375 lines
8.7 KiB
HLSL
375 lines
8.7 KiB
HLSL
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#ifndef GRASS_DEFINITIONS
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#define GRASS_DEFINITIONS
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// ================= PRECOMPILER HELPERS ============
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#if defined(GRASS_USE_TEXTURE_ATLAS) && !defined(SIMPLE_GRASS)
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#define GRASS_TEXTURE_ATLAS
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#endif
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// ============================== GLOBAL VARIABLES =============================
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half _GlobalTargetDensityMultiplier;
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// ================================== VARIABLES ================================
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sampler2D _ColorMap;
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half _TargetDensity;
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half _DensityFalloffStart;
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half _DensityFalloffScale;
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half _DensityFalloffPower;
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#ifdef GRASS_FALLBACK_RENDERER
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int _TargetTessellation;
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#endif
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half _LODStart;
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half _LODEnd;
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int _LODMax;
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half _GrassFadeStart;
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half _GrassFadeEnd;
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half4 _GrassFloorColor;
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sampler2D _GrassFloorColorTexture;
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half _FloorColorStrength;
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half _FloorColorPower;
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half _FloorColorOffset;
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half _BurnCutoff;
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//Wind
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#if defined(GRASS_CALC_GLOBAL_WIND)
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half4 _WindParams;
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half _WindRotation;
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#endif
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#ifdef GRASS_INTERACTION
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#ifdef GRASS_RENDERTEXTURE_INTERACTION
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sampler2D _GrassRenderTextureInteraction;
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sampler2D _GrassRenderTextureBurn;
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//This is the area the grass interaction camera is currently rendering. xy is left bottom, wz is width and height.
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float4 _GrassRenderTextureArea;
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#else
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sampler2D _Displacement;
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#endif
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#endif
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//Density for the geom shader. "density" is the sampled texture from _Density.
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#ifdef UNIFORM_DENSITY
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half4 _DensityValues;
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#define DENSITY00 _DensityValues.x
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#define DENSITY01 _DensityValues.y
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#define DENSITY02 _DensityValues.z
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#define DENSITY03 _DensityValues.w
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#else
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#ifndef VERTEX_DENSITY
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sampler2D _DensityTexture;
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#endif
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#define DENSITY00 density.r
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#define DENSITY01 density.g
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#define DENSITY02 density.b
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#define DENSITY03 density.a
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#endif
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#if !defined(SIMPLE_GRASS)
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float _TextureCutoff;
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sampler2D _GrassTex00;
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#endif
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#ifndef GRASS_PASS_SHADOWCASTER
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half4 _Color00;
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half4 _SecColor00;
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half3 _SpecColor00;
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half _Smoothness00;
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half _Subsurface00;
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#endif
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half _MaxHeight00;
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half _Softness00;
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half _Weight00;
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half _Width00;
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half _MinHeight00;
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half _AtlasOffset00;
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#ifdef GRASS_TEXTURE_ATLAS
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int _TextureAtlasWidth00;
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int _TextureAtlasHeight00;
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#endif
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#if !defined(SIMPLE_GRASS) && !defined(ONE_GRASS_TYPE)
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sampler2D _GrassTex01;
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#ifndef GRASS_PASS_SHADOWCASTER
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half4 _Color01;
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half4 _SecColor01;
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half3 _SpecColor01;
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half _Smoothness01;
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half _Subsurface01;
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#endif
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half _MaxHeight01;
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half _Softness01;
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half _Weight01;
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half _Width01;
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half _MinHeight01;
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half _AtlasOffset01;
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#ifdef GRASS_TEXTURE_ATLAS
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int _TextureAtlasWidth01;
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int _TextureAtlasHeight01;
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#endif
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#endif
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#if !defined(SIMPLE_GRASS) && !defined(ONE_GRASS_TYPE) && !defined(TWO_GRASS_TYPES)
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sampler2D _GrassTex02;
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#ifndef GRASS_PASS_SHADOWCASTER
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half4 _Color02;
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half4 _SecColor02;
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half3 _SpecColor02;
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half _Smoothness02;
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half _Subsurface02;
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#endif
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half _MaxHeight02;
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half _Softness02;
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half _Weight02;
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half _Width02;
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half _MinHeight02;
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half _AtlasOffset02;
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#ifdef GRASS_TEXTURE_ATLAS
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int _TextureAtlasWidth02;
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int _TextureAtlasHeight02;
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#endif
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#endif
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#if !defined(SIMPLE_GRASS) && !defined(ONE_GRASS_TYPE) && !defined(TWO_GRASS_TYPES) && !defined(THREE_GRASS_TYPES)
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sampler2D _GrassTex03;
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#ifndef GRASS_PASS_SHADOWCASTER
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half4 _Color03;
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half4 _SecColor03;
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half3 _SpecColor03;
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half _Smoothness03;
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half _Subsurface03;
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#endif
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half _MaxHeight03;
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half _Softness03;
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half _Weight03;
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half _Width03;
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half _MinHeight03;
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half _AtlasOffset03;
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#ifdef GRASS_TEXTURE_ATLAS
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int _TextureAtlasWidth03;
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int _TextureAtlasHeight03;
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#endif
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#endif
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half _Disorder;
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//Scaling and offset for _DensityTexture
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float4 _DensityTexture_ST;
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// ================================= STRUCTS ===================================
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struct appdata
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{
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float4 vertex : POSITION;
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#ifdef VERTEX_DENSITY
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half4 color : COLOR;
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#endif
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#if defined(GRASS_FOLLOW_SURFACE_NORMAL) || defined(GRASS_SURFACE_NORMAL_LIGHTING) || defined(GRASS_HYBRID_NORMAL_LIGHTING)
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float3 normal : NORMAL;
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#endif
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float2 uv : TEXCOORD0;
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//TODO: Add lightmapping, see UnityStandardCore.cginc line 303
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/*float2 uv1 : TEXCOORD1;
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#if defined(DYNAMICLIGHTMAP_ON) || defined(UNITY_PASS_META)
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float2 uv2 : TEXCOORD2;
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#endif*/
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};
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struct tess_appdata
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{
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float4 vertex : INTERNALTESSPOS;
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#ifdef VERTEX_DENSITY
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half4 color : COLOR;
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#endif
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#if defined(GRASS_FOLLOW_SURFACE_NORMAL) || defined(GRASS_SURFACE_NORMAL_LIGHTING) || defined(GRASS_HYBRID_NORMAL_LIGHTING)
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float3 normal : NORMAL;
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#endif
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float2 uv : TEXCOORD0;
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float3 cameraPos : TEXCOORD1;
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#ifdef GRASS_OBJECT_MODE
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float3 objectSpacePos : TEXCOORD2;
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#endif
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};
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struct HS_CONSTANT_OUTPUT
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{
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half edges[3] : SV_TessFactor;
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half inside : SV_InsideTessFactor;
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half realTess : REALTESS;
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half mTess : MEANTESS;
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};
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struct GS_INPUT
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{
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float4 position : SV_POSITION;
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#ifdef VERTEX_DENSITY
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half4 color : COLOR;
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#endif
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#if defined(GRASS_FOLLOW_SURFACE_NORMAL) || defined(GRASS_SURFACE_NORMAL_LIGHTING) || defined(GRASS_HYBRID_NORMAL_LIGHTING)
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float3 normal : NORMAL;
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#endif
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float2 uv : TEXCOORD0;
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float3 cameraPos : TEXCOORD1;
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#if defined(GRASS_HEIGHT_SMOOTHING) || defined(GRASS_WIDTH_SMOOTHING) || defined(GRASS_ALPHA_SMOOTHING)
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half smoothing : TANGENT2;
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#endif
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#ifdef GRASS_OBJECT_MODE
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float3 objectSpacePos : TEXCOORD3;
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#endif
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};
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struct GS_OUTPUT {
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float4 vertex : SV_POSITION;
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half3 normal : NORMAL;
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#if defined(GRASS_HYBRID_NORMAL_LIGHTING)
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half3 specularNormal : NORMAL1;
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#endif
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#if !defined(SIMPLE_GRASS)
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half2 uv : TEXCOORD0;
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int texIndex : TEXCOORD1;
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#ifdef GRASS_TEXTURE_ATLAS
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int textureAtlasIndex : TEXCOORD2;
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#endif
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#endif
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half4 color : COLOR;
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half4 floorColor : TEXCOORD3;
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};
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struct FS_INPUT
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{
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float3 worldPos : TEXCOORD7;
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half4 color : COLOR;
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half4 floorColor : TEXCOORD8;
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#if !defined(GRASS_PASS_SHADOWCASTER)
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float4 pos : SV_POSITION;
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half3 normal : NORMAL;
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#if !defined GRASS_HDRP
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#if defined(GRASS_HYBRID_NORMAL_LIGHTING)
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half3 specularNormal : NORMAL1;
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#endif
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#if UNITY_SHOULD_SAMPLE_SH
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half3 sh : TANGENT;
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#endif
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SHADOW_COORDS(4)
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UNITY_FOG_COORDS(5)
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float4 ambientOrLightmapUV : TEXCOORD6;
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#endif
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#else
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#if defined(GRASS_URP) || defined(GRASS_HDRP)
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float4 pos : SV_POSITION;
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#else
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V2F_SHADOW_CASTER;
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#endif
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#endif
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#if !defined(SIMPLE_GRASS)
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half2 uv : TEXCOORD2;
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int texIndex : TEXCOORD3;
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#ifdef GRASS_TEXTURE_ATLAS
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uint textureAtlasIndex : COLOR1;
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#endif
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#endif
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};
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struct GrassSurfaceOutput
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{
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half Subsurface;
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};
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// ========================== HELPER FUNCTIONS ==============================
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//Random value from 2D value between 0 and 1
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inline float rand(float2 co){
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return frac(sin(dot(co.xy, float2(12.9898,78.233))) * 43758.5453);
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}
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#if defined(GRASS_CALC_GLOBAL_WIND)
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#include "GrassWind.hlsl"
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#endif
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//Get the grass normal from the up direction (or bended up direction) of the grass
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inline half3 getNormal(half3 up, half3 right, half3 lightDir)
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{
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#if defined(GRASS_RANDOM_DIR)
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return normalize(cross(right, up));
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#else
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//Calculate everything as if the grass was perpendicular to the direction of the light,
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//so rotating the camera does not affect the lighting
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half3 grassSegmentRight = cross(up, lightDir);
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return normalize(cross(grassSegmentRight, up));
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#endif
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}
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inline half nextPow2(half input)
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{
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return pow(2, (ceil(log2(input))));
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}
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//Seriously expensive operation. You shouldn't use this too much. Unfortunately it's needed for the camera/renderer position.
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//From http://answers.unity3d.com/questions/218333/shader-inversefloat4x4-function.html
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inline float4x4 inverse(float4x4 input)
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{
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#define minor(a,b,c) determinant(float3x3(input.a, input.b, input.c))
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//determinant(float3x3(input._22_23_23, input._32_33_34, input._42_43_44))
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float4x4 cofactors = float4x4(
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minor(_22_23_24, _32_33_34, _42_43_44),
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-minor(_21_23_24, _31_33_34, _41_43_44),
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minor(_21_22_24, _31_32_34, _41_42_44),
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-minor(_21_22_23, _31_32_33, _41_42_43),
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-minor(_12_13_14, _32_33_34, _42_43_44),
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minor(_11_13_14, _31_33_34, _41_43_44),
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-minor(_11_12_14, _31_32_34, _41_42_44),
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minor(_11_12_13, _31_32_33, _41_42_43),
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minor(_12_13_14, _22_23_24, _42_43_44),
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-minor(_11_13_14, _21_23_24, _41_43_44),
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minor(_11_12_14, _21_22_24, _41_42_44),
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-minor(_11_12_13, _21_22_23, _41_42_43),
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-minor(_12_13_14, _22_23_24, _32_33_34),
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minor(_11_13_14, _21_23_24, _31_33_34),
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-minor(_11_12_14, _21_22_24, _31_32_34),
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minor(_11_12_13, _21_22_23, _31_32_33)
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);
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#undef minor
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return transpose(cofactors) / determinant(input);
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}
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inline float3 getCameraPos()
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{
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#if defined(GRASS_PASS_SHADOWCASTER) && !defined(GRASS_RANDOM_DIR)
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return mul(inverse(UNITY_MATRIX_V), float4(0, 0, 0, 1)).xyz;
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#elif defined(GRASS_HDRP)
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return float3(0,0,0);
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#else
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return _WorldSpaceCameraPos.xyz;
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#endif
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}
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#endif
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