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Fix DDGI probes scrolling to properly handle bigger scroll deltas

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This commit is contained in:
Wojtek Figat
2024-06-13 17:04:29 +02:00
parent 5c5fad6bb4
commit 2f688892ea
3 changed files with 42 additions and 28 deletions
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32
Source/Engine/Renderer/GI/DynamicDiffuseGlobalIllumination.cpp
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@@ -67,14 +67,12 @@ public:
Float3 ProbesOrigin;
float ProbesSpacing = 0.0f;
Int3 ProbeScrollOffsets;
Int3 ProbeScrollDirections;
Int3 ProbeScrollClears;
void Clear()
{
ProbesOrigin = Float3::Zero;
ProbeScrollOffsets = Int3::Zero;
ProbeScrollDirections = Int3::Zero;
ProbeScrollClears = Int3::Zero;
}
} Cascades[4];
@@ -400,6 +398,7 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
const uint64 cascadeFrequencies[] = { 2, 3, 5, 7 };
//const uint64 cascadeFrequencies[] = { 1, 2, 3, 5 };
//const uint64 cascadeFrequencies[] = { 1, 1, 1, 1 };
//const uint64 cascadeFrequencies[] = { 10, 10, 10, 10 };
bool cascadeSkipUpdate[4];
for (int32 cascadeIndex = 0; cascadeIndex < cascadesCount; cascadeIndex++)
{
@@ -413,16 +412,6 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
continue;
auto& cascade = ddgiData.Cascades[cascadeIndex];
// Reset the volume origin and scroll offsets for each axis once it overflows
for (int32 axis = 0; axis < 3; axis++)
{
if (cascade.ProbeScrollOffsets.Raw[axis] != 0 && (cascade.ProbeScrollOffsets.Raw[axis] % ddgiData.ProbeCounts.Raw[axis] == 0))
{
cascade.ProbesOrigin.Raw[axis] += (float)ddgiData.ProbeCounts.Raw[axis] * cascade.ProbesSpacing * (float)cascade.ProbeScrollDirections.Raw[axis];
cascade.ProbeScrollOffsets.Raw[axis] = 0;
}
}
// Calculate the count of grid cells between the view origin and the scroll anchor
const Float3 volumeOrigin = cascade.ProbesOrigin + Float3(cascade.ProbeScrollOffsets) * cascade.ProbesSpacing;
const Float3 translation = viewOrigins[cascadeIndex] - volumeOrigin;
@@ -432,7 +421,24 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
const int32 scroll = value >= 0.0f ? (int32)Math::Floor(value) : (int32)Math::Ceil(value);
cascade.ProbeScrollOffsets.Raw[axis] += scroll;
cascade.ProbeScrollClears.Raw[axis] = scroll;
cascade.ProbeScrollDirections.Raw[axis] = translation.Raw[axis] >= 0.0f ? 1 : -1;
}
// Shift the volume origin based on scroll offsets for each axis once it overflows
for (int32 axis = 0; axis < 3; axis++)
{
// different volume scroll that preserves the scroll offset delta relative to the probe count
const int32 probeCount = ddgiData.ProbeCounts.Raw[axis];
int32& scrollOffset = cascade.ProbeScrollOffsets.Raw[axis];
while (scrollOffset >= probeCount)
{
cascade.ProbesOrigin.Raw[axis] += cascade.ProbesSpacing * probeCount;
scrollOffset -= probeCount;
}
while (scrollOffset <= -probeCount)
{
cascade.ProbesOrigin.Raw[axis] -= cascade.ProbesSpacing * probeCount;
scrollOffset += probeCount;
}
}
}