For context, on line 38, it checks for #if defined(BACKEND_OPENGL_VERSION_GL) to determine if we're dealing with OpenGL or GLES. However, BACKEND_OPENGL_VERSION_GL is only defined in gl_headers.h. Without including this header, this define is never set and, therefore, this class will always assume it's only for GLES.

Originally posted by @haroonq in #9724 (comment)