[gtk/wip.win32.fixes] gdkglcontext-win32-egl.c: Add a better debug message

[Chun-wei Fan <fanchunwei src gnome org>]

commit dc5e26cc3acbc0a17f84fcb73082dcd8da9516d3
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Oct 7 15:44:38 2021 +0800

    gdkglcontext-win32-egl.c: Add a better debug message
    
    In line with what is done in X11 and Wayland, improve the debug message
    that is output when EGL is being used.

 gdk/win32/gdkglcontext-win32-egl.c | 87 ++++++++++++++++++++++++++++++++++----
 1 file changed, 78 insertions(+), 9 deletions(-)
---
diff --git a/gdk/win32/gdkglcontext-win32-egl.c b/gdk/win32/gdkglcontext-win32-egl.c
index 1507dd8225..2f62e8c45a 100644
--- a/gdk/win32/gdkglcontext-win32-egl.c
+++ b/gdk/win32/gdkglcontext-win32-egl.c
@@ -247,6 +247,65 @@ find_eglconfig_for_window (GdkWin32Display  *display,
   return TRUE;
 }
 
+#ifdef G_ENABLE_DEBUG
+
+static int
+strvcmp (gconstpointer p1,
+         gconstpointer p2)
+{
+  const char * const *s1 = p1;
+  const char * const *s2 = p2;
+
+  return strcmp (*s1, *s2);
+}
+
+static char *
+describe_extensions (EGLDisplay dpy)
+{
+  const char *extensions;
+  char **exts;
+  char *ext;
+
+  extensions = eglQueryString (dpy, EGL_EXTENSIONS);
+
+  exts = g_strsplit (extensions, " ", -1);
+  qsort (exts, g_strv_length (exts), sizeof (char *), strvcmp);
+
+  ext = g_strjoinv ("\n\t", exts);
+  if (ext[0] == '\n')
+    ext[0] = ' ';
+  g_strfreev (exts);
+
+  return g_strstrip (ext);
+}
+
+static char *
+describe_egl_config (EGLDisplay dpy,
+                     EGLConfig  config)
+{
+  EGLint red, green, blue, alpha, type;
+
+  if (!config)
+    return g_strdup ("-");
+
+  if (!eglGetConfigAttrib (dpy, config, EGL_RED_SIZE, &red) ||
+      !eglGetConfigAttrib (dpy, config, EGL_GREEN_SIZE, &green) ||
+      !eglGetConfigAttrib (dpy, config, EGL_BLUE_SIZE, &blue) ||
+      !eglGetConfigAttrib (dpy, config, EGL_ALPHA_SIZE, &alpha))
+    return g_strdup ("Unknown");
+
+  if (epoxy_has_egl_extension (dpy, "EGL_EXT_pixel_format_float"))
+    {
+      if (!eglGetConfigAttrib (dpy, config, EGL_COLOR_COMPONENT_TYPE_EXT, &type))
+        type = EGL_COLOR_COMPONENT_TYPE_FIXED_EXT;
+    }
+  else
+    type = EGL_COLOR_COMPONENT_TYPE_FIXED_EXT;
+
+  return g_strdup_printf ("R%dG%dB%dA%d%s", red, green, blue, alpha, type == 
EGL_COLOR_COMPONENT_TYPE_FIXED_EXT ? "" : " float");
+}
+#endif
+
 gboolean
 gdk_win32_display_init_egl (GdkDisplay  *display,
                             GError     **error)
@@ -284,15 +343,25 @@ gdk_win32_display_init_egl (GdkDisplay  *display,
   display_win32->hasEglSurfacelessContext =
     epoxy_has_egl_extension (egl_disp, "EGL_KHR_surfaceless_context");
 
-  GDK_NOTE (OPENGL,
-            g_print ("EGL API version %d.%d found\n"
-                     " - Vendor: %s\n"
-                     " - Checked extensions:\n"
-                     "\t* EGL_KHR_surfaceless_context: %s\n",
-                     display_win32->egl_version / 10,
-                     display_win32->egl_version % 10,
-                     eglQueryString (display_win32->egl_disp, EGL_VENDOR),
-                     display_win32->hasEglSurfacelessContext ? "yes" : "no"));
+
+  GDK_DISPLAY_NOTE (display, OPENGL, {
+                    char *ext = describe_extensions (display_win32->egl_disp);
+                    char *cfg = describe_egl_config (display_win32->egl_disp,
+                                                     display_win32->egl_config);
+                    g_message ("EGL found\n"
+                               " - Version: %s\n"
+                               " - Vendor: %s\n"
+                               " - Client API: %s\n"
+                               " - Extensions:\n"
+                               "\t%s\n"
+                               " - Config: %s",
+                               eglQueryString (display_win32->egl_disp, EGL_VERSION),
+                               eglQueryString (display_win32->egl_disp, EGL_VENDOR),
+                               eglQueryString (display_win32->egl_disp, EGL_CLIENT_APIS),
+                               ext, cfg);
+                    g_free (ext);
+                    g_free (cfg);
+  });
 
   return find_eglconfig_for_window (display_win32, &display_win32->egl_config,
                                    &display_win32->egl_min_swap_interval, error);