feat: add click to select

destrum/src/App.cpp

@@ -8,6 +8,7 @@
 #include <destrum/FS/AssetFS.h>
 #include <destrum/Graphics/Resources/FontCache.h>
 #include <destrum/ObjectModel/GameObject.h>
+#include <destrum/ObjectModel/Transform.h>
 #include <destrum/Scene/Scene.h>
 #include <destrum/Scene/SceneManager.h>
 #include <destrum/Serialization/SceneSerializer.h>
@@ -234,6 +235,7 @@ if (!isRunning) break;
         {
             ZoneScopedN("Debug ImGui");
             drawWindowsMenu();
+            applySelectionPick();
             drawViewportWindow();
 
             if (m_DebugWindows.inspector)
@@ -380,6 +382,7 @@ if (!isRunning) break;
 
         {
             ZoneScopedN("customDraw");
+            renderer.setSelectionPassEnabled(canPickInViewport());
             customDraw();
         }
 
@@ -549,10 +552,52 @@ void App::drawViewportWindow()
 
     ImGui::SetCursorScreenPos(origin);
     drawViewportOverlay();
+    requestSelectionPick();
 
     ImGui::End();
 }
 
+void App::requestSelectionPick()
+{
+    if (!canPickInViewport() || !viewportHovered || viewportMouseClaimed ||
+        !ImGui::IsMouseClicked(ImGuiMouseButton_Left))
+    {
+        return;
+    }
+
+    const ImVec2 mouse = ImGui::GetMousePos();
+    const glm::vec2 uv = (glm::vec2{mouse.x, mouse.y} - viewportRect.min) / viewportRect.size;
+    if (uv.x < 0.0f || uv.y < 0.0f || uv.x >= 1.0f || uv.y >= 1.0f)
+    {
+        return;
+    }
+
+    const VkExtent3D extent = renderer.getDrawImage().extent;
+    renderer.requestSelectionPick(glm::ivec2{uv * glm::vec2{static_cast<float>(extent.width), static_cast<float>(extent.height)}});
+    pickSelectsParent = ImGui::GetIO().KeyAlt;
+}
+
+void App::applySelectionPick()
+{
+    const auto picked = renderer.takeSelectionPick();
+    auto& sceneManager = SceneManager::GetInstance();
+    if (!picked || sceneManager.GetActiveScenes().empty())
+    {
+        return;
+    }
+
+    Scene& scene = sceneManager.GetCurrentScene();
+    GameObject* object = scene.FindGameObject(*picked);
+    if (object != nullptr && pickSelectsParent)
+    {
+        if (const Transform* parent = object->GetTransform().GetParent(); parent != nullptr && parent->GetOwner() != nullptr)
+        {
+            object = parent->GetOwner();
+        }
+    }
+    scene.SetSelectedObject(object != nullptr ? object->GetId() : InvalidObjectId);
+}
+
 void App::applyViewportResize()
 {
     if (viewportDesiredSize.x <= 0 || viewportDesiredSize.y <= 0)