// MinecraftPT — Block Light
// Maps vanilla block light level to physical light, with per-block colors.

#ifndef BLOCKLIGHT_GLSL
#define BLOCKLIGHT_GLSL

// Convert lightmap blocklight (0-1) to physical light intensity
float BlocklightFromLightmap(float blocklight){
	return pow(blocklight, 2.0) * BLOCKLIGHT_BRIGHTNESS;
}

// Get the block light color for a material
vec3 BlocklightColor(float materialID){
	// Warm torch color by default
	vec3 color = pow(vec3(COLOR_TORCH_R, COLOR_TORCH_G, COLOR_TORCH_B), vec3(2.2));

	if (materialID == MATID_SOULTORCH || materialID == MATID_COPPER_LANTERN){
		color = pow(vec3(COLOR_SOULTORCH_R, COLOR_SOULTORCH_G, COLOR_SOULTORCH_B), vec3(2.2));
	}else if (materialID == MATID_AMETHYST){
		color = pow(vec3(COLOR_AMETHYST_R, COLOR_AMETHYST_G, COLOR_AMETHYST_B), vec3(2.2));
	}else if (materialID == MATID_FIRE){
		color = pow(vec3(COLOR_FIRE_R, COLOR_FIRE_G, COLOR_FIRE_B), vec3(2.2));
	}else if (materialID == MATID_ENDROD){
		color = pow(vec3(COLOR_ENDROD_R, COLOR_ENDROD_G, COLOR_ENDROD_B), vec3(2.2));
	}

	return color * BlocklightFromLightmap(0.5);
}

// Physical block light for a lightmap value
vec3 Blocklight(vec2 lightmap){
	// Blocklight color temperature
	vec3 warmColor = pow(vec3(COLOR_TORCH_R, COLOR_TORCH_G, COLOR_TORCH_B), vec3(2.2));
	return warmColor * pow(lightmap.x, 2.0) * BLOCKLIGHT_BRIGHTNESS;
}

#endif