当前正在尝试创建一个主循环,以显示来自交换链的图像:
void loop(struct Context *ctx, void(*loopfn)(struct Context*)) {
VkQueue queue;
vkGetDeviceQueue(ctx->objects.device, 0, 0, &queue);
while (!glfwWindowShouldClose(ctx->window)) {
VkResult fenceStatus = vkGetFenceStatus(ctx->objects.device, ctx->objects.fence);
if (fenceStatus == VK_SUCCESS) {
// Reset fence and command buffer
if (vkQueuePresentKHR(queue, &ctx->objects.presentInfo) != VK_SUCCESS) {
fprintf(stderr, "Failed to present image\n");
break;
}
loopfn(ctx);
} else if (fenceStatus == VK_ERROR_DEVICE_LOST) {
fprintf(stderr, "Device lost\n");
break;
}
}
}
void loopfn(struct Context *ctx) {
// Clear color image
}
int main() {
struct Context *ctx = init(500, 500, "Test");
if (!ctx)
return -1;
loop(ctx, loopfn);
deinit(ctx);
return 0;
}
但是,看来我使用交换链扩展名的方式不正确,它会转换为来自验证层的以下错误消息,然后立即出现分段错误:
UNASSIGNED-CoreValidation-DrawState-SwapchainInvalidImage(ERROR / SPEC): msgNum: 0 - vkQueuePresentKHR: Swapchain image index too large (0). There are only 0 images in this swapchain.
Objects: 1
[0] 0x7, type: 1000001000, name: (null)
Validation(ERROR): msg_code: 0: [ UNASSIGNED-CoreValidation-DrawState-SwapchainInvalidImage ] Object: 0x7 (Type = 27) | vkQueuePresentKHR: Swapchain image index too large (0). There are only 0 images in this swapchain.
我的init
函数很长,我不知道将其放在这里是否很有用,但是我实际上正在做的(并且不起作用)是:>
按如下方式创建交换链:
VkSwapchainCreateInfoKHR swapchainInfo =
{ .sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR
, .pNext = NULL
, .flags = 0x00000000
, .surface = ctx->objects.surface
, .minImageCount = surfaceCapabilities.minImageCount
, .imageFormat = pSurfaceFormats[0].format
, .imageColorSpace = pSurfaceFormats[0].colorSpace
, .imageExtent = surfaceCapabilities.currentExtent
, .imageArrayLayers = 1
, .imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT
, .imageSharingMode = VK_SHARING_MODE_EXCLUSIVE
, .queueFamilyIndexCount = 1
, .pQueueFamilyIndices = NULL
, .preTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR
, .compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR
, .presentMode = VK_PRESENT_MODE_MAILBOX_KHR
, .clipped = VK_TRUE
, .oldSwapchain = VK_NULL_HANDLE
};
if (vkCreateSwapchainKHR(ctx->objects.device, &swapchainInfo, NULL, &ctx->objects.swapchain) != VK_SUCCESS)
goto failure;
创建彩色图像和深度图像。两个VkImageCreateInfo
结构体都有一个指向以下结构体的指针作为其pNext
值:
VkImageSwapchainCreateInfoKHR swapchainImageInfo =
{ .sType = VK_STRUCTURE_TYPE_IMAGE_SWAPCHAIN_CREATE_INFO_KHR
, .pNext = NULL
, .swapchain = ctx->objects.swapchain
};
为两个图像分配内存,然后尝试如下将它们绑定到交换链:
VkBindImageMemorySwapchainInfoKHR colorSwapchainBindInfo =
{ .sType = VK_STRUCTURE_TYPE_BIND_IMAGE_MEMORY_SWAPCHAIN_INFO_KHR
, .pNext = NULL
, .swapchain = ctx->objects.swapchain
, .imageIndex = 0
};
VkBindImageMemoryInfo colorMemBindInfo =
{ .sType = VK_STRUCTURE_TYPE_BIND_IMAGE_MEMORY_INFO
, .pNext = &colorSwapchainBindInfo
, .image = ctx->objects.colorImage
, .memory = ctx->objects.colorMemory
, .memoryOffset = 0
};
// Pretty much the same thing for the depth image
VkBindImageMemoryInfo memBindInfos[] = { colorMemBindInfo, depthMemBindInfo };
if (vkBindImageMemory2(ctx->objects.device, 2, memBindInfos) != VK_SUCCESS)
goto failure;
执行两个所需的图像布局转换(从VK_IMAGE_LAYOUT_UNDEFINED
到VK_IMAGE_LAYOUT_GENERAL
)
VkPresentInfoKHR
结构我想知道我在做错什么以及如何解决。随时要求其他精度。
编辑:我正在使用的实例扩展名是VK_KHR_surface
和VK_KHR_xcb_surface
。
uint32_t count;
const char **extensions = glfwGetRequiredInstanceExtensions(&count);
VkInstanceCreateInfo instanceInfo =
{ .sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO
, .pNext = NULL
, .flags = 0x00000000
, .pApplicationInfo = NULL
, .enabledLayerCount = 0
, .ppEnabledLayerNames = NULL
, .enabledExtensionCount = count
, .ppEnabledExtensionNames = extensions
};
我正在使用的唯一设备扩展名是VK_KHR_swapchain
:
const char *deviceExtensions[] = { "VK_KHR_swapchain" };
VkDeviceCreateInfo deviceInfo =
{ .sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO
, .pNext = NULL
, .flags = 0x00000000
, .queueCreateInfoCount = 1
, .pQueueCreateInfos = &queueInfo
, .enabledLayerCount = 0
, .ppEnabledLayerNames = NULL
, .enabledExtensionCount = sizeof(deviceExtensions) / sizeof(deviceExtensions[0])
, .ppEnabledExtensionNames = deviceExtensions
, .pEnabledFeatures = NULL
};
答案 0 :(得分:3)
对,所以这是XY问题。似乎您使用的Vulkan功能不适合您的情况。即VkImageSwapchainCreateInfoKHR
和VkBindImageMemorySwapchainInfoKHR
。根据它们的描述,它们仅对GPU组有用。但是根据您的评论,您只想以旧的无聊方式使用Swapchain。
交换链需要以特殊方式创建自己的图像。这通常是对Vulkan交换链摘要(例如X,Wayland,GDI或DXGI)的基础系统的限制。因此,您不会尝试自己创建这些图像(也不会尝试将内存绑定到它们),而是让vkCreateSwapchain
为您完成。
BTW Vulkan交换链没有用于深度图像。都是彩色图像。
因此,在vkCreate
d交换链中,您将使用vkGetSwapchainImagesKHR
获得它为您创建的图像。用法类似于:
uint32_t count;
VkResult errco = vkGetSwapchainImagesKHR( dev, swpch, &count, nullptr );
if( errco ) throw "error";
std::vector<VkImage> swapchainImages( count );
errco = vkGetSwapchainImagesKHR( dev, swpch, &count, swapchainImages.data() );
if( errco ) throw "error";
注意:从理论上讲,您获得的图像可能比vkCreateSwapchain
所要求的要多。
这些图像与VkImage
定期获得的vkCreateImage
一样好,除了以下两点:
vkDestroyImage
使用它们;而是当您致电vkDestroySwapchainKHR
时将它们销毁。这应该做介绍,并在此处解决当前的问题。