rendering issue in Ubuntu 24 when CMAKE_BUILD_TYPE is not "Release"

[asherikov]

Hello, I am trying to run rocky_demo --log-level debug --map .../geotiff.map.json, but the planet is not rendered: left half of blue sphere blinks on startup and disappears, same with default maps. The rest seems to work:

Output:

[rocky info] Running from: ...
[rocky debug] Search paths:
...
correctly point to local data dirs
...
[rocky debug]   /usr/local/share/rocky
[rocky debug] Layer "Local GeoTIFF" FAILED with status Layer closed
[rocky info] Entity compiler thread starting up.
[rocky info] Enabling: VK_EXT_debug_utils
[rocky info] Enabling: VK_KHR_fragment_shader_barycentric
[rocky info] Enabling: VK_EXT_extended_dynamic_state
[rocky info] Enabling: VK_EXT_extended_dynamic_state2
[rocky info] Enabling: VK_EXT_extended_dynamic_state3
[rocky debug] Layer "" FAILED with status Layer closed
[rocky info] Simulation thread starting.
[rocky info] Removing window...
[rocky info] All windows closed... shutting down.
[rocky info] Quitting background services...
[rocky info] Simulation thread terminating.
[rocky info] Entity compiler thread terminating.

rocky_demo --version-all:

cpp_httplib 0.27.0
entt 3.16.0
gdal 3.11.5
glm 0.9.9.8
imgui 1.91.9
nlohmann_json 3.11
openssl 3.0.13
proj 9.4
rocky 0.9.7
spdlog 1.12.0
sqlite 3.45.1
vsgxchange 1.1.7
vulkanscenegraph 1.1.11
weejobs 1.1.0
zlib 1.3

The reported glm and proj are system versions, even though cmake finds local ones:

find_package(PROJ 9.7 CONFIG REQUIRED)
find_package(glm 1.0.2 CONFIG REQUIRED)

[gwaldron]

If you click on "Map" and then the image layer, does it show any error message?

Library version mismatches could cause problems; are you saying you have multiple versions of proj and glm installed?

[asherikov]

1. Same [rocky debug] Layer "Local GeoTIFF" FAILED with status Layer closed message.
2. I've tried to build with mostly system libs at first and then started adding dependencies (these two have been added last), but behavior is the same. Tried a clean vcpkg build too, but it failed with a linking error /usr/bin/ld: ../../rocky/librocky.so.34: undefined reference to vkCreateXcbSurfaceKHR'`.

[gwaldron]

Do any of the maps work?

Regarding vkCreateXcbSurfaceKHR. My guess is that the VSG build in vcpkg is not linking to the xcb library...?

[gwaldron]

OK, I tracked this down (the vcpkg issue anyway).

The vcpkg manifest for VSG is missing the following dependency.

        {
          "name": "vulkan-loader",
          "platform" : "!(android | ios | osx | windows)",
          "features" : [ "xcb" ]
        }

Temporarily, you can add this yourself in vcpkg/ports/vsg/vcpkg.json under the "windowing" feature. And then re-run cmake.

In the meantime I will be submitting a PR to update the upstream port.

[asherikov]

1. Behavior is the same with other maps too
2. vcpkg build is now ok and demo loads maps, will take a closer look at the dependencies.

[asherikov]

Actually the issue is trigered by compilation flags, not the dependencies. I can reproduce it in vcpkg build with -DCMAKE_BUILD_TYPE=RelWithDebInfo. Could be a race of some sort.

[gwaldron]

Any update on this? If not let's close it, or you can edit the title to reflect the more exact issue. Thanks

[asherikov]

Hello, no updates from me except the one I posted in December: the issue is triggered by cmake build type and is not releated to dependencies -- can be reproduced with vcpkg build as well. I am unlikely to have time to dig into this. Can you reproduce it?
PS: I've updated the title.

[gwaldron]

Thanks.
I always build Rocky in RelWithDebInfo, with vcpkg dependencies built in Release.
I have never tried building vcpkg deps in RelWithDebInfo though - is that what you are doing?

[asherikov]

Still reproducable with the latest rocky and vcpkg.
Host: Ubuntu 24
vcpkg (still needs patching as suggested above):

commit 40c89449f0ccce12d21f8a906639f6c2c649b9e7 (HEAD -> master, origin/master, origin/HEAD)
Author: toge <toge.mail@gmail.com>
Date:   Thu Jan 29 17:32:32 2026 +0900

rocky:

commit ff9c34a26d7152b35b1920f976db36dbe7d57edf (HEAD -> main, origin/main, origin/HEAD)
Merge: c9d84007 937a71ed
Author: Glenn Waldron <gwaldron@gmail.com>
Date:   Tue Jan 27 17:14:23 2026 -0500

Build and run ./build/src/apps/rocky_demo/rocky_demo

• this is ok -> cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE=<vcpkg_path>/scripts/buildsystems/vcpkg.cmake -DCMAKE_BUILD_TYPE=Release
• this is not -> cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE=<vcpkg_path>/scripts/buildsystems/vcpkg.cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo