void Gui_Render()
{
    const text_shader_description *shader = renderer.shaderManager->getTextShader();
    screenSize[0] = screen_info.w;
    screenSize[1] = screen_info.h;
    qglUseProgramObjectARB(shader->program);
    qglUniform1iARB(shader->sampler, 0);
    qglUniform2fvARB(shader->screenSize, 1, screenSize);
    qglUniform1fARB(shader->colorReplace, 0.0f);

    qglPushAttrib(GL_ENABLE_BIT | GL_PIXEL_MODE_BIT | GL_COLOR_BUFFER_BIT);
    qglPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT | GL_CLIENT_VERTEX_ARRAY_BIT);

    qglEnableClientState(GL_TEXTURE_COORD_ARRAY);
    qglPolygonMode(GL_FRONT, GL_FILL);
    qglFrontFace(GL_CCW);
    qglEnable(GL_BLEND);
    qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    qglDisable(GL_ALPHA_TEST);

    if(World_GetPlayer() && main_inventory_manager)
    {
        Gui_DrawInventory(engine_frame_time);
    }
    Gui_DrawNotifier(engine_frame_time);
    qglUseProgramObjectARB(shader->program);

    qglDepthMask(GL_FALSE);

    qglPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
    qglPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    if(screen_info.crosshair != 0)
    {
        Gui_DrawCrosshair();
    }
    Gui_DrawBars();

    qglUniform1fARB(shader->colorReplace, 1.0f);
    GLText_RenderStrings();
    Con_Draw(engine_frame_time);

    qglUniform1fARB(shader->colorReplace, 0.0f);
    qglDepthMask(GL_TRUE);
    qglPopClientAttrib();
    qglPopAttrib();
}

/*
===================
DrawMultitextured

output = t0 * t1 or t0 + t1

t0 = most upstream according to spec
t1 = most downstream according to spec
===================
*/
static void DrawMultitextured( shaderCommands_t *input, int stage ) {
	shaderStage_t	*pStage;

	pStage = tess.xstages[stage];

	GL_State( pStage->stateBits );

	// this is an ugly hack to work around a GeForce driver
	// bug with multitexture and clip planes
	if ( backEnd.viewParms.isPortal ) {
		qglPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
	}

	//
	// base
	//
	GL_SelectTexture( 0 );
	qglTexCoordPointer( 2, GL_FLOAT, 0, input->svars.texcoords[0] );
	R_BindAnimatedImage( &pStage->bundle[0] );

	//
	// lightmap/secondary pass
	//
	GL_SelectTexture( 1 );
	qglEnable( GL_TEXTURE_2D );
	qglEnableClientState( GL_TEXTURE_COORD_ARRAY );

	if ( r_lightmap->integer ) {
		GL_TexEnv( GL_REPLACE );
	} else {
		GL_TexEnv( tess.shader->multitextureEnv );
	}

	qglTexCoordPointer( 2, GL_FLOAT, 0, input->svars.texcoords[1] );

	R_BindAnimatedImage( &pStage->bundle[1] );

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

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

	GL_SelectTexture( 0 );
}

/*
** 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;

#ifdef HAVE_GLES
	glPixelStorei(GL_PACK_ALIGNMENT, 1);
	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
#else
	qglPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
#endif
	qglDepthMask( GL_TRUE );
	qglDisable( GL_DEPTH_TEST );
	qglEnable( GL_SCISSOR_TEST );
	qglDisable( GL_CULL_FACE );
	qglDisable( GL_BLEND );
}

static void DrawSkySideInner(struct image_s *image, const int mins[2], const int maxs[2])
{
	int s, t;

	GL_Bind(image);
	GLfloat vtx[3 * 1024];    // arbitrary sized
	GLfloat tex[2 * 1024];
	int     idx;

	GLboolean text  = qglIsEnabled(GL_TEXTURE_COORD_ARRAY);
	GLboolean glcol = qglIsEnabled(GL_COLOR_ARRAY);
	if (glcol)
	{
		qglDisableClientState(GL_COLOR_ARRAY);
	}
	if (!text)
	{
		qglEnableClientState(GL_TEXTURE_COORD_ARRAY);
	}

	//qglDisable (GL_BLEND);
	qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	qglEnable(GL_BLEND);
	GL_TexEnv(GL_MODULATE);

	for (t = mins[1] + HALF_SKY_SUBDIVISIONS; t < maxs[1] + HALF_SKY_SUBDIVISIONS; t++)
	{
		idx = 0;

		for (s = mins[0] + HALF_SKY_SUBDIVISIONS; s <= maxs[0] + HALF_SKY_SUBDIVISIONS; s++)
		{
			memcpy(tex + idx * 2, s_skyTexCoords[t][s], sizeof(GLfloat) * 2);
			memcpy(vtx + idx * 3, s_skyPoints[t][s], sizeof(GLfloat) * 3);
			idx++;
			memcpy(tex + idx * 2, s_skyTexCoords[t + 1][s], sizeof(GLfloat) * 2);
			memcpy(vtx + idx * 3, s_skyPoints[t + 1][s], sizeof(GLfloat) * 3);
			idx++;
		}

		qglVertexPointer(3, GL_FLOAT, 0, vtx);
		qglTexCoordPointer(2, GL_FLOAT, 0, tex);
		qglDrawArrays(GL_TRIANGLE_STRIP, 0, idx);
	}

	qglDisable(GL_BLEND);
}

/*
=====================
RB_STD_FillDepthBuffer

If we are rendering a subview with a near clip plane, use a second texture
to force the alpha test to fail when behind that clip plane
=====================
*/
void RB_STD_FillDepthBuffer(drawSurf_t **drawSurfs, int numDrawSurfs)
{
	// if we are just doing 2D rendering, no need to fill the depth buffer
	if (!backEnd.viewDef->viewEntitys) {
		return;
	}

	RB_LogComment("---------- RB_STD_FillDepthBuffer ----------\n");

	// enable the second texture for mirror plane clipping if needed
	if (backEnd.viewDef->numClipPlanes) {
		GL_SelectTexture(1);
		globalImages->alphaNotchImage->Bind();
		qglDisableClientState(GL_TEXTURE_COORD_ARRAY);
		qglEnable(GL_TEXTURE_GEN_S);
		qglTexCoord2f(1, 0.5);
	}

	// the first texture will be used for alpha tested surfaces
	GL_SelectTexture(0);
	qglEnableClientState(GL_TEXTURE_COORD_ARRAY);

	// decal surfaces may enable polygon offset
	qglPolygonOffset(r_offsetFactor.GetFloat(), r_offsetUnits.GetFloat());

	GL_State(GLS_DEPTHFUNC_LESS);

	// Enable stencil test if we are going to be using it for shadows.
	// If we didn't do this, it would be legal behavior to get z fighting
	// from the ambient pass and the light passes.
	qglEnable(GL_STENCIL_TEST);
	qglStencilFunc(GL_ALWAYS, 1, 255);

	RB_RenderDrawSurfListWithFunction(drawSurfs, numDrawSurfs, RB_T_FillDepthBuffer);

	if (backEnd.viewDef->numClipPlanes) {
		GL_SelectTexture(1);
		globalImages->BindNull();
		qglDisable(GL_TEXTURE_GEN_S);
		GL_SelectTexture(0);
	}

}

void CQuickSpriteSystem::Flush(void)
{
	if (mNextVert==0)
	{
		return;
	}

	//
	// render the main pass
	//
	R_BindAnimatedImage( mTexBundle );
	GL_State(mGLStateBits);

	//
	// set arrays and lock
	//
	qglTexCoordPointer( 2, GL_FLOAT, 0, mTextureCoords );
	qglEnableClientState( GL_TEXTURE_COORD_ARRAY);

	qglEnableClientState( GL_COLOR_ARRAY);
	qglColorPointer( 4, GL_UNSIGNED_BYTE, 0, mColors );

	qglVertexPointer (3, GL_FLOAT, 16, mVerts);

	if ( qglLockArraysEXT )
	{
		qglLockArraysEXT(0, mNextVert);
		GLimp_LogComment( "glLockArraysEXT\n" );
	}

	qglDrawArrays(GL_QUADS, 0, mNextVert);

	backEnd.pc.c_vertexes += mNextVert;
	backEnd.pc.c_indexes += mNextVert;
	backEnd.pc.c_totalIndexes += mNextVert;

	if (mUseFog)
	{
		//
		// render the fog pass
		//
		GL_Bind( tr.fogImage );
		GL_State( GLS_SRCBLEND_SRC_ALPHA | GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA | GLS_DEPTHFUNC_EQUAL );

		//
		// set arrays and lock
		//
		qglTexCoordPointer( 2, GL_FLOAT, 0, mFogTextureCoords);
//		qglEnableClientState( GL_TEXTURE_COORD_ARRAY);	// Done above

		qglDisableClientState( GL_COLOR_ARRAY );
		qglColor4ubv((GLubyte *)&mFogColor);

//		qglVertexPointer (3, GL_FLOAT, 16, mVerts);	// Done above

		qglDrawArrays(GL_QUADS, 0, mNextVert);

		// Second pass from fog
		backEnd.pc.c_totalIndexes += mNextVert;
	}

	// 
	// unlock arrays
	//
	if (qglUnlockArraysEXT) 
	{
		qglUnlockArraysEXT();
		GLimp_LogComment( "glUnlockArraysEXT\n" );
	}

	mNextVert=0;
}

/*
==================
RB_ARB2_DrawInteractions
==================
*/
void RB_ARB2_DrawInteractions( void ) {
	viewLight_t		*vLight;
	const idMaterial	*lightShader;

	GL_SelectTexture( 0 );
	qglDisableClientState( GL_TEXTURE_COORD_ARRAY );

	//
	// for each light, perform adding and shadowing
	//
	for ( vLight = backEnd.viewDef->viewLights ; vLight ; vLight = vLight->next ) {
		backEnd.vLight = vLight;

		// do fogging later
		if ( vLight->lightShader->IsFogLight() ) {
			continue;
		}
		if ( vLight->lightShader->IsBlendLight() ) {
			continue;
		}

		if ( !vLight->localInteractions && !vLight->globalInteractions
			&& !vLight->translucentInteractions ) {
			continue;
		}

		lightShader = vLight->lightShader;

		// clear the stencil buffer if needed
		if ( vLight->globalShadows || vLight->localShadows ) {
			backEnd.currentScissor = vLight->scissorRect;
			if ( r_useScissor.GetBool() ) {
				qglScissor( backEnd.viewDef->viewport.x1 + backEnd.currentScissor.x1, 
					backEnd.viewDef->viewport.y1 + backEnd.currentScissor.y1,
					backEnd.currentScissor.x2 + 1 - backEnd.currentScissor.x1,
					backEnd.currentScissor.y2 + 1 - backEnd.currentScissor.y1 );
			}
			qglClear( GL_STENCIL_BUFFER_BIT );
		} else {
			// no shadows, so no need to read or write the stencil buffer
			// we might in theory want to use GL_ALWAYS instead of disabling
			// completely, to satisfy the invarience rules
			qglStencilFunc( GL_ALWAYS, 128, 255 );
		}

		if ( r_useShadowVertexProgram.GetBool() ) {
			qglEnable( GL_VERTEX_PROGRAM_ARB );
			qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, VPROG_STENCIL_SHADOW );
			RB_StencilShadowPass( vLight->globalShadows );
			RB_ARB2_CreateDrawInteractions( vLight->localInteractions );
			qglEnable( GL_VERTEX_PROGRAM_ARB );
			qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, VPROG_STENCIL_SHADOW );
			RB_StencilShadowPass( vLight->localShadows );
			RB_ARB2_CreateDrawInteractions( vLight->globalInteractions );
			qglDisable( GL_VERTEX_PROGRAM_ARB );	// if there weren't any globalInteractions, it would have stayed on
		} else {
			RB_StencilShadowPass( vLight->globalShadows );
			RB_ARB2_CreateDrawInteractions( vLight->localInteractions );
			RB_StencilShadowPass( vLight->localShadows );
			RB_ARB2_CreateDrawInteractions( vLight->globalInteractions );
		}

		// translucent surfaces never get stencil shadowed
		if ( r_skipTranslucent.GetBool() ) {
			continue;
		}

		qglStencilFunc( GL_ALWAYS, 128, 255 );

		backEnd.depthFunc = GLS_DEPTHFUNC_LESS;
		RB_ARB2_CreateDrawInteractions( vLight->translucentInteractions );

		backEnd.depthFunc = GLS_DEPTHFUNC_EQUAL;
	}

	// disable stencil shadow test
	qglStencilFunc( GL_ALWAYS, 128, 255 );

	GL_SelectTexture( 0 );
	qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
}

/*
=============
RB_ARB2_CreateDrawInteractions

=============
*/
void RB_ARB2_CreateDrawInteractions( const drawSurf_t *surf ) {
	if ( !surf ) {
		return;
	}

	// perform setup here that will be constant for all interactions
	GL_State( GLS_SRCBLEND_ONE | GLS_DSTBLEND_ONE | GLS_DEPTHMASK | backEnd.depthFunc );

	// bind the vertex program
	if ( r_testARBProgram.GetBool() ) {
		qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, VPROG_TEST );
		qglBindProgramARB( GL_FRAGMENT_PROGRAM_ARB, FPROG_TEST );
	} else {
		qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, VPROG_INTERACTION );
		qglBindProgramARB( GL_FRAGMENT_PROGRAM_ARB, FPROG_INTERACTION );
	}

	qglEnable(GL_VERTEX_PROGRAM_ARB);
	qglEnable(GL_FRAGMENT_PROGRAM_ARB);

	// enable the vertex arrays
	qglEnableVertexAttribArrayARB( 8 );
	qglEnableVertexAttribArrayARB( 9 );
	qglEnableVertexAttribArrayARB( 10 );
	qglEnableVertexAttribArrayARB( 11 );
	qglEnableClientState( GL_COLOR_ARRAY );

	// texture 0 is the normalization cube map for the vector towards the light
	GL_SelectTextureNoClient( 0 );
	if ( backEnd.vLight->lightShader->IsAmbientLight() ) {
		globalImages->ambientNormalMap->Bind();
	} else {
		globalImages->normalCubeMapImage->Bind();
	}

	// texture 6 is the specular lookup table
	GL_SelectTextureNoClient( 6 );
	if ( r_testARBProgram.GetBool() ) {
		globalImages->specular2DTableImage->Bind();	// variable specularity in alpha channel
	} else {
		globalImages->specularTableImage->Bind();
	}


	for ( ; surf ; surf=surf->nextOnLight ) {
		// perform setup here that will not change over multiple interaction passes

		// set the vertex pointers
		idDrawVert	*ac = (idDrawVert *)vertexCache.Position( surf->geo->ambientCache );
		qglColorPointer( 4, GL_UNSIGNED_BYTE, sizeof( idDrawVert ), ac->color );
		qglVertexAttribPointerARB( 11, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );
		qglVertexAttribPointerARB( 10, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->tangents[1].ToFloatPtr() );
		qglVertexAttribPointerARB( 9, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->tangents[0].ToFloatPtr() );
		qglVertexAttribPointerARB( 8, 2, GL_FLOAT, false, sizeof( idDrawVert ), ac->st.ToFloatPtr() );
		qglVertexPointer( 3, GL_FLOAT, sizeof( idDrawVert ), ac->xyz.ToFloatPtr() );

		// this may cause RB_ARB2_DrawInteraction to be exacuted multiple
		// times with different colors and images if the surface or light have multiple layers
		RB_CreateSingleDrawInteractions( surf, RB_ARB2_DrawInteraction );
	}

	qglDisableVertexAttribArrayARB( 8 );
	qglDisableVertexAttribArrayARB( 9 );
	qglDisableVertexAttribArrayARB( 10 );
	qglDisableVertexAttribArrayARB( 11 );
	qglDisableClientState( GL_COLOR_ARRAY );

	// disable features
	GL_SelectTextureNoClient( 6 );
	globalImages->BindNull();

	GL_SelectTextureNoClient( 5 );
	globalImages->BindNull();

	GL_SelectTextureNoClient( 4 );
	globalImages->BindNull();

	GL_SelectTextureNoClient( 3 );
	globalImages->BindNull();

	GL_SelectTextureNoClient( 2 );
	globalImages->BindNull();

	GL_SelectTextureNoClient( 1 );
	globalImages->BindNull();

	backEnd.glState.currenttmu = -1;
	GL_SelectTexture( 0 );

	qglDisable(GL_VERTEX_PROGRAM_ARB);
	qglDisable(GL_FRAGMENT_PROGRAM_ARB);
}

void RB_StageIteratorLightmappedMultitexture( void ) {
	shaderCommands_t *input;
	shader_t		*shader;

	input = &tess;
	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 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, 16, tess.texCoords[0][0] );

	//
	// configure second stage
	//
	GL_SelectTexture( 1 );
	qglEnable( GL_TEXTURE_2D );
	if ( r_lightmap->integer ) {
		GL_TexEnv( GL_REPLACE );
	} else {
		GL_TexEnv( GL_MODULATE );
	}
	R_BindAnimatedImage( &tess.xstages[0]->bundle[1] );
	qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
	qglTexCoordPointer( 2, GL_FLOAT, 16, tess.texCoords[0][1] );

	//
	// 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 ) {
		ProjectDlightTexture();
	}

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

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

//.........这里部分代码省略.........
			floatColor[0] = dl->color[0] * 255.0f;
			floatColor[1] = dl->color[1] * 255.0f;
			floatColor[2] = dl->color[2] * 255.0f;
		}

		for ( i = 0 ; i < tess.numVertexes ; i++, texCoords += 2, colors += 4 ) {
			int		clip = 0;
			vec3_t	dist;
			
			VectorSubtract( origin, tess.xyz[i], dist );

			backEnd.pc.c_dlightVertexes++;

			texCoords[0] = 0.5f + dist[0] * scale;
			texCoords[1] = 0.5f + dist[1] * scale;

			if( !r_dlightBacks->integer &&
					// dist . tess.normal[i]
					( dist[0] * tess.normal[i][0] +
					dist[1] * tess.normal[i][1] +
					dist[2] * tess.normal[i][2] ) < 0.0f ) {
				clip = 63;
			} else {
				if ( texCoords[0] < 0.0f ) {
					clip |= 1;
				} else if ( texCoords[0] > 1.0f ) {
					clip |= 2;
				}
				if ( texCoords[1] < 0.0f ) {
					clip |= 4;
				} else if ( texCoords[1] > 1.0f ) {
					clip |= 8;
				}
				texCoords[0] = texCoords[0];
				texCoords[1] = texCoords[1];

				// modulate the strength based on the height and color
				if ( dist[2] > radius ) {
					clip |= 16;
					modulate = 0.0f;
				} else if ( dist[2] < -radius ) {
					clip |= 32;
					modulate = 0.0f;
				} else {
					dist[2] = Q_fabs(dist[2]);
					if ( dist[2] < radius * 0.5f ) {
						modulate = 1.0f;
					} else {
						modulate = 2.0f * (radius - dist[2]) * scale;
					}
				}
			}
			clipBits[i] = clip;
			colors[0] = ri.ftol(floatColor[0] * modulate);
			colors[1] = ri.ftol(floatColor[1] * modulate);
			colors[2] = ri.ftol(floatColor[2] * modulate);
			colors[3] = 255;
		}

		// build a list of triangles that need light
		numIndexes = 0;
		for ( i = 0 ; i < tess.numIndexes ; i += 3 ) {
			int		a, b, c;

			a = tess.indexes[i];
			b = tess.indexes[i+1];
			c = tess.indexes[i+2];
			if ( clipBits[a] & clipBits[b] & clipBits[c] ) {
				continue;	// not lighted
			}
			hitIndexes[numIndexes] = a;
			hitIndexes[numIndexes+1] = b;
			hitIndexes[numIndexes+2] = c;
			numIndexes += 3;
		}

		if ( !numIndexes ) {
			continue;
		}

		qglEnableClientState( GL_TEXTURE_COORD_ARRAY );
		qglTexCoordPointer( 2, GL_FLOAT, 0, texCoordsArray[0] );

		qglEnableClientState( GL_COLOR_ARRAY );
		qglColorPointer( 4, GL_UNSIGNED_BYTE, 0, colorArray );

		GL_Bind( tr.dlightImage );
		// include GLS_DEPTHFUNC_EQUAL so alpha tested surfaces don't add light
		// where they aren't rendered
		if ( dl->additive ) {
			GL_State( GLS_SRCBLEND_ONE | GLS_DSTBLEND_ONE | GLS_DEPTHFUNC_EQUAL );
		}
		else {
			GL_State( GLS_SRCBLEND_DST_COLOR | GLS_DSTBLEND_ONE | GLS_DEPTHFUNC_EQUAL );
		}
		R_DrawElements( numIndexes, hitIndexes );
		backEnd.pc.c_totalIndexes += numIndexes;
		backEnd.pc.c_dlightIndexes += numIndexes;
	}
}

//.........这里部分代码省略.........
		radius = dl->radius;
		radiusInverseCubed = dl->radiusInverseCubed;
		intensity = dl->intensity;
		floatColor[ 0 ] = dl->color[ 0 ] * 255.0f;
		floatColor[ 1 ] = dl->color[ 1 ] * 255.0f;
		floatColor[ 2 ] = dl->color[ 2 ] * 255.0f;

		// directional lights have max intensity and washout remainder intensity
		if ( dl->flags & REF_DIRECTED_DLIGHT ) {
			remainder = intensity * 0.125;
		} else {
			remainder = 0.0f;
		}

		// illuminate vertexes
		colors = tess.svars.colors[ 0 ];
		for ( i = 0; i < tess.numVertexes; i++, colors += 4 )
		{
			backEnd.pc.c_dlightVertexes++;

			// directional dlight, origin is a directional normal
			if ( dl->flags & REF_DIRECTED_DLIGHT ) {
				// twosided surfaces use absolute value of the calculated lighting
				modulate = intensity * DotProduct( dl->origin, tess.normal[ i ].v );
				if ( tess.shader->cullType == CT_TWO_SIDED ) {
					modulate = fabs( modulate );
				}
				modulate += remainder;
			}
			// ball dlight
			else
			{
				dir[ 0 ] = radius - fabs( origin[ 0 ] - tess.xyz[ i ].v[ 0 ] );
				if ( dir[ 0 ] <= 0.0f ) {
					continue;
				}
				dir[ 1 ] = radius - fabs( origin[ 1 ] - tess.xyz[ i ].v[ 1 ] );
				if ( dir[ 1 ] <= 0.0f ) {
					continue;
				}
				dir[ 2 ] = radius - fabs( origin[ 2 ] - tess.xyz[ i ].v[ 2 ] );
				if ( dir[ 2 ] <= 0.0f ) {
					continue;
				}

				modulate = intensity * dir[ 0 ] * dir[ 1 ] * dir[ 2 ] * radiusInverseCubed;
			}

			// optimizations
			if ( modulate < ( 1.0f / 128.0f ) ) {
				continue;
			} else if ( modulate > 1.0f ) {
				modulate = 1.0f;
			}

			// set color
			color = myftol( floatColor[ 0 ] * modulate );
			colors[ 0 ] = color > 255 ? 255 : color;
			color = myftol( floatColor[ 1 ] * modulate );
			colors[ 1 ] = color > 255 ? 255 : color;
			color = myftol( floatColor[ 2 ] * modulate );
			colors[ 2 ] = color > 255 ? 255 : color;
		}

		// build a list of triangles that need light
		intColors = (int*) tess.svars.colors;
		numIndexes = 0;
		for ( i = 0; i < tess.numIndexes; i += 3 )
		{
			a = tess.indexes[ i ];
			b = tess.indexes[ i + 1 ];
			c = tess.indexes[ i + 2 ];
			if ( !( intColors[ a ] | intColors[ b ] | intColors[ c ] ) ) {
				continue;
			}
			hitIndexes[ numIndexes++ ] = a;
			hitIndexes[ numIndexes++ ] = b;
			hitIndexes[ numIndexes++ ] = c;
		}

		if ( numIndexes == 0 ) {
			continue;
		}

		// debug code (fixme, there's a bug in this function!)
		//%	for( i = 0; i < numIndexes; i++ )
		//%		intColors[ hitIndexes[ i ] ] = 0x000000FF;

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

		R_FogOff();
		GL_Bind( tr.whiteImage );
		GL_State( GLS_SRCBLEND_DST_COLOR | GLS_DSTBLEND_ONE | GLS_DEPTHFUNC_EQUAL );
		R_DrawElements( numIndexes, hitIndexes );
		backEnd.pc.c_totalIndexes += numIndexes;
		backEnd.pc.c_dlightIndexes += numIndexes;
		R_FogOn();
	}
}

/*
** 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 = 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] );
	}

	//
	// 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_STD_DrawShaderPasses

Draw non-light dependent passes
=====================
*/
int RB_STD_DrawShaderPasses( drawSurf_t **drawSurfs, int numDrawSurfs ) {
	int				i;

	// only obey skipAmbient if we are rendering a view
	if ( backEnd.viewDef->viewEntitys && r_skipAmbient.GetBool() ) {
		return numDrawSurfs;
	}

	// if we are about to draw the first surface that needs
	// the rendering in a texture, copy it over
	if ( drawSurfs[0]->material->GetSort() >= SS_POST_PROCESS ) {
		if ( r_skipPostProcess.GetBool() ) {
			return 0;
		}

		// only dump if in a 3d view
		if ( backEnd.viewDef->viewEntitys && tr.backEndRenderer == BE_ARB2 ) {
			globalImages->currentRenderImage->CopyFramebuffer( backEnd.viewDef->viewport.x1,
				backEnd.viewDef->viewport.y1,  backEnd.viewDef->viewport.x2 -  backEnd.viewDef->viewport.x1 + 1,
				backEnd.viewDef->viewport.y2 -  backEnd.viewDef->viewport.y1 + 1, true );
		}
		backEnd.currentRenderCopied = true;
	}

	GL_SelectTexture( 1 );
	globalImages->BindNull();

	GL_SelectTexture( 0 );
	qglEnableClientState( GL_TEXTURE_COORD_ARRAY );

	RB_SetProgramEnvironment();

	// we don't use RB_RenderDrawSurfListWithFunction()
	// because we want to defer the matrix load because many
	// surfaces won't draw any ambient passes
	backEnd.currentSpace = NULL;
	for (i = 0  ; i < numDrawSurfs ; i++ ) {
		if ( drawSurfs[i]->material->SuppressInSubview() ) {
			continue;
		}

		if ( backEnd.viewDef->isXraySubview && drawSurfs[i]->space->entityDef ) {
			if ( drawSurfs[i]->space->entityDef->parms.xrayIndex != 2 ) {
				continue;
			}
		}

		// we need to draw the post process shaders after we have drawn the fog lights
		if ( drawSurfs[i]->material->GetSort() >= SS_POST_PROCESS
			&& !backEnd.currentRenderCopied ) {
			break;
		}

		RB_STD_T_RenderShaderPasses( drawSurfs[i] );
	}

	GL_Cull( CT_FRONT_SIDED );
	qglColor3f( 1, 1, 1 );

	return i;
}

/*
** RB_IterateStagesGeneric
*/
static void RB_IterateStagesGeneric( shaderCommands_t *input ) {
	int stage;

	for ( stage = 0; stage < MAX_SHADER_STAGES; stage++ )
	{
		shaderStage_t *pStage = tess.xstages[stage];

		if ( !pStage ) {
			break;
		}

		ComputeColors( pStage );
		ComputeTexCoords( pStage );

		if ( !setArraysOnce ) {
			qglEnableClientState( GL_COLOR_ARRAY );
			qglColorPointer( 4, GL_UNSIGNED_BYTE, 0, input->svars.colors );
		}

		//
		// do multitexture
		//
		if ( pStage->bundle[1].image[0] != 0 ) {
			DrawMultitextured( input, stage );
		} else
		{
			int fadeStart, fadeEnd;

			if ( !setArraysOnce ) {
				qglTexCoordPointer( 2, GL_FLOAT, 0, input->svars.texcoords[0] );
			}

			//
			// set state
			//
			R_BindAnimatedImage( &pStage->bundle[0] );

			// Ridah, per stage fogging (detail textures)
			if ( tess.shader->noFog && pStage->isFogged ) {
				R_FogOn();
			} else if ( tess.shader->noFog && !pStage->isFogged ) {
				R_FogOff(); // turn it back off
			} else {    // make sure it's on
				R_FogOn();
			}
			// done.

			//----(SA)	fading model stuff
			fadeStart = backEnd.currentEntity->e.fadeStartTime;

			if ( fadeStart ) {
				fadeEnd = backEnd.currentEntity->e.fadeEndTime;
				if ( fadeStart > tr.refdef.time ) {       // has not started to fade yet
					GL_State( pStage->stateBits );
				} else
				{
					int i;
					unsigned int tempState;
					float alphaval;

					if ( fadeEnd < tr.refdef.time ) {     // entity faded out completely
						continue;
					}

					alphaval = (float)( fadeEnd - tr.refdef.time ) / (float)( fadeEnd - fadeStart );

					tempState = pStage->stateBits;
					// remove the current blend, and don't write to Z buffer
					tempState &= ~( GLS_SRCBLEND_BITS | GLS_DSTBLEND_BITS | GLS_DEPTHMASK_TRUE );
					// set the blend to src_alpha, dst_one_minus_src_alpha
					tempState |= ( GLS_SRCBLEND_SRC_ALPHA | GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA );
					GL_State( tempState );
					GL_Cull( CT_FRONT_SIDED );
					// modulate the alpha component of each vertex in the render list
					for ( i = 0; i < tess.numVertexes; i++ ) {
						tess.svars.colors[i][0] *= alphaval;
						tess.svars.colors[i][1] *= alphaval;
						tess.svars.colors[i][2] *= alphaval;
						tess.svars.colors[i][3] *= alphaval;
					}
				}
			}
			//----(SA)	end
			// ydnar: lightmap stages should be GL_ONE GL_ZERO so they can be seen
			else if ( r_lightmap->integer && ( pStage->bundle[0].isLightmap || pStage->bundle[1].isLightmap ) ) {
				unsigned int stateBits;


				stateBits = ( pStage->stateBits & ~( GLS_SRCBLEND_BITS | GLS_DSTBLEND_BITS ) ) |
							( GLS_SRCBLEND_ONE | GLS_DSTBLEND_ZERO );
				GL_State( stateBits );
			} else {
				GL_State( pStage->stateBits );
			}

			//
			// draw
//.........这里部分代码省略.........

//.........这里部分代码省略.........
		plane[1] = mat[7];
		plane[2] = mat[11];
		plane[3] = mat[15];
		qglTexGenfv( GL_Q, GL_OBJECT_PLANE, plane );
	}

	if ( pStage->texture.texgen == TG_GLASSWARP ) {
		if ( tr.backEndRenderer == BE_ARB2 /*|| tr.backEndRenderer == BE_NV30*/ ) {
			qglBindProgramARB( GL_FRAGMENT_PROGRAM_ARB, FPROG_GLASSWARP );
			qglEnable( GL_FRAGMENT_PROGRAM_ARB );

			GL_SelectTexture( 2 );
			globalImages->scratchImage->Bind();

			GL_SelectTexture( 1 );
			globalImages->scratchImage2->Bind();

			qglEnable( GL_TEXTURE_GEN_S );
			qglEnable( GL_TEXTURE_GEN_T );
			qglEnable( GL_TEXTURE_GEN_Q );

			float	mat[16], plane[4];
			myGlMultMatrix( surf->space->modelViewMatrix, backEnd.viewDef->projectionMatrix, mat );

			plane[0] = mat[0];
			plane[1] = mat[4];
			plane[2] = mat[8];
			plane[3] = mat[12];
			qglTexGenfv( GL_S, GL_OBJECT_PLANE, plane );

			plane[0] = mat[1];
			plane[1] = mat[5];
			plane[2] = mat[9];
			plane[3] = mat[13];
			qglTexGenfv( GL_T, GL_OBJECT_PLANE, plane );

			plane[0] = mat[3];
			plane[1] = mat[7];
			plane[2] = mat[11];
			plane[3] = mat[15];
			qglTexGenfv( GL_Q, GL_OBJECT_PLANE, plane );

			GL_SelectTexture( 0 );
		}
	}

	if ( pStage->texture.texgen == TG_REFLECT_CUBE ) {
		if ( tr.backEndRenderer == BE_ARB2 ) {
			// see if there is also a bump map specified
			const shaderStage_t *bumpStage = surf->material->GetBumpStage();
			if ( bumpStage ) {
				// per-pixel reflection mapping with bump mapping
				GL_SelectTexture( 1 );
				bumpStage->texture.image->Bind();
				GL_SelectTexture( 0 );

				qglNormalPointer( GL_FLOAT, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );
				qglVertexAttribPointerARB( 10, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->tangents[1].ToFloatPtr() );
				qglVertexAttribPointerARB( 9, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->tangents[0].ToFloatPtr() );

				qglEnableVertexAttribArrayARB( 9 );
				qglEnableVertexAttribArrayARB( 10 );
				qglEnableClientState( GL_NORMAL_ARRAY );

				// Program env 5, 6, 7, 8 have been set in RB_SetProgramEnvironmentSpace

				qglBindProgramARB( GL_FRAGMENT_PROGRAM_ARB, FPROG_BUMPY_ENVIRONMENT );
				qglEnable( GL_FRAGMENT_PROGRAM_ARB );
				qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, VPROG_BUMPY_ENVIRONMENT );
				qglEnable( GL_VERTEX_PROGRAM_ARB );
			} else {
				// per-pixel reflection mapping without a normal map
				qglNormalPointer( GL_FLOAT, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );
				qglEnableClientState( GL_NORMAL_ARRAY );

				qglBindProgramARB( GL_FRAGMENT_PROGRAM_ARB, FPROG_ENVIRONMENT );
				qglEnable( GL_FRAGMENT_PROGRAM_ARB );
				qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, VPROG_ENVIRONMENT );
				qglEnable( GL_VERTEX_PROGRAM_ARB );
			}
		} else {
			qglEnable( GL_TEXTURE_GEN_S );
			qglEnable( GL_TEXTURE_GEN_T );
			qglEnable( GL_TEXTURE_GEN_R );
			qglTexGenf( GL_S, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_EXT );
			qglTexGenf( GL_T, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_EXT );
			qglTexGenf( GL_R, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_EXT );
			qglEnableClientState( GL_NORMAL_ARRAY );
			qglNormalPointer( GL_FLOAT, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );

			qglMatrixMode( GL_TEXTURE );
			float	mat[16];

			R_TransposeGLMatrix( backEnd.viewDef->worldSpace.modelViewMatrix, mat );

			qglLoadMatrixf( mat );
			qglMatrixMode( GL_MODELVIEW );
		}
	}
}

//.........这里部分代码省略.........
		}

		// skip the stages involved in lighting
		if ( pStage->lighting != SL_AMBIENT ) {
			continue;
		}

		// skip if the stage is ( GL_ZERO, GL_ONE ), which is used for some alpha masks
		if ( ( pStage->drawStateBits & (GLS_SRCBLEND_BITS|GLS_DSTBLEND_BITS) ) == ( GLS_SRCBLEND_ZERO | GLS_DSTBLEND_ONE ) ) {
			continue;
		}

		// see if we are a new-style stage
		newShaderStage_t *newStage = pStage->newStage;
		if ( newStage ) {
			//--------------------------
			//
			// new style stages
			//
			//--------------------------

			// completely skip the stage if we don't have the capability
			if ( tr.backEndRenderer != BE_ARB2 ) {
				continue;
			}
			if ( r_skipNewAmbient.GetBool() ) {
				continue;
			}
			qglColorPointer( 4, GL_UNSIGNED_BYTE, sizeof( idDrawVert ), (void *)&ac->color );
			qglVertexAttribPointerARB( 9, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->tangents[0].ToFloatPtr() );
			qglVertexAttribPointerARB( 10, 3, GL_FLOAT, false, sizeof( idDrawVert ), ac->tangents[1].ToFloatPtr() );
			qglNormalPointer( GL_FLOAT, sizeof( idDrawVert ), ac->normal.ToFloatPtr() );

			qglEnableClientState( GL_COLOR_ARRAY );
			qglEnableVertexAttribArrayARB( 9 );
			qglEnableVertexAttribArrayARB( 10 );
			qglEnableClientState( GL_NORMAL_ARRAY );

			GL_State( pStage->drawStateBits );

			qglBindProgramARB( GL_VERTEX_PROGRAM_ARB, newStage->vertexProgram );
			qglEnable( GL_VERTEX_PROGRAM_ARB );

			// megaTextures bind a lot of images and set a lot of parameters
			if ( newStage->megaTexture ) {
				newStage->megaTexture->SetMappingForSurface( tri );
				idVec3	localViewer;
				R_GlobalPointToLocal( surf->space->modelMatrix, backEnd.viewDef->renderView.vieworg, localViewer );
				newStage->megaTexture->BindForViewOrigin( localViewer );
			}

			for ( int i = 0 ; i < newStage->numVertexParms ; i++ ) {
				float	parm[4];
				parm[0] = regs[ newStage->vertexParms[i][0] ];
				parm[1] = regs[ newStage->vertexParms[i][1] ];
				parm[2] = regs[ newStage->vertexParms[i][2] ];
				parm[3] = regs[ newStage->vertexParms[i][3] ];
				qglProgramLocalParameter4fvARB( GL_VERTEX_PROGRAM_ARB, i, parm );
			}

			for ( int i = 0 ; i < newStage->numFragmentProgramImages ; i++ ) {
				if ( newStage->fragmentProgramImages[i] ) {
					GL_SelectTexture( i );
					newStage->fragmentProgramImages[i]->Bind();
				}
			}

void CQuickSpriteSystem::Flush(void)
{
	if (mNextVert==0)
	{
		return;
	}

	/*
	if (mUseFog && r_drawfog->integer == 2 &&
		mFogIndex == tr.world->globalFog)
	{ //enable hardware fog when we draw this thing if applicable -rww
		fog_t *fog = tr.world->fogs + mFogIndex;

		qglFogf(GL_FOG_MODE, GL_EXP2);
		qglFogf(GL_FOG_DENSITY, logtestExp2 / fog->parms.depthForOpaque);
		qglFogfv(GL_FOG_COLOR, fog->parms.color);
		qglEnable(GL_FOG);
	}
	*/
	//this should not be needed, since I just wait to disable fog for the surface til after surface sprites are done

	//
	// render the main pass
	//
	R_BindAnimatedImage( mTexBundle );
	GL_State(mGLStateBits);

	//
	// set arrays and lock
	//
	qglTexCoordPointer( 2, GL_FLOAT, 0, mTextureCoords );
	qglEnableClientState( GL_TEXTURE_COORD_ARRAY);

	qglEnableClientState( GL_COLOR_ARRAY);
	qglColorPointer( 4, GL_UNSIGNED_BYTE, 0, mColors );

	qglVertexPointer (3, GL_FLOAT, 16, mVerts);

	if ( qglLockArraysEXT )
	{
		qglLockArraysEXT(0, mNextVert);
		GLimp_LogComment( "glLockArraysEXT\n" );
	}

	qglDrawArrays(GL_QUADS, 0, mNextVert);

	backEnd.pc.c_vertexes += mNextVert;
	backEnd.pc.c_indexes += mNextVert;
	backEnd.pc.c_totalIndexes += mNextVert;

	//only for software fog pass (global soft/volumetric) -rww
	if (mUseFog && (r_drawfog->integer != 2 || mFogIndex != tr.world->globalFog))
	{
		fog_t *fog = tr.world->fogs + mFogIndex;

		//
		// render the fog pass
		//
		GL_Bind( tr.fogImage );
		GL_State( GLS_SRCBLEND_SRC_ALPHA | GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA | GLS_DEPTHFUNC_EQUAL );

		//
		// set arrays and lock
		//
		qglTexCoordPointer( 2, GL_FLOAT, 0, mFogTextureCoords);
//		qglEnableClientState( GL_TEXTURE_COORD_ARRAY);	// Done above

		qglDisableClientState( GL_COLOR_ARRAY );
		qglColor4ubv((GLubyte *)&fog->colorInt);

//		qglVertexPointer (3, GL_FLOAT, 16, mVerts);	// Done above

		qglDrawArrays(GL_QUADS, 0, mNextVert);

		// Second pass from fog
		backEnd.pc.c_totalIndexes += mNextVert;
	}

	//
	// unlock arrays
	//
	if (qglUnlockArraysEXT)
	{
		qglUnlockArraysEXT();
		GLimp_LogComment( "glUnlockArraysEXT\n" );
	}

	mNextVert=0;
}

/*
 * Interpolates between two frames and origins
 */
void
R_DrawAliasFrameLerp ( dmdl_t *paliashdr, float backlerp )
{
#if defined(VERTEX_ARRAYS)
    uint16_t total;
    GLenum type;
#endif
	float l;
	daliasframe_t   *frame, *oldframe;
	dtrivertx_t *v, *ov, *verts;
	int     *order;
	int count;
	float frontlerp;
	float alpha;
	vec3_t move, delta, vectors [ 3 ];
	vec3_t frontv, backv;
	int i;
	int index_xyz;
	float   *lerp;

	frame = (daliasframe_t *) ( (byte *) paliashdr + paliashdr->ofs_frames
								+ currententity->frame * paliashdr->framesize );
	verts = v = frame->verts;

	oldframe = (daliasframe_t *) ( (byte *) paliashdr + paliashdr->ofs_frames
								   + currententity->oldframe * paliashdr->framesize );
	ov = oldframe->verts;

	order = (int *) ( (byte *) paliashdr + paliashdr->ofs_glcmds );

	if ( currententity->flags & RF_TRANSLUCENT )
	{
		alpha = currententity->alpha;
	}
	else
	{
		alpha = 1.0;
	}

	if ( currententity->flags & ( RF_SHELL_RED | RF_SHELL_GREEN | RF_SHELL_BLUE | RF_SHELL_DOUBLE | RF_SHELL_HALF_DAM ) )
	{
		qglDisable( GL_TEXTURE_2D );
	}

	frontlerp = 1.0 - backlerp;

	/* move should be the delta back to the previous frame * backlerp */
	VectorSubtract( currententity->oldorigin, currententity->origin, delta );
	AngleVectors( currententity->angles, vectors [ 0 ], vectors [ 1 ], vectors [ 2 ] );

	move [ 0 ] = DotProduct( delta, vectors [ 0 ] );   /* forward */
	move [ 1 ] = -DotProduct( delta, vectors [ 1 ] );  /* left */
	move [ 2 ] = DotProduct( delta, vectors [ 2 ] );   /* up */

	VectorAdd( move, oldframe->translate, move );

	for ( i = 0; i < 3; i++ )
	{
		move [ i ] = backlerp * move [ i ] + frontlerp * frame->translate [ i ];
	}

	for ( i = 0; i < 3; i++ )
	{
		frontv [ i ] = frontlerp * frame->