235 lines
9.4 KiB
HLSL
235 lines
9.4 KiB
HLSL
#ifndef TERRAIN_SPLATMAP_COMMON_CGINC_INCLUDED
|
|
#define TERRAIN_SPLATMAP_COMMON_CGINC_INCLUDED
|
|
|
|
// Since 2018.3 we changed from _TERRAIN_NORMAL_MAP to _NORMALMAP to save 1 keyword.
|
|
// Since 2019.2 terrain keywords are changed to local keywords so it doesn't really matter. You can use both.
|
|
#if defined(_NORMALMAP) && !defined(_TERRAIN_NORMAL_MAP)
|
|
#define _TERRAIN_NORMAL_MAP
|
|
#elif !defined(_NORMALMAP) && defined(_TERRAIN_NORMAL_MAP)
|
|
#define _NORMALMAP
|
|
#endif
|
|
|
|
#if defined(SHADER_API_GLCORE) || defined(SHADER_API_GLES3) || defined(SHADER_API_GLES)
|
|
// GL doesn't support sperating the samplers from the texture object
|
|
#undef TERRAIN_USE_SEPARATE_VERTEX_SAMPLER
|
|
#else
|
|
#define TERRAIN_USE_SEPARATE_VERTEX_SAMPLER
|
|
#endif
|
|
|
|
struct Input
|
|
{
|
|
float4 tc;
|
|
#ifndef TERRAIN_BASE_PASS
|
|
UNITY_FOG_COORDS(0) // needed because finalcolor oppresses fog code generation.
|
|
#endif
|
|
};
|
|
|
|
sampler2D _Control;
|
|
float4 _Control_ST;
|
|
float4 _Control_TexelSize;
|
|
sampler2D _Splat0, _Splat1, _Splat2, _Splat3;
|
|
float4 _Splat0_ST, _Splat1_ST, _Splat2_ST, _Splat3_ST;
|
|
float4 _OffsetSize;
|
|
|
|
#if defined(UNITY_INSTANCING_ENABLED) && !defined(SHADER_API_D3D11_9X)
|
|
// Some drivers have undefined behaviors when samplers are used from the vertex shader
|
|
// with anisotropic filtering enabled. This causes some artifacts on some devices. To be
|
|
// sure to avoid this we use the vertex_linear_clamp_sampler sampler to sample terrain
|
|
// maps from the VS when we can.
|
|
#if defined(TERRAIN_USE_SEPARATE_VERTEX_SAMPLER)
|
|
UNITY_DECLARE_TEX2D(_TerrainHeightmapTexture);
|
|
UNITY_DECLARE_TEX2D(_TerrainNormalmapTexture);
|
|
SamplerState sampler__TerrainNormalmapTexture;
|
|
SamplerState vertex_linear_clamp_sampler;
|
|
#else
|
|
sampler2D _TerrainHeightmapTexture;
|
|
sampler2D _TerrainNormalmapTexture;
|
|
#endif
|
|
|
|
float4 _TerrainHeightmapRecipSize; // float4(1.0f/width, 1.0f/height, 1.0f/(width-1), 1.0f/(height-1))
|
|
float4 _TerrainHeightmapScale; // float4(hmScale.x, hmScale.y / (float)(kMaxHeight), hmScale.z, 0.0f)
|
|
#endif
|
|
|
|
UNITY_INSTANCING_BUFFER_START(Terrain)
|
|
UNITY_DEFINE_INSTANCED_PROP(float4, _TerrainPatchInstanceData) // float4(xBase, yBase, skipScale, ~)
|
|
UNITY_INSTANCING_BUFFER_END(Terrain)
|
|
|
|
#ifdef _NORMALMAP
|
|
sampler2D _Normal0, _Normal1, _Normal2, _Normal3;
|
|
float _NormalScale0, _NormalScale1, _NormalScale2, _NormalScale3;
|
|
#endif
|
|
|
|
#ifdef _ALPHATEST_ON
|
|
sampler2D _TerrainHolesTexture;
|
|
|
|
void ClipHoles(float2 uv)
|
|
{
|
|
float hole = tex2D(_TerrainHolesTexture, uv).r;
|
|
clip(hole == 0.0f ? -1 : 1);
|
|
}
|
|
#endif
|
|
|
|
#if defined(TERRAIN_BASE_PASS) && defined(UNITY_PASS_META)
|
|
// When we render albedo for GI baking, we actually need to take the ST
|
|
float4 _MainTex_ST;
|
|
#endif
|
|
|
|
void SplatmapVert(inout appdata_full v, out Input data)
|
|
{
|
|
UNITY_INITIALIZE_OUTPUT(Input, data);
|
|
|
|
#if defined(UNITY_INSTANCING_ENABLED) && !defined(SHADER_API_D3D11_9X)
|
|
|
|
float2 patchVertex = v.vertex.xy;
|
|
float4 instanceData = UNITY_ACCESS_INSTANCED_PROP(Terrain, _TerrainPatchInstanceData);
|
|
|
|
float4 uvscale = instanceData.z * _TerrainHeightmapRecipSize;
|
|
float4 uvoffset = instanceData.xyxy * uvscale;
|
|
uvoffset.xy += 0.5f * _TerrainHeightmapRecipSize.xy;
|
|
float2 sampleCoords = (patchVertex.xy * uvscale.xy + uvoffset.xy);
|
|
|
|
#if defined(TERRAIN_USE_SEPARATE_VERTEX_SAMPLER)
|
|
float hm = UnpackHeightmap(_TerrainHeightmapTexture.SampleLevel(vertex_linear_clamp_sampler, sampleCoords, 0));
|
|
#else
|
|
float hm = UnpackHeightmap(tex2Dlod(_TerrainHeightmapTexture, float4(sampleCoords, 0, 0)));
|
|
#endif
|
|
|
|
v.vertex.xz = (patchVertex.xy + instanceData.xy) * _TerrainHeightmapScale.xz * instanceData.z; //(x + xBase) * hmScale.x * skipScale;
|
|
v.vertex.y = hm * _TerrainHeightmapScale.y;
|
|
v.vertex.w = 1.0f;
|
|
|
|
v.texcoord.xy = (patchVertex.xy * uvscale.zw + uvoffset.zw);
|
|
v.texcoord3 = v.texcoord2 = v.texcoord1 = v.texcoord;
|
|
|
|
#ifdef TERRAIN_INSTANCED_PERPIXEL_NORMAL
|
|
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.
|
|
data.tc.zw = sampleCoords;
|
|
#else
|
|
#if defined(TERRAIN_USE_SEPARATE_VERTEX_SAMPLER)
|
|
float3 nor = _TerrainNormalmapTexture.SampleLevel(vertex_linear_clamp_sampler, sampleCoords, 0).xyz;
|
|
#else
|
|
float3 nor = tex2Dlod(_TerrainNormalmapTexture, float4(sampleCoords, 0, 0)).xyz;
|
|
#endif
|
|
v.normal = 2.0f * nor - 1.0f;
|
|
#endif
|
|
#endif
|
|
|
|
v.tangent.xyz = cross(v.normal, float3(0,0,1));
|
|
v.tangent.w = -1;
|
|
|
|
data.tc.xy = v.texcoord.xy;
|
|
#ifdef TERRAIN_BASE_PASS
|
|
#ifdef UNITY_PASS_META
|
|
data.tc.xy = TRANSFORM_TEX(v.texcoord.xy, _MainTex);
|
|
#endif
|
|
#else
|
|
float4 pos = UnityObjectToClipPos(v.vertex);
|
|
UNITY_TRANSFER_FOG(data, pos);
|
|
#endif
|
|
}
|
|
|
|
#ifndef TERRAIN_BASE_PASS
|
|
|
|
#ifdef TERRAIN_STANDARD_SHADER
|
|
void SplatmapMix(Input IN, half4 defaultAlpha, out half4 splat_control, out half weight, out fixed4 mixedDiffuse, inout fixed3 mixedNormal)
|
|
#else
|
|
void SplatmapMix(Input IN, out half4 splat_control, out half weight, out fixed4 mixedDiffuse, inout fixed3 mixedNormal)
|
|
#endif
|
|
{
|
|
#ifdef _ALPHATEST_ON
|
|
ClipHoles(IN.tc.xy);
|
|
#endif
|
|
|
|
// adjust splatUVs so the edges of the terrain tile lie on pixel centers
|
|
float2 splatUV = (IN.tc.xy * (_Control_TexelSize.zw - 1.0f) + 0.5f) * _Control_TexelSize.xy;
|
|
splat_control = tex2D(_Control, splatUV);
|
|
weight = dot(splat_control, half4(1,1,1,1));
|
|
|
|
IN.tc.xy = IN.tc.xy * _OffsetSize.zw + _OffsetSize.xy;
|
|
|
|
#if !defined(SHADER_API_MOBILE) && defined(TERRAIN_SPLAT_ADDPASS)
|
|
clip(weight == 0.0f ? -1 : 1);
|
|
#endif
|
|
|
|
// Normalize weights before lighting and restore weights in final modifier functions so that the overal
|
|
// lighting result can be correctly weighted.
|
|
splat_control /= (weight + 1e-3f);
|
|
|
|
float2 uvSplat0 = TRANSFORM_TEX(IN.tc.xy, _Splat0);
|
|
float2 uvSplat1 = TRANSFORM_TEX(IN.tc.xy, _Splat1);
|
|
float2 uvSplat2 = TRANSFORM_TEX(IN.tc.xy, _Splat2);
|
|
float2 uvSplat3 = TRANSFORM_TEX(IN.tc.xy, _Splat3);
|
|
|
|
mixedDiffuse = 0.0f;
|
|
#ifdef TERRAIN_STANDARD_SHADER
|
|
mixedDiffuse += splat_control.r * tex2D(_Splat0, uvSplat0) * half4(1.0, 1.0, 1.0, defaultAlpha.r);
|
|
mixedDiffuse += splat_control.g * tex2D(_Splat1, uvSplat1) * half4(1.0, 1.0, 1.0, defaultAlpha.g);
|
|
mixedDiffuse += splat_control.b * tex2D(_Splat2, uvSplat2) * half4(1.0, 1.0, 1.0, defaultAlpha.b);
|
|
mixedDiffuse += splat_control.a * tex2D(_Splat3, uvSplat3) * half4(1.0, 1.0, 1.0, defaultAlpha.a);
|
|
#else
|
|
mixedDiffuse += splat_control.r * tex2D(_Splat0, uvSplat0);
|
|
mixedDiffuse += splat_control.g * tex2D(_Splat1, uvSplat1);
|
|
mixedDiffuse += splat_control.b * tex2D(_Splat2, uvSplat2);
|
|
mixedDiffuse += splat_control.a * tex2D(_Splat3, uvSplat3);
|
|
#endif
|
|
|
|
#ifdef _NORMALMAP
|
|
mixedNormal = UnpackNormalWithScale(tex2D(_Normal0, uvSplat0), _NormalScale0) * splat_control.r;
|
|
mixedNormal += UnpackNormalWithScale(tex2D(_Normal1, uvSplat1), _NormalScale1) * splat_control.g;
|
|
mixedNormal += UnpackNormalWithScale(tex2D(_Normal2, uvSplat2), _NormalScale2) * splat_control.b;
|
|
mixedNormal += UnpackNormalWithScale(tex2D(_Normal3, uvSplat3), _NormalScale3) * splat_control.a;
|
|
#if defined(SHADER_API_SWITCH)
|
|
mixedNormal.z += UNITY_HALF_MIN; // to avoid nan after normalizing
|
|
#else
|
|
mixedNormal.z += 1e-5f; // to avoid nan after normalizing
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(INSTANCING_ON) && defined(SHADER_TARGET_SURFACE_ANALYSIS) && defined(TERRAIN_INSTANCED_PERPIXEL_NORMAL)
|
|
mixedNormal = float3(0, 0, 1); // make sure that surface shader compiler realizes we write to normal, as UNITY_INSTANCING_ENABLED is not defined for SHADER_TARGET_SURFACE_ANALYSIS.
|
|
#endif
|
|
|
|
#if defined(UNITY_INSTANCING_ENABLED) && !defined(SHADER_API_D3D11_9X) && defined(TERRAIN_INSTANCED_PERPIXEL_NORMAL)
|
|
|
|
#if defined(TERRAIN_USE_SEPARATE_VERTEX_SAMPLER)
|
|
float3 geomNormal = normalize(_TerrainNormalmapTexture.Sample(sampler__TerrainNormalmapTexture, IN.tc.zw).xyz * 2 - 1);
|
|
#else
|
|
float3 geomNormal = normalize(tex2D(_TerrainNormalmapTexture, IN.tc.zw).xyz * 2 - 1);
|
|
#endif
|
|
|
|
#ifdef _NORMALMAP
|
|
float3 geomTangent = normalize(cross(geomNormal, float3(0, 0, 1)));
|
|
float3 geomBitangent = normalize(cross(geomTangent, geomNormal));
|
|
mixedNormal = mixedNormal.x * geomTangent
|
|
+ mixedNormal.y * geomBitangent
|
|
+ mixedNormal.z * geomNormal;
|
|
#else
|
|
mixedNormal = geomNormal;
|
|
#endif
|
|
mixedNormal = mixedNormal.xzy;
|
|
#endif
|
|
}
|
|
|
|
#ifndef TERRAIN_SURFACE_OUTPUT
|
|
#define TERRAIN_SURFACE_OUTPUT SurfaceOutput
|
|
#endif
|
|
|
|
void SplatmapFinalColor(Input IN, TERRAIN_SURFACE_OUTPUT o, inout fixed4 color)
|
|
{
|
|
color *= o.Alpha;
|
|
#ifdef TERRAIN_SPLAT_ADDPASS
|
|
UNITY_APPLY_FOG_COLOR(IN.fogCoord, color, fixed4(0,0,0,0));
|
|
#else
|
|
UNITY_APPLY_FOG(IN.fogCoord, color);
|
|
#endif
|
|
}
|
|
|
|
void SplatmapFinalGBuffer(Input IN, TERRAIN_SURFACE_OUTPUT o, inout half4 outGBuffer0, inout half4 outGBuffer1, inout half4 outGBuffer2, inout half4 emission)
|
|
{
|
|
UnityStandardDataApplyWeightToGbuffer(outGBuffer0, outGBuffer1, outGBuffer2, o.Alpha);
|
|
emission *= o.Alpha;
|
|
}
|
|
|
|
#endif // TERRAIN_BASE_PASS
|
|
|
|
#endif // TERRAIN_SPLATMAP_COMMON_CGINC_INCLUDED
|