[gtk+] mir, gl: Ensure we use the 3.2 core profile

[Marco Trevisan <marcotrevi src gnome org>]

commit c82ad2c1292b1e39f41db20467e5b3691cbb6984
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Thu Feb 12 03:34:05 2015 +0100

    mir, gl: Ensure we use the 3.2 core profile
    
    Emit an error if the profile is different.

 gdk/mir/gdkmirglcontext.c |   44 ++++++++++++++++++++++++++++++++++++++------
 1 files changed, 38 insertions(+), 6 deletions(-)
---
diff --git a/gdk/mir/gdkmirglcontext.c b/gdk/mir/gdkmirglcontext.c
index 5cacdb5..b5b23c6 100644
--- a/gdk/mir/gdkmirglcontext.c
+++ b/gdk/mir/gdkmirglcontext.c
@@ -26,6 +26,8 @@
 
 G_DEFINE_TYPE (GdkMirGLContext, gdk_mir_gl_context, GDK_TYPE_GL_CONTEXT)
 
+#define N_EGL_ATTRS 16
+
 static gboolean
 gdk_mir_gl_context_realize (GdkGLContext *context,
                             GError      **error)
@@ -35,8 +37,10 @@ gdk_mir_gl_context_realize (GdkGLContext *context,
   GdkGLContext *share = gdk_gl_context_get_shared_context (context);
   GdkGLProfile profile = gdk_gl_context_get_profile (context);
   EGLContext ctx;
-  EGLint context_attribs[3];
-  int i;
+  EGLint context_attribs[N_EGL_ATTRS];
+  int major, minor, flags;
+  gboolean debug_bit, forward_bit;
+  int i = 0;
 
   if (!_gdk_mir_display_init_egl_display (display))
     {
@@ -46,13 +50,41 @@ gdk_mir_gl_context_realize (GdkGLContext *context,
       return FALSE;
     }
 
-  i = 0;
-  if (profile == GDK_GL_PROFILE_3_2_CORE)
+  if (profile != GDK_GL_PROFILE_3_2_CORE)
     {
-      context_attribs[i++] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
-      context_attribs[i++] = EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_UNSUPPORTED_PROFILE,
+                           _("Unsupported profile for a GL context"));
+      return FALSE;
     }
+
+  gdk_gl_context_get_required_version (context, &major, &minor);
+  debug_bit = gdk_gl_context_get_debug_enabled (context);
+  forward_bit = gdk_gl_context_get_forward_compatible (context);
+
+  flags = 0;
+
+  if (debug_bit)
+    flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
+  if (forward_bit)
+    flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
+
+  /* We want a core profile */
+  context_attribs[i++] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
+  context_attribs[i++] = EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
+
+  /* Specify the version */
+  context_attribs[i++] = EGL_CONTEXT_MAJOR_VERSION_KHR;
+  context_attribs[i++] = major;
+  context_attribs[i++] = EGL_CONTEXT_MINOR_VERSION_KHR;
+  context_attribs[i++] = minor;
+
+  /* Specify the flags */
+  context_attribs[i++] = EGL_CONTEXT_FLAGS_KHR;
+  context_attribs[i++] = flags;
+
   context_attribs[i++] = EGL_NONE;
+  g_assert (i < N_EGL_ATTRS);
 
   ctx = eglCreateContext (_gdk_mir_display_get_egl_display (display),
                           context_mir->egl_config,