shader_type canvas_item;

uniform sampler2D unlitTex;
uniform sampler2D litTex;
uniform sampler2D binDataTex;
uniform int n;

const int cellSize = 8;

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

void fragment() {
	// Called for every pixel the material is visible on.
	vec2 totalGridSize = vec2(float(n) * float(cellSize));

	vec2 scaledUV = UV * float(n);
	ivec2 cellIdx = ivec2(floor(scaledUV));
	vec2 cellUV = fract(scaledUV);

	float binVal = texelFetch(binDataTex, cellIdx, 0).r;
	bool isWhite = binVal > 0.5;

	vec4 color = texture(unlitTex, cellUV);
	if (isWhite) {
		color = texture(litTex, cellUV);
	}

	COLOR = color;
}

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