/*
 *  gstvaapivideometa_texture.c - GStreamer/VA video meta (GLTextureUpload)
 *
 *  Copyright (C) 2010-2011 Splitted-Desktop Systems
 *    Author: Gwenole Beauchesne <gwenole.beauchesne@splitted-desktop.com>
 *  Copyright (C) 2011-2013 Intel Corporation
 *    Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
 *  Copyright (C) 2013 Igalia
 *    Author: Víctor Manuel Jáquez Leal <vjaquez@igalia.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 "gstvaapivideometa.h"
#include "gstvaapivideometa_texture.h"
#include "gstvaapipluginutil.h"

#if GST_CHECK_VERSION(1,1,0) && USE_GLX
struct _GstVaapiVideoMetaTexture {
    GstVaapiTexture *texture;
};

static void
meta_texture_free(GstVaapiVideoMetaTexture *meta)
{
    if (G_UNLIKELY(!meta))
        return;

    gst_vaapi_texture_replace(&meta->texture, NULL);
    g_slice_free(GstVaapiVideoMetaTexture, meta);
}

static GstVaapiVideoMetaTexture *
meta_texture_new(void)
{
    GstVaapiVideoMetaTexture *meta;

    meta = g_slice_new(GstVaapiVideoMetaTexture);
    if (!meta)
        return NULL;

    meta->texture = NULL;
    return meta;
}

static GstVaapiVideoMetaTexture *
meta_texture_copy(GstVaapiVideoMetaTexture *meta)
{
    GstVaapiVideoMetaTexture *copy;

    copy = meta_texture_new();
    if (!copy)
        return NULL;

    gst_vaapi_texture_replace(&copy->texture, meta->texture);
    return copy;
}

static gboolean
gst_vaapi_texture_upload(GstVideoGLTextureUploadMeta *meta, guint texture_id[4])
{
    GstVaapiVideoMeta * const vmeta =
        gst_buffer_get_vaapi_video_meta(meta->buffer);
    GstVaapiVideoMetaTexture * const meta_texture = meta->user_data;
    GstVaapiSurface * const surface = gst_vaapi_video_meta_get_surface(vmeta);
    GstVaapiDisplay * const dpy = GST_VAAPI_OBJECT_DISPLAY(surface);

    if (gst_vaapi_display_get_display_type(dpy) != GST_VAAPI_DISPLAY_TYPE_GLX)
        return FALSE;

    if (!meta_texture->texture ||
        /* Check whether VA display changed */
        GST_VAAPI_OBJECT_DISPLAY(meta_texture->texture) != dpy ||
        /* Check whether texture id changed */
        gst_vaapi_texture_get_id(meta_texture->texture) != texture_id[0]) {
        /* FIXME: should we assume target? */
        GstVaapiTexture * const texture =
            gst_vaapi_texture_new_with_texture(dpy, texture_id[0],
                GL_TEXTURE_2D, GL_RGBA);
        gst_vaapi_texture_replace(&meta_texture->texture, texture);
        if (!texture)
            return FALSE;
        gst_vaapi_texture_unref(texture);
    }
    return gst_vaapi_texture_put_surface(meta_texture->texture, surface,
        gst_vaapi_video_meta_get_render_flags(vmeta));
}

gboolean
gst_buffer_add_texture_upload_meta(GstBuffer *buffer)
{
    GstVideoGLTextureUploadMeta *meta = NULL;
    GstVideoGLTextureType tex_type[] = { GST_VIDEO_GL_TEXTURE_TYPE_RGBA };
    GstVaapiVideoMetaTexture *meta_texture;

    if (!buffer)
        return FALSE;

    meta_texture = meta_texture_new();
    if (!meta_texture)
        return FALSE;

    meta = gst_buffer_add_video_gl_texture_upload_meta(buffer,
        GST_VIDEO_GL_TEXTURE_ORIENTATION_X_NORMAL_Y_NORMAL,
        1, tex_type, gst_vaapi_texture_upload,
        meta_texture, (GBoxedCopyFunc)meta_texture_copy,
        (GBoxedFreeFunc)meta_texture_free);
    if (!meta)
        goto error;
    return TRUE;

error:
    meta_texture_free(meta_texture);
    return FALSE;
}

gboolean
gst_buffer_ensure_texture_upload_meta(GstBuffer *buffer)
{
    return gst_buffer_get_video_gl_texture_upload_meta(buffer) ||
        gst_buffer_add_texture_upload_meta(buffer);
}
#endif