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Fix FSR2 jitter mismatch between projection and dispatch

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Kelsi 2026-03-08 21:10:36 -07:00
parent eccbfb6a5f
commit f6fce0f19a
1 changed files with 6 additions and 4 deletions
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10
src/rendering/renderer.cpp
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@ -1038,7 +1038,8 @@ void Renderer::beginFrame() {
ffxFsr2GetJitterOffset(&jitterX, &jitterY, static_cast<int32_t>(fsr2_.frameIndex % static_cast<uint32_t>(phaseCount)), phaseCount) == FFX_OK) {
float ndcJx = (2.0f * jitterX) / static_cast<float>(fsr2_.internalWidth);
float ndcJy = (2.0f * jitterY) / static_cast<float>(fsr2_.internalHeight);
camera->setJitter(ndcJx, ndcJy);
// Keep projection jitter and FSR dispatch jitter in sync.
camera->setJitter(fsr2_.jitterSign * ndcJx, fsr2_.jitterSign * ndcJy);
} else {
camera->setJitter(0.0f, 0.0f);
}
@ -1046,7 +1047,7 @@ void Renderer::beginFrame() {
const float jitterScale = 0.5f;
float jx = (halton(fsr2_.frameIndex + 1, 2) - 0.5f) * 2.0f * jitterScale / static_cast<float>(fsr2_.internalWidth);
float jy = (halton(fsr2_.frameIndex + 1, 3) - 0.5f) * 2.0f * jitterScale / static_cast<float>(fsr2_.internalHeight);
camera->setJitter(jx, jy);
camera->setJitter(fsr2_.jitterSign * jx, fsr2_.jitterSign * jy);
#endif
}
}
@ -4323,9 +4324,10 @@ void Renderer::dispatchAmdFsr2() {
L"FSR2_Output", FFX_RESOURCE_STATE_UNORDERED_ACCESS);
// Camera jitter is stored as NDC projection offsets; convert to render-pixel offsets.
// Do not apply jitterSign again here: it is already baked into camera jitter.
glm::vec2 jitterNdc = camera->getJitter();
desc.jitterOffset.x = fsr2_.jitterSign * jitterNdc.x * 0.5f * static_cast<float>(fsr2_.internalWidth);
desc.jitterOffset.y = fsr2_.jitterSign * jitterNdc.y * 0.5f * static_cast<float>(fsr2_.internalHeight);
desc.jitterOffset.x = jitterNdc.x * 0.5f * static_cast<float>(fsr2_.internalWidth);
desc.jitterOffset.y = jitterNdc.y * 0.5f * static_cast<float>(fsr2_.internalHeight);
desc.motionVectorScale.x = static_cast<float>(fsr2_.internalWidth) * fsr2_.motionVecScaleX;
desc.motionVectorScale.y = static_cast<float>(fsr2_.internalHeight) * fsr2_.motionVecScaleY;
desc.renderSize.width = fsr2_.internalWidth;