// Must return the first executed shadow request
public int UpdateShadowRequest(Camera camera, HDShadowInitParameters initParameters, HDShadowManager manager, VisibleLight visibleLight, CullResults cullResults, int lightIndex, out int shadowRequestCount)
{
int firstShadowRequestIndex = -1;
Vector3 cameraPos = camera.transform.position;
HDShadowSettings shadowSettings = VolumeManager.instance.stack.GetComponent <HDShadowSettings>();
shadowRequestCount = 0;
// When creating a new light, at the first frame, there is no AdditionalShadowData so we can't really render shadows
if (m_ShadowData == null)
{
return(-1);
}
// Create shadow requests array using the light type
if (shadowRequests == null || shadowRequests.Length != GetShadowRequestCount(shadowSettings))
{
int count = GetShadowRequestCount(shadowSettings);
shadowRequests = new HDShadowRequest[count];
for (int i = 0; i < count; i++)
{
shadowRequests[i] = new HDShadowRequest();
}
}
// If the shadow is too far away, we don't render it
if (m_Light.type != LightType.Directional && Vector3.Distance(cameraPos, transform.position) >= m_ShadowData.shadowFadeDistance)
{
return(-1);
}
Vector2 viewportSize = new Vector2(m_ShadowData.shadowResolution, m_ShadowData.shadowResolution);
if (initParameters.useDynamicViewportRescale && m_Light.type != LightType.Directional)
{
// resize viewport size by the normalized size of the light on screen
// When we will have access to the non screen clamped bounding sphere light size, we could use it to scale the shadow map resolution
// For the moment, this will be enough
viewportSize *= Mathf.Lerp(64f / viewportSize.x, 1f, visibleLight.range / (cameraPos - transform.position).magnitude);
viewportSize = Vector2.Max(new Vector2(64f, 64f) / viewportSize, viewportSize);
// Prevent flickering caused by the floating size of the viewport
viewportSize.x = Mathf.Round(viewportSize.x);
viewportSize.y = Mathf.Round(viewportSize.y);
}
viewportSize = Vector2.Max(viewportSize, new Vector2(16, 16));
for (int requestIndex = 0; requestIndex < shadowRequests.Length; requestIndex++)
{
var shadowRequest = shadowRequests[requestIndex];
Matrix4x4 invViewProjection = Matrix4x4.identity;
// Write per light type matrices, splitDatas and culling parameters
switch (m_Light.type)
{
case LightType.Point:
HDShadowUtils.ExtractPointLightData(m_Light.type, visibleLight, viewportSize, shadowNearPlane, m_ShadowData.normalBiasMax, (uint)requestIndex, out shadowRequest.view, out invViewProjection, out shadowRequest.projection, out shadowRequest.deviceProjection, out shadowRequest.splitData);
break;
case LightType.Spot:
HDShadowUtils.ExtractSpotLightData(m_Light.type, spotLightShape, shadowNearPlane, aspectRatio, shapeWidth, shapeHeight, visibleLight, viewportSize, m_ShadowData.normalBiasMax, out shadowRequest.view, out invViewProjection, out shadowRequest.projection, out shadowRequest.deviceProjection, out shadowRequest.splitData);
break;
case LightType.Directional:
Vector4 cullingSphere;
float nearPlaneOffset = QualitySettings.shadowNearPlaneOffset;
HDShadowUtils.ExtractDirectionalLightData(visibleLight, viewportSize, (uint)requestIndex, shadowSettings.cascadeShadowSplitCount, shadowSettings.cascadeShadowSplits, nearPlaneOffset, cullResults, lightIndex, out shadowRequest.view, out invViewProjection, out shadowRequest.projection, out shadowRequest.deviceProjection, out shadowRequest.splitData);
cullingSphere = shadowRequest.splitData.cullingSphere;
// Camera relative for directional light culling sphere
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
cullingSphere.x -= cameraPos.x;
cullingSphere.y -= cameraPos.y;
cullingSphere.z -= cameraPos.z;
}
manager.UpdateCascade(requestIndex, cullingSphere, shadowSettings.cascadeShadowBorders[requestIndex]);
break;
case LightType.Area:
HDShadowUtils.ExtractAreaLightData(visibleLight, lightTypeExtent, out shadowRequest.view, out invViewProjection, out shadowRequest.projection, out shadowRequest.deviceProjection, out shadowRequest.splitData);
break;
}
// Assign all setting common to every lights
SetCommonShadowRequestSettings(shadowRequest, cameraPos, invViewProjection, viewportSize, lightIndex);
int shadowRequestIndex = manager.AddShadowRequest(shadowRequest);
// Store the first shadow request id to return it
if (firstShadowRequestIndex == -1)
{
firstShadowRequestIndex = shadowRequestIndex;
}
shadowRequestCount++;
}
return(firstShadowRequestIndex);
}
int GetShadowRequestCount(HDShadowSettings shadowSettings)
{
return((m_Light.type == LightType.Point) ? 6 : (m_Light.type == LightType.Directional) ? shadowSettings.cascadeShadowSplitCount : 1);
}