UtilityFunctions.cginc

float2 TranslateSt(float2 st, float2 pos)
{
	float3x3 mat = float3x3(
		1, 0, pos.x,
		0, 1, pos.y,
		0, 0,	  1);

	st -= 0.5;
	st = mul(mat, float3(st, 1));
	st += 0.5;

	return st;
}

float2 RotateSt(float2 st, float angle)
{
	float3x3 mat = float3x3(
		cos(angle), -sin(angle), 0,
		sin(angle),  cos(angle), 0,
			 0,	      0, 1);

	st -= 0.5;
	st = mul(mat, float3(st, 1));
	st += 0.5;

	return st;
}

float2 ResizeSt(float2 st, float2 scale)
{
	float3x3 mat = float3x3(
		scale.x,       0, 0,
		      0, scale.y, 0,
		      0,       0, 1);

	st -= 0.5;
	st = mul(mat, float3(st, 1));
	st += 0.5;

	return st;
}