adding and integrating ImGuizmo

editor/panels/inspector_panel.cpp

@@ -6,6 +6,7 @@
 #include <sophia/components.hpp>
 
 void InspectorPanel::onUpdate(const sophia::FrameInfo&) {
+  selected = context.selected;
   if (!selected) {
     ImGui::TextDisabled("No entity selected");
     return;
@@ -16,6 +17,7 @@ void InspectorPanel::onUpdate(const sophia::FrameInfo&) {
   drawTransform();
   drawCamera();
   drawSprite();
+  drawMesh();
 
   ImGui::Separator();
   drawAddComponent();
@@ -40,11 +42,13 @@ void InspectorPanel::drawTransform() {
   auto& transform = selected.getComponent<sophia::TransformComponent>();
   ImGui::DragFloat3("Position", &transform.position.x, 0.1f);
 
-  // 2D only: edits rotation around Z and drops any X/Y rotation.
-  float degrees = glm::degrees(glm::eulerAngles(transform.rotation).z);
-  if (ImGui::DragFloat("Rotation", &degrees, 1.0f)) {
-    transform.rotation =
-        glm::angleAxis(glm::radians(degrees), glm::vec3{0.f, 0.f, 1.f});
+  // Euler angles in degrees, recomputed from the quaternion every frame.
+  // Near 90 degrees of pitch the angles can jump between equivalent values
+  // while dragging.
+  // TODO: keep each entity's edited angles, or replace with gizmo rotation.
+  glm::vec3 degrees = glm::degrees(glm::eulerAngles(transform.rotation));
+  if (ImGui::DragFloat3("Rotation", &degrees.x, 1.0f)) {
+    transform.rotation = glm::quat{glm::radians(degrees)};
   }
 
   ImGui::DragFloat3("Scale", &transform.scale.x, 0.1f);
@@ -118,6 +122,29 @@ void InspectorPanel::drawSprite() {
   }
 }
 
+void InspectorPanel::drawMesh() {
+  if (!selected.hasComponent<sophia::MeshComponent>()) {
+    return;
+  }
+
+  bool open = true;
+  if (!ImGui::CollapsingHeader("Mesh", &open, ImGuiTreeNodeFlags_DefaultOpen)) {
+    if (!open) {
+      selected.removeComponent<sophia::MeshComponent>();
+    }
+    return;
+  }
+
+  auto& mesh = selected.getComponent<sophia::MeshComponent>();
+  // TODO: pick the mesh once assets have names.
+  ImGui::Text("Mesh: %u", static_cast<sophia::u32>(mesh.handle.index));
+  ImGui::ColorEdit3("Color", &mesh.color.x);
+
+  if (!open) {
+    selected.removeComponent<sophia::MeshComponent>();
+  }
+}
+
 void InspectorPanel::drawAddComponent() {
   if (ImGui::Button("Add Component")) {
     ImGui::OpenPopup("AddComponent");