27 lines
999 B
HLSL
27 lines
999 B
HLSL
TEXTURE2D_SHADOW(_DirectionalShadowAtlas);
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#define SHADOW_SAMPLER sampler_linear_clamp_compare
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SAMPLER_CMP(SHADOW_SAMPLER);
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half GetShadowAttenuation(half3 RayPos)
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{
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half4 shadowPos = TransformWorldToShadowCoord(RayPos);
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half4 shadowParams = GetMainLightShadowParams();
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float shadowStrength = shadowParams.x;
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float attenuation = _MainLightShadowmapTexture.SampleCmpLevelZero(SHADOW_SAMPLER, shadowPos.xy, shadowPos.z);
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return saturate(lerp(BEYOND_SHADOW_FAR(shadowPos) ? 1.0 : attenuation, 1.0, GetMainLightShadowFade(RayPos)));
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}
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float Raymarching( inout float3 position, float3 direction, int maxSteps, float stepSize, float depth, float sensitivity, float densityMultiplier, out float density )
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{
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density = 0;
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float shadowAtten = 0;
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for (int i = 0; i < maxSteps; i++) {
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if (density + stepSize < depth) {
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position+=direction*stepSize;
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density += stepSize;
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shadowAtten += GetShadowAttenuation(position) * sensitivity;
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} else
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return shadowAtten;
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}
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return shadowAtten;
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} |