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86 行
2.0 KiB

Shader "Hidden/HDRenderPipeline/Sky/SkyHDRI"
{
HLSLINCLUDE
#pragma vertex Vert
#pragma fragment Frag
#pragma target 4.5
#pragma only_renderers d3d11 ps4 vulkan metal // TEMP: until we go further in dev
#include "ShaderLibrary/Common.hlsl"
#include "ShaderLibrary/Color.hlsl"
#include "ShaderLibrary/CommonLighting.hlsl"
TEXTURECUBE(_Cubemap);
SAMPLERCUBE(sampler_Cubemap);
float4 _SkyParam; // x exposure, y multiplier, z rotation
float4x4 _PixelCoordToViewDirWS; // Actually just 3x3, but Unity can only set 4x4
struct Attributes
{
uint vertexID : SV_VertexID;
};
struct Varyings
{
float4 positionCS : SV_POSITION;
};
Varyings Vert(Attributes input)
{
Varyings output;
output.positionCS = GetFullScreenTriangleVertexPosition(input.vertexID, UNITY_RAW_FAR_CLIP_VALUE);
return output;
}
float4 Frag(Varyings input) : SV_Target
{
// Points towards the camera
float3 viewDirWS = normalize(mul(float3(input.positionCS.xy, 1.0), (float3x3)_PixelCoordToViewDirWS));
// Reverse it to point into the scene
float3 dir = -viewDirWS;
// Rotate direction
float phi = DegToRad(_SkyParam.z);
float cosPhi, sinPhi;
sincos(phi, sinPhi, cosPhi);
float3 rotDirX = float3(cosPhi, 0, -sinPhi);
float3 rotDirY = float3(sinPhi, 0, cosPhi);
dir = float3(dot(rotDirX, dir), dir.y, dot(rotDirY, dir));
float3 skyColor = ClampToFloat16Max(SAMPLE_TEXTURECUBE_LOD(_Cubemap, sampler_Cubemap, dir, 0).rgb * exp2(_SkyParam.x) * _SkyParam.y);
return float4(skyColor, 1.0);
}
ENDHLSL
SubShader
{
Pass
{
ZWrite Off
ZTest Always
Blend Off
Cull Off
HLSLPROGRAM
ENDHLSL
}
Pass
{
ZWrite Off
ZTest LEqual
Blend Off
Cull Off
HLSLPROGRAM
ENDHLSL
}
}
Fallback Off
}