turnip: Update on Open Source Vulkan Driver for Adreno GPUs
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The update details advancements in the open-source Vulkan driver for Adreno GPUs, including support for new A7XX devices and major extensions like vk_ext_descriptor_buffer. Key improvements focus on correctness, better debugging tools for GPU issues, and enhancing rendering capabilities, with future plans for functionality such as ray tracing. The document also highlights the capabilities of the Turnip driver and its use in emulating desktop games on Android devices.
turnip: Update on Open Source Vulkan Driver for Adreno GPUs
- 1. Update on Open Source Vulkan Driver for Adreno GPUs Danylo Piliaiev 2024-02-04 1
- 2. New Hardware Support A7XX GPUs are now supported A730/A740 merged last year A750 has MR on review Direct (non-tile-based) rendering passes CTS tests Tile-based rendering is still WIP Most A6XX GPU variants are supported A6XX is divided in 5 sub-generations 2
- 3. Notable Changes Major Extensions: VK_EXT_descriptor_buffer VK_EXT_extended_dynamic_state3 VK_EXT_graphics_pipeline_library VK_EXT_fragment_density_map VK_EXT_inline_uniform_block VK_KHR_dynamic_rendering Vulkan 1.3 is supported for a while now 3
- 4. Notable Changes A lot of recent focus was on correctness: Fixing vkcts tests Fixing issues in various games Lots of pipelines code improvements from Connor IR3 optimizations Better debug tooling 4
- 5. Better Debug Tooling Especially important for reverse-engineering Gave in-depth talk at 2023 XDC "Debugging GPU faults: QoL tools for your driver" Tooling: GPU breadcrumbs GPU command stream replaying GPU command stream editing Printing from shader assembly Stale reg debugging https://www.youtube.com/watch?v=FI0nfK4O8r Q 5
- 6. GPU breadcrumbs API level breadcrumbs like Graphics Flight Recorder are cool They may be too coarse They generally don't work with unrecoverable hangs 6
- 7. GPU command stream replaying Reproducing hangs and other failures may be hard Recording submitted commands is simple and effective Not all issues are reproducible this way Requires recording ALL used buffers > ~/bin/replay /tmp/tu_vkcube.vkcube_device0_combine Reading /tmp/tu_vkcube.vkcube_device0_combined.rd.. chip_id: 0x7090000 cmdstream 0: 169 dwords cmdstream 1: 238 dwords 7
- 8. GPU command stream editing Reproducing issue is not enough How to find out the cause? What if we could edit any submitted GPU packet? Good news! It's easy to implement and already used in Turnip! /* pkt4: GRAS_2D_RESOLVE_CNTL_2 = { X = 63 | Y = 63 } */ pkt(cs, 4128831); /* pkt4: RB_BLIT_SCISSOR_TL = { X = 0 | Y = 0 } */ pkt4(cs, 0x88d1, (2), 0); /* pkt4: RB_BLIT_SCISSOR_BR = { X = 63 | Y = 63 } */ pkt(cs, 4128831); pkt7(cs, CP_MEM_WRITE, 20); /* { ADDR_LO = 0x1f7580 } */ pkt(cs, 2061696); 8
- 9. Printing from shader assembly There is a fault in shader, a hang, misrenderings? Even the most basic print is useful! sel.b32 r0.y, c1.x, r0.x, c0.x sel.b32 r0.z, c1.y, r0.x, c0.y sel.b32 r1.y, c1.z, r0.x, c0.z sel.b32 r1.z, c1.w, r0.x, c0.w print r2.x, r0.y, r0.z, r1.y, r1.z Uses r2.xyz as tmp storage, prints the rest 9
- 10. Stale reg debugging Using value from stale reg is not a rare occurance Could result in geometry flickering, hangs, random cts failures What if we write invalid values to regs: All regs at the start of each command buffer To regs used in renderpasses before each reanderpass/blit 10
- 11. Turnip and emulators on Android Proprietary drivers on Android are rarely updated Many users are stuck with old drivers and issues For emulators supporting all quirks of old drivers is hard It's easier to use Turnip in many cases 11
- 12. Turnip vs Proprietary Driver on Zelda Sony Xperia 5 II (Adreno 650) + Turnip Credits to @crumpetdialogue discord user on Yuzu channel 12
- 13. Turnip vs Proprietary Driver on Zelda Same device, same user, proprietary driver 13
- 14. Turnip runs desktop games Turnip implements all extension for DXVK and VKD3D-Proton Adreno GPUs are rather capable ones! FEX emulator allows to run x86-64 apps on aarch64 We test game traces and games themselves 14
- 15. Future Support tiling (GMEM) rendering on A7XX Mark Collins is working on it Squeeze more performance! Distant future: Support raytracing Maybe mesh shaders are doable 15
- 16. Future Easy way to run desktop games on Android! (NOT Igalia's project) There is work-in-progress project called Cassia It's a Wine+DXVK+VKD3D-Proton+FEXCore on Android Turnip would have first party support there 16
- 17. But I already saw desktop games there Yes, people already running them! On Android, with Turnip Via Mobox project: termux + box64 + wine + dxvk + mesa Credits to Mad CatZ youtube channel: 17
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