CodeWalker/CodeWalker.Shaders/LightVS.hlsl

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#include "Common.hlsli"
struct VS_Output
{
float4 Pos : SV_POSITION;
float4 Screen : TEXCOORD0;
};
cbuffer VSLightVars : register(b0)
{
float4x4 ViewProj;
float4 CameraPos;
uint LightType; //0=directional, 1=Point, 2=Spot, 4=Capsule
uint IsLOD; //useful or not?
uint Pad0;
uint Pad1;
}
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cbuffer VSLightInstVars : register(b1)
{
float3 InstPosition;//camera relative
float InstIntensity;
float3 InstColour;
float InstFalloff;
float3 InstDirection;
float InstFalloffExponent;
float3 InstTangentX;
float InstConeInnerAngle;
float3 InstTangentY;
float InstConeOuterAngle;
float3 InstCapsuleExtent;
uint InstType;
float3 InstCullingPlaneNormal;
float InstCullingPlaneOffset;
}
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VS_Output main(float4 ipos : POSITION, uint iid : SV_InstanceID)
{
float3 opos = 0;
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float extent = InstFalloff;
if (InstType == 1)//point (sphere)
{
opos = ipos.xyz * extent;
}
else if (InstType == 2)//spot (cone)
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{
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float arads = InstConeOuterAngle;
float3 tpos = (ipos.xyz * sin(arads)) + float3(0, 0, ipos.w * cos(arads));
float3 cpos = ((ipos.w > 0) ? normalize(tpos) : tpos) * extent;
opos = (cpos.x * InstTangentX) + (cpos.y * InstTangentY) + (cpos.z * InstDirection);
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}
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else if (InstType == 4)//capsule
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{
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float3 cpos = ipos.xyz * extent;
cpos.y += abs(InstCapsuleExtent.x) * (ipos.w - 0.5);
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opos = (cpos.x * InstTangentX.xyz) + (cpos.y * InstDirection.xyz) + (cpos.z * InstTangentY.xyz);
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}
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float4 spos = mul(float4(opos + InstPosition, 1), ViewProj);
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VS_Output output;
output.Pos = spos;
output.Screen = spos;
return output;
}