gistfile1.txt

uint32_t graphicsQueueFamIndex = UINT_MAX;
uint32_t transferQueueFamIndex = UINT_MAX;
uint32_t computeQueueFamIndex = UINT_MAX;

// TODO: are there other ways to pick queue family?
for (uint32_t i = 0; i < queueFamCount; i++)
{
	if (graphicsQueueFamIndex == UINT_MAX && supportsPresent[i] == VK_TRUE && queueFamProps[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) {
		graphicsQueueFamIndex = i;
	}

	if (computeQueueFamIndex == UINT_MAX && queueFamProps[i].queueFlags & VK_QUEUE_COMPUTE_BIT) {
		computeQueueFamIndex = i;
	}

	if (transferQueueFamIndex == UINT_MAX && queueFamProps[i].queueFlags & VK_QUEUE_TRANSFER_BIT) {
		transferQueueFamIndex = i;
	}
}

float graphicsPriority = 1.0f;
float computePriority = 0.5f;
float transferPriority = 0.0f;
VkDeviceQueueCreateInfo queueCreateInfos[3];

// we use 1 queue for each type for now
queueCreateInfos[0] = { VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO, nullptr, 0, graphicsQueueFamIndex, 1, &graphicsPriority };
queueCreateInfos[1] = { VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO, nullptr, 0, computeQueueFamIndex, 1, &computePriority };
queueCreateInfos[2] = { VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO, nullptr, 0, transferQueueFamIndex, 1, &transferPriority };

const char *deviceExtensions[] = { VK_KHR_SWAPCHAIN_EXTENSION_NAME };

// TODO: if queueCreateInfoCount is more than 1, vkCreateDevice fails
VkDevice device;
VkDeviceCreateInfo devCreateInfo{ VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO, nullptr, 0, 3, queueCreateInfos, 1, layers, 1, deviceExtensions, nullptr};
VK_CHECK_RESULT(vkCreateDevice(physDevice, &devCreateInfo, nullptr, &device));

VkQueue graphicsQueue;
vkGetDeviceQueue(device, graphicsQueueFamIndex, 0, &graphicsQueue);

VkQueue computeQueue;
vkGetDeviceQueue(device, computeQueueFamIndex, 0, &computeQueue);

VkQueue transferQueue;
vkGetDeviceQueue(device, transferQueueFamIndex, 0, &transferQueue);