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36 行
1.5 KiB
36 行
1.5 KiB
void MainLightBlurShadow_half(half rand, half fadeTightness, SamplerState pointClamp, half blurRadius, half3 worldPos, out half shadowAtten)
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{
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#if SHADERGRAPH_PREVIEW
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shadowAtten = 1;
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#else
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const int NUM_STEPS = 10;
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float oneDivNumSteps = 1.0 / NUM_STEPS;
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Light mainLight = GetMainLight();
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shadowAtten = 1;
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ShadowSamplingData shadowSamplingData = GetMainLightShadowSamplingData();
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for (int i = NUM_STEPS / 4; i < NUM_STEPS; i++)
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{
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//Instead of sampling the position of the current pixel, sample a point that's a i steps away, in a semi-randomized direction
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//the starting direction is randomized and then the direction is rotated by "i" radians every iteration
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half3 newWorldPos = worldPos + half3(sin(rand + i), 0, cos(rand + i)) * i * oneDivNumSteps * blurRadius;
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#if SHADOWS_SCREEN
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half4 clipPos = TransformWorldToHClip(newWorldPos);
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half4 shadowCoord = ComputeScreenPos(clipPos);
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#else
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half4 shadowCoord = TransformWorldToShadowCoord(newWorldPos);
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#endif
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#ifdef _MAIN_LIGHT_SHADOWS_CASCADE
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half cascadeIndex = ComputeCascadeIndex(newWorldPos);
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#else
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half cascadeIndex = 0;
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#endif
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float shadowMapSample = SAMPLE_TEXTURE2D_SHADOW(_MainLightShadowmapTexture, sampler_MainLightShadowmapTexture, shadowCoord.xyz);
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//0 or 1 depending on whether a shadow is being cast
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float isInShadow = step(shadowMapSample, shadowCoord.z);
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shadowAtten -= isInShadow * oneDivNumSteps;
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// If the position is out of shadow distance, just return 1
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shadowAtten = BEYOND_SHADOW_FAR(shadowCoord) ? 1.0 : saturate(shadowAtten);
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}
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#endif
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}
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