shader_type canvas_item;

uniform float scanline_count : hint_range(0, 1800) = 50.0;

vec2 uv_curve(vec2 uv)
{
	float rotation = -3.1415/8f;
	uv = (uv - 0.5) * 2.0;
	
	//You can modify the numbers and try different values
	uv.x *= 1.0 + pow(abs(uv.y) / 3.0, 2.0);
	uv.y *= 1.0 + pow(abs(uv.x) / 3.0, 2.0);
	
	//The scale part (you can delete it when you want)
	uv /= 1.2;
	
	uv = (uv/2.0) + 0.5;
	vec2 pivot=vec2(0.5);
	float sine = sin(rotation);
    float cosine = cos(rotation);
	uv -= pivot;
    uv.x = uv.x * cosine - uv.y * sine;
    uv.y = uv.x * sine + uv.y * cosine;
    uv += pivot;
	return uv;
}


void fragment()
{	
	float PI = 3.14159;
	
	//You can modify the *3.0, *-3.0 for a bigger or smaller 
	float r = texture(TEXTURE, uv_curve(SCREEN_UV) + vec2(SCREEN_PIXEL_SIZE.x*0.0), 0.0).r;
	float g = texture(TEXTURE, uv_curve(SCREEN_UV) + vec2(SCREEN_PIXEL_SIZE.x*0.5), 0.0).g;
	float b = texture(TEXTURE, uv_curve(SCREEN_UV) + vec2(SCREEN_PIXEL_SIZE.x*-0.5), 0.0).b;
	
	
	//If you dont want scanlines you can just delete this part
	float s = sin(uv_curve(SCREEN_UV).y * scanline_count * PI * 2.0);
	s = (s * 0.5 + 0.5) * 0.9 + 0.1;
	vec4 scan_line = vec4(vec3(pow(s, 0.25)), 1.0);
	
	vec4 text=vec4(r, g, b, 1.0) * scan_line;
	vec4 newColor=texture(TEXTURE,UV);
	if (newColor.a>0.0){
		newColor = text;
	}
	COLOR=newColor;
	
}