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Arm: Optimize away unnecessary clear empty RenderPass (Vulkan) in 2DRP. #4149

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Arm: Optimize away unnecessary clear empty RenderPass (Vulkan) in 2DRP. #4149

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Arm: Optimize away early empty clear RenderPass for CameraTarget. Scr…
SergioAlapontARM Apr 12, 2021
86dcb24
Merge branch 'master' into Arm_Optimize_EarlyClear2DRP
unity-cchu Sep 21, 2021
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9 changes: 8 additions & 1 deletion com.unity.render-pipelines.universal/Runtime/2D/Passes/Render2DLightingPass.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ public Render2DLightingPass(Renderer2DData rendererData, Material blitMaterial,
m_Renderer2DData = rendererData;
m_BlitMaterial = blitMaterial;
m_SamplingMaterial = samplingMaterial;
overrideCameraClear = true;

m_CameraSortingLayerBoundsIndex = GetCameraSortingLayerBoundsIndex();
}
Expand Down Expand Up @@ -235,12 +236,18 @@ private int DrawLayerBatches(
var blendStylesCount = m_Renderer2DData.lightBlendStyles.Length;
using (new ProfilingScope(cmd, m_ProfilingDrawRenderers))
{
// Clear the target only when the first layer is rendered and this is the base camera (not camera overlay)
bool needsClear = ((startIndex == 0) && (renderingData.cameraData.renderType == CameraRenderType.Base));
RenderBufferStoreAction initialStoreAction;
if (msaaEnabled)
initialStoreAction = resolveDuringBatch < startIndex ? RenderBufferStoreAction.Resolve : RenderBufferStoreAction.StoreAndResolve;
else
initialStoreAction = RenderBufferStoreAction.Store;
cmd.SetRenderTarget(colorAttachment, RenderBufferLoadAction.Load, initialStoreAction, depthAttachment, RenderBufferLoadAction.Load, initialStoreAction);
cmd.SetRenderTarget(colorAttachment, RenderBufferLoadAction.DontCare, initialStoreAction, depthAttachment, RenderBufferLoadAction.DontCare, initialStoreAction);
if (needsClear)
{
CoreUtils.ClearRenderTarget(cmd, ClearFlag.All, CoreUtils.ConvertSRGBToActiveColorSpace(renderingData.cameraData.camera.backgroundColor));
}

for (var i = startIndex; i < startIndex + batchesDrawn; i++)
{
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3 changes: 3 additions & 0 deletions com.unity.render-pipelines.universal/Runtime/Passes/ScriptableRenderPass.cs
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Expand Up @@ -207,6 +207,8 @@ public Color clearColor
/// </summary>
protected internal ProfilingSampler profilingSampler { get; set; }
internal bool overrideCameraTarget { get; set; }
// Use this flag to override the clear logic in ScriptableRenderer and assume responsibility of manually clearing the pass's targets (Color & Depth).
internal bool overrideCameraClear { get; set; }
internal bool isBlitRenderPass { get; set; }

internal bool useNativeRenderPass { get; set; }
Expand Down Expand Up @@ -253,6 +255,7 @@ public ScriptableRenderPass()
m_ClearFlag = ClearFlag.None;
m_ClearColor = Color.black;
overrideCameraTarget = false;
overrideCameraClear = false;
isBlitRenderPass = false;
profilingSampler = new ProfilingSampler($"Unnamed_{nameof(ScriptableRenderPass)}");
useNativeRenderPass = true;
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2 changes: 1 addition & 1 deletion com.unity.render-pipelines.universal/Runtime/ScriptableRenderer.cs
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Expand Up @@ -970,7 +970,7 @@ void ExecuteRenderPass(ScriptableRenderContext context, ScriptableRenderPass ren
void SetRenderPassAttachments(CommandBuffer cmd, ScriptableRenderPass renderPass, ref CameraData cameraData)
{
Camera camera = cameraData.camera;
ClearFlag cameraClearFlag = GetCameraClearFlag(ref cameraData);
ClearFlag cameraClearFlag = renderPass.overrideCameraClear ? ClearFlag.None : GetCameraClearFlag(ref cameraData);
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in 2D renderer you never care about camera clear flags? In this case I’d rather suggest to add logic for 2D renderer to override functionality of GetCameraClearFlags instead of adding internal API to ScriptableRenderPass.

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So, any feedback on the injected passes issue?. As it stands, either with the current approach or if I override the camera clear flags to NONE in 2DRenderer, an earlier pass happening before Render2DLightingPass would render to a non-cleared camera RT and we would later clear such target overriding whatever was in there. I think the way to go here is to check whether there are ScriptableRenderFeatures queued and decide whether to allow clearing or not based on that. What do you think?

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@unity-cchu


// Invalid configuration - use current attachment setup
// Note: we only check color buffers. This is only technically correct because for shadowmaps and depth only passes
Expand Down