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Adding transparency support

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Dynamitos
2024-06-20 21:57:26 +02:00
parent 2dc9d57c71
commit bd63b14260
27 changed files with 578 additions and 282 deletions
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res/shaders/DepthCullingTask.slang
+63 -47
View File
@@ -1,5 +1,6 @@
import Common;
import Scene;
import Bounding;
groupshared MeshPayload p;
groupshared uint head;
@@ -7,6 +8,7 @@ groupshared MeshData mesh;
groupshared InstanceData instance;
groupshared Frustum viewFrustum;
groupshared float4x4 modelViewProjection;
groupshared bool meshVisible;
struct DepthData
{
@@ -16,6 +18,60 @@ struct DepthData
ParameterBlock<DepthData> pDepthAttachment;
bool isBoxVisible(AABB bounding)
{
uint2 mipDimensions = uint2((uint(pViewParams.screenDimensions.x) + BLOCK_SIZE - 1) / BLOCK_SIZE, (uint(pViewParams.screenDimensions.y) + BLOCK_SIZE - 1) / BLOCK_SIZE);
// 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) / BLOCK_SIZE;
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);
}
}
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)
{
mipOffset += mipDimensions.x * mipDimensions.y;
mipDimensions = uint2(mipDimensions.x + 1, mipDimensions.y + 1) / 2;
screenCornerMin /= 2;
screenCornerMax /= 2;
}
// now we sample 4 texels from the depth at the calculated mip level, this should give us the screen extent of the meshlet
float d1 = pDepthAttachment.buffer[mipOffset + (screenCornerMin.y * mipDimensions.x) + screenCornerMin.x];
float d2 = pDepthAttachment.buffer[mipOffset + (screenCornerMin.y * mipDimensions.x) + screenCornerMax.x];
float d3 = pDepthAttachment.buffer[mipOffset + (screenCornerMax.y * mipDimensions.x) + screenCornerMin.x];
float d4 = pDepthAttachment.buffer[mipOffset + (screenCornerMax.y * mipDimensions.x) + screenCornerMax.x];
// we want to check if the minimum depth (the value farthest away) is smaller than the maximum bounding box depth
// otherwise, there is no way for the meshlet to be visible
float d = min(min(d1, d2), min(d3, d4));
if(d < maxDepth)
{
return true;
}
return false;
}
[numthreads(TASK_GROUP_SIZE, 1, 1)]
[shader("amplification")]
void taskMain(
@@ -43,8 +99,13 @@ void taskMain(
viewFrustum.sides[1] = computePlane(origin, corners[1], corners[3]);
viewFrustum.sides[2] = computePlane(origin, corners[0], corners[1]);
viewFrustum.sides[3] = computePlane(origin, corners[3], corners[2]);
meshVisible = isBoxVisible(mesh.bounding);
}
GroupMemoryBarrierWithGroupSync();
if(!meshVisible)
{
return;
}
for (uint i = threadID; i < mesh.numMeshlets; i += TASK_GROUP_SIZE)
{
uint m = p.meshletOffset + i;
@@ -57,53 +118,8 @@ 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))
{
uint2 mipDimensions = uint2((uint(pViewParams.screenDimensions.x) + BLOCK_SIZE - 1) / BLOCK_SIZE, (uint(pViewParams.screenDimensions.y) + BLOCK_SIZE - 1) / BLOCK_SIZE);
// 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(meshlet.bounding.min.x, meshlet.bounding.min.y, meshlet.bounding.min.z, 1.0f);
corners[1] = float4(meshlet.bounding.min.x, meshlet.bounding.min.y, meshlet.bounding.max.z, 1.0f);
corners[2] = float4(meshlet.bounding.min.x, meshlet.bounding.max.y, meshlet.bounding.min.z, 1.0f);
corners[3] = float4(meshlet.bounding.min.x, meshlet.bounding.max.y, meshlet.bounding.max.z, 1.0f);
corners[4] = float4(meshlet.bounding.max.x, meshlet.bounding.min.y, meshlet.bounding.min.z, 1.0f);
corners[5] = float4(meshlet.bounding.max.x, meshlet.bounding.min.y, meshlet.bounding.max.z, 1.0f);
corners[6] = float4(meshlet.bounding.max.x, meshlet.bounding.max.y, meshlet.bounding.min.z, 1.0f);
corners[7] = float4(meshlet.bounding.max.x, meshlet.bounding.max.y, meshlet.bounding.max.z, 1.0f);
for(uint i = 0; i < 8; ++i)
{
float4 clipCorner = mul(modelViewProjection, corners[i]);
float4 screenCorner = clipToScreen(clipCorner) / BLOCK_SIZE;
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);
}
}
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)
{
mipOffset += mipDimensions.x * mipDimensions.y;
mipDimensions = uint2(mipDimensions.x + 1, mipDimensions.y + 1) / 2;
screenCornerMin /= 2;
screenCornerMax /= 2;
}
// now we sample 4 texels from the depth at the calculated mip level, this should give us the screen extent of the meshlet
float d1 = pDepthAttachment.buffer[mipOffset + (screenCornerMin.y * mipDimensions.x) + screenCornerMin.x];
float d2 = pDepthAttachment.buffer[mipOffset + (screenCornerMin.y * mipDimensions.x) + screenCornerMax.x];
float d3 = pDepthAttachment.buffer[mipOffset + (screenCornerMax.y * mipDimensions.x) + screenCornerMin.x];
float d4 = pDepthAttachment.buffer[mipOffset + (screenCornerMax.y * mipDimensions.x) + screenCornerMax.x];
// we want to check if the minimum depth (the value farthest away) is smaller than the maximum bounding box depth
// otherwise, there is no way for the meshlet to be visible
float d = min(min(d1, d2), min(d3, d4));
// this is technically not correct, as the mipmap is generated with a linear filter, but we actually would need a min filter, but whatever
if(d < maxDepth)
// if the meshlet bounding box is behind the cached depth buffer, we skip
if(isBoxVisible(meshlet.bounding))
{
uint index;
InterlockedAdd(head, 1, index);