changes for ImGui

engine/src/ui/panel_registry.cpp

@@ -0,0 +1,88 @@
+#include <sophia/ui/panel_registry.hpp>
+#include <sophia/util/assert.hpp>
+
+namespace sophia {
+
+namespace {
+constexpr u32 GENERATION_MASK = (1u << 12) - 1;
+}  // namespace
+
+PanelHandle PanelRegistry::add(std::unique_ptr<Panel> panel) {
+  if (!freeList.empty()) {
+    u32 index = freeList.back();
+    freeList.pop_back();
+    slots[index].panel = std::move(panel);
+    return PanelHandle{index, slots[index].generation};
+  }
+
+  slots.push_back(Slot{std::move(panel), 0});
+  return PanelHandle{static_cast<u32>(slots.size() - 1), 0};
+}
+
+const Panel& PanelRegistry::get(PanelHandle handle) const {
+  SOPHIA_ASSERT(handle.isValid(), "invalid PanelHandle");
+  SOPHIA_ASSERT(handle.index < slots.size(),
+                "PanelHandle index out of range:", handle.index);
+
+  const Slot& slot = slots[handle.index];
+  SOPHIA_ASSERT(slot.generation == handle.generation,
+                "stale PanelHandle (generation mismatch):", handle.index);
+  SOPHIA_ASSERT(slot.panel != nullptr,
+                "PanelHandle refers to a removed panel:", handle.index);
+  return *slot.panel;
+}
+
+void PanelRegistry::remove(PanelHandle handle) {
+  SOPHIA_ASSERT(handle.isValid(), "invalid PanelHandle");
+  SOPHIA_ASSERT(handle.index < slots.size(),
+                "PanelHandle index out of range:", handle.index);
+
+  Slot& slot = slots[handle.index];
+  SOPHIA_ASSERT(slot.generation == handle.generation,
+                "stale PanelHandle (generation mismatch):", handle.index);
+  SOPHIA_ASSERT(slot.panel != nullptr,
+                "PanelHandle already removed:", handle.index);
+
+  slot.panel.reset();
+  slot.generation = (slot.generation + 1) & GENERATION_MASK;
+  freeList.push_back(handle.index);
+}
+
+bool PanelRegistry::isValid(PanelHandle handle) const {
+  if (!handle.isValid() || handle.index >= slots.size()) {
+    return false;
+  }
+
+  const Slot& slot = slots[handle.index];
+  return slot.generation == handle.generation && slot.panel != nullptr;
+}
+
+u32 PanelRegistry::size() const {
+  u32 count = 0;
+  for (const Slot& slot : slots) {
+    if (slot.panel) {
+      count++;
+    }
+  }
+  return count;
+}
+
+u32 PanelRegistry::visibleCount() const {
+  u32 count = 0;
+  for (const Slot& slot : slots) {
+    if (slot.panel && slot.panel->isVisible()) {
+      count++;
+    }
+  }
+  return count;
+}
+
+void PanelRegistry::update(const FrameInfo& frameInfo) {
+  for (auto& slot : slots) {
+    if (slot.panel && slot.panel->isVisible()) {
+      slot.panel->onUpdate(frameInfo);
+    }
+  }
+}
+
+}  // namespace sophia