citadel/meta-gnome/recipes-support/gtk+/gtk+3/opengl.patch

From 4a0716f04fb25b51b08e994bd5a900b2e7f7fed5 Mon Sep 17 00:00:00 2001
From: Jussi Kukkonen <jussi.kukkonen@intel.com>
Date: Fri, 16 Oct 2015 16:35:16 +0300
Subject: [PATCH] Do not try to initialize GL without libGL

_gdk_x11_screen_update_visuals_for_gl() will end up calling epoxys
GLX api which will exit() if libGL.so.1 is not present. We do not
want that to happen and we don't want every app to have to set
"GDK_GL=disabled" environment variable: so use #ifdef set based on
opengl distro feature.

Upstream is not interested in the fix as it is: Either epoxy should be
fixed (to not exit) or GTK+ possibly could do some additional probing
before calling epoxy APIs.

Upstream-Status: Denied
Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
---
 demos/gtk-demo/meson.build       |  5 ++++-
 docs/tools/meson.build           |  7 +++++--
 docs/tools/widgets.c             |  6 +++++-
 gdk/gdkconfig.h.meson            |  1 +
 gdk/gdkdisplay.c                 |  4 ++++
 gdk/gdkgl.c                      | 10 ++++++++++
 gdk/gdkglcontext.c               |  6 ++++++
 gdk/gdkwindow.c                  | 13 +++++++++++++
 gdk/meson.build                  |  8 +++++++-
 gdk/x11/gdkdisplay-x11.c         |  6 +++++-
 gdk/x11/gdkvisual-x11.c          |  5 +++++
 gdk/x11/gdkwindow-x11.c          |  4 ++++
 gdk/x11/gdkx-autocleanups.h      |  2 ++
 gdk/x11/gdkx.h                   |  2 ++
 gdk/x11/meson.build              |  7 +++++--
 gtk/gtkglarea.c                  | 19 +++++++++++++++++++
 gtk/inspector/general.c          |  6 ++++++
 meson.build                      | 17 ++++++++++++++---
 meson_options.txt                |  2 ++
 tests/meson.build                |  9 +++++++--
 testsuite/gtk/objects-finalize.c |  2 ++
 21 files changed, 128 insertions(+), 13 deletions(-)

diff --git a/demos/gtk-demo/meson.build b/demos/gtk-demo/meson.build
index 252da16d05..4b57cff6ac 100644
--- a/demos/gtk-demo/meson.build
+++ b/demos/gtk-demo/meson.build
@@ -28,7 +28,6 @@ demos = files([
   'fishbowl.c',
   'foreigndrawing.c',
   'gestures.c',
-  'glarea.c',
   'headerbar.c',
   'hypertext.c',
   'iconview.c',
@@ -87,6 +86,10 @@ elif harfbuzz_dep.found() and pangoft_dep.found()
   gtkdemo_deps += [harfbuzz_dep, pangoft_dep]
 endif
 
+if opengl_enabled
+  demos += files('glarea.c')
+endif
+
 if os_unix
   demos += files('pagesetup.c')
 endif
diff --git a/docs/tools/meson.build b/docs/tools/meson.build
index 05621ee7ed..3d0a333b32 100644
--- a/docs/tools/meson.build
+++ b/docs/tools/meson.build
@@ -2,10 +2,13 @@ if x11_enabled
   doc_shooter_sources = [
     'shadow.c',
     'shooter.c',
-    'widgets.c',
-    '../../tests/gtkgears.c',
+    'widgets.c'
   ]
 
+  if opengl_enabled
+  doc_shooter_sources += ['../../tests/gtkgears.c']
+  endif
+
   doc_shooter = executable('doc-shooter', doc_shooter_sources,
                            include_directories: [ confinc, gdkinc, gtkinc, testinc, ],
                            dependencies: libgtk_dep)
diff --git a/docs/tools/widgets.c b/docs/tools/widgets.c
index 932daf1746..348807e133 100644
--- a/docs/tools/widgets.c
+++ b/docs/tools/widgets.c
@@ -8,7 +8,9 @@
 #include <X11/Xatom.h>
 #include <gdkx.h>
 #include "widgets.h"
+#ifdef HAVE_OPENGL
 #include "gtkgears.h"
+#endif
 
 #define SMALL_WIDTH  240
 #define SMALL_HEIGHT 75
@@ -1526,9 +1528,11 @@ create_gl_area (void)
   widget = gtk_frame_new (NULL);
   gtk_frame_set_shadow_type (GTK_FRAME (widget), GTK_SHADOW_IN);
 
+#ifdef HAVE_OPENGL
   gears = gtk_gears_new ();
   gtk_container_add (GTK_CONTAINER (widget), gears);
- 
+#endif
+
   info = new_widget_info ("glarea", widget, MEDIUM);
 
   return info;
diff --git a/gdk/gdkconfig.h.meson b/gdk/gdkconfig.h.meson
index 7db19e0470..088651bafa 100644
--- a/gdk/gdkconfig.h.meson
+++ b/gdk/gdkconfig.h.meson
@@ -15,6 +15,7 @@ G_BEGIN_DECLS
 #mesondefine GDK_WINDOWING_WAYLAND
 #mesondefine GDK_WINDOWING_WIN32
 #mesondefine GDK_WINDOWING_QUARTZ
+#mesondefine GDK_WITH_OPENGL
 
 G_END_DECLS
 
diff --git a/gdk/gdkdisplay.c b/gdk/gdkdisplay.c
index 748f54860c..04ef2c09d4 100644
--- a/gdk/gdkdisplay.c
+++ b/gdk/gdkdisplay.c
@@ -2420,7 +2420,11 @@ gboolean
 gdk_display_make_gl_context_current (GdkDisplay   *display,
                                      GdkGLContext *context)
 {
+#ifdef HAVE_OPENGL
   return GDK_DISPLAY_GET_CLASS (display)->make_gl_context_current (display, context);
+#else
+  return FALSE;
+#endif
 }
 
 GdkRenderingMode
diff --git a/gdk/gdkgl.c b/gdk/gdkgl.c
index 9690077cc2..55f85ef605 100644
--- a/gdk/gdkgl.c
+++ b/gdk/gdkgl.c
@@ -26,7 +26,9 @@
 # include "win32/gdkwin32.h"
 #endif
 
+#ifdef HAVE_OPENGL
 #include <epoxy/gl.h>
+#endif
 #include <math.h>
 #include <string.h>
 
@@ -40,6 +42,7 @@ gdk_cairo_surface_mark_as_direct (cairo_surface_t *surface,
                                g_object_ref (window),  g_object_unref);
 }
 
+#ifdef HAVE_OPENGL
 static const char *
 get_vertex_type_name (int type)
 {
@@ -212,6 +215,7 @@ use_texture_rect_program (GdkGLContextPaintData *paint_data)
       glUseProgram (paint_data->current_program->program);
     }
 }
+#endif
 
 void
 gdk_gl_texture_quads (GdkGLContext *paint_context,
@@ -220,6 +224,7 @@ gdk_gl_texture_quads (GdkGLContext *paint_context,
                       GdkTexturedQuad *quads,
                       gboolean flip_colors)
 {
+#ifdef HAVE_OPENGL
   GdkGLContextPaintData *paint_data  = gdk_gl_context_get_paint_data (paint_context);
   GdkGLContextProgram *program;
   GdkWindow *window = gdk_gl_context_get_window (paint_context);
@@ -293,6 +298,7 @@ gdk_gl_texture_quads (GdkGLContext *paint_context,
 
   glDisableVertexAttribArray (program->position_location);
   glDisableVertexAttribArray (program->uv_location);
+#endif
 }
 
 /* x,y,width,height describes a rectangle in the gl render buffer
@@ -341,6 +347,7 @@ gdk_cairo_draw_from_gl (cairo_t              *cr,
                         int                   width,
                         int                   height)
 {
+#ifdef HAVE_OPENGL
   GdkGLContext *paint_context;
   cairo_surface_t *image;
   cairo_matrix_t matrix;
@@ -718,6 +725,7 @@ out:
   if (clip_region)
     cairo_region_destroy (clip_region);
 
+#endif
 }
 
 /* This is always called with the paint context current */
@@ -725,6 +733,7 @@ void
 gdk_gl_texture_from_surface (cairo_surface_t *surface,
 			     cairo_region_t  *region)
 {
+#ifdef HAVE_OPENGL
   GdkGLContext *paint_context;
   cairo_surface_t *image;
   double device_x_offset, device_y_offset;
@@ -825,4 +834,5 @@ gdk_gl_texture_from_surface (cairo_surface_t *surface,
 
   glDisable (GL_SCISSOR_TEST);
   glDeleteTextures (1, &texture_id);
+#endif
 }
diff --git a/gdk/gdkglcontext.c b/gdk/gdkglcontext.c
index 3b23639e1c..1f04f8e0b2 100644
--- a/gdk/gdkglcontext.c
+++ b/gdk/gdkglcontext.c
@@ -85,7 +85,9 @@
 #include "gdkintl.h"
 #include "gdk-private.h"
 
+#ifdef HAVE_OPENGL
 #include <epoxy/gl.h>
+#endif
 
 typedef struct {
   GdkDisplay *display;
@@ -243,6 +245,7 @@ gdk_gl_context_upload_texture (GdkGLContext    *context,
                                int              height,
                                guint            texture_target)
 {
+#ifdef HAVE_OPENGL
   GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
 
   g_return_if_fail (GDK_IS_GL_CONTEXT (context));
@@ -286,6 +289,7 @@ gdk_gl_context_upload_texture (GdkGLContext    *context,
             glTexSubImage2D (texture_target, 0, 0, i, width, 1, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, (unsigned char*) data + (i * stride));
         }
     }
+#endif
 }
 
 static gboolean
@@ -774,6 +778,7 @@ gdk_gl_context_realize (GdkGLContext  *context,
 static void
 gdk_gl_context_check_extensions (GdkGLContext *context)
 {
+#ifdef HAVE_OPENGL
   GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
   gboolean has_npot, has_texture_rectangle;
 
@@ -853,6 +858,7 @@ gdk_gl_context_check_extensions (GdkGLContext *context)
                        priv->use_texture_rectangle ? "yes" : "no"));
 
   priv->extensions_checked = TRUE;
+#endif
 }
 
 /**
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 727b0cf1f4..d4d91b0d16 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -45,7 +45,9 @@
 
 #include <math.h>
 
+#ifdef HAVE_OPENGL
 #include <epoxy/gl.h>
+#endif
 
 /* for the use of round() */
 #include "fallback-c89.c"
@@ -2844,6 +2846,13 @@ gdk_window_get_paint_gl_context (GdkWindow  *window,
 {
   GError *internal_error = NULL;
 
+#ifndef HAVE_OPENGL
+  g_set_error_literal (error, GDK_GL_ERROR,
+                       GDK_GL_ERROR_NOT_AVAILABLE,
+                       _("GL support disabled with --disable-opengl"));
+  return NULL;
+#endif
+
   if (_gdk_gl_flags & GDK_GL_DISABLE)
     {
       g_set_error_literal (error, GDK_GL_ERROR,
@@ -2979,6 +2988,7 @@ gdk_window_begin_paint_internal (GdkWindow            *window,
         }
       else
         {
+#ifdef HAVE_OPENGL
 	  gdk_gl_context_make_current (context);
           /* With gl we always need a surface to combine the gl
              drawing with the native drawing. */
@@ -2993,6 +3003,7 @@ gdk_window_begin_paint_internal (GdkWindow            *window,
           glBlendFunc (GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 
           glViewport (0, 0, ww, wh);
+#endif
         }
     }
 
@@ -3056,6 +3067,7 @@ gdk_window_end_paint_internal (GdkWindow *window)
 
           gdk_gl_context_make_current (window->gl_paint_context);
 
+#ifdef HAVE_OPENGL
           if (!cairo_region_is_empty (opaque_region))
             gdk_gl_texture_from_surface (window->current_paint.surface,
                                          opaque_region);
@@ -3066,6 +3078,7 @@ gdk_window_end_paint_internal (GdkWindow *window)
                                            window->current_paint.need_blend_region);
               glDisable(GL_BLEND);
             }
+#endif
 
           cairo_region_destroy (opaque_region);
 
diff --git a/gdk/meson.build b/gdk/meson.build
index 4bb1bf2b6c..64172b8d3e 100644
--- a/gdk/meson.build
+++ b/gdk/meson.build
@@ -56,7 +56,6 @@ gdk_gir_public_headers = files(
   'gdkdrawingcontext.h',
   'gdkevents.h',
   'gdkframetimings.h',
-  'gdkglcontext.h',
   'gdkkeys.h',
   'gdkkeysyms.h',
   'gdkmain.h',
@@ -78,6 +77,12 @@ gdk_gir_public_headers = files(
   'gdkwindow.h',
 )
 gdk_nogir_public_headers = [files('gdkkeysyms-compat.h')]
+if opengl_enabled
+gdk_gir_public_headers += files('gdkglcontext.h')
+else
+gdk_nogir_public_headers += files('gdkglcontext.h')
+endif
+
 gdk_public_headers = gdk_gir_public_headers + gdk_nogir_public_headers
 install_headers(gdk_public_headers, subdir : 'gtk-3.0/gdk')
 
@@ -166,6 +171,7 @@ gdkconfig_cdata.set('GDK_WINDOWING_WAYLAND', wayland_enabled)
 gdkconfig_cdata.set('GDK_WINDOWING_WIN32', win32_enabled)
 gdkconfig_cdata.set('GDK_WINDOWING_BROADWAY', broadway_enabled)
 gdkconfig_cdata.set('GDK_WINDOWING_QUARTZ', quartz_enabled)
+gdkconfig_cdata.set('GDK_WITH_OPENGL', opengl_enabled)
 
 gdkconfig = configure_file(
   input  : 'gdkconfig.h.meson',
diff --git a/gdk/x11/gdkdisplay-x11.c b/gdk/x11/gdkdisplay-x11.c
index 7e08f472cc..30fd7b6089 100644
--- a/gdk/x11/gdkdisplay-x11.c
+++ b/gdk/x11/gdkdisplay-x11.c
@@ -37,7 +37,9 @@
 #include "gdkdisplay-x11.h"
 #include "gdkprivate-x11.h"
 #include "gdkscreen-x11.h"
+#ifdef HAVE_OPENGL
 #include "gdkglcontext-x11.h"
+#endif
 #include "gdk-private.h"
 #include "gdkprofilerprivate.h"
 
@@ -3191,7 +3193,9 @@ gdk_x11_display_class_init (GdkX11DisplayClass * class)
   display_class->text_property_to_utf8_list = _gdk_x11_display_text_property_to_utf8_list;
   display_class->utf8_to_string_target = _gdk_x11_display_utf8_to_string_target;
 
-  display_class->make_gl_context_current = gdk_x11_display_make_gl_context_current;
+#ifdef HAVE_OPENGL
+   display_class->make_gl_context_current = gdk_x11_display_make_gl_context_current;
+#endif
 
   display_class->get_default_seat = gdk_x11_display_get_default_seat;
 
diff --git a/gdk/x11/gdkvisual-x11.c b/gdk/x11/gdkvisual-x11.c
index 81479d81f4..3c8c5c02ff 100644
--- a/gdk/x11/gdkvisual-x11.c
+++ b/gdk/x11/gdkvisual-x11.c
@@ -306,7 +306,12 @@ _gdk_x11_screen_init_visuals (GdkScreen *screen)
   /* If GL is available we want to pick better default/rgba visuals,
      as we care about glx details such as alpha/depth/stencil depth,
      stereo and double buffering */
+  /* update_visuals_for_gl() will end up calling epoxy GLX api which
+     will exit if libgl is not there: so only do this if we know GL
+     is available */
+#ifdef HAVE_GLX
   _gdk_x11_screen_update_visuals_for_gl (screen);
+#endif
 }
 
 gint
diff --git a/gdk/x11/gdkwindow-x11.c b/gdk/x11/gdkwindow-x11.c
index 194bc82e29..0302bb68d4 100644
--- a/gdk/x11/gdkwindow-x11.c
+++ b/gdk/x11/gdkwindow-x11.c
@@ -36,7 +36,9 @@
 #include "gdkasync.h"
 #include "gdkeventsource.h"
 #include "gdkdisplay-x11.h"
+#ifdef HAVE_OPENGL
 #include "gdkglcontext-x11.h"
+#endif
 #include "gdkprivate-x11.h"
 #include "gdk-private.h"
 
@@ -5888,7 +5890,9 @@ gdk_window_impl_x11_class_init (GdkWindowImplX11Class *klass)
   impl_class->set_opaque_region = gdk_x11_window_set_opaque_region;
   impl_class->set_shadow_width = gdk_x11_window_set_shadow_width;
   impl_class->show_window_menu = gdk_x11_window_show_window_menu;
+#ifdef HAVE_OPENGL
   impl_class->create_gl_context = gdk_x11_window_create_gl_context;
   impl_class->invalidate_for_new_frame = gdk_x11_window_invalidate_for_new_frame;
+#endif
   impl_class->get_unscaled_size = gdk_x11_window_get_unscaled_size;
 }
diff --git a/gdk/x11/gdkx-autocleanups.h b/gdk/x11/gdkx-autocleanups.h
index edb0ea7dbf..a317d61cca 100644
--- a/gdk/x11/gdkx-autocleanups.h
+++ b/gdk/x11/gdkx-autocleanups.h
@@ -30,7 +30,9 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkX11DeviceXI2, g_object_unref)
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkX11Display, g_object_unref)
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkX11DisplayManager, g_object_unref)
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkX11DragContext, g_object_unref)
+#ifdef HAVE_OPENGL
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkX11GLContext, g_object_unref)
+#endif
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkX11Keymap, g_object_unref)
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkX11Screen, g_object_unref)
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkX11Visual, g_object_unref)
diff --git a/gdk/x11/gdkx.h b/gdk/x11/gdkx.h
index 1f64bccb6d..4db6c18351 100644
--- a/gdk/x11/gdkx.h
+++ b/gdk/x11/gdkx.h
@@ -43,7 +43,9 @@
 #include <gdk/x11/gdkx11display.h>
 #include <gdk/x11/gdkx11displaymanager.h>
 #include <gdk/x11/gdkx11dnd.h>
+#ifdef GDK_WITH_OPENGL
 #include <gdk/x11/gdkx11glcontext.h>
+#endif
 #include <gdk/x11/gdkx11keys.h>
 #include <gdk/x11/gdkx11monitor.h>
 #include <gdk/x11/gdkx11property.h>
diff --git a/gdk/x11/meson.build b/gdk/x11/meson.build
index 754ae0a615..0318c83877 100644
--- a/gdk/x11/meson.build
+++ b/gdk/x11/meson.build
@@ -14,7 +14,6 @@ gdk_x11_sources = files(
   'gdkeventsource.c',
   'gdkeventtranslator.c',
   'gdkgeometry-x11.c',
-  'gdkglcontext-x11.c',
   'gdkkeys-x11.c',
   'gdkmain-x11.c',
   'gdkproperty-x11.c',
@@ -42,7 +41,6 @@ gdk_x11_public_headers = files(
   'gdkx11display.h',
   'gdkx11displaymanager.h',
   'gdkx11dnd.h',
-  'gdkx11glcontext.h',
   'gdkx11keys.h',
   'gdkx11monitor.h',
   'gdkx11property.h',
@@ -53,6 +51,11 @@ gdk_x11_public_headers = files(
   'gdkx11window.h',
 )
 
+if opengl_enabled
+  gdk_x11_sources += files('gdkglcontext-x11.c')
+  gdk_x11_public_headers += files('gdkx11glcontext.h')
+endif
+
 install_headers(gdk_x11_public_headers, subdir: 'gtk-3.0/gdk/x11/')
 install_headers('gdkx.h', subdir: 'gtk-3.0/gdk/')
 
diff --git a/gtk/gtkglarea.c b/gtk/gtkglarea.c
index 802303ea9f..6439d7745d 100644
--- a/gtk/gtkglarea.c
+++ b/gtk/gtkglarea.c
@@ -29,7 +29,9 @@
 #include "gtkprivate.h"
 #include "gtkrender.h"
 
+#ifdef HAVE_OPENGL
 #include <epoxy/gl.h>
+#endif
 
 /**
  * SECTION:gtkglarea
@@ -369,9 +371,12 @@ gtk_gl_area_real_create_context (GtkGLArea *area)
 static void
 gtk_gl_area_resize (GtkGLArea *area, int width, int height)
 {
+#ifdef HAVE_OPENGL
   glViewport (0, 0, width, height);
+#endif
 }
 
+#ifdef HAVE_OPENGL
 /*
  * Creates all the buffer objects needed for rendering the scene
  */
@@ -483,6 +488,7 @@ gtk_gl_area_allocate_buffers (GtkGLArea *area)
 
   priv->needs_render = TRUE;
 }
+#endif
 
 /**
  * gtk_gl_area_attach_buffers:
@@ -501,6 +507,7 @@ gtk_gl_area_allocate_buffers (GtkGLArea *area)
 void
 gtk_gl_area_attach_buffers (GtkGLArea *area)
 {
+#ifdef HAVE_OPENGL
   GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
 
   g_return_if_fail (GTK_IS_GL_AREA (area));
@@ -533,11 +540,13 @@ gtk_gl_area_attach_buffers (GtkGLArea *area)
         glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
                                    GL_RENDERBUFFER, priv->depth_stencil_buffer);
     }
+#endif
 }
 
 static void
 gtk_gl_area_delete_buffers (GtkGLArea *area)
 {
+#ifdef HAVE_OPENGL
   GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
 
   if (priv->context == NULL)
@@ -569,6 +578,7 @@ gtk_gl_area_delete_buffers (GtkGLArea *area)
       glDeleteFramebuffers (1, &priv->frame_buffer);
       priv->frame_buffer = 0;
     }
+#endif
 }
 
 static void
@@ -679,6 +689,7 @@ gtk_gl_area_draw (GtkWidget *widget,
   GtkGLArea *area = GTK_GL_AREA (widget);
   GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
   gboolean unused;
+#ifdef HAVE_OPENGL
   int w, h, scale;
   GLenum status;
 
@@ -736,6 +747,14 @@ gtk_gl_area_draw (GtkWidget *widget,
     }
 
   return TRUE;
+#else
+  if (priv->error != NULL)
+      gtk_gl_area_draw_error_screen (area,
+                                     cr,
+                                     gtk_widget_get_allocated_width (widget),
+                                     gtk_widget_get_allocated_height (widget));
+  return FALSE;
+#endif
 }
 
 static gboolean
diff --git a/gtk/inspector/general.c b/gtk/inspector/general.c
index 4fd0c3039c..a8e59ed077 100644
--- a/gtk/inspector/general.c
+++ b/gtk/inspector/general.c
@@ -33,8 +33,10 @@
 
 #ifdef GDK_WINDOWING_X11
 #include "x11/gdkx.h"
+#ifdef HAVE_OPENGL
 #include <epoxy/glx.h>
 #endif
+#endif
 
 #ifdef GDK_WINDOWING_WIN32
 #include "win32/gdkwin32.h"
@@ -217,6 +219,7 @@ add_label_row (GtkInspectorGeneral *gen,
   gtk_size_group_add_widget (GTK_SIZE_GROUP (gen->priv->labels), label);
 }
 
+#ifdef HAVE_OPENGL
 #ifdef GDK_WINDOWING_X11
 static void
 append_glx_extension_row (GtkInspectorGeneral *gen,
@@ -226,6 +229,7 @@ append_glx_extension_row (GtkInspectorGeneral *gen,
   add_check_row (gen, GTK_LIST_BOX (gen->priv->gl_box), ext, epoxy_has_glx_extension (dpy, 0, ext), 0);
 }
 #endif
+#endif
 
 #ifdef GDK_WINDOWING_WAYLAND
 static void
@@ -275,6 +279,7 @@ wayland_get_display (struct wl_display *wl_display)
 static void
 init_gl (GtkInspectorGeneral *gen)
 {
+#ifdef HAVE_OPENGL
 #ifdef GDK_WINDOWING_X11
   if (GDK_IS_X11_DISPLAY (gdk_display_get_default ()))
     {
@@ -301,6 +306,7 @@ init_gl (GtkInspectorGeneral *gen)
     }
   else
 #endif
+#endif
 #ifdef GDK_WINDOWING_WAYLAND
   if (GDK_IS_WAYLAND_DISPLAY (gdk_display_get_default ()))
     {
diff --git a/meson.build b/meson.build
index aed48fc3f6..bfc33af0f6 100644
--- a/meson.build
+++ b/meson.build
@@ -137,6 +137,7 @@ wayland_enabled        = get_option('wayland_backend')
 broadway_enabled       = get_option('broadway_backend')
 quartz_enabled         = get_option('quartz_backend')
 win32_enabled          = get_option('win32_backend')
+opengl_enabled         = get_option('opengl')
 
 os_unix   = false
 os_linux  = false
@@ -430,7 +431,7 @@ pangocairo_dep = dependency('pangocairo', version: cairo_req,
                             fallback : ['pango', 'libpangocairo_dep'])
 pixbuf_dep     = dependency('gdk-pixbuf-2.0', version: gdk_pixbuf_req,
                             fallback : ['gdk-pixbuf', 'gdkpixbuf_dep'])
-epoxy_dep      = dependency('epoxy', version: epoxy_req,
+epoxy_dep      = dependency('epoxy', version: epoxy_req, required: opengl_enabled,
                             fallback: ['libepoxy', 'libepoxy_dep'])
 atk_dep        = dependency('atk', version: atk_req,
                             fallback : ['atk', 'libatk_dep'])
@@ -476,6 +477,10 @@ if tracker3_enabled
   endif
 endif
 
+if opengl_enabled
+  cdata.set('HAVE_OPENGL', 1)
+endif
+
 if iso_codes_dep.found()
   cdata.set_quoted('ISO_CODES_PREFIX', iso_codes_dep.get_variable(pkgconfig: 'prefix'))
 else
@@ -912,9 +917,15 @@ else
   gio_packages = ['gio-2.0', glib_req]
 endif
 
+if opengl_enabled
+  epoxy_packages = ['epoxy', epoxy_req]
+else
+  epoxy_packages = []
+endif
+
 pkgconf.set('GDK_PRIVATE_PACKAGES',
             ' '.join(gio_packages + x11_pkgs + wayland_pkgs + cairo_backends +
-                     ['epoxy', epoxy_req] + cloudproviders_packages +
+                     epoxy_packages + cloudproviders_packages +
                      ['fribidi', fribidi_req]))
 
 gtk_packages = ' '.join([
@@ -928,7 +939,7 @@ pkgconf.set('GTK_PACKAGES', gtk_packages)
 # Requires.private
 pc_gdk_extra_libs += cairo_libs
 
-gtk_private_packages = atk_pkgs + wayland_pkgs + ['epoxy', epoxy_req, 'fribidi', fribidi_req]
+gtk_private_packages = atk_pkgs + wayland_pkgs + epoxy_packages + ['fribidi', fribidi_req]
 if wayland_enabled or x11_enabled
   gtk_private_packages += ['pangoft2']
 endif
diff --git a/meson_options.txt b/meson_options.txt
index 94099aa01e..8bd096896d 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -19,6 +19,8 @@ option('profiler', type: 'boolean', value: false,
   description : 'Enable profiler support')
 option('tracker3', type: 'boolean', value: false,
   description : 'Enable Tracker3 filechooser search')
+option('opengl', type: 'boolean', value: true,
+  description : 'Enable use of GL')
 
 # Print backends
 option('print_backends', type : 'string', value : 'auto',
diff --git a/tests/meson.build b/tests/meson.build
index 586fe2f45e..6ecf317dde 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -5,7 +5,6 @@ gtk_tests = [
   ['scrolling-performance', ['frame-stats.c', 'variable.c']],
   ['blur-performance', ['../gtk/gtkcairoblur.c']],
   ['flicker'],
-  ['gdkgears', ['gtkgears.c']],
   ['listmodel'],
   ['motion-compression'],
   ['styleexamples'],
@@ -54,7 +53,6 @@ gtk_tests = [
   ['testfullscreen'],
   ['testgeometry'],
   ['testgiconpixbuf'],
-  ['testglblending', ['gtkgears.c']],
   ['testgmenu'],
   ['testgrid'],
   ['testgrouping'],
@@ -137,6 +135,13 @@ if x11_enabled
   ]
 endif
 
+if opengl_enabled
+  gtk_tests += [
+    ['gdkgears', ['gtkgears.c']],
+    ['testglblending', ['gtkgears.c']],
+  ]
+endif
+
 if os_linux
   gtk_tests += [['testfontchooserdialog']]
 endif
diff --git a/testsuite/gtk/objects-finalize.c b/testsuite/gtk/objects-finalize.c
index 24540e313f..e0f863ab6a 100644
--- a/testsuite/gtk/objects-finalize.c
+++ b/testsuite/gtk/objects-finalize.c
@@ -116,7 +116,9 @@ main (int argc, char **argv)
 	  all_types[i] != GDK_TYPE_X11_DEVICE_MANAGER_CORE &&
 	  all_types[i] != GDK_TYPE_X11_DEVICE_MANAGER_XI2 &&
 	  all_types[i] != GDK_TYPE_X11_DISPLAY_MANAGER &&
+#ifdef HAVE_OPENGL
 	  all_types[i] != GDK_TYPE_X11_GL_CONTEXT &&
+#endif
 #endif
 	  /* Not allowed to finalize a GdkPixbufLoader without calling gdk_pixbuf_loader_close() */
 	  all_types[i] != GDK_TYPE_PIXBUF_LOADER &&
-- 
2.30.2