/*
 * texture rectangle
 *
 * A small utility function to help create a rectangle texture
 *
 * Authored By Neil Roberts  <neil@linux.intel.com>
 *
 * Copyright (C) 2011, 2012 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <config.h>

#include <clutter/clutter.h>
#include "meta-texture-rectangle.h"

CoglTexture *
meta_texture_rectangle_new (unsigned int width,
                            unsigned int height,
                            CoglPixelFormat format,
                            CoglPixelFormat internal_format,
                            unsigned int rowstride,
                            const guint8 *data,
                            GError **error)
{
  ClutterBackend *backend =
    clutter_get_default_backend ();
  CoglContext *context =
    clutter_backend_get_cogl_context (backend);
  CoglTextureRectangle *tex_rect;

  tex_rect = cogl_texture_rectangle_new_with_size (context,
                                                   width, height,
                                                   internal_format,
                                                   error);
  if (tex_rect == NULL)
    return NULL;

  if (data)
    cogl_texture_set_region (COGL_TEXTURE (tex_rect),
                             0, 0, /* src_x/y */
                             0, 0, /* dst_x/y */
                             width, height, /* dst_width/height */
                             width, height, /* width/height */
                             format,
                             rowstride,
                             data);

  return COGL_TEXTURE (tex_rect);
}

static void
texture_rectangle_check_cb (CoglTexture *sub_texture,
                            const float *sub_texture_coords,
                            const float *meta_coords,
                            void *user_data)
{
  gboolean *result = user_data;

  if (cogl_is_texture_rectangle (sub_texture))
    *result = TRUE;
}

/* Determines if the given texture is using a rectangle texture as its
 * primitive texture type. Eventually this function could be replaced
 * with cogl_texture_get_type if Cogl makes that public.
 *
 * http://git.gnome.org/browse/cogl/commit/?h=8012eee31
 */
gboolean
meta_texture_rectangle_check (CoglTexture *texture)
{
  gboolean result = FALSE;

  cogl_meta_texture_foreach_in_region (COGL_META_TEXTURE (texture),
                                       0.0f, 0.0f, /* tx_1 / ty_1 */
                                       1.0f, 1.0f, /* tx_2 / ty_2 */
                                       COGL_PIPELINE_WRAP_MODE_REPEAT,
                                       COGL_PIPELINE_WRAP_MODE_REPEAT,
                                       texture_rectangle_check_cb,
                                       &result);

  return result;
}