83 lines
2.9 KiB
HLSL
83 lines
2.9 KiB
HLSL
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// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
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#ifndef TERRAIN_HEIGHTMAP_COMMON_CGINC_INCLUDED
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#define TERRAIN_HEIGHTMAP_COMMON_CGINC_INCLUDED
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struct Input
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{
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float4 tc;
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float4 vertex;
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#ifndef TERRAIN_BASE_PASS
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UNITY_FOG_COORDS(0) // needed because finalcolor oppresses fog code generation.
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#endif
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};
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#if defined(UNITY_INSTANCING_ENABLED) && !defined(SHADER_API_D3D11_9X)
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sampler2D _TerrainHeightmapTexture;
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sampler2D _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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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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#if defined(TERRAIN_BASE_PASS) && defined(UNITY_PASS_META)
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// When we render albedo for GI baking, we actually need to take the ST
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float4 _MainTex_ST;
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#endif
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void SplatmapVert(inout appdata_full v, out Input data)
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{
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UNITY_INITIALIZE_OUTPUT(Input, data);
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#if defined(UNITY_INSTANCING_ENABLED) && !defined(SHADER_API_D3D11_9X)
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float2 patchVertex = v.vertex.xy;
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float4 instanceData = UNITY_ACCESS_INSTANCED_PROP(Terrain, _TerrainPatchInstanceData);
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float4 uvscale = instanceData.z * _TerrainHeightmapRecipSize;
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float4 uvoffset = instanceData.xyxy * uvscale;
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uvoffset.xy += 0.5f * _TerrainHeightmapRecipSize.xy;
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float2 sampleCoords = (patchVertex.xy * uvscale.xy + uvoffset.xy);
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float hm = UnpackHeightmap(tex2Dlod(_TerrainHeightmapTexture, float4(sampleCoords, 0, 0)));
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v.vertex.xz = (patchVertex.xy + instanceData.xy) * _TerrainHeightmapScale.xz * instanceData.z; //(x + xBase) * hmScale.x * skipScale;
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v.vertex.y = hm * _TerrainHeightmapScale.y;
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v.vertex.w = 1.0f;
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v.texcoord.xy = (patchVertex.xy * uvscale.zw + uvoffset.zw);
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v.texcoord3 = v.texcoord2 = v.texcoord1 = v.texcoord;
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#ifdef TERRAIN_INSTANCED_PERPIXEL_NORMAL
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v.normal = float3(0, 1, 0); // TODO: reconstruct the tangent space in the pixel shader. Seems to be hard with surface shader especially when other attributes are packed together with tSpace.
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data.tc.zw = sampleCoords;
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#else
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float3 nor = tex2Dlod(_TerrainNormalmapTexture, float4(sampleCoords, 0, 0)).xyz;
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v.normal = 2.0f * nor - 1.0f;
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#endif
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#endif
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v.tangent.xyz = cross(v.normal, float3(0,0,1));
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v.tangent.w = -1;
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data.tc.xy = v.texcoord.xy;
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data.vertex = mul(unity_ObjectToWorld, v.vertex);
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#ifdef TERRAIN_BASE_PASS
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#ifdef UNITY_PASS_META
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data.tc.xy = TRANSFORM_TEX(v.texcoord.xy, _MainTex);
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#endif
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#else
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float4 pos = UnityObjectToClipPos(v.vertex);
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UNITY_TRANSFER_FOG(data, pos);
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#endif
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}
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#endif // TERRAIN_HEATMAP_COMMON_CGINC_INCLUDED
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