message: Updated multithreading sample to explicitly call drawUI (updated ImGUI version)
  Refs
diff: class VulkanExample : public VulkanExampleBase
  {
  public:
  + bool displaySkybox = true;
  +
  // Vertex layout for the models
  vks::VertexLayout vertexLayout = vks::VertexLayout({
  vks::VERTEX_COMPONENT_POSITION,
  @@ -318,6 +320,8 @@ public:
  vkCmdBindPipeline(secondaryCommandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.starsphere);
  + if (displaySkybox) {
  +
  glm::mat4 view = glm::mat4(1.0f);
  view = glm::rotate(view, glm::radians(rotation.x), glm::vec3(1.0f, 0.0f, 0.0f));
  view = glm::rotate(view, glm::radians(rotation.y), glm::vec3(0.0f, 1.0f, 0.0f));
  @@ -337,6 +341,13 @@ public:
  vkCmdBindVertexBuffers(secondaryCommandBuffer, 0, 1, &models.skysphere.vertices.buffer, offsets);
  vkCmdBindIndexBuffer(secondaryCommandBuffer, models.skysphere.indices.buffer, 0, VK_INDEX_TYPE_UINT32);
  vkCmdDrawIndexed(secondaryCommandBuffer, models.skysphere.indexCount, 1, 0, 0, 0);
  + }
  +
  + // With VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS, the primary command buffer's content has to be defined
  + // by secondary command buffers, which also applies to the UI overlay command buffer
  + if (settings.overlay) {
  + drawUI(secondaryCommandBuffer);
  + }
  VK_CHECK_RESULT(vkEndCommandBuffer(secondaryCommandBuffer));
  }
  @@ -633,6 +644,10 @@ public:
  if (overlay->header("Statistics")) {
  overlay->text("Active threads: %d", numThreads);
  }
  + if (overlay->header("Settings")) {
  + overlay->checkBox("Skybox", &displaySkybox);
  + }
  +
  }
  };
  