Game or games this happens in

All

What area of the game / PPSSPP

When I run a game at 30fps, the core still reports 60fps. This is hardcoded in the libretro interface here:

The actual framerate of the core appears to be managed by how much audio data is pushed through the audio callback. The audio callback will block until there's room in the audio buffer for the pushed data, thus making the core.step take one frame to execute. When the audio being pushed by a single core.step is enough for 1/30th of a second, only 30 calls to core.step can occur per second. Since this is less than the 60fps that the core claims it should be generating, the frontend may start dropping renders to try to achieve the 60fps target rate. This causes the actual framerate to be even less than the 30fps being generated.

What should happen

I believe the framerate reported by the retro_system_av_info structure should reflect the actual number of frames being generated, and the RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO environment callback should be called if/when the fps changes.

The workaround is to set the ppsspp_frame_duplication setting to "enabled", thus causing the core to actually generate 60fps. But the default value for that is "disabled", and most users won't know to change it.

Logs

No response

Platform

Windows

Mobile phone model or graphics card

Radeon RX 480

PPSSPP version affected

libretro core 005f145

Last working version

n/a

Graphics backend (3D API)

OpenGL / GLES

Checklist

• Test in the latest git build in case it's already fixed.
• Search for other reports of the same issue.
• Try resetting settings or older versions and include if the issue is related.
• Try without any cheats and without loading any save states.
• Include logs or screenshots of issue.