Justin Marshall
38 lines
1.1 KiB
Plaintext
38 lines
1.1 KiB
Plaintext
{
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parms {
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}
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state {
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blend GL_ONE_MINUS_SRC_ALPHA GL_SRC_ALPHA
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depthfunc GL_ALWAYS
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depthmask
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alphamask
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twosided
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}
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hlsl_vp {
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result.position = vertex.position;
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result.texcoord0 = vertex.texcoord0.xyxy;
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#if defined( PS3 ) || defined( XBOX )
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result.texcoord0.y = 1.0 - vertex.texcoord0.y;
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#endif
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}
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hlsl_fp {
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float2 texcoord = fragment.texcoord0.xy;
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// Note that the sky box does not draw depth and we rely on reading
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// a depth value of >= 1.0 such that no fog is applied to the sky.
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#if defined( XBOX )
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float ndcZ = tex2Ddepth_fast( $viewDepthMap, texcoord.xy );
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#elif defined( PS3 )
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// add a tiny value to make sure we get a depth value of 1.0 at infinity
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float ndcZ = tex2Ddepth_fast( $viewDepthMap, texcoord.xy ) * 2.0 - 1.0 + ( 2.0 / 16777216.0 );
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#else
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float ndcZ = tex2Ddepth_fast( $viewDepthMap, texcoord.xy ) * 2.0 - 1.0;
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#endif
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float viewZ = ndcZ * $projectionMatrixZ.w / ( ndcZ + $projectionMatrixZ.z );
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const float fogDepth = clamp( viewZ - $fogStart.x, 0.0, $fogEnd.x ) * $fogScale.x;
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const float fog = saturate( exp2( -fogDepth ) );
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result.color.xyz = $fogColor.xyz;
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result.color.w = fog;
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}
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} |