEX8_EXT )
	{
		glPixelTransferi( GL_MAP_COLOR, false );
		return;
	}

	GLushort buf[4][256];
	memset( buf, 0, sizeof(buf) );

	for( int i = 0; i < palette->ncolors; ++i )
	{
		buf[0][i] = SCALE( palette->colors[i].r, 0, 255, 0, 65535 );
		buf[1][i] = SCALE( palette->colors[i].g, 0, 255, 0, 65535 );
		buf[2][i] = SCALE( palette->colors[i].b, 0, 255, 0, 65535 );
		buf[3][i] = SCALE( palette->colors[i].a, 0, 255, 0, 65535 );
	}

	DebugFlushGLErrors();
	glPixelMapusv( GL_PIXEL_MAP_I_TO_R, 256, buf[0] );
	glPixelMapusv( GL_PIXEL_MAP_I_TO_G, 256, buf[1] );
	glPixelMapusv( GL_PIXEL_MAP_I_TO_B, 256, buf[2] );
	glPixelMapusv( GL_PIXEL_MAP_I_TO_A, 256, buf[3] );
	glPixelTransferi( GL_MAP_COLOR, true );
	DebugAssertNoGLError();
}

unsigned RageDisplay_OGL::CreateTexture( 
	PixelFormat pixfmt,
	RageSurface* pImg,
	bool bGenerateMipMaps )
{
	ASSERT( pixfmt < NUM_PixelFormat );


	/* Find the pixel format of the surface we've been given. */
	bool bFreeImg;
	PixelFormat SurfacePixFmt = GetImgPixelFormat( pImg, bFreeImg, pImg->w, pImg->h, pixfmt == PixelFormat_PAL );
	ASSERT( SurfacePixFmt != PixelFormat_Invalid );

	GLenum glTexFormat = g_GLPixFmtInfo[pixfmt].internalfmt;
	GLenum glImageFormat = g_GLPixFmtInfo[SurfacePixFmt].format;
	GLenum glImageType = g_GLPixFmtInfo[SurfacePixFmt].type;

	/* If the image is paletted, but we're not sending it to a paletted image,
	 * set up glPixelMap. */
	SetPixelMapForSurface( glImageFormat, glTexFormat, pImg->format->palette );

	// HACK:  OpenGL 1.2 types aren't available in GLU 1.3.  Don't call GLU for mip
	// mapping if we're using an OGL 1.2 type and don't have >= GLU 1.3.
	// http://pyopengl.sourceforge.net/documentation/manual/gluBuild2DMipmaps.3G.html
	if( bGenerateMipMaps && g_gluVersion < 13 )
	{
		switch( pixfmt )
		{
		// OpenGL 1.1 types
		case PixelFormat_RGBA8:
		case PixelFormat_RGB8:
		case PixelFormat_PAL:
		case PixelFormat_BGR8:
			break;
		// OpenGL 1.2 types
		default:
			LOG->Trace( "Can't generate mipmaps for type %s because GLU version %.1f is too old.", GLToString(glImageType).c_str(), g_gluVersion/10.f );
			bGenerateMipMaps = false;
			break;
		}
	}

	SetTextureUnit( TextureUnit_1 );

	// allocate OpenGL texture resource
	unsigned int iTexHandle;
	glGenTextures( 1, reinterpret_cast<GLuint*>(&iTexHandle) );
	ASSERT( iTexHandle );
	
	glBindTexture( GL_TEXTURE_2D, iTexHandle );

	if( g_pWind->GetActualVideoModeParams().bAnisotropicFiltering &&
		GLExt.HasExtension("GL_EXT_texture_filter_anisotropic") )
	{
		GLfloat fLargestSupportedAnisotropy;
		glGetFloatv( GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &fLargestSupportedAnisotropy );
		glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, fLargestSupportedAnisotropy );
	}

	SetTextureFiltering( TextureUnit_1, true );
	SetTextureWrapping( TextureUnit_1, false );

	glPixelStorei( GL_UNPACK_ROW_LENGTH, pImg->pitch / pImg->format->BytesPerPixel );


	if( pixfmt == PixelFormat_PAL )
	{
		/* The texture is paletted; set the texture palette. */
		GLubyte palette[256*4];
		memset( palette, 0, sizeof(palette) );
		int p = 0;
		/* Copy the palette to the format OpenGL expects. */
		for( int i = 0; i < pImg->format->palette->ncolors; ++i )
		{
			palette[p++] = pImg->format->palette->colors[i].r;
			palette[p++] = pImg->format->palette->colors[i].g;
			palette[p++] = pImg->format->palette->colors[i].b;
			palette[p++] = pImg->format->palette->colors[i].a;
		}

		/* Set the palette. */
		GLExt.glColorTableEXT( GL_TEXTURE_2D, GL_RGBA8, 256, GL_RGBA, GL_UNSIGNED_BYTE, palette );

		GLint iRealFormat = 0;
		GLExt.glGetColorTableParameterivEXT( GL_TEXTURE_2D, GL_COLOR_TABLE_FORMAT, &iRealFormat );
		ASSERT( iRealFormat == GL_RGBA8 );
	}

	LOG->Trace( "%s (format %s, %ix%i, format %s, type %s, pixfmt %i, imgpixfmt %i)",
		bGenerateMipMaps? "gluBuild2DMipmaps":"glTexImage2D",
		GLToString(glTexFormat).c_str(),
		pImg->w, pImg->h,
		GLToString(glImageFormat).c_str(),
		GLToString(glImageType).c_str(), pixfmt, SurfacePixFmt );

	DebugFlushGLErrors();

	if( bGenerateMipMaps )
	{
		GLenum error = gluBuild2DMipmaps(
			GL_TEXTURE_2D, glTexFormat, 
			pImg->w, pImg->h,
			glImageFormat, glImageType, pImg->pixels );
		ASSERT_M( error == 0, (char *) gluErrorString(error) );
	}
	else
	{
		glTexImage2D(
			GL_TEXTURE_2D, 0, glTexFormat, 
			power_of_two(pImg->w), power_of_two(pImg->h), 0,
			glImageFormat, glImageType, NULL );
		if( pImg->pixels )
			glTexSubImage2D( GL_TEXTURE_2D, 0,
				0, 0,
				pImg->w, pImg->h,
				glImageFormat, glImageType, pImg->pixels );
		
		DebugAssertNoGLError();
	}


	/* Sanity check: */
	if( pixfmt == PixelFormat_PAL )
	{
		GLint iSize = 0;
		glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GLenum(GL_TEXTURE_INDEX_SIZE_EXT), &iSize );
		if( iSize != 8 )
			RageException::Throw( "Thought paletted textures worked, but they don't." );
	}

	glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
	glFlush();

	if( bFreeImg )
		delete pImg;
	return iTexHandle;
}

struct RageTextureLock_OGL: public RageTextureLock, public InvalidateObject
{
public:
	RageTextureLock_OGL()
	{
		m_iTexHandle = 0;
		m_iBuffer = 0;

		CreateObject();
	}

	~RageTextureLock_OGL()
	{
		ASSERT( m_iTexHandle == 0 ); // locked!
		GLExt.glDeleteBuffersARB( 1, &m_iBuffer );
	}

	/* This is called when our OpenGL context is invalidated. */
	void Invalidate()
	{
		m_iTexHandle = 0;
	}

	void Lock( unsigned iTexHandle, RageSurface *pSurface )
	{
		ASSERT( m_iTexHandle == 0 );
		ASSERT( pSurface->pixels == NULL );

		CreateObject();

		m_iTexHandle = iTexHandle;
		GLExt.glBindBufferARB( GL_PIXEL_UNPACK_BUFFER_ARB, m_iBuffer );

		int iSize = pSurface->h * pSurface->pitch;
		GLExt.glBufferDataARB( GL_PIXEL_UNPACK_BUFFER_ARB, iSize, NULL, GL_STREAM_DRAW );

		void *pSurfaceMemory = GLExt.glMapBufferARB( GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY );
		pSurface->pixels = (uint8_t *) pSurfaceMemory;
		pSurface->pixels_owned = false;
	}

	void Unlock( RageSurface *pSurface, bool bChanged )
	{
		GLExt.glUnmapBufferARB( GL_PIXEL_UNPACK_BUFFER_ARB );

		pSurface->pixels = (uint8_t *) BUFFER_OFFSET(0);

		if( bChanged )
			DISPLAY->UpdateTexture( m_iTexHandle, pSurface, 0, 0, pSurface->w, pSurface->h );

		pSurface->pixels = NULL;

		m_iTexHandle = 0;
		GLExt.glBindBufferARB( GL_PIXEL_UNPACK_BUFFER_ARB, 0 );
	}

private:
	void CreateObject()
	{
		if( m_iBuffer != 0 )
			return;

		DebugFlushGLErrors();
		GLExt.glGenBuffersARB( 1, &m_iBuffer );
		DebugAssertNoGLError();
	}

	GLuint m_iBuffer;

	unsigned m_iTexHandle;
};

RageTextureLock *RageDisplay_OGL::CreateTextureLock()
{
	if( !GLExt.HasExtension("GL_ARB_pixel_buffer_object") )
		return NULL;

	return new RageTextureLock_OGL;
}

void RageDisplay_OGL::UpdateTexture( 
	unsigned iTexHandle, 
	RageSurface* pImg,
	int iXOffset, int iYOffset, int iWidth, int iHeight )
{
	glBindTexture( GL_TEXTURE_2D, iTexHandle );

	bool bFreeImg;
	PixelFormat SurfacePixFmt = GetImgPixelFormat( pImg, bFreeImg, iWidth, iHeight, false );

	glPixelStorei( GL_UNPACK_ROW_LENGTH, pImg->pitch / pImg->format->BytesPerPixel );

	GLenum glImageFormat = g_GLPixFmtInfo[SurfacePixFmt].format;
	GLenum glImageType = g_GLPixFmtInfo[SurfacePixFmt].type;

	/* If the image is paletted, but we're not sending it to a paletted image,
	 * set up glPixelMap. */
	if( pImg->format->palette )
	{
		GLenum glTexFormat = 0;
		glGetTexLevelParameteriv( GL_PROXY_TEXTURE_2D, 0, GLenum(GL_TEXTURE_INTERNAL_FORMAT), (GLint *) &glTexFormat );
		SetPixelMapForSurface( glImageFormat, glTexFormat, pImg->format->palette );
	}

	glTexSubImage2D( GL_TEXTURE_2D, 0,
		iXOffset, iYOffset,
		iWidth, iHeight,
		glImageFormat, glImageType, pImg->pixels );

	/* Must unset PixelStore when we're done! */
	glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
	glFlush();

	if( bFreeImg )
		delete pImg;
}

class RenderTarget_FramebufferObject: public RenderTarget
{
public:
	RenderTarget_FramebufferObject();
	~RenderTarget_FramebufferObject();
	void Create( const RenderTargetParam &param, int &iTextureWidthOut, int &iTextureHeightOut );
	unsigned GetTexture() const { return m_iTexHandle; }
	void StartRenderingTo();
	void FinishRenderingTo();
	
	virtual bool InvertY() const { return true; }

private:
	unsigned int m_iFrameBufferHandle;
	unsigned int m_iTexHandle;
	unsigned int m_iDepthBufferHandle;
};

RenderTarget_FramebufferObject::RenderTarget_FramebufferObject()
{
	m_iFrameBufferHandle = 0;
	m_iTexHandle = 0;
	m_iDepthBufferHandle = 0;
}

RenderTarget_FramebufferObject::~RenderTarget_FramebufferObject()
{
	if( m_iDepthBufferHandle )
		GLExt.glDeleteRenderbuffersEXT( 1, reinterpret_cast<GLuint*>(&m_iDepthBufferHandle) );
	if( m_iFrameBufferHandle )
		GLExt.glDeleteFramebuffersEXT( 1, reinterpret_cast<GLuint*>(&m_iFrameBufferHandle) );
	if( m_iTexHandle )
		glDeleteTextures( 1, reinterpret_cast<GLuint*>(&m_iTexHandle) );
}

void RenderTarget_FramebufferObject::Create( const RenderTargetParam &param, int &iTextureWidthOut, int &iTextureHeightOut )
{
	m_Param = param;

	DebugFlushGLErrors();
	
	// Allocate OpenGL texture resource
	glGenTextures( 1, reinterpret_cast<GLuint*>(&m_iTexHandle) );
	ASSERT( m_iTexHandle );

	int iTextureWidth = power_of_two( param.iWidth );
	int iTextureHeight = power_of_two( param.iHeight );

	iTextureWidthOut = iTextureWidth;
	iTextureHeightOut = iTextureHeight;

	glBindTexture( GL_TEXTURE_2D, m_iTexHandle );
	GLenum internalformat;
	GLenum type = param.bWithAlpha? GL_RGBA:GL_RGB;
	if( param.bFloat && GLExt.m_bGL_ARB_texture_float )
		internalformat = param.bWithAlpha? GL_RGBA16F_ARB:GL_RGB16F_ARB;
	else
		internalformat = param.bWithAlpha? GL_RGBA8:GL_RGB8;
	
	glTexImage2D( GL_TEXTURE_2D, 0, internalformat,
			iTextureWidth, iTextureHeight, 0, type, GL_UNSIGNED_BYTE, NULL );
	DebugAssertNoGLError();

	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
	glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
	glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

	/* Create the framebuffer object. */
	GLExt.glGenFramebuffersEXT( 1, reinterpret_cast<GLuint*>(&m_iFrameBufferHandle) );
	ASSERT( m_iFrameBufferHandle );

	/* Attach the texture to it. */
	GLExt.glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, m_iFrameBufferHandle );
        GLExt.glFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, m_iTexHandle, 0 );
	DebugAssertNoGLError();

	/* Attach a depth buffer, if requested. */
	if( param.bWithDepthBuffer )
	{
		GLExt.glGenRenderbuffersEXT( 1, reinterpret_cast<GLuint*>(&m_iDepthBufferHandle) );
		ASSERT( m_iDepthBufferHandle );

		GLExt.glRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, iTextureWidth, iTextureHeight );
		GLExt.glFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_iDepthBufferHandle );
	}

	GLenum status = GLExt.glCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
	switch(status)
	{
	case GL_FRAMEBUFFER_COMPLETE_EXT:
		break;
	case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
		FAIL_M( "GL_FRAMEBUFFER_UNSUPPORTED_EXT" );
		break;
	case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT" ); break;
	case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT" ); break;
	case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT" ); break;
	case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT" ); break;
	case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT" ); break;
	case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT" ); break;
	default:
		ASSERT(0);
	}

	GLExt.glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
}

void RenderTarget_FramebufferObject::StartRenderingTo()
{
	GLExt.glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, m_iFrameBufferHandle );
}

void RenderTarget_FramebufferObject::FinishRenderingTo()
{
        GLExt.glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
}

bool RageDisplay_OGL::SupportsRenderToTexture() const
{
	return GLExt.m_bGL_EXT_framebuffer_object || g_pWind->SupportsRenderToTexture();
}

/*
 * Render-to-texture can be implemented in several ways: the generic GL_ARB_pixel_buffer_object,
 * or platform-specifically.  PBO is not available on all hardware that supports RTT,
 * particularly GeForce 2, but is simpler and faster when available.
 */

unsigned RageDisplay_OGL::CreateRenderTarget( const RenderTargetParam &param, int &iTextureWidthOut, int &iTextureHeightOut )
{
	RenderTarget *pTarget;
	if( GLExt.m_bGL_EXT_framebuffer_object )
		pTarget = new RenderTarget_FramebufferObject;
	else
		pTarget = g_pWind->CreateRenderTarget();

	pTarget->Create( param, iTextureWidthOut, iTextureHeightOut );

	unsigned iTexture = pTarget->GetTexture();

	ASSERT( g_mapRenderTargets.find(iTexture) == g_mapRenderTargets.end() );
	g_mapRenderTargets[iTexture] = pTarget;
	return iTexture;
}

void RageDisplay_OGL::SetRenderTarget( unsigned iTexture, bool bPreserveTexture )
{
	if( iTexture == 0 )
	{
		g_bInvertY = false;
		glFrontFace( GL_CCW );
		
		/* Pop matrixes affected by SetDefaultRenderStates. */
		DISPLAY->CameraPopMatrix();

		/* Reset the viewport. */
		int fWidth = g_pWind->GetActualVideoModeParams().width;
		int fHeight = g_pWind->GetActualVideoModeParams().height;
		glViewport( 0, 0, fWidth, fHeight );

		if( g_pCurrentRenderTarget )
			g_pCurrentRenderTarget->FinishRenderingTo();
		g_pCurrentRenderTarget = NULL;
		return;
	}

	/* If we already had a render target, disable it. */
	if( g_pCurrentRenderTarget != NULL )
		SetRenderTarget( 0, true );

	/* Enable the new render target. */
	ASSERT( g_mapRenderTargets.find(iTexture) != g_mapRenderTargets.end() );
	RenderTarget *pTarget = g_mapRenderTargets[iTexture];
	pTarget->StartRenderingTo();
	g_pCurrentRenderTarget = pTarget;

	/* Set the viewport to the size of the render target. */
	glViewport( 0, 0, pTarget->GetParam().iWidth, pTarget->GetParam().iHeight );

	/* If this render target implementation flips Y, compensate.   Inverting will
	 * switch the winding order. */
	g_bInvertY = pTarget->InvertY();
	if( g_bInvertY )
		glFrontFace( GL_CW );

	/* The render target may be in a different OpenGL context, so re-send
	 * state.  Push matrixes affected by SetDefaultRenderStates. */
	DISPLAY->CameraPushMatrix();
	SetDefaultRenderStates();

	/* Clear the texture, if requested.  Always set the associated state, for
	 * consistency. */
	glClearColor( 0,0,0,0 );
	SetZWrite( true );

	/* If bPreserveTexture is false, clear the render target.  Only clear the depth
	 * buffer if the target has one; otherwise we're clearing the real depth buffer. */
	if( !bPreserveTexture )
	{
		int iBit = GL_COLOR_BUFFER_BIT;
		if( pTarget->GetParam().bWithDepthBuffer )
			iBit |= GL_DEPTH_BUFFER_BIT;
		glClear( iBit );
	}
}

void RageDisplay_OGL::SetPolygonMode( PolygonMode pm )
{
	GLenum m;
	switch( pm )
	{
	case POLYGON_FILL:	m = GL_FILL; break;
	case POLYGON_LINE:	m = GL_LINE; break;
	default:		ASSERT(0);	return;
	}
	glPolygonMode( GL_FRONT_AND_BACK, m );
}

void RageDisplay_OGL::SetLineWidth( float fWidth )
{
	glLineWidth( fWidth );
}

RString RageDisplay_OGL::GetTextureDiagnostics( unsigned iTexture ) const
{
	/*
		s << (bGenerateMipMaps? "gluBuild2DMipmaps":"glTexImage2D");
		s << "(format " << GLToString(glTexFormat) <<
				", " << pImg->w << "x" <<  pImg->h <<
				", format " << GLToString(iFormat) <<
				", type " << GLToString(glImageType) <<
				", pixfmt " << pixfmt <<
				", imgpixfmt " << SurfacePixFmt <<
				")";
		LOG->Trace( "%s", s.str().c_str() );

	glBindTexture( GL_TEXTURE_2D, iTexture );

		GLint iWidth;
		glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GLenum(GL_TEXTURE_WIDTH), (GLint *) &iWidth );
		GLint iHeight;
		glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GLenum(GL_TEXTURE_HEIGHT), (GLint *) &iHeight );
		GLint iFormat;
		glGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GLenum(GL_TEXTURE_INTERNAL_FORMAT), (GLint *) &iFormat );

		GL_CHECK_ERROR( "glGetTexLevelParameteriv(GL_TEXTURE_INTERNAL_FORMAT)" );
		if( iFormat != glTexFormat )
		{
			sError = ssprintf( "Expected format %s, got %s instead",
					GLToString(glTexFormat).c_str(), GLToString(iFormat).c_str() );
			break;
		}
*/
	return RString();
}

void RageDisplay_OGL::SetAlphaTest( bool b )
{
	glAlphaFunc( GL_GREATER, 0.01f );
	if( b )
		glEnable( GL_ALPHA_TEST );
	else
		glDisable( GL_ALPHA_TEST );
}


/*
 * Although we pair texture formats (eg. GL_RGB8) and surface formats
 * (pairs of eg. GL_RGB8,GL_UNSIGNED_SHORT_5_5_5_1), it's possible for
 * a format to be supported for a texture format but not a surface
 * format.  This is abstracted, so you don't need to know about this
 * as a user calling CreateTexture.
 *
 * One case of this is if packed pixels aren't supported.  We can still
 * use 16-bit color modes, but we have to send it in 32-bit.  Almost
 * everything supports packed pixels.
 *
 * Another case of this is incomplete packed pixels support.  Some implementations
 * neglect GL_UNSIGNED_SHORT_*_REV. 
 */
bool RageDisplay_OGL::SupportsSurfaceFormat( PixelFormat pixfmt )
{
	switch( g_GLPixFmtInfo[pixfmt].type )
	{
	case GL_UNSIGNED_SHORT_1_5_5_5_REV:
		return GLExt.m_bGL_EXT_bgra && g_bReversePackedPixelsWorks;
	default:
		return true;
	}
}


bool RageDisplay_OGL::SupportsTextureFormat( PixelFormat pixfmt, bool bRealtime )
{
	/* If we support a pixfmt for texture formats but not for surface formats, then
	 * we'll have to convert the texture to a supported surface format before uploading.
	 * This is too slow for dynamic textures. */
	if( bRealtime && !SupportsSurfaceFormat(pixfmt) )
		return false;

	switch( g_GLPixFmtInfo[pixfmt].format )
	{
	case GL_COLOR_INDEX:
		return GLExt.glColorTableEXT && GLExt.glGetColorTableParameterivEXT;
	case GL_BGR:
	case GL_BGRA:
		return GLExt.m_bGL_EXT_bgra;
	default:
		return true;
	}
}

bool RageDisplay_OGL::SupportsPerVertexMatrixScale()
{
	// Intel i915 on OSX 10.4.4 supports vertex programs but not hardware vertex buffers.
	// Our software vertex rendering doesn't support vertex programs.
	return GLExt.glGenBuffersARB  &&  g_bTextureMatrixShader != 0;
}

void RageDisplay_OGL::SetSphereEnvironmentMapping( TextureUnit tu, bool b )
{
	if( !SetTextureUnit( tu ) )
		return;

	if( b )
	{
		glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP );
		glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP );
		glEnable( GL_TEXTURE_GEN_S );
		glEnable( GL_TEXTURE_GEN_T );
	}
	else
	{
		glDisable( GL_TEXTURE_GEN_S );
		glDisable( GL_TEXTURE_GEN_T );
	}
}

/*
 * Copyright (c) 2001-2004 Chris Danford, Glenn Maynard
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons to
 * whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
 * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
 * INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
 * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */