示例#1
0
/*
===============
ComputeColors
===============
*/
static void ComputeColors( shaderStage_t *pStage ) {
	int i;

	//
	// rgbGen
	//
	switch ( pStage->rgbGen )
	{
	case CGEN_IDENTITY:
		memset( tess.svars.colors, 0xff, tess.numVertexes * 4 );
		break;
	default:
	case CGEN_IDENTITY_LIGHTING:
		memset( tess.svars.colors, tr.identityLightByte, tess.numVertexes * 4 );
		break;
	case CGEN_LIGHTING_DIFFUSE:
		RB_CalcDiffuseColor( ( unsigned char * ) tess.svars.colors );
		break;
	case CGEN_EXACT_VERTEX:
		memcpy( tess.svars.colors, tess.vertexColors, tess.numVertexes * sizeof( tess.vertexColors[0].v ) );
		break;
	case CGEN_CONST:
		for ( i = 0; i < tess.numVertexes; i++ ) {
			*(int *)tess.svars.colors[i] = *(int *)pStage->constantColor;
		}
		break;
	case CGEN_VERTEX:
		if ( tr.identityLight == 1 ) {
			memcpy( tess.svars.colors, tess.vertexColors, tess.numVertexes * sizeof( tess.vertexColors[0].v ) );
		} else
		{
			for ( i = 0; i < tess.numVertexes; i++ )
			{
				tess.svars.colors[i][0] = tess.vertexColors[i].v[0] * tr.identityLight;
				tess.svars.colors[i][1] = tess.vertexColors[i].v[1] * tr.identityLight;
				tess.svars.colors[i][2] = tess.vertexColors[i].v[2] * tr.identityLight;
				tess.svars.colors[i][3] = tess.vertexColors[i].v[3];
			}
		}
		break;
	case CGEN_ONE_MINUS_VERTEX:
		if ( tr.identityLight == 1 ) {
			for ( i = 0; i < tess.numVertexes; i++ )
			{
				tess.svars.colors[i][0] = 255 - tess.vertexColors[i].v[0];
				tess.svars.colors[i][1] = 255 - tess.vertexColors[i].v[1];
				tess.svars.colors[i][2] = 255 - tess.vertexColors[i].v[2];
			}
		} else
		{
			for ( i = 0; i < tess.numVertexes; i++ )
			{
				tess.svars.colors[i][0] = ( 255 - tess.vertexColors[i].v[0] ) * tr.identityLight;
				tess.svars.colors[i][1] = ( 255 - tess.vertexColors[i].v[1] ) * tr.identityLight;
				tess.svars.colors[i][2] = ( 255 - tess.vertexColors[i].v[2] ) * tr.identityLight;
			}
		}
		break;
	case CGEN_FOG:
	{
		fog_t       *fog;

		fog = tr.world->fogs + tess.fogNum;

		for ( i = 0; i < tess.numVertexes; i++ ) {
			*( int * )&tess.svars.colors[i] = fog->shader->fogParms.colorInt;
		}
	}
	break;
	case CGEN_WAVEFORM:
		RB_CalcWaveColor( &pStage->rgbWave, ( unsigned char * ) tess.svars.colors );
		break;
	case CGEN_ENTITY:
		RB_CalcColorFromEntity( ( unsigned char * ) tess.svars.colors );
		break;
	case CGEN_ONE_MINUS_ENTITY:
		RB_CalcColorFromOneMinusEntity( ( unsigned char * ) tess.svars.colors );
		break;
	}

	//
	// alphaGen
	//
	switch ( pStage->alphaGen )
	{
	case AGEN_SKIP:
		break;
	case AGEN_IDENTITY:
		if ( pStage->rgbGen != CGEN_IDENTITY ) {
			if ( ( pStage->rgbGen == CGEN_VERTEX && tr.identityLight != 1 ) ||
				 pStage->rgbGen != CGEN_VERTEX ) {
				for ( i = 0; i < tess.numVertexes; i++ ) {
					tess.svars.colors[i][3] = 0xff;
				}
			}
		}
		break;
	case AGEN_CONST:
		if ( pStage->rgbGen != CGEN_CONST ) {
			for ( i = 0; i < tess.numVertexes; i++ ) {
				tess.svars.colors[i][3] = pStage->constantColor[3];
			}
		}
		break;
	case AGEN_WAVEFORM:
		RB_CalcWaveAlpha( &pStage->alphaWave, ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_LIGHTING_SPECULAR:
		RB_CalcSpecularAlpha( ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_ENTITY:
		RB_CalcAlphaFromEntity( ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_ONE_MINUS_ENTITY:
		RB_CalcAlphaFromOneMinusEntity( ( unsigned char * ) tess.svars.colors );
		break;
		// Ridah
	case AGEN_NORMALZFADE:
	{
		float alpha, range, lowest, highest, dot;
		vec3_t worldUp;
		qboolean zombieEffect = qfalse;

		if ( VectorCompare( backEnd.currentEntity->e.fireRiseDir, vec3_origin ) ) {
			VectorSet( backEnd.currentEntity->e.fireRiseDir, 0, 0, 1 );
		}

		if ( backEnd.currentEntity->e.hModel ) {    // world surfaces dont have an axis
			VectorRotate( backEnd.currentEntity->e.fireRiseDir, backEnd.currentEntity->e.axis, worldUp );
		} else {
			VectorCopy( backEnd.currentEntity->e.fireRiseDir, worldUp );
		}

		lowest = pStage->zFadeBounds[0];
		if ( lowest == -1000 ) {    // use entity alpha
			lowest = backEnd.currentEntity->e.shaderTime;
			zombieEffect = qtrue;
		}
		highest = pStage->zFadeBounds[1];
		if ( highest == -1000 ) {   // use entity alpha
			highest = backEnd.currentEntity->e.shaderTime;
			zombieEffect = qtrue;
		}
		range = highest - lowest;
		for ( i = 0; i < tess.numVertexes; i++ ) {
			dot = DotProduct( tess.normal[i].v, worldUp );

			// special handling for Zombie fade effect
			if ( zombieEffect ) {
				alpha = (float)backEnd.currentEntity->e.shaderRGBA[3] * ( dot + 1.0 ) / 2.0;
				alpha += ( 2.0 * (float)backEnd.currentEntity->e.shaderRGBA[3] ) * ( 1.0 - ( dot + 1.0 ) / 2.0 );
				if ( alpha > 255.0 ) {
					alpha = 255.0;
				} else if ( alpha < 0.0 ) {
					alpha = 0.0;
				}
				tess.svars.colors[i][3] = (byte)( alpha );
				continue;
			}

			if ( dot < highest ) {
				if ( dot > lowest ) {
					if ( dot < lowest + range / 2 ) {
						alpha = ( (float)pStage->constantColor[3] * ( ( dot - lowest ) / ( range / 2 ) ) );
					} else {
						alpha = ( (float)pStage->constantColor[3] * ( 1.0 - ( ( dot - lowest - range / 2 ) / ( range / 2 ) ) ) );
					}
					if ( alpha > 255.0 ) {
						alpha = 255.0;
					} else if ( alpha < 0.0 ) {
						alpha = 0.0;
					}

					// finally, scale according to the entity's alpha
					if ( backEnd.currentEntity->e.hModel ) {
						alpha *= (float)backEnd.currentEntity->e.shaderRGBA[3] / 255.0;
					}

					tess.svars.colors[i][3] = (byte)( alpha );
				} else {
					tess.svars.colors[i][3] = 0;
				}
			} else {
				tess.svars.colors[i][3] = 0;
			}
		}
	}
	break;
		// done.
	case AGEN_VERTEX:
		if ( pStage->rgbGen != CGEN_VERTEX ) {
			for ( i = 0; i < tess.numVertexes; i++ ) {
				tess.svars.colors[i][3] = tess.vertexColors[i].v[3];
			}
		}
		break;
	case AGEN_ONE_MINUS_VERTEX:
		for ( i = 0; i < tess.numVertexes; i++ )
		{
			tess.svars.colors[i][3] = 255 - tess.vertexColors[i].v[3];
		}
		break;
	case AGEN_PORTAL:
	{
		unsigned char alpha;

		for ( i = 0; i < tess.numVertexes; i++ )
		{
			float len;
			vec3_t v;

			VectorSubtract( tess.xyz[i].v, backEnd.viewParms.orientation.origin, v );
			len = VectorLength( v );

			len /= tess.shader->portalRange;

			if ( len < 0 ) {
				alpha = 0;
			} else if ( len > 1 )   {
				alpha = 0xff;
			} else
			{
				alpha = len * 0xff;
			}

			tess.svars.colors[i][3] = alpha;
		}
	}
	break;
	}

	//
	// fog adjustment for colors to fade out as fog increases
	//
	if ( tess.fogNum && !tess.shader->noFog ) {
		switch ( pStage->adjustColorsForFog )
		{
		case ACFF_MODULATE_RGB:
			RB_CalcModulateColorsByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_MODULATE_ALPHA:
			RB_CalcModulateAlphasByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_MODULATE_RGBA:
			RB_CalcModulateRGBAsByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_NONE:
			break;
		}
	}
}
示例#2
0
文件: tr_shade.c 项目: ptitSeb/ioq3
/*
===============
ComputeColors
===============
*/
static void ComputeColors( shaderStage_t *pStage )
{
	int		i;

	//
	// rgbGen
	//
	switch ( pStage->rgbGen )
	{
		case CGEN_IDENTITY:
			Com_Memset( tess.svars.colors, 0xff, tess.numVertexes * 4 );
			break;
		default:
		case CGEN_IDENTITY_LIGHTING:
			Com_Memset( tess.svars.colors, tr.identityLightByte, tess.numVertexes * 4 );
			break;
		case CGEN_LIGHTING_DIFFUSE:
			RB_CalcDiffuseColor( ( unsigned char * ) tess.svars.colors );
			break;
		case CGEN_EXACT_VERTEX:
			Com_Memcpy( tess.svars.colors, tess.vertexColors, tess.numVertexes * sizeof( tess.vertexColors[0] ) );
			break;
		case CGEN_CONST:
			for ( i = 0; i < tess.numVertexes; i++ ) {
				*(int *)tess.svars.colors[i] = *(int *)pStage->constantColor;
			}
			break;
		case CGEN_VERTEX:
			if ( tr.identityLight == 1 )
			{
				Com_Memcpy( tess.svars.colors, tess.vertexColors, tess.numVertexes * sizeof( tess.vertexColors[0] ) );
			}
			else
			{
				for ( i = 0; i < tess.numVertexes; i++ )
				{
					tess.svars.colors[i][0] = tess.vertexColors[i][0] * tr.identityLight;
					tess.svars.colors[i][1] = tess.vertexColors[i][1] * tr.identityLight;
					tess.svars.colors[i][2] = tess.vertexColors[i][2] * tr.identityLight;
					tess.svars.colors[i][3] = tess.vertexColors[i][3];
				}
			}
			break;
		case CGEN_ONE_MINUS_VERTEX:
			if ( tr.identityLight == 1 )
			{
				for ( i = 0; i < tess.numVertexes; i++ )
				{
					tess.svars.colors[i][0] = 255 - tess.vertexColors[i][0];
					tess.svars.colors[i][1] = 255 - tess.vertexColors[i][1];
					tess.svars.colors[i][2] = 255 - tess.vertexColors[i][2];
				}
			}
			else
			{
				for ( i = 0; i < tess.numVertexes; i++ )
				{
					tess.svars.colors[i][0] = ( 255 - tess.vertexColors[i][0] ) * tr.identityLight;
					tess.svars.colors[i][1] = ( 255 - tess.vertexColors[i][1] ) * tr.identityLight;
					tess.svars.colors[i][2] = ( 255 - tess.vertexColors[i][2] ) * tr.identityLight;
				}
			}
			break;
		case CGEN_FOG:
			{
				fog_t		*fog;

				fog = tr.world->fogs + tess.fogNum;

				for ( i = 0; i < tess.numVertexes; i++ ) {
					* ( int * )&tess.svars.colors[i] = fog->colorInt;
				}
			}
			break;
		case CGEN_WAVEFORM:
			RB_CalcWaveColor( &pStage->rgbWave, ( unsigned char * ) tess.svars.colors );
			break;
		case CGEN_ENTITY:
			RB_CalcColorFromEntity( ( unsigned char * ) tess.svars.colors );
			break;
		case CGEN_ONE_MINUS_ENTITY:
			RB_CalcColorFromOneMinusEntity( ( unsigned char * ) tess.svars.colors );
			break;
	}

	//
	// alphaGen
	//
	switch ( pStage->alphaGen )
	{
	case AGEN_SKIP:
		break;
	case AGEN_IDENTITY:
		if ( pStage->rgbGen != CGEN_IDENTITY ) {
			if ( ( pStage->rgbGen == CGEN_VERTEX && tr.identityLight != 1 ) ||
				 pStage->rgbGen != CGEN_VERTEX ) {
				for ( i = 0; i < tess.numVertexes; i++ ) {
					tess.svars.colors[i][3] = 0xff;
				}
			}
		}
		break;
	case AGEN_CONST:
		if ( pStage->rgbGen != CGEN_CONST ) {
			for ( i = 0; i < tess.numVertexes; i++ ) {
				tess.svars.colors[i][3] = pStage->constantColor[3];
			}
		}
		break;
	case AGEN_WAVEFORM:
		RB_CalcWaveAlpha( &pStage->alphaWave, ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_LIGHTING_SPECULAR:
		RB_CalcSpecularAlpha( ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_ENTITY:
		RB_CalcAlphaFromEntity( ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_ONE_MINUS_ENTITY:
		RB_CalcAlphaFromOneMinusEntity( ( unsigned char * ) tess.svars.colors );
		break;
    case AGEN_VERTEX:
		if ( pStage->rgbGen != CGEN_VERTEX ) {
			for ( i = 0; i < tess.numVertexes; i++ ) {
				tess.svars.colors[i][3] = tess.vertexColors[i][3];
			}
		}
        break;
    case AGEN_ONE_MINUS_VERTEX:
        for ( i = 0; i < tess.numVertexes; i++ )
        {
			tess.svars.colors[i][3] = 255 - tess.vertexColors[i][3];
        }
        break;
	case AGEN_PORTAL:
		{
			unsigned char alpha;

			for ( i = 0; i < tess.numVertexes; i++ )
			{
				float len;
				vec3_t v;

				VectorSubtract( tess.xyz[i], backEnd.viewParms.or.origin, v );
				len = VectorLength( v );

				len /= tess.shader->portalRange;

				if ( len < 0 )
				{
					alpha = 0;
				}
				else if ( len > 1 )
				{
					alpha = 0xff;
				}
				else
				{
					alpha = len * 0xff;
				}

				tess.svars.colors[i][3] = alpha;
			}
		}
		break;
	}

	//
	// fog adjustment for colors to fade out as fog increases
	//
	if ( tess.fogNum )
	{
		switch ( pStage->adjustColorsForFog )
		{
		case ACFF_MODULATE_RGB:
			RB_CalcModulateColorsByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_MODULATE_ALPHA:
			RB_CalcModulateAlphasByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_MODULATE_RGBA:
			RB_CalcModulateRGBAsByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_NONE:
			break;
		}
	}
	
	// if in greyscale rendering mode turn all color values into greyscale.
	if(r_greyscale->integer)
	{
		int scale;
		for(i = 0; i < tess.numVertexes; i++)
		{
			scale = LUMA(tess.svars.colors[i][0], tess.svars.colors[i][1], tess.svars.colors[i][2]);
 			tess.svars.colors[i][0] = tess.svars.colors[i][1] = tess.svars.colors[i][2] = scale;
		}
	}
	else if(r_greyscale->value)
	{
		float scale;
		
		for(i = 0; i < tess.numVertexes; i++)
		{
			scale = LUMA(tess.svars.colors[i][0], tess.svars.colors[i][1], tess.svars.colors[i][2]);
			tess.svars.colors[i][0] = LERP(tess.svars.colors[i][0], scale, r_greyscale->value);
			tess.svars.colors[i][1] = LERP(tess.svars.colors[i][1], scale, r_greyscale->value);
			tess.svars.colors[i][2] = LERP(tess.svars.colors[i][2], scale, r_greyscale->value);
		}
	}
}
示例#3
0
static void ComputeColors( shaderStage_t *pStage, int forceRGBGen )
{
	int			i;
	color4ub_t	*colors = tess.svars.colors;
	qboolean killGen = qfalse;
	alphaGen_t forceAlphaGen = pStage->alphaGen;//set this up so we can override below

	if ( tess.shader != tr.projectionShadowShader && tess.shader != tr.shadowShader &&
			( backEnd.currentEntity->e.renderfx & (RF_DISINTEGRATE1|RF_DISINTEGRATE2)))
	{
		RB_CalcDisintegrateColors( (unsigned char *)tess.svars.colors );
		RB_CalcDisintegrateVertDeform();

		// We've done some custom alpha and color stuff, so we can skip the rest.  Let it do fog though
		killGen = qtrue;
	}

	//
	// rgbGen
	//
	if ( !forceRGBGen )
	{
		forceRGBGen = pStage->rgbGen;
	}

	if ( backEnd.currentEntity->e.renderfx & RF_VOLUMETRIC ) // does not work for rotated models, technically, this should also be a CGEN type, but that would entail adding new shader commands....which is too much work for one thing
	{
		int			i;
		float		*normal, dot;
		unsigned char *color;
		int			numVertexes;

		normal = tess.normal[0];
		color = tess.svars.colors[0];

		numVertexes = tess.numVertexes;

		for ( i = 0 ; i < numVertexes ; i++, normal += 4, color += 4)
		{
			dot = DotProduct( normal, backEnd.refdef.viewaxis[0] );

			dot *= dot * dot * dot;

			if ( dot < 0.2f ) // so low, so just clamp it
			{
				dot = 0.0f;
			}

			color[0] = color[1] = color[2] = color[3] = Q_ftol( backEnd.currentEntity->e.shaderRGBA[0] * (1-dot) );
		}

		killGen = qtrue;
	}

	if (killGen)
	{
		goto avoidGen;
	}

	//
	// rgbGen
	//
	switch ( forceRGBGen )
	{
		case CGEN_IDENTITY:
			memset( tess.svars.colors, 0xff, tess.numVertexes * 4 );
			break;
		default:
		case CGEN_IDENTITY_LIGHTING:
			memset( tess.svars.colors, tr.identityLightByte, tess.numVertexes * 4 );
			break;
		case CGEN_LIGHTING_DIFFUSE:
			RB_CalcDiffuseColor( ( unsigned char * ) tess.svars.colors );
			break;
		case CGEN_LIGHTING_DIFFUSE_ENTITY:
			RB_CalcDiffuseEntityColor( ( unsigned char * ) tess.svars.colors );
			if ( forceAlphaGen == AGEN_IDENTITY &&
				 backEnd.currentEntity->e.shaderRGBA[3] == 0xff
				)
			{
				forceAlphaGen = AGEN_SKIP;	//already got it in this set since it does all 4 components
			}
			break;
		case CGEN_EXACT_VERTEX:
			memcpy( tess.svars.colors, tess.vertexColors, tess.numVertexes * sizeof( tess.vertexColors[0] ) );
			break;
		case CGEN_CONST:
			for ( i = 0; i < tess.numVertexes; i++ ) {
				byteAlias_t *baDest = (byteAlias_t *)&tess.svars.colors[i],
					*baSource = (byteAlias_t *)&pStage->constantColor;
				baDest->i = baSource->i;
			}
			break;
		case CGEN_VERTEX:
			if ( tr.identityLight == 1 )
			{
				memcpy( tess.svars.colors, tess.vertexColors, tess.numVertexes * sizeof( tess.vertexColors[0] ) );
			}
			else
			{
				for ( i = 0; i < tess.numVertexes; i++ )
				{
					tess.svars.colors[i][0] = tess.vertexColors[i][0] * tr.identityLight;
					tess.svars.colors[i][1] = tess.vertexColors[i][1] * tr.identityLight;
					tess.svars.colors[i][2] = tess.vertexColors[i][2] * tr.identityLight;
					tess.svars.colors[i][3] = tess.vertexColors[i][3];
				}
			}
			break;
		case CGEN_ONE_MINUS_VERTEX:
			if ( tr.identityLight == 1 )
			{
				for ( i = 0; i < tess.numVertexes; i++ )
				{
					tess.svars.colors[i][0] = 255 - tess.vertexColors[i][0];
					tess.svars.colors[i][1] = 255 - tess.vertexColors[i][1];
					tess.svars.colors[i][2] = 255 - tess.vertexColors[i][2];
				}
			}
			else
			{
				for ( i = 0; i < tess.numVertexes; i++ )
				{
					tess.svars.colors[i][0] = ( 255 - tess.vertexColors[i][0] ) * tr.identityLight;
					tess.svars.colors[i][1] = ( 255 - tess.vertexColors[i][1] ) * tr.identityLight;
					tess.svars.colors[i][2] = ( 255 - tess.vertexColors[i][2] ) * tr.identityLight;
				}
			}
			break;
		case CGEN_FOG:
			{
				fog_t		*fog;

				fog = tr.world->fogs + tess.fogNum;

				for ( i = 0; i < tess.numVertexes; i++ ) {
					byteAlias_t *ba = (byteAlias_t *)&tess.svars.colors[i];
					ba->i = fog->colorInt;
				}
			}
			break;
		case CGEN_WAVEFORM:
			RB_CalcWaveColor( &pStage->rgbWave, ( unsigned char * ) tess.svars.colors );
			break;
		case CGEN_ENTITY:
			RB_CalcColorFromEntity( ( unsigned char * ) tess.svars.colors );
			if ( forceAlphaGen == AGEN_IDENTITY &&
				 backEnd.currentEntity->e.shaderRGBA[3] == 0xff
				)
			{
				forceAlphaGen = AGEN_SKIP;	//already got it in this set since it does all 4 components
			}
			break;
		case CGEN_ONE_MINUS_ENTITY:
			RB_CalcColorFromOneMinusEntity( ( unsigned char * ) tess.svars.colors );
			break;
		case CGEN_LIGHTMAPSTYLE:
			for ( i = 0; i < tess.numVertexes; i++ )
			{
				byteAlias_t *baDest = (byteAlias_t *)&tess.svars.colors[i],
					*baSource = (byteAlias_t *)&styleColors[pStage->lightmapStyle];
				baDest->i = baSource->i;
			}
			break;
	}

	//
	// alphaGen
	//
	switch ( pStage->alphaGen )
	{
	case AGEN_SKIP:
		break;
	case AGEN_IDENTITY:
		if ( forceRGBGen != CGEN_IDENTITY ) {
			if ( ( forceRGBGen == CGEN_VERTEX && tr.identityLight != 1 ) ||
				 forceRGBGen != CGEN_VERTEX ) {
				for ( i = 0; i < tess.numVertexes; i++ ) {
					tess.svars.colors[i][3] = 0xff;
				}
			}
		}
		break;
	case AGEN_CONST:
		if ( forceRGBGen != CGEN_CONST ) {
			for ( i = 0; i < tess.numVertexes; i++ ) {
				tess.svars.colors[i][3] = pStage->constantColor[3];
			}
		}
		break;
	case AGEN_WAVEFORM:
		RB_CalcWaveAlpha( &pStage->alphaWave, ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_LIGHTING_SPECULAR:
		RB_CalcSpecularAlpha( ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_ENTITY:
		RB_CalcAlphaFromEntity( ( unsigned char * ) tess.svars.colors );
		break;
	case AGEN_ONE_MINUS_ENTITY:
		RB_CalcAlphaFromOneMinusEntity( ( unsigned char * ) tess.svars.colors );
		break;
    case AGEN_VERTEX:
		if ( forceRGBGen != CGEN_VERTEX ) {
			for ( i = 0; i < tess.numVertexes; i++ ) {
				tess.svars.colors[i][3] = tess.vertexColors[i][3];
			}
		}
        break;
    case AGEN_ONE_MINUS_VERTEX:
        for ( i = 0; i < tess.numVertexes; i++ )
        {
			tess.svars.colors[i][3] = 255 - tess.vertexColors[i][3];
        }
        break;
	case AGEN_PORTAL:
		{
			unsigned char alpha;

			for ( i = 0; i < tess.numVertexes; i++ )
			{
				float len;
				vec3_t v;

				VectorSubtract( tess.xyz[i], backEnd.viewParms.ori.origin, v );
				len = VectorLength( v );

				len /= tess.shader->portalRange;

				if ( len < 0 )
				{
					alpha = 0;
				}
				else if ( len > 1 )
				{
					alpha = 0xff;
				}
				else
				{
					alpha = len * 0xff;
				}

				tess.svars.colors[i][3] = alpha;
			}
		}
		break;
	case AGEN_BLEND:
		if ( forceRGBGen != CGEN_VERTEX )
		{
			for ( i = 0; i < tess.numVertexes; i++ )
			{
				colors[i][3] = tess.vertexAlphas[i][pStage->index]; //rwwRMG - added support
			}
		}
		break;
	default:
		break;
	}
avoidGen:
	//
	// fog adjustment for colors to fade out as fog increases
	//
	if ( tess.fogNum )
	{
		switch ( pStage->adjustColorsForFog )
		{
		case ACFF_MODULATE_RGB:
			RB_CalcModulateColorsByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_MODULATE_ALPHA:
			RB_CalcModulateAlphasByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_MODULATE_RGBA:
			RB_CalcModulateRGBAsByFog( ( unsigned char * ) tess.svars.colors );
			break;
		case ACFF_NONE:
			break;
		}
	}
}