Is there any reason why vkSubmitQueue would throw an error at runtime?

[worthy cosmos]

I was trying to follow along with a tutorial to get started with vulkan, and then make more serious modifications from there. When I attempted to copy what they were doing in their drawFrame loop, however, I ran into an issue where my code wouldn't run past vkSubmitQueue.

logd("fence wait");
    vkWaitForFences(device, 1, &inFlightFences[currentFrame], VK_TRUE, UINT64_MAX);

    uint32_t imgIndex;

    VkResult result = vkAcquireNextImageKHR(device, swapchain, UINT64_MAX, 
        imgAvailableSemaphores[currentFrame], VK_NULL_HANDLE, &imgIndex);

    if (result == VK_ERROR_OUT_OF_DATE_KHR) {
        logd("recreating swapchain");
        recreateSwapchain();
        return;
    } else if (result != VK_SUCCESS && result != VK_SUBOPTIMAL_KHR) {
        logd("failing swapchain image acquisition?");
        processVkResult("Vulkan acquire next image", result);
    }

    logd("reseting fences");
    processVkResult("Vulkan reset fences",
        vkResetFences(device, 1, &inFlightFences[currentFrame]));

    logd("reseting cmd buffer");

    // TODO -- understand commented out part
    processVkResult("Vulkan reset command buffer",
        vkResetCommandBuffer(commandBuffers[currentFrame], /*VkCommandBufferResetFlagBits*/ 0));
    recordCommandBuffer(commandBuffers[currentFrame], imgIndex);

    VkSubmitInfo submitInfo {};
    submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;

    VkSemaphore waitSemaphores[] = {imgAvailableSemaphores[currentFrame]};
    VkPipelineStageFlags waitStages[] = {VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT};
    submitInfo.waitSemaphoreCount = 1;
    submitInfo.pWaitSemaphores = waitSemaphores;
    submitInfo.pWaitDstStageMask = waitStages;
    
    submitInfo.commandBufferCount = 1;
    submitInfo.pCommandBuffers = &commandBuffers[currentFrame];

    VkSemaphore signalSemaphores[] = {renderFinishedSemaphores[currentFrame]};
    submitInfo.signalSemaphoreCount = 1;
    submitInfo.pSignalSemaphores = signalSemaphores;

    logd("submitting queue to draw buffer");
    // processVkResult("Vulkan submit queue to draw buffer",
    //     vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences[currentFrame]), false);
    vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences[currentFrame]);

right after the last statement, there's another logd message that never gets printed. logd is just a macro i made that prints out the message as well as the file and line number

[tawny spruce]

What error code do you get?

[worthy cosmos]

I don't get an error code

[tawny spruce]

A failure at vkQueueSubmit is very common and may hint at undefined behaviour of your app.

[worthy cosmos]

but usually the failure would be in the form of a VkResult, right?

[tawny spruce]

Yes

[feral hill]

you need to check the return value of vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences[currentFrame]);

[tawny spruce]

if you don't do it already: enable validation layers and check errors and warnings up to the error at submission time

[feral hill]

you can do that in vkconfig without any code changes

[worthy cosmos]

I have validation layers, and I've tried checking the resulting value

[tawny spruce]

and what result did you get?

[worthy cosmos]

If I do something like

logd("submitting queue to draw buffer");

    VkResult r = vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences[currentFrame]);
   
logd("r: " << r);

the program still quits before the debug line is reached

[feral hill]

maybe run with a debugger

I suspect something is null and you're getting a seg fault

[worthy cosmos]

That's likely the case, I should probably check every argument there isn't secretly null, although i dont know how that'd happen

any debugger recommendations?

[feral hill]

you don't really have a choice in debuggers

gdb for gcc/clang

and whatever visual studio uses for msvc

[worthy cosmos]

thanks

[jade linden]

the chance of this is very low but, are you sure that vkQueueSubmit function loaded correctly?