3.2.2 OpenGL

Procedure: make-gl-context window

Create an OpenGL context for window.

Procedure: delete-gl-context! context

Delete context, an OpenGL context object.

Procedure: call-with-gl-context window proc

Call proc with a new OpenGL context created for window, and close the context when proc returns or otherwise exits.

Procedure: swap-gl-window window

Update window with OpenGL rendering.

Procedure: set-gl-attribute! attr value

Set the OpenGL attribute represented by the symbol attr to value. Possible values for attr are:

• red-size
• green-size
• blue-size
• alpha-size
• buffer-size
• double-buffer
• depth-size
• stencil-size
• accum-red-size
• accum-green-size
• accum-blue-size
• stereo
• multisample-buffers
• multisample-samples
• retained-backing
• context-major-version
• context-minor-version
• context-egl
• context-flags
• context-profile-mask
• share-with-current-context
• framebuffer-srgb-capable

Procedure: set-gl-swap-interval! interval

Set the framebuffer swap interval for the current OpenGL context to the type indicated by the symbol interval. Possible values of interval are:

• immediate, for immediate updates
• vsync, for updates synchronized with the screen’s vertical retrace
• late-swap-tear, for late swap tearing

Late swap tearing works the same as vsync, but if the vertical retrace has been missed for a given frame, buffers are swapped immediately, which might be less jarring for the user during occasional framerate drops.