Common: Add GL context wrapper implementation

src/common/gl/x11_window.cpp

@@ -0,0 +1,93 @@
+#include "x11_window.h"
+#include "../assert.h"
+#include <cstdio>
+namespace GL {
+X11Window::X11Window() = default;
+
+X11Window::~X11Window()
+{
+  Destroy();
+}
+
+bool X11Window::Create(Display* display, Window parent_window, const XVisualInfo* vi)
+{
+  m_display = display;
+  m_parent_window = parent_window;
+  XSync(m_display, True);
+
+  XWindowAttributes parent_wa = {};
+  XGetWindowAttributes(m_display, m_parent_window, &parent_wa);
+  m_width = static_cast<u32>(parent_wa.width);
+  m_height = static_cast<u32>(parent_wa.height);
+
+  // Failed X calls terminate the process so no need to check for errors.
+  // We could swap the error handler out here as well.
+  m_colormap = XCreateColormap(m_display, m_parent_window, vi->visual, AllocNone);
+
+  XSetWindowAttributes wa = {};
+  wa.colormap = m_colormap;
+
+  m_window = XCreateWindow(m_display, m_parent_window, 0, 0, m_width, m_height, 0, vi->depth, InputOutput, vi->visual,
+                           CWColormap, &wa);
+  XMapWindow(m_display, m_window);
+  XSync(m_display, True);
+
+  return true;
+}
+
+void X11Window::Destroy()
+{
+  if (m_window)
+  {
+    XUnmapWindow(m_display, m_window);
+    XDestroyWindow(m_display, m_window);
+    m_window = {};
+  }
+
+  if (m_colormap)
+  {
+    XFreeColormap(m_display, m_colormap);
+    m_colormap = {};
+  }
+}
+
+void X11Window::Resize(u32 width, u32 height)
+{
+  if (width != 0 && height != 0)
+  {
+    m_width = width;
+    m_height = height;
+  }
+  else
+  {
+    XWindowAttributes parent_wa = {};
+    XGetWindowAttributes(m_display, m_parent_window, &parent_wa);
+    m_width = static_cast<u32>(parent_wa.width);
+    m_height = static_cast<u32>(parent_wa.height);
+  }
+
+  XResizeWindow(m_display, m_window, m_width, m_height);
+}
+
+static X11InhibitErrors* s_current_error_inhibiter;
+
+X11InhibitErrors::X11InhibitErrors()
+{
+  Assert(!s_current_error_inhibiter);
+  m_old_handler = XSetErrorHandler(ErrorHandler);
+  s_current_error_inhibiter = this;
+}
+
+X11InhibitErrors::~X11InhibitErrors()
+{
+  Assert(s_current_error_inhibiter == this);
+  s_current_error_inhibiter = nullptr;
+  XSetErrorHandler(m_old_handler);
+}
+
+int X11InhibitErrors::ErrorHandler(Display* display, XErrorEvent* ee)
+{
+  s_current_error_inhibiter->m_had_error = true;
+  return 0;
+}
+} // namespace GL