Software Core

Source: examples/software-libretro

The software example is the smallest complete core in the workspace. It shows:

• SystemInfo and ContentContract setup,
• fixed geometry and timing through fixed_system_av_info,
• no-game support,
• one software framebuffer format,
• one audio batch per video frame,
• runtime.poll_input() before frame submission.

The frame is a constant blue 0RGB1555 buffer. The audio path uses silent_stereo_frames_for_video_frame(48_000, 60) so the number of frames per video frame is derived from the same timing contract reported to the frontend.

Use this example when validating lifecycle behavior before adding OpenGL, options, or advanced frontend services.

Copy this pattern for the first reusable software core:

• keep the framebuffer and audio batch in core state,
• use one content_contract() helper for system_info and on_set_environment,
• call runtime.poll_input() at the start of run,
• submit with video_refresh_frame_with_audio.

Tutorials:

• Hello World Core
• Frame Loop Basics
• Audio