Add shaders
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Williams
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#include "UnityCG.cginc"
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#define SNOW_TEXTURE_SCALE 0.1
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#define RELIEF_SAMPLE_COUNT 8
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#define RELIEF_BINARY_SAMPLE_COUNT 8
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#define RELIEF_MAX_RAY_LENGTH 0.5
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#define SNOW_NORMAL_THRESHOLD 0.6
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uniform sampler2D _MainTex;
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uniform sampler2D _GS_SnowTex;
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uniform sampler2D _GS_SnowNormalsTex;
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uniform sampler2D _GS_NoiseTex;
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uniform float4 _GS_SunDir; // w = terrain mark distance
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uniform float4 _GS_SnowData1; // x = relief, y = occlusion, z = glitter, w = brightness
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uniform float4 _GS_SnowData3; // x = Sun occlusion, y = sun atten, z = ground coverage, w = grass coverage
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uniform float _SnowCoverage, _Scatter, _SnowScale;
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uniform half3 _Color, _SnowTint;
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uniform float _SlopeThreshold, _SlopeNoise, _SlopeSharpness;
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#ifndef GLOBALSNOW_INPUT_STRUCTURE_INCLUDED
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#define GLOBALSNOW_INPUT_STRUCTURE_INCLUDED
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struct Input {
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float2 uv_MainTex;
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float3 wpos;
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#if GLOBALSNOW_FLAT_SHADING
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float3 worldNormal;
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#else
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float3 worldNormal; INTERNAL_DATA
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#endif
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};
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#endif
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// get snow coverage
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#if defined(GLOBALSNOW_IS_STANDARD_SHADER)
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void SetSnowCoverage(Input IN, inout SurfaceOutputStandard o)
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#elif defined(GLOBALSNOW_IS_NON_SURFACE_SHADER)
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void SetSnowCoverage(v2f IN, inout fixed4 finalColor)
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#else
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void SetSnowCoverage(Input IN, inout SurfaceOutput o)
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#endif
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{
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fixed snowCover = _SnowCoverage;
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float3 snowPos = IN.wpos;
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snowPos.xz *= _SnowScale;
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// diffuse
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#if GLOBALSNOW_FLAT_SHADING
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fixed4 diff = tex2D(_GS_SnowTex, snowPos.xz * 0.02);
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#else
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fixed4 diff = tex2D(_GS_SnowTex, snowPos.xz * 0.02).gggg;
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#endif
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// get world space normal
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#if GLOBALSNOW_FLAT_SHADING || defined(GLOBALSNOW_IS_NON_SURFACE_SHADER)
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float3 wsNormal = IN.worldNormal;
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#else
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float3 wsNormal = WorldNormalVector (IN, float3(0,0,1));
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#endif
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// prevent snow on walls and below minimum altitude
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float altG = tex2D(_GS_SnowTex, snowPos.xz * 0.5).g;
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float altNoise = diff.r * altG - 0.7;
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#if defined(GLOBALSNOW_IGNORE_SURFACE_NORMAL)
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float flatSurface = 1;
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#else
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#if !SHADER_API_D3D9 && defined(GLOBALSNOW_ENABLE_SLOPE_CONTROL)
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float ny = wsNormal.y - _SlopeThreshold;
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float flatSurface = saturate( (ny + (altNoise - 0.2) * _SlopeNoise) * (5.0 + _SlopeSharpness));
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#else
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float ny = wsNormal.y - 0.7;
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float flatSurface = saturate(ny * 15.0);
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#endif
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#endif
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float minAltitude = saturate( 1.0 - altNoise * _Scatter);
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snowCover *= minAltitude * flatSurface;
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if (snowCover <= 0) {
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#if !defined(GLOBALSNOW_IS_NON_SURFACE_SHADER) && !GLOBALSNOW_FLAT_SHADING
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o.Normal = float3(0,0,1);
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#endif
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return;
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}
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const float snowHeight = _GS_SnowData1.x; // Range: 0.001 .. 0.3 or will distort
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float3 rayDir = normalize(_WorldSpaceCameraPos - snowPos);
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// relief
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#if GLOBALSNOW_RELIEF || GLOBALSNOW_OCCLUSION
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float height = 0;
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if (snowCover > 0.1) {
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// 3D surface mapping
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rayDir.y = max(0.3, rayDir.y);
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snowPos.y = 0;
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float3 snowPos0 = snowPos + rayDir * RELIEF_MAX_RAY_LENGTH;
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float3 rayStep = (snowPos - snowPos0) / (float)RELIEF_SAMPLE_COUNT;
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// locate hit point
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UNITY_UNROLL
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for (int k=0;k<RELIEF_SAMPLE_COUNT;k++) {
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float h1 = tex2Dlod(_GS_NoiseTex, float4(snowPos0.xz * SNOW_TEXTURE_SCALE, 0, 0)).g * snowHeight; // use tex2Dlod to prevent artifacts due to quantization of step
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if (h1>snowPos0.y) {
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snowPos = snowPos0;
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snowPos0 -= rayStep;
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break;
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}
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snowPos0 += rayStep;
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}
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// binary search
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UNITY_UNROLL
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for (int j=0;j<RELIEF_BINARY_SAMPLE_COUNT;j++) {
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float3 occ = (snowPos0 + snowPos) * 0.5;
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height = tex2D(_GS_NoiseTex, occ.xz * SNOW_TEXTURE_SCALE).g; // don't use tex2Dlod to prevent occlusion artifacts - we need an average here
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if (height * snowHeight>occ.y) {
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snowPos = occ;
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} else {
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snowPos0 = occ;
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}
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}
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}
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#if GLOBALSNOW_OCCLUSION
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// fake occlusion (optional)
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float height2 = tex2D(_GS_NoiseTex, (snowPos.xz + normalize(_GS_SunDir.xz) * 0.03) * SNOW_TEXTURE_SCALE).g;
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diff.a = saturate(height-height2);
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#endif
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#endif // RELIEF
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// surface normal at point
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#if GLOBALSNOW_FLAT_SHADING
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float3 norm = float3(0,0,1);
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float3 norm1 = norm;
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#else
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float4 texNorm1 = tex2D(_GS_SnowNormalsTex, snowPos.xz * SNOW_TEXTURE_SCALE);
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float3 norm1 = UnpackNormal(texNorm1);
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// perturb normal (optional)
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float4 texNorm2 = tex2D(_GS_SnowNormalsTex, snowPos.xz * SNOW_TEXTURE_SCALE * 64.0);
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float3 norm2 = UnpackNormal(texNorm2);
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float3 norm = normalize(norm1 + norm2);
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// glitter (optional)
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float randomFacet = frac(norm.x * 173.13) - 0.99;
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float normalGloss = saturate(dot(-_GS_SunDir.xyz, norm));
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float glitter = saturate(randomFacet * 55.0) * normalGloss * _GS_SnowData1.z;
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#endif
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// pass color data to output shader
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fixed3 snowAlbedo;
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#if GLOBALSNOW_OCCLUSION
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snowAlbedo = (diff.rgb + glitter.xxx) * _GS_SnowData1.w * saturate (1.0 - diff.a * _GS_SnowData1.y);
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#elif GLOBALSNOW_FLAT_SHADING
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snowAlbedo = diff.rgb * _GS_SnowData1.w;
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#else
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snowAlbedo = (diff.rgb + glitter.xxx) * _GS_SnowData1.w;
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#endif
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snowAlbedo *= _SnowTint;
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#if defined(GLOBALSNOW_IS_NON_SURFACE_SHADER)
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finalColor.rgb = lerp(finalColor.rgb, snowAlbedo, snowCover);
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#else
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#if !defined(GLOBALSNOW_IS_STANDARD_SHADER)
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_SpecColor.rgb = diff.rgb * 0.025;
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o.Gloss = _GS_SnowData3.x * saturate(0.65 + _GS_SunDir.y);
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#endif
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o.Albedo = snowAlbedo;
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o.Alpha = snowCover;
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#if !GLOBALSNOW_FLAT_SHADING
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o.Normal = norm;
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#endif
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#endif
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}
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