/*
===================
RB_StageIteratorLightmappedMultitexture
===================
*/
void RB_StageIteratorLightmappedMultitexture(void)
{
	shaderCommands_t *input  = &tess;
	shader_t         *shader = input->shader;

	// log this call
	if (r_logFile->integer)
	{
		// don't just call LogComment, or we will get
		// a call to va() every frame!
		GLimp_LogComment(va("--- RB_StageIteratorLightmappedMultitexture( %s ) ---\n", tess.shader->name));
	}

	// set GL fog
	SetIteratorFog();

	// set face culling appropriately
	GL_Cull(shader->cullType);

	// set color, pointers, and lock
	GL_State(GLS_DEFAULT);
	qglVertexPointer(3, GL_FLOAT, 16, input->xyz);

#ifdef REPLACE_MODE
	qglDisableClientState(GL_COLOR_ARRAY);
	qglColor3f(1, 1, 1);
	qglShadeModel(GL_FLAT);
#else
	qglEnableClientState(GL_COLOR_ARRAY);
	qglColorPointer(4, GL_UNSIGNED_BYTE, 0, tess.constantColor255);
#endif

	// select base stage
	GL_SelectTexture(0);

	qglEnableClientState(GL_TEXTURE_COORD_ARRAY);
	R_BindAnimatedImage(&tess.xstages[0]->bundle[0]);
	qglTexCoordPointer(2, GL_FLOAT, 8, tess.texCoords0);

	// configure second stage
	GL_SelectTexture(1);
	qglEnable(GL_TEXTURE_2D);
	if (r_lightmap->integer)
	{
		GL_TexEnv(GL_REPLACE);
	}
	else
	{
		GL_TexEnv(GL_MODULATE);
	}

	// modified for snooper
	if (tess.xstages[0]->bundle[1].isLightmap && (backEnd.refdef.rdflags & RDF_SNOOPERVIEW))
	{
		GL_Bind(tr.whiteImage);
	}
	else
	{
		R_BindAnimatedImage(&tess.xstages[0]->bundle[1]);
	}

	qglEnableClientState(GL_TEXTURE_COORD_ARRAY);
	qglTexCoordPointer(2, GL_FLOAT, 8, tess.texCoords1);

	// lock arrays
	if (qglLockArraysEXT)
	{
		qglLockArraysEXT(0, input->numVertexes);
		GLimp_LogComment("glLockArraysEXT\n");
	}

	R_DrawElements(input->numIndexes, input->indexes);

	// disable texturing on TEXTURE1, then select TEXTURE0
	qglDisable(GL_TEXTURE_2D);
	qglDisableClientState(GL_TEXTURE_COORD_ARRAY);

	GL_SelectTexture(0);
#ifdef REPLACE_MODE
	GL_TexEnv(GL_MODULATE);
	qglShadeModel(GL_SMOOTH);
#endif

	// now do any dynamic lighting needed
	//if ( tess.dlightBits && tess.shader->sort <= SS_OPAQUE )
	if (tess.dlightBits && tess.shader->fogPass &&
	    !(tess.shader->surfaceFlags & (SURF_NODLIGHT | SURF_SKY)))
	{
		if (r_dynamiclight->integer == 2)
		{
			DynamicLightPass();
		}
		else
		{
			DynamicLightSinglePass();
//.........这里部分代码省略.........

/*
** RB_StageIteratorGeneric
*/
void RB_StageIteratorGeneric( void )
{
    shaderCommands_t *input;
    shader_t		*shader;

    input = &tess;
    shader = input->shader;

    RB_DeformTessGeometry();

    //
    // log this call
    //
    if ( r_logFile->integer )
    {
        // don't just call LogComment, or we will get
        // a call to va() every frame!
        GLimp_LogComment( va("--- RB_StageIteratorGeneric( %s ) ---\n", tess.shader->name) );
    }

    //
    // set face culling appropriately
    //
    GL_Cull( shader->cullType );

    // set polygon offset if necessary
    if ( shader->polygonOffset )
    {
        qglEnable( GL_POLYGON_OFFSET_FILL );
        qglPolygonOffset( r_offsetFactor->value, r_offsetUnits->value );
    }

    //
    // if there is only a single pass then we can enable color
    // and texture arrays before we compile, otherwise we need
    // to avoid compiling those arrays since they will change
    // during multipass rendering
    //
    if ( tess.numPasses > 1 || shader->multitextureEnv )
    {
        setArraysOnce = false;
        qglDisableClientState (GL_COLOR_ARRAY);
        qglDisableClientState (GL_TEXTURE_COORD_ARRAY);
    }
    else
    {
        setArraysOnce = true;

        qglEnableClientState( GL_COLOR_ARRAY);
        qglColorPointer( 4, GL_UNSIGNED_BYTE, 0, tess.svars.colors );

        qglEnableClientState( GL_TEXTURE_COORD_ARRAY);
        qglTexCoordPointer( 2, GL_FLOAT, 0, tess.svars.texcoords[0] );
    }

    //
    // lock XYZ
    //
    qglVertexPointer (3, GL_FLOAT, 16, input->xyz);	// padded for SIMD
    if (qglLockArraysEXT)
    {
        qglLockArraysEXT(0, input->numVertexes);
        GLimp_LogComment( "glLockArraysEXT\n" );
    }

    //
    // enable color and texcoord arrays after the lock if necessary
    //
    if ( !setArraysOnce )
    {
        qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
        qglEnableClientState( GL_COLOR_ARRAY );
    }

    //
    // call shader function
    //
    RB_IterateStagesGeneric( input );

    //
    // now do any dynamic lighting needed
    //
    if ( tess.dlightBits && tess.shader->sort <= SS_OPAQUE
            && !(tess.shader->surfaceFlags & (SURF_NODLIGHT | SURF_SKY) ) ) {
        ProjectDlightTexture();
    }

    //
    // now do fog
    //
    if ( tess.fogNum && tess.shader->fogPass ) {
        RB_FogPass();
    }

    //
    // unlock arrays
    //
//.........这里部分代码省略.........

/*
** RB_StageIteratorGeneric
*/
void RB_StageIteratorGeneric( void )
{
	shaderCommands_t *input;
	unsigned int vertexAttribs = 0;

	input = &tess;
	
	if (!input->numVertexes || !input->numIndexes)
	{
		return;
	}

	if (tess.useInternalVBO)
	{
		RB_DeformTessGeometry();
	}

	vertexAttribs = RB_CalcShaderVertexAttribs( input );

	if (tess.useInternalVBO)
	{
		RB_UpdateVBOs(vertexAttribs);
	}
	else
	{
		backEnd.pc.c_staticVboDraws++;
	}

	//
	// log this call
	//
	if ( r_logFile->integer ) 
	{
		// don't just call LogComment, or we will get
		// a call to va() every frame!
		GLimp_LogComment( va("--- RB_StageIteratorGeneric( %s ) ---\n", tess.shader->name) );
	}

	//
	// set face culling appropriately
	//
	if ((backEnd.viewParms.flags & VPF_DEPTHSHADOW))
	{
		//GL_Cull( CT_TWO_SIDED );
		
		if (input->shader->cullType == CT_TWO_SIDED)
			GL_Cull( CT_TWO_SIDED );
		else if (input->shader->cullType == CT_FRONT_SIDED)
			GL_Cull( CT_BACK_SIDED );
		else
			GL_Cull( CT_FRONT_SIDED );
		
	}
	else
		GL_Cull( input->shader->cullType );

	// set polygon offset if necessary
	if ( input->shader->polygonOffset )
	{
		qglEnable( GL_POLYGON_OFFSET_FILL );
		qglPolygonOffset( r_offsetFactor->value, r_offsetUnits->value );
	}

	//
	// Set vertex attribs and pointers
	//
	GLSL_VertexAttribsState(vertexAttribs);

	//
	// render depth if in depthfill mode
	//
	if (backEnd.depthFill)
	{
		RB_IterateStagesGeneric( input );

		//
		// reset polygon offset
		//
		if ( input->shader->polygonOffset )
		{
			qglDisable( GL_POLYGON_OFFSET_FILL );
		}

		return;
	}

	//
	// render shadowmap if in shadowmap mode
	//
	if (backEnd.viewParms.flags & VPF_SHADOWMAP)
	{
		if ( input->shader->sort == SS_OPAQUE )
		{
			RB_RenderShadowmap( input );
		}
		//
		// reset polygon offset
//.........这里部分代码省略.........

//.........这里部分代码省略.........
			planeEq[2] = v1[0]*(v2[1]-v3[1]) + v2[0]*(v3[1]-v1[1]) + v3[0]*(v1[1]-v2[1]);
			planeEq[3] = -( v1[0]*( v2[1]*v3[2] - v3[1]*v2[2] ) +
						v2[0]*(v3[1]*v1[2] - v1[1]*v3[2]) +
						v3[0]*(v1[1]*v2[2] - v2[1]*v1[2]) );

			d = planeEq[0]*lightPos[0]+
				planeEq[1]*lightPos[1]+
				planeEq[2]*lightPos[2]+
				planeEq[3];
		}

		if ( d > 0 ) {
			facing[ i ] = 1;
		} else {
			facing[ i ] = 0;
		}

		// create the edges
		R_AddEdgeDef( i1, i2, facing[ i ] );
		R_AddEdgeDef( i2, i3, facing[ i ] );
		R_AddEdgeDef( i3, i1, facing[ i ] );
	}

	GL_Bind( tr.whiteImage );
	//qglEnable( GL_CULL_FACE );
	GL_State( GLS_SRCBLEND_ONE | GLS_DSTBLEND_ZERO );

#ifndef _DEBUG_STENCIL_SHADOWS
	qglColor3f( 0.2f, 0.2f, 0.2f );

	// don't write to the color buffer
	qglColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );

	qglEnable( GL_STENCIL_TEST );
	qglStencilFunc( GL_ALWAYS, 1, 255 );
#else
	qglColor3f( 1.0f, 0.0f, 0.0f );
	qglPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
	//qglDisable(GL_DEPTH_TEST);
#endif

#ifdef _STENCIL_REVERSE
	qglDepthFunc(GL_LESS);

	//now using the Carmack Reverse<tm> -rww
	if ( backEnd.viewParms.isMirror ) {
		//qglCullFace( GL_BACK );
		GL_Cull(CT_BACK_SIDED);
		qglStencilOp( GL_KEEP, GL_INCR, GL_KEEP );

		R_RenderShadowEdges();

		//qglCullFace( GL_FRONT );
		GL_Cull(CT_FRONT_SIDED);
		qglStencilOp( GL_KEEP, GL_DECR, GL_KEEP );

		R_RenderShadowEdges();
	} else {
		//qglCullFace( GL_FRONT );
		GL_Cull(CT_FRONT_SIDED);
		qglStencilOp( GL_KEEP, GL_INCR, GL_KEEP );

		R_RenderShadowEdges();

		//qglCullFace( GL_BACK );
		GL_Cull(CT_BACK_SIDED);

/*
** RB_StageIteratorGeneric
*/
void RB_StageIteratorGeneric( void ) {
	shaderCommands_t *input;

	input = &tess;

	RB_DeformTessGeometry();

	//
	// log this call
	//
	if ( r_logFile->integer ) {
		// don't just call LogComment, or we will get
		// a call to va() every frame!
		GLimp_LogComment( va( "--- RB_StageIteratorGeneric( %s ) ---\n", tess.shader->name ) );
	}

	// set GL fog
	SetIteratorFog();

	if ( qglPNTrianglesiATI && tess.ATI_tess ) {
		// RF< so we can send the normals as an array
		qglEnableClientState( GL_NORMAL_ARRAY );
#ifdef __MACOS__    //DAJ ATI
		qglPNTrianglesiATI( GL_PN_TRIANGLES_ATI, 1 );
#else
		qglEnable( GL_PN_TRIANGLES_ATI ); // ATI PN-Triangles extension
#endif
	}


	//
	// set face culling appropriately
	//
	GL_Cull( input->shader->cullType );

	// set polygon offset if necessary
	if ( input->shader->polygonOffset ) {
		qglEnable( GL_POLYGON_OFFSET_FILL );
		qglPolygonOffset( r_offsetFactor->value, r_offsetUnits->value );
	}

	//
	// if there is only a single pass then we can enable color
	// and texture arrays before we compile, otherwise we need
	// to avoid compiling those arrays since they will change
	// during multipass rendering
	//
	if ( tess.numPasses > 1 || input->shader->multitextureEnv ) {
		setArraysOnce = qfalse;
		qglDisableClientState( GL_COLOR_ARRAY );
		qglDisableClientState( GL_TEXTURE_COORD_ARRAY );
	} else
	{
		setArraysOnce = qtrue;

		qglEnableClientState( GL_COLOR_ARRAY );
		qglColorPointer( 4, GL_UNSIGNED_BYTE, 0, tess.svars.colors );

		qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
		qglTexCoordPointer( 2, GL_FLOAT, 0, tess.svars.texcoords[0] );
	}

	// RF, send normals only if required
	// This must be done first, since we can't change the arrays once they have been
	// locked
	if ( qglPNTrianglesiATI && tess.ATI_tess ) {
		qglNormalPointer( GL_FLOAT, 16, input->normal );
	}

	//
	// lock XYZ
	//
	qglVertexPointer( 3, GL_FLOAT, 16, input->xyz ); // padded for SIMD
	if ( qglLockArraysEXT ) {
		qglLockArraysEXT( 0, input->numVertexes );
		GLimp_LogComment( "glLockArraysEXT\n" );
	}

	//
	// enable color and texcoord arrays after the lock if necessary
	//
	if ( !setArraysOnce ) {
		qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
		qglEnableClientState( GL_COLOR_ARRAY );
	}

	//
	// call shader function
	//
	RB_IterateStagesGeneric( input );

	//
	// now do any dynamic lighting needed
	//
	if ( tess.dlightBits && tess.shader->sort <= SS_OPAQUE
		 && !( tess.shader->surfaceFlags & ( SURF_NODLIGHT | SURF_SKY ) ) ) {
		ProjectDlightTexture();
//.........这里部分代码省略.........

void R_BloomBlend ( refdef_t *fd )
{
    if( !(fd->rdflags & RDF_BLOOM) || !r_bloom->value || r_showtris->value )
        return;

    if( !BLOOM_SIZE )
        R_Bloom_InitTextures();

    if( screen_texture_width < BLOOM_SIZE ||
            screen_texture_height < BLOOM_SIZE )
        return;

    //set up full screen workspace
    qglViewport ( 0, 0, vid.width, vid.height );
    GL_TexEnv (GL_REPLACE); // Knightmare added
    GL_Disable (GL_DEPTH_TEST);
    qglMatrixMode (GL_PROJECTION);
    qglLoadIdentity ();
    qglOrtho(0, vid.width, vid.height, 0, -10, 100);
    qglMatrixMode (GL_MODELVIEW);
    qglLoadIdentity ();
    GL_Disable (GL_CULL_FACE);

    GL_Disable (GL_BLEND);
    qglEnable (GL_TEXTURE_2D);

    qglColor4f (1, 1, 1, 1);

    //set up current sizes
    curView_x = fd->x;
    curView_y = fd->y;
    curView_width = fd->width;
    curView_height = fd->height;
    screenText_tcw = ((float)fd->width / (float)screen_texture_width);
    screenText_tch = ((float)fd->height / (float)screen_texture_height);
    if( fd->height > fd->width ) {
        sampleText_tcw = ((float)fd->width / (float)fd->height);
        sampleText_tch = 1.0f;
    } else {
        sampleText_tcw = 1.0f;
        sampleText_tch = ((float)fd->height / (float)fd->width);
    }
    sample_width = BLOOM_SIZE * sampleText_tcw;
    sample_height = BLOOM_SIZE * sampleText_tch;

    //copy the screen space we'll use to work into the backup texture
    GL_Bind(r_bloombackuptexture->texnum);
    qglCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, r_screenbackuptexture_size * sampleText_tcw, r_screenbackuptexture_size * sampleText_tch);

    //create the bloom image
    R_Bloom_DownsampleView();
    R_Bloom_GeneratexDiamonds( fd );
    //R_Bloom_GeneratexCross();

    //restore the screen-backup to the screen
    GL_Disable(GL_BLEND);
    GL_Bind(r_bloombackuptexture->texnum);
    qglColor4f( 1, 1, 1, 1 );
    R_Bloom_Quad( 0,
                  vid.height - (r_screenbackuptexture_size * sampleText_tch),
                  r_screenbackuptexture_size * sampleText_tcw,
                  r_screenbackuptexture_size * sampleText_tch,
                  sampleText_tcw,
                  sampleText_tch );

    R_Bloom_DrawEffect( fd );

    // Knightmare added
    R_SetupGL ();
    GL_BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    qglEnable (GL_TEXTURE_2D);
    qglColor4f(1,1,1,1);
}

// If running in stereo, RE_BeginFrame will be called twice for each RE_EndFrame
void RE_BeginFrame( stereoFrame_t stereoFrame ) {
	drawBufferCommand_t	*cmd = NULL;
	colorMaskCommand_t *colcmd = NULL;

	if ( !tr.registered ) {
		return;
	}
	glState.finishCalled = qfalse;

	tr.frameCount++;
	tr.frameSceneNum = 0;

	//
	// do overdraw measurement
	//
	if ( r_measureOverdraw->integer )
	{
		if ( glConfig.stencilBits < 4 )
		{
			ri->Printf( PRINT_ALL, "Warning: not enough stencil bits to measure overdraw: %d\n", glConfig.stencilBits );
			ri->Cvar_Set( "r_measureOverdraw", "0" );
			r_measureOverdraw->modified = qfalse;
		}
		else if ( r_shadows->integer == 2 )
		{
			ri->Printf( PRINT_ALL, "Warning: stencil shadows and overdraw measurement are mutually exclusive\n" );
			ri->Cvar_Set( "r_measureOverdraw", "0" );
			r_measureOverdraw->modified = qfalse;
		}
		else
		{
			R_SyncRenderThread();
			qglEnable( GL_STENCIL_TEST );
			qglStencilMask( ~0U );
			qglClearStencil( 0U );
			qglStencilFunc( GL_ALWAYS, 0U, ~0U );
			qglStencilOp( GL_KEEP, GL_INCR, GL_INCR );
		}
		r_measureOverdraw->modified = qfalse;
	}
	else
	{
		// this is only reached if it was on and is now off
		if ( r_measureOverdraw->modified ) {
			R_SyncRenderThread();
			qglDisable( GL_STENCIL_TEST );
		}
		r_measureOverdraw->modified = qfalse;
	}

	//
	// texturemode stuff
	//
	if ( r_textureMode->modified ) {
		R_SyncRenderThread();
		GL_TextureMode( r_textureMode->string );
		r_textureMode->modified = qfalse;
	}

	//
	// gamma stuff
	//
	if ( r_gamma->modified ) {
		r_gamma->modified = qfalse;

		R_SyncRenderThread();
		R_SetColorMappings();
	}

	// check for errors
	if ( !r_ignoreGLErrors->integer )
	{
		int	err;

		R_SyncRenderThread();
		if ((err = qglGetError()) != GL_NO_ERROR)
			ri->Error(ERR_FATAL, "RE_BeginFrame() - glGetError() failed (0x%x)!", err);
	}

	if (glConfig.stereoEnabled) {
		if( !(cmd = R_GetCommandBuffer(sizeof(*cmd))) )
			return;
			
		cmd->commandId = RC_DRAW_BUFFER;
		
		if ( stereoFrame == STEREO_LEFT ) {
			cmd->buffer = (int)GL_BACK_LEFT;
		} else if ( stereoFrame == STEREO_RIGHT ) {
			cmd->buffer = (int)GL_BACK_RIGHT;
		} else {
			ri->Error( ERR_FATAL, "RE_BeginFrame: Stereo is enabled, but stereoFrame was %i", stereoFrame );
		}
	}
	else
	{
		if(r_anaglyphMode->integer)
		{
			if(r_anaglyphMode->modified)
			{
//.........这里部分代码省略.........

// Renders the input text at the current location with the current color.
// The X position of the current location is used to place the left edge of the text image,
// where the text image bounds are defined as the logical extents of the line of text.
// The Y position of the current location is used to place the bottom of the text image.
// You should offset the Y position by the amount returned by gtk_glwidget_font_descent()
// if you want to place the baseline of the text image at the current Y position.
// Note: A problem with this function is that if the lower left corner of the text falls
// just a hair outside of the viewport (meaning the current raster position is invalid),
// then no text will be rendered.  The solution to this is a very hacky one.  You can search
// Google for "glDrawPixels clipping".
void gtk_glwidget_print_string( const char *s ){
	// The idea for this code initially came from the font-pangoft2.c example that comes with GtkGLExt.

	PangoLayout *layout;
	PangoRectangle log_rect;
	FT_Bitmap bitmap;
	unsigned char *begin_bitmap_buffer;
	GLfloat color[4];
	GLint previous_unpack_alignment;
	GLboolean previous_blend_enabled;
	GLint previous_blend_func_src;
	GLint previous_blend_func_dst;
	GLfloat previous_red_bias;
	GLfloat previous_green_bias;
	GLfloat previous_blue_bias;
	GLfloat previous_alpha_scale;

	if ( !_debug_font_created ) {
		Error( "Programming error: gtk_glwidget_print_string() called but font does not exist; "
			   "you should have called gtk_glwidget_create_font() first" );
	}

	layout = pango_layout_new( ft2_context );
	pango_layout_set_width( layout, -1 ); // -1 no wrapping.  All text on one line.
	pango_layout_set_text( layout, s, -1 ); // -1 null-terminated string.
	pango_layout_get_extents( layout, NULL, &log_rect );

	if ( log_rect.width > 0 && log_rect.height > 0 ) {
		bitmap.rows = font_ascent + font_descent;
		bitmap.width = PANGO_PIXELS_CEIL( log_rect.width );
		bitmap.pitch = -bitmap.width; // Rendering it "upside down" for OpenGL.
		begin_bitmap_buffer = (unsigned char *) g_malloc( bitmap.rows * bitmap.width );
		memset( begin_bitmap_buffer, 0, bitmap.rows * bitmap.width );
		bitmap.buffer = begin_bitmap_buffer + ( bitmap.rows - 1 ) * bitmap.width; // See pitch above.
		bitmap.num_grays = 0xff;
		bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;
		pango_ft2_render_layout_subpixel( &bitmap, layout, -log_rect.x,
										  y_offset_bitmap_render_pango_units );
		qglGetFloatv( GL_CURRENT_COLOR, color );

		// Save state.  I didn't see any OpenGL push/pop operations for these.
		// Question: Is saving/restoring this state necessary?  Being safe.
		qglGetIntegerv( GL_UNPACK_ALIGNMENT, &previous_unpack_alignment );
		previous_blend_enabled = qglIsEnabled( GL_BLEND );
		qglGetIntegerv( GL_BLEND_SRC, &previous_blend_func_src );
		qglGetIntegerv( GL_BLEND_DST, &previous_blend_func_dst );
		qglGetFloatv( GL_RED_BIAS, &previous_red_bias );
		qglGetFloatv( GL_GREEN_BIAS, &previous_green_bias );
		qglGetFloatv( GL_BLUE_BIAS, &previous_blue_bias );
		qglGetFloatv( GL_ALPHA_SCALE, &previous_alpha_scale );

		qglPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
		qglEnable( GL_BLEND );
		qglBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
		qglPixelTransferf( GL_RED_BIAS, color[0] );
		qglPixelTransferf( GL_GREEN_BIAS, color[1] );
		qglPixelTransferf( GL_BLUE_BIAS, color[2] );
		qglPixelTransferf( GL_ALPHA_SCALE, color[3] );

		qglDrawPixels( bitmap.width, bitmap.rows,
					   GL_ALPHA, GL_UNSIGNED_BYTE, begin_bitmap_buffer );
		g_free( begin_bitmap_buffer );

		// Restore state in reverse order of how we set it.
		qglPixelTransferf( GL_ALPHA_SCALE, previous_alpha_scale );
		qglPixelTransferf( GL_BLUE_BIAS, previous_blue_bias );
		qglPixelTransferf( GL_GREEN_BIAS, previous_green_bias );
		qglPixelTransferf( GL_RED_BIAS, previous_red_bias );
		qglBlendFunc( previous_blend_func_src, previous_blend_func_dst );
		if ( !previous_blend_enabled ) {
			qglDisable( GL_BLEND );
		}
		qglPixelStorei( GL_UNPACK_ALIGNMENT, previous_unpack_alignment );
	}

	g_object_unref( G_OBJECT( layout ) );
}

/*********
SP_DrawTexture
*********/
void SP_DrawTexture(void* pixels, float width, float height, float vShift)
{
	if (!pixels)
	{
		// Ug.  We were not even able to load the error message texture.
		return;
	}
	
	// Create a texture from the buffered file
	GLuint texid;
	qglGenTextures(1, &texid);
	qglBindTexture(GL_TEXTURE_2D, texid);
	qglTexImage2D(GL_TEXTURE_2D, 0, GL_DDS1_EXT, width, height, 0, GL_DDS1_EXT, GL_UNSIGNED_BYTE, pixels);

	qglTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
	qglTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
	qglTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
	qglTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );

	// Reset every GL state we've got.  Who knows what state
	// the renderer could be in when this function gets called.
	qglColor3f(1.f, 1.f, 1.f);
#ifdef _XBOX
	if(glw_state->isWidescreen)
		qglViewport(0, 0, 720, 480);
	else
#endif
	qglViewport(0, 0, 640, 480);

	GLboolean alpha = qglIsEnabled(GL_ALPHA_TEST);
	qglDisable(GL_ALPHA_TEST);

	GLboolean blend = qglIsEnabled(GL_BLEND);
	qglDisable(GL_BLEND);

	GLboolean cull = qglIsEnabled(GL_CULL_FACE);
	qglDisable(GL_CULL_FACE);

	GLboolean depth = qglIsEnabled(GL_DEPTH_TEST);
	qglDisable(GL_DEPTH_TEST);

	GLboolean fog = qglIsEnabled(GL_FOG);
	qglDisable(GL_FOG);

	GLboolean lighting = qglIsEnabled(GL_LIGHTING);
	qglDisable(GL_LIGHTING);

	GLboolean offset = qglIsEnabled(GL_POLYGON_OFFSET_FILL);
	qglDisable(GL_POLYGON_OFFSET_FILL);

	GLboolean scissor = qglIsEnabled(GL_SCISSOR_TEST);
	qglDisable(GL_SCISSOR_TEST);

	GLboolean stencil = qglIsEnabled(GL_STENCIL_TEST);
	qglDisable(GL_STENCIL_TEST);

	GLboolean texture = qglIsEnabled(GL_TEXTURE_2D);
	qglEnable(GL_TEXTURE_2D);

	qglMatrixMode(GL_MODELVIEW);
	qglLoadIdentity();
	qglMatrixMode(GL_PROJECTION);
	qglLoadIdentity();
#ifdef _XBOX
	if(glw_state->isWidescreen)
        qglOrtho(0, 720, 0, 480, 0, 1);
	else
#endif
	qglOrtho(0, 640, 0, 480, 0, 1);
	
	qglMatrixMode(GL_TEXTURE0);
	qglLoadIdentity();
	qglMatrixMode(GL_TEXTURE1);
	qglLoadIdentity();

	qglActiveTextureARB(GL_TEXTURE0_ARB);
	qglClientActiveTextureARB(GL_TEXTURE0_ARB);

	memset(&tess, 0, sizeof(tess));

	// Draw the error message
	qglBeginFrame();

	if (!SP_LicenseDone)
	{
		// clear the screen if we haven't done the
		// license yet...
		qglClearColor(0, 0, 0, 1);
		qglClear(GL_COLOR_BUFFER_BIT);
	}

	float x1, x2, y1, y2;
#ifdef _XBOX
	if(glw_state->isWidescreen)
	{
		x1 = 0;
		x2 = 720;
//.........这里部分代码省略.........

void CWind::Render(CWorldEffectsSystem *system)
{
	vec3_t	output;

	if (!mEnabled || !debugShowWind)
	{
		return;
	}

	qglDisable(GL_TEXTURE_2D);
	qglDisable(GL_CULL_FACE);
	GL_State(GLS_ALPHA);

	qglColor4f(1.0, 0.0, 0.0, 0.5);
	qglBegin(GL_QUADS);
	
	VectorMA(mPoint, -(mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[1]/2.0), mPlanes[1], output);
	VectorMA(output, -(mSize[2]/2.0), mPlanes[2], output);
	qglVertex3fv(output);

	VectorMA(mPoint, -(mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, (mSize[1]/2.0), mPlanes[1], output);
	VectorMA(output, -(mSize[2]/2.0), mPlanes[2], output);
	qglVertex3fv(output);

	VectorMA(mPoint, -(mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, (mSize[1]/2.0), mPlanes[1], output);
	VectorMA(output, (mSize[2]/2.0), mPlanes[2], output);
	qglVertex3fv(output);

	VectorMA(mPoint, -(mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[1]/2.0), mPlanes[1], output);
	VectorMA(output, (mSize[2]/2.0), mPlanes[2], output);
	qglVertex3fv(output);

	
	
	qglColor4f(0.0, 1.0, 0.0, 0.5);
	VectorMA(mPoint, -(mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[1]/2.0), mPlanes[1], output);
	VectorMA(output, -(mSize[2]/2.0), mPlanes[2], output);
	qglVertex3fv(output);

	VectorMA(mPoint, (mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[1]/2.0), mPlanes[1], output);
	VectorMA(output, -(mSize[2]/2.0), mPlanes[2], output);
	qglVertex3fv(output);

	VectorMA(mPoint, (mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[1]/2.0), mPlanes[1], output);
	VectorMA(output, (mSize[2]/2.0), mPlanes[2], output);
	qglVertex3fv(output);

	VectorMA(mPoint, -(mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[1]/2.0), mPlanes[1], output);
	VectorMA(output, (mSize[2]/2.0), mPlanes[2], output);
	qglVertex3fv(output);
	

	qglColor4f(0.0, 0.0, 1.0, 0.5);
	VectorMA(mPoint, -(mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[2]/2.0), mPlanes[2], output);
	VectorMA(output, -(mSize[1]/2.0), mPlanes[1], output);
	qglVertex3fv(output);

	VectorMA(mPoint, (mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[2]/2.0), mPlanes[2], output);
	VectorMA(output, -(mSize[1]/2.0), mPlanes[1], output);
	qglVertex3fv(output);

	VectorMA(mPoint, (mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[2]/2.0), mPlanes[2], output);
	VectorMA(output, (mSize[1]/2.0), mPlanes[1], output);
	qglVertex3fv(output);

	VectorMA(mPoint, -(mSize[0]/2.0), mPlanes[0], output);
	VectorMA(output, -(mSize[2]/2.0), mPlanes[2], output);
	VectorMA(output, (mSize[1]/2.0), mPlanes[1], output);
	qglVertex3fv(output);
	
	
	qglEnd();

	qglEnable(GL_CULL_FACE);
	qglEnable(GL_TEXTURE_2D);
}

void CRainSystem::Render(void)
{
	int			i;
	SParticle	*item;
	vec4_t		forward, down, left;
	vec3_t		pos;
//	float		percent;
	float		radius;

	CWorldEffectsSystem::Render();

	if (mFadeAlpha <= 0.0)
	{
		return;
	}

	VectorScale(backEnd.viewParms.or.axis[0], 1, forward);		// forward
	VectorScale(backEnd.viewParms.or.axis[1], 0.2f, left);		// left
	down[0] = 0 - mWindDirection[0] * mRainHeight * mWindAngle;
	down[1] = 0 - mWindDirection[1] * mRainHeight * mWindAngle;
	down[2] = -mRainHeight;

	GL_Bind(mImage);

	GL_State(GLS_ALPHA);
	qglEnable(GL_TEXTURE_2D);
	qglDisable(GL_CULL_FACE);

	qglMatrixMode(GL_MODELVIEW);
	qglPushMatrix();
    qglTranslatef (backEnd.viewParms.or.origin[0], backEnd.viewParms.or.origin[1],  backEnd.viewParms.or.origin[2]);

	item = mRainList;
	qglBegin(GL_TRIANGLES );
	for(i=mMaxRain;i;i--)
	{
/*		percent = (item->pos[1] -(-20.0)) / (20.0 - (-20.0));
		percent *= forward[2];
		if (percent < 0.0)
		{
			radius = 10 * (percent + 1.0);
		}
		else
		{
			radius = 10 * (1.0 - percent);
		}*/
		radius = item->pos[1];
		if (item->pos[2] < 0.0)
		{
//			radius *= 1.0 - (item->pos[2] / 40.0);
			float alpha = mAlpha * (item->pos[1] / -item->pos[2]);

			if (alpha > mAlpha)
			{
				alpha = mAlpha;
			}
			qglColor4f(1.0, 1.0, 1.0, alpha * mFadeAlpha);
		}
		else
		{
			qglColor4f(1.0, 1.0, 1.0, mAlpha * mFadeAlpha);
//			radius *= 1.0 + (item->pos[2] / 20.0);
		}

		pos[0] = sin(item->pos[0]) * radius + (item->pos[2] * mWindDirection[0] * mWindAngle);
		pos[1] = cos(item->pos[0]) * radius + (item->pos[2] * mWindDirection[1] * mWindAngle);
		pos[2] = item->pos[2];

		qglTexCoord2f(1.0, 0.0);
		qglVertex3f(pos[0],
					pos[1],
					pos[2]);

		qglTexCoord2f(0.0, 0.0);
		qglVertex3f(pos[0] + left[0],
					pos[1] + left[1],
					pos[2] + left[2]);
		
		qglTexCoord2f(0.0, 1.0);
		qglVertex3f(pos[0] + down[0] + left[0],
					pos[1] + down[1] + left[1],
					pos[2] + down[2] + left[2]);
		item++;
	}
	qglEnd();

	qglEnable(GL_CULL_FACE);

	qglPopMatrix();
}

/*
================
DrawTris

Draws triangle outlines for debugging
================
*/
static void DrawTris(shaderCommands_t *input)
{
	char         *s        = r_trisColor->string;
	vec4_t       trisColor = { 1, 1, 1, 1 };
	unsigned int stateBits = 0;

	GL_Bind(tr.whiteImage);

	if (*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))
	{
		s += 2;
		if (Q_IsHexColorString(s))
		{
			trisColor[0] = ((float)(gethex(*(s)) * 16 + gethex(*(s + 1)))) / 255.00;
			trisColor[1] = ((float)(gethex(*(s + 2)) * 16 + gethex(*(s + 3)))) / 255.00;
			trisColor[2] = ((float)(gethex(*(s + 4)) * 16 + gethex(*(s + 5)))) / 255.00;

			if (Q_HexColorStringHasAlpha(s))
			{
				trisColor[3] = ((float)(gethex(*(s + 6)) * 16 + gethex(*(s + 7)))) / 255.00;
			}
		}
	}
	else
	{
		int  i;
		char *token;

		for (i = 0 ; i < 4 ; i++)
		{
			token = COM_Parse(&s);
			if (token)
			{
				trisColor[i] = atof(token);
			}
			else
			{
				trisColor[i] = 1.f;
			}
		}

		if (!trisColor[3])
		{
			trisColor[3] = 1.f;
		}
	}

	if (trisColor[3] < 1.f)
	{
		stateBits |= (GLS_SRCBLEND_SRC_ALPHA | GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA);
	}

	qglColor4fv(trisColor);

	if (r_showtris->integer == 2)
	{
		stateBits |= (GLS_POLYMODE_LINE | GLS_DEPTHMASK_TRUE);
		GL_State(stateBits);
		qglDepthRange(0, 0);
	}
#ifdef CELSHADING_HACK
	else if (r_showtris->integer == 3)
	{
		stateBits |= (GLS_POLYMODE_LINE | GLS_DEPTHMASK_TRUE);
		GL_State(stateBits);
		qglEnable(GL_POLYGON_OFFSET_LINE);
		qglPolygonOffset(4.0, 0.5);
		qglLineWidth(5.0);
	}
#endif
	else
	{
		stateBits |= (GLS_POLYMODE_LINE);
		GL_State(stateBits);
		qglEnable(GL_POLYGON_OFFSET_LINE);
		qglPolygonOffset(r_offsetFactor->value, r_offsetUnits->value);
	}

	qglDisableClientState(GL_COLOR_ARRAY);
	qglDisableClientState(GL_TEXTURE_COORD_ARRAY);

	qglVertexPointer(3, GL_FLOAT, 16, input->xyz);   // padded for SIMD

	if (qglLockArraysEXT)
	{
		qglLockArraysEXT(0, input->numVertexes);
		GLimp_LogComment("glLockArraysEXT\n");
	}

	R_DrawElements(input->numIndexes, input->indexes);

	if (qglUnlockArraysEXT)
	{
//.........这里部分代码省略.........

/*
================
rvGEWorkspace::Render

Renders the workspace to the given DC
================
*/
void rvGEWorkspace::Render ( HDC hdc )
{
	int		front;
	int		back;
	float	scale;

	scale = g_ZoomScales[mZoom];

	// Switch GL contexts to our dc
	if (!qwglMakeCurrent( hdc, win32.hGLRC ))
	{
		common->Printf("ERROR: wglMakeCurrent failed.. Error:%i\n", qglGetError());
		common->Printf("Please restart Q3Radiant if the Map view is not working\n");
		return;
	}

	// Prepare the view and clear it
	GL_State( GLS_DEFAULT );
	qglViewport(0, 0, mWindowWidth, mWindowHeight );
	qglScissor(0, 0, mWindowWidth, mWindowHeight );
	qglClearColor ( 0.75f, 0.75f, 0.75f, 0 );

	qglDisable(GL_DEPTH_TEST);
	qglDisable(GL_CULL_FACE);
	qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	// Render the workspace below
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	qglOrtho(0,mWindowWidth, mWindowHeight, 0, -1, 1);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	qglColor3f ( mApplication->GetOptions().GetWorkspaceColor()[0], mApplication->GetOptions().GetWorkspaceColor()[1], mApplication->GetOptions().GetWorkspaceColor()[2] );
	qglBegin ( GL_QUADS );
	qglVertex2f ( mRect.x, mRect.y );
	qglVertex2f ( mRect.x + mRect.w, mRect.y );
	qglVertex2f ( mRect.x + mRect.w, mRect.y + mRect.h );
	qglVertex2f ( mRect.x, mRect.y + mRect.h );
	qglEnd ( );

	// Prepare the renderSystem view to draw the GUI in
	viewDef_t viewDef;
	memset ( &viewDef, 0, sizeof(viewDef) );
	tr.viewDef = &viewDef;
	tr.viewDef->renderView.x = mRect.x;
	tr.viewDef->renderView.y = mWindowHeight - mRect.y - mRect.h;
	tr.viewDef->renderView.width = mRect.w;
	tr.viewDef->renderView.height = mRect.h;
	tr.viewDef->scissor.x1 = 0;
	tr.viewDef->scissor.y1 = 0;
	tr.viewDef->scissor.x2 = mRect.w;
	tr.viewDef->scissor.y2 = mRect.h;
	tr.viewDef->isEditor = true;
	renderSystem->BeginFrame(mWindowWidth, mWindowHeight );

	// Draw the gui
	mInterface->Redraw ( 0 ); // eventLoop->Milliseconds() );

	// We are done using the renderSystem now
	renderSystem->EndFrame( &front, &back );

	if ( mApplication->GetActiveWorkspace ( ) == this )
	{
		mApplication->GetStatusBar().SetTriangles ( backEnd.pc.c_drawIndexes/3 );
	}

	// Prepare the viewport for drawing selections, etc.
	GL_State( GLS_DEFAULT );
	qglDisable( GL_TEXTURE_CUBE_MAP_EXT );
//	qglDisable(GL_BLEND);
	qglDisable(GL_CULL_FACE);

	qglViewport(0, 0, mWindowWidth, mWindowHeight );
	qglScissor(0, 0, mWindowWidth, mWindowHeight );
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	qglOrtho(0,mWindowWidth, mWindowHeight, 0, -1, 1);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	RenderGrid ( );

	mSelections.Render ( );

	qglFinish ( );
	qwglSwapBuffers(hdc);

	qglEnable( GL_TEXTURE_CUBE_MAP_EXT );
	qglEnable( GL_CULL_FACE);
}

/*
=============
R_CheckCvars

See if some cvars that we watch have changed
=============
*/
static void R_CheckCvars()
{

	// gamma stuff
	if( r_gamma.IsModified() || r_brightness.IsModified() )
	{
		r_gamma.ClearModified();
		r_brightness.ClearModified();
		R_SetColorMappings();
	}
	
	// filtering
	if( r_maxAnisotropicFiltering.IsModified() || r_useTrilinearFiltering.IsModified() || r_lodBias.IsModified() )
	{
		idLib::Printf( "Updating texture filter parameters.\n" );
		r_maxAnisotropicFiltering.ClearModified();
		r_useTrilinearFiltering.ClearModified();
		r_lodBias.ClearModified();
		for( int i = 0 ; i < globalImages->images.Num() ; i++ )
		{
			if( globalImages->images[i] )
			{
				globalImages->images[i]->Bind();
				globalImages->images[i]->SetTexParameters();
			}
		}
	}
	
	extern idCVar r_useSeamlessCubeMap;
	if( r_useSeamlessCubeMap.IsModified() )
	{
		r_useSeamlessCubeMap.ClearModified();
		if( glConfig.seamlessCubeMapAvailable )
		{
			if( r_useSeamlessCubeMap.GetBool() )
			{
				qglEnable( GL_TEXTURE_CUBE_MAP_SEAMLESS );
			}
			else
			{
				qglDisable( GL_TEXTURE_CUBE_MAP_SEAMLESS );
			}
		}
	}
	
	extern idCVar r_useSRGB;
	if( r_useSRGB.IsModified() )
	{
		r_useSRGB.ClearModified();
		if( glConfig.sRGBFramebufferAvailable )
		{
			if( r_useSRGB.GetBool() )
			{
				qglEnable( GL_FRAMEBUFFER_SRGB );
			}
			else
			{
				qglDisable( GL_FRAMEBUFFER_SRGB );
			}
		}
	}
	
	
	if( r_multiSamples.IsModified() )
	{
		if( r_multiSamples.GetInteger() > 0 )
		{
			qglEnable( GL_MULTISAMPLE_ARB );
		}
		else
		{
			qglDisable( GL_MULTISAMPLE_ARB );
		}
	}
	
	// check for changes to logging state
	GLimp_EnableLogging( r_logFile.GetInteger() != 0 );
}

/*
=================
RB_ShadowTessEnd

triangleFromEdge[ v1 ][ v2 ]


  set triangle from edge( v1, v2, tri )
  if ( facing[ triangleFromEdge[ v1 ][ v2 ] ] && !facing[ triangleFromEdge[ v2 ][ v1 ] ) {
  }
=================
*/
void RB_ShadowTessEnd( void ) {
	int		i;
	int		numTris;
	vec3_t	lightDir;
	GLboolean rgba[4];

	// we can only do this if we have enough space in the vertex buffers
	if ( tess.numVertexes >= SHADER_MAX_VERTEXES / 2 ) {
		return;
	}

	if ( glConfig.stencilBits < 4 ) {
		return;
	}

	VectorCopy( backEnd.currentEntity->lightDir, lightDir );

	// project vertexes away from light direction
	for ( i = 0 ; i < tess.numVertexes ; i++ ) {
		VectorMA( tess.xyz[i], -512, lightDir, tess.xyz[i+tess.numVertexes] );
	}

	// decide which triangles face the light
	Com_Memset( numEdgeDefs, 0, 4 * tess.numVertexes );

	numTris = tess.numIndexes / 3;
	for ( i = 0 ; i < numTris ; i++ ) {
		int		i1, i2, i3;
		vec3_t	d1, d2, normal;
		float	*v1, *v2, *v3;
		float	d;

		i1 = tess.indexes[ i*3 + 0 ];
		i2 = tess.indexes[ i*3 + 1 ];
		i3 = tess.indexes[ i*3 + 2 ];

		v1 = tess.xyz[ i1 ];
		v2 = tess.xyz[ i2 ];
		v3 = tess.xyz[ i3 ];

		VectorSubtract( v2, v1, d1 );
		VectorSubtract( v3, v1, d2 );
		CrossProduct( d1, d2, normal );

		d = DotProduct( normal, lightDir );
		if ( d > 0 ) {
			facing[ i ] = 1;
		} else {
			facing[ i ] = 0;
		}

		// create the edges
		R_AddEdgeDef( i1, i2, facing[ i ] );
		R_AddEdgeDef( i2, i3, facing[ i ] );
		R_AddEdgeDef( i3, i1, facing[ i ] );
	}

	// draw the silhouette edges

	GL_Bind( tr.whiteImage );
	qglEnable( GL_CULL_FACE );
	GL_State( GLS_SRCBLEND_ONE | GLS_DSTBLEND_ZERO );
	qglColor3f( 0.2f, 0.2f, 0.2f );

	// don't write to the color buffer
	qglGetBooleanv(GL_COLOR_WRITEMASK, rgba);
	qglColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );

	qglEnable( GL_STENCIL_TEST );
	qglStencilFunc( GL_ALWAYS, 1, 255 );

	// mirrors have the culling order reversed
	if ( backEnd.viewParms.isMirror ) {
		qglCullFace( GL_FRONT );
		qglStencilOp( GL_KEEP, GL_KEEP, GL_INCR );

		R_RenderShadowEdges();

		qglCullFace( GL_BACK );
		qglStencilOp( GL_KEEP, GL_KEEP, GL_DECR );

		R_RenderShadowEdges();
	} else {
		qglCullFace( GL_BACK );
		qglStencilOp( GL_KEEP, GL_KEEP, GL_INCR );

		R_RenderShadowEdges();

//.........这里部分代码省略.........

/*
====================
RE_BeginFrame

If running in stereo, RE_BeginFrame will be called twice
for each RE_EndFrame
====================
*/
void RE_BeginFrame( stereoFrame_t stereoFrame ) {
	drawBufferCommand_t	*cmd;

	if ( !tr.registered ) {
		return;
	}
	glState.finishCalled = qfalse;

	tr.frameCount++;
	tr.frameSceneNum = 0;

	//
	// do overdraw measurement
	//
	if ( r_measureOverdraw->integer )
	{
		if ( glConfig.stencilBits < 4 )
		{
			ri.Printf( PRINT_ALL, "Warning: not enough stencil bits to measure overdraw: %d\n", glConfig.stencilBits );
			ri.Cvar_Set( "r_measureOverdraw", "0" );
			r_measureOverdraw->modified = qfalse;
		}
		else if ( r_shadows->integer == 2 )
		{
			ri.Printf( PRINT_ALL, "Warning: stencil shadows and overdraw measurement are mutually exclusive\n" );
			ri.Cvar_Set( "r_measureOverdraw", "0" );
			r_measureOverdraw->modified = qfalse;
		}
		else
		{
			R_SyncRenderThread();
			qglEnable( GL_STENCIL_TEST );
			qglStencilMask( ~0U );
			qglClearStencil( 0U );
			qglStencilFunc( GL_ALWAYS, 0U, ~0U );
			qglStencilOp( GL_KEEP, GL_INCR, GL_INCR );
		}
		r_measureOverdraw->modified = qfalse;
	}
	else
	{
		// this is only reached if it was on and is now off
		if ( r_measureOverdraw->modified ) {
			R_SyncRenderThread();
			qglDisable( GL_STENCIL_TEST );
			r_measureOverdraw->modified = qfalse;
		}
	}

	//
	// texturemode stuff
	//
	if ( r_textureMode->modified || r_ext_texture_filter_anisotropic->modified) {
		R_SyncRenderThread();
		GL_TextureMode( r_textureMode->string );
		r_textureMode->modified = qfalse;
		r_ext_texture_filter_anisotropic->modified = qfalse;
	}

	//
	// gamma stuff
	//
	if ( r_gamma->modified ) {
		r_gamma->modified = qfalse;

		R_SyncRenderThread();
		R_SetColorMappings();
	}

    // check for errors
    if ( !r_ignoreGLErrors->integer ) {
        int	err;

		R_SyncRenderThread();
        if ( ( err = qglGetError() ) != GL_NO_ERROR ) {
            ri.Error( ERR_FATAL, "RE_BeginFrame() - glGetError() failed (0x%x)!\n", err );
        }
    }

	//
	// draw buffer stuff
	//
	cmd = (drawBufferCommand_t *) R_GetCommandBuffer( sizeof( *cmd ) );
	if ( !cmd ) {
		return;
	}
	cmd->commandId = RC_DRAW_BUFFER;

	if ( glConfig.stereoEnabled ) {
		if ( stereoFrame == STEREO_LEFT ) {
			cmd->buffer = (int)GL_BACK_LEFT;
		} else if ( stereoFrame == STEREO_RIGHT ) {
//.........这里部分代码省略.........

void CCamWnd::Cam_Draw()
{
	brush_t	*brush;
	face_t	*face;
	float	screenaspect;
	float	yfov;
	double	start, end;
	int		i;

	/*
  FILE *f = fopen("g:/nardo/raduffy/editorhack.dat", "w");
  if (f != NULL) {
    fwrite(&m_Camera.origin[0], sizeof(float), 1, f);
    fwrite(&m_Camera.origin[1], sizeof(float), 1, f);
    fwrite(&m_Camera.origin[2], sizeof(float), 1, f);
		fwrite(&m_Camera.angles[PITCH], sizeof(float), 1, f);
		fwrite(&m_Camera.angles[YAW], sizeof(float), 1, f);
    fclose(f);
  }
	*/
	
	if (!active_brushes.next)
		return;	// not valid yet
	
	if (m_Camera.timing)
		start = Sys_DoubleTime ();
	
	//
	// clear
	//
	QE_CheckOpenGLForErrors();
	
	qglViewport(0, 0, m_Camera.width, m_Camera.height);
	qglScissor(0, 0, m_Camera.width, m_Camera.height);
	qglClearColor (g_qeglobals.d_savedinfo.colors[COLOR_CAMERABACK][0],
		g_qeglobals.d_savedinfo.colors[COLOR_CAMERABACK][1],
		g_qeglobals.d_savedinfo.colors[COLOR_CAMERABACK][2], 0);
	qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	//
	// set up viewpoint
	//
	vec5_t lightPos;
	
	if (g_PrefsDlg.m_bGLLighting)
	{
		qglEnable(GL_LIGHTING);
		//qglEnable(GL_LIGHT0);
		
		lightPos[0] = lightPos[1] = lightPos[2] = 3.5;
		lightPos[3] = 1.0;
		qglLightModelfv(GL_LIGHT_MODEL_AMBIENT, lightPos);
		//qglLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);
		//lightPos[0] = lightPos[1] = lightPos[2] = 3.5;
    //qglLightfv(GL_LIGHT0, GL_AMBIENT, lightPos);
	}
	else
	{
		qglDisable(GL_LIG