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[Feat] (DirectVulkan, MG_Impl): GPU transform feedback primitive queries

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The TF primitive queries now ride VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT
pools when the device reports transformFeedbackQueries: each captured draw
is wrapped in a slot (shared between both GL targets when active
together), and results sum the (written, needed) pairs -
GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN from the first,
GL_PRIMITIVES_GENERATED from the second. This is exact through geometry
shaders, so KHR-GL33.transform_feedback.query_geometry_* pass; the CPU
accounting delta remains the fallback for backends without the feature.
This commit is contained in:
BZLZHH
2026-08-01 02:02:35 -04:00
parent f748a06632
commit b9a15aed61
7 changed files with 187 additions and 7 deletions
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MobileGL/MG_Backend/DirectVulkan/DirectVulkan.cpp
+33 -1
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@@ -1564,7 +1564,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
// records are shared (SharedPtr) with the owning pool's pending list,
// so deleting the query while results are still in flight is safe.
struct VulkanTimerQuery {
enum class Kind : Uint8 { Timer, Occlusion };
enum class Kind : Uint8 { Timer, Occlusion, XfbWritten, XfbGenerated };
Kind kind = Kind::Timer;
SharedPtr<VkTimerQueryManager::TimestampRecord> begin;
SharedPtr<VkTimerQueryManager::TimestampRecord> end;
@@ -1668,6 +1668,17 @@ namespace MobileGL::MG_Backend::DirectVulkan {
*outNanoseconds = samples;
return true;
}
if (query->kind == VulkanTimerQuery::Kind::XfbWritten ||
query->kind == VulkanTimerQuery::Kind::XfbGenerated) {
Uint64 primitives = 0;
if (!pVulkanRenderer->ResolveXfbQueryResult(query->occlusionSlots,
query->kind == VulkanTimerQuery::Kind::XfbGenerated,
primitives)) {
return false;
}
*outNanoseconds = primitives;
return true;
}
// With wait, mirrors ClientWaitSync: a query ended this frame cannot
// complete until Present submits the commands, so the wait refuses to
// block on the current unsubmitted serial. Returning false keeps the
@@ -1700,6 +1711,27 @@ namespace MobileGL::MG_Backend::DirectVulkan {
delete static_cast<VulkanTimerQuery*>(handle);
}
BackendQueryHandle BeginXfbPrimitivesQuery(Bool generated) {
MOBILEGL_ASSERT(pVulkanRenderer, "DirectVulkan::BeginXfbPrimitivesQuery called with null VulkanRenderer");
if (!pVulkanRenderer->StartXfbQueryCapture(generated ? 1u : 0u)) {
return nullptr;
}
auto* query = new VulkanTimerQuery{};
query->kind = generated ? VulkanTimerQuery::Kind::XfbGenerated : VulkanTimerQuery::Kind::XfbWritten;
query->rendererGeneration = GetRendererGeneration();
return query;
}
void EndXfbPrimitivesQuery(BackendQueryHandle handle) {
auto* query = static_cast<VulkanTimerQuery*>(handle);
MOBILEGL_ASSERT(pVulkanRenderer, "DirectVulkan::EndXfbPrimitivesQuery called with null VulkanRenderer");
if (query == nullptr || query->rendererGeneration != GetRendererGeneration()) {
return;
}
pVulkanRenderer->StopXfbQueryCapture(
query->kind == VulkanTimerQuery::Kind::XfbGenerated ? 1u : 0u, query->occlusionSlots);
}
BackendQueryHandle BeginOcclusionQuery() {
MOBILEGL_ASSERT(pVulkanRenderer, "DirectVulkan::BeginOcclusionQuery called with null VulkanRenderer");
if (!pVulkanRenderer->StartOcclusionQueryCapture()) {