dosbox core misbehaving with the gl driver.

The DOSBox core performs very badly when it is run under a RetroArch instance that uses the gl driver with VSync on. There is no impact on the frame rate (58-60fps), but audio loops sometimes and it takes at least twice as much time to load and run games in comparison to the sdl and xvideo driver.

Both dosbox_libretro.so and retroarch were compiled from git today (Dec 29 in UTC-3).

Video settings:

video_shader_enable = "true"
video_aspect_ratio = "-1.000000"
video_xscale = "1.000000"
video_yscale = "1.000000"
video_crop_overscan = "true"
video_scale_integer = "false"
video_smooth = "false"
video_threaded = "false"
video_fullscreen = "false"
video_refresh_rate = "59.950001"
video_driver = "gl"
video_vsync = "true"
video_hard_sync = "false"
video_hard_sync_frames = "0"
video_black_frame_insertion = "false"
video_swap_interval = "1"
video_gpu_screenshot = "true"
video_rotation = "0"
video_shader_dir = "default"
video_font_size = "48.000000"
video_shader = ""

Games tested:

• Beats of Rage (screen freezes sometimes)
• DOOM (1993)
• MicroMachines (1994)

System configuration:

• Intel Core 2 Duo E7400 2.8 GHz
• 3GB of memory
• EVGA Nvidia GeForce 8400gs (proprietary driver version 331.20)
• Archlinux 64bit

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No source file or test is named. Reproduce the DOSBox core with RetroArch's gl driver and VSync enabled, comparing it with sdl and xvideo using the listed games and settings; done means the audio looping, freezes, and excessive load or run time are no longer observed.