mirror of
https://github.com/FriendshipIsEpic/FiE-Game.git
synced 2024-11-30 00:48:00 +01:00
48 lines
1.6 KiB
HLSL
48 lines
1.6 KiB
HLSL
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half frag_ao (v2f_ao i, int sampleCount, float3 samples[INPUT_SAMPLE_COUNT])
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{
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// read random normal from noise texture
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half3 randN = tex2D (_RandomTexture, i.uvr).xyz * 2.0 - 1.0;
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// read scene depth/normal
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float4 depthnormal = tex2D (_CameraDepthNormalsTexture, i.uv);
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float3 viewNorm;
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float depth;
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DecodeDepthNormal (depthnormal, depth, viewNorm);
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depth *= _ProjectionParams.z;
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float scale = _Params.x / depth;
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// accumulated occlusion factor
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float occ = 0.0;
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for (int s = 0; s < sampleCount; ++s)
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{
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// Reflect sample direction around a random vector
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half3 randomDir = reflect(samples[s], randN);
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// Make it point to the upper hemisphere
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half flip = (dot(viewNorm,randomDir)<0) ? 1.0 : -1.0;
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randomDir *= -flip;
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// Add a bit of normal to reduce self shadowing
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randomDir += viewNorm * 0.3;
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float2 offset = randomDir.xy * scale;
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float sD = depth - (randomDir.z * _Params.x);
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// Sample depth at offset location
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float4 sampleND = tex2D (_CameraDepthNormalsTexture, i.uv + offset);
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float sampleD;
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float3 sampleN;
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DecodeDepthNormal (sampleND, sampleD, sampleN);
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sampleD *= _ProjectionParams.z;
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float zd = saturate(sD-sampleD);
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if (zd > _Params.y) {
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// This sample occludes, contribute to occlusion
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occ += pow(1-zd,_Params.z); // sc2
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//occ += 1.0-saturate(pow(1.0 - zd, 11.0) + zd); // nullsq
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//occ += 1.0/(1.0+zd*zd*10); // iq
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}
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}
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occ /= sampleCount;
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return 1-occ;
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}
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