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optimize the clear head method from SetData to a CS kernel #11

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Merged
merged 3 commits into from
Sep 18, 2022
Merged

optimize the clear head method from SetData to a CS kernel #11

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9bb1443
opt clear head method from SetData to a CS kernel
SnowWindSaveYou Sep 15, 2022
ba10cbf
fix the problem on large screen
SnowWindSaveYou Sep 15, 2022
f921549
use two-dimensional thread groups to support larger resolutions and r…
happy-turtle Sep 18, 2022
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16 changes: 12 additions & 4 deletions Assets/OrderIndependentTransparency/Scripts/OitLinkedList.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,9 +12,12 @@ public class OitLinkedList : IOrderIndependentTransparency
private int bufferSize;
private int bufferStride;
private Material linkedListMaterial;
private uint[] resetTable;
private const int MAX_SORTED_PIXELS = 8;

private ComputeShader oitComputeUtils;
private int clearStartOffsetBufferKernel;
private int dispatchGroupSizeX, dispatchGroupSizeY;

public OitLinkedList(bool postProcess = false)
{
linkedListMaterial = new Material(Shader.Find("Hidden/LinkedListRendering"));
Expand All @@ -35,16 +38,21 @@ public OitLinkedList(bool postProcess = false)
startOffsetBuffer = new GraphicsBuffer(GraphicsBuffer.Target.Raw, bufferSizeHead, bufferStrideHead);
startOffsetBufferId = Shader.PropertyToID("StartOffsetBuffer");

resetTable = new uint[bufferSizeHead];
oitComputeUtils = Resources.Load<ComputeShader>("OitComputeUtils");
clearStartOffsetBufferKernel = oitComputeUtils.FindKernel("ClearStartOffsetBuffer");
oitComputeUtils.SetBuffer(clearStartOffsetBufferKernel, startOffsetBufferId, startOffsetBuffer);
oitComputeUtils.SetInt("bufferWidth", bufferWidth);
dispatchGroupSizeX = Mathf.CeilToInt(bufferWidth / 32.0f);
dispatchGroupSizeY = Mathf.CeilToInt(bufferHeight / 32.0f);
}

public void PreRender()
{
if (fragmentLinkBuffer == null || startOffsetBuffer == null || startOffsetBuffer.count != resetTable.Length)
if (fragmentLinkBuffer == null || startOffsetBuffer == null)
return;

//reset StartOffsetBuffer to zeros
startOffsetBuffer.SetData(resetTable);
oitComputeUtils.Dispatch(clearStartOffsetBufferKernel, dispatchGroupSizeX, dispatchGroupSizeY, 1);

// set buffers for rendering
Graphics.SetRandomWriteTarget(1, fragmentLinkBuffer);
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2 changes: 1 addition & 1 deletion Assets/OrderIndependentTransparency/Shaders/LinkedListCreation.cginc
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Expand Up @@ -16,7 +16,7 @@ RWByteAddressBuffer StartOffsetBuffer : register(u2);

void createFragmentEntry(float4 col, float3 pos, uint uCoverage) {
//Retrieve current Pixel count and increase counter
uint uPixelCount = FLBuffer.IncrementCounter();
uint uPixelCount = FLBuffer.IncrementCounter()+1;
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i leave first one empty for safer debug, otherwise it's easy to make a infinite loop and make my computer crash


//calculate bufferAddress
uint uStartOffsetAddress = 4 * (_ScreenParams.x * (pos.y - 0.5) + (pos.x - 0.5));
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10 changes: 10 additions & 0 deletions Assets/OrderIndependentTransparency/Shaders/Resources/OitComputeUtils.compute
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@@ -0,0 +1,10 @@
#pragma kernel ClearStartOffsetBuffer

RWByteAddressBuffer StartOffsetBuffer;
int bufferWidth;

[numthreads(32, 32, 1)]
void ClearStartOffsetBuffer (uint3 id: SV_DispatchThreadID)
{
StartOffsetBuffer.Store(4 * (bufferWidth * id.y + id.x), 0);
}
9 changes: 9 additions & 0 deletions Assets/OrderIndependentTransparency/Shaders/Resources/OitComputeUtils.compute.meta
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