From a112b41d51ef8b114bbbbebb59eab1972750a23c Mon Sep 17 00:00:00 2001 From: Adam Malczewski Date: Fri, 12 Jun 2026 20:34:03 +0900 Subject: Slice 3: THE SPIKE — RMLUi→wlr_scene bridge lands, GO MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Plan A verified on hardware (HD 4400/crocus): RMLUi renders into a GLES 3.2 sibling-context FBO backed by a dmabuf wlr_buffer (wlr_allocator + EGLImage import), composited as a wlr_scene_buffer with per-frame damage. Plan B (glReadPixels→shm) implemented and verified as runtime fallback; auto-engages when any Plan-A precondition fails. Plan C not needed. - Hello-world RML doc: text, data-bound frame counter, pointer input proof (hover/:active) — verified upright on screen via screenshot after fixing the classic FBO Y-flip (buffer-level V-flip keeps display == document coords for input); position-aware orientation guard added. - Temporary spike surface: Options::ui_spike + frame-count/orientation probes, host-bin --ui-spike flag; replaced by the real ui substrate contract in slice 4+. - kernel suite 6 cases / 416 assertions green; ASan/UBSan clean in our code (Mesa leak noise + 2 benign UBSan downcast reports inside vendored RMLUi are known); idle RSS ≈83 MiB. - Deferred (notes/plan.md §7): glFinish→EGL fence + swapchain; dmabuf render-format negotiation (private API in wlroots 0.20). --- packages/kernel/src/server_impl.hpp | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'packages/kernel/src/server_impl.hpp') diff --git a/packages/kernel/src/server_impl.hpp b/packages/kernel/src/server_impl.hpp index 3abf739..2975537 100644 --- a/packages/kernel/src/server_impl.hpp +++ b/packages/kernel/src/server_impl.hpp @@ -4,6 +4,7 @@ #include #include "listener.hpp" +#include "ui_spike.hpp" #include #include @@ -80,6 +81,12 @@ struct Server::Impl { wlr_seat* seat = nullptr; std::string socket; + // Slice-3 spike: RMLUi -> wlr_scene bridge. Null unless options.ui_spike + // and the bridge started; a started-but-disabled bridge is non-null but + // reports Plan::Disabled. Owned here; torn down in shutdown() BEFORE the + // scene/renderer/allocator die. + std::unique_ptr ui_spike; + // Ownership (RAII teardown); drained naturally during shutdown by the // destroy events wl_display_destroy_clients / backend destroy fire. std::list> outputs; @@ -135,6 +142,7 @@ struct Server::Impl { void init(); // throws std::runtime_error on any component failure void shutdown(); void handle_new_output(wlr_output* output); + void start_ui_spike(); // slice-3 spike; never throws, may no-op // toplevel.cpp void handle_new_toplevel(wlr_xdg_toplevel* toplevel); -- cgit v1.2.3