shader_type canvas_item;

// Positive values lean right, negative lean left
uniform float skew_x : hint_range(-2.0, 2.0) = 0.0;
// Positive values lean down, negative lean up
uniform float skew_y : hint_range(-2.0, 2.0) = 0.0;

void vertex() {
	// 1. Get the size of the Control node
	vec2 size = 1.0 / TEXTURE_PIXEL_SIZE;
	
	// 2. Move the pivot to the center for a natural tilt
	// Without this, it skews from the top-left corner
	VERTEX -= size * 0.5;
	
	// 3. Apply the Skew math
	// We use a temporary variable so the calculations don't interfere
	float old_x = VERTEX.x;
	float old_y = VERTEX.y;
	
	VERTEX.x = old_x + (old_y * skew_x);
	VERTEX.y = old_y + (old_x * skew_y);
	
	// 4. Move back from the center
	VERTEX += size * 0.5;
}