pixel line shader test

pixel_line.gdshader

shader_type canvas_item;
// pixelated shader for use with Line2D
// will still have incorrect behaviour at tips and corners where there can be diagonal cut-offs that don't align with pixel_size


uniform int pixel_size = 4;

void fragment() {
	vec2 rounded_pixel = floor(FRAGCOORD.xy / float(pixel_size)) * float(pixel_size);	// 
	vec2 pixel_diff = FRAGCOORD.xy - rounded_pixel;
	vec2 offset_scale = vec2(dFdx(UV.y),dFdy(UV.y));
	vec2 adjustment = pixel_diff * offset_scale;
	COLOR.rgb = vec3(0.0);
	float test_value = ( 1.0 - abs(UV.y - adjustment.x - adjustment.y - 0.5) * 2.0);
	COLOR.a = step(0.5, test_value);
}