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depth bias

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This commit is contained in:
scrawl 2012-07-23 18:25:20 +02:00
parent d5384403f3
commit 9f9183ff73
1 changed files with 6 additions and 4 deletions
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10
files/materials/shadows.h
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@ -1,13 +1,15 @@
#define FIXED_BIAS 0.005
float depthShadowPCF (shTexture2D shadowMap, float4 shadowMapPos, float2 offset)
{
shadowMapPos /= shadowMapPos.w;
float3 o = float3(offset.xy, -offset.x) * 0.3;
//float3 o = float3(0,0,0);
float c = (shadowMapPos.z <= shSample(shadowMap, shadowMapPos.xy - o.xy).r) ? 1 : 0; // top left
c += (shadowMapPos.z <= shSample(shadowMap, shadowMapPos.xy + o.xy).r) ? 1 : 0; // bottom right
c += (shadowMapPos.z <= shSample(shadowMap, shadowMapPos.xy + o.zy).r) ? 1 : 0; // bottom left
c += (shadowMapPos.z <= shSample(shadowMap, shadowMapPos.xy - o.zy).r) ? 1 : 0; // top right
float c = (shadowMapPos.z <= FIXED_BIAS + shSample(shadowMap, shadowMapPos.xy - o.xy).r) ? 1 : 0; // top left
c += (shadowMapPos.z <= FIXED_BIAS + shSample(shadowMap, shadowMapPos.xy + o.xy).r) ? 1 : 0; // bottom right
c += (shadowMapPos.z <= FIXED_BIAS + shSample(shadowMap, shadowMapPos.xy + o.zy).r) ? 1 : 0; // bottom left
c += (shadowMapPos.z <= FIXED_BIAS + shSample(shadowMap, shadowMapPos.xy - o.zy).r) ? 1 : 0; // top right
return c / 4;
}