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Minor DDGI optimization

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This commit is contained in:
Wojciech Figat
2022-06-06 13:13:36 +02:00
parent 1f1ed2bf60
commit c147e3bff4
3 changed files with 19 additions and 20 deletions
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33
Source/Shaders/GI/DDGI.shader
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@@ -236,9 +236,7 @@ void CS_UpdateProbes(uint3 DispatchThreadId : SV_DispatchThreadID, uint GroupInd
uint coord = (probeCount + (scrollDirection ? (scrollOffset - 1) : (scrollOffset % probeCount))) % probeCount;
if (probeCoords[planeIndex] == coord)
{
// Clear probe and return
//RWOutput[outputCoords] = float4(0, 0, 0, 0);
//if (!skip) RWOutput[outputCoords] = float4(0, 0, 0, 0);
// Skip scrolled probes
skip = true;
}
}
@@ -249,23 +247,20 @@ void CS_UpdateProbes(uint3 DispatchThreadId : SV_DispatchThreadID, uint GroupInd
if (probeState == DDGI_PROBE_STATE_INACTIVE)
skip = true;
// Calculate octahedral projection for probe (unwraps spherical projection into a square)
float2 octahedralCoords = GetOctahedralCoords(DispatchThreadId.xy, DDGI_PROBE_RESOLUTION);
float3 octahedralDirection = GetOctahedralDirection(octahedralCoords);
// Load trace rays results into shared memory to reuse across whole thread group
uint count = (uint)(ceil((float)(DDGI_TRACE_RAYS_LIMIT) / (float)(DDGI_PROBE_RESOLUTION * DDGI_PROBE_RESOLUTION)));
for (uint i = 0; i < count; i++)
if (!skip)
{
uint rayIndex = (GroupIndex * count) + i;
if (rayIndex >= DDGI.RaysCount)
break;
CachedProbesTraceRadiance[rayIndex] = ProbesTrace[uint2(rayIndex, probeIndex)];
CachedProbesTraceDirection[rayIndex] = GetProbeRayDirection(DDGI, rayIndex);
// Load trace rays results into shared memory to reuse across whole thread group
uint count = (uint)(ceil((float)(DDGI_TRACE_RAYS_LIMIT) / (float)(DDGI_PROBE_RESOLUTION * DDGI_PROBE_RESOLUTION)));
for (uint i = 0; i < count; i++)
{
uint rayIndex = (GroupIndex * count) + i;
if (rayIndex >= DDGI.RaysCount)
break;
CachedProbesTraceRadiance[rayIndex] = ProbesTrace[uint2(rayIndex, probeIndex)];
CachedProbesTraceDirection[rayIndex] = GetProbeRayDirection(DDGI, rayIndex);
}
}
GroupMemoryBarrierWithGroupSync();
// TODO: optimize probes updating to build indirect dispatch args and probes indices list before tracing rays and blending irradiance/distance
if (skip)
{
// Clear probe
@@ -273,6 +268,10 @@ void CS_UpdateProbes(uint3 DispatchThreadId : SV_DispatchThreadID, uint GroupInd
return;
}
// Calculate octahedral projection for probe (unwraps spherical projection into a square)
float2 octahedralCoords = GetOctahedralCoords(DispatchThreadId.xy, DDGI_PROBE_RESOLUTION);
float3 octahedralDirection = GetOctahedralDirection(octahedralCoords);
// Loop over rays
float4 result = float4(0, 0, 0, 0);
#if DDGI_PROBE_UPDATE_MODE == 0