shader_type canvas_item;

uniform vec2 target_tex_size = vec2(1280,720);

uniform float color_steps:hint_range(1.0, 255.0, 1.0);
uniform sampler2D color_curve;


void vertex() {
	// Called for every vertex the material is visible on.
}

void fragment() {
	//vec2 texSize = vec2(textureSize(TEXTURE,0)); // For performance reasons, this function should be avoided as it always performs a full texture read. When possible, you should pass the texture size as a uniform instead.
	//texSize = texSize / 4.;
	ivec2 intUv = ivec2(target_tex_size * UV);
	vec2 flooredUv = vec2(intUv) / target_tex_size;
	vec3 fullColor = texture(TEXTURE,flooredUv).rgb;
	vec3 strechedColor = vec3(
		texture(color_curve,vec2(fullColor.r,0)).r,
		texture(color_curve,vec2(fullColor.g,0)).g,
		texture(color_curve,vec2(fullColor.b,0)).b);
	vec3 scaledColor = strechedColor * color_steps;
	vec3 roundColor = round(scaledColor);
	vec3 backScaledColor = roundColor / color_steps;
	COLOR = vec4(backScaledColor,1);
	//COLOR = vec4(flooredUv,0,1);
	//COLOR = vec4(vec3(float(textureQueryLevels(TEXTURE)/1)),1);
	//COLOR = vec4(1,0,0,1);
}

//void light() {
//	// Called for every pixel for every light affecting the CanvasItem.
//	// Uncomment to replace the default light processing function with this one.
//}