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egl: preserve caller state and support surfaceless offscreen contexts #12

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Merged
tritao merged 2 commits into from
Sep 1, 2026
Merged

egl: preserve caller state and support surfaceless offscreen contexts #12

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708979f
egl: preserve caller state and support surfaceless contexts
tritao Aug 11, 2026
6370636
tests: cover EGL context preservation
tritao Aug 11, 2026
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2 changes: 1 addition & 1 deletion .github/workflows/continuous-integration-workflow.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ jobs:
- name: Create build directory and run CMake
run: |
sudo apt-get -y update
sudo apt-get -y install freeglut3-dev
sudo apt-get -y install freeglut3-dev libegl1-mesa-dev
cmake -S . -B cmake_build_dir -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=cmake_install_dir -DCOIN_BUILD_LEGACY_GL_RENDERER=ON -DCOIN_BUILD_TESTS=ON -DCOIN_STRICT_WARNINGS=ON
- name: Build project
run: cmake --build cmake_build_dir --target install --config Release --parallel
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6 changes: 6 additions & 0 deletions src/glue/gl.cpp
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Expand Up @@ -120,6 +120,11 @@
initialization spit out lots of info about the underlying OpenGL
implementation.

- COIN_EGL: set to "1" to select EGL for offscreen contexts, or to "0"
to select GLX when both bindings are available. If unset, Coin selects
the binding associated with the current context and otherwise defaults to
GLX.

- COIN_PREFER_GLPOLYGONOFFSET_EXT: when set to "1" and both
glPolygonOffset() and glPolygonOffsetEXT() are available, the
latter will be used. This can be useful to work around a
Expand Down Expand Up @@ -4384,6 +4389,7 @@ cc_glglue_context_create_offscreen(unsigned int width, unsigned int height)
#elif defined(HAVE_WGL)
return wglglue_context_create_offscreen(width, height);
#else
check_egl();
#if defined(HAVE_EGL)
if (COIN_USE_EGL > 0) return eglglue_context_create_offscreen(width, height);
#endif
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