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55 行
2.0 KiB
55 行
2.0 KiB
#ifdef UNITY_INSTANCING_ENABLED
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TEXTURE2D(_TerrainHeightmapTexture);
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TEXTURE2D(_TerrainNormalmapTexture);
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float4 _TerrainHeightmapRecipSize; // float4(1.0f/width, 1.0f/height, 1.0f/(width-1), 1.0f/(height-1))
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float4 _TerrainHeightmapScale; // float4(hmScale.x, hmScale.y / (float)(kMaxHeight), hmScale.z, 0.0f)
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#endif
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#define API_HAS_GURANTEED_R16_SUPPORT 0 //!(SHADER_API_VULKAN)
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float UnpackHeightmap(float4 height)
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{
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#if (API_HAS_GURANTEED_R16_SUPPORT)
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return height.r;
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#else
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return (height.r + height.g * 256.0f) / 257.0f; // (255.0f * height.r + 255.0f * 256.0f * height.g) / 65535.0f
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#endif
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}
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UNITY_INSTANCING_BUFFER_START(Terrain)
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UNITY_DEFINE_INSTANCED_PROP(float4, _TerrainPatchInstanceData) // float4(xBase, yBase, skipScale, ~)
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UNITY_INSTANCING_BUFFER_END(Terrain)
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void ApplyPreVertexModification(inout AttributesMesh input)
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{
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#ifdef UNITY_INSTANCING_ENABLED
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float2 patchVertex = input.positionOS.xy;
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float4 instanceData = UNITY_ACCESS_INSTANCED_PROP(Terrain, _TerrainPatchInstanceData);
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float2 sampleCoords = (patchVertex.xy + instanceData.xy) * instanceData.z; // (xy + float2(xBase,yBase)) * skipScale
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float height = UnpackHeightmap(_TerrainHeightmapTexture.Load(int3(sampleCoords, 0)));
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input.positionOS.xz = sampleCoords * _TerrainHeightmapScale.xz;
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input.positionOS.y = height * _TerrainHeightmapScale.y;
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#ifdef ATTRIBUTES_NEED_NORMAL
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input.normalOS = _TerrainNormalmapTexture.Load(int3(sampleCoords, 0)).rgb * 2 - 1;
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#endif
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#if defined(VARYINGS_NEED_TEXCOORD0) || defined(VARYINGS_DS_NEED_TEXCOORD0)
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#ifdef ENABLE_TERRAIN_PERPIXEL_NORMAL
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input.uv0 = sampleCoords;
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#else
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input.uv0 = sampleCoords * _TerrainHeightmapRecipSize.zw;
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#endif
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#endif
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#endif
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#ifdef ATTRIBUTES_NEED_TANGENT
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input.tangentOS.xyz = cross(float3(0,0,1), input.normalOS);
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input.tangentOS.w = 1;
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#endif
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}
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void ApplyVertexModification(AttributesMesh input, float3 normalWS, inout float3 positionWS, float4 time)
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{
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}
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