Add CI for SIGGRAPH 2026 tutorial

[SaschaWillems]

There is no CI yet for the SIGGRAPH 2026 tutorial, so if anything breaks (like in #513), we're not noticing that. This PR adds CI for the SIGGRAPH 2026 tutorial to close that gap.

Note: Currently a draft.

[SaschaWillems]

Interestingly this fails on Linux, not due to an issue with CI, but an actual issue with the code itself. So adding CI for this already seems to show benefits :)

[iagoCL]

Thank you very much for adding the CI workflow. I think it will be useful going forward.

I tried building the tutorial again on my Linux machine. It initially compiled successfully, but after updating Clang I was able to partially reproduce the issue.

I can fix the part I reproduced with the following change:

diff --git a/attachments/siggraph2026_vk_tutorial/src/main.cpp b/attachments/siggraph2026_vk_tutorial/src/main.cpp
index e44ed50..f0f0d94 100644
--- a/attachments/siggraph2026_vk_tutorial/src/main.cpp
+++ b/attachments/siggraph2026_vk_tutorial/src/main.cpp
@@ -538,7 +538,7 @@ void Application::initVulkanVKB()

         // Store format and extent of the swapchain images for later use.
         {
-            m_swapchainFormat = vk::Format{m_vkbData.m_swapchain.image_format};
+            m_swapchainFormat = static_cast<vk::Format>(m_vkbData.m_swapchain.image_format);
             m_swapchainExtent = vk::Extent2D{
                 .width = m_vkbData.m_swapchain.extent.width,
                 .height = m_vkbData.m_swapchain.extent.height,

I am not sure why this does not trigger on Windows, but I think we can simply fix it.

When using Vulkan, I do not think we should have to specify every initializer. Designated initializers make Vulkan code significantly less verbose and allow us to omit pNext and other unnecessary fields.

In theory, -Wno-missing-designated-field-initializers should solve the problem by allowing unused fields to be omitted when designated initializers are used.

Which version of Clang is installed in CI?

warning: unknown warning option '-Wno-missing-designated-field-initializers'; did you mean '-Wno-missing-field-initializers'? [-Wunknown-warning-option]

As a workaround, we could also disable -Wmissing-field-initializers for the Linux Clang build, although I do not think this should be necessary:

diff --git a/attachments/siggraph2026_vk_tutorial/CMakeLists.txt b/attachments/siggraph2026_vk_tutorial/CMakeLists.txt
index 88cdda9..734b66f 100644
--- a/attachments/siggraph2026_vk_tutorial/CMakeLists.txt
+++ b/attachments/siggraph2026_vk_tutorial/CMakeLists.txt
@@ -293,7 +293,7 @@ if(MSVC)
 else()
   target_compile_options(vulkan_siggraph PRIVATE -Wall -Wextra -Wpedantic)
   if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-    target_compile_options(vulkan_siggraph PRIVATE -Wno-missing-designated-field-initializers)
+    target_compile_options(vulkan_siggraph PRIVATE -Wno-missing-designated-field-initializers -Wno-missing-field-initializers)
   endif()
 endif()

[SaschaWillems]

Looking at the CI failure, I don't think that the issue is caused by the missing initializers. That does cause a few warnings, but the error is an actual type conversion error:

  541 |             m_swapchainFormat = vk::Format{m_vkbData.m_swapchain.image_format};