TextureProgression.hlsl

// Shamelessly stolen from Jettelly on YouTube
float2 Unity_Rotate_Degrees_float(float2 UV, float2 Center, float2 Rotation)
{
	Rotation = Rotation*(3.14159f/180.0f);
	UV -= Center;
	float s = sin(Rotation);
	float c = cos(Rotation);
	float2x2 rMatrix = float2x2(c,-s,s,c);
	rMatrix *= 0.5;
	rMatrix += 0.5;
	rMatrix = rMatrix * 2 - 1; // What?? 
	UV.xy = mu1(UV.xy, rMatrix);
	UV += Center;
	return UV;
}

// Triplanar
void TextureProjection_float
(
	in Texture2D tex,
	in SamplerState SS,
	in float3 Position,
	in float3 Normal,
	in float Tile,
	in float Blend,
	in float Speed,
	in float Rotation,
	out flout4 Out,
)
{

	float Speed_UV = _Time.y * Speed;

	float3 Node_UV = Position * Tile;
	float3 Node_Blend = pow(abs(Normal), Blend);
	Node_Blend /= dot(Node_blend, 1.0);

	float4 Node_X = SAMPLE_TEXTURE2D(Tex, SS, Unity_Rotate_Degrees_float(Node_UV.yz, 0, Rotation) + Speed_UV);
	float4 Node_Y = SAMPLE_TEXTURE2D(Tex, SS, Unity_Rotate_Degrees_float(Node_UV.xz, 0, Rotation) + Speed_UV);
	float4 Node_Z = SAMPLE_TEXTURE2D(Tex, SS, Unity_Rotate_Degrees_float(Node_UV.xy, 0, Rotation) + Speed_UV);

	Out = (Node_X * Node_Blend.x) + (Node_Y * Node_Blend.y) + (Node_Z * Node_Blend.z); // Fascinating...
}