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softgpu-texcache-sim
ppsspp/GPU/CMakeLists.txt
T
Henrik RydgårdandClaude Opus 5.5 2b530dfa3b SoftGPU: Simulate the GE's texture cache 
Measured on hardware (ppsspp-re geprobe exp177-202, docs/ge-texture-cache.md): 64 lines of 16 bytes x 8
rows in 16 sets of 4 ways, LRU, the set index split between column and band bits by texel size. A line is
tagged by its position in the texture and its mip level only, so another texture read without TEXFLUSH
gets the first one's bytes where their lines coincide; lines load raw bytes on first read and nothing but
TEXFLUSH drops them, not rendering into the texture, block transfers or CPU writes.

TexCache steps every textured primitive through that, in submission order, from its texel footprint. A
line remembers where it came from and its bytes are copied only before that memory changes (drawing, block
transfers, copies, and anything at all when the CPU is about to run). While every line is from the one
texture read since TEXFLUSH and nothing has been copied, nothing read can differ from memory, so primitives
only log what they read, and TEXFLUSH usually drops the log unread. A primitive that reads bytes differing
from memory, or draws over what it reads, is drawn alone from its texture with what it read from the cache
laid over memory. That replaces SelfTextureSnapshot and its "fits in 8 KB" rule.

All the cache experiments match the PSP exactly except exp177, which samples a block transfer's
destination without TEXSYNC. Within a primitive this still loads every line before it draws; the GE loads
them as it rasterizes (serpentine rows, writes reaching memory a 16-byte block late), which Split
Second's blur (the one dump that changes) depends on. About 2% slower in Tekken 6 and God of War.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-09 12:27:45 +02:00

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set(GPUArch)
list(APPEND GPUArch
Common/VertexDecoderArm.cpp
Common/VertexDecoderArm64.cpp
Common/VertexDecoderX86.cpp
Software/DrawPixelX86.cpp
Software/SamplerX86.cpp
Common/VertexDecoderRiscV.cpp
Common/VertexDecoderLoongArch64.cpp
)
set(GPU_GLES
GLES/StencilBufferGLES.cpp
GLES/GPU_GLES.cpp
GLES/GPU_GLES.h
GLES/FragmentTestCacheGLES.cpp
GLES/FragmentTestCacheGLES.h
GLES/FramebufferManagerGLES.cpp
GLES/FramebufferManagerGLES.h
GLES/ShaderManagerGLES.cpp
GLES/ShaderManagerGLES.h
GLES/StateMappingGLES.cpp
GLES/StateMappingGLES.h
GLES/TextureCacheGLES.cpp
GLES/TextureCacheGLES.h
GLES/DrawEngineGLES.cpp
GLES/DrawEngineGLES.h
)
set(GPU_VULKAN
Vulkan/DebugVisVulkan.cpp
Vulkan/DebugVisVulkan.h
Vulkan/DrawEngineVulkan.cpp
Vulkan/DrawEngineVulkan.h
Vulkan/FramebufferManagerVulkan.cpp
Vulkan/FramebufferManagerVulkan.h
Vulkan/GPU_Vulkan.cpp
Vulkan/GPU_Vulkan.h
Vulkan/PipelineManagerVulkan.cpp
Vulkan/PipelineManagerVulkan.h
Vulkan/ShaderManagerVulkan.cpp
Vulkan/ShaderManagerVulkan.h
Vulkan/StateMappingVulkan.cpp
Vulkan/StateMappingVulkan.h
Vulkan/TextureCacheVulkan.cpp
Vulkan/TextureCacheVulkan.h
Vulkan/VulkanUtil.cpp
Vulkan/VulkanUtil.h
)
set(GPU_D3D11
D3D11/DrawEngineD3D11.cpp
D3D11/DrawEngineD3D11.h
D3D11/FramebufferManagerD3D11.cpp
D3D11/FramebufferManagerD3D11.h
D3D11/GPU_D3D11.cpp
D3D11/GPU_D3D11.h
D3D11/D3D11Util.cpp
D3D11/D3D11Util.h
D3D11/ShaderManagerD3D11.cpp
D3D11/ShaderManagerD3D11.h
D3D11/StateMappingD3D11.cpp
D3D11/StateMappingD3D11.h
D3D11/TextureCacheD3D11.cpp
D3D11/TextureCacheD3D11.h
)
# We build Vulkan even on Apple to avoid annoying build differences.
set(GPU_IMPLS ${GPU_GLES} ${GPU_VULKAN})
if(WIN32)
list(APPEND GPU_IMPLS ${GPU_D3D11})
endif()
set(GPU_SOURCES
${GPUArch}
${GPU_IMPLS}
${GPU_NEON}
Common/Draw2D.cpp
Common/Draw2D.h
Common/DepthBufferCommon.cpp
Common/DepthRaster.cpp
Common/DepthRaster.h
Common/DepthSwizzle.h
Common/TextureShaderCommon.cpp
Common/TextureShaderCommon.h
Common/DepalettizeShaderCommon.cpp
Common/DepalettizeShaderCommon.h
Common/FragmentShaderGenerator.cpp
Common/FragmentShaderGenerator.h
Common/VertexShaderGenerator.cpp
Common/VertexShaderGenerator.h
Common/FramebufferManagerCommon.cpp
Common/FramebufferManagerCommon.h
Common/GPUDebugInterface.cpp
Common/GPUDebugInterface.h
Common/GPUStateUtils.cpp
Common/GPUStateUtils.h
Common/DrawEngineCommon.cpp
Common/DrawEngineCommon.h
Common/PresentationCommon.cpp
Common/PresentationCommon.h
Common/ReinterpretFramebuffer.cpp
Common/ReinterpretFramebuffer.h
Common/ShaderId.cpp
Common/ShaderId.h
Common/ShaderUniforms.cpp
Common/ShaderUniforms.h
Common/ShaderCommon.cpp
Common/ShaderCommon.h
Common/SplineCommon.cpp
Common/SplineCommon.h
Common/StencilCommon.cpp
Common/StencilCommon.h
Common/SoftwareTransformCommon.cpp
Common/SoftwareTransformCommon.h
Common/VertexDecoderCommon.cpp
Common/VertexDecoderCommon.h
Common/VertexDecoderHandwritten.cpp
Common/VertexDecoderHandwritten.h
Common/VertexReader.h
Common/TransformCommon.cpp
Common/TransformCommon.h
Common/IndexGenerator.cpp
Common/IndexGenerator.h
Common/ImageCommon.h
Common/TextureDecoder.cpp
Common/TextureDecoder.h
Common/TextureCacheCommon.cpp
Common/TextureCacheCommon.h
Common/TextureScalerCommon.cpp
Common/TextureScalerCommon.h
Common/PostShader.cpp
Common/PostShader.h
Common/TextureReplacer.cpp
Common/TextureReplacer.h
Common/ReplacedTexture.cpp
Common/ReplacedTexture.h
Debugger/Breakpoints.cpp
Debugger/Breakpoints.h
Debugger/Debugger.cpp
Debugger/Debugger.h
Debugger/GECommandTable.cpp
Debugger/GECommandTable.h
Debugger/Playback.cpp
Debugger/Playback.h
Debugger/Record.cpp
Debugger/Record.h
Debugger/RecordFormat.h
Debugger/State.cpp
Debugger/State.h
Debugger/Stepping.cpp
Debugger/Stepping.h
ge_constants.h
GeConstants.cpp
GPUDefinitions.h
GeDisasm.cpp
GeDisasm.h
GPU.cpp
GPU.h
GPUCommon.cpp
GPUCommon.h
GPUCommonHW.cpp
GPUCommonHW.h
GPUState.cpp
GPUState.h
GPUStateSIMDUtil.h
Math3D.cpp
Math3D.h
Software/BinManager.cpp
Software/TexCache.cpp
Software/BinManager.h
Software/TexCache.h
Software/Clipper.cpp
Software/Clipper.h
Software/DrawPixel.cpp
Software/DrawPixel.h
Software/FuncId.cpp
Software/FuncId.h
Software/GEMath.cpp
Software/GEMath.h
Software/Lighting.cpp
Software/Lighting.h
Software/Rasterizer.cpp
Software/Rasterizer.h
Software/RasterizerRectangle.cpp
Software/RasterizerRectangle.h
Software/RasterizerRegCache.cpp
Software/RasterizerRegCache.h
Software/Sampler.cpp
Software/Sampler.h
Software/SoftGpu.cpp
Software/SoftGpu.h
Software/TransformUnit.cpp
Software/TransformUnit.h
)
# GPU has a genuine two-way dependency with Core (Core/System.cpp calls GPU_Init(), while
# all of GPU/ calls back into Core for Memory/Config/CoreTiming/etc). An OBJECT library's
# object files are always included wherever it's consumed rather than being lazily pulled
# from an archive, which sidesteps the GNU ld single-pass archive-ordering problem a normal
# two-way STATIC dependency would hit. Core links this PUBLICLY so consumers of Core get it.
add_library(GPU OBJECT ${GPU_SOURCES})
target_compile_features(GPU PUBLIC cxx_std_17)
if(LIBRETRO)
target_include_directories(GPU PRIVATE ${CMAKE_SOURCE_DIR}/libretro/libretro-common/include)
endif()
setup_target_project(GPU GPU)
# The only direct external dependencies of GPU/ itself (as opposed to Common/GPU/*, which
# already carries its own GL/Vulkan loader abstractions): raw gl*() calls in GPU/GLES, direct
# ZSTD_compress/decompress calls in GPU/Debugger/Record.cpp and Playback.cpp, and Playback.cpp
# also calls snappy_uncompress() directly.
target_link_libraries(GPU PUBLIC ${OPENGL_LIBRARIES} ${X11_LIBRARIES} Ext::Snappy)
if(USE_SYSTEM_ZSTD)
target_include_directories(GPU PRIVATE ${ZSTD_INCLUDE_DIR})
target_link_libraries(GPU PUBLIC ${ZSTD_LIBRARY})
else()
target_link_libraries(GPU PUBLIC libzstd_static)
endif()
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