macOS text rendering using OpenGL backend

[demiantres]

I am playing around with the headless renderer using OpenGL backend on macOS. First, the appropriate OpenGL surface has to be used:

    QSurfaceFormat format;
    format.setRenderableType(QSurfaceFormat::OpenGL); // Use Desktop OpenGL
    format.setVersion(4, 1);  // OpenGL 3.3 Core Profile (or 4.1 for macOS)
    format.setSamples(4);
    format.setDepthBufferSize(24);
    format.setStencilBufferSize(8);
    format.setProfile(QSurfaceFormat::CoreProfile);
    m_screen.setFormat(format);

and the shader source code has to be changed from #version 300 es to #version 330 core to make the shader compile. After this most drawing works, except text (SymbolSDFTextProgram shader) which always looks like this:

Has anyone an idea/suggestion what could cause the problem?

[acalcutt]

What version of maplibre-native are you using? With the addition of the metal backend, the OpenGL backend was upgraded to a newer version (OpenGL (ES) 3.0) which macos isn't supposed to support

https://github.com/maplibre/maplibre-native/tree/opengl-2 branch still supports opengl on macos.

[demiantres]

I am aware that metal is the way to go but I did not get Metal to work for tile generation using the headless backend.

[louwers]

Sorry to hear that. macOS hasn't really been a focus recently.

You want to try Vulkan with MoltenVK, we got it to build and it seems to work great.