37 lines
1.5 KiB
HLSL
37 lines
1.5 KiB
HLSL
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#ifndef FAKE_SHADOWS_INCLUDED
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#define FAKE_SHADOWS_INCLUDED
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half4 _FakeShadowsLights[4];
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const half epsilon = 0.0001;
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// half4 player(pos.xyz, radius)
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half CalcFakeShadowPerLight(half4 light, half3 playerPos, half playerRad, half3 posToPlayer, half3 posWS)
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{
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// Calc dot
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half3 playerToLight = normalize(light.xyz - playerPos);
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half d = dot(posToPlayer, playerToLight);
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float r = 1 - playerRad;
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d = saturate((d - r) / (1 - r)); // remap range: r~1 -> 0~1
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// Attenuation
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half distLightToPos = distance(posWS, light.xyz);
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half atten = 1 - saturate(distLightToPos / (light.w + epsilon)); // Apply light radius
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atten = atten * atten; // Inverse Square Law
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// Adjust attenuation and reverse
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return 1 - saturate(d * atten);
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}
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// shadowArgs: (x)radius, (y)strength
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void FakeShadows_float(in half3 playerPosition, in half4 shadowArgs, in half3 positionWS, out half shadows)
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{
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half3 posToPlayer = normalize(playerPosition - positionWS);
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shadows = CalcFakeShadowPerLight(_FakeShadowsLights[0], playerPosition, shadowArgs[0], posToPlayer, positionWS);
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shadows *= CalcFakeShadowPerLight(_FakeShadowsLights[1], playerPosition, shadowArgs[0], posToPlayer, positionWS);
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shadows *= CalcFakeShadowPerLight(_FakeShadowsLights[2], playerPosition, shadowArgs[0], posToPlayer, positionWS);
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shadows *= CalcFakeShadowPerLight(_FakeShadowsLights[3], playerPosition, shadowArgs[0], posToPlayer, positionWS);
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shadows = shadows * shadows * shadows; // enhance shadows
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shadows = saturate(shadows + (1 - shadowArgs[1]));
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}
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#endif
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