Method copyBuffer

examples/vulkan/Vulkan.cpp:1331–1392

Helper to copy the contents of one buffer to another buffer

    // Helper to copy the contents of one buffer to another buffer
    bool copyBuffer(VkBuffer dst, VkBuffer src, VkDeviceSize size)
    {
        // Allocate a primary command buffer out of our command pool
        VkCommandBufferAllocateInfo commandBufferAllocateInfo = VkCommandBufferAllocateInfo();
        commandBufferAllocateInfo.sType                       = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
        commandBufferAllocateInfo.level                       = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
        commandBufferAllocateInfo.commandPool                 = commandPool;
        commandBufferAllocateInfo.commandBufferCount          = 1;

        VkCommandBuffer commandBuffer = nullptr;

        if (vkAllocateCommandBuffers(device, &commandBufferAllocateInfo, &commandBuffer) != VK_SUCCESS)
            return false;

        // Begin the command buffer
        VkCommandBufferBeginInfo commandBufferBeginInfo = VkCommandBufferBeginInfo();
        commandBufferBeginInfo.sType                    = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
        commandBufferBeginInfo.flags                    = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;

        if (vkBeginCommandBuffer(commandBuffer, &commandBufferBeginInfo) != VK_SUCCESS)
        {
            vkFreeCommandBuffers(device, commandPool, 1, &commandBuffer);

            return false;
        }

        // Add our buffer copy command
        VkBufferCopy bufferCopy = VkBufferCopy();
        bufferCopy.srcOffset    = 0;
        bufferCopy.dstOffset    = 0;
        bufferCopy.size         = size;

        vkCmdCopyBuffer(commandBuffer, src, dst, 1, &bufferCopy);

        // End and submit the command buffer
        vkEndCommandBuffer(commandBuffer);

        VkSubmitInfo submitInfo       = VkSubmitInfo();
        submitInfo.sType              = VK_STRUCTURE_TYPE_SUBMIT_INFO;
        submitInfo.commandBufferCount = 1;
        submitInfo.pCommandBuffers    = &commandBuffer;

        if (vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE) != VK_SUCCESS)
        {
            vkFreeCommandBuffers(device, commandPool, 1, &commandBuffer);

            return false;
        }

        // Ensure the command buffer has been processed
        if (vkQueueWaitIdle(queue) != VK_SUCCESS)
        {
            vkFreeCommandBuffers(device, commandPool, 1, &commandBuffer);

            return false;
        }

        // Free the command buffer