Implement better index caching in Latte

src/Cafe/HW/Latte/Core/LatteCommandProcessor.cpp

@@ -141,6 +141,14 @@ class DrawPassContext
 
 void LatteCP_processCommandBuffer(DrawPassContext& drawPassCtx);
 
+// called whenever the GPU runs out of commands or hits a wait condition (semaphores, HLE waits)
+void LatteCP_signalEnterWait()
+{
+	// based on the assumption that games won't do a rugpull and swap out buffer data in the middle of an uninterrupted sequence of drawcalls,
+	// we only flush caches when the GPU goes idle or has to wait for any operation
+	LatteIndices_invalidateAll();
+}
+
 /*
 * Read a U32 from the command buffer
 * If no data is available then wait in a busy loop
@@ -466,6 +474,8 @@ LatteCMDPtr LatteCP_itWaitRegMem(LatteCMDPtr cmd, uint32 nWords)
 	const uint32 GPU7_WAIT_MEM_OP_GREATER = 6;
 	const uint32 GPU7_WAIT_MEM_OP_NEVER = 7;
 
+	LatteCP_signalEnterWait();
+
 	bool stalls = false;
 	if ((word0 & 0x10) != 0)
 	{
@@ -594,6 +604,7 @@ LatteCMDPtr LatteCP_itMemSemaphore(LatteCMDPtr cmd, uint32 nWords)
 	else if(SEM_SIGNAL == 7)
 	{
 		// wait
+		LatteCP_signalEnterWait();
 		size_t loopCount = 0;
 		while (true)
 		{
@@ -1305,11 +1316,13 @@ void LatteCP_processCommandBuffer(DrawPassContext& drawPassCtx)
 				}
 				case IT_HLE_TRIGGER_SCANBUFFER_SWAP:
 				{
+					LatteCP_signalEnterWait();
 					LatteCP_itHLESwapScanBuffer(cmdData, nWords);
 					break;
 				}
 				case IT_HLE_WAIT_FOR_FLIP:
 				{
+					LatteCP_signalEnterWait();
 					LatteCP_itHLEWaitForFlip(cmdData, nWords);
 					break;
 				}
@@ -1594,12 +1607,14 @@ void LatteCP_ProcessRingbuffer()
 			}
 			case IT_HLE_TRIGGER_SCANBUFFER_SWAP:
 			{
+				LatteCP_signalEnterWait();
 				LatteCP_itHLESwapScanBuffer(cmd, nWords);
 				timerRecheck += CP_TIMER_RECHECK / 64;
 				break;
 			}
 			case IT_HLE_WAIT_FOR_FLIP:
 			{
+				LatteCP_signalEnterWait();
 				LatteCP_itHLEWaitForFlip(cmd, nWords);
 				timerRecheck += CP_TIMER_RECHECK / 1;
 				break;

src/Cafe/HW/Latte/Core/LatteIndices.cpp

@@ -1,6 +1,7 @@
 #include "Cafe/HW/Latte/Core/LatteConst.h"
 #include "Cafe/HW/Latte/Renderer/Renderer.h"
 #include "Cafe/HW/Latte/ISA/RegDefines.h"
+#include "Cafe/HW/Latte/Core/LattePerformanceMonitor.h"
 #include "Common/cpu_features.h"
 
 #if defined(ARCH_X86_64) && defined(__GNUC__)
@@ -9,32 +10,53 @@
 
 struct  
 {
-	const void* lastPtr;
-	uint32 lastCount;
-	LattePrimitiveMode lastPrimitiveMode;
-	LatteIndexType lastIndexType;
-	// output
-	uint32 indexMin;
-	uint32 indexMax;
-	Renderer::INDEX_TYPE renderIndexType;
-	uint32 outputCount;
-	uint32 indexBufferOffset;
-	uint32 indexBufferIndex;
+	struct CacheEntry
+	{
+		// input data
+		const void* lastPtr;
+		uint32 lastCount;
+		LattePrimitiveMode lastPrimitiveMode;
+		LatteIndexType lastIndexType;
+		uint64 lastUsed;
+		// output
+		uint32 indexMin;
+		uint32 indexMax;
+		Renderer::INDEX_TYPE renderIndexType;
+		uint32 outputCount;
+		Renderer::IndexAllocation indexAllocation;
+	};
+	std::array<CacheEntry, 8> entry;
+	uint64 currentUsageCounter{0};
 }LatteIndexCache{};
 
 void LatteIndices_invalidate(const void* memPtr, uint32 size)
 {
-	if (LatteIndexCache.lastPtr >= memPtr && (LatteIndexCache.lastPtr < ((uint8*)memPtr + size)) )
+	for(auto& entry : LatteIndexCache.entry)
 	{
-		LatteIndexCache.lastPtr = nullptr;
-		LatteIndexCache.lastCount = 0;
+		if (entry.lastPtr >= memPtr && (entry.lastPtr < ((uint8*)memPtr + size)) )
+		{
+			if(entry.lastPtr != nullptr)
+				g_renderer->indexData_releaseIndexMemory(entry.indexAllocation);
+			entry.lastPtr = nullptr;
+			entry.lastCount = 0;
+		}
 	}
 }
 
 void LatteIndices_invalidateAll()
 {
-	LatteIndexCache.lastPtr = nullptr;
-	LatteIndexCache.lastCount = 0;
+	for(auto& entry : LatteIndexCache.entry)
+	{
+		if (entry.lastPtr != nullptr)
+			g_renderer->indexData_releaseIndexMemory(entry.indexAllocation);
+		entry.lastPtr = nullptr;
+		entry.lastCount = 0;
+	}
+}
+
+uint64 LatteIndices_GetNextUsageIndex()
+{
+	return LatteIndexCache.currentUsageCounter++;
 }
 
 uint32 LatteIndices_calculateIndexOutputSize(LattePrimitiveMode primitiveMode, LatteIndexType indexType, uint32 count)
@@ -532,7 +554,7 @@ void LatteIndices_alternativeCalculateIndexMinMax(const void* indexData, LatteIn
 	}
 }
 
-void LatteIndices_decode(const void* indexData, LatteIndexType indexType, uint32 count, LattePrimitiveMode primitiveMode, uint32& indexMin, uint32& indexMax, Renderer::INDEX_TYPE& renderIndexType, uint32& outputCount, uint32& indexBufferOffset, uint32& indexBufferIndex)
+void LatteIndices_decode(const void* indexData, LatteIndexType indexType, uint32 count, LattePrimitiveMode primitiveMode, uint32& indexMin, uint32& indexMax, Renderer::INDEX_TYPE& renderIndexType, uint32& outputCount, Renderer::IndexAllocation& indexAllocation)
 {
 	// what this should do:
 	// [x] use fast SIMD-based index decoding
@@ -542,17 +564,18 @@ void LatteIndices_decode(const void* indexData, LatteIndexType indexType, uint32
 	// [ ] better cache implementation, allow to cache across frames
 
 	// reuse from cache if data didn't change
-	if (LatteIndexCache.lastPtr == indexData &&
-		LatteIndexCache.lastCount == count &&
-		LatteIndexCache.lastPrimitiveMode == primitiveMode &&
-		LatteIndexCache.lastIndexType == indexType)
-	{
-		indexMin = LatteIndexCache.indexMin;
-		indexMax = LatteIndexCache.indexMax;
-		renderIndexType = LatteIndexCache.renderIndexType;
-		outputCount = LatteIndexCache.outputCount;
-		indexBufferOffset = LatteIndexCache.indexBufferOffset;
-		indexBufferIndex = LatteIndexCache.indexBufferIndex;
+	auto cacheEntry = std::find_if(LatteIndexCache.entry.begin(), LatteIndexCache.entry.end(), [indexData, count, primitiveMode, indexType](const auto& entry)
+	{
+		return entry.lastPtr == indexData && entry.lastCount == count && entry.lastPrimitiveMode == primitiveMode && entry.lastIndexType == indexType;
+	});
+	if (cacheEntry != LatteIndexCache.entry.end())
+	{
+		indexMin = cacheEntry->indexMin;
+		indexMax = cacheEntry->indexMax;
+		renderIndexType = cacheEntry->renderIndexType;
+		outputCount = cacheEntry->outputCount;
+		indexAllocation = cacheEntry->indexAllocation;
+		cacheEntry->lastUsed = LatteIndices_GetNextUsageIndex();
 		return;
 	}
 
@@ -576,10 +599,12 @@ void LatteIndices_decode(const void* indexData, LatteIndexType indexType, uint32
 		indexMin = 0;
 		indexMax = std::max(count, 1u)-1;
 		renderIndexType = Renderer::INDEX_TYPE::NONE;
+		indexAllocation = {};
 		return; // no indices
 	}
 	// query index buffer from renderer
-	void* indexOutputPtr = g_renderer->indexData_reserveIndexMemory(indexOutputSize, indexBufferOffset, indexBufferIndex);
+	indexAllocation = g_renderer->indexData_reserveIndexMemory(indexOutputSize);
+	void* indexOutputPtr = indexAllocation.mem;
 
 	// decode indices
 	indexMin = std::numeric_limits<uint32>::max();
@@ -704,16 +729,25 @@ void LatteIndices_decode(const void* indexData, LatteIndexType indexType, uint32
 		// recalculate index range but filter out primitive restart index
 		LatteIndices_alternativeCalculateIndexMinMax(indexData, indexType, count, indexMin, indexMax);
 	}
-	g_renderer->indexData_uploadIndexMemory(indexBufferOffset, indexOutputSize);
+	g_renderer->indexData_uploadIndexMemory(indexAllocation);
+	performanceMonitor.cycle[performanceMonitor.cycleIndex].indexDataUploaded += indexOutputSize;
+	// get least recently used cache entry
+	auto lruEntry = std::min_element(LatteIndexCache.entry.begin(), LatteIndexCache.entry.end(), [](const auto& a, const auto& b)
+	{
+		return a.lastUsed < b.lastUsed;
+	});
+	// invalidate previous allocation
+	if(lruEntry->lastPtr != nullptr)
+		g_renderer->indexData_releaseIndexMemory(lruEntry->indexAllocation);
 	// update cache
-	LatteIndexCache.lastPtr = indexData;
-	LatteIndexCache.lastCount = count;
-	LatteIndexCache.lastPrimitiveMode = primitiveMode;
-	LatteIndexCache.lastIndexType = indexType;
-	LatteIndexCache.indexMin = indexMin;
-	LatteIndexCache.indexMax = indexMax;
-	LatteIndexCache.renderIndexType = renderIndexType;
-	LatteIndexCache.outputCount = outputCount;
-	LatteIndexCache.indexBufferOffset = indexBufferOffset;
-	LatteIndexCache.indexBufferIndex = indexBufferIndex;
+	lruEntry->lastPtr = indexData;
+	lruEntry->lastCount = count;
+	lruEntry->lastPrimitiveMode = primitiveMode;
+	lruEntry->lastIndexType = indexType;
+	lruEntry->indexMin = indexMin;
+	lruEntry->indexMax = indexMax;
+	lruEntry->renderIndexType = renderIndexType;
+	lruEntry->outputCount = outputCount;
+	lruEntry->indexAllocation = indexAllocation;
+	lruEntry->lastUsed = LatteIndices_GetNextUsageIndex();
 }

src/Cafe/HW/Latte/Core/LatteIndices.h

@@ -4,4 +4,4 @@
 
 void LatteIndices_invalidate(const void* memPtr, uint32 size);
 void LatteIndices_invalidateAll();
-void LatteIndices_decode(const void* indexData, LatteIndexType indexType, uint32 count, LattePrimitiveMode primitiveMode, uint32& indexMin, uint32& indexMax, Renderer::INDEX_TYPE& renderIndexType, uint32& outputCount, uint32& indexBufferOffset, uint32& indexBufferIndex);
+void LatteIndices_decode(const void* indexData, LatteIndexType indexType, uint32 count, LattePrimitiveMode primitiveMode, uint32& indexMin, uint32& indexMax, Renderer::INDEX_TYPE& renderIndexType, uint32& outputCount, Renderer::IndexAllocation& indexAllocation);

src/Cafe/HW/Latte/Core/LatteOverlay.cpp

@@ -107,7 +107,13 @@ void LatteOverlay_renderOverlay(ImVec2& position, ImVec2& pivot, sint32 directio
 				ImGui::Text("VRAM: %dMB / %dMB", g_state.vramUsage, g_state.vramTotal);
 
 			if (config.overlay.debug)
+			{
+				// general debug info
+				ImGui::Text("--- Debug info ---");
+				ImGui::Text("IndexUploadPerFrame: %dKB", (performanceMonitor.stats.indexDataUploadPerFrame+1023)/1024);
+				// backend specific info
 				g_renderer->AppendOverlayDebugInfo();
+			}
 
 			position.y += (ImGui::GetWindowSize().y + 10.0f) * direction;
 		}

src/Cafe/HW/Latte/Core/LattePerformanceMonitor.cpp

@@ -74,15 +74,14 @@ void LattePerformanceMonitor_frameEnd()
 		uniformBankDataUploadedPerFrame /= 1024ULL;
 		uint32 uniformBankCountUploadedPerFrame = (uint32)(uniformBankUploadedCount / (uint64)elapsedFrames);
 		uint64 indexDataUploadPerFrame = (indexDataUploaded / (uint64)elapsedFrames);
-		indexDataUploadPerFrame /= 1024ULL;
 
 		double fps = (double)elapsedFrames2S * 1000.0 / (double)totalElapsedTimeFPS;
 		uint32 shaderBindsPerFrame = shaderBindCounter / elapsedFrames;
 		passedCycles = passedCycles * 1000ULL / totalElapsedTime;
 		uint32 rlps = (uint32)((uint64)recompilerLeaveCount * 1000ULL / (uint64)totalElapsedTime);
 		uint32 tlps = (uint32)((uint64)threadLeaveCount * 1000ULL / (uint64)totalElapsedTime);
 		// set stats
-
+		performanceMonitor.stats.indexDataUploadPerFrame = indexDataUploadPerFrame;
 		// next counter cycle
 		sint32 nextCycleIndex = (performanceMonitor.cycleIndex + 1) % PERFORMANCE_MONITOR_TRACK_CYCLES;
 		performanceMonitor.cycle[nextCycleIndex].drawCallCounter = 0;

src/Cafe/HW/Latte/Core/LattePerformanceMonitor.h

@@ -131,6 +131,12 @@ typedef struct
 		LattePerfStatCounter numDrawBarriersPerFrame;
 		LattePerfStatCounter numBeginRenderpassPerFrame;
 	}vk;
+
+	// calculated stats (per frame)
+	struct
+	{
+		uint32 indexDataUploadPerFrame;
+	}stats;
 }performanceMonitor_t;
 
 extern performanceMonitor_t performanceMonitor;

src/Cafe/HW/Latte/Core/LatteRenderTarget.cpp

@@ -11,7 +11,6 @@
 #include "Cafe/HW/Latte/Core/LattePerformanceMonitor.h"
 #include "Cafe/GraphicPack/GraphicPack2.h"
 #include "config/ActiveSettings.h"
-#include "Cafe/HW/Latte/Renderer/Vulkan/VulkanRenderer.h"
 #include "gui/guiWrapper.h"
 #include "Cafe/OS/libs/erreula/erreula.h"
 #include "input/InputManager.h"

src/Cafe/HW/Latte/Renderer/OpenGL/OpenGLRenderer.h

@@ -102,16 +102,21 @@ class OpenGLRenderer : public Renderer
 	static void SetAttributeArrayState(uint32 index, bool isEnabled, sint32 aluDivisor);
 	static void SetArrayElementBuffer(GLuint arrayElementBuffer);
 
-	// index
-	void* indexData_reserveIndexMemory(uint32 size, uint32& offset, uint32& bufferIndex) override
+	// index (not used by OpenGL renderer yet)
+	IndexAllocation indexData_reserveIndexMemory(uint32 size) override
 	{
-		assert_dbg();
-		return nullptr;
+		cemu_assert_unimplemented();
+		return {};
 	}
 
-	void indexData_uploadIndexMemory(uint32 offset, uint32 size) override
+	void indexData_releaseIndexMemory(IndexAllocation& allocation) override
 	{
-		assert_dbg();
+		cemu_assert_unimplemented();
+	}
+
+	void indexData_uploadIndexMemory(IndexAllocation& allocation) override
+	{
+		cemu_assert_unimplemented();
 	}
 
 	// uniform

src/Cafe/HW/Latte/Renderer/Renderer.h

@@ -138,8 +138,15 @@ class Renderer
 	virtual void draw_endSequence() = 0;
 
 	// index
-	virtual void* indexData_reserveIndexMemory(uint32 size, uint32& offset, uint32& bufferIndex) = 0;
-	virtual void indexData_uploadIndexMemory(uint32 offset, uint32 size) = 0;
+	struct IndexAllocation
+	{
+		void* mem; // pointer to index data inside buffer
+		void* rendererInternal; // for renderer use
+	};
+
+	virtual IndexAllocation indexData_reserveIndexMemory(uint32 size) = 0;
+	virtual void indexData_releaseIndexMemory(IndexAllocation& allocation) = 0;
+	virtual void indexData_uploadIndexMemory(IndexAllocation& allocation) = 0;
 
 	// occlusion queries
 	virtual LatteQueryObject* occlusionQuery_create() = 0;