void BuildGPULightVolumes(HDCamera hdCamera, HDRayTracingLights rayTracingLights)
{
int totalNumLights = rayTracingLights.lightCount;
// Make sure the light volume buffer has the right size
if (m_LightVolumesCPUArray == null || totalNumLights != m_LightVolumesCPUArray.Length)
{
ResizeVolumeBuffer(totalNumLights);
}
// Set Light volume data to the CPU buffer
punctualLightCount = 0;
areaLightCount = 0;
envLightCount = 0;
totalLightCount = 0;
int realIndex = 0;
HDLightRenderDatabase lightEntities = HDLightRenderDatabase.instance;
for (int lightIdx = 0; lightIdx < rayTracingLights.hdLightEntityArray.Count; ++lightIdx)
{
int dataIndex = lightEntities.GetEntityDataIndex(rayTracingLights.hdLightEntityArray[lightIdx]);
HDAdditionalLightData currentLight = lightEntities.hdAdditionalLightData[dataIndex];
// When the user deletes a light source in the editor, there is a single frame where the light is null before the collection of light in the scene is triggered
// the workaround for this is simply to not add it if it is null for that invalid frame
if (currentLight != null)
{
Light light = currentLight.gameObject.GetComponent <Light>();
if (light == null || !light.enabled)
{
continue;
}
// If the light is flagged as baked and has been effectively been baked, we need to skip it and not add it to the light cluster
if (light.bakingOutput.lightmapBakeType == LightmapBakeType.Baked && light.bakingOutput.isBaked)
{
continue;
}
// If this light should not be included when ray tracing is active on the camera, skip it
if (hdCamera.frameSettings.IsEnabled(FrameSettingsField.RayTracing) && !currentLight.includeForRayTracing)
{
continue;
}
// Reserve space in the cookie atlas
m_RenderPipeline.ReserveCookieAtlasTexture(currentLight, light, currentLight.type);
// Compute the camera relative position
Vector3 lightPositionRWS = currentLight.gameObject.transform.position;
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
lightPositionRWS -= hdCamera.camera.transform.position;
}
// Grab the light range
float lightRange = light.range;
if (currentLight.type != HDLightType.Area)
{
m_LightVolumesCPUArray[realIndex].range = new Vector3(lightRange, lightRange, lightRange);
m_LightVolumesCPUArray[realIndex].position = lightPositionRWS;
m_LightVolumesCPUArray[realIndex].active = (currentLight.gameObject.activeInHierarchy ? 1 : 0);
m_LightVolumesCPUArray[realIndex].lightIndex = (uint)lightIdx;
m_LightVolumesCPUArray[realIndex].shape = 0;
m_LightVolumesCPUArray[realIndex].lightType = 0;
punctualLightCount++;
}
else
{
// let's compute the oobb of the light influence volume first
Vector3 oobbDimensions = new Vector3(currentLight.shapeWidth + 2 * lightRange, currentLight.shapeHeight + 2 * lightRange, lightRange); // One-sided
Vector3 extents = 0.5f * oobbDimensions;
Vector3 oobbCenter = lightPositionRWS + extents.z * currentLight.gameObject.transform.forward;
// Let's now compute an AABB that matches the previously defined OOBB
OOBBToAABBBounds(oobbCenter, extents, currentLight.gameObject.transform.up, currentLight.gameObject.transform.right, currentLight.gameObject.transform.forward, ref bounds);
// Fill the volume data
m_LightVolumesCPUArray[realIndex].range = bounds.extents;
m_LightVolumesCPUArray[realIndex].position = bounds.center;
m_LightVolumesCPUArray[realIndex].active = (currentLight.gameObject.activeInHierarchy ? 1 : 0);
m_LightVolumesCPUArray[realIndex].lightIndex = (uint)lightIdx;
m_LightVolumesCPUArray[realIndex].shape = 1;
m_LightVolumesCPUArray[realIndex].lightType = 1;
areaLightCount++;
}
realIndex++;
}
}
int indexOffset = realIndex;
// Set Env Light volume data to the CPU buffer
for (int lightIdx = 0; lightIdx < rayTracingLights.reflectionProbeArray.Count; ++lightIdx)
{
HDProbe currentEnvLight = rayTracingLights.reflectionProbeArray[lightIdx];
if (currentEnvLight != null)
{
// If the reflection probe is disabled, we should not be adding it
if (!currentEnvLight.enabled)
{
continue;
}
// If the reflection probe is not baked yet.
if (!currentEnvLight.HasValidRenderedData())
{
continue;
}
// Compute the camera relative position
Vector3 probePositionRWS = currentEnvLight.influenceToWorld.GetColumn(3);
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
probePositionRWS -= hdCamera.camera.transform.position;
}
if (currentEnvLight.influenceVolume.shape == InfluenceShape.Sphere)
{
m_LightVolumesCPUArray[lightIdx + indexOffset].shape = 0;
m_LightVolumesCPUArray[lightIdx + indexOffset].range = new Vector3(currentEnvLight.influenceVolume.sphereRadius, currentEnvLight.influenceVolume.sphereRadius, currentEnvLight.influenceVolume.sphereRadius);
m_LightVolumesCPUArray[lightIdx + indexOffset].position = probePositionRWS;
}
else
{
m_LightVolumesCPUArray[lightIdx + indexOffset].shape = 1;
m_LightVolumesCPUArray[lightIdx + indexOffset].range = new Vector3(currentEnvLight.influenceVolume.boxSize.x / 2.0f, currentEnvLight.influenceVolume.boxSize.y / 2.0f, currentEnvLight.influenceVolume.boxSize.z / 2.0f);
m_LightVolumesCPUArray[lightIdx + indexOffset].position = probePositionRWS;
}
m_LightVolumesCPUArray[lightIdx + indexOffset].active = (currentEnvLight.gameObject.activeInHierarchy ? 1 : 0);
m_LightVolumesCPUArray[lightIdx + indexOffset].lightIndex = (uint)lightIdx;
m_LightVolumesCPUArray[lightIdx + indexOffset].lightType = 2;
envLightCount++;
}
}
totalLightCount = punctualLightCount + areaLightCount + envLightCount;
// Push the light volumes to the GPU
m_LightVolumeGPUArray.SetData(m_LightVolumesCPUArray);
}
void BuildLightData(CommandBuffer cmd, HDCamera hdCamera, HDRayTracingLights rayTracingLights, DebugDisplaySettings debugDisplaySettings)
{
// If no lights, exit
if (rayTracingLights.lightCount == 0)
{
ResizeLightDataBuffer(1);
return;
}
// Also we need to build the light list data
if (m_LightDataGPUArray == null || m_LightDataGPUArray.count != rayTracingLights.lightCount)
{
ResizeLightDataBuffer(rayTracingLights.lightCount);
}
m_LightDataCPUArray.Clear();
// Grab the shadow settings
var hdShadowSettings = hdCamera.volumeStack.GetComponent <HDShadowSettings>();
BoolScalableSetting contactShadowScalableSetting = HDAdditionalLightData.ScalableSettings.UseContactShadow(m_RenderPipeline.asset);
// Build the data for every light
HDLightRenderDatabase lightEntities = HDLightRenderDatabase.instance;
var processedLightEntity = new HDProcessedVisibleLight()
{
shadowMapFlags = HDProcessedVisibleLightsBuilder.ShadowMapFlags.None
};
var globalConfig = HDGpuLightsBuilder.CreateGpuLightDataJobGlobalConfig.Create(hdCamera, hdShadowSettings);
var shadowInitParams = m_RenderPipeline.currentPlatformRenderPipelineSettings.hdShadowInitParams;
for (int lightIdx = 0; lightIdx < rayTracingLights.hdLightEntityArray.Count; ++lightIdx)
{
// Grab the additinal light data to process
int dataIndex = lightEntities.GetEntityDataIndex(rayTracingLights.hdLightEntityArray[lightIdx]);
HDAdditionalLightData additionalLightData = lightEntities.hdAdditionalLightData[dataIndex];
LightData lightData = new LightData();
// When the user deletes a light source in the editor, there is a single frame where the light is null before the collection of light in the scene is triggered
// the workaround for this is simply to add an invalid light for that frame
if (additionalLightData == null)
{
m_LightDataCPUArray.Add(lightData);
continue;
}
// Evaluate all the light type data that we need
LightCategory lightCategory = LightCategory.Count;
GPULightType gpuLightType = GPULightType.Point;
LightVolumeType lightVolumeType = LightVolumeType.Count;
HDLightType lightType = additionalLightData.type;
HDRenderPipeline.EvaluateGPULightType(lightType, additionalLightData.spotLightShape, additionalLightData.areaLightShape, ref lightCategory, ref gpuLightType, ref lightVolumeType);
// Fetch the light component for this light
additionalLightData.gameObject.TryGetComponent(out lightComponent);
ref HDLightRenderData lightRenderData = ref lightEntities.GetLightDataAsRef(dataIndex);
// Build the processed light data that we need
processedLightEntity.dataIndex = dataIndex;
processedLightEntity.gpuLightType = gpuLightType;
processedLightEntity.lightType = additionalLightData.type;
processedLightEntity.distanceToCamera = (additionalLightData.transform.position - hdCamera.camera.transform.position).magnitude;
processedLightEntity.lightDistanceFade = HDUtils.ComputeLinearDistanceFade(processedLightEntity.distanceToCamera, lightRenderData.fadeDistance);
processedLightEntity.lightVolumetricDistanceFade = HDUtils.ComputeLinearDistanceFade(processedLightEntity.distanceToCamera, lightRenderData.volumetricFadeDistance);
processedLightEntity.isBakedShadowMask = HDRenderPipeline.IsBakedShadowMaskLight(lightComponent);
// Build a visible light
visibleLight.finalColor = LightUtils.EvaluateLightColor(lightComponent, additionalLightData);
visibleLight.range = lightComponent.range;
// This should be done explicitly, localToWorld matrix doesn't work here
localToWorldMatrix.SetColumn(3, lightComponent.gameObject.transform.position);
localToWorldMatrix.SetColumn(2, lightComponent.transform.forward);
localToWorldMatrix.SetColumn(1, lightComponent.transform.up);
localToWorldMatrix.SetColumn(0, lightComponent.transform.right);
visibleLight.localToWorldMatrix = localToWorldMatrix;
visibleLight.spotAngle = lightComponent.spotAngle;
int shadowIndex = additionalLightData.shadowIndex;
Vector3 lightDimensions = new Vector3(0.0f, 0.0f, 0.0f);
// Use the shared code to build the light data
HDGpuLightsBuilder.CreateGpuLightDataJob.ConvertLightToGPUFormat(
lightCategory, gpuLightType, globalConfig,
lightComponent.lightShadowCasterMode, lightComponent.bakingOutput,
visibleLight, processedLightEntity, lightRenderData, out var _, ref lightData);
m_RenderPipeline.gpuLightList.ProcessLightDataShadowIndex(cmd, shadowInitParams, lightType, lightComponent, additionalLightData, shadowIndex, ref lightData);
// We make the light position camera-relative as late as possible in order
// to allow the preceding code to work with the absolute world space coordinates.
Vector3 camPosWS = hdCamera.mainViewConstants.worldSpaceCameraPos;
HDRenderPipeline.UpdateLightCameraRelativetData(ref lightData, camPosWS);
// Set the data for this light
m_LightDataCPUArray.Add(lightData);
}
void CollectLightsForRayTracing(HDCamera hdCamera, ref bool transformDirty)
{
// fetch all the lights in the scene
HDLightRenderDatabase lightEntities = HDLightRenderDatabase.instance;
for (int lightIdx = 0; lightIdx < lightEntities.lightCount; ++lightIdx)
{
HDLightRenderEntity lightRenderEntity = lightEntities.lightEntities[lightIdx];
HDAdditionalLightData hdLight = lightEntities.hdAdditionalLightData[lightIdx];
if (hdLight != null && hdLight.enabled && hdLight != HDUtils.s_DefaultHDAdditionalLightData)
{
// Flag that needs to be overriden by the light and tells us if the light will need the RTAS
bool hasRayTracedShadows = false;
// Indicates that a transform has changed in our scene (mesh or light)
transformDirty |= hdLight.transform.hasChanged;
hdLight.transform.hasChanged = false;
switch (hdLight.type)
{
case HDLightType.Directional:
{
hasRayTracedShadows = hdLight.ShadowsEnabled() && hdLight.useScreenSpaceShadows && hdLight.useRayTracedShadows;
m_RayTracingLights.hdDirectionalLightArray.Add(hdLight);
}
break;
case HDLightType.Point:
case HDLightType.Spot:
{
hasRayTracedShadows = hdLight.ShadowsEnabled() && hdLight.useRayTracedShadows;
m_RayTracingLights.hdPointLightArray.Add(lightRenderEntity);
}
break;
case HDLightType.Area:
{
hasRayTracedShadows = hdLight.ShadowsEnabled() && hdLight.useRayTracedShadows;
switch (hdLight.areaLightShape)
{
case AreaLightShape.Rectangle:
m_RayTracingLights.hdRectLightArray.Add(lightRenderEntity);
break;
case AreaLightShape.Tube:
m_RayTracingLights.hdLineLightArray.Add(lightRenderEntity);
break;
//TODO: case AreaLightShape.Disc:
}
break;
}
}
// Check if there is a ray traced shadow in the scene
m_RayTracedShadowsRequired |= hasRayTracedShadows;
m_RayTracedContactShadowsRequired |= (hdLight.useContactShadow.@override && hdLight.rayTraceContactShadow);
}
}
// Add the lights to the structure
m_RayTracingLights.hdLightEntityArray.AddRange(m_RayTracingLights.hdPointLightArray);
m_RayTracingLights.hdLightEntityArray.AddRange(m_RayTracingLights.hdLineLightArray);
m_RayTracingLights.hdLightEntityArray.AddRange(m_RayTracingLights.hdRectLightArray);
// Process the lights
HDAdditionalReflectionData[] reflectionProbeArray = UnityEngine.GameObject.FindObjectsOfType <HDAdditionalReflectionData>();
for (int reflIdx = 0; reflIdx < reflectionProbeArray.Length; ++reflIdx)
{
HDAdditionalReflectionData reflectionProbe = reflectionProbeArray[reflIdx];
// Add it to the list if enabled
// Skip the probe if the probe has never rendered (in real time cases) or if texture is null
if (reflectionProbe != null &&
reflectionProbe.enabled &&
reflectionProbe.ReflectionProbeIsEnabled() &&
reflectionProbe.gameObject.activeSelf &&
reflectionProbe.HasValidRenderedData())
{
m_RayTracingLights.reflectionProbeArray.Add(reflectionProbe);
}
}
m_RayTracingLights.lightCount = m_RayTracingLights.hdPointLightArray.Count
+ m_RayTracingLights.hdLineLightArray.Count
+ m_RayTracingLights.hdRectLightArray.Count
+ m_RayTracingLights.reflectionProbeArray.Count;
}
