61 lines
2.1 KiB
HLSL
61 lines
2.1 KiB
HLSL
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#ifndef VOLUMETRIC_FOG_2_POINT_LIGHTS
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#define VOLUMETRIC_FOG_2_POINT_LIGHTS
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#if VF2_POINT_LIGHTS
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//#define FAST_POINT_LIGHTS_OCCLUSION
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#define FOG_MAX_POINT_LIGHTS 16
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CBUFFER_START(VolumetricFog2PointLightBuffers)
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float4 _VF2_FogPointLightPosition[FOG_MAX_POINT_LIGHTS];
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half4 _VF2_PointLightColor[FOG_MAX_POINT_LIGHTS];
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float _VF2_PointLightInsideAtten;
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int _VF2_PointLightCount;
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CBUFFER_END
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#define dot2(x) dot(x,x)
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float minimum_distance_sqr(float fogLengthSqr, float3 w, float3 p) {
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// Return minimum distance between line segment vw and point p
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float t = saturate(dot(p, w) / fogLengthSqr);
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float3 projection = t * w;
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float distSqr = dot2(p - projection);
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return distSqr;
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}
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void AddPointLights(float3 rayStart, float3 rayDir, inout half4 sum, float t0, float fogLength) {
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float3 fogCeilingCut = rayStart + rayDir * t0;
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fogCeilingCut += rayDir * _VF2_PointLightInsideAtten;
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fogLength -= _VF2_PointLightInsideAtten;
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rayDir *= fogLength;
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float fogLengthSqr = fogLength * fogLength;
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for (int k=0;k<_VF2_PointLightCount;k++) {
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float3 pointLightPosition = _VF2_FogPointLightPosition[k].xyz;
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#if defined(FAST_POINT_LIGHTS_OCCLUSION)
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float4 clipPos = TransformWorldToHClip(pointLightPosition);
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float4 scrPos = ComputeScreenPos(clipPos);
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float depth = LinearEyeDepth(SampleSceneDepth(scrPos.xy / scrPos.w), _ZBufferParams);
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if (depth < clipPos.w) continue;
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#endif
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half pointLightInfluence = minimum_distance_sqr(fogLengthSqr, rayDir, pointLightPosition - fogCeilingCut) / _VF2_PointLightColor[k].w;
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half scattering = sum.a / (1.0 + pointLightInfluence);
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sum.rgb += _VF2_PointLightColor[k].rgb * scattering;
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}
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}
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half3 GetPointLights(float3 wpos) {
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half3 color = half3(0,0,0);
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for (int k=0;k<_VF2_PointLightCount;k++) {
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float3 toLight = _VF2_FogPointLightPosition[k].xyz - wpos;
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float dist = dot2(toLight);
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color += _VF2_PointLightColor[k].rgb * _VF2_PointLightColor[k].w / dist;
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}
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return color;
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}
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#endif // VF2_POINT_LIGHTS
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#endif // VOLUMETRIC_FOG_2_POINT_LIGHTS
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