Android ofPath fills are corrupted by a tess2 index-width mismatch in the current Apothecary libraries. The supplied glMatrix emulator comparison uses the latest Apothecary libraries with the core changes from #8533: the expected star is absent on OpenGL ES 1.1 and collapses to a triangle on ES 2.0, 3.0 and 3.1.
Cause
The patched tesselator.h checks ANDROID and TARGET_ANDROID to select 16-bit TESSindex, but does not recognize the NDK's __ANDROID__ macro. On affected architectures, Apothecary therefore builds tess2 with 32-bit indices while openFrameworks reads them as 16-bit. An index buffer is read as sequences such as 0 0 1 0 2 0 …, producing degenerate or incorrect triangles. This affects ofPath fills on Android.
Fix
Apothecary PR: openframeworks/apothecary#618
The PR adds __ANDROID__ to the existing 16-bit condition and increments tess2's build ID so cached archives are rebuilt. The corrected header is included with the package.
Validation and follow-up
The fix rebuilt successfully with NDK 28 for arm64-v8a, armeabi-v7a, x86 and x86_64. A linked star regression on an arm64 Android API 34 emulator reports 2-byte indices, 10 non-degenerate triangles and the expected filled area. Desktop regression retains 4-byte indices.
The image above documents the existing failure, not a post-fix rendering result. After the Apothecary PR merges and replacement Android libraries are published, refresh the libraries and rerun the glMatrix/ofPath rendering checks across ES 1.1, 2.0, 3.0 and 3.1.
Android
ofPathfills are corrupted by a tess2 index-width mismatch in the current Apothecary libraries. The supplied glMatrix emulator comparison uses the latest Apothecary libraries with the core changes from #8533: the expected star is absent on OpenGL ES 1.1 and collapses to a triangle on ES 2.0, 3.0 and 3.1.Cause
The patched
tesselator.hchecksANDROIDandTARGET_ANDROIDto select 16-bitTESSindex, but does not recognize the NDK's__ANDROID__macro. On affected architectures, Apothecary therefore builds tess2 with 32-bit indices while openFrameworks reads them as 16-bit. An index buffer is read as sequences such as0 0 1 0 2 0 …, producing degenerate or incorrect triangles. This affectsofPathfills on Android.Fix
Apothecary PR: openframeworks/apothecary#618
The PR adds
__ANDROID__to the existing 16-bit condition and increments tess2's build ID so cached archives are rebuilt. The corrected header is included with the package.Validation and follow-up
The fix rebuilt successfully with NDK 28 for
arm64-v8a,armeabi-v7a,x86andx86_64. A linked star regression on an arm64 Android API 34 emulator reports 2-byte indices, 10 non-degenerate triangles and the expected filled area. Desktop regression retains 4-byte indices.The image above documents the existing failure, not a post-fix rendering result. After the Apothecary PR merges and replacement Android libraries are published, refresh the libraries and rerun the glMatrix/ofPath rendering checks across ES 1.1, 2.0, 3.0 and 3.1.