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GodotRetro/Screen Shaders/Aditional Shaders/ColorPrecission.shader

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+//SHADER ORIGINALY CREADED BY "abelcamarena" FROM SHADERTOY
+//MODIFIED AND PORTED TO GODOT BY AHOPNESS (@ahopness)
+//LICENSE : CC0
+//COMATIBLE WITH : GLES2, GLES3, WEBGL
+//SHADERTOY LINK : https://www.shadertoy.com/view/tsKGDm
+
+// Looking for ditheirng? I reccomend using this shader instead : 
+// https://github.com/WittyCognomen/godot-psx-shaders/blob/master/shaders/psx_dither_post.shader
+// https://github.com/WittyCognomen/godot-psx-shaders/tree/master/shaders/dithers
+
+shader_type canvas_item;
+
+uniform float SCREEN_WIDTH = 320.; // Lower num - bigger pixels (this will be the screen width)
+uniform float COLOR_FACTOR :hint_range(0., 10.) = 4.;   // Higher num - higher colors quality
+
+void fragment(){                  
+	// Reduce pixels            
+	vec2 size = SCREEN_WIDTH * SCREEN_PIXEL_SIZE.xy/SCREEN_PIXEL_SIZE.x;
+	vec2 coor = floor( UV * size) ;
+	vec2 uv =  FRAGCOORD.xy / (1.0 / SCREEN_PIXEL_SIZE).xy;
+	
+	// Get source color
+	vec3 col = texture(SCREEN_TEXTURE, uv).xyz;     
+	
+	// Reduce colors    
+	col = floor(col * COLOR_FACTOR) / COLOR_FACTOR;    
+	
+	// Output to screen
+	COLOR = vec4(col,1.);
+}