Justin Marshall
112 lines
4.7 KiB
Plaintext
112 lines
4.7 KiB
Plaintext
{
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parms {
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}
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state {
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blend GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA
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depthFunc GL_GREATER // we are also relying on the stencil buffer already being set
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depthMask
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alphaMask
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stencilFunc EQUAL 1 255 // only draw on stencil = STENCIL_SHADOW
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stencilop KEEP KEEP KEEP
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}
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hlsl_vp {
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float4 pos = vertex.position;
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float3 normal = vertex.normal.xyz * 2.0 - 1.0;
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if ( dot3( normal, $dimShadowExtrude ) > 0.0 ) {
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float dist = dot4( pos, $dimShadowClipPlane );
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float closing = dot3( $dimShadowExtrude.xyz, $dimShadowClipPlane.xyz );
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pos.xyz -= $dimShadowExtrude.xyz * ( dist / closing );
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}
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result.position.x = dot4( pos, $mvpMatrixX );
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result.position.y = dot4( pos, $mvpMatrixY );
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result.position.z = dot4( pos, $mvpMatrixZ );
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result.position.w = dot4( pos, $mvpMatrixW );
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}
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hlsl_fp {
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// this is normalized window space, not strict openGL window space
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// that uses integer viewport values.
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float3 window;
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window.xy = screenPosToTexcoord( fragment.position.xy, $renderPositionToViewTexture );
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// fetch the window space depth value
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window.z = tex2Ddepth( $viewDepthMap, window.xy );
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float4 wclip = float4( window.xyz, 1.0f );
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// now transform to the light clip space
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float4 light;
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light.x = dot4( wclip, $windowPosToDimShadowBlurS );
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light.y = dot4( wclip, $windowPosToDimShadowBlurT );
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light.z = dot4( wclip, $windowPosToDimShadowBlurR );
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light.w = dot4( wclip, $windowPosToDimShadowBlurQ );
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// divide by w to get to light device coordinates
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light.xyz /= light.w;
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// move the -1.0 - 1.0 light device st to the 0.0 - 1.0 texture range
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#if defined( XBOX )
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light.xy = ( light.xy * 0.5 ) + 0.5; // don't adjust z, it is already 0 - 1
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#else
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light = ( light * 0.5 ) + 0.5;
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#endif
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#if defined( XBOX ) || defined( PS3 )
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light.y = 1.0 - light.y; // image y origin adjust
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#endif
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// Make sure that the cleared z = 1.0 in the shadow buffer
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// will always be farther away than any world surface. This is necessary
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// because the extruded box can contain areas that are outside the actual
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// projection.
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light.z = min( light.z, 0.9999999 );
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float2 tc = fragment.position.xy * float2( 1.0/128, 1.0/128 ) + $viewRandom.xy;
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float2 dither = tex2D( $dither256map, tc ).xw;
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const float step = 1.0 / 768.0;
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float3 center;
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// this biases by +1.5 on average, so we can test -3, -2, -1, 0 offsets
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center.xy = light.xy + step + dither * step;
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center.z = light.z;
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#if defined( XBOX )
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float shadow;
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shadow = shadow2Ddepth( $dimShadowDepthMap, center + float3( -2*step, -2*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -1*step, -2*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( 0*step, -2*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -3*step, -2*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -2*step, -1*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -1*step, -1*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( 0*step, -1*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -3*step, -1*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -2*step, 0*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -1*step, 0*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( 0*step, 0*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -3*step, 0*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -2*step, -3*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -1*step, -3*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( 0*step, -3*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -3*step, -3*step, 0 ) );
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shadow *= 0.0625;
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#else
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// the PC and PS3 takes advantage of hardware PCF
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float shadow;
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shadow = shadow2Ddepth( $dimShadowDepthMap, center + float3( -2*step, -2*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -1*step, -2*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -2*step, -1*step, 0 ) );
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shadow += shadow2Ddepth( $dimShadowDepthMap, center + float3( -1*step, -1*step, 0 ) );
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shadow *= 0.25;
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#endif
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// get the amount of shadow accepted by the surface from the alpha channel
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float acceptShadow = tex2D( $viewColorMap, window.xy ).w;
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// only use a fraction of the dimshadow value, since we can't separate the
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// contribution along the shadow from the remainder
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shadow = ( 1.0 - shadow ) * acceptShadow * $dimshadowfade.x;
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result.color = float4( 0.0, 0.0, 0.0, shadow );
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}
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} |