All examples only show black screen

[mosra]

All examples only show black screen

[yurivict]

Is the black screen really black (#000000) or showing at least the default clear color (#1f1f1f)?

The color is (#1f1f1f).

Is there any difference if you build for desktop OpenGL instead of ES?

Removing TARGET_GLES in magnum config made the problem to go away.

Is this a platform with X11? Or Wayland?

X11, FreeBSD 11.2 amd64

[mosra]

What platform is this? Is the black screen really black (#000000) or showing at least the default clear color (#1f1f1f)? Is there any difference if you build for desktop OpenGL instead of ES? Is this a platform with X11? Or Wayland?

I have to admit there are some corner cases (especially involving desktops using EGL instead of GLX and non-X11 Linux/BSD platforms) where function pointer loading is tested less than ideally, and thus for example the driver is just executing some dummy functions instead of actually making the GPU draw stuff. Are you able to use ApiTrace or Renderdoc there to debug things further?

[mosra]

Hmm. Not sure how to continue here. Testing here with TARGET_GLES enabled, both of these do exactly what told:

$ ./src/triangle/magnum-triangle 
Renderer: Mesa DRI Intel(R) HD Graphics 630 (Kaby Lake GT2)  by Intel Open Source Technology Center
OpenGL version: OpenGL ES 3.2 Mesa 18.3.3
Using optional features:
    GL_EXT_multi_draw_arrays
    GL_EXT_robustness
    GL_EXT_texture_filter_anisotropic
^C
$ DRI_PRIME=1 ./src/triangle/magnum-triangle 
Renderer: AMD VEGAM (DRM 3.27.0, 4.20.10-arch1-1-ARCH, LLVM 7.0.1) by X.Org
OpenGL version: OpenGL ES 3.2 Mesa 18.3.3
Using optional features:
    GL_EXT_multi_draw_arrays
    GL_EXT_robustness
    GL_EXT_texture_filter_anisotropic

IIRC from the time when I had a NVidia, this worked well, unfortunately I don't have a machine with NV anymore.

The magnum repository has a big suite of tests for the OpenGL backed (enabled using BUILD_TESTS and BUILD_GL_TESTS). Could you run the most essential ones on the GLES build and tell me the output?

cd build
cmake -DBUILD_TESTS=ON -DBUILD_GL_TESTS=ON .
cmake --build .
ctest -V -R (GLMeshGLTest|GLBufferGLTest|GLAbstractShaderProgramGLTest)

[mosra]

Closing due to a lack of activity.