284027 2024-12-04 00:29:28 -0800 [TextureMapper] Polygon clipping performance is extremely slow 2024-12-08 13:07:26 -0800 1 1 1 Unclassified WebKit WPE WebKit WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=282682 P2 Normal --- 283820 1 jani jani bugs-noreply fujii oldest_to_newest 2079057 0 jani 2024-12-04 00:29:28 -0800 Rendering complex preserve-3D scenes might involve a lot of layer splitting. Layer split rendering is achieved with polygon clipping. These splits are handled using polygon clipping, but the current implementation is inefficient. Each clip operation clears the full stencil buffer and masks the clipped part using separate vertex buffer objects that are allocated on demand. This places significant stress on the GPU and on hardware like rpi3 it completely chokes the rendering pipeline. To address this issue, polygon clip vertices for preserve-3d scenes should be loaded to the GPU only once, leveraging cached VBOs. Additionally, stencil buffer clearing should be optimized using scissors to restrict stencil clears to relevant areas, avoiding full-buffer operations. 2079908 1 jani 2024-12-07 08:36:29 -0800 Pull request: https://github.com/WebKit/WebKit/pull/37596 2080011 2 ews-feeder 2024-12-08 13:07:23 -0800 Committed 287519@main (3440db247780): <https://commits.webkit.org/287519@main> Reviewed commits have been landed. Closing PR #37596 and removing active labels.