Funkin/source/shaderslmfao/TitleOutline.hx

package shaderslmfao;

import flixel.math.FlxPoint;
import flixel.system.FlxAssets.FlxShader;

class TitleOutline extends FlxShader
{
	public var funnyX(default, set):Float = 0;
	public var funnyY(default, set):Float = 0;

	function set_funnyX(x:Float):Float
	{
		xPos.value[0] = x;

		return x;
	}

	function set_funnyY(y:Float):Float
	{
		yPos.value[0] = y;

		return y;
	}

	@:glFragmentSource('
        #pragma header

        // uniform float alphaShit;
        uniform float xPos;
        uniform float yPos;

        vec3 rgb2hsv(vec3 c)
        {
            vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
            vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
            vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));

            float d = q.x - min(q.w, q.y);
            float e = 1.0e-10;
            return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
        }

        void main()
        {
            vec4 color = flixel_texture2D(bitmap, openfl_TextureCoordv);
            vec2 size = vec2(xPos, yPos);

            if (color.a == 0.0) {
                float w = size.x / openfl_TextureSize.x;
                float h = size.y / openfl_TextureSize.y;
                
                vec4 colorOffset = flixel_texture2D(bitmap, vec2(openfl_TextureCoordv.x - w, openfl_TextureCoordv.y - h));


                vec3 hsvShit = rgb2hsv(vec3(colorOffset.r, colorOffset.g, colorOffset.b));

                if (hsvShit.b <= 0.1 && colorOffset.a != 0.)
                    color = vec4(0.0, 1.0, 0.8, color.a);
            }
            
            gl_FragColor = color;
        }

    ')
	public function new()
	{
		super();

		xPos.value = [0];
		yPos.value = [0];
	}
}