screen filters system?

assets/shaders/lcd.gdshader

@@ -0,0 +1,43 @@
+shader_type canvas_item;
+
+uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
+
+uniform bool enabled = true;
+uniform vec2 resolution;
+uniform vec2 curvature;
+uniform vec2 scanline_opacity;
+uniform float brightness;
+
+vec2 curve_uv(vec2 uv) {
+    uv = uv * 2.0 - 1.0;
+    vec2 offset = abs(uv.yx) / vec2(curvature.x, curvature.y);
+    uv = uv + uv * offset * offset;
+    uv = uv * 0.5 + 0.5;
+    return uv;
+}
+
+vec3 scanline_intensity(float uv, float res, float opacity) {
+    float intensity = sin((uv * res - 0.25) * PI * 2.0);
+    intensity = ((0.5 * intensity) + 0.5) * 0.9 + 0.1;
+    return vec3(pow(intensity, opacity));
+}
+
+void fragment() {
+	if (enabled) {
+	vec2 curved_uv = SCREEN_UV;
+	vec3 base_color = texture(SCREEN_TEXTURE, curved_uv).rgb;
+	
+	base_color += vec3(1.0/256.0);
+	base_color *= scanline_intensity(curved_uv.x, resolution.x, scanline_opacity.y);
+	base_color *= scanline_intensity(curved_uv.y, resolution.y, scanline_opacity.x);
+	base_color *= vec3(brightness);
+	
+	if (curved_uv.x < 0.0 || curved_uv.y < 0.0 || curved_uv.x > 1.0 || curved_uv.y > 1.0) {
+        COLOR = vec4(0.0, 0.0, 0.0, 0.0);
+    } else {
+        COLOR = vec4(base_color, 1.0);
+    }
+	} else {
+		COLOR = texture(SCREEN_TEXTURE, SCREEN_UV);
+	}
+}