[gtk/wip.win32.fixes: 16/23] glcontext: Simplify get_required_version api

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

commit 5921a0d64086653a0bb34d3e3b3d1a4a5054d2aa
Author: Pablo Correa Gómez <ablocorrea hotmail com>
Date:   Mon May 30 20:18:15 2022 +0200

    glcontext: Simplify get_required_version api
    
    Simplify the API to just return the requirements that the user
    has asked for. The rest of the code was undocumented and previously
    used as a buggy source for a default value from internal code.
    Since the buggy code is now fixed, remove all unnecessary cruft.

 gdk/gdkglcontext.c | 48 +++++++++---------------------------------------
 1 file changed, 9 insertions(+), 39 deletions(-)
---
diff --git a/gdk/gdkglcontext.c b/gdk/gdkglcontext.c
index 17db00e8b3..97a8776c96 100644
--- a/gdk/gdkglcontext.c
+++ b/gdk/gdkglcontext.c
@@ -1081,7 +1081,10 @@ gdk_gl_context_check_version (GdkGLContext *self,
  * @major: (out) (nullable): return location for the major version to request
  * @minor: (out) (nullable): return location for the minor version to request
  *
- * Retrieves required OpenGL version.
+ * Retrieves required OpenGL version set as a requirement for the @context
+ * realization. It will not change even if a greater OpenGL version is supported
+ * and used after the @context is realized. See
+ * [method@Gdk.GLContext.get_version] for the real version in use.
  *
  * See [method@Gdk.GLContext.set_required_version].
  */
@@ -1091,47 +1094,14 @@ gdk_gl_context_get_required_version (GdkGLContext *context,
                                      int          *minor)
 {
   GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
-  gboolean force_gles = FALSE;
-  GdkDisplay *display;
-  int default_major, default_minor;
-  int maj, min;
 
   g_return_if_fail (GDK_IS_GL_CONTEXT (context));
 
-  display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
-
-#ifdef G_ENABLE_DEBUG
-  force_gles = GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES);
-#endif
-
-  /* libANGLE on Windows at least requires GLES 3.0+ */
-  if (display->have_egl_win32_libangle)
-    force_gles = TRUE;
-
-  /* Default fallback values for uninitialised contexts; we
-   * enforce a context version number of 3.2 for desktop GL,
-   * and 2.0 for GLES
-   */
-  if (gdk_gl_context_get_use_es (context) || force_gles)
-    {
-      default_major = display->have_egl_win32_libangle ? 3 : 2;
-      default_minor = 0;
-    }
-  else
-    {
-      default_major = 3;
-      default_minor = 2;
-    }
-
-  if (priv->major > 0)
-    maj = priv->major;
-  else
-    maj = default_major;
-
-  if (priv->minor > 0)
-    min = priv->minor;
-  else
-    min = default_minor;
+  if (major != NULL)
+    *major = priv->major;
+  if (minor != NULL)
+    *minor = priv->minor;
+}
 
 void
 gdk_gl_context_get_clipped_version (GdkGLContext *context,