int sample_main(int argc, char *argv[]) {
VkResult U_ASSERT_ONLY res;
struct sample_info info = {};
char sample_title[] = "Swapchain Initialization Sample";
/*
* Set up swapchain:
* - Get supported uses for all queues
* - Try to find a queue that supports both graphics and present
* - If no queue supports both, find a present queue and make sure we have a
* graphics queue
* - Get a list of supported formats and use the first one
* - Get surface properties and present modes and use them to create a swap
* chain
* - Create swap chain buffers
* - For each buffer, create a color attachment view and set its layout to
* color attachment
*/
init_global_layer_properties(info);
init_instance_extension_names(info);
init_device_extension_names(info);
init_instance(info, sample_title);
init_enumerate_device(info);
init_connection(info);
init_window_size(info, 50, 50);
init_window(info);
/* VULKAN_KEY_START */
// Construct the surface description:
#ifdef _WIN32
VkWin32SurfaceCreateInfoKHR createInfo = {};
createInfo.sType = VK_STRUCTURE_TYPE_WIN32_SURFACE_CREATE_INFO_KHR;
createInfo.pNext = NULL;
createInfo.hinstance = info.connection;
createInfo.hwnd = info.window;
res = vkCreateWin32SurfaceKHR(info.inst, &createInfo, NULL, &info.surface);
#else // _WIN32
VkXcbSurfaceCreateInfoKHR createInfo = {};
createInfo.sType = VK_STRUCTURE_TYPE_XCB_SURFACE_CREATE_INFO_KHR;
createInfo.pNext = NULL;
createInfo.connection = info.connection;
createInfo.window = info.window;
res = vkCreateXcbSurfaceKHR(info.inst, &createInfo, NULL, &info.surface);
#endif // _WIN32
assert(res == VK_SUCCESS);
// Iterate over each queue to learn whether it supports presenting:
VkBool32 *supportsPresent =
(VkBool32 *)malloc(info.queue_count * sizeof(VkBool32));
for (uint32_t i = 0; i < info.queue_count; i++) {
vkGetPhysicalDeviceSurfaceSupportKHR(info.gpus[0], i, info.surface,
&supportsPresent[i]);
}
// Search for a graphics queue and a present queue in the array of queue
// families, try to find one that supports both
uint32_t graphicsQueueNodeIndex = UINT32_MAX;
for (uint32_t i = 0; i < info.queue_count; i++) {
if ((info.queue_props[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) != 0) {
if (supportsPresent[i] == VK_TRUE) {
graphicsQueueNodeIndex = i;
break;
}
}
}
free(supportsPresent);
// Generate error if could not find a queue that supports both a graphics
// and present
if (graphicsQueueNodeIndex == UINT32_MAX) {
std::cout << "Could not find a queue that supports both graphics and "
"present\n";
exit(-1);
}
info.graphics_queue_family_index = graphicsQueueNodeIndex;
init_device(info);
// Get the list of VkFormats that are supported:
uint32_t formatCount;
res = vkGetPhysicalDeviceSurfaceFormatsKHR(info.gpus[0], info.surface,
&formatCount, NULL);
assert(res == VK_SUCCESS);
VkSurfaceFormatKHR *surfFormats =
(VkSurfaceFormatKHR *)malloc(formatCount * sizeof(VkSurfaceFormatKHR));
res = vkGetPhysicalDeviceSurfaceFormatsKHR(info.gpus[0], info.surface,
&formatCount, surfFormats);
assert(res == VK_SUCCESS);
// If the format list includes just one entry of VK_FORMAT_UNDEFINED,
// the surface has no preferred format. Otherwise, at least one
// supported format will be returned.
if (formatCount == 1 && surfFormats[0].format == VK_FORMAT_UNDEFINED) {
info.format = VK_FORMAT_B8G8R8A8_UNORM;
} else {
assert(formatCount >= 1);
info.format = surfFormats[0].format;
}
free(surfFormats);
VkSurfaceCapabilitiesKHR surfCapabilities;
res = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(info.gpus[0], info.surface,
&surfCapabilities);
assert(res == VK_SUCCESS);
uint32_t presentModeCount;
res = vkGetPhysicalDeviceSurfacePresentModesKHR(info.gpus[0], info.surface,
&presentModeCount, NULL);
assert(res == VK_SUCCESS);
VkPresentModeKHR *presentModes =
(VkPresentModeKHR *)malloc(presentModeCount * sizeof(VkPresentModeKHR));
res = vkGetPhysicalDeviceSurfacePresentModesKHR(
info.gpus[0], info.surface, &presentModeCount, presentModes);
assert(res == VK_SUCCESS);
VkExtent2D swapChainExtent;
// width and height are either both -1, or both not -1.
if (surfCapabilities.currentExtent.width == (uint32_t)-1) {
// If the surface size is undefined, the size is set to
// the size of the images requested.
swapChainExtent.width = info.width;
swapChainExtent.height = info.height;
} else {
// If the surface size is defined, the swap chain size must match
swapChainExtent = surfCapabilities.currentExtent;
}
// If mailbox mode is available, use it, as is the lowest-latency non-
// tearing mode. If not, try IMMEDIATE which will usually be available,
// and is fastest (though it tears). If not, fall back to FIFO which is
// always available.
VkPresentModeKHR swapchainPresentMode = VK_PRESENT_MODE_FIFO_KHR;
for (size_t i = 0; i < presentModeCount; i++) {
if (presentModes[i] == VK_PRESENT_MODE_MAILBOX_KHR) {
swapchainPresentMode = VK_PRESENT_MODE_MAILBOX_KHR;
break;
}
if ((swapchainPresentMode != VK_PRESENT_MODE_MAILBOX_KHR) &&
(presentModes[i] == VK_PRESENT_MODE_IMMEDIATE_KHR)) {
swapchainPresentMode = VK_PRESENT_MODE_IMMEDIATE_KHR;
}
}
// Determine the number of VkImage's to use in the swap chain (we desire to
// own only 1 image at a time, besides the images being displayed and
// queued for display):
uint32_t desiredNumberOfSwapChainImages =
surfCapabilities.minImageCount + 1;
if ((surfCapabilities.maxImageCount > 0) &&
(desiredNumberOfSwapChainImages > surfCapabilities.maxImageCount)) {
// Application must settle for fewer images than desired:
desiredNumberOfSwapChainImages = surfCapabilities.maxImageCount;
}
VkSurfaceTransformFlagBitsKHR preTransform;
if (surfCapabilities.supportedTransforms &
VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR) {
preTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
} else {
preTransform = surfCapabilities.currentTransform;
}
VkSwapchainCreateInfoKHR swap_chain = {};
swap_chain.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
swap_chain.pNext = NULL;
swap_chain.surface = info.surface;
swap_chain.minImageCount = desiredNumberOfSwapChainImages;
swap_chain.imageFormat = info.format;
swap_chain.imageExtent.width = swapChainExtent.width;
swap_chain.imageExtent.height = swapChainExtent.height;
swap_chain.preTransform = preTransform;
swap_chain.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
swap_chain.imageArrayLayers = 1;
swap_chain.presentMode = swapchainPresentMode;
swap_chain.oldSwapchain = NULL;
swap_chain.clipped = true;
swap_chain.imageColorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR;
swap_chain.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
swap_chain.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
swap_chain.queueFamilyIndexCount = 0;
swap_chain.pQueueFamilyIndices = NULL;
res =
vkCreateSwapchainKHR(info.device, &swap_chain, NULL, &info.swap_chain);
assert(res == VK_SUCCESS);
res = vkGetSwapchainImagesKHR(info.device, info.swap_chain,
&info.swapchainImageCount, NULL);
assert(res == VK_SUCCESS);
VkImage *swapchainImages =
(VkImage *)malloc(info.swapchainImageCount * sizeof(VkImage));
assert(swapchainImages);
res = vkGetSwapchainImagesKHR(info.device, info.swap_chain,
&info.swapchainImageCount, swapchainImages);
assert(res == VK_SUCCESS);
info.buffers.resize(info.swapchainImageCount);
// Going to need a command buffer to send the memory barriers in
// set_image_layout but we couldn't have created one before we knew
// what our graphics_queue_family_index is, but now that we have it,
// create the command buffer
init_command_pool(info);
init_command_buffer(info);
execute_begin_command_buffer(info);
vkGetDeviceQueue(info.device, info.graphics_queue_family_index, 0,
&info.queue);
for (uint32_t i = 0; i < info.swapchainImageCount; i++) {
VkImageViewCreateInfo color_image_view = {};
color_image_view.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
color_image_view.pNext = NULL;
color_image_view.format = info.format;
color_image_view.components.r = VK_COMPONENT_SWIZZLE_R;
color_image_view.components.g = VK_COMPONENT_SWIZZLE_G;
color_image_view.components.b = VK_COMPONENT_SWIZZLE_B;
color_image_view.components.a = VK_COMPONENT_SWIZZLE_A;
color_image_view.subresourceRange.aspectMask =
VK_IMAGE_ASPECT_COLOR_BIT;
color_image_view.subresourceRange.baseMipLevel = 0;
color_image_view.subresourceRange.levelCount = 1;
color_image_view.subresourceRange.baseArrayLayer = 0;
color_image_view.subresourceRange.layerCount = 1;
color_image_view.viewType = VK_IMAGE_VIEW_TYPE_2D;
color_image_view.flags = 0;
info.buffers[i].image = swapchainImages[i];
set_image_layout(info, info.buffers[i].image, VK_IMAGE_ASPECT_COLOR_BIT,
VK_IMAGE_LAYOUT_UNDEFINED,
VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
color_image_view.image = info.buffers[i].image;
res = vkCreateImageView(info.device, &color_image_view, NULL,
&info.buffers[i].view);
assert(res == VK_SUCCESS);
}
free(swapchainImages);
execute_end_command_buffer(info);
execute_queue_command_buffer(info);
/* VULKAN_KEY_END */
/* Clean Up */
VkCommandBuffer cmd_bufs[1] = {info.cmd};
vkFreeCommandBuffers(info.device, info.cmd_pool, 1, cmd_bufs);
vkDestroyCommandPool(info.device, info.cmd_pool, NULL);
for (uint32_t i = 0; i < info.swapchainImageCount; i++) {
vkDestroyImageView(info.device, info.buffers[i].view, NULL);
}
vkDestroySwapchainKHR(info.device, info.swap_chain, NULL);
destroy_device(info);
destroy_window(info);
destroy_instance(info);
return 0;
}
bool select_device(std::vector<VkPhysicalDevice> &devices, VkPhysicalDevice &chosen_device)
{
bool suitable_dev_found = false;
unsigned int best_score = 0;
for (const auto& device : devices)
{
unsigned int score = 0;
VkPhysicalDeviceProperties deviceProperties;
VkPhysicalDeviceFeatures deviceFeatures;
vkGetPhysicalDeviceProperties(device, &deviceProperties);
vkGetPhysicalDeviceFeatures(device, &deviceFeatures);
if(deviceProperties.deviceType == VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU){score+= 1000;}
if(!deviceFeatures.geometryShader){score-= 1000000;}
uint32_t queueFamilyCount = 0;
vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, nullptr);
std::vector<VkQueueFamilyProperties> queueFamilies(queueFamilyCount);
vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, queueFamilies.data());
/*checks that all the needed queue families are supported */
bool graphics_found = false, present_found = false;
int i = 0;
for(const auto& queueFamily : queueFamilies)
{
if (!graphics_found && queueFamily.queueCount > 0 && queueFamily.queueFlags & VK_QUEUE_GRAPHICS_BIT)
{
graphics_found = true;
graphics_queue_family_index = i;
}
VkBool32 presentSupport = false;
vkGetPhysicalDeviceSurfaceSupportKHR(device, i, surface, &presentSupport);
if (!present_found && queueFamily.queueCount > 0 && presentSupport)
{
present_found = true;
present_queue_family_index = i;
}
if(present_found && graphics_found){break;}//if it finds both there is no point in keeping looking for queue families
i++;
}
if(!(graphics_found && present_found)){continue;}//if it didn't find both cues go to next device
/*checking for device specific extnsions support*/
uint32_t extensionCount;
vkEnumerateDeviceExtensionProperties(device, nullptr, &extensionCount, nullptr);
std::vector<VkExtensionProperties> availableExtensions(extensionCount);
vkEnumerateDeviceExtensionProperties(device, nullptr, &extensionCount, availableExtensions.data());
std::set<std::string> requiredExtensions(device_extensions.begin(), device_extensions.end());
for (const auto& extension : availableExtensions)
{
requiredExtensions.erase(extension.extensionName);
}
if(!requiredExtensions.empty()){continue;}
/*checks that swap chains are supported*/
bool swapChainAdequate = false;
SwapChainSupportDetails swapChainSupport = query_swap_chain_support(device);
swapChainAdequate = !swapChainSupport.formats.empty() && !swapChainSupport.presentModes.empty();
if(score >= best_score)
{
chosen_device = device;
suitable_dev_found = true;
best_score = score;
}
if(!swapChainAdequate){continue;}
}
return suitable_dev_found; //if no device is found
}