More changes

engine/include/sophia/components.hpp

@@ -66,6 +66,14 @@ struct SpriteComponent {
 
   // Higher draws on top. Ties are broken by the transform's position.z.
   s32 sortOrder = 0;
+
+  // Maps the unit quad (0, 0)-(1, 1) to world space: to the sprite's
+  // rectangle around its pivot, then by `transform`.
+  glm::mat4 getModel(const TransformComponent& transform) const {
+    return transform.mat4() *
+           glm::translate(glm::mat4{1.f}, glm::vec3{-pivot * size, 0.f}) *
+           glm::scale(glm::mat4{1.f}, glm::vec3{size, 1.f});
+  }
 };
 
 struct CameraComponent {
@@ -98,6 +106,15 @@ struct CameraComponent {
     return glm::ortho(-halfWidth, halfWidth, -halfHeight, halfHeight,
                       ortho.nearPlane, ortho.farPlane);
   }
+
+  // World -> clip space for this camera placed by `transform`. The view
+  // ignores the transform's scale; zoom is the projection's job.
+  glm::mat4 getViewProjection(const TransformComponent& transform,
+                              float aspect) const {
+    glm::mat4 world = glm::translate(glm::mat4{1.f}, transform.position) *
+                      glm::mat4_cast(transform.rotation);
+    return getProjection(aspect) * glm::inverse(world);
+  }
 };
 
 }  // namespace sophia

engine/include/sophia/scene_registry.hpp

@@ -19,6 +19,8 @@ class SceneRegistry {
   const Scene& get(SceneHandle handle) const { return pool.get(handle); }
   Scene& get(SceneHandle handle) { return pool.get(handle); }
 
+  const Scene& peek(SceneHandle handle) const { return pool.get(handle); }
+
   void release(SceneHandle handle) { pool.release(handle); }
   bool isAlive(SceneHandle handle) const { return pool.isAlive(handle); }
 

engine/include/sophia/scene_view_registry.hpp

@@ -35,6 +35,10 @@ class SceneViewRegistry {
     return pool.get(handle);
   }
 
+  const SceneView& peek(SceneViewHandle handle) const {
+    return pool.get(handle);
+  }
+
   void release(SceneViewHandle handle) {
     isRenderQueueDirty = true;
     pool.release(handle);