BansheeEngine/Data/Raw/Engine/Includes/LightingCommon.bslinc

Technique
 : base("LightingCommon") =
{
	Language = "HLSL11";
	
	Pass =
	{
		Common = 
		{
			#define PI 3.1415926
			#define HALF_PI 1.5707963
			
			struct LightData
			{
				float3 position;
				float radius;
				float3 direction;
				float intensity;
				float3 spotAngles;
				float radiusSqrdInv;
				float3 color;
			};
			
			float convertFromDeviceZ(float deviceZ)
			{
				return (1.0f / (deviceZ + gDeviceZToWorldZ.y)) * gDeviceZToWorldZ.x;
			}
			
			float getSpotAttenuation(float3 worldPosToLight, float3 direction, float3 angles)
			{
				float output = saturate((dot(-worldPosToLight, direction) - angles.y) * angles.z);
				return output * output;
			}			
			
			float3 getDirLightContibution(SurfaceData surfaceData, LightData lightData)
			{
				float3 N = surfaceData.worldNormal.xyz;
				float3 L = -lightData.direction;
				
				float NoL = saturate(dot(N, L)); // TODO - Add bias here?
				return lightData.color * lightData.intensity * NoL;
			}
			
			float3 getPointLightContribution(float3 L, float3 worldPosition, SurfaceData surfaceData, LightData lightData)
			{
				float3 N = surfaceData.worldNormal.xyz;
				
				float distanceSqrd = dot(L, L);
				float distanceAttenuation = 1/(distanceSqrd + 1);
				
				L = normalize(L);
				float NoL = saturate(dot(N, L)); // TODO - Add bias here?

				float radiusAttenuation = distanceSqrd * lightData.radiusSqrdInv;
				radiusAttenuation *= radiusAttenuation;
				radiusAttenuation = saturate(1.0f - radiusAttenuation);
				radiusAttenuation *= radiusAttenuation;

				float attenuation = distanceAttenuation * radiusAttenuation;
				return lightData.color * lightData.intensity * (NoL * attenuation);
			}
			
			float3 getPointLightContribution(float3 worldPosition, SurfaceData surfaceData, LightData lightData)
			{
				float3 L = lightData.position - worldPosition;
				
				return getPointLightContribution(L, worldPosition, surfaceData, lightData);
			}
			
			float3 getSpotLightContribution(float3 worldPosition, SurfaceData surfaceData, LightData lightData)
			{
				float3 L = lightData.position - worldPosition;
				float3 pointLightContribution = getPointLightContribution(L, worldPosition, surfaceData, lightData);
				float spotFalloff = getSpotAttenuation(L, lightData.direction, lightData.spotAngles);
				
				return pointLightContribution * spotFalloff;
			}
		};
	};
};

Technique
 : base("LightingCommon") =
{
	Language = "GLSL";
	
	Pass =
	{
		Common = 
		{
			#define PI 3.1415926
			#define HALF_PI 1.5707963
			
			struct LightData
			{
				vec3 position;
				float radius;
				vec3 direction;
				float intensity;
				vec3 spotAngles;
				float radiusSqrdInv;
				vec3 color;
			};
			
			float convertFromDeviceZ(float deviceZ)
			{
				return (1.0f / (deviceZ + gDeviceZToWorldZ.y)) * gDeviceZToWorldZ.x;	
			}
						
			float getSpotAttenuation(vec3 worldPosToLight, vec3 direction, vec3 angles)
			{
				float atten = clamp((dot(-worldPosToLight, direction) - angles.y) * angles.z, 0.0, 1.0);
				return atten * atten;
			}
			
			vec3 getDirLightContibution(SurfaceData surfaceData, LightData lightData)
			{
				vec3 N = surfaceData.worldNormal.xyz;
				vec3 L = -lightData.direction;
				
				float NoL = clamp(dot(N, L), 0.0, 1.0); // TODO - Add bias here?
				return lightData.color * lightData.intensity * NoL;
			}
			
			vec3 getPointLightContribution(vec3 L, vec3 worldPosition, SurfaceData surfaceData, LightData lightData)
			{
				vec3 N = surfaceData.worldNormal.xyz;

				float distanceSqrd = dot(L, L);
				float distanceAttenuation = 1/(distanceSqrd + 1);
				
				L = normalize(L);
				float NoL = clamp(dot(N, L), 0.0, 1.0); // TODO - Add bias here?

				float radiusAttenuation = distanceSqrd * lightData.radiusSqrdInv;
				radiusAttenuation *= radiusAttenuation;
				radiusAttenuation = clamp(1.0f - radiusAttenuation, 0.0, 1.0);
				radiusAttenuation *= radiusAttenuation;
				
				float attenuation = distanceAttenuation * radiusAttenuation;
				return lightData.color * lightData.intensity * ((NoL * attenuation));
			}
			
			vec3 getPointLightContribution(vec3 worldPosition, SurfaceData surfaceData, LightData lightData)
			{
				vec3 L = lightData.position - worldPosition;
				return getPointLightContribution(L, worldPosition, surfaceData, lightData);
			}
			
			vec3 getSpotLightContribution(vec3 worldPosition, SurfaceData surfaceData, LightData lightData)
			{
				vec3 L = lightData.position - worldPosition;
				vec3 pointLightContribution = getPointLightContribution(L, worldPosition, surfaceData, lightData);
				float spotFalloff = getSpotAttenuation(L, lightData.direction, lightData.spotAngles);
				
				return pointLightContribution * spotFalloff;
			}
		};
	};
};