/* GStreamer
 * Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

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

#include "gstd3d11format.h"
#include "gstd3d11utils.h"
#include "gstd3d11device.h"
#include "gstd3d11memory.h"

#include <string.h>

#ifndef GST_DISABLE_GST_DEBUG
#define GST_CAT_DEFAULT ensure_debug_category()
static GstDebugCategory *
ensure_debug_category (void)
{
  static gsize cat_gonce = 0;

  if (g_once_init_enter (&cat_gonce)) {
    gsize cat_done;

    cat_done = (gsize) _gst_debug_category_new ("d3d11format", 0,
        "d3d11 specific formats");

    g_once_init_leave (&cat_gonce, cat_done);
  }

  return (GstDebugCategory *) cat_gonce;
}
#else
#define ensure_debug_category() /* NOOP */
#endif /* GST_DISABLE_GST_DEBUG */

/**
 * gst_d3d11_dxgi_format_n_planes:
 * @format: a DXGI_FORMAT
 *
 * Returns: the number of planes for @format
 *
 * Since: 1.20
 */
guint
gst_d3d11_dxgi_format_n_planes (DXGI_FORMAT format)
{
  switch (format) {
    case DXGI_FORMAT_B8G8R8A8_UNORM:
    case DXGI_FORMAT_R8G8B8A8_UNORM:
    case DXGI_FORMAT_R10G10B10A2_UNORM:
    case DXGI_FORMAT_AYUV:
    case DXGI_FORMAT_YUY2:
    case DXGI_FORMAT_R8_UNORM:
    case DXGI_FORMAT_R8G8_UNORM:
    case DXGI_FORMAT_R16_UNORM:
    case DXGI_FORMAT_R16G16_UNORM:
    case DXGI_FORMAT_G8R8_G8B8_UNORM:
    case DXGI_FORMAT_R8G8_B8G8_UNORM:
    case DXGI_FORMAT_Y210:
    case DXGI_FORMAT_Y410:
    case DXGI_FORMAT_R16G16B16A16_UNORM:
      return 1;
    case DXGI_FORMAT_NV12:
    case DXGI_FORMAT_P010:
    case DXGI_FORMAT_P016:
      return 2;
    default:
      break;
  }

  return 0;
}

/**
 * gst_d3d11_dxgi_format_get_size:
 * @format: a DXGI_FORMAT
 * @width: a texture width
 * @height: a texture height
 * @pitch: a pitch of texture
 * @offset: offset for each plane
 * @stride: stride for each plane
 * @size: (out): required memory size for given format
 *
 * Calculate required memory size and per plane stride with
 * based on information
 *
 * Returns: %TRUE if @size can be calculated with given information
 *
 * Since: 1.20
 */
gboolean
gst_d3d11_dxgi_format_get_size (DXGI_FORMAT format, guint width, guint height,
    guint pitch, gsize offset[GST_VIDEO_MAX_PLANES],
    gint stride[GST_VIDEO_MAX_PLANES], gsize * size)
{
  g_return_val_if_fail (format != DXGI_FORMAT_UNKNOWN, FALSE);

  switch (format) {
    case DXGI_FORMAT_B8G8R8A8_UNORM:
    case DXGI_FORMAT_R8G8B8A8_UNORM:
    case DXGI_FORMAT_R10G10B10A2_UNORM:
    case DXGI_FORMAT_AYUV:
    case DXGI_FORMAT_YUY2:
    case DXGI_FORMAT_R8_UNORM:
    case DXGI_FORMAT_R8G8_UNORM:
    case DXGI_FORMAT_R16_UNORM:
    case DXGI_FORMAT_R16G16_UNORM:
    case DXGI_FORMAT_G8R8_G8B8_UNORM:
    case DXGI_FORMAT_R8G8_B8G8_UNORM:
    case DXGI_FORMAT_Y210:
    case DXGI_FORMAT_Y410:
    case DXGI_FORMAT_R16G16B16A16_UNORM:
      offset[0] = 0;
      stride[0] = pitch;
      *size = pitch * height;
      break;
    case DXGI_FORMAT_NV12:
    case DXGI_FORMAT_P010:
    case DXGI_FORMAT_P016:
      offset[0] = 0;
      stride[0] = pitch;
      offset[1] = offset[0] + stride[0] * height;
      stride[1] = pitch;
      *size = offset[1] + stride[1] * GST_ROUND_UP_2 (height / 2);
      break;
    default:
      return FALSE;
  }

  GST_LOG ("Calculated buffer size: %" G_GSIZE_FORMAT
      " (dxgi format:%d, %dx%d, Pitch %d)",
      *size, format, width, height, pitch);

  return TRUE;
}

/**
 * gst_d3d11_dxgi_format_to_gst:
 * @format: a DXGI_FORMAT
 *
 * Converts the @format to its #GstVideoFormat representation.
 *
 * Returns: a #GstVideoFormat equivalent to @format
 *
 * Since: 1.20
 */
GstVideoFormat
gst_d3d11_dxgi_format_to_gst (DXGI_FORMAT format)
{
  switch (format) {
    case DXGI_FORMAT_B8G8R8A8_UNORM:
      return GST_VIDEO_FORMAT_BGRA;
    case DXGI_FORMAT_R8G8B8A8_UNORM:
      return GST_VIDEO_FORMAT_RGBA;
    case DXGI_FORMAT_R10G10B10A2_UNORM:
      return GST_VIDEO_FORMAT_RGB10A2_LE;
    case DXGI_FORMAT_AYUV:
      return GST_VIDEO_FORMAT_VUYA;
    case DXGI_FORMAT_YUY2:
      return GST_VIDEO_FORMAT_YUY2;
    case DXGI_FORMAT_Y210:
      return GST_VIDEO_FORMAT_Y210;
    case DXGI_FORMAT_Y410:
      return GST_VIDEO_FORMAT_Y410;
    case DXGI_FORMAT_NV12:
      return GST_VIDEO_FORMAT_NV12;
    case DXGI_FORMAT_P010:
      return GST_VIDEO_FORMAT_P010_10LE;
    case DXGI_FORMAT_P016:
      return GST_VIDEO_FORMAT_P016_LE;
    default:
      break;
  }

  return GST_VIDEO_FORMAT_UNKNOWN;
}