/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2000-2013 Darklegion Development
Copyright (C) 2015-2019 GrangerHub

This file is part of Tremulous.

Tremulous is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.

Tremulous 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with Tremulous; if not, see <https://www.gnu.org/licenses/>

===========================================================================
*/
// tr_init.c -- functions that are not called every frame

#include "tr_local.h"

glconfig_t  glConfig;
glstate_t	glState;

static void GfxInfo_f( void );

#ifdef USE_RENDERER_DLOPEN
cvar_t  *com_altivec;
#endif

cvar_t	*r_flareSize;
cvar_t	*r_flareFade;
cvar_t	*r_flareCoeff;

cvar_t	*r_railWidth;
cvar_t	*r_railCoreWidth;
cvar_t	*r_railSegmentLength;

cvar_t	*r_ignoreFastPath;

cvar_t	*r_verbose;
cvar_t	*r_ignore;

cvar_t  *r_displayRefresh;

cvar_t	*r_detailTextures;

cvar_t	*r_znear;
cvar_t	*r_zproj;
cvar_t	*r_stereoSeparation;

cvar_t	*r_skipBackEnd;

cvar_t	*r_stereoEnabled;
cvar_t	*r_anaglyphMode;

cvar_t	*r_greyscale;

cvar_t	*r_ignorehwgamma;
cvar_t	*r_measureOverdraw;

cvar_t	*r_inGameVideo;
cvar_t	*r_fastsky;
cvar_t	*r_drawSun;
cvar_t	*r_dynamiclight;
cvar_t	*r_dlightBacks;

cvar_t	*r_lodbias;
cvar_t	*r_lodscale;

cvar_t	*r_norefresh;
cvar_t	*r_drawentities;
cvar_t	*r_drawworld;
cvar_t	*r_speeds;
cvar_t	*r_fullbright;
cvar_t	*r_novis;
cvar_t	*r_nocull;
cvar_t	*r_facePlaneCull;
cvar_t	*r_showcluster;
cvar_t	*r_nocurves;

cvar_t	*r_allowExtensions;

cvar_t	*r_ext_compressed_textures;
cvar_t	*r_ext_multitexture;
cvar_t	*r_ext_compiled_vertex_array;
cvar_t	*r_ext_texture_env_add;
cvar_t	*r_ext_texture_filter_anisotropic;
cvar_t	*r_ext_max_anisotropy;

cvar_t	*r_ignoreGLErrors;
cvar_t	*r_logFile;

cvar_t	*r_stencilbits;
cvar_t	*r_depthbits;
cvar_t	*r_colorbits;
cvar_t	*r_alphabits;
cvar_t	*r_primitives;
cvar_t	*r_texturebits;
cvar_t  *r_ext_multisample;

cvar_t	*r_drawBuffer;
cvar_t	*r_lightmap;
cvar_t	*r_vertexLight;
cvar_t	*r_uiFullScreen;
cvar_t	*r_shadows;
cvar_t	*r_flares;
cvar_t	*r_nobind;
cvar_t	*r_singleShader;
cvar_t	*r_roundImagesDown;
cvar_t	*r_colorMipLevels;
cvar_t	*r_picmip;
cvar_t	*r_showtris;
cvar_t	*r_showsky;
cvar_t	*r_shownormals;
cvar_t	*r_finish;
cvar_t	*r_clear;
cvar_t	*r_swapInterval;
cvar_t	*r_textureMode;
cvar_t	*r_offsetFactor;
cvar_t	*r_offsetUnits;
cvar_t	*r_gamma;
cvar_t	*r_intensity;
cvar_t	*r_lockpvs;
cvar_t	*r_noportals;
cvar_t	*r_portalOnly;

cvar_t	*r_subdivisions;
cvar_t	*r_lodCurveError;

cvar_t	*r_fullscreen;
cvar_t  *r_noborder;

cvar_t	*r_width;
cvar_t	*r_height;
cvar_t	*r_pixelAspect;

cvar_t	*r_overBrightBits;
cvar_t	*r_mapOverBrightBits;

cvar_t	*r_debugSurface;
cvar_t	*r_simpleMipMaps;

cvar_t	*r_showImages;

cvar_t	*r_ambientScale;
cvar_t	*r_directedScale;
cvar_t	*r_debugLight;
cvar_t	*r_debugSort;
cvar_t	*r_printShaders;
cvar_t	*r_saveFontData;

cvar_t	*r_marksOnTriangleMeshes;

cvar_t	*r_aviMotionJpegQuality;
cvar_t	*r_screenshotJpegQuality;

cvar_t	*r_maxpolys;
int		max_polys;
cvar_t	*r_maxpolyverts;
int		max_polyverts;

#define GENERIC_HW_R_PICMIP_DEFAULT				"0"
#define GENERIC_HW_R_TEXTUREMODE_DEFAULT	"GL_LINEAR_MIPMAP_LINEAR"

/*
** InitOpenGL
**
** This function is responsible for initializing a valid OpenGL subsystem.  This
** is done by calling GLimp_Init (which gives us a working OGL subsystem) then
** setting variables, checking GL constants, and reporting the gfx system config
** to the user.
*/
static void InitOpenGL( void )
{
	char renderer_buffer[1024];

	//
	// initialize OS specific portions of the renderer
	//
	// GLimp_Init directly or indirectly references the following cvars:
	//		- r_fullscreen
	//		- r_(width|height|pixelAspect)
	//		- r_(color|depth|stencil)bits
	//		- r_ignorehwgamma
	//		- r_gamma
	//
	
	if ( glConfig.vidWidth == 0 )
	{
		GLint		temp;
		
		GLimp_Init( qfalse );

		strcpy( renderer_buffer, glConfig.renderer_string );
		Q_strlwr( renderer_buffer );

		// OpenGL driver constants
		qglGetIntegerv( GL_MAX_TEXTURE_SIZE, &temp );
		glConfig.maxTextureSize = temp;

		// stubbed or broken drivers may have reported 0...
		if ( glConfig.maxTextureSize <= 0 ) 
		{
			glConfig.maxTextureSize = 0;
		}
	}

	// set default state
	GL_SetDefaultState();
}

/*
==================
GL_CheckErrors
==================
*/
void GL_CheckErrors( void ) {
	int		err;
	char	s[64];

	err = qglGetError();
	if ( err == GL_NO_ERROR ) {
		return;
	}
	if ( r_ignoreGLErrors->integer ) {
		return;
	}
	switch( err ) {
		case GL_INVALID_ENUM:
			strcpy( s, "GL_INVALID_ENUM" );
			break;
		case GL_INVALID_VALUE:
			strcpy( s, "GL_INVALID_VALUE" );
			break;
		case GL_INVALID_OPERATION:
			strcpy( s, "GL_INVALID_OPERATION" );
			break;
		case GL_STACK_OVERFLOW:
			strcpy( s, "GL_STACK_OVERFLOW" );
			break;
		case GL_STACK_UNDERFLOW:
			strcpy( s, "GL_STACK_UNDERFLOW" );
			break;
		case GL_OUT_OF_MEMORY:
			strcpy( s, "GL_OUT_OF_MEMORY" );
			break;
		default:
			Com_sprintf( s, sizeof(s), "%i", err);
			break;
	}

	ri.Error( ERR_FATAL, "GL_CheckErrors: %s", s );
}


/* 
============================================================================== 
 
						SCREEN SHOTS 

NOTE TTimo
some thoughts about the screenshots system:
screenshots get written in fs_homepath + fs_gamedir
vanilla q3 .. baseq3/screenshots/ *.tga
team arena .. missionpack/screenshots/ *.tga

two commands: "screenshot" and "screenshotJPEG"
we use statics to store a count and start writing the first screenshot/screenshot????.tga (.jpg) available
(with FS_FileExists / FS_FOpenFileWrite calls)
FIXME: the statics don't get a reinit between fs_game changes

============================================================================== 
*/ 

/* 
================== 
RB_ReadPixels

Reads an image but takes care of alignment issues for reading RGB images.

Reads a minimum offset for where the RGB data starts in the image from
integer stored at pointer offset. When the function has returned the actual
offset was written back to address offset. This address will always have an
alignment of packAlign to ensure efficient copying.

Stores the length of padding after a line of pixels to address padlen

Return value must be freed with ri.Hunk_FreeTempMemory()
================== 
*/  

byte *RB_ReadPixels(int x, int y, int width, int height, size_t *offset, int *padlen)
{
	byte *buffer, *bufstart;
	int padwidth, linelen;
	GLint packAlign;
	
	qglGetIntegerv(GL_PACK_ALIGNMENT, &packAlign);
	
	linelen = width * 3;
	padwidth = PAD(linelen, packAlign);
	
	// Allocate a few more bytes so that we can choose an alignment we like
	buffer = (byte*)ri.Hunk_AllocateTempMemory(padwidth * height + *offset + packAlign - 1);
	
	bufstart = (byte*)PADP((intptr_t) buffer + *offset, packAlign);
	qglReadPixels(x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, bufstart);
	
	*offset = bufstart - buffer;
	*padlen = padwidth - linelen;
	
	return buffer;
}

/* 
================== 
RB_TakeScreenshot
================== 
*/  
void RB_TakeScreenshot(int x, int y, int width, int height, char *fileName)
{
	byte *allbuf, *buffer;
	byte *srcptr, *destptr;
	byte *endline, *endmem;
	byte temp;
	
	int linelen, padlen;
	size_t offset = 18, memcount;
		
	allbuf = RB_ReadPixels(x, y, width, height, &offset, &padlen);
	buffer = allbuf + offset - 18;
	
	Com_Memset (buffer, 0, 18);
	buffer[2] = 2;		// uncompressed type
	buffer[12] = width & 255;
	buffer[13] = width >> 8;
	buffer[14] = height & 255;
	buffer[15] = height >> 8;
	buffer[16] = 24;	// pixel size

	// swap rgb to bgr and remove padding from line endings
	linelen = width * 3;
	
	srcptr = destptr = allbuf + offset;
	endmem = srcptr + (linelen + padlen) * height;
	
	while(srcptr < endmem)
	{
		endline = srcptr + linelen;

		while(srcptr < endline)
		{
			temp = srcptr[0];
			*destptr++ = srcptr[2];
			*destptr++ = srcptr[1];
			*destptr++ = temp;
			
			srcptr += 3;
		}
		
		// Skip the pad
		srcptr += padlen;
	}

	memcount = linelen * height;

	// gamma correct
	if(glConfig.deviceSupportsGamma)
		R_GammaCorrect(allbuf + offset, memcount);

	ri.FS_WriteFile(fileName, buffer, memcount + 18);

	ri.Hunk_FreeTempMemory(allbuf);
}

/* 
================== 
RB_TakeScreenshotJPEG
================== 
*/

void RB_TakeScreenshotJPEG(int x, int y, int width, int height, char *fileName)
{
	byte *buffer;
	size_t offset = 0, memcount;
	int padlen;

	buffer = RB_ReadPixels(x, y, width, height, &offset, &padlen);
	memcount = (width * 3 + padlen) * height;

	// gamma correct
	if(glConfig.deviceSupportsGamma)
		R_GammaCorrect(buffer + offset, memcount);

	RE_SaveJPG(fileName, r_screenshotJpegQuality->integer, width, height, buffer + offset, padlen);
	ri.Hunk_FreeTempMemory(buffer);
}

/*
==================
RB_TakeScreenshotCmd
==================
*/
const void *RB_TakeScreenshotCmd( const void *data ) {
	const screenshotCommand_t	*cmd;
	
	cmd = (const screenshotCommand_t *)data;
	
	if (cmd->jpeg)
		RB_TakeScreenshotJPEG( cmd->x, cmd->y, cmd->width, cmd->height, cmd->fileName);
	else
		RB_TakeScreenshot( cmd->x, cmd->y, cmd->width, cmd->height, cmd->fileName);
	
	return (const void *)(cmd + 1);	
}

/*
==================
R_TakeScreenshot
==================
*/
void R_TakeScreenshot( int x, int y, int width, int height, char *name, bool jpeg ) {
	static char	fileName[MAX_OSPATH]; // bad things if two screenshots per frame?
	screenshotCommand_t	*cmd;

	cmd = (screenshotCommand_t*)R_GetCommandBuffer( sizeof( *cmd ) );
	if ( !cmd ) {
		return;
	}
	cmd->commandId = RC_SCREENSHOT;

	cmd->x = x;
	cmd->y = y;
	cmd->width = width;
	cmd->height = height;
	Q_strncpyz( fileName, name, sizeof(fileName) );
	cmd->fileName = fileName;
	cmd->jpeg = jpeg;
}

/* 
================== 
R_ScreenshotFilename
================== 
*/  
void R_ScreenshotFilename( int lastNumber, char *fileName ) {
	int		a,b,c,d;

	if ( lastNumber < 0 || lastNumber > 9999 ) {
		Com_sprintf( fileName, MAX_OSPATH, "screenshots/shot9999.tga" );
		return;
	}

	a = lastNumber / 1000;
	lastNumber -= a*1000;
	b = lastNumber / 100;
	lastNumber -= b*100;
	c = lastNumber / 10;
	lastNumber -= c*10;
	d = lastNumber;

	Com_sprintf( fileName, MAX_OSPATH, "screenshots/shot%i%i%i%i.tga"
		, a, b, c, d );
}

/* 
================== 
R_ScreenshotFilename
================== 
*/  
void R_ScreenshotFilenameJPEG( int lastNumber, char *fileName ) {
	int		a,b,c,d;

	if ( lastNumber < 0 || lastNumber > 9999 ) {
		Com_sprintf( fileName, MAX_OSPATH, "screenshots/shot9999.jpg" );
		return;
	}

	a = lastNumber / 1000;
	lastNumber -= a*1000;
	b = lastNumber / 100;
	lastNumber -= b*100;
	c = lastNumber / 10;
	lastNumber -= c*10;
	d = lastNumber;

	Com_sprintf( fileName, MAX_OSPATH, "screenshots/shot%i%i%i%i.jpg"
		, a, b, c, d );
}

/*
====================
R_LevelShot

levelshots are specialized 128*128 thumbnails for
the menu system, sampled down from full screen distorted images
====================
*/
void R_LevelShot( void ) {
	char		checkname[MAX_OSPATH];
	byte		*buffer;
	byte		*source, *allsource;
	byte		*src, *dst;
	size_t			offset = 0;
	int			padlen;
	int			x, y;
	int			r, g, b;
	float		xScale, yScale;
	int			xx, yy;

	Com_sprintf(checkname, sizeof(checkname), "levelshots/%s.tga", tr.world->baseName);

	allsource = RB_ReadPixels(0, 0, glConfig.vidWidth, glConfig.vidHeight, &offset, &padlen);
	source = allsource + offset;

	buffer = (byte*)ri.Hunk_AllocateTempMemory(128 * 128*3 + 18);
	Com_Memset (buffer, 0, 18);
	buffer[2] = 2;		// uncompressed type
	buffer[12] = 128;
	buffer[14] = 128;
	buffer[16] = 24;	// pixel size

	// resample from source
	xScale = glConfig.vidWidth / 512.0f;
	yScale = glConfig.vidHeight / 384.0f;
	for ( y = 0 ; y < 128 ; y++ ) {
		for ( x = 0 ; x < 128 ; x++ ) {
			r = g = b = 0;
			for ( yy = 0 ; yy < 3 ; yy++ ) {
				for ( xx = 0 ; xx < 4 ; xx++ ) {
					src = source + (3 * glConfig.vidWidth + padlen) * (int)((y*3 + yy) * yScale) +
						3 * (int) ((x*4 + xx) * xScale);
					r += src[0];
					g += src[1];
					b += src[2];
				}
			}
			dst = buffer + 18 + 3 * ( y * 128 + x );
			dst[0] = b / 12;
			dst[1] = g / 12;
			dst[2] = r / 12;
		}
	}

	// gamma correct
	if ( glConfig.deviceSupportsGamma ) {
		R_GammaCorrect( buffer + 18, 128 * 128 * 3 );
	}

	ri.FS_WriteFile( checkname, buffer, 128 * 128*3 + 18 );

	ri.Hunk_FreeTempMemory(buffer);
	ri.Hunk_FreeTempMemory(allsource);

	ri.Printf( PRINT_ALL, "Wrote %s\n", checkname );
}

/* 
================== 
R_ScreenShot_f

screenshot
screenshot [silent]
screenshot [levelshot]
screenshot [filename]

Doesn't print the pacifier message if there is a second arg
================== 
*/  
void R_ScreenShot_f (void) {
	char	checkname[MAX_OSPATH];
	static	int	lastNumber = -1;
	bool	silent;

	if ( !strcmp( ri.Cmd_Argv(1), "levelshot" ) ) {
		R_LevelShot();
		return;
	}

	if ( !strcmp( ri.Cmd_Argv(1), "silent" ) ) {
		silent = true;
	} else {
		silent = false;
	}

	if ( ri.Cmd_Argc() == 2 && !silent ) {
		// explicit filename
		Com_sprintf( checkname, MAX_OSPATH, "screenshots/%s.tga", ri.Cmd_Argv( 1 ) );
	} else {
		// scan for a free filename

		// if we have saved a previous screenshot, don't scan
		// again, because recording demo avis can involve
		// thousands of shots
		if ( lastNumber == -1 ) {
			lastNumber = 0;
		}
		// scan for a free number
		for ( ; lastNumber <= 9999 ; lastNumber++ ) {
			R_ScreenshotFilename( lastNumber, checkname );

      if (!ri.FS_FileExists( checkname ))
      {
        break; // file doesn't exist
      }
		}

		if ( lastNumber >= 9999 ) {
			ri.Printf (PRINT_ALL, "ScreenShot: Couldn't create a file\n"); 
			return;
 		}

		lastNumber++;
	}

	R_TakeScreenshot( 0, 0, glConfig.vidWidth, glConfig.vidHeight, checkname, false );

	if ( !silent ) {
		ri.Printf (PRINT_ALL, "Wrote %s\n", checkname);
	}
} 

void R_ScreenShotJPEG_f (void) {
	char		checkname[MAX_OSPATH];
	static	int	lastNumber = -1;
	bool	silent;

	if ( !strcmp( ri.Cmd_Argv(1), "levelshot" ) ) {
		R_LevelShot();
		return;
	}

	if ( !strcmp( ri.Cmd_Argv(1), "silent" ) ) {
		silent = true;
	} else {
		silent = false;
	}

	if ( ri.Cmd_Argc() == 2 && !silent ) {
		// explicit filename
		Com_sprintf( checkname, MAX_OSPATH, "screenshots/%s.jpg", ri.Cmd_Argv( 1 ) );
	} else {
		// scan for a free filename

		// if we have saved a previous screenshot, don't scan
		// again, because recording demo avis can involve
		// thousands of shots
		if ( lastNumber == -1 ) {
			lastNumber = 0;
		}
		// scan for a free number
		for ( ; lastNumber <= 9999 ; lastNumber++ ) {
			R_ScreenshotFilenameJPEG( lastNumber, checkname );

      if (!ri.FS_FileExists( checkname ))
      {
        break; // file doesn't exist
      }
		}

		if ( lastNumber == 10000 ) {
			ri.Printf (PRINT_ALL, "ScreenShot: Couldn't create a file\n"); 
			return;
 		}

		lastNumber++;
	}

	R_TakeScreenshot( 0, 0, glConfig.vidWidth, glConfig.vidHeight, checkname, true );

	if ( !silent ) {
		ri.Printf (PRINT_ALL, "Wrote %s\n", checkname);
	}
} 

//============================================================================

/*
==================
RB_TakeVideoFrameCmd
==================
*/
const void *RB_TakeVideoFrameCmd( const void *data )
{
	const videoFrameCommand_t	*cmd;
	byte				*cBuf;
	size_t				memcount, linelen;
	int				padwidth, avipadwidth, padlen, avipadlen;
	GLint packAlign;
	
	cmd = (const videoFrameCommand_t *)data;
	
	qglGetIntegerv(GL_PACK_ALIGNMENT, &packAlign);

	linelen = cmd->width * 3;

	// Alignment stuff for glReadPixels
	padwidth = PAD(linelen, packAlign);
	padlen = padwidth - linelen;
	// AVI line padding
	avipadwidth = PAD(linelen, AVI_LINE_PADDING);
	avipadlen = avipadwidth - linelen;

	cBuf = (byte*)PADP(cmd->captureBuffer, packAlign);
		
	qglReadPixels(0, 0, cmd->width, cmd->height, GL_RGB,
		GL_UNSIGNED_BYTE, cBuf);

	memcount = padwidth * cmd->height;

	// gamma correct
	if(glConfig.deviceSupportsGamma)
		R_GammaCorrect(cBuf, memcount);

	if(cmd->motionJpeg)
	{
		memcount = RE_SaveJPGToBuffer(cmd->encodeBuffer, linelen * cmd->height,
			r_aviMotionJpegQuality->integer,
			cmd->width, cmd->height, cBuf, padlen);
		ri.CL_WriteAVIVideoFrame(cmd->encodeBuffer, memcount);
	}
	else
	{
		byte *lineend, *memend;
		byte *srcptr, *destptr;
	
		srcptr = cBuf;
		destptr = cmd->encodeBuffer;
		memend = srcptr + memcount;
		
		// swap R and B and remove line paddings
		while(srcptr < memend)
		{
			lineend = srcptr + linelen;
			while(srcptr < lineend)
			{
				*destptr++ = srcptr[2];
				*destptr++ = srcptr[1];
				*destptr++ = srcptr[0];
				srcptr += 3;
			}
			
			Com_Memset(destptr, '\0', avipadlen);
			destptr += avipadlen;
			
			srcptr += padlen;
		}
		
		ri.CL_WriteAVIVideoFrame(cmd->encodeBuffer, avipadwidth * cmd->height);
	}

	return (const void *)(cmd + 1);	
}

//============================================================================

/*
** GL_SetDefaultState
*/
void GL_SetDefaultState( void )
{
	qglClearDepth( 1.0f );

	qglCullFace(GL_FRONT);

	qglColor4f (1,1,1,1);

	// initialize downstream texture unit if we're running
	// in a multitexture environment
	if ( qglActiveTextureARB ) {
		GL_SelectTexture( 1 );
		GL_TextureMode( r_textureMode->string );
		GL_TexEnv( GL_MODULATE );
		qglDisable( GL_TEXTURE_2D );
		GL_SelectTexture( 0 );
	}

	qglEnable(GL_TEXTURE_2D);
	GL_TextureMode( r_textureMode->string );
	GL_TexEnv( GL_MODULATE );

	qglShadeModel( GL_SMOOTH );
	qglDepthFunc( GL_LEQUAL );

	// the vertex array is always enabled, but the color and texture
	// arrays are enabled and disabled around the compiled vertex array call
	qglEnableClientState (GL_VERTEX_ARRAY);

	//
	// make sure our GL state vector is set correctly
	//
	glState.glStateBits = GLS_DEPTHTEST_DISABLE | GLS_DEPTHMASK_TRUE;

	qglPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
	qglDepthMask( GL_TRUE );
	qglDisable( GL_DEPTH_TEST );
	qglEnable( GL_SCISSOR_TEST );
	qglDisable( GL_CULL_FACE );
	qglDisable( GL_BLEND );
}

/*
================
R_PrintLongString

Workaround for ri.Printf's 1024 characters buffer limit.
================
*/
void R_PrintLongString(const char *string) {
	char buffer[1024];
	const char *p;
	int size = strlen(string);

	p = string;
	while(size > 0)
	{
		Q_strncpyz(buffer, p, sizeof (buffer) );
		ri.Printf( PRINT_ALL, "%s", buffer );
		p += 1023;
		size -= 1023;
	}
}

/*
================
GfxInfo_f
================
*/
void GfxInfo_f( void ) 
{
	const char *enablestrings[] =
	{
		"disabled",
		"enabled"
	};
	const char *fsstrings[] =
	{
		"windowed",
		"fullscreen"
	};

	ri.Printf( PRINT_ALL, "\nGL_VENDOR: %s\n", glConfig.vendor_string );
	ri.Printf( PRINT_ALL, "GL_RENDERER: %s\n", glConfig.renderer_string );
	ri.Printf( PRINT_ALL, "GL_VERSION: %s\n", glConfig.version_string );
	ri.Printf( PRINT_ALL, "GL_EXTENSIONS: " );
	R_PrintLongString( glConfig.extensions_string );
	ri.Printf( PRINT_ALL, "\n" );
	ri.Printf( PRINT_ALL, "GL_MAX_TEXTURE_SIZE: %d\n", glConfig.maxTextureSize );
	ri.Printf( PRINT_ALL, "GL_MAX_TEXTURE_UNITS_ARB: %d\n", glConfig.numTextureUnits );
	ri.Printf( PRINT_ALL, "\nPIXELFORMAT: color(%d-bits) Z(%d-bit) stencil(%d-bits)\n", glConfig.colorBits, glConfig.depthBits, glConfig.stencilBits );
	ri.Printf( PRINT_ALL, "MODE: %d x %d %s hz:", glConfig.vidWidth, glConfig.vidHeight, fsstrings[r_fullscreen->integer == 1] );
	if ( glConfig.displayFrequency )
	{
		ri.Printf( PRINT_ALL, "%d\n", glConfig.displayFrequency );
	}
	else
	{
		ri.Printf( PRINT_ALL, "N/A\n" );
	}
	if ( glConfig.deviceSupportsGamma )
	{
		ri.Printf( PRINT_ALL, "GAMMA: hardware w/ %d overbright bits\n", tr.overbrightBits );
	}
	else
	{
		ri.Printf( PRINT_ALL, "GAMMA: software w/ %d overbright bits\n", tr.overbrightBits );
	}

	// rendering primitives
	{
		int		primitives;

		// default is to use triangles if compiled vertex arrays are present
		ri.Printf( PRINT_ALL, "rendering primitives: " );
		primitives = r_primitives->integer;
		if ( primitives == 0 ) {
			if ( qglLockArraysEXT ) {
				primitives = 2;
			} else {
				primitives = 1;
			}
		}
		if ( primitives == -1 ) {
			ri.Printf( PRINT_ALL, "none\n" );
		} else if ( primitives == 2 ) {
			ri.Printf( PRINT_ALL, "single glDrawElements\n" );
		} else if ( primitives == 1 ) {
			ri.Printf( PRINT_ALL, "multiple glArrayElement\n" );
		} else if ( primitives == 3 ) {
			ri.Printf( PRINT_ALL, "multiple glColor4ubv + glTexCoord2fv + glVertex3fv\n" );
		}
	}

	ri.Printf( PRINT_ALL, "texturemode: %s\n", r_textureMode->string );
	ri.Printf( PRINT_ALL, "picmip: %d\n", r_picmip->integer );
	ri.Printf( PRINT_ALL, "texture bits: %d\n", r_texturebits->integer );
	ri.Printf( PRINT_ALL, "multitexture: %s\n", enablestrings[qglActiveTextureARB != 0] );
	ri.Printf( PRINT_ALL, "compiled vertex arrays: %s\n", enablestrings[qglLockArraysEXT != 0 ] );
	ri.Printf( PRINT_ALL, "texenv add: %s\n", enablestrings[glConfig.textureEnvAddAvailable != 0] );
	ri.Printf( PRINT_ALL, "compressed textures: %s\n", enablestrings[glConfig.textureCompression!=TC_NONE] );
	if ( r_vertexLight->integer || glConfig.hardwareType == GLHW_PERMEDIA2 )
	{
		ri.Printf( PRINT_ALL, "HACK: using vertex lightmap approximation\n" );
	}
	if ( glConfig.hardwareType == GLHW_RAGEPRO )
	{
		ri.Printf( PRINT_ALL, "HACK: ragePro approximations\n" );
	}
	if ( glConfig.hardwareType == GLHW_RIVA128 )
	{
		ri.Printf( PRINT_ALL, "HACK: riva128 approximations\n" );
	}
	if ( r_finish->integer ) {
		ri.Printf( PRINT_ALL, "Forcing glFinish\n" );
	}
}

/*
===============
R_Register
===============
*/
void R_Register( void ) 
{
	#ifdef USE_RENDERER_DLOPEN
	com_altivec = ri.Cvar_Get("com_altivec", "1", CVAR_ARCHIVE);
	#endif	

	//
	// latched and archived variables
	//
	r_allowExtensions = ri.Cvar_Get( "r_allowExtensions", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_ext_compressed_textures = ri.Cvar_Get( "r_ext_compressed_textures", "0", CVAR_ARCHIVE | CVAR_LATCH );
	r_ext_multitexture = ri.Cvar_Get( "r_ext_multitexture", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_ext_compiled_vertex_array = ri.Cvar_Get( "r_ext_compiled_vertex_array", "1", CVAR_ARCHIVE | CVAR_LATCH);
	r_ext_texture_env_add = ri.Cvar_Get( "r_ext_texture_env_add", "1", CVAR_ARCHIVE | CVAR_LATCH);

	r_picmip = ri.Cvar_Get ("r_picmip", GENERIC_HW_R_PICMIP_DEFAULT,
			CVAR_ARCHIVE | CVAR_LATCH );
	r_ext_texture_filter_anisotropic = ri.Cvar_Get( "r_ext_texture_filter_anisotropic",
			"0", CVAR_ARCHIVE | CVAR_LATCH );
	r_ext_max_anisotropy = ri.Cvar_Get( "r_ext_max_anisotropy", "2", CVAR_ARCHIVE | CVAR_LATCH );

	r_roundImagesDown = ri.Cvar_Get ("r_roundImagesDown", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_colorMipLevels = ri.Cvar_Get ("r_colorMipLevels", "0", CVAR_LATCH );
	ri.Cvar_CheckRange( r_picmip, 0, 16, true );
	r_detailTextures = ri.Cvar_Get( "r_detailtextures", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_texturebits = ri.Cvar_Get( "r_texturebits", "0", CVAR_ARCHIVE | CVAR_LATCH );
	r_colorbits = ri.Cvar_Get( "r_colorbits", "0", CVAR_ARCHIVE | CVAR_LATCH );
	r_alphabits = ri.Cvar_Get( "r_alphabits", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_stencilbits = ri.Cvar_Get( "r_stencilbits", "8", CVAR_ARCHIVE | CVAR_LATCH );
	r_depthbits = ri.Cvar_Get( "r_depthbits", "0", CVAR_ARCHIVE | CVAR_LATCH );
	r_ext_multisample = ri.Cvar_Get( "r_ext_multisample", "0", CVAR_ARCHIVE | CVAR_LATCH );
	ri.Cvar_CheckRange( r_ext_multisample, 0, 4, true );
	r_overBrightBits = ri.Cvar_Get ("r_overBrightBits", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_ignorehwgamma = ri.Cvar_Get( "r_ignorehwgamma", "0", CVAR_ARCHIVE | CVAR_LATCH);
	r_fullscreen = ri.Cvar_Get( "r_fullscreen", "1", CVAR_ARCHIVE );
	r_noborder = ri.Cvar_Get("r_noborder", "0", CVAR_ARCHIVE | CVAR_LATCH);
	r_width = ri.Cvar_Get( "r_width", "0", CVAR_ARCHIVE | CVAR_LATCH );
	r_height = ri.Cvar_Get( "r_height", "0", CVAR_ARCHIVE | CVAR_LATCH );
	r_pixelAspect = ri.Cvar_Get( "r_pixelAspect", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_simpleMipMaps = ri.Cvar_Get( "r_simpleMipMaps", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_vertexLight = ri.Cvar_Get( "r_vertexLight", "0", CVAR_ARCHIVE | CVAR_LATCH );
	r_uiFullScreen = ri.Cvar_Get( "r_uifullscreen", "0", 0);
	r_subdivisions = ri.Cvar_Get ("r_subdivisions", "4", CVAR_ARCHIVE | CVAR_LATCH);
	r_stereoEnabled = ri.Cvar_Get( "r_stereoEnabled", "0", CVAR_ARCHIVE | CVAR_LATCH);
	r_ignoreFastPath = ri.Cvar_Get( "r_ignoreFastPath", "1", CVAR_ARCHIVE | CVAR_LATCH );
	r_greyscale = ri.Cvar_Get("r_greyscale", "0", CVAR_ARCHIVE | CVAR_LATCH);
	ri.Cvar_CheckRange(r_greyscale, 0, 1, false);

	//
	// temporary latched variables that can only change over a restart
	//
	r_displayRefresh = ri.Cvar_Get( "r_displayRefresh", "0", CVAR_LATCH );
	ri.Cvar_CheckRange( r_displayRefresh, 0, 200, true );
	r_fullbright = ri.Cvar_Get ("r_fullbright", "0", CVAR_LATCH|CVAR_CHEAT );
	r_mapOverBrightBits = ri.Cvar_Get ("r_mapOverBrightBits", "2", CVAR_LATCH );
	r_intensity = ri.Cvar_Get ("r_intensity", "1", CVAR_LATCH );
	r_singleShader = ri.Cvar_Get ("r_singleShader", "0", CVAR_CHEAT | CVAR_LATCH );

	//
	// archived variables that can change at any time
	//
	r_lodCurveError = ri.Cvar_Get( "r_lodCurveError", "250", CVAR_ARCHIVE|CVAR_CHEAT );
	r_lodbias = ri.Cvar_Get( "r_lodbias", "0", CVAR_ARCHIVE );
	r_flares = ri.Cvar_Get ("r_flares", "0", CVAR_ARCHIVE );
	r_znear = ri.Cvar_Get( "r_znear", "1", CVAR_CHEAT );
	ri.Cvar_CheckRange( r_znear, 0.001f, 200, false );
	r_zproj = ri.Cvar_Get( "r_zproj", "64", CVAR_ARCHIVE );
	r_stereoSeparation = ri.Cvar_Get( "r_stereoSeparation", "64", CVAR_ARCHIVE );
	r_ignoreGLErrors = ri.Cvar_Get( "r_ignoreGLErrors", "1", CVAR_ARCHIVE );
	r_fastsky = ri.Cvar_Get( "r_fastsky", "0", CVAR_ARCHIVE );
	r_inGameVideo = ri.Cvar_Get( "r_inGameVideo", "1", CVAR_ARCHIVE );
	r_drawSun = ri.Cvar_Get( "r_drawSun", "0", CVAR_ARCHIVE );
	r_dynamiclight = ri.Cvar_Get( "r_dynamiclight", "1", CVAR_ARCHIVE );
	r_dlightBacks = ri.Cvar_Get( "r_dlightBacks", "1", CVAR_ARCHIVE );
	r_finish = ri.Cvar_Get ("r_finish", "0", CVAR_ARCHIVE);
	r_textureMode = ri.Cvar_Get( "r_textureMode",
			GENERIC_HW_R_TEXTUREMODE_DEFAULT, CVAR_ARCHIVE );
	r_swapInterval = ri.Cvar_Get( "r_swapInterval", "0",
					CVAR_ARCHIVE | CVAR_LATCH );
	r_gamma = ri.Cvar_Get( "r_gamma", "1", CVAR_ARCHIVE );
	r_facePlaneCull = ri.Cvar_Get ("r_facePlaneCull", "1", CVAR_ARCHIVE );

	r_railWidth = ri.Cvar_Get( "r_railWidth", "16", CVAR_ARCHIVE );
	r_railCoreWidth = ri.Cvar_Get( "r_railCoreWidth", "6", CVAR_ARCHIVE );
	r_railSegmentLength = ri.Cvar_Get( "r_railSegmentLength", "32", CVAR_ARCHIVE );

	r_primitives = ri.Cvar_Get( "r_primitives", "0", CVAR_ARCHIVE );

	r_ambientScale = ri.Cvar_Get( "r_ambientScale", "0.6", CVAR_CHEAT );
	r_directedScale = ri.Cvar_Get( "r_directedScale", "1", CVAR_CHEAT );

	r_anaglyphMode = ri.Cvar_Get("r_anaglyphMode", "0", CVAR_ARCHIVE);

	//
	// temporary variables that can change at any time
	//
	r_showImages = ri.Cvar_Get( "r_showImages", "0", CVAR_CHEAT|CVAR_TEMP );

	r_debugLight = ri.Cvar_Get( "r_debuglight", "0", CVAR_TEMP );
	r_debugSort = ri.Cvar_Get( "r_debugSort", "0", CVAR_CHEAT );
	r_printShaders = ri.Cvar_Get( "r_printShaders", "0", 0 );
	r_saveFontData = ri.Cvar_Get( "r_saveFontData", "0", 0 );

	r_nocurves = ri.Cvar_Get ("r_nocurves", "0", CVAR_CHEAT );
	r_drawworld = ri.Cvar_Get ("r_drawworld", "1", CVAR_CHEAT );
	r_lightmap = ri.Cvar_Get ("r_lightmap", "0", CVAR_CHEAT );
	r_portalOnly = ri.Cvar_Get ("r_portalOnly", "0", CVAR_CHEAT );

	r_flareSize = ri.Cvar_Get ("r_flareSize", "40", CVAR_CHEAT);
	r_flareFade = ri.Cvar_Get ("r_flareFade", "7", CVAR_CHEAT);
	r_flareCoeff = ri.Cvar_Get ("r_flareCoeff", FLARE_STDCOEFF, CVAR_CHEAT);

	r_skipBackEnd = ri.Cvar_Get ("r_skipBackEnd", "0", CVAR_CHEAT);

	r_measureOverdraw = ri.Cvar_Get( "r_measureOverdraw", "0", CVAR_CHEAT );
	r_lodscale = ri.Cvar_Get( "r_lodscale", "5", CVAR_CHEAT );
	r_norefresh = ri.Cvar_Get ("r_norefresh", "0", CVAR_CHEAT);
	r_drawentities = ri.Cvar_Get ("r_drawentities", "1", CVAR_CHEAT );
	r_ignore = ri.Cvar_Get( "r_ignore", "1", CVAR_CHEAT );
	r_nocull = ri.Cvar_Get ("r_nocull", "0", CVAR_CHEAT);
	r_novis = ri.Cvar_Get ("r_novis", "0", CVAR_CHEAT);
	r_showcluster = ri.Cvar_Get ("r_showcluster", "0", CVAR_CHEAT);
	r_speeds = ri.Cvar_Get ("r_speeds", "0", CVAR_CHEAT);
	r_verbose = ri.Cvar_Get( "r_verbose", "0", CVAR_CHEAT );
	r_logFile = ri.Cvar_Get( "r_logFile", "0", CVAR_CHEAT );
	r_debugSurface = ri.Cvar_Get ("r_debugSurface", "0", CVAR_CHEAT);
	r_nobind = ri.Cvar_Get ("r_nobind", "0", CVAR_CHEAT);
	r_showtris = ri.Cvar_Get ("r_showtris", "0", CVAR_CHEAT);
	r_showsky = ri.Cvar_Get ("r_showsky", "0", CVAR_CHEAT);
	r_shownormals = ri.Cvar_Get ("r_shownormals", "0", CVAR_CHEAT);
	r_clear = ri.Cvar_Get ("r_clear", "0", CVAR_CHEAT);
	r_offsetFactor = ri.Cvar_Get( "r_offsetfactor", "-1", CVAR_CHEAT );
	r_offsetUnits = ri.Cvar_Get( "r_offsetunits", "-2", CVAR_CHEAT );
	r_drawBuffer = ri.Cvar_Get( "r_drawBuffer", "GL_BACK", CVAR_CHEAT );
	r_lockpvs = ri.Cvar_Get ("r_lockpvs", "0", CVAR_CHEAT);
	r_noportals = ri.Cvar_Get ("r_noportals", "0", CVAR_CHEAT);
	r_shadows = ri.Cvar_Get( "cg_shadows", "1", 0 );

	r_marksOnTriangleMeshes = ri.Cvar_Get("r_marksOnTriangleMeshes", "0", CVAR_ARCHIVE);

	r_aviMotionJpegQuality = ri.Cvar_Get("r_aviMotionJpegQuality", "90", CVAR_ARCHIVE);
	r_screenshotJpegQuality = ri.Cvar_Get("r_screenshotJpegQuality", "90", CVAR_ARCHIVE);

	r_maxpolys = ri.Cvar_Get( "r_maxpolys", va("%d", MAX_POLYS), 0);
	r_maxpolyverts = ri.Cvar_Get( "r_maxpolyverts", va("%d", MAX_POLYVERTS), 0);

	// make sure all the commands added here are also
	// removed in R_Shutdown
	ri.Cmd_AddCommand( "imagelist", R_ImageList_f );
	ri.Cmd_AddCommand( "shaderlist", R_ShaderList_f );
	ri.Cmd_AddCommand( "skinlist", R_SkinList_f );
	ri.Cmd_AddCommand( "modellist", R_Modellist_f );
	ri.Cmd_AddCommand( "screenshot", R_ScreenShot_f );
	ri.Cmd_AddCommand( "screenshotJPEG", R_ScreenShotJPEG_f );
	ri.Cmd_AddCommand( "gfxinfo", GfxInfo_f );
	ri.Cmd_AddCommand( "minimize", GLimp_Minimize );
}

/*
===============
R_Init
===============
*/
void R_Init( void ) {	
	int	err;
	int i;
	byte *ptr;

	ri.Printf( PRINT_ALL, "----- R_Init -----\n" );

	// clear all our internal state
	Com_Memset( &tr, 0, sizeof( tr ) );
	Com_Memset( &backEnd, 0, sizeof( backEnd ) );
	Com_Memset( &tess, 0, sizeof( tess ) );

//	Swap_Init();

	if ( (intptr_t)tess.xyz & 15 ) {
		ri.Printf( PRINT_WARNING, "tess.xyz not 16 byte aligned\n" );
	}
	Com_Memset( tess.constantColor255, 255, sizeof( tess.constantColor255 ) );

	//
	// init function tables
	//
	for ( i = 0; i < FUNCTABLE_SIZE; i++ )
	{
		tr.sinTable[i]		= sin( DEG2RAD( i * 360.0f / ( ( float ) ( FUNCTABLE_SIZE - 1 ) ) ) );
		tr.squareTable[i]	= ( i < FUNCTABLE_SIZE/2 ) ? 1.0f : -1.0f;
		tr.sawToothTable[i] = (float)i / FUNCTABLE_SIZE;
		tr.inverseSawToothTable[i] = 1.0f - tr.sawToothTable[i];

		if ( i < FUNCTABLE_SIZE / 2 )
		{
			if ( i < FUNCTABLE_SIZE / 4 )
			{
				tr.triangleTable[i] = ( float ) i / ( FUNCTABLE_SIZE / 4 );
			}
			else
			{
				tr.triangleTable[i] = 1.0f - tr.triangleTable[i-FUNCTABLE_SIZE / 4];
			}
		}
		else
		{
			tr.triangleTable[i] = -tr.triangleTable[i-FUNCTABLE_SIZE/2];
		}
	}

	R_InitFogTable();

	R_NoiseInit();

	R_Register();

	max_polys = r_maxpolys->integer;
	if (max_polys < MAX_POLYS)
		max_polys = MAX_POLYS;

	max_polyverts = r_maxpolyverts->integer;
	if (max_polyverts < MAX_POLYVERTS)
		max_polyverts = MAX_POLYVERTS;

	ptr = (byte*)ri.Hunk_Alloc( sizeof( *backEndData ) + sizeof(srfPoly_t) * max_polys + sizeof(polyVert_t) * max_polyverts, h_low);
	backEndData = (backEndData_t *) ptr;
	backEndData->polys = (srfPoly_t *) ((char *) ptr + sizeof( *backEndData ));
	backEndData->polyVerts = (polyVert_t *) ((char *) ptr + sizeof( *backEndData ) + sizeof(srfPoly_t) * max_polys);
	R_InitNextFrame();

	InitOpenGL();

	R_InitImages();

	R_InitShaders();

	R_InitSkins();

	R_ModelInit();

	R_InitFreeType();


	err = qglGetError();
	if ( err != GL_NO_ERROR )
		ri.Printf (PRINT_ALL, "glGetError() = 0x%x\n", err);

	// print info
	GfxInfo_f();
	ri.Printf( PRINT_ALL, "----- finished R_Init -----\n" );
}

/*
===============
RE_Shutdown
===============
*/
void RE_Shutdown( bool destroyWindow ) {	

	ri.Printf( PRINT_ALL, "RE_Shutdown( %i )\n", destroyWindow );

	ri.Cmd_RemoveCommand("gfxinfo");
	ri.Cmd_RemoveCommand("imagelist");
	ri.Cmd_RemoveCommand("modellist");
	ri.Cmd_RemoveCommand("screenshot");
	ri.Cmd_RemoveCommand("screenshotJPEG");
	ri.Cmd_RemoveCommand("shaderlist");
	ri.Cmd_RemoveCommand("skinlist");
	ri.Cmd_RemoveCommand("minimize");

	if ( tr.registered ) {
		R_IssuePendingRenderCommands();
		R_DeleteTextures();
	}

	R_DoneFreeType();

	// shut down platform specific OpenGL stuff
	if ( destroyWindow ) {
		GLimp_Shutdown();

		Com_Memset( &glConfig, 0, sizeof( glConfig ) );
		Com_Memset( &glState, 0, sizeof( glState ) );
	}

	tr.registered = false;
}


/*
=============
RE_EndRegistration

Touch all images to make sure they are resident
=============
*/
void RE_EndRegistration( void ) {
	R_IssuePendingRenderCommands();
	if (!ri.Sys_LowPhysicalMemory()) {
		RB_ShowImages();
	}
}


/*
@@@@@@@@@@@@@@@@@@@@@
GetRefAPI

@@@@@@@@@@@@@@@@@@@@@
*/
#ifdef USE_RENDERER_DLOPEN
extern "C" Q_EXPORT refexport_t* QDECL GetRefAPI ( int apiVersion, refimport_t *rimp ) {
#else
refexport_t *GetRefAPI ( int apiVersion, refimport_t *rimp ) {
#endif

	static refexport_t	re;

	ri = *rimp;

	Com_Memset( &re, 0, sizeof( re ) );

	if ( apiVersion != REF_API_VERSION ) {
		ri.Printf(PRINT_ALL, "Mismatched REF_API_VERSION: expected %i, got %i\n", 
			REF_API_VERSION, apiVersion );
		return NULL;
	}

	// the RE_ functions are Renderer Entry points

	re.Shutdown = RE_Shutdown;

	re.BeginRegistration = RE_BeginRegistration;
	re.RegisterModel = RE_RegisterModel;
	re.RegisterSkin = RE_RegisterSkin;
	re.RegisterShader = RE_RegisterShader;
	re.RegisterShaderNoMip = RE_RegisterShaderNoMip;
	re.LoadWorld = RE_LoadWorldMap;
	re.SetWorldVisData = RE_SetWorldVisData;
	re.EndRegistration = RE_EndRegistration;

	re.BeginFrame = RE_BeginFrame;
	re.EndFrame = RE_EndFrame;

	re.MarkFragments = R_MarkFragments;
	re.LerpTag = R_LerpTag;
	re.ModelBounds = R_ModelBounds;

	re.ClearScene = RE_ClearScene;
	re.AddRefEntityToScene = RE_AddRefEntityToScene;
	re.AddPolyToScene = RE_AddPolyToScene;
	re.LightForPoint = R_LightForPoint;
	re.AddLightToScene = RE_AddLightToScene;
	re.AddAdditiveLightToScene = RE_AddAdditiveLightToScene;
	re.RenderScene = RE_RenderScene;

	re.SetColor = RE_SetColor;
	re.SetClipRegion = RE_SetClipRegion;
	re.DrawStretchPic = RE_StretchPic;
	re.DrawStretchRaw = RE_StretchRaw;
	re.UploadCinematic = RE_UploadCinematic;

	re.RegisterFont = RE_RegisterFont;
	re.RemapShader = R_RemapShader;
	re.GetEntityToken = R_GetEntityToken;
	re.inPVS = R_inPVS;

	re.TakeVideoFrame = RE_TakeVideoFrame;

	return &re;
}