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#ifndef __TEXTURE_UTILS_INC
#define __TEXTURE_UTILS_INC
#include "interpolators.cginc"
float2 get_uv_by_channel(v2f i, uint which_channel) {
[forcecase]
switch (which_channel) {
case 0:
return i.uv01.xy;
break;
case 1:
return i.uv01.zw;
break;
case 2:
return i.uv23.xy;
break;
case 3:
return i.uv23.zw;
break;
default:
return 0;
break;
}
}
#define UV_SCOFF_IMPL(uv, tex_st) (uv) * (tex_st).xy + (tex_st).zw
#define UV_SCOFF(i, tex_st, which_channel) UV_SCOFF_IMPL(get_uv_by_channel(i, round(which_channel)), tex_st)
#endif // __TEXTURE_UTILS_INC
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