mutter/cogl/winsys/cogl-winsys-egl.c

/*
 * Cogl
 *
 * An object oriented GL/GLES Abstraction/Utility Layer
 *
 * Copyright (C) 2007,2008,2009,2010,2011 Intel Corporation.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see
 * <http://www.gnu.org/licenses/>.
 *
 *
 * Authors:
 *   Robert Bragg <robert@linux.intel.com>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "cogl.h"

#include "cogl-util.h"
#include "cogl-winsys-egl-private.h"
#include "cogl-winsys-private.h"
#include "cogl-feature-private.h"
#include "cogl-context-private.h"
#include "cogl-framebuffer.h"
#include "cogl-onscreen-private.h"
#include "cogl-swap-chain-private.h"
#include "cogl-renderer-private.h"
#include "cogl-onscreen-template-private.h"
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
#include "cogl-xlib-renderer-private.h"
#include "cogl-xlib-display-private.h"
#include "cogl-xlib-renderer.h"
#endif

#ifdef COGL_HAS_XLIB_SUPPORT
#include "cogl-texture-pixmap-x11-private.h"
#include "cogl-texture-2d-private.h"
#endif

#include "cogl-private.h"

#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
#include <wayland-client.h>
#include <wayland-egl.h>
#endif

#ifdef COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT
#include <android/native_window.h>
#endif

#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
#include "cogl-winsys-kms.h"
#endif

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <glib/gi18n-lib.h>

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
#include <X11/Xlib.h>

#define COGL_ONSCREEN_X11_EVENT_MASK StructureNotifyMask
#endif

#define MAX_EGL_CONFIG_ATTRIBS 30

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
typedef struct _CoglOnscreenXlib
{
  Window xwin;
  gboolean is_foreign_xwin;
} CoglOnscreenXlib;
#endif

typedef struct _CoglOnscreenEGL
{
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  CoglOnscreenXlib _parent;
#endif

#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
  struct wl_egl_window *wayland_egl_native_window;
  struct wl_surface *wayland_surface;
#endif

#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  CoglOnscreenKMS kms_onscreen;
#else
  EGLSurface egl_surface;
#endif
} CoglOnscreenEGL;

#ifdef EGL_KHR_image_pixmap
typedef struct _CoglTexturePixmapEGL
{
  EGLImageKHR image;
  CoglTexture *texture;
} CoglTexturePixmapEGL;
#endif

/* Define a set of arrays containing the functions required from GL
   for each winsys feature */
#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names,    \
                                  egl_private_flags)                    \
  static const CoglFeatureFunction                                      \
  cogl_egl_feature_ ## name ## _funcs[] = {
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args)                   \
  { G_STRINGIFY (name), G_STRUCT_OFFSET (CoglRendererEGL, pf_ ## name) },
#define COGL_WINSYS_FEATURE_END()               \
  { NULL, 0 },                                  \
    };
#include "cogl-winsys-egl-feature-functions.h"

/* Define an array of features */
#undef COGL_WINSYS_FEATURE_BEGIN
#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names,    \
                                  egl_private_flags)                    \
  { 255, 255, 0, namespaces, extension_names,                           \
      0, egl_private_flags,                                             \
      0,                                                                \
      cogl_egl_feature_ ## name ## _funcs },
#undef COGL_WINSYS_FEATURE_FUNCTION
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args)
#undef COGL_WINSYS_FEATURE_END
#define COGL_WINSYS_FEATURE_END()

static const CoglFeatureData winsys_feature_data[] =
  {
#include "cogl-winsys-egl-feature-functions.h"
  };

static CoglFuncPtr
_cogl_winsys_renderer_get_proc_address (CoglRenderer *renderer,
                                        const char *name)
{
  void *ptr;

  ptr = eglGetProcAddress (name);

  /* eglGetProcAddress doesn't support fetching core API so we need to
     get that separately with GModule */
  if (ptr == NULL)
    g_module_symbol (renderer->libgl_module, name, &ptr);

  return ptr;
}

#ifdef COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT
static ANativeWindow *android_native_window;

void
cogl_android_set_native_window (ANativeWindow *window)
{
  _cogl_init ();

  android_native_window = window;
}
#endif

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
static CoglOnscreen *
find_onscreen_for_xid (CoglContext *context, guint32 xid)
{
  GList *l;

  for (l = context->framebuffers; l; l = l->next)
    {
      CoglFramebuffer *framebuffer = l->data;
      CoglOnscreenXlib *xlib_onscreen;

      if (!framebuffer->type == COGL_FRAMEBUFFER_TYPE_ONSCREEN)
        continue;

      xlib_onscreen = COGL_ONSCREEN (framebuffer)->winsys;
      if (xlib_onscreen->xwin == (Window)xid)
        return COGL_ONSCREEN (framebuffer);
    }

  return NULL;
}

static CoglFilterReturn
event_filter_cb (XEvent *xevent, void *data)
{
  CoglContext *context = data;

  if (xevent->type == ConfigureNotify)
    {
      CoglOnscreen *onscreen =
        find_onscreen_for_xid (context, xevent->xconfigure.window);

      if (onscreen)
        {
          CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);

          _cogl_framebuffer_winsys_update_size (framebuffer,
                                                xevent->xconfigure.width,
                                                xevent->xconfigure.height);
        }
    }

  return COGL_FILTER_CONTINUE;
}
#endif /* COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT */

static void
_cogl_winsys_renderer_disconnect (CoglRenderer *renderer)
{
  CoglRendererEGL *egl_renderer = renderer->winsys;

#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
  if (egl_renderer->gdl_initialized)
    gdl_close ();
#endif

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  _cogl_xlib_renderer_disconnect (renderer);
#endif

  eglTerminate (egl_renderer->edpy);

  g_slice_free (CoglRendererEGL, egl_renderer);
}

#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT

static void
display_handle_global_cb (struct wl_display *display,
                          uint32_t id,
                          const char *interface,
                          uint32_t version,
                          void *data)
{
  CoglRendererEGL *egl_renderer = (CoglRendererEGL *)data;

  if (strcmp (interface, "wl_compositor") == 0)
    egl_renderer->wayland_compositor =
      wl_display_bind (display, id, &wl_compositor_interface);
  else if (strcmp(interface, "wl_shell") == 0)
    egl_renderer->wayland_shell =
      wl_display_bind (display, id, &wl_shell_interface);
}

#endif

/* Updates all the function pointers */
static void
check_egl_extensions (CoglRenderer *renderer)
{
  CoglRendererEGL *egl_renderer = renderer->winsys;
  const char *egl_extensions;
  int i;

  egl_extensions = eglQueryString (egl_renderer->edpy, EGL_EXTENSIONS);

  COGL_NOTE (WINSYS, "  EGL Extensions: %s", egl_extensions);

  egl_renderer->private_features = 0;
  for (i = 0; i < G_N_ELEMENTS (winsys_feature_data); i++)
    if (_cogl_feature_check (renderer,
                             "EGL", winsys_feature_data + i, 0, 0,
                             COGL_DRIVER_GL, /* the driver isn't used */
                             egl_extensions,
                             egl_renderer))
      {
        egl_renderer->private_features |=
          winsys_feature_data[i].feature_flags_private;
      }
}

static gboolean
_cogl_winsys_renderer_connect (CoglRenderer *renderer,
                               GError **error)
{
  CoglRendererEGL *egl_renderer;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  CoglXlibRenderer *xlib_renderer;
#endif
  EGLBoolean status;
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
  gdl_ret_t rc = GDL_SUCCESS;
  gdl_display_info_t gdl_display_info;
#endif

  renderer->winsys = g_slice_new0 (CoglRendererEGL);

  egl_renderer = renderer->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  xlib_renderer = renderer->winsys;

  if (!_cogl_xlib_renderer_connect (renderer, error))
    goto error;

  egl_renderer->edpy =
    eglGetDisplay ((NativeDisplayType) xlib_renderer->xdpy);

  status = eglInitialize (egl_renderer->edpy,
                          &egl_renderer->egl_version_major,
                          &egl_renderer->egl_version_minor);

#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)

  /* The EGL API doesn't provide for a way to explicitly select a
   * platform when the driver can support multiple. Mesa allows
   * selection using an environment variable though so that's what
   * we're doing here... */
  setenv("EGL_PLATFORM", "wayland", 1);

  if (renderer->foreign_wayland_display)
    {
      egl_renderer->wayland_display = renderer->foreign_wayland_display;
      /* XXX: For now we have to assume that if a foreign display is
       * given then a foreign compositor and shell must also have been
       * given because wayland doesn't provide a way to
       * retrospectively be notified of the these objects. */
      g_assert (renderer->foreign_wayland_compositor);
      g_assert (renderer->foreign_wayland_shell);
      egl_renderer->wayland_compositor = renderer->foreign_wayland_compositor;
      egl_renderer->wayland_shell = renderer->foreign_wayland_shell;
    }
  else
    {
      egl_renderer->wayland_display = wl_display_connect (NULL);
      if (!egl_renderer->wayland_display)
        {
          g_set_error (error, COGL_WINSYS_ERROR,
                       COGL_WINSYS_ERROR_INIT,
                       "Failed to connect wayland display");
          goto error;
        }

      wl_display_add_global_listener (egl_renderer->wayland_display,
                                      display_handle_global_cb,
                                      egl_renderer);
    }

  /*
   * Ensure that that we've received the messages setting up the compostor and
   * shell object. This is better than just wl_display_iterate since it will
   * always ensure that something is available to be read
   */
  while (!(egl_renderer->wayland_compositor && egl_renderer->wayland_shell))
    wl_display_roundtrip (egl_renderer->wayland_display);

  egl_renderer->edpy =
    eglGetDisplay ((EGLNativeDisplayType)egl_renderer->wayland_display);

  status = eglInitialize (egl_renderer->edpy,
			  &egl_renderer->egl_version_major,
			  &egl_renderer->egl_version_minor);

#elif defined (COGL_HAS_EGL_PLATFORM_KMS_SUPPORT)
  if (!_cogl_winsys_kms_connect (&egl_renderer->kms_renderer, error))
    goto error;
  egl_renderer->edpy = egl_renderer->kms_renderer.dpy;
  status = EGL_TRUE;
#else
  egl_renderer->edpy = eglGetDisplay (EGL_DEFAULT_DISPLAY);

  status = eglInitialize (egl_renderer->edpy,
			  &egl_renderer->egl_version_major,
			  &egl_renderer->egl_version_minor);
#endif

  if (status != EGL_TRUE)
    {
      g_set_error (error, COGL_WINSYS_ERROR,
                   COGL_WINSYS_ERROR_INIT,
                   "Failed to initialize EGL");
      goto error;
    }

#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
  /* Check we can talk to the GDL library */

  rc = gdl_init (NULL);
  if (rc != GDL_SUCCESS)
    {
      g_set_error (error, COGL_WINSYS_ERROR,
                   COGL_WINSYS_ERROR_INIT,
                   "GDL initialize failed. %s",
                   gdl_get_error_string (rc));
      goto error;
    }

  rc = gdl_get_display_info (GDL_DISPLAY_ID_0, &gdl_display_info);
  if (rc != GDL_SUCCESS)
    {
      g_set_error (error, COGL_WINSYS_ERROR,
                   COGL_WINSYS_ERROR_INIT,
                   "GDL failed to get display information: %s",
                   gdl_get_error_string (rc));
      gdl_close ();
      goto error;
    }

  gdl_close ();
#endif

  check_egl_extensions (renderer);

  return TRUE;

error:
  _cogl_winsys_renderer_disconnect (renderer);
  return FALSE;
}

static gboolean
update_winsys_features (CoglContext *context, GError **error)
{
  CoglDisplayEGL *egl_display = context->display->winsys;
  CoglRendererEGL *egl_renderer = context->display->renderer->winsys;

  _COGL_RETURN_VAL_IF_FAIL (egl_display->egl_context, FALSE);

  memset (context->winsys_features, 0, sizeof (context->winsys_features));

  check_egl_extensions (context->display->renderer);

  if (!_cogl_context_update_features (context, error))
    return FALSE;

#if defined (COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT) || \
    defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
  context->feature_flags |= COGL_FEATURE_ONSCREEN_MULTIPLE;
  COGL_FLAGS_SET (context->features,
                  COGL_FEATURE_ID_ONSCREEN_MULTIPLE, TRUE);
  COGL_FLAGS_SET (context->winsys_features,
                  COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN,
                  TRUE);
#endif

  if (egl_renderer->private_features & COGL_EGL_WINSYS_FEATURE_SWAP_REGION)
    {
      COGL_FLAGS_SET (context->winsys_features,
                      COGL_WINSYS_FEATURE_SWAP_REGION, TRUE);
      COGL_FLAGS_SET (context->winsys_features,
                      COGL_WINSYS_FEATURE_SWAP_REGION_THROTTLE, TRUE);
    }

  return TRUE;
}

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
static XVisualInfo *
get_visual_info (CoglDisplay *display, EGLConfig egl_config)
{
  CoglXlibRenderer *xlib_renderer = display->renderer->winsys;
  CoglRendererEGL *egl_renderer = display->renderer->winsys;
  XVisualInfo visinfo_template;
  int template_mask = 0;
  XVisualInfo *visinfo = NULL;
  int visinfos_count;
  EGLint visualid, red_size, green_size, blue_size, alpha_size;

  eglGetConfigAttrib (egl_renderer->edpy, egl_config,
                      EGL_NATIVE_VISUAL_ID, &visualid);

  if (visualid != 0)
    {
      visinfo_template.visualid = visualid;
      template_mask |= VisualIDMask;
    }
  else
    {
      /* some EGL drivers don't implement the EGL_NATIVE_VISUAL_ID
       * attribute, so attempt to find the closest match. */

      eglGetConfigAttrib (egl_renderer->edpy, egl_config,
                          EGL_RED_SIZE, &red_size);
      eglGetConfigAttrib (egl_renderer->edpy, egl_config,
                          EGL_GREEN_SIZE, &green_size);
      eglGetConfigAttrib (egl_renderer->edpy, egl_config,
                          EGL_BLUE_SIZE, &blue_size);
      eglGetConfigAttrib (egl_renderer->edpy, egl_config,
                          EGL_ALPHA_SIZE, &alpha_size);

      visinfo_template.depth = red_size + green_size + blue_size + alpha_size;
      template_mask |= VisualDepthMask;

      visinfo_template.screen = DefaultScreen (xlib_renderer->xdpy);
      template_mask |= VisualScreenMask;
    }

  visinfo = XGetVisualInfo (xlib_renderer->xdpy,
                            template_mask,
                            &visinfo_template,
                            &visinfos_count);

  return visinfo;
}
#endif

static void
egl_attributes_from_framebuffer_config (CoglDisplay *display,
                                        CoglFramebufferConfig *config,
                                        gboolean needs_stencil_override,
                                        EGLint *attributes)
{
  int i = 0;

  attributes[i++] = EGL_STENCIL_SIZE;
  attributes[i++] = needs_stencil_override ? 2 : 0;

  attributes[i++] = EGL_RED_SIZE;
  attributes[i++] = 1;
  attributes[i++] = EGL_GREEN_SIZE;
  attributes[i++] = 1;
  attributes[i++] = EGL_BLUE_SIZE;
  attributes[i++] = 1;

  attributes[i++] = EGL_ALPHA_SIZE;
  attributes[i++] = config->swap_chain->has_alpha ? 1 : EGL_DONT_CARE;

  attributes[i++] = EGL_DEPTH_SIZE;
  attributes[i++] = 1;

  /* XXX: Why does the GDL platform choose these by default? */
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
  attributes[i++] = EGL_BIND_TO_TEXTURE_RGBA;
  attributes[i++] = EGL_TRUE;
  attributes[i++] = EGL_BIND_TO_TEXTURE_RGB;
  attributes[i++] = EGL_TRUE;
#endif

  attributes[i++] = EGL_BUFFER_SIZE;
  attributes[i++] = EGL_DONT_CARE;

  attributes[i++] = EGL_RENDERABLE_TYPE;
  attributes[i++] = (display->renderer->driver == COGL_DRIVER_GL ?
                      EGL_OPENGL_BIT :
                      display->renderer->driver == COGL_DRIVER_GLES1 ?
                      EGL_OPENGL_ES_BIT :
                      EGL_OPENGL_ES2_BIT);

  attributes[i++] = EGL_SURFACE_TYPE;
  attributes[i++] = EGL_WINDOW_BIT;

  if (config->samples_per_pixel)
    {
       attributes[i++] = EGL_SAMPLE_BUFFERS;
       attributes[i++] = 1;
       attributes[i++] = EGL_SAMPLES;
       attributes[i++] = config->samples_per_pixel;
    }

  attributes[i++] = EGL_NONE;

  g_assert (i < MAX_EGL_CONFIG_ATTRIBS);
}

static gboolean
try_create_context (CoglDisplay *display,
                    gboolean with_stencil_buffer,
                    GError **error)
{
  CoglDisplayEGL *egl_display = display->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  CoglXlibDisplay *xlib_display = display->winsys;
  CoglXlibRenderer *xlib_renderer = display->renderer->winsys;
#endif
  CoglRendererEGL *egl_renderer = display->renderer->winsys;
#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  EGLDisplay edpy;
  EGLConfig config;
  EGLint config_count = 0;
  EGLBoolean status;
  EGLint attribs[3];
#endif
  EGLint cfg_attribs[MAX_EGL_CONFIG_ATTRIBS];
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  XVisualInfo *xvisinfo;
  XSetWindowAttributes attrs;
#endif
  const char *error_message;

  egl_attributes_from_framebuffer_config (display,
                                          &display->onscreen_template->config,
                                          with_stencil_buffer,
                                          cfg_attribs);

  _COGL_RETURN_VAL_IF_FAIL (egl_display->egl_context == NULL, TRUE);

  if (display->renderer->driver == COGL_DRIVER_GL)
    eglBindAPI (EGL_OPENGL_API);

#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  edpy = egl_renderer->edpy;

  status = eglChooseConfig (edpy,
                            cfg_attribs,
                            &config, 1,
                            &config_count);
  if (status != EGL_TRUE || config_count == 0)
    {
      error_message = "Unable to find a usable EGL configuration";
      goto fail;
    }

  egl_display->egl_config = config;

  if (display->renderer->driver == COGL_DRIVER_GLES2)
    {
      attribs[0] = EGL_CONTEXT_CLIENT_VERSION;
      attribs[1] = 2;
      attribs[2] = EGL_NONE;
    }
  else
    attribs[0] = EGL_NONE;

  egl_display->egl_context = eglCreateContext (edpy,
                                               config,
                                               EGL_NO_CONTEXT,
                                               attribs);
  if (egl_display->egl_context == EGL_NO_CONTEXT)
    {
      error_message = "Unable to create a suitable EGL context";
      goto fail;
    }
#endif
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT

  xvisinfo = get_visual_info (display, config);
  if (xvisinfo == NULL)
    {
      error_message = "Unable to find suitable X visual";
      goto fail;
    }

  attrs.override_redirect = True;
  attrs.colormap = XCreateColormap (xlib_renderer->xdpy,
                                    DefaultRootWindow (xlib_renderer->xdpy),
                                    xvisinfo->visual,
                                    AllocNone);
  attrs.border_pixel = 0;

  xlib_display->dummy_xwin =
    XCreateWindow (xlib_renderer->xdpy,
                   DefaultRootWindow (xlib_renderer->xdpy),
                   -100, -100, 1, 1,
                   0,
                   xvisinfo->depth,
                   CopyFromParent,
                   xvisinfo->visual,
                   CWOverrideRedirect |
                   CWColormap |
                   CWBorderPixel,
                   &attrs);

  XFree (xvisinfo);

  egl_display->dummy_surface =
    eglCreateWindowSurface (edpy,
                            egl_display->egl_config,
                            (NativeWindowType) xlib_display->dummy_xwin,
                            NULL);

  if (egl_display->dummy_surface == EGL_NO_SURFACE)
    {
      error_message = "Unable to create an EGL surface";
      goto fail;
    }

  if (!eglMakeCurrent (edpy,
                       egl_display->dummy_surface,
                       egl_display->dummy_surface,
                       egl_display->egl_context))
    {
      error_message = "Unable to eglMakeCurrent with dummy surface";
      goto fail;
    }

#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)

  egl_display->wayland_surface =
    wl_compositor_create_surface (egl_renderer->wayland_compositor);
  if (!egl_display->wayland_surface)
    {
      error_message= "Failed to create a dummy wayland surface";
      goto fail;
    }

  egl_display->wayland_egl_native_window =
    wl_egl_window_create (egl_display->wayland_surface,
                          1,
                          1);
  if (!egl_display->wayland_egl_native_window)
    {
      error_message= "Failed to create a dummy wayland native egl surface";
      goto fail;
    }

  egl_display->dummy_surface =
    eglCreateWindowSurface (edpy,
                            egl_display->egl_config,
                            (EGLNativeWindowType)
                            egl_display->wayland_egl_native_window,
                            NULL);
  if (egl_display->dummy_surface == EGL_NO_SURFACE)
    {
      error_message= "Unable to eglMakeCurrent with dummy surface";
      goto fail;
    }

  if (!eglMakeCurrent (edpy,
                       egl_display->dummy_surface,
                       egl_display->dummy_surface,
                       egl_display->egl_context))
    {
      error_message = "Unable to eglMakeCurrent with dummy surface";
      goto fail;
    }

#elif defined (COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT)
  {
    EGLint format;

    if (android_native_window == NULL)
      {
        error_message = "No ANativeWindow window specified with "
          "cogl_android_set_native_window()";
        goto fail;
      }

    /* EGL_NATIVE_VISUAL_ID is an attribute of the EGLConfig that is
     * guaranteed to be accepted by ANativeWindow_setBuffersGeometry ().
     * As soon as we picked a EGLConfig, we can safely reconfigure the
     * ANativeWindow buffers to match, using EGL_NATIVE_VISUAL_ID. */
    eglGetConfigAttrib (edpy, config, EGL_NATIVE_VISUAL_ID, &format);

    ANativeWindow_setBuffersGeometry (android_native_window,
                                      0,
                                      0,
                                      format);

    egl_display->egl_surface =
      eglCreateWindowSurface (edpy,
                              config,
                              (NativeWindowType) android_native_window,
                              NULL);
    if (egl_display->egl_surface == EGL_NO_SURFACE)
      {
        error_message = "Unable to create EGL window surface";
        goto fail;
      }

    if (!eglMakeCurrent (egl_renderer->edpy,
                         egl_display->egl_surface,
                         egl_display->egl_surface,
                         egl_display->egl_context))
      {
        error_message = "Unable to eglMakeCurrent with egl surface";
        goto fail;
      }

    eglQuerySurface (egl_renderer->edpy,
                     egl_display->egl_surface,
                     EGL_WIDTH,
                     &egl_display->egl_surface_width);

    eglQuerySurface (egl_renderer->edpy,
                     egl_display->egl_surface,
                     EGL_HEIGHT,
                     &egl_display->egl_surface_height);
  }

#elif defined (COGL_HAS_EGL_PLATFORM_GDL_SUPPORT)

  egl_display->egl_surface =
    eglCreateWindowSurface (edpy,
                            config,
                            (NativeWindowType) display->gdl_plane,
                            NULL);

  if (egl_display->egl_surface == EGL_NO_SURFACE)
    {
      error_message = "Unable to create EGL window surface";
      goto fail;
    }

  if (!eglMakeCurrent (egl_renderer->edpy,
                       egl_display->egl_surface,
                       egl_display->egl_surface,
                       egl_display->egl_context))
    {
      error_message = "Unable to eglMakeCurrent with egl surface";
      goto fail;
    }

  eglQuerySurface (egl_renderer->edpy,
                   egl_display->egl_surface,
                   EGL_WIDTH,
                   &egl_display->egl_surface_width);

  eglQuerySurface (egl_renderer->edpy,
                   egl_display->egl_surface,
                   EGL_HEIGHT,
                   &egl_display->egl_surface_height);

#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT)

  egl_display->egl_surface =
    eglCreateWindowSurface (edpy,
                            config,
                            (NativeWindowType) NULL,
                            NULL);
  if (egl_display->egl_surface == EGL_NO_SURFACE)
    {
      error_message = "Unable to create EGL window surface";
      goto fail;
    }

  if (!eglMakeCurrent (egl_renderer->edpy,
                       egl_display->egl_surface,
                       egl_display->egl_surface,
                       egl_display->egl_context))
    {
      error_message = "Unable to eglMakeCurrent with egl surface";
      goto fail;
    }

  eglQuerySurface (egl_renderer->edpy,
                   egl_display->egl_surface,
                   EGL_WIDTH,
                   &egl_display->egl_surface_width);

  eglQuerySurface (egl_renderer->edpy,
                   egl_display->egl_surface,
                   EGL_HEIGHT,
                   &egl_display->egl_surface_height);

#elif defined (COGL_HAS_EGL_PLATFORM_KMS_SUPPORT)
  if (!_cogl_winsys_kms_create_context (&egl_renderer->kms_renderer,
                                        &egl_display->kms_display,
                                        error))
    return FALSE;

  egl_display->egl_surface_width = egl_display->kms_display.width;
  egl_display->egl_surface_height = egl_display->kms_display.height;
  egl_display->egl_context = egl_display->kms_display.egl_context;
#else
#error "Unknown EGL platform"
#endif

  return TRUE;

#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
fail:
#endif
  g_set_error (error, COGL_WINSYS_ERROR,
               COGL_WINSYS_ERROR_CREATE_CONTEXT,
               "%s", error_message);
  return FALSE;
}

static void
cleanup_context (CoglDisplay *display)
{
  CoglDisplayEGL *egl_display = display->winsys;
  CoglRendererEGL *egl_renderer = display->renderer->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  CoglXlibDisplay *xlib_display = display->winsys;
  CoglXlibRenderer *xlib_renderer = display->renderer->winsys;
#endif
#if defined (COGL_HAS_EGL_PLATFORM_KMS_SUPPORT)
  GError *error = NULL;

  if (!_cogl_winsys_kms_destroy_context (&egl_renderer->kms_renderer,
                                         &egl_display->kms_display,
                                         &error))
    {
      g_critical (G_STRLOC ": Error cleaning up KMS rendering state: %s", error->message);
      g_clear_error (&error);
    }
#endif

  if (egl_display->egl_context != EGL_NO_CONTEXT)
    {
      eglMakeCurrent (egl_renderer->edpy, EGL_NO_SURFACE, EGL_NO_SURFACE,
                      EGL_NO_CONTEXT);
      eglDestroyContext (egl_renderer->edpy, egl_display->egl_context);
      egl_display->egl_context = EGL_NO_CONTEXT;
    }

#if defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT) || \
    defined (COGL_HAS_EGL_PLATFORM_GDL_SUPPORT)
  if (egl_display->egl_surface != EGL_NO_SURFACE)
    {
      eglDestroySurface (egl_renderer->edpy, egl_display->egl_surface);
      egl_display->egl_surface = EGL_NO_SURFACE;
    }
#elif COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  if (egl_display->dummy_surface != EGL_NO_SURFACE)
    {
      eglDestroySurface (egl_renderer->edpy, egl_display->dummy_surface);
      egl_display->dummy_surface = EGL_NO_SURFACE;
    }

  if (xlib_display->dummy_xwin)
    {
      XDestroyWindow (xlib_renderer->xdpy, xlib_display->dummy_xwin);
      xlib_display->dummy_xwin = None;
    }
#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
  if (egl_display->dummy_surface != EGL_NO_SURFACE)
    {
      eglDestroySurface (egl_renderer->edpy, egl_display->dummy_surface);
      egl_display->dummy_surface = EGL_NO_SURFACE;
    }

  if (egl_display->wayland_egl_native_window)
    {
      wl_egl_window_destroy (egl_display->wayland_egl_native_window);
      egl_display->wayland_egl_native_window = NULL;
    }

  if (egl_display->wayland_surface)
    {
      wl_surface_destroy (egl_display->wayland_surface);
      egl_display->wayland_surface = NULL;
    }
#endif
}

static gboolean
create_context (CoglDisplay *display, GError **error)
{
  CoglDisplayEGL *egl_display = display->winsys;

  /* Note: we don't just rely on eglChooseConfig to correctly
   * report that the driver doesn't support a stencil buffer
   * because we've seen PVR drivers that claim stencil buffer
   * support according to the EGLConfig but then later fail
   * when trying to create a context with such a config.
   */
  if (try_create_context (display, TRUE, error))
    {
      egl_display->stencil_disabled = FALSE;
      return TRUE;
    }
  else
    {
      g_clear_error (error);
      cleanup_context (display);
      egl_display->stencil_disabled = TRUE;
      return try_create_context (display, FALSE, error);
    }
}

static void
_cogl_winsys_display_destroy (CoglDisplay *display)
{
  CoglDisplayEGL *egl_display = display->winsys;

  _COGL_RETURN_IF_FAIL (egl_display != NULL);

  cleanup_context (display);

  g_slice_free (CoglDisplayEGL, display->winsys);
  display->winsys = NULL;
}

#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
static gboolean
gdl_plane_init (CoglDisplay *display, GError **error)
{
  gboolean ret = TRUE;
  gdl_color_space_t colorSpace = GDL_COLOR_SPACE_RGB;
  gdl_pixel_format_t pixfmt = GDL_PF_ARGB_32;
  gdl_rectangle_t dstRect;
  gdl_display_info_t display_info;
  gdl_ret_t rc = GDL_SUCCESS;

  if (!display->gdl_plane)
    {
      g_set_error (error, COGL_WINSYS_ERROR, COGL_WINSYS_ERROR_CREATE_CONTEXT,
                   "No GDL plane specified with "
                   "cogl_gdl_display_set_plane");
      return FALSE;
    }

  rc = gdl_init (NULL);
  if (rc != GDL_SUCCESS)
    {
      g_set_error (error, COGL_WINSYS_ERROR, COGL_WINSYS_ERROR_CREATE_CONTEXT,
                   "GDL initialize failed. %s", gdl_get_error_string (rc));
      return FALSE;
    }

  rc = gdl_get_display_info (GDL_DISPLAY_ID_0, &display_info);
  if (rc != GDL_SUCCESS)
    {
      g_set_error (error, COGL_WINSYS_ERROR, COGL_WINSYS_ERROR_CREATE_CONTEXT,
                   "GDL failed to get display infomation: %s",
                   gdl_get_error_string (rc));
      gdl_close ();
      return FALSE;
    }

  dstRect.origin.x = 0;
  dstRect.origin.y = 0;
  dstRect.width = display_info.tvmode.width;
  dstRect.height = display_info.tvmode.height;

  /* Configure the plane attribute. */
  rc = gdl_plane_reset (display->gdl_plane);
  if (rc == GDL_SUCCESS)
    rc = gdl_plane_config_begin (display->gdl_plane);

  if (rc == GDL_SUCCESS)
    rc = gdl_plane_set_attr (GDL_PLANE_SRC_COLOR_SPACE, &colorSpace);

  if (rc == GDL_SUCCESS)
    rc = gdl_plane_set_attr (GDL_PLANE_PIXEL_FORMAT, &pixfmt);

  if (rc == GDL_SUCCESS)
    rc = gdl_plane_set_attr (GDL_PLANE_DST_RECT, &dstRect);

  /* Default to triple buffering if the swap_chain doesn't have an explicit
   * length */
  if (rc == GDL_SUCCESS)
    {
      if (display->onscreen_template->swap_chain &&
          display->onscreen_template->swap_chain->length != -1)
        rc = gdl_plane_set_uint (GDL_PLANE_NUM_GFX_SURFACES,
                                 display->onscreen_template->swap_chain->length);
      else
        rc = gdl_plane_set_uint (GDL_PLANE_NUM_GFX_SURFACES, 3);
    }

  if (rc == GDL_SUCCESS)
    rc = gdl_plane_config_end (GDL_FALSE);
  else
    gdl_plane_config_end (GDL_TRUE);

  if (rc != GDL_SUCCESS)
    {
      g_set_error (error, COGL_WINSYS_ERROR, COGL_WINSYS_ERROR_CREATE_CONTEXT,
                   "GDL configuration failed: %s.", gdl_get_error_string (rc));
      ret = FALSE;
    }

  gdl_close ();

  return TRUE;
}
#endif

static gboolean
_cogl_winsys_display_setup (CoglDisplay *display,
                            GError **error)
{
  CoglDisplayEGL *egl_display;
#if defined (COGL_HAS_WAYLAND_EGL_SERVER_SUPPORT) || \
  defined (COGL_HAS_EGL_PLATFORM_KMS_SUPPORT)
  CoglRendererEGL *egl_renderer = display->renderer->winsys;
#endif

  _COGL_RETURN_VAL_IF_FAIL (display->winsys == NULL, FALSE);

  egl_display = g_slice_new0 (CoglDisplayEGL);
  display->winsys = egl_display;

#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
  if (!gdl_plane_init (display, error))
    goto error;
#endif

#ifdef COGL_HAS_WAYLAND_EGL_SERVER_SUPPORT
  if (display->wayland_compositor_display)
    {
      struct wl_display *wayland_display = display->wayland_compositor_display;
      egl_renderer->pf_eglBindWaylandDisplay (egl_renderer->edpy,
                                              wayland_display);
    }
#endif

#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  if (!_cogl_winsys_kms_display_setup (display, error))
    goto error;
#endif

  if (!create_context (display, error))
    goto error;

  egl_display->found_egl_config = TRUE;

  return TRUE;

error:
  _cogl_winsys_display_destroy (display);
  return FALSE;
}

static gboolean
_cogl_winsys_context_init (CoglContext *context, GError **error)
{
  context->winsys = g_new0 (CoglContextEGL, 1);

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  cogl_xlib_renderer_add_filter (context->display->renderer,
                                 event_filter_cb,
                                 context);
#endif
  return update_winsys_features (context, error);
}

static void
_cogl_winsys_context_deinit (CoglContext *context)
{
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  cogl_xlib_renderer_remove_filter (context->display->renderer,
                                    event_filter_cb,
                                    context);
#endif
  g_free (context->winsys);
}

static gboolean
_cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
                            GError **error)
{
  CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
  CoglContext *context = framebuffer->context;
  CoglDisplay *display = context->display;
  CoglDisplayEGL *egl_display = display->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  CoglRendererEGL *egl_renderer = display->renderer->winsys;
  CoglXlibRenderer *xlib_renderer = display->renderer->winsys;
  CoglOnscreenXlib *xlib_onscreen;
  Window xwin;
#endif
#if defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT) || \
    defined (COGL_HAS_EGL_PLATFORM_KMS_SUPPORT)
  CoglRendererEGL *egl_renderer = display->renderer->winsys;
#endif
  CoglOnscreenEGL *egl_onscreen;
#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  EGLint attributes[MAX_EGL_CONFIG_ATTRIBS];
  EGLConfig egl_config;
  EGLint config_count = 0;
  EGLBoolean status;
  gboolean need_stencil =
    egl_display->stencil_disabled ? FALSE : framebuffer->config.need_stencil;
#endif

  _COGL_RETURN_VAL_IF_FAIL (egl_display->egl_context, FALSE);


#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  egl_attributes_from_framebuffer_config (display,
                                          &framebuffer->config,
                                          need_stencil,
                                          attributes);

  status = eglChooseConfig (egl_renderer->edpy,
                            attributes,
                            &egl_config, 1,
                            &config_count);
  if (status != EGL_TRUE || config_count == 0)
    {
      g_set_error (error, COGL_WINSYS_ERROR,
                   COGL_WINSYS_ERROR_CREATE_ONSCREEN,
                   "Failed to find a suitable EGL configuration");
      return FALSE;
    }

  /* Update the real number of samples_per_pixel now that we have
   * found an egl_config... */
  if (framebuffer->config.samples_per_pixel)
    {
      EGLint samples;
      status = eglGetConfigAttrib (egl_renderer->edpy,
                                   egl_config,
                                   EGL_SAMPLES, &samples);
      g_return_val_if_fail (status == EGL_TRUE, TRUE);
      framebuffer->samples_per_pixel = samples;
    }
#endif
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT

  /* FIXME: We need to explicitly Select for ConfigureNotify events.
   * For foreign windows we need to be careful not to mess up any
   * existing event mask.
   * We need to document that for windows we create then toolkits
   * must be careful not to clear event mask bits that we select.
   */

  /* XXX: Note we ignore the user's original width/height when
   * given a foreign X window. */
  if (onscreen->foreign_xid)
    {
      Status status;
      CoglXlibTrapState state;
      XWindowAttributes attr;
      int xerror;

      xwin = onscreen->foreign_xid;

      _cogl_xlib_renderer_trap_errors (display->renderer, &state);

      status = XGetWindowAttributes (xlib_renderer->xdpy, xwin, &attr);
      xerror = _cogl_xlib_renderer_untrap_errors (display->renderer, &state);
      if (status == 0 || xerror)
        {
          char message[1000];
          XGetErrorText (xlib_renderer->xdpy, xerror,
                         message, sizeof (message));
          g_set_error (error, COGL_WINSYS_ERROR,
                       COGL_WINSYS_ERROR_CREATE_ONSCREEN,
                       "Unable to query geometry of foreign xid 0x%08lX: %s",
                       xwin, message);
          return FALSE;
        }

      _cogl_framebuffer_winsys_update_size (framebuffer,
                                            attr.width, attr.height);

      /* Make sure the app selects for the events we require... */
      onscreen->foreign_update_mask_callback (onscreen,
                                              COGL_ONSCREEN_X11_EVENT_MASK,
                                              onscreen->foreign_update_mask_data);
    }
  else
    {
      int width;
      int height;
      CoglXlibTrapState state;
      XVisualInfo *xvisinfo;
      XSetWindowAttributes xattr;
      unsigned long mask;
      int xerror;

      width = cogl_framebuffer_get_width (framebuffer);
      height = cogl_framebuffer_get_height (framebuffer);

      _cogl_xlib_renderer_trap_errors (display->renderer, &state);

      xvisinfo = get_visual_info (display, egl_config);
      if (xvisinfo == NULL)
        {
          g_set_error (error, COGL_WINSYS_ERROR,
                       COGL_WINSYS_ERROR_CREATE_ONSCREEN,
                       "Unable to retrieve the X11 visual of context's "
                       "fbconfig");
          return FALSE;
        }

      /* window attributes */
      xattr.background_pixel = WhitePixel (xlib_renderer->xdpy,
                                           DefaultScreen (xlib_renderer->xdpy));
      xattr.border_pixel = 0;
      /* XXX: is this an X resource that we are leaking‽... */
      xattr.colormap = XCreateColormap (xlib_renderer->xdpy,
                                        DefaultRootWindow (xlib_renderer->xdpy),
                                        xvisinfo->visual,
                                        AllocNone);
      xattr.event_mask = COGL_ONSCREEN_X11_EVENT_MASK;

      mask = CWBorderPixel | CWColormap | CWEventMask;

      xwin = XCreateWindow (xlib_renderer->xdpy,
                            DefaultRootWindow (xlib_renderer->xdpy),
                            0, 0,
                            width, height,
                            0,
                            xvisinfo->depth,
                            InputOutput,
                            xvisinfo->visual,
                            mask, &xattr);

      XFree (xvisinfo);

      XSync (xlib_renderer->xdpy, False);
      xerror = _cogl_xlib_renderer_untrap_errors (display->renderer, &state);
      if (xerror)
        {
          char message[1000];
          XGetErrorText (xlib_renderer->xdpy, xerror,
                         message, sizeof (message));
          g_set_error (error, COGL_WINSYS_ERROR,
                       COGL_WINSYS_ERROR_CREATE_ONSCREEN,
                       "X error while creating Window for CoglOnscreen: %s",
                       message);
          return FALSE;
        }
    }
#endif

  onscreen->winsys = g_slice_new0 (CoglOnscreenEGL);
  egl_onscreen = onscreen->winsys;

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  xlib_onscreen = onscreen->winsys;

  xlib_onscreen->xwin = xwin;
  xlib_onscreen->is_foreign_xwin = onscreen->foreign_xid ? TRUE : FALSE;

  egl_onscreen->egl_surface =
    eglCreateWindowSurface (egl_renderer->edpy,
                            egl_config,
                            (NativeWindowType) xlib_onscreen->xwin,
                            NULL);
#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)

  egl_onscreen->wayland_surface =
    wl_compositor_create_surface (egl_renderer->wayland_compositor);
  if (!egl_onscreen->wayland_surface)
    {
      g_set_error (error, COGL_WINSYS_ERROR,
                   COGL_WINSYS_ERROR_CREATE_ONSCREEN,
                   "Error while creating wayland surface for CoglOnscreen");
      return FALSE;
    }

  egl_onscreen->wayland_egl_native_window =
    wl_egl_window_create (egl_onscreen->wayland_surface,
                          cogl_framebuffer_get_width (framebuffer),
                          cogl_framebuffer_get_height (framebuffer));
  if (!egl_onscreen->wayland_egl_native_window)
    {
      g_set_error (error, COGL_WINSYS_ERROR,
                   COGL_WINSYS_ERROR_CREATE_ONSCREEN,
                   "Error while creating wayland egl native window "
                   "for CoglOnscreen");
      return FALSE;
    }

  egl_onscreen->egl_surface =
    eglCreateWindowSurface (egl_renderer->edpy,
                            egl_config,
                            (EGLNativeWindowType)
                            egl_onscreen->wayland_egl_native_window,
                            NULL);

  wl_shell_set_toplevel (egl_renderer->wayland_shell,
                         egl_onscreen->wayland_surface);

#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT) || \
      defined (COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT)      || \
      defined (COGL_HAS_EGL_PLATFORM_GDL_SUPPORT)          || \
      defined (COGL_HAS_EGL_PLATFORM_KMS_SUPPORT)
  if (egl_display->have_onscreen)
    {
      g_set_error (error, COGL_WINSYS_ERROR,
                   COGL_WINSYS_ERROR_CREATE_ONSCREEN,
                   "EGL platform only supports a single onscreen window");
      return FALSE;
    }

#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  if (!_cogl_winsys_kms_onscreen_init (cogl_framebuffer_get_context (framebuffer),
                                       &egl_renderer->kms_renderer,
                                       &egl_display->kms_display,
                                       &egl_onscreen->kms_onscreen,
                                       error))
    return FALSE;
#else
  egl_onscreen->egl_surface = egl_display->egl_surface;
#endif

  _cogl_framebuffer_winsys_update_size (framebuffer,
                                        egl_display->egl_surface_width,
                                        egl_display->egl_surface_height);
  egl_display->have_onscreen = TRUE;
#else
#error "Unknown EGL platform"
#endif

  return TRUE;
}

static void
_cogl_winsys_onscreen_deinit (CoglOnscreen *onscreen)
{
  CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
  CoglContext *context = framebuffer->context;
  CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  CoglXlibRenderer *xlib_renderer = context->display->renderer->winsys;
  CoglXlibTrapState old_state;
  CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT)
  CoglDisplayEGL *egl_display = context->display->winsys;
#endif
  CoglOnscreenEGL *egl_onscreen = onscreen->winsys;

  /* If we never successfully allocated then there's nothing to do */
  if (egl_onscreen == NULL)
    return;
#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  if (egl_onscreen->egl_surface != EGL_NO_SURFACE)
    {
      if (eglDestroySurface (egl_renderer->edpy, egl_onscreen->egl_surface)
          == EGL_FALSE)
        g_warning ("Failed to destroy EGL surface");
      egl_onscreen->egl_surface = EGL_NO_SURFACE;
    }
#endif
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT
  egl_display->have_onscreen = FALSE;
#endif

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
  _cogl_xlib_renderer_trap_errors (context->display->renderer, &old_state);

  if (!xlib_onscreen->is_foreign_xwin && xlib_onscreen->xwin != None)
    {
      XDestroyWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
      xlib_onscreen->xwin = None;
    }
  else
    xlib_onscreen->xwin = None;

  XSync (xlib_renderer->xdpy, False);

  if (_cogl_xlib_renderer_untrap_errors (context->display->renderer,
                                         &old_state) != Success)
    g_warning ("X Error while destroying X window");
#endif

#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
  if (egl_onscreen->wayland_egl_native_window)
    {
      wl_egl_window_destroy (egl_onscreen->wayland_egl_native_window);
      egl_onscreen->wayland_egl_native_window = NULL;
    }

  if (egl_onscreen->wayland_surface)
    {
      wl_surface_destroy (egl_onscreen->wayland_surface);
      egl_onscreen->wayland_surface = NULL;
    }
#endif

#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  _cogl_winsys_kms_onscreen_deinit (&egl_renderer->kms_renderer,
                                    &egl_onscreen->kms_onscreen);
#endif

  g_slice_free (CoglOnscreenEGL, onscreen->winsys);
  onscreen->winsys = NULL;
}

static void
_cogl_winsys_onscreen_bind (CoglOnscreen *onscreen)
{
  CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
  CoglDisplayEGL *egl_display = context->display->winsys;
  CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
  CoglContextEGL *egl_context = context->winsys;
#endif

#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  _cogl_winsys_kms_bind (&egl_renderer->kms_renderer,
                         &egl_display->kms_display);
  return;

#else

  if (egl_context->current_surface == egl_onscreen->egl_surface)
    return;

  if (G_UNLIKELY (!onscreen))
    {
#if defined (COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT) || \
    defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
      eglMakeCurrent (egl_renderer->edpy,
                      egl_display->dummy_surface,
                      egl_display->dummy_surface,
                      egl_display->egl_context);
      egl_context->current_surface = egl_display->dummy_surface;
#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT) || \
      defined (COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT)      || \
      defined (COGL_HAS_EGL_PLATFORM_GDL_SUPPORT)

      return;
#else
#error "Unknown EGL platform"
#endif
    }
  else
    {
      eglMakeCurrent (egl_renderer->edpy,
                      egl_onscreen->egl_surface,
                      egl_onscreen->egl_surface,
                      egl_display->egl_context);
      egl_context->current_surface = egl_onscreen->egl_surface;
    }

  if (onscreen->swap_throttled)
    eglSwapInterval (egl_renderer->edpy, 1);
  else
    eglSwapInterval (egl_renderer->edpy, 0);

#endif
}

static void
_cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
                                   const int *user_rectangles,
                                   int n_rectangles)
{
#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
  CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
  CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
  CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
  int framebuffer_height  = cogl_framebuffer_get_height (framebuffer);
  int *rectangles = g_alloca (sizeof (int) * n_rectangles * 4);
  int i;

  /* eglSwapBuffersRegion expects rectangles relative to the bottom left corner
   * but we are given rectangles relative to the top left so we need to flip
   * them... */
  memcpy (rectangles, user_rectangles, sizeof (int) * n_rectangles * 4);
  for (i = 0; i < n_rectangles; i++)
    {
      int *rect = &rectangles[4 * i];
      rect[1] = framebuffer_height - rect[1] - rect[3];
    }

  /* At least for eglSwapBuffers the EGL spec says that the surface to
     swap must be bound to the current context. It looks like Mesa
     also validates that this is the case for eglSwapBuffersRegion so
     we must bind here too */
  _cogl_framebuffer_flush_state (COGL_FRAMEBUFFER (onscreen),
                                 COGL_FRAMEBUFFER (onscreen),
                                 COGL_FRAMEBUFFER_STATE_BIND);

  if (egl_renderer->pf_eglSwapBuffersRegion (egl_renderer->edpy,
                                             egl_onscreen->egl_surface,
                                             n_rectangles,
                                             rectangles) == EGL_FALSE)
    g_warning ("Error reported by eglSwapBuffersRegion");
#endif
}

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
static void
_cogl_winsys_onscreen_set_visibility (CoglOnscreen *onscreen,
                                      gboolean visibility)
{
  CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
  CoglXlibRenderer *xlib_renderer = context->display->renderer->winsys;
  CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;

  if (visibility)
    XMapWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
  else
    XUnmapWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
}
#endif

static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
{
  CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
  CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
  CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  CoglDisplayEGL *egl_display = context->display->winsys;
#endif

#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  _cogl_winsys_kms_swap_buffers (&egl_renderer->kms_renderer,
                                 &egl_display->kms_display,
                                 &egl_onscreen->kms_onscreen);
  return;
#else
  /* The specification for EGL (at least in 1.4) says that the surface
     needs to be bound to the current context for the swap to work
     although it may change in future. Mesa explicitly checks for this
     and just returns an error if this is not the case so we can't
     just pretend this isn't in the spec. */
  _cogl_framebuffer_flush_state (COGL_FRAMEBUFFER (onscreen),
                                 COGL_FRAMEBUFFER (onscreen),
                                 COGL_FRAMEBUFFER_STATE_BIND);

  eglSwapBuffers (egl_renderer->edpy, egl_onscreen->egl_surface);
#endif

#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
  /*
   * The implementation of eglSwapBuffers may do a flush however the semantics
   * of eglSwapBuffers on Wayland has changed in the past. So to be safe to
   * the implementation changing we should explicitly ensure all messages are
   * sent.
   */
  wl_display_flush (egl_renderer->wayland_display);
#endif
}

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
static guint32
_cogl_winsys_onscreen_x11_get_window_xid (CoglOnscreen *onscreen)
{
  CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
  return xlib_onscreen->xwin;
}
#endif

static void
_cogl_winsys_onscreen_update_swap_throttled (CoglOnscreen *onscreen)
{
#ifndef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
  CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
  CoglContextEGL *egl_context = context->winsys;
  CoglOnscreenEGL *egl_onscreen = onscreen->winsys;

  if (egl_context->current_surface != egl_onscreen->egl_surface)
    return;

  egl_context->current_surface = EGL_NO_SURFACE;
#endif
  _cogl_winsys_onscreen_bind (onscreen);
}

#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
/* XXX: This is a particularly hacky _cogl_winsys interface... */
static XVisualInfo *
_cogl_winsys_xlib_get_visual_info (void)
{
  CoglDisplayEGL *egl_display;

  _COGL_GET_CONTEXT (ctx, NULL);

  _COGL_RETURN_VAL_IF_FAIL (ctx->display->winsys, FALSE);

  egl_display = ctx->display->winsys;

  if (!egl_display->found_egl_config)
    return NULL;

  return get_visual_info (ctx->display, egl_display->egl_config);
}
#endif

static EGLDisplay
_cogl_winsys_context_egl_get_egl_display (CoglContext *context)
{
  CoglRendererEGL *egl_renderer = context->display->renderer->winsys;

  return egl_renderer->edpy;
}

#if defined (COGL_HAS_XLIB_SUPPORT) && defined (EGL_KHR_image_pixmap)
static gboolean
_cogl_winsys_texture_pixmap_x11_create (CoglTexturePixmapX11 *tex_pixmap)
{
  CoglTexturePixmapEGL *egl_tex_pixmap;
  EGLint attribs[] = {EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE};
  CoglPixelFormat texture_format;
  CoglRendererEGL *egl_renderer;

  /* FIXME: It should be possible to get to a CoglContext from any
   * CoglTexture pointer. */
  _COGL_GET_CONTEXT (ctx, FALSE);

  egl_renderer = ctx->display->renderer->winsys;

  if (!(egl_renderer->private_features &
        COGL_EGL_WINSYS_FEATURE_EGL_IMAGE_FROM_X11_PIXMAP) ||
      !(ctx->private_feature_flags &
        COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE))
    {
      tex_pixmap->winsys = NULL;
      return FALSE;
    }

  egl_tex_pixmap = g_new0 (CoglTexturePixmapEGL, 1);

  egl_tex_pixmap->image =
    _cogl_egl_create_image (ctx,
                            EGL_NATIVE_PIXMAP_KHR,
                            (EGLClientBuffer)tex_pixmap->pixmap,
                            attribs);
  if (egl_tex_pixmap->image == EGL_NO_IMAGE_KHR)
    {
      g_free (egl_tex_pixmap);
      return FALSE;
    }

  texture_format = (tex_pixmap->depth >= 32 ?
                    COGL_PIXEL_FORMAT_RGBA_8888_PRE :
                    COGL_PIXEL_FORMAT_RGB_888);

  egl_tex_pixmap->texture = COGL_TEXTURE (
    _cogl_egl_texture_2d_new_from_image (ctx,
                                         tex_pixmap->width,
                                         tex_pixmap->height,
                                         texture_format,
                                         egl_tex_pixmap->image,
                                         NULL));

  tex_pixmap->winsys = egl_tex_pixmap;

  return TRUE;
}

static void
_cogl_winsys_texture_pixmap_x11_free (CoglTexturePixmapX11 *tex_pixmap)
{
  CoglTexturePixmapEGL *egl_tex_pixmap;

  /* FIXME: It should be possible to get to a CoglContext from any
   * CoglTexture pointer. */
  _COGL_GET_CONTEXT (ctx, NO_RETVAL);

  if (!tex_pixmap->winsys)
    return;

  egl_tex_pixmap = tex_pixmap->winsys;

  if (egl_tex_pixmap->texture)
    cogl_object_unref (egl_tex_pixmap->texture);

  if (egl_tex_pixmap->image != EGL_NO_IMAGE_KHR)
    _cogl_egl_destroy_image (ctx, egl_tex_pixmap->image);

  tex_pixmap->winsys = NULL;
  g_free (egl_tex_pixmap);
}

static gboolean
_cogl_winsys_texture_pixmap_x11_update (CoglTexturePixmapX11 *tex_pixmap,
                                        gboolean needs_mipmap)
{
  if (needs_mipmap)
    return FALSE;

  return TRUE;
}

static void
_cogl_winsys_texture_pixmap_x11_damage_notify (CoglTexturePixmapX11 *tex_pixmap)
{
}

static CoglHandle
_cogl_winsys_texture_pixmap_x11_get_texture (CoglTexturePixmapX11 *tex_pixmap)
{
  CoglTexturePixmapEGL *egl_tex_pixmap = tex_pixmap->winsys;

  return egl_tex_pixmap->texture;
}
#endif /* defined (COGL_HAS_XLIB_SUPPORT) && defined (EGL_KHR_image_pixmap) */


static CoglWinsysVtable _cogl_winsys_vtable =
  {
    .id = COGL_WINSYS_ID_EGL,
    .name = "EGL",
    .renderer_get_proc_address = _cogl_winsys_renderer_get_proc_address,
    .renderer_connect = _cogl_winsys_renderer_connect,
    .renderer_disconnect = _cogl_winsys_renderer_disconnect,
    .display_setup = _cogl_winsys_display_setup,
    .display_destroy = _cogl_winsys_display_destroy,
    .context_init = _cogl_winsys_context_init,
    .context_deinit = _cogl_winsys_context_deinit,
    .context_egl_get_egl_display =
      _cogl_winsys_context_egl_get_egl_display,
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
    .xlib_get_visual_info = _cogl_winsys_xlib_get_visual_info,
#endif
    .onscreen_init = _cogl_winsys_onscreen_init,
    .onscreen_deinit = _cogl_winsys_onscreen_deinit,
    .onscreen_bind = _cogl_winsys_onscreen_bind,
    .onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers,
    .onscreen_swap_region = _cogl_winsys_onscreen_swap_region,
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
    .onscreen_set_visibility = _cogl_winsys_onscreen_set_visibility,
#endif
    .onscreen_update_swap_throttled =
      _cogl_winsys_onscreen_update_swap_throttled,
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
    .onscreen_x11_get_window_xid =
      _cogl_winsys_onscreen_x11_get_window_xid,
#endif
#if defined (COGL_HAS_XLIB_SUPPORT) && defined (EGL_KHR_image_pixmap)
    /* X11 tfp support... */
    /* XXX: instead of having a rather monolithic winsys vtable we could
     * perhaps look for a way to separate these... */
    .texture_pixmap_x11_create =
      _cogl_winsys_texture_pixmap_x11_create,
    .texture_pixmap_x11_free =
      _cogl_winsys_texture_pixmap_x11_free,
    .texture_pixmap_x11_update =
      _cogl_winsys_texture_pixmap_x11_update,
    .texture_pixmap_x11_damage_notify =
      _cogl_winsys_texture_pixmap_x11_damage_notify,
    .texture_pixmap_x11_get_texture =
      _cogl_winsys_texture_pixmap_x11_get_texture,
#endif /* defined (COGL_HAS_XLIB_SUPPORT) && defined (EGL_KHR_image_pixmap) */
  };

/* XXX: we use a function because no doubt someone will complain
 * about using c99 member initializers because they aren't portable
 * to windows. We want to avoid having to rigidly follow the real
 * order of members since some members are #ifdefd and we'd have
 * to mirror the #ifdefing to add padding etc. For any winsys that
 * can assume the platform has a sane compiler then we can just use
 * c99 initializers for insane platforms they can initialize
 * the members by name in a function.
 */
const CoglWinsysVtable *
_cogl_winsys_egl_get_vtable (void)
{
  return &_cogl_winsys_vtable;
}

/* FIXME: we should have a separate wayland file for these entry
 * points... */
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
void
cogl_wayland_renderer_set_foreign_display (CoglRenderer *renderer,
                                           struct wl_display *display)
{
  _COGL_RETURN_IF_FAIL (cogl_is_renderer (renderer));

  /* NB: Renderers are considered immutable once connected */
  _COGL_RETURN_IF_FAIL (!renderer->connected);

  renderer->foreign_wayland_display = display;
}

struct wl_display *
cogl_wayland_renderer_get_display (CoglRenderer *renderer)
{
  _COGL_RETURN_VAL_IF_FAIL (cogl_is_renderer (renderer), NULL);

  if (renderer->foreign_wayland_display)
    return renderer->foreign_wayland_display;
  else if (renderer->connected)
    {
      CoglRendererEGL *egl_renderer = renderer->winsys;
      return egl_renderer->wayland_display;
    }
  else
    return NULL;
}

void
cogl_wayland_renderer_set_foreign_compositor (CoglRenderer *renderer,
                                              struct wl_compositor *compositor)
{
  _COGL_RETURN_IF_FAIL (cogl_is_renderer (renderer));

  /* NB: Renderers are considered immutable once connected */
  _COGL_RETURN_IF_FAIL (!renderer->connected);

  renderer->foreign_wayland_compositor = compositor;
}

struct wl_compositor *
cogl_wayland_renderer_get_compositor (CoglRenderer *renderer)
{
  _COGL_RETURN_VAL_IF_FAIL (cogl_is_renderer (renderer), NULL);

  if (renderer->foreign_wayland_compositor)
    return renderer->foreign_wayland_compositor;
  else if (renderer->connected)
    {
      CoglRendererEGL *egl_renderer = renderer->winsys;
      return egl_renderer->wayland_compositor;
    }
  else
    return NULL;
}

void
cogl_wayland_renderer_set_foreign_shell (CoglRenderer *renderer,
                                         struct wl_shell *shell)
{
  _COGL_RETURN_IF_FAIL (cogl_is_renderer (renderer));

  /* NB: Renderers are considered immutable once connected */
  _COGL_RETURN_IF_FAIL (!renderer->connected);

  renderer->foreign_wayland_shell = shell;
}

struct wl_shell *
cogl_wayland_renderer_get_shell (CoglRenderer *renderer)
{
  _COGL_RETURN_VAL_IF_FAIL (cogl_is_renderer (renderer), NULL);

  if (renderer->foreign_wayland_shell)
    return renderer->foreign_wayland_shell;
  else if (renderer->connected)
    {
      CoglRendererEGL *egl_renderer = renderer->winsys;
      return egl_renderer->wayland_shell;
    }
  else
    return NULL;
}

struct wl_surface *
cogl_wayland_onscreen_get_surface (CoglOnscreen *onscreen)
{
  CoglFramebuffer *fb;

  fb = COGL_FRAMEBUFFER (onscreen);
  if (fb->allocated)
    {
      CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
      return egl_onscreen->wayland_surface;
    }
  else
    return NULL;
}

#endif /* COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT */

#ifdef EGL_KHR_image_base
EGLImageKHR
_cogl_egl_create_image (CoglContext *ctx,
                        EGLenum target,
                        EGLClientBuffer buffer,
                        const EGLint *attribs)
{
  CoglDisplayEGL *egl_display = ctx->display->winsys;
  CoglRendererEGL *egl_renderer = ctx->display->renderer->winsys;
  EGLContext egl_ctx;

  _COGL_RETURN_VAL_IF_FAIL (egl_renderer->pf_eglCreateImage, EGL_NO_IMAGE_KHR);

  /* The EGL_KHR_image_pixmap spec explicitly states that EGL_NO_CONTEXT must
   * always be used in conjunction with the EGL_NATIVE_PIXMAP_KHR target */
#ifdef EGL_KHR_image_pixmap
  if (target == EGL_NATIVE_PIXMAP_KHR)
    egl_ctx = EGL_NO_CONTEXT;
  else
#endif
    egl_ctx = egl_display->egl_context;

  return egl_renderer->pf_eglCreateImage (egl_renderer->edpy,
                                          egl_ctx,
                                          target,
                                          buffer,
                                          attribs);
}

void
_cogl_egl_destroy_image (CoglContext *ctx,
                         EGLImageKHR image)
{
  CoglRendererEGL *egl_renderer = ctx->display->renderer->winsys;

  _COGL_RETURN_IF_FAIL (egl_renderer->pf_eglDestroyImage);

  egl_renderer->pf_eglDestroyImage (egl_renderer->edpy, image);
}
#endif