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Enable OpenGL GAL and 3D viewer stubs for WASM

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Changes:
- Add glu_wasm_impl.cpp: GLU tesselator using KiCad's earcut triangulation
- Add GL/glu.h: GLU header for WASM builds
- Add 3D viewer stubs for KICAD_BUILD_3D_VIEWER_WASM=ON
- Remove obsolete gl_canvas_stub.cpp (OpenGL now uses real impl)
- Remove obsolete glu_stub.c (replaced by glu_wasm_impl.cpp)
- Update build-pcbnew.sh comment about GLU implementation

The OpenGL GAL now works in WASM using WebGL with LEGACY_GL_EMULATION.
3D viewer is stubbed out but builds successfully.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Viktor Vaczi 2026-01-03 08:19:40 +01:00
commit cb58b43bd1
9 changed files with 945 additions and 558 deletions
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7
scripts/kicad/build-pcbnew.sh
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@ -164,9 +164,8 @@ emar rcs "${STUBS_BUILD}/libgit2_stub.a" "${STUBS_BUILD}/libgit2_stub.o"
emcc -c "${STUBS_DIR}/curl_stub.c" -o "${STUBS_BUILD}/curl_stub.o"
emar rcs "${STUBS_BUILD}/libcurl_stub.a" "${STUBS_BUILD}/curl_stub.o"
# Compile GLU stub (for 3D viewer)
emcc -c "${STUBS_DIR}/glu_stub.c" -o "${STUBS_BUILD}/glu_stub.o"
emar rcs "${STUBS_BUILD}/libglu_stub.a" "${STUBS_BUILD}/glu_stub.o"
# Note: GLU tesselator is now implemented in wasm/stubs/glu_wasm_impl.cpp
# It's compiled as part of the GAL library (requires KiCad headers)
# Compile PCBnew scripting stub (requires wxWidgets headers)
WX_CXXFLAGS=$("${WX_BUILD}/wx-config" --cxxflags 2>/dev/null || echo "-I${WX_BUILD}/lib/wx/include/emscripten-unicode-static-3.2 -I${PROJECT_ROOT}/wxwidgets/include")
@ -240,7 +239,7 @@ emcmake cmake "${KICAD_DIR}" \
-DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
-DCMAKE_CXX_FLAGS="${EXTRA_FLAGS} -pthread -sUSE_ZLIB=1 -DKICAD_USE_PLATFORM_WASM=1 -I${SYSROOT}/include -I${STUBS_DIR}" \
-DCMAKE_C_FLAGS="${EXTRA_FLAGS} -pthread -sUSE_ZLIB=1 -I${SYSROOT}/include -I${STUBS_DIR}" \
-DCMAKE_EXE_LINKER_FLAGS="${LINKER_DEBUG_FLAGS} -pthread -sUSE_ZLIB=1 -sASYNCIFY=1 -sDYNCALLS=1 -sASYNCIFY_STACK_SIZE=65536 -sUSE_PTHREADS=1 -sPTHREAD_POOL_SIZE='navigator.hardwareConcurrency' -sPTHREAD_POOL_SIZE_STRICT=0 -sALLOW_MEMORY_GROWTH=1 -sINITIAL_MEMORY=256MB -sMAXIMUM_MEMORY=4GB -sEXPORTED_RUNTIME_METHODS=['ccall','cwrap','UTF8ToString','stringToUTF8','lengthBytesUTF8','dynCall'] -sDEFAULT_LIBRARY_FUNCS_TO_INCLUDE=['\$dynCall'] --bind -L${SYSROOT}/lib ${STUBS_BUILD}/libgit2_stub.a ${STUBS_BUILD}/libcurl_stub.a ${STUBS_BUILD}/libglu_stub.a ${STUBS_BUILD}/libpcbnew_scripting_stub.a ${STUBS_BUILD}/libnng_stub.a ${STUBS_BUILD}/pcbnew_embind.o" \
-DCMAKE_EXE_LINKER_FLAGS="${LINKER_DEBUG_FLAGS} -pthread -sUSE_ZLIB=1 -sASYNCIFY=1 -sDYNCALLS=1 -sASYNCIFY_STACK_SIZE=65536 -sUSE_PTHREADS=1 -sPTHREAD_POOL_SIZE='navigator.hardwareConcurrency' -sPTHREAD_POOL_SIZE_STRICT=0 -sALLOW_MEMORY_GROWTH=1 -sINITIAL_MEMORY=256MB -sMAXIMUM_MEMORY=4GB -sLEGACY_GL_EMULATION -sMAX_WEBGL_VERSION=2 -sEXPORTED_RUNTIME_METHODS=['ccall','cwrap','UTF8ToString','stringToUTF8','lengthBytesUTF8','dynCall'] -sDEFAULT_LIBRARY_FUNCS_TO_INCLUDE=['\$dynCall'] --bind -L${SYSROOT}/lib ${STUBS_BUILD}/libgit2_stub.a ${STUBS_BUILD}/libcurl_stub.a ${STUBS_BUILD}/libpcbnew_scripting_stub.a ${STUBS_BUILD}/libnng_stub.a ${STUBS_BUILD}/pcbnew_embind.o" \
-DCMAKE_PREFIX_PATH="${SYSROOT};${WX_BUILD}" \
-DwxWidgets_CONFIG_EXECUTABLE="${WX_BUILD}/wx-config" \
\