show loading icon for proxy generation

rendering/framebuffercollection.cpp

@@ -0,0 +1,68 @@
+#include "framebuffercollection.h"
+
+FramebufferCollection::FramebufferCollection()
+{
+
+}
+
+void FramebufferCollection::Create(QOpenGLContext* ctx,
+                                   int width,
+                                   int height,
+                                   int count)
+{
+  Q_ASSERT(count > 1);
+
+  fbo_.resize(count);
+  for (int i=0;i<fbo_.size();i++) {
+    fbo_[i].Create(ctx, width, height);
+  }
+  fbo_index_ = -1;
+}
+
+void FramebufferCollection::Destroy()
+{
+  fbo_.clear();
+}
+
+GLuint FramebufferCollection::CurrentTexture()
+{
+  if (!IsCreated() || fbo_index_ < 0) {
+    return 0;
+  }
+
+  return fbo_.at(fbo_index_%fbo_.size()).texture();
+}
+
+const FramebufferObject& FramebufferCollection::CurrentFramebuffer()
+{
+  Q_ASSERT(IsCreated());
+
+  return fbo_.at(fbo_index_%fbo_.size());
+}
+
+const FramebufferObject& FramebufferCollection::NextFramebuffer()
+{
+  fbo_index_++;
+
+  return CurrentFramebuffer();
+}
+
+bool FramebufferCollection::TextureBelongsToCollection(GLuint tex)
+{
+  if (tex == 0) {
+    return false;
+  }
+
+  for (int i=0;i<fbo_.size();i++) {
+    if (fbo_.at(i).texture() == tex) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool FramebufferCollection::IsCreated()
+{
+  return !fbo_.isEmpty();
+}