CodeWalker/CodeWalker.Shaders/LodLightsVS.hlsl

68 lines
1.8 KiB
HLSL
Raw Normal View History

#include "Common.hlsli"
struct LODLight
{
float3 Position;
uint Colour;
float3 Direction;
uint TimeAndStateFlags;
float4 TangentX;
float4 TangentY;
float Falloff;
float FalloffExponent;
float InnerAngle; //for cone
float OuterAngleOrCapExt; //outer angle for cone, cap extent for capsule
};
struct VS_Output
{
float4 Pos : SV_POSITION;
float4 Screen : TEXCOORD0;
uint IID : SV_INSTANCEID;
};
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;
}
StructuredBuffer<LODLight> LODLights : register(t0);
VS_Output main(float4 ipos : POSITION, uint iid : SV_InstanceID)
{
LODLight lodlight = LODLights[iid];
float extent = lodlight.Falloff;
float3 opos = 0;
if (LightType == 1)//point (sphere)
{
opos = ipos.xyz * extent;
}
else if (LightType == 2)//spot (cone)
{
2019-12-05 12:04:00 +08:00
float arads = lodlight.OuterAngleOrCapExt;
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 * lodlight.TangentX.xyz) + (cpos.y * lodlight.TangentY.xyz) + (cpos.z * lodlight.Direction.xyz);
}
else if (LightType == 4)//capsule
{
float3 cpos = ipos.xyz * extent;
2019-12-05 12:04:00 +08:00
cpos.y += (ipos.w * 2 - 1) * lodlight.OuterAngleOrCapExt;
opos = (cpos.x * lodlight.TangentX.xyz) + (cpos.y * lodlight.Direction.xyz) + (cpos.z * lodlight.TangentY.xyz);
}
opos += (lodlight.Position - CameraPos.xyz);
float4 spos = mul(float4(opos, 1), ViewProj);
VS_Output output;
output.Pos = spos;
output.Screen = spos;
output.IID = iid;
return output;
}