Modern OpenGL Core

Source: examples/demo-libretro

The demo example is a hardware-rendered core with input and audio feedback. It shows:

• content/no-game handling,
• modern preferred OpenGL context negotiation,
• typed GL loading with Gl::init,
• shader/program/buffer/vertex-array setup,
• typed joypad polling,
• generated audio mixed into a silent frame batch,
• hardware frame submission with video_refresh_hw_with_audio,
• fallback duplicate-frame submission when hardware state is unavailable.

The triangle changes color based on whether content was supplied and moves with joypad input. This makes it a useful smoke test for content loading, input, OpenGL, and audio pacing in one core.

Lifecycle map:

• load_game logs optional content, sets PixelFormat::Xrgb8888, and requests opengl_modern_preferred_hw_render_candidates().
• run polls joypad input, mixes a short sound effect into a silent audio batch, renders into runtime.current_framebuffer(), and submits video_refresh_hw_with_audio.
• hw_context_reset loads Gl, picks shader sources for the negotiated GL family, and creates the program, buffer, and optional vertex array.
• hw_context_destroy deletes GL-owned objects and clears cached handles.

Fallbacks in this demo keep audio moving with duplicate frames. For visible OpenGL diagnostics, use the compatibility example.

Tutorials:

• Input
• Audio
• OpenGL