38 lines
1.3 KiB
HLSL
38 lines
1.3 KiB
HLSL
uniform float4 _GS_SnowData1; // x = relief, y = occlusion, z = glitter, w = brightness
|
|
uniform float4 _GS_SnowData2; // x = minimum altitude, y = altitude scattering, z = coverage extension
|
|
uniform float4 _GS_SnowData3; // x = Sun occlusion, y = sun atten, z = ground coverage, w = grass coverage
|
|
uniform float4 _GS_SnowCamPos;
|
|
uniform half4 _GS_SnowTint;
|
|
uniform sampler2D_float _GS_DepthTexture;
|
|
|
|
struct Input {
|
|
float2 uv_MainTex;
|
|
fixed4 color : COLOR;
|
|
float3 worldPos;
|
|
};
|
|
|
|
|
|
// get snow coverage on grass
|
|
void SetGrassCoverage(Input IN, inout SurfaceOutput o) {
|
|
// prevent snow on sides and below minimum altitude
|
|
float minAltitude = saturate( IN.worldPos.y - _GS_SnowData2.x);
|
|
float snowCover = minAltitude * saturate(IN.uv_MainTex.y + _GS_SnowData3.w);
|
|
|
|
// mask support
|
|
#if defined(GLOBALSNOW_MASK)
|
|
float4 st = float4(IN.worldPos.xz - _GS_SnowCamPos.xz, 0, 0);
|
|
st *= _GS_SnowData2.z;
|
|
st += 0.5;
|
|
float zmask = tex2Dlod(_GS_DepthTexture, st).g;
|
|
snowCover = max(snowCover - zmask, 0);
|
|
#endif
|
|
|
|
// pass color data to output shader
|
|
o.Albedo = _GS_SnowData1.www;
|
|
o.Albedo.rgb *= _GS_SnowTint.rgb;
|
|
o.Alpha = snowCover * 0.96;
|
|
}
|
|
|
|
|
|
|