288 lines
10 KiB
HLSL
288 lines
10 KiB
HLSL
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TEXTURE2D_X_FLOAT(_DownsampledDepth);
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float4 _DownsampledDepth_TexelSize;
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half4 _OverlayShadowColor;
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struct VaryingsCross {
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float4 positionCS : SV_POSITION;
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float2 uv: TEXCOORD0;
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float2 dir : TEXCOORD1;
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UNITY_VERTEX_OUTPUT_STEREO
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};
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VaryingsCross VertBlur(AttributesSimple v) {
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VaryingsCross o;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
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o.positionCS = v.positionOS;
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o.positionCS.y *= _ProjectionParams.x;
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o.uv = v.uv;
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#if defined(BLUR_VERT)
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o.dir = float2(0, _MainTex_TexelSize.y * _BlurScale);
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#else
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o.dir = float2(_MainTex_TexelSize.x * _BlurScale, 0);
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#endif
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return o;
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}
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#if _BLUR_HQ
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static const float weights[] = { 0.14446445, 0.13543542, 0.11153505, 0.08055309, 0.05087564, 0.02798160, 0.01332457, 0.00545096 };
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#define SAMPLE_COUNT 7
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#else
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static const float weights[] = { 0.2270270270, 0.3162162162, 0.0702702703 };
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#define SAMPLE_COUNT 2
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#endif
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half2 BlurShadowGaussian(VaryingsCross i, float depth) {
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float2 uv = UnityStereoTransformScreenSpaceTex(i.uv);
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half2 shadow = SAMPLE_TEXTURE2D_X_LOD(_MainTex, sampler_LinearClamp, uv, 0).xy;
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if (depth > SHADOW_MAX_BLUR_DEPTH) return shadow;
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float referenceDepth = 10.0 / _ProjectionParams.z;
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float spread = BLUR_SPREAD * clamp(referenceDepth / depth, 1.0, 10.0);
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#if _CONTACT_HARDENING
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spread *= lerp(1, shadow.y, CONTACT_STRENGTH);
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#endif
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spread = clamp(spread, 0.5, 10);
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half2 shadowBlur = 0;
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half sum = 0.0000001;
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UNITY_UNROLL
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for (int index = -SAMPLE_COUNT; index <= SAMPLE_COUNT; index++) {
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float2 uv = i.uv + i.dir * (index * spread);
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float2 shadowN = SAMPLE_TEXTURE2D_X_LOD(_MainTex, sampler_LinearClamp, UnityStereoTransformScreenSpaceTex(uv), 0).xy;
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float depthN = GetLinearDepth(uv);
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float depthDiff = abs(depthN - depth);
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float r2 = depthDiff * DEPTH_REJECTION;
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float g = exp(-r2 * r2);
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float w = g * weights[abs(index)];
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shadowBlur += w * shadowN;
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sum += w;
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}
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shadowBlur /= sum;
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return shadowBlur;
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}
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half2 BlurShadowBox(VaryingsSimple i, float depth) {
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float2 uv = UnityStereoTransformScreenSpaceTex(i.uv);
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half2 shadow = SAMPLE_TEXTURE2D_X_LOD(_MainTex, sampler_LinearClamp, uv, 0).xy;
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if (depth > SHADOW_MAX_BLUR_DEPTH) return shadow;
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float referenceDepth = 10.0 / _ProjectionParams.z;
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float spread = BLUR_SPREAD * clamp(referenceDepth / depth, 1.0, 10.0);
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#if _CONTACT_HARDENING
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spread *= lerp(1, shadow.y, CONTACT_STRENGTH);
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#endif
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spread = clamp(spread, 1, 10);
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half2 shadowBlur = 0;
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half sum = 0.0000001;
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float2 blurSize = _MainTex_TexelSize.xy * spread;
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UNITY_UNROLL
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for(int y=-1;y<=1;y++) {
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UNITY_UNROLL
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for (int x = -1; x <= 1; x++) {
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float2 uv = i.uv + float2(x,y) * blurSize;
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float2 shadowN = SAMPLE_TEXTURE2D_X_LOD(_MainTex, sampler_LinearClamp, UnityStereoTransformScreenSpaceTex(uv), 0).xy;
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float depthN = GetLinearDepth(uv);
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float depthDiff = abs(depthN - depth);
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float r2 = depthDiff * DEPTH_REJECTION;
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float g = exp(-r2 * r2);
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float w = g;
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shadowBlur += w * shadowN;
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sum += w;
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}
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}
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shadowBlur /= sum;
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return shadowBlur;
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}
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half4 FragBlurGaussian (VaryingsCross i): SV_Target {
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
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float depth = GetLinearDepth(i.uv);
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if (depth >= SHADOW_MAX_DEPTH) return 1;
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half2 shadow = BlurShadowGaussian(i, depth);
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return half4(shadow, 0, 0);
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}
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half4 FragBlurBox (VaryingsSimple i): SV_Target {
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
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float depth = GetLinearDepth(i.uv);
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if (depth >= SHADOW_MAX_DEPTH) return 1;
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half2 shadow = BlurShadowBox(i, depth);
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return half4(shadow, 0, 0);
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}
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half4 FragCompose (VaryingsSimple i): SV_Target {
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
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float rawDepth = SampleSceneDepth(i.uv);
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float depthPersp = Linear01Depth(rawDepth, _ZBufferParams);
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float depthOrtho = rawDepth;
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#if UNITY_REVERSED_Z
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depthOrtho = 1.0 - depthOrtho;
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#endif
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float depth = lerp(depthPersp, depthOrtho, unity_OrthoParams.w);
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if (depth >= SHADOW_MAX_DEPTH) return 1;
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float2 uv = UnityStereoTransformScreenSpaceTex(i.uv);
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#if _PRESERVE_EDGES
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const float threshold = 0.00005;
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const float t = 0.5;
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float2 uv00 = UnityStereoTransformScreenSpaceTex(i.uv + _DownsampledDepth_TexelSize.xy * float2(-t, -t));
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float2 uv10 = UnityStereoTransformScreenSpaceTex(i.uv + _DownsampledDepth_TexelSize.xy * float2(t, -t));
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float2 uv01 = UnityStereoTransformScreenSpaceTex(i.uv + _DownsampledDepth_TexelSize.xy * float2(-t, t));
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float2 uv11 = UnityStereoTransformScreenSpaceTex(i.uv + _DownsampledDepth_TexelSize.xy * float2(t, t));
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float4 depths;
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depths.x = SAMPLE_TEXTURE2D_X(_DownsampledDepth, sampler_PointClamp, uv00).r;
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depths.y = SAMPLE_TEXTURE2D_X(_DownsampledDepth, sampler_PointClamp, uv10).r;
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depths.z = SAMPLE_TEXTURE2D_X(_DownsampledDepth, sampler_PointClamp, uv01).r;
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depths.w = SAMPLE_TEXTURE2D_X(_DownsampledDepth, sampler_PointClamp, uv11).r;
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float4 diffs = abs(depth.xxxx - depths);
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float2 minUV = UnityStereoTransformScreenSpaceTex(uv);
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if (any(diffs > threshold)) {
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// Check 10 vs 00
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float minDiff = lerp(diffs.x, diffs.y, diffs.y < diffs.x);
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minUV = lerp(uv00, uv10, diffs.y < diffs.x);
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// Check against 01
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minUV = lerp(minUV, uv01, diffs.z < minDiff);
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minDiff = lerp(minDiff, diffs.z, diffs.z < minDiff);
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// Check against 11
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minUV = lerp(minUV, uv11, diffs.w < minDiff);
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}
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half2 shadow = SAMPLE_TEXTURE2D_X(_MainTex, sampler_LinearClamp, minUV).xy;
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#else
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half2 shadow = SAMPLE_TEXTURE2D_X(_MainTex, sampler_LinearClamp, uv).xy;
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#endif
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// improve shadow edge
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#if _CONTACT_HARDENING
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half penumbra = lerp(1.0 - BLUR_EDGE_SHARPNESS, 1.0, shadow.y);
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#else
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half penumbra = 1.0 - BLUR_EDGE_SHARPNESS;
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#endif
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half u0 = 0.5 - penumbra * 0.5;
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half u1 = 0.5 + penumbra * 0.5;
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// lerp between fine and smooth edge based on distance to occluder
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half edged = smoothstep(u0, u1, shadow.x);
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shadow.x = lerp(shadow.x, edged, BLUR_EDGE_SHARPNESS);
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shadow = round(shadow * POSTERIZATION) / POSTERIZATION;
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half blendingFactor = 1.0;
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#if defined(COMPOSE_WITH_BLENDING)
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// reduce blur with distance
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blendingFactor -= saturate((depth - BLUR_DEPTH_ATTEN_START) / BLUR_DEPTH_ATTEN_LENGTH);
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// under skewed view, reduce blur
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if (BLUR_GRAZING_ATTEN_STRENGTH > 0) {
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float3 wpos = GetWorldPosition(uv, rawDepth);
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float3 viewDir = normalize(wpos - GetCameraPositionWS());
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#if _NORMALS_TEXTURE
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float3 norm = SampleSceneNormals(uv);
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#else
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float3 norm = GetNormalFromWPOS(wpos);
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#endif
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blendingFactor *= lerp(1, abs(dot(norm, viewDir)), BLUR_GRAZING_ATTEN_STRENGTH);
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}
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#endif
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return half4(shadow.x, 0, 0, blendingFactor);
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}
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float4 FragDownsampleDepth (VaryingsSimple i): SV_Target {
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
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float depth = GetLinearDepth(i.uv);
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if (depth >= SHADOW_MAX_DEPTH) return 1;
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return depth;
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}
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half4 FragComposeUnity (VaryingsSimple i): SV_Target {
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
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float rawDepth = SampleSceneDepth(i.uv);
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#if !_RECEIVER_PLANE
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if (IsSkyBox(rawDepth)) return 1;
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#endif
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float2 uv = UnityStereoTransformScreenSpaceTex(i.uv);
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#if _PRESERVE_EDGES
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float depth = Linear01Depth(rawDepth, _ZBufferParams);
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const float threshold = 0.00005;
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const float t = 0.5;
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float2 uv00 = UnityStereoTransformScreenSpaceTex(i.uv + _DownsampledDepth_TexelSize.xy * float2(-t, -t));
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float2 uv10 = UnityStereoTransformScreenSpaceTex(i.uv + _DownsampledDepth_TexelSize.xy * float2(t, -t));
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float2 uv01 = UnityStereoTransformScreenSpaceTex(i.uv + _DownsampledDepth_TexelSize.xy * float2(-t, t));
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float2 uv11 = UnityStereoTransformScreenSpaceTex(i.uv + _DownsampledDepth_TexelSize.xy * float2(t, t));
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float4 depths;
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depths.x = SAMPLE_TEXTURE2D_X(_DownsampledDepth, sampler_PointClamp, uv00).r;
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depths.y = SAMPLE_TEXTURE2D_X(_DownsampledDepth, sampler_PointClamp, uv10).r;
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depths.z = SAMPLE_TEXTURE2D_X(_DownsampledDepth, sampler_PointClamp, uv01).r;
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depths.w = SAMPLE_TEXTURE2D_X(_DownsampledDepth, sampler_PointClamp, uv11).r;
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float4 diffs = abs(depth.xxxx - depths);
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float2 minUV = UnityStereoTransformScreenSpaceTex(uv);
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if (any(diffs > threshold)) {
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// Check 10 vs 00
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float minDiff = lerp(diffs.x, diffs.y, diffs.y < diffs.x);
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minUV = lerp(uv00, uv10, diffs.y < diffs.x);
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// Check against 01
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minUV = lerp(minUV, uv01, diffs.z < minDiff);
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minDiff = lerp(minDiff, diffs.z, diffs.z < minDiff);
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// Check against 11
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minUV = lerp(minUV, uv11, diffs.w < minDiff);
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}
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half shadow = SAMPLE_TEXTURE2D_X(_MainTex, sampler_LinearClamp, minUV).x;
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#else
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half shadow = SAMPLE_TEXTURE2D_X(_MainTex, sampler_LinearClamp, uv).x;
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#endif
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return half4(shadow, 0, 0, 0);
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}
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half4 FragDebugShadows(Varyings input) : SV_Target {
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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float2 uv = UnityStereoTransformScreenSpaceTex(input.texcoord.xy);
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half shadow = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_LinearClamp, uv).x;
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return shadow.xxxx;
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}
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half4 FragOverlayShadows(Varyings input) : SV_Target {
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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float2 uv = UnityStereoTransformScreenSpaceTex(input.texcoord.xy);
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half shadow = SAMPLE_TEXTURE2D_X(_ScreenSpaceShadowmapTexture, sampler_LinearClamp, uv).x;
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return half4(1, 1, 1, 1 - shadow) * _OverlayShadowColor;
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}
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