65 lines
1.8 KiB
HLSL
65 lines
1.8 KiB
HLSL
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#if !defined(SHADOW_PROJECT_VERTEX)
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#define SHADOW_PROJECT_VERTEX
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struct Attributes
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{
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float3 vertex : POSITION;
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float4 tangent: TANGENT;
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float4 extrusion : COLOR;
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};
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struct Varyings
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{
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float4 vertex : SV_POSITION;
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};
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uniform float3 _LightPos;
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uniform float4x4 _ShadowModelMatrix; // This is a custom model matrix without scaling
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uniform float4x4 _ShadowModelInvMatrix;
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uniform float3 _ShadowModelScale; // This is the scale
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uniform float _ShadowRadius;
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Varyings ProjectShadow(Attributes v)
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{
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Varyings o;
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float3 vertexWS = TransformObjectToWorld(v.vertex); // This should be in world space
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float3 lightDir = _LightPos - vertexWS;
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lightDir.z = 0;
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// Start of code to see if this point should be extruded
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float3 lightDirection = normalize(lightDir);
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float adjShadowRadius = 1.4143 * _ShadowRadius; // Needed as our shadow fits like a circumscribed box around our light radius
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float3 endpoint = vertexWS + (adjShadowRadius * -lightDirection);
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float3 worldTangent = TransformObjectToWorldDir(v.tangent.xyz);
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float sharedShadowTest = saturate(ceil(dot(lightDirection, worldTangent)));
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// Start of code to calculate offset
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float3 vertexWS0 = TransformObjectToWorld(float3(v.extrusion.xy, 0));
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float3 vertexWS1 = TransformObjectToWorld(float3(v.extrusion.zw, 0));
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float3 shadowDir0 = vertexWS0 - _LightPos;
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shadowDir0.z = 0;
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shadowDir0 = normalize(shadowDir0);
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float3 shadowDir1 = vertexWS1 - _LightPos;
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shadowDir1.z = 0;
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shadowDir1 = normalize(shadowDir1);
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float3 shadowDir = normalize(shadowDir0 + shadowDir1);
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float3 sharedShadowOffset = sharedShadowTest * adjShadowRadius * shadowDir;
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float3 position;
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position = vertexWS + sharedShadowOffset;
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o.vertex = TransformWorldToHClip(position);
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return o;
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}
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#endif
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