81 lines
2.6 KiB
HLSL
81 lines
2.6 KiB
HLSL
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#ifndef CONDITIONAL_PAINTING_INCLUDED
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#define CONDITIONAL_PAINTING_INCLUDED
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#include "PaintToolCommon.cginc"
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//Include these lines in the main shader Pass code
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//#pragma shader_feature BLEND_HEIGHT
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//#pragma shader_feature BLEND_SLOPE
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//#pragma shader_feature BLEND_NOISE
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float _MinHeight;
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float _MaxHeight;
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sampler2D _HeightTransition;
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float _MinSlope;
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float _MaxSlope;
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sampler2D _SlopeTransition;
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float4 _NoiseOrigin;
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float _NoiseFrequency;
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int _NoiseOctaves;
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float _NoiseLacunarity;
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float _NoisePersistence;
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sampler2D _NoiseRemap;
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sampler2D _HeightMap;
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sampler2D _NormalMap;
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float4 _TerrainDimension;
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float ComputeRuleMask(float2 terrainUV)
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{
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float blendHeightValue = 1;
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float4 heightMapColor = tex2D(_HeightMap, terrainUV);
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float height = GriffinDecodeFloatRG(heightMapColor.rg);
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#if BLEND_HEIGHT
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float heightTransitionFactor = (height - _MinHeight) / (_MaxHeight - _MinHeight);
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float heightTransition = tex2D(_HeightTransition, float2(heightTransitionFactor, 0.5)).r;
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blendHeightValue = (height >= _MinHeight) * (height <= _MaxHeight) * heightTransition;
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#endif
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float blendSlopeValue = 1;
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#if BLEND_SLOPE
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float4 normalMapColor = tex2D(_NormalMap, terrainUV);
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float3 normalVector = normalMapColor * 2 - float3(1, 1, 1);
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float cosine = abs(normalVector.y);
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float slopeAngle = acos(cosine);
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float slopeTransitionFactor = (slopeAngle - _MinSlope) / (_MaxSlope - _MinSlope);
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float slopeTransition = tex2D(_SlopeTransition, float2(slopeTransitionFactor, 0.5f)).r;
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blendSlopeValue = (slopeAngle >= _MinSlope) * (slopeAngle <= _MaxSlope) * slopeTransition;
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#endif
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float blendNoiseValue = 1;
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#if BLEND_NOISE
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float2 refSize = float2(1, 1);
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float noiseValue = 0;
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float frequency = _NoiseFrequency;
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float amplitude = 1;
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float2 noisePos;
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float2 uv;
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float sampledNoise;
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float2 worldXZ = float2(_TerrainDimension.x + terrainUV.x * _TerrainDimension.z, _TerrainDimension.y + terrainUV.y * _TerrainDimension.w)/1000;
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for (int octave = 0; octave < 4; ++octave)
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{
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frequency = frequency * pow(_NoiseLacunarity, octave);
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amplitude = amplitude * pow(_NoisePersistence, octave);
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noisePos = _NoiseOrigin.xy + worldXZ * frequency;
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uv = float2(noisePos.x / refSize.x, noisePos.y / refSize.y);
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sampledNoise = GradientNoise(uv) * amplitude * (octave < _NoiseOctaves);
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noiseValue += sampledNoise;
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}
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float remapFactor = noiseValue * 0.5 + 0.5;
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blendNoiseValue = tex2D(_NoiseRemap, float2(remapFactor, 0.5)).a;
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#endif
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float result = blendHeightValue * blendSlopeValue * blendNoiseValue;
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return result;
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}
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#endif // CONDITIONAL_PAINTING_INCLUDED
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