Method CreateFrameBuffer

samples/hellovr_vulkan/hellovr_vulkan_main.cpp:2584–2774

----------------------------------------------------------------------------- Purpose: Creates a frame buffer. Returns true if the buffer was set up. Returns false if the setup failed. -----------------------------------------------------------------------------

//          Returns false if the setup failed.
//-----------------------------------------------------------------------------
bool CMainApplication::CreateFrameBuffer( int nWidth, int nHeight, FramebufferDesc &framebufferDesc )
{
	//---------------------------//
	//    Create color target    //
	//---------------------------//
	VkImageCreateInfo imageCreateInfo = { VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO };
	imageCreateInfo.imageType = VK_IMAGE_TYPE_2D;
	imageCreateInfo.extent.width = nWidth;
	imageCreateInfo.extent.height = nHeight;
	imageCreateInfo.extent.depth = 1;
	imageCreateInfo.mipLevels = 1;
	imageCreateInfo.arrayLayers = 1;
	imageCreateInfo.format = VK_FORMAT_R8G8B8A8_SRGB;
	imageCreateInfo.tiling = VK_IMAGE_TILING_OPTIMAL;
	imageCreateInfo.samples = ( VkSampleCountFlagBits ) m_nMSAASampleCount;
	imageCreateInfo.usage = ( VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_TRANSFER_SRC_BIT );
	imageCreateInfo.flags = 0;

	VkResult nResult;
	nResult = vkCreateImage( m_pDevice, &imageCreateInfo, nullptr, &framebufferDesc.m_pImage );
	if ( nResult != VK_SUCCESS )
	{
		dprintf( "vkCreateImage failed for eye image with error %d\n", nResult );
		return false;
	}
	VkMemoryRequirements memoryRequirements = {};
	vkGetImageMemoryRequirements( m_pDevice, framebufferDesc.m_pImage, &memoryRequirements );

	VkMemoryAllocateInfo memoryAllocateInfo = { VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO };
	memoryAllocateInfo.allocationSize = memoryRequirements.size;
	if ( !MemoryTypeFromProperties( m_physicalDeviceMemoryProperties, memoryRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, &memoryAllocateInfo.memoryTypeIndex ) )
	{
		dprintf( "Failed to find memory type matching requirements.\n" );
		return false;
	}

	nResult = vkAllocateMemory( m_pDevice, &memoryAllocateInfo, nullptr, &framebufferDesc.m_pDeviceMemory );
	if ( nResult != VK_SUCCESS )
	{
		dprintf( "Failed to find memory for image.\n" );
		return false;
	}

	nResult = vkBindImageMemory( m_pDevice, framebufferDesc.m_pImage, framebufferDesc.m_pDeviceMemory, 0 );
	if ( nResult != VK_SUCCESS )
	{
		dprintf( "Failed to bind memory for image.\n" );
		return false;
	}

	VkImageViewCreateInfo imageViewCreateInfo = { VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO };
	imageViewCreateInfo.flags = 0;
	imageViewCreateInfo.image = framebufferDesc.m_pImage;
	imageViewCreateInfo.viewType = VK_IMAGE_VIEW_TYPE_2D;
	imageViewCreateInfo.format = imageCreateInfo.format;
	imageViewCreateInfo.components = { VK_COMPONENT_SWIZZLE_IDENTITY, VK_COMPONENT_SWIZZLE_IDENTITY, VK_COMPONENT_SWIZZLE_IDENTITY, VK_COMPONENT_SWIZZLE_IDENTITY };
	imageViewCreateInfo.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
	imageViewCreateInfo.subresourceRange.baseMipLevel = 0;