Method FindOrLoadRenderModel

samples/hellovr_vulkan/hellovr_vulkan_main.cpp:3254–3358

----------------------------------------------------------------------------- Purpose: Finds a render model we've already loaded or loads a new one -----------------------------------------------------------------------------

// Purpose: Finds a render model we've already loaded or loads a new one
//-----------------------------------------------------------------------------
VulkanRenderModel *CMainApplication::FindOrLoadRenderModel( vr::TrackedDeviceIndex_t unTrackedDeviceIndex, const char *pchRenderModelName )
{
	VulkanRenderModel *pRenderModel = NULL;
	// To simplify the Vulkan rendering code, create an instance of the model for each model name.  This is less efficient
	// memory wise, but simplifies the rendering code so we can store the transform in a constant buffer associated with
	// the model itself.  You would not want to do this in a production application.
	//for( std::vector< VulkanRenderModel * >::iterator i = m_vecRenderModels.begin(); i != m_vecRenderModels.end(); i++ )
	//{
		//if( !stricmp( (*i)->GetName().c_str(), pchRenderModelName ) )
		//{
			//pRenderModel = *i;
			//break;
		//}
	//}

	// load the model if we didn't find one
	if( !pRenderModel )
	{
		vr::RenderModel_t *pModel;
		vr::EVRRenderModelError error;
		while ( 1 )
		{
			error = vr::VRRenderModels()->LoadRenderModel_Async( pchRenderModelName, &pModel );
			if ( error != vr::VRRenderModelError_Loading )
				break;

			ThreadSleep( 1 );
		}

		if ( error != vr::VRRenderModelError_None )
		{
			dprintf( "Unable to load render model %s - %s\n", pchRenderModelName, vr::VRRenderModels()->GetRenderModelErrorNameFromEnum( error ) );
			return NULL; // move on to the next tracked device
		}

		vr::RenderModel_TextureMap_t *pTexture;
		while ( 1 )
		{
			error = vr::VRRenderModels()->LoadTexture_Async( pModel->diffuseTextureId, &pTexture );
			if ( error != vr::VRRenderModelError_Loading )
				break;

			ThreadSleep( 1 );
		}

		if ( error != vr::VRRenderModelError_None )
		{
			dprintf( "Unable to load render texture id:%d for render model %s\n", pModel->diffuseTextureId, pchRenderModelName );
			vr::VRRenderModels()->FreeRenderModel( pModel );
			return NULL; // move on to the next tracked device
		}

		pRenderModel = new VulkanRenderModel( pchRenderModelName );
		VkDescriptorSet pDescriptorSets[ 2 ] =
		{
			m_pDescriptorSets[ DESCRIPTOR_SET_LEFT_EYE_RENDER_MODEL0 + unTrackedDeviceIndex ],
			m_pDescriptorSets[ DESCRIPTOR_SET_RIGHT_EYE_RENDER_MODEL0 + unTrackedDeviceIndex ],
		};