feat(gpu): route legacy hardware to OpenGL, add hardware info to About, and expose Graphics options tab

src/app/mod.rs

@@ -619,6 +619,10 @@ pub(super) struct OpenCADStudio {
     dyn_mode: i16,
     /// Currently visible page in the application Options dialog.
     options_tab: crate::ui::window::options::OptionsTab,
+    /// Saved graphics options (backend, compat renderer); read at launch, so
+    /// edits here only take effect after a restart.
+    #[cfg(not(target_arch = "wasm32"))]
+    graphics_prefs: crate::gpu_backend::GraphicsPrefs,
     /// The Options window's commit point (see `options_session`).
     options_saved: Option<options_session::OptionsSnapshot>,
     /// Close was pressed with unapplied changes; the discard guard is up.
@@ -2262,6 +2266,15 @@ pub enum Message {
     OptionsOpen,
     /// Switch the visible page in Options.
     OptionsTabChanged(crate::ui::window::options::OptionsTab),
+    /// Options > Graphics: pin a backend (applies at next launch).
+    #[cfg(not(target_arch = "wasm32"))]
+    GraphicsBackendChanged(crate::gpu_backend::BackendChoice),
+    /// Options > Graphics: force the packed compatibility renderer.
+    #[cfg(not(target_arch = "wasm32"))]
+    GraphicsCompatToggled(bool),
+    /// Options > Graphics: prefer OpenGL on older GPUs.
+    #[cfg(not(target_arch = "wasm32"))]
+    GraphicsLegacyGlToggled(bool),
     /// Set CURSORSIZE from the Display-page slider.
     CursorSizeChanged(i32),
     /// Set PICKBOX from the Selection-page slider.
@@ -4153,6 +4166,8 @@ impl OpenCADStudio {
             dyn_input: true,
             dyn_mode: 3,
             options_tab: crate::ui::window::options::OptionsTab::General,
+            #[cfg(not(target_arch = "wasm32"))]
+            graphics_prefs: crate::gpu_backend::load_prefs(),
             options_saved: None,
             options_close_confirm: false,
             spacemouse: {

src/app/settings.rs

@@ -347,6 +347,7 @@ where
         "modeling" => OptionsTab::Modeling,
         "selection" => OptionsTab::Selection,
         "user-preferences" => OptionsTab::UserPreferences,
+        "graphics" => OptionsTab::Graphics,
         _ => OptionsTab::General,
     })
 }

src/app/update/mod.rs

@@ -7932,6 +7932,27 @@ impl OpenCADStudio {
                 Task::none()
             }
 
+            #[cfg(not(target_arch = "wasm32"))]
+            Message::GraphicsBackendChanged(choice) => {
+                self.graphics_prefs.backend = choice;
+                crate::gpu_backend::save_prefs(self.graphics_prefs);
+                Task::none()
+            }
+
+            #[cfg(not(target_arch = "wasm32"))]
+            Message::GraphicsCompatToggled(on) => {
+                self.graphics_prefs.compat_renderer = on;
+                crate::gpu_backend::save_prefs(self.graphics_prefs);
+                Task::none()
+            }
+
+            #[cfg(not(target_arch = "wasm32"))]
+            Message::GraphicsLegacyGlToggled(on) => {
+                self.graphics_prefs.legacy_gl = on;
+                crate::gpu_backend::save_prefs(self.graphics_prefs);
+                Task::none()
+            }
+
             Message::CursorSizeChanged(value) => {
                 self.cursor_size = value.clamp(1, 100);
                 self.persist_settings_if_changed();
@@ -8976,16 +8997,7 @@ impl OpenCADStudio {
             }
 
             Message::AboutCopyInfo => {
-                let info = format!(
-                    "Open CAD Studio v{}\nRevision: {}\nCommit date: {}\nProfile: {}\nFeatures: {}\nOS: {}\nArch: {}",
-                    env!("OCS_FULL_VERSION"),
-                    env!("OCS_GIT_REV"),
-                    env!("OCS_COMMIT_DATE"),
-                    env!("OCS_BUILD_PROFILE"),
-                    env!("OCS_BUILD_FEATURES"),
-                    crate::ui::window::about::platform_name(),
-                    crate::ui::window::about::architecture_name(),
-                );
+                let info = crate::ui::window::about::report();
                 #[cfg(target_arch = "wasm32")]
                 {
                     crate::sys::write_clipboard_text(&info);

src/app/view/modal.rs

@@ -332,6 +332,16 @@ impl OpenCADStudio {
                             self.spacemouse_preferences, self.spacemouse.status(),
                             self.spacemouse_paused, self.spacemouse_details,
                         ),
+                        {
+                            #[cfg(not(target_arch = "wasm32"))]
+                            let page = crate::ui::window::options::graphics::view(
+                                self.graphics_prefs,
+                                crate::gpu_backend::active_gpu(),
+                            );
+                            #[cfg(target_arch = "wasm32")]
+                            let page = iced::widget::Space::new().into();
+                            page
+                        },
                         &self.snap_angle_input,
                         &self.zoom_factor_input,
                         {