[mutter] egl: Add helpers for importing Wayland buffers as EGLImage's

[Jonas Ådahl <jadahl src gnome org>]

commit 659c98733540b61624d5a1487d5b636000056332
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Oct 20 14:15:28 2016 +0800

    egl: Add helpers for importing Wayland buffers as EGLImage's
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773629

 src/backends/meta-egl-ext.h |   28 ++++++++++++++++
 src/backends/meta-egl.c     |   73 +++++++++++++++++++++++++++++++++++++++++++
 src/backends/meta-egl.h     |   20 ++++++++++++
 3 files changed, 121 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-egl-ext.h b/src/backends/meta-egl-ext.h
index eff8508..78fd9a2 100644
--- a/src/backends/meta-egl-ext.h
+++ b/src/backends/meta-egl-ext.h
@@ -31,6 +31,34 @@
 #include <EGL/eglext.h>
 
 /*
+ * This is a little different to the tests shipped with EGL implementations,
+ * which wrap the entire thing in #ifndef EGL_WL_bind_wayland_display, then go
+ * on to define both BindWaylandDisplay and QueryWaylandBuffer.
+ *
+ * Unfortunately, some implementations (particularly the version of Mesa shipped
+ * in Ubuntu 12.04) define EGL_WL_bind_wayland_display, but then only provide
+ * prototypes for (Un)BindWaylandDisplay, completely omitting
+ * QueryWaylandBuffer.
+ *
+ * Detect this, and provide our own definitions if necessary.
+ */
+#ifndef EGL_WAYLAND_BUFFER_WL
+#define EGL_WAYLAND_BUFFER_WL          0x31D5 /* eglCreateImageKHR target */
+#define EGL_WAYLAND_PLANE_WL           0x31D6 /* eglCreateImageKHR target */
+
+#define EGL_TEXTURE_Y_U_V_WL            0x31D7
+#define EGL_TEXTURE_Y_UV_WL             0x31D8
+#define EGL_TEXTURE_Y_XUXV_WL           0x31D9
+#define EGL_TEXTURE_EXTERNAL_WL         0x31DA
+
+struct wl_resource;
+#ifdef EGL_EGLEXT_PROTOTYPES
+EGLAPI EGLBoolean EGLAPIENTRY eglQueryWaylandBufferWL(EGLDisplay dpy, struct wl_resource *buffer, EGLint 
attribute, EGLint *value);
+#endif
+typedef EGLBoolean (EGLAPIENTRYP PFNEGLQUERYWAYLANDBUFFERWL) (EGLDisplay dpy, struct wl_resource *buffer, 
EGLint attribute, EGLint *value);
+#endif
+
+/*
  * FIXME: Remove both EGL_EXT_stream_acquire_mode and
  *        EGL_NV_output_drm_flip_event definitions below once both extensions
  *        get published by Khronos and incorportated into Khronos' header files
diff --git a/src/backends/meta-egl.c b/src/backends/meta-egl.c
index 5692012..e61790a 100644
--- a/src/backends/meta-egl.c
+++ b/src/backends/meta-egl.c
@@ -41,6 +41,11 @@ struct _MetaEgl
 
   PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT;
 
+  PFNEGLCREATEIMAGEKHRPROC eglCreateImageKHR;
+  PFNEGLDESTROYIMAGEKHRPROC eglDestroyImageKHR;
+
+  PFNEGLQUERYWAYLANDBUFFERWL eglQueryWaylandBufferWL;
+
   PFNEGLQUERYDEVICESEXTPROC eglQueryDevicesEXT;
   PFNEGLQUERYDEVICESTRINGEXTPROC eglQueryDeviceStringEXT;
 
@@ -327,6 +332,69 @@ meta_egl_get_platform_display (MetaEgl      *egl,
   return display;
 }
 
+EGLImageKHR
+meta_egl_create_image (MetaEgl        *egl,
+                       EGLDisplay      display,
+                       EGLContext      context,
+                       EGLenum         target,
+                       EGLClientBuffer buffer,
+                       const EGLint   *attrib_list,
+                       GError        **error)
+{
+  EGLImageKHR image;
+
+  if (!is_egl_proc_valid (egl->eglCreateImageKHR, error))
+    return EGL_NO_IMAGE_KHR;
+
+  image = egl->eglCreateImageKHR (display, context,
+                                  target, buffer, attrib_list);
+  if (image == EGL_NO_IMAGE_KHR)
+    {
+      set_egl_error (error);
+      return EGL_NO_IMAGE_KHR;
+    }
+
+  return image;
+}
+
+gboolean
+meta_egl_destroy_image (MetaEgl    *egl,
+                        EGLDisplay  display,
+                        EGLImageKHR image,
+                        GError    **error)
+{
+  if (!is_egl_proc_valid (egl->eglDestroyImageKHR, error))
+    return FALSE;
+
+  if (!egl->eglDestroyImageKHR (display, image))
+    {
+      set_egl_error (error);
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+gboolean
+meta_egl_query_wayland_buffer (MetaEgl            *egl,
+                               EGLDisplay          display,
+                               struct wl_resource *buffer,
+                               EGLint              attribute,
+                               EGLint             *value,
+                               GError            **error)
+{
+  if (!is_egl_proc_valid (egl->eglQueryWaylandBufferWL, error))
+   return FALSE;
+
+  if (!egl->eglQueryWaylandBufferWL (display, buffer, attribute, value))
+    {
+      set_egl_error (error);
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
 gboolean
 meta_egl_query_devices (MetaEgl      *egl,
                         EGLint        max_devices,
@@ -604,6 +672,11 @@ meta_egl_constructed (GObject *object)
 
   GET_EGL_PROC_ADDR_REQUIRED (eglGetPlatformDisplayEXT);
 
+  GET_EGL_PROC_ADDR (eglCreateImageKHR);
+  GET_EGL_PROC_ADDR (eglDestroyImageKHR);
+
+  GET_EGL_PROC_ADDR (eglQueryWaylandBufferWL);
+
   GET_EGL_PROC_ADDR (eglQueryDevicesEXT);
   GET_EGL_PROC_ADDR (eglQueryDeviceStringEXT);
 
diff --git a/src/backends/meta-egl.h b/src/backends/meta-egl.h
index aa38a5c..191955c 100644
--- a/src/backends/meta-egl.h
+++ b/src/backends/meta-egl.h
@@ -48,6 +48,19 @@ gboolean meta_egl_choose_config (MetaEgl      *egl,
                                  EGLConfig    *chosen_config,
                                  GError      **error);
 
+EGLImageKHR meta_egl_create_image (MetaEgl        *egl,
+                                   EGLDisplay      display,
+                                   EGLContext      context,
+                                   EGLenum         target,
+                                   EGLClientBuffer buffer,
+                                   const EGLint   *attrib_list,
+                                   GError        **error);
+
+gboolean meta_egl_destroy_image (MetaEgl    *egl,
+                                 EGLDisplay  display,
+                                 EGLImageKHR image,
+                                 GError    **error);
+
 EGLSurface meta_egl_create_pbuffer_surface (MetaEgl      *egl,
                                             EGLDisplay    display,
                                             EGLConfig     config,
@@ -60,6 +73,13 @@ EGLDisplay meta_egl_get_platform_display (MetaEgl      *egl,
                                           const EGLint *attrib_list,
                                           GError      **error);
 
+gboolean meta_egl_query_wayland_buffer (MetaEgl            *egl,
+                                        EGLDisplay          display,
+                                        struct wl_resource *buffer,
+                                        EGLint              attribute,
+                                        EGLint             *value,
+                                        GError            **error);
+
 gboolean meta_egl_query_devices (MetaEgl      *egl,
                                  EGLint        max_devices,
                                  EGLDeviceEXT *devices,