[gtk/wip.win32.fixes: 146/146] gskglcompiler.c: Relax check for GL 3.x+ legacy contexts

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

commit 79e1cbc7559d8dff3d25a64f35257c28ea3f3e40
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Nov 22 18:41:58 2021 +0800

    gskglcompiler.c: Relax check for GL 3.x+ legacy contexts
    
    On Windows with nVidia drivers at least, when we create a legacy context
    via wglCreateContext(), we may still get a (W)GL 4.x context.  Allow
    such contexts to also use GLSL version 130 instead of 110, so that
    things do continue to work.

 gsk/gl/gskglcompiler.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gsk/gl/gskglcompiler.c b/gsk/gl/gskglcompiler.c
index ca76c60aae..3449dac50d 100644
--- a/gsk/gl/gskglcompiler.c
+++ b/gsk/gl/gskglcompiler.c
@@ -147,7 +147,8 @@ gsk_gl_compiler_new (GskGLDriver *driver,
 
       gdk_gl_context_get_version (context, &maj, &min);
 
-      if (maj == 3)
+      /* On Windows, legacy contexts can give us a GL 4.x context */
+      if (maj >= 3)
         self->glsl_version = SHADER_VERSION_GL3_LEGACY;
       else
         self->glsl_version = SHADER_VERSION_GL2_LEGACY;