#include "$ENGINE$\GBufferInput.bslinc"
#include "$ENGINE$\PerCameraData.bslinc"
#include "$ENGINE$\LightingCommon.bslinc"

mixin DeferredLightCommon
{
	mixin GBufferInput;
	mixin PerCameraData;
	mixin LightingCommon;

	depth
	{
		write = false;
		
		#ifdef INSIDE_GEOMETRY
		read = false;
		#else
		read = true;
		#endif
	};
	
	blend
	{
		target
		{
			enabled = true;
			color = { one, one, add };
			writemask = RGB;			
		};
	};
	
	raster
	{
		#ifdef INSIDE_GEOMETRY
		cull = cw;
		#else
		cull = ccw;
		#endif
	};

	code
	{
		cbuffer PerLight
		{
			// x, y, z - World position of the light
			// w - Radius of the area light source, zero if not an area light
			float4 gLightPositionAndSrcRadius;
			float4 gLightColorAndLuminance;
			// x - outerAngle in radians, y - cos(outerAngle), z - 1.0f/(cos(innerAngle) - cos(outerAngle)), w - inverse light attenuation radius
			float4 gLightSpotAnglesAndSqrdInvAttRadius;
			float4 gLightDirectionAndAttRadius;
			// xyz - light position shifted in order to adjust for area spot lights
			// w - light type -> Directional = 0, Radial = >0, Spot = >0.5
			float4 gShiftedLightPositionAndType;
			
			// x - Num sides (zero for radial lights)
			// y - Num slices (zero for radial lights)
			// z - Sphere radius for radial lights
			// w - Cone radius for spot lights
			float4 gLightGeometry; 
			float4x4 gMatConeTransform;
		}		

		LightData getLightData()
		{
			LightData output;
			
			output.position = gLightPositionAndSrcRadius.xyz;
			output.attRadius = gLightDirectionAndAttRadius.w;
			output.direction = gLightDirectionAndAttRadius.xyz;
			output.luminance = gLightColorAndLuminance.w;
			output.spotAngles = gLightSpotAnglesAndSqrdInvAttRadius.xyz;
			output.attRadiusSqrdInv = gLightSpotAnglesAndSqrdInvAttRadius.w;
			output.color = gLightColorAndLuminance.rgb;
			output.srcRadius = gLightPositionAndSrcRadius.w;
			output.shiftedLightPosition = gShiftedLightPositionAndType.rgb;

			return output;
		}
		
		#if MSAA_COUNT > 1
		Texture2DMS<float4> gLightOcclusionTex;
		#else
		Texture2D<float4> gLightOcclusionTex;
		#endif
	};
};