vec4 pixelize(vec4 image, vec2 scaleVec, vec2 texCoord) {
	float scale = max(scaleVec.x, scaleVec.y);
	float x = fract(texCoord.x * 160.0) * scale;
	float y = fract(texCoord.y * 144.0) * scale;

	float border = 1.0;

	if (scale > 5.0) {
		border = 2.0;
	}

	if (x < border || x > scale - border || y < border || y > scale - border) {
		return vec4(.95, .95, .95, 1);
	}

	return image;
}

vec4 scale(sampler2D image) {
	vec2 displayScale = uResolution / vec2(160.0, 144.0);
	vec2 texCoord = vec2(gl_FragCoord.x, uResolution.y - gl_FragCoord.y) / uResolution;
	vec4 sampled = texture(image, texCoord);

	if (displayScale.x < 3.0 || displayScale.y < 3.0) {
		return sampled;
	}

	float mixValue = 1.0;

	if (displayScale.x >= 5.0 && displayScale.y >= 5.0) {
		mixValue = 0.5;
	}
	else if (displayScale.x >= 3.0 && displayScale.y >= 3.0) {
		mixValue = 0.8;
	}

	return mix(pixelize(sampled, displayScale, texCoord), sampled, mixValue);
}