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280 行
6.4 KiB
280 行
6.4 KiB
Shader "Hidden/SSAO" {
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Properties {
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_MainTex ("", 2D) = "" {}
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_RandomTexture ("", 2D) = "" {}
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_SSAO ("", 2D) = "" {}
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}
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Subshader {
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ZTest Always Cull Off ZWrite Off
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CGINCLUDE
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// Common code used by several SSAO passes below
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#include "UnityCG.cginc"
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#pragma exclude_renderers gles
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struct v2f_ao {
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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float2 uvr : TEXCOORD1;
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};
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uniform float2 _NoiseScale;
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float4 _CameraDepthNormalsTexture_ST;
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v2f_ao vert_ao (appdata_img v)
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{
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v2f_ao o;
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o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
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o.uv = TRANSFORM_TEX(v.texcoord, _CameraDepthNormalsTexture);
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o.uvr = v.texcoord.xy * _NoiseScale;
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return o;
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}
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sampler2D _CameraDepthNormalsTexture;
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sampler2D _RandomTexture;
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float4 _Params; // x=radius, y=minz, z=attenuation power, w=SSAO power
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// HLSL and GLSL do not support arbitrarily sized arrays as function parameters (eg. float bla[]), whereas Cg does.
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#if !defined(UNITY_COMPILER_CG)
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# define INPUT_SAMPLE_COUNT 8
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# include "frag_ao.cginc"
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# undef INPUT_SAMPLE_COUNT
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# define INPUT_SAMPLE_COUNT 14
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# include "frag_ao.cginc"
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# undef INPUT_SAMPLE_COUNT
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# define INPUT_SAMPLE_COUNT 26
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# include "frag_ao.cginc"
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# undef INPUT_SAMPLE_COUNT
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# define INPUT_SAMPLE_COUNT 34
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# include "frag_ao.cginc"
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# undef INPUT_SAMPLE_COUNT
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#else
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# define INPUT_SAMPLE_COUNT
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# include "frag_ao.cginc"
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#endif
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ENDCG
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// ---- SSAO pass, 8 samples
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Pass {
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CGPROGRAM
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#pragma vertex vert_ao
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#pragma fragment frag
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#pragma target 3.0
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half4 frag (v2f_ao i) : SV_Target
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{
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#define SAMPLE_COUNT 8
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const float3 RAND_SAMPLES[SAMPLE_COUNT] = {
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float3(0.01305719,0.5872321,-0.119337),
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float3(0.3230782,0.02207272,-0.4188725),
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float3(-0.310725,-0.191367,0.05613686),
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float3(-0.4796457,0.09398766,-0.5802653),
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float3(0.1399992,-0.3357702,0.5596789),
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float3(-0.2484578,0.2555322,0.3489439),
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float3(0.1871898,-0.702764,-0.2317479),
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float3(0.8849149,0.2842076,0.368524),
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};
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return frag_ao (i, SAMPLE_COUNT, RAND_SAMPLES);
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}
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ENDCG
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}
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// ---- SSAO pass, 14 samples
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Pass {
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CGPROGRAM
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#pragma vertex vert_ao
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#pragma fragment frag
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#pragma target 3.0
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half4 frag (v2f_ao i) : SV_Target
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{
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#define SAMPLE_COUNT 14
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const float3 RAND_SAMPLES[SAMPLE_COUNT] = {
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float3(0.4010039,0.8899381,-0.01751772),
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float3(0.1617837,0.1338552,-0.3530486),
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float3(-0.2305296,-0.1900085,0.5025396),
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float3(-0.6256684,0.1241661,0.1163932),
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float3(0.3820786,-0.3241398,0.4112825),
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float3(-0.08829653,0.1649759,0.1395879),
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float3(0.1891677,-0.1283755,-0.09873557),
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float3(0.1986142,0.1767239,0.4380491),
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float3(-0.3294966,0.02684341,-0.4021836),
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float3(-0.01956503,-0.3108062,-0.410663),
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float3(-0.3215499,0.6832048,-0.3433446),
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float3(0.7026125,0.1648249,0.02250625),
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float3(0.03704464,-0.939131,0.1358765),
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float3(-0.6984446,-0.6003422,-0.04016943),
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};
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return frag_ao (i, SAMPLE_COUNT, RAND_SAMPLES);
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}
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ENDCG
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}
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// ---- SSAO pass, 26 samples
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Pass {
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CGPROGRAM
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#pragma vertex vert_ao
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#pragma fragment frag
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#pragma target 3.0
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half4 frag (v2f_ao i) : SV_Target
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{
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#define SAMPLE_COUNT 26
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const float3 RAND_SAMPLES[SAMPLE_COUNT] = {
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float3(0.2196607,0.9032637,0.2254677),
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float3(0.05916681,0.2201506,-0.1430302),
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float3(-0.4152246,0.1320857,0.7036734),
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float3(-0.3790807,0.1454145,0.100605),
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float3(0.3149606,-0.1294581,0.7044517),
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float3(-0.1108412,0.2162839,0.1336278),
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float3(0.658012,-0.4395972,-0.2919373),
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float3(0.5377914,0.3112189,0.426864),
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float3(-0.2752537,0.07625949,-0.1273409),
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float3(-0.1915639,-0.4973421,-0.3129629),
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float3(-0.2634767,0.5277923,-0.1107446),
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float3(0.8242752,0.02434147,0.06049098),
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float3(0.06262707,-0.2128643,-0.03671562),
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float3(-0.1795662,-0.3543862,0.07924347),
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float3(0.06039629,0.24629,0.4501176),
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float3(-0.7786345,-0.3814852,-0.2391262),
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float3(0.2792919,0.2487278,-0.05185341),
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float3(0.1841383,0.1696993,-0.8936281),
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float3(-0.3479781,0.4725766,-0.719685),
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float3(-0.1365018,-0.2513416,0.470937),
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float3(0.1280388,-0.563242,0.3419276),
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float3(-0.4800232,-0.1899473,0.2398808),
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float3(0.6389147,0.1191014,-0.5271206),
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float3(0.1932822,-0.3692099,-0.6060588),
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float3(-0.3465451,-0.1654651,-0.6746758),
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float3(0.2448421,-0.1610962,0.1289366),
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};
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return frag_ao (i, SAMPLE_COUNT, RAND_SAMPLES);
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}
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ENDCG
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}
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// ---- Blur pass
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Pass {
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma target 3.0
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#include "UnityCG.cginc"
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struct v2f {
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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};
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float4 _MainTex_ST;
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v2f vert (appdata_img v)
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{
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v2f o;
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o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
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o.uv = TRANSFORM_TEX (v.texcoord, _CameraDepthNormalsTexture);
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return o;
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}
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sampler2D _SSAO;
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float3 _TexelOffsetScale;
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inline half CheckSame (half4 n, half4 nn)
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{
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// difference in normals
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half2 diff = abs(n.xy - nn.xy);
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half sn = (diff.x + diff.y) < 0.1;
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// difference in depth
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float z = DecodeFloatRG (n.zw);
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float zz = DecodeFloatRG (nn.zw);
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float zdiff = abs(z-zz) * _ProjectionParams.z;
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half sz = zdiff < 0.2;
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return sn * sz;
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}
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half4 frag( v2f i ) : SV_Target
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{
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#define NUM_BLUR_SAMPLES 4
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float2 o = _TexelOffsetScale.xy;
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half sum = tex2D(_SSAO, i.uv).r * (NUM_BLUR_SAMPLES + 1);
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half denom = NUM_BLUR_SAMPLES + 1;
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half4 geom = tex2D (_CameraDepthNormalsTexture, i.uv);
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for (int s = 0; s < NUM_BLUR_SAMPLES; ++s)
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{
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float2 nuv = i.uv + o * (s+1);
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half4 ngeom = tex2D (_CameraDepthNormalsTexture, nuv.xy);
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half coef = (NUM_BLUR_SAMPLES - s) * CheckSame (geom, ngeom);
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sum += tex2D (_SSAO, nuv.xy).r * coef;
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denom += coef;
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}
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for (int s = 0; s < NUM_BLUR_SAMPLES; ++s)
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{
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float2 nuv = i.uv - o * (s+1);
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half4 ngeom = tex2D (_CameraDepthNormalsTexture, nuv.xy);
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half coef = (NUM_BLUR_SAMPLES - s) * CheckSame (geom, ngeom);
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sum += tex2D (_SSAO, nuv.xy).r * coef;
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denom += coef;
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}
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return sum / denom;
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}
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ENDCG
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}
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// ---- Composite pass
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Pass {
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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struct v2f {
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float4 pos : SV_POSITION;
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float2 uv[2] : TEXCOORD0;
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};
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v2f vert (appdata_img v)
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{
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v2f o;
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o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
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o.uv[0] = MultiplyUV (UNITY_MATRIX_TEXTURE0, v.texcoord);
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o.uv[1] = MultiplyUV (UNITY_MATRIX_TEXTURE1, v.texcoord);
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return o;
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}
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sampler2D _MainTex;
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sampler2D _SSAO;
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half4 frag( v2f i ) : SV_Target
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{
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half4 c = tex2D (_MainTex, i.uv[0]);
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half ao = tex2D (_SSAO, i.uv[1]).r;
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ao = pow (ao, _Params.w);
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c.rgb *= ao;
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return c;
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}
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ENDCG
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}
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}
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Fallback off
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}
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