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GodotRetro/Screen Shaders/Aditional Shaders/B&W.shader

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+//SHADER ORIGINALY CREADED BY "demofox" FROM SHADERTOY
+//MODIFIED AND PORTED TO GODOT BY AHOPNESS (@ahopness)
+//LICENSE : CC0
+//COMATIBLE WITH : GLES2, GLES3, WEBGL
+//SHADERTOY LINK : https://www.shadertoy.com/view/XdXSzX
+
+shader_type canvas_item;
+
+uniform float contrast :hint_range(0.0, 3.0) = 1.0;
+uniform float brightness :hint_range(-1.0, 1.0) = 0.0;
+
+
+void fragment(){
+	vec2 uv = FRAGCOORD.xy / (1.0 / SCREEN_PIXEL_SIZE).xy;
+	
+	vec3 pixelColor = texture(SCREEN_TEXTURE, uv).xyz;
+	
+	// Grayscale
+	float pixelGrey = dot(pixelColor, vec3(0.2126, 0.7152, 0.0722));
+	pixelColor = vec3(pixelGrey);
+	
+	// Contrast
+	pixelColor.rgb = ((pixelColor.rgb - 0.5) * max(contrast, 0.0)) + 0.5;
+	
+	// Brightness
+	pixelColor.rgb += brightness;
+	
+	COLOR = vec4(pixelColor, 1.0);
+}