Rewrite host GPU abstraction

- Don't have to repeat the same thing for 4 renderers.
 - Add native Metal renderer.

src/util/gl/context_egl_x11.cpp

@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: 2019-2022 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
+
+#include "context_egl_x11.h"
+
+namespace GL {
+ContextEGLX11::ContextEGLX11(const WindowInfo& wi) : ContextEGL(wi) {}
+ContextEGLX11::~ContextEGLX11() = default;
+
+std::unique_ptr<Context> ContextEGLX11::Create(const WindowInfo& wi, const Version* versions_to_try,
+                                               size_t num_versions_to_try)
+{
+  std::unique_ptr<ContextEGLX11> context = std::make_unique<ContextEGLX11>(wi);
+  if (!context->Initialize(versions_to_try, num_versions_to_try))
+    return nullptr;
+
+  return context;
+}
+
+std::unique_ptr<Context> ContextEGLX11::CreateSharedContext(const WindowInfo& wi)
+{
+  std::unique_ptr<ContextEGLX11> context = std::make_unique<ContextEGLX11>(wi);
+  context->m_display = m_display;
+
+  if (!context->CreateContextAndSurface(m_version, m_context, false))
+    return nullptr;
+
+  return context;
+}
+
+void ContextEGLX11::ResizeSurface(u32 new_surface_width, u32 new_surface_height)
+{
+  ContextEGL::ResizeSurface(new_surface_width, new_surface_height);
+}
+
+EGLNativeWindowType ContextEGLX11::GetNativeWindow(EGLConfig config)
+{
+  return (EGLNativeWindowType)m_wi.window_handle;
+}
+} // namespace GL