// MinecraftPT — Held Light
// Torch in hand / flashlight illumination.

#ifndef HELDLIGHT_GLSL
#define HELDLIGHT_GLSL

// Physical held light: torches held in hand or flashlight
vec3 GetHeldLight(vec3 worldPos, vec3 worldNormal, out float heldLightShadow){
	vec3 result = vec3(0.0);
	heldLightShadow = 1.0;

	#ifdef HELDLIGHT_MODE
		#if HELDLIGHT_MODE >= 1
			// Torch in hand position (roughly 0.4, -0.4, 0.6 relative to camera)
			vec3 heldPos = gbufferModelViewInverse[3].xyz + cameraPosition;
			vec3 toLight = heldPos - worldPos;
			float dist = length(toLight);
			vec3 dir = toLight / max(dist, 1e-4);

			float intensity = exp(-dist * dist * HELDLIGHT_FALLOFF) * HELDLIGHT_BRIGHTNESS;
			float NdotL = max(dot(worldNormal, dir), 0.0);

			vec3 color = pow(vec3(COLOR_TORCH_R, COLOR_TORCH_G, COLOR_TORCH_B), vec3(2.2));

			result = color * intensity * NdotL;

			#ifdef HELDLIGHT_SHADOW
				// Simple ray shadow for held light (short distance)
				heldLightShadow = SimpleShadowTracing(WorldToVoxel(worldPos + worldNormal * 0.1), dir);
			#endif
		#endif
	#endif

	return result;
}

#endif