50 lines
1.6 KiB
HLSL
50 lines
1.6 KiB
HLSL
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#ifndef CHARACTER_SHADOW_TRANSFORMS_INCLUDED
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#define CHARACTER_SHADOW_TRANSFORMS_INCLUDED
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#include "./CharacterShadowInput.hlsl"
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float3 ApplyCharShadowBias(float3 positionWS, float3 normalWS, float3 lightDirection, float depthBias, float normalBias)
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{
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// Depth Bias
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positionWS = lightDirection * depthBias + positionWS;
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// Normal Bias
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float invNdotL = 1.0 - saturate(dot(lightDirection, normalWS));
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float scale = invNdotL * -normalBias;
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positionWS = normalWS * scale.xxx + positionWS;
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return positionWS;
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}
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float4 CharShadowWorldToHClipWithoutBias(float3 positionWS)
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{
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return mul(_CharShadowViewProjM, float4(positionWS, 1.0));
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}
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float4 CharShadowObjectToHClip(float3 positionOS, float3 normalWS, float depthBias, float normalBias)
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{
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float3 positionWS = TransformObjectToWorld(positionOS);
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positionWS = ApplyCharShadowBias(positionWS, normalWS, _BrightestLightDirection.xyz, _CharShadowBias.x + depthBias, _CharShadowBias.y + normalBias);
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return CharShadowWorldToHClipWithoutBias(positionWS);
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}
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float4 CharShadowObjectToHClipWithoutBias(float3 positionOS)
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{
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float3 positionWS = TransformObjectToWorld(positionOS);
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return CharShadowWorldToHClipWithoutBias(positionWS);
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}
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// Skip if too far (since we don't use mipmap for charshadowmap, manually cull this calculation based on view depth.)
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bool IfCharShadowCulled(float viewPosZ)
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{
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return viewPosZ < _CharShadowCullingDist;
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}
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float GetCharShadowFade(float viewPosZ)
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{
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const float fadeStart = _CharShadowCullingDist * 0.9;
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const float div = _CharShadowCullingDist * 0.1;
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return saturate((viewPosZ - fadeStart) / div);
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}
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#endif
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