OpenVG_Library

OpenVG 1.1 for McNopper/EGL: a software OpenVG implementation (the vg* API) whose platform side is played by McNopper/EGL through a thin provider glue.

The implementation derives from the OpenVG 1.1 Reference Implementation by The Khronos Group (https://www.khronos.org/openvg/). Its functionality is preserved; outdated or buggy code is fixed - for example the 32-bit handle typedef (it did not build for x64) and an MSVC6-era for macro that broke modern toolchains. Provenance and license are documented in THIRD-PARTY.md.

Use it on platforms that do not provide their own EGL/OpenVG pair - desktop Windows and Linux. On platforms that do provide both (for example embedded GPUs such as the Vivante GPU of the STM32MP1), link the platform's own libraries instead and leave this library out - that is what the McNopper/OpenVG examples do.

Building

    cmake -S . -B build
    cmake --build build

This produces the OpenVG static library. Requirements:

• McNopper/EGL - its OpenVG seam (EGL_ENABLE_OPENVG) is switched on by this library's build. A sibling ../EGL checkout is preferred; otherwise the v1.0.17 release is fetched.
• A C++14 compiler (the reference implementation is MSVC6-era C++).

Usage

Link the OpenVG target (it pulls in EGL) and include <VG/openvg.h>:

    target_link_libraries(my_app OpenVG)

The provider registers itself with EGL at startup, so there is no initialization code to write. EGL hands the implementation a VG_sARGB_8888 framebuffer (see EGL's src/eglvg.h) and presents it on eglSwapBuffers.

Together with GLUS (OpenGL=VG flavor) this is the full stack behind the McNopper/OpenVG examples.

License

The glue and build environment are MIT (see LICENSE). The RI-derived sources are (c) 2007 The Khronos Group under their own permissive license - see THIRD-PARTY.md and RI/license.txt, and https://www.khronos.org/openvg/.

Code quality

Layer	Command	Gate
cppcheck	cmake --build build/ninja --target cppcheck	exits non-zero on findings
clang-tidy	python tools/check_tidy.py --build-dir build/ninja	WarningsAsErrors in .clang-tidy

The vendored Khronos RI under RI/ is third-party scope: it carries its own RI/.clang-tidy recording the boundary - the bring-up findings stay recorded, not repaired (see the comment there and THIRD-PARTY.md) - and the cppcheck target excludes it in cmake/cppcheck.cmake. The gates are optional at build time; a clean checkout without them builds exactly as before. The clang-tidy profile keeps correctness classes and deliberately skips style - formatting here is authored, not derived.