/*
 *  gstvaapivideoconverter_glx.c - Gst VA video converter
 *
 *  Copyright (C) 2011-2013 Intel Corporation
 *    Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
 *  Copyright (C) 2011 Collabora Ltd.
 *    Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
 *
 *  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 2.1
 *  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, write to the Free
 *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301 USA
 */

#include "gst/vaapi/sysdeps.h"
#include <gst/vaapi/gstvaapitexture.h>
#include "gstvaapivideoconverter_glx.h"
#include "gstvaapivideoconverter_x11.h"
#include "gstvaapipluginutil.h"
#include "gstvaapivideometa.h"

#if GST_CHECK_VERSION(1,0,0)
typedef gboolean (*GstSurfaceUploadFunction) (GstSurfaceConverter *,
    GstBuffer *);
#else
typedef gboolean (*GstSurfaceUploadFunction) (GstSurfaceConverter *,
    GstSurfaceBuffer *);
#endif

static void
gst_vaapi_video_converter_glx_iface_init (GstSurfaceConverterInterface * iface);

G_DEFINE_TYPE_WITH_CODE (GstVaapiVideoConverterGLX,
    gst_vaapi_video_converter_glx,
    G_TYPE_OBJECT,
    G_IMPLEMENT_INTERFACE (GST_TYPE_SURFACE_CONVERTER,
        gst_vaapi_video_converter_glx_iface_init));

#define GST_VAAPI_VIDEO_CONVERTER_GLX_GET_PRIVATE(obj) \
  (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_VAAPI_TYPE_VIDEO_CONVERTER_GLX, \
      GstVaapiVideoConverterGLXPrivate))

struct _GstVaapiVideoConverterGLXPrivate
{
  GstVaapiTexture *texture;
};

static gboolean
gst_vaapi_video_converter_glx_upload (GstSurfaceConverter * self,
    GstBuffer * buffer);

static void
gst_vaapi_video_converter_glx_dispose (GObject * object)
{
  GstVaapiVideoConverterGLXPrivate *const priv =
      GST_VAAPI_VIDEO_CONVERTER_GLX (object)->priv;

  gst_vaapi_texture_replace (&priv->texture, NULL);

  G_OBJECT_CLASS (gst_vaapi_video_converter_glx_parent_class)->dispose (object);
}

static void
gst_vaapi_video_converter_glx_class_init (GstVaapiVideoConverterGLXClass *
    klass)
{
  GObjectClass *const object_class = G_OBJECT_CLASS (klass);

  g_type_class_add_private (klass, sizeof (GstVaapiVideoConverterGLXPrivate));

  object_class->dispose = gst_vaapi_video_converter_glx_dispose;
}

static void
gst_vaapi_video_converter_glx_init (GstVaapiVideoConverterGLX * buffer)
{
  buffer->priv = GST_VAAPI_VIDEO_CONVERTER_GLX_GET_PRIVATE (buffer);
}

static void
gst_vaapi_video_converter_glx_iface_init (GstSurfaceConverterInterface * iface)
{
  iface->upload = (GstSurfaceUploadFunction)
      gst_vaapi_video_converter_glx_upload;
}

/**
 * gst_vaapi_video_converter_glx_new:
 * @surface: the #GstSurfaceBuffer
 * @type: type of the target buffer (must be "opengl")
 * @dest: target of the conversion (must be GL texture id)
 *
 * Creates an empty #GstBuffer. The caller is responsible for
 * completing the initialization of the buffer with the
 * gst_vaapi_video_converter_glx_set_*() functions.
 *
 * Return value: the newly allocated #GstBuffer, or %NULL on error
 */
GstSurfaceConverter *
gst_vaapi_video_converter_glx_new (GstBuffer * buffer, const gchar * type,
    GValue * dest)
{
  GstVaapiVideoMeta *const meta = gst_buffer_get_vaapi_video_meta (buffer);
  GstVaapiTexture *texture;
  GstVaapiVideoConverterGLX *converter;

  /* Check for "opengl" request, or chain up to X11 converter */
  if (strcmp (type, "opengl") != 0 || !G_VALUE_HOLDS_UINT (dest))
    return gst_vaapi_video_converter_x11_new (buffer, type, dest);

  /* FIXME Should we assume target and format ? */
  texture =
      gst_vaapi_texture_new_with_texture (gst_vaapi_video_meta_get_display
      (meta), g_value_get_uint (dest), GL_TEXTURE_2D, GL_BGRA);
  if (!texture)
    return NULL;

  converter = g_object_new (GST_VAAPI_TYPE_VIDEO_CONVERTER_GLX, NULL);
  converter->priv->texture = texture;
  return GST_SURFACE_CONVERTER (converter);
}

gboolean
gst_vaapi_video_converter_glx_upload (GstSurfaceConverter * self,
    GstBuffer * buffer)
{
  GstVaapiVideoConverterGLXPrivate *const priv =
      GST_VAAPI_VIDEO_CONVERTER_GLX (self)->priv;
  GstVaapiVideoMeta *const meta = gst_buffer_get_vaapi_video_meta (buffer);
  GstVaapiSurface *const surface = gst_vaapi_video_meta_get_surface (meta);
  GstVaapiDisplay *new_dpy, *old_dpy;

  new_dpy = gst_vaapi_object_get_display (GST_VAAPI_OBJECT (surface));
  old_dpy = gst_vaapi_object_get_display (GST_VAAPI_OBJECT (priv->texture));

  if (old_dpy != new_dpy) {
    const guint texture = gst_vaapi_texture_get_id (priv->texture);

    gst_vaapi_texture_replace (&priv->texture, NULL);
    priv->texture = gst_vaapi_texture_new_with_texture (new_dpy,
        texture, GL_TEXTURE_2D, GL_BGRA);
  }

  if (!gst_vaapi_apply_composition (surface, buffer))
    GST_WARNING ("could not update subtitles");

  return gst_vaapi_texture_put_surface (priv->texture, surface,
      gst_vaapi_video_meta_get_render_flags (meta));
}