https://bugs.freedesktop.org/show_bug.cgi?id=105256
Bug ID: 105256 Summary: Slow performance using glDrawElementsBaseVertex Product: Mesa Version: 17.3 Hardware: Other OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/r600 Assignee: dri-devel@lists.freedesktop.org Reporter: logan@bacoosta.com QA Contact: dri-devel@lists.freedesktop.org
Original application bug report here:
https://github.com/gonetz/GLideN64/issues/1561
This bug happens using mupen64plus (N64 emulator) and the GLideN64 graphics plugin.
The application uses VBO streaming (https://www.khronos.org/opengl/wiki/Buffer_Object_Streaming) using ARB_buffer_storage to upload the VBO data.
Multiple users that when using Mesa + r600 driver, the performance was abysmal. It turns out that converting the glDrawElementsBaseVertex calls to glDrawArrays fixed the problem.
You can see the commit that fixed the problem here:
https://github.com/loganmc10/GLideN64/commit/9bcfa67d9550c7f1cd4ba72f657facd...