Epoxy-emscripoten is a library for handling OpenGL function pointer management for you. It simplified to only support GLES2/3 and EGL for use with Emscripten.

Features

• Automatically initializes as new GL functions are used.
• GLES 1/2/3 context support.
• Knows about function aliases so (e.g.) glBufferData() can be used with GL_ARB_vertex_buffer_object implementations, along with GL 1.5+ implementations.
• EGL support.
• Can be mixed with non-epoxy GL usage.

Building

mkdir _build && cd _build
meson
ninja
sudo ninja install

Dependencies for Debian:

• meson
• libegl1-mesa-dev

Dependencies for macOS (using MacPorts):

• pkgconfig
• meson

The test suite has additional dependencies depending on the platform. (EGL, a running X Server).

Switching your code to using epoxy

It should be as easy as replacing:

#include <GL/gl.h>
#include <GL/glext.h>

with:

#include <epoxy/gl.h>

As long as epoxy's headers appear first, you should be ready to go. Additionally, some new helpers become available, so you don't have to write them:

int epoxy_gl_version() returns the GL version:

• 12 for GL 1.2
• 20 for GL 2.0
• 44 for GL 4.4

bool epoxy_has_gl_extension() returns whether a GL extension is available (GL_ARB_texture_buffer_object, for example).

Note that this is not terribly fast, so keep it out of your hot paths, ok?