98 lines
No EOL
2.5 KiB
HLSL
98 lines
No EOL
2.5 KiB
HLSL
#include "UnityCG.cginc"
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#define UNITY_INDIRECT_DRAW_ARGS IndirectDrawIndexedArgs
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#include "UnityIndirect.cginc"
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#include "Assets/Pixel3D/Shaders/Random.cginc"
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#include "Lighting.cginc"
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#include "AutoLight.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct v2f
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{
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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float2 colorTexUV : TEXCOORD1;
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uint instanceID : SV_InstanceID;
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float depth : Depth;
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float4 worldPosition : POSITION1;
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SHADOW_COORDS(2)
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};
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struct GrassData
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{
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float3 position;
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float2 colorTexUV;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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sampler2D _ColorTex;
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float _AlphaCutout;
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float4 _TipColor;
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float _TipColorShift;
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float _Scale;
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float _WindSpeed;
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float _WindStrength;
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StructuredBuffer<GrassData> _GrassData;
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float4 _Rotation;
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float _MeshHeight;
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float remap(float value, float low1, float high1, float low2, float high2)
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{
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return low2 + (value - low1) * (high2 - low2) / (high1 - low1);
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}
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float luma(float3 color)
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{
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return dot(color, float3(0.2126729, 0.7151522, 0.0721750));
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}
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// https://gamedev.stackexchange.com/questions/28395/
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float3 rotate(float3 v, float4 quaternion)
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{
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float3 u = quaternion.xyz;
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float s = quaternion.w;
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return 2 * dot(u, v) * u + (s * s - dot(u, u)) * v + 2 * s * cross(u, v);
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}
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v2f vert (appdata v, uint svInstanceID : SV_InstanceID)
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{
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InitIndirectDrawArgs(0);
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uint cmdID = GetCommandID(0);
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uint instanceID = GetIndirectInstanceID(svInstanceID);
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v2f o;
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float offset = randValue(instanceID) * 20;
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float3 localPosition = v.vertex.xyz + float3(0, _MeshHeight / 2, 0);
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localPosition *= _Scale;
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localPosition.x += sin((_Time.y + offset) * _WindSpeed + localPosition.y - 0.5) * _WindStrength * pow(v.uv.y, 5);
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float4 worldPosition = float4(rotate(localPosition, _Rotation) + _GrassData[instanceID].position, 1);
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o.worldPosition = worldPosition;
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o.pos = UnityObjectToClipPos(worldPosition);
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o.uv = v.uv;
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o.colorTexUV = _GrassData[instanceID].colorTexUV;
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o.instanceID = instanceID;
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o.depth = o.pos.z;
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TRANSFER_SHADOW(o)
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return o;
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}
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float4 frag(v2f i) : SV_Target
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{
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float4 tex = tex2D(_MainTex, i.uv);
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if (tex.a < _AlphaCutout)
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discard;
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float shadow = remap(step(0.75, SHADOW_ATTENUATION(i)), 0, 1, 0.5, 1);
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float4 color = tex2D(_ColorTex, i.colorTexUV) * tex;
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float lum = luma(color.rgb);
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float lumTip = luma(_TipColor.rgb);
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float4 tipColor = lerp(color, _TipColor, _TipColorShift);
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return float4(lerp(color, tipColor, i.uv.y).rgb * shadow, 1);
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} |