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16 lines
5.0 KiB
Markdown
16 lines
5.0 KiB
Markdown
# libSceGnmDriverForNeoMode technical debt
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### Unknown function info
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- [libSceGnmDriverForNeoMode pending exports](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) - 34 named callable exports are listed in the [PS5 3.20 export table](https://github.com/DNNDHH/PS5-3.20_Libs/blob/b2a77c09cd71c01f34c790cfbe98c751a13262ad/libSceGnmDriverForNeoMode.c) and were cross-checked against the same module in PS5 firmware 13.60. Their signatures and behaviour are unverified; the declarations use the no-parameter unknown-signature convention and throw through `NotImplemented_nid_no_patch`.
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### Functional
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- [retail-only answers](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - the debug resets, the resource and owner registration calls, the SDMA calls and the SQ counter calls return `0x8EEE00FF`, the five `sceGnmDriverInternalRetrieveGnmInterface*` calls return `0x80000000`, `sceGnmGetDbgGcHandle` returns -1, `sceGnmDriverTraceInProgress` and `sceGnmValidateOnSubmitEnabled` return 0 and the other validation calls return `0x80D13FFF`. These are the values [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver.cpp) returns for calls it marks as not available in retail firmware; they are not measured on a console, and the arguments are not read
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- [default state packets](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - `sceGnmDrawInitDefaultHardwareState`, `sceGnmDrawInitDefaultHardwareState200`, `sceGnmDrawInitDefaultHardwareState350`, `sceGnmDrawInitToDefaultContextState` and `sceGnmDrawInitToDefaultContextState400` write the sequences in [InitSequences.hpp](../../../core/libs/prx/libSceGnmDriverForNeoMode/include/InitSequences.hpp), taken from [shadPS4's gnmdriver_init.h](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver_init.h): its Neo sequences, except the plain hardware state, which shadPS4 also writes unchanged in Neo mode. The size checks and returned sizes are shadPS4's. Not compared with console output, and nothing in AnyPS5 consumes a GNM command buffer yet
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- [draw, dispatch, wait and VGT packets](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - the signatures, size checks, PM4 words and refusals (-1) of the 17 command writers follow [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver.cpp) on its Neo-mode path, since this module is the Neo-mode driver: draw initiators keep flag bits 29 to 31, and `sceGnmSetVgtControl` and `sceGnmResetVgtControl` write `IA_MULTI_VGT_PARAM` through `SET_UCONFIG_REG` (shadPS4's `UseNeoCompatSequences` is false). The packets are not compared with console output, and nothing in AnyPS5 consumes a GNM command buffer yet
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- [embedded shaders](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - `sceGnmSetEmbeddedVsShader` (id 0, a fullscreen triangle) and `sceGnmSetEmbeddedPsShader` (id 0 writes black, id 1 exports depth only) write the register packets of [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver.cpp), pointing at the shader code in [EmbeddedShaders.hpp](../../../core/libs/prx/libSceGnmDriverForNeoMode/include/EmbeddedShaders.hpp) in this module's memory instead of the console's `0xfe000f00` area. That code is shadPS4's instruction listing assembled with LLVM 19 `llvm-mc -arch=amdgcn -mcpu=bonaire`, without the binary header and register block that follow it on the console, since nothing here reads them; another id returns `0x8EEE00FF`. The size and modifier arguments are not checked, as in shadPS4. Not compared with console output, and nothing in AnyPS5 consumes a GNM command buffer yet
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- [shader register packets](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - `sceGnmUpdateVsShader`, `sceGnmUpdatePsShader`, `sceGnmUpdatePsShader350`, `sceGnmSetPsShader350`, `sceGnmUpdateGsShader`, `sceGnmUpdateHsShader` and `sceGnmSetCsShaderWithModifier` write the packets, size checks and -1 refusals of [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver.cpp); the update forms carry context registers inside NOP packets as there. Not compared with console output, and nothing in AnyPS5 consumes a GNM command buffer yet
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- [workloads](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - `sceGnmCreateWorkloadStream`, `sceGnmBeginWorkload` and `sceGnmEndWorkload` return shadPS4's values (3 for a null output or name, 1 for a stream above 15, 2 for workload 0 or one with a top byte above 15) and keep no state; not measured on a console
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- [sceGnmGetGpuCoreClockFrequency](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - returns 911 MHz, shadPS4's Neo-mode value, which it derives from Neo mode instead of the console's ioctl. `sceGnmGetOffChipTessellationBufferSize` returns shadPS4's `0x800000`
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