Allow camera render target to be null

src/dawn/scene/components/display/Camera.cpp

@@ -10,7 +10,7 @@ using namespace Dawn;
 
 Camera::Camera(SceneItem *item) :
   SceneItemComponent(item),
-  renderTarget(nullptr),
+  renderTarget(item->scene->game->renderManager.getBackBuffer()),
   fov(0.785398f),// 45 degrees,
   type(CAMERA_TYPE_PERSPECTIVE),
   orthoLeft(0.0f),
@@ -52,10 +52,6 @@ glm::mat4 Camera::getProjection() {
 }
 
 RenderTarget * Camera::getRenderTarget() {
-  auto v = this->renderTarget;
-  if(this->renderTarget == nullptr) {
-    return this->getGame()->renderManager.getBackBuffer();
-  }
   return (RenderTarget*)this->renderTarget;
 }
 
@@ -80,6 +76,11 @@ void Camera::onStart() {
   useEffectWithTeardown([&]{
     auto rt = this->getRenderTarget();
     this->projectionNeedsUpdating = true;
+    if(rt == nullptr) {
+      return evtResized = [&]{
+
+      };
+    }
     this->eventRenderTargetResized.invoke(rt->getWidth(), rt->getHeight());
     
     // Subscribe to new render target resized.
@@ -100,6 +101,7 @@ void Camera::onStart() {
   
   // Sub to evt legacy, we don't invoke the useTeardown to avoid invoking
   // the state event for this camera when we don't need to.
+  if(!this->getRenderTarget()) return;
   evtResized = useEventLegacy([&](RenderTarget *rt, float_t w, float_t h){
     this->projectionNeedsUpdating = true;
     this->eventRenderTargetResized.invoke(w, h);