forge-stencil-testing

To enable stencil testing in an SDL GPU project, select a depth-stencil format with stencil bits like D24_UNORM_S8_UINT, configure the pipeline stencil state, and apply per-draw stencil references to drive masking effects.

The correct depth-stencil format for SDL GPU portal and outline rendering is D24_UNORM_S8_UINT, which provides the necessary stencil bits for per-pixel masking alongside safe fallbacks for pipeline state configuration.

Render portals using a multi-pass approach that masks and renders inside portals by enabling front and back stencil states, applying per-draw stencil references, and controlling stencil clearing to isolate the portal view.

Yes, SDL GPU supports configuring separate pipeline stencil states for front and back faces, allowing precise per-draw stencil reference adjustments needed for advanced real-time rendering techniques like outlines.

Stencil outline artifacts in SDL GPU usually occur from improper stencil clearing or incorrect color and depth write controls, which must be configured correctly to avoid visual errors when drawing expanded objects.

The best way to draw an outline effect using stencil testing is to draw an expanded object where the stencil matches, utilizing per-draw stencil references and disabling color or depth writes to isolate the outline geometry.