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Adding view culling to non-depth culling variant

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Dynamitos
2024-06-25 11:21:56 +02:00
parent c352555b0b
commit 00bb6b3a96
10 changed files with 144 additions and 175 deletions
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res/shaders/DepthCullingTask.slang
+4 -21
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@@ -24,27 +24,8 @@ bool isBoxVisible(AABB bounding)
// now we calculate what mip level we need to only sample up to 4 texels covering the entire meshlet
uint2 screenCornerMin = mipDimensions;
uint2 screenCornerMax = uint2(0, 0);
// we use reverse depth, so higher values are closer
float maxDepth = 0;
{
float4 corners[8];
corners[0] = float4(bounding.min.x, bounding.min.y, bounding.min.z, 1.0f);
corners[1] = float4(bounding.min.x, bounding.min.y, bounding.max.z, 1.0f);
corners[2] = float4(bounding.min.x, bounding.max.y, bounding.min.z, 1.0f);
corners[3] = float4(bounding.min.x, bounding.max.y, bounding.max.z, 1.0f);
corners[4] = float4(bounding.max.x, bounding.min.y, bounding.min.z, 1.0f);
corners[5] = float4(bounding.max.x, bounding.min.y, bounding.max.z, 1.0f);
corners[6] = float4(bounding.max.x, bounding.max.y, bounding.min.z, 1.0f);
corners[7] = float4(bounding.max.x, bounding.max.y, bounding.max.z, 1.0f);
for(uint i = 0; i < 8; ++i)
{
float4 clipCorner = mul(modelViewProjection, corners[i]);
float4 screenCorner = clipToScreen(clipCorner);
screenCornerMin = uint2(min(screenCornerMin.x, uint(screenCorner.x)), min(screenCornerMin.y, uint(screenCorner.y)));
screenCornerMax = uint2(max(screenCornerMax.x, uint(screenCorner.x)), max(screenCornerMax.y, uint(screenCorner.y)));
maxDepth = max(maxDepth, screenCorner.z);
}
}
// lower values are closer
float maxDepth = bounding.projectScreenDepth(modelViewProjection, screenCornerMin, screenCornerMax);
uint mipOffset = 0;
// in theory this wouldnt work if no corner was in screen, as min would be greater that max, however we verified that with view culling
while(screenCornerMax.x - screenCornerMin.x > 1 || screenCornerMax.y - screenCornerMin.y > 1)
@@ -118,8 +99,10 @@ void taskMain(
// if the meshlet is outside of the frustum, we skip it since we cant do depth culling anyways
if(meshlet.bounding.insideFrustum(viewFrustum))
{
#ifdef DEPTH_CULLING
// if the meshlet bounding box is behind the cached depth buffer, we skip
if(isBoxVisible(meshlet.bounding))
#endif
{
uint index;
InterlockedAdd(head, 1, index);