Share retained GL runtime dispatch adapters

src/legacy_gl_runtime_dispatch.h

@@ -24,6 +24,21 @@ inline const char* query_opengl_indexed_string(std::uint32_t name, std::uint32_t
         glGetStringi(static_cast<GLenum>(name), static_cast<GLuint>(index)));
 }
 
+inline std::uint32_t query_opengl_error() noexcept
+{
+    return static_cast<std::uint32_t>(glGetError());
+}
+
+inline bool has_opengl_debug_message_callback() noexcept
+{
+    return glDebugMessageCallback != nullptr;
+}
+
+inline void install_opengl_debug_message_callback(GLDEBUGPROC callback, const void* user_param) noexcept
+{
+    glDebugMessageCallback(callback, user_param);
+}
+
 inline pp::renderer::gl::OpenGlRuntimeInfoDispatch runtime_info_dispatch() noexcept
 {
     return pp::renderer::gl::OpenGlRuntimeInfoDispatch {