/*
 * GStreamer
 * Copyright (C) 2015 Matthew Waters <matthew@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.
 */

#ifndef _GST_GL_FORMAT_H_
#define _GST_GL_FORMAT_H_

#include <gst/gst.h>

#include <gst/gl/gstgl_fwd.h>
#include <gst/video/video.h>

/**
 * GST_GL_TEXTURE_TARGET_2D_STR:
 *
 * String used for %GST_GL_TEXTURE_TARGET_2D in things like caps values
 */
#define GST_GL_TEXTURE_TARGET_2D_STR "2D"

/**
 * GST_GL_TEXTURE_TARGET_RECTANGLE_STR:
 *
 * String used for %GST_GL_TEXTURE_TARGET_RECTANGLE in things like caps values
 */
#define GST_GL_TEXTURE_TARGET_RECTANGLE_STR "rectangle"

/**
 * GST_GL_TEXTURE_TARGET_EXTERNAL_OES_STR:
 *
 * String used for %GST_GL_TEXTURE_TARGET_EXTERNAL_OES in things like caps values
 */
#define GST_GL_TEXTURE_TARGET_EXTERNAL_OES_STR "external-oes"

/**
 * GST_BUFFER_POOL_OPTION_GL_TEXTURE_TARGET_2D:
 *
 * String used for %GST_GL_TEXTURE_TARGET_2D as a #GstBufferPool pool option
 */
#define GST_BUFFER_POOL_OPTION_GL_TEXTURE_TARGET_2D "GstBufferPoolOptionGLTextureTarget2D"

/**
 * GST_BUFFER_POOL_OPTION_GL_TEXTURE_TARGET_RECTANGLE:
 *
 * String used for %GST_GL_TEXTURE_TARGET_RECTANGLE as a #GstBufferPool pool option
 */
#define GST_BUFFER_POOL_OPTION_GL_TEXTURE_TARGET_RECTANGLE "GstBufferPoolOptionGLTextureTargetRectangle"

/**
 * GST_BUFFER_POOL_OPTION_GL_TEXTURE_TARGET_EXTERNAL_OES:
 *
 * String used for %GST_GL_TEXTURE_TARGET_EXTERNAL_OES as a #GstBufferPool pool option
 */
#define GST_BUFFER_POOL_OPTION_GL_TEXTURE_TARGET_EXTERNAL_OES "GstBufferPoolOptionGLTextureTargetExternalOES"

G_BEGIN_DECLS

/**
 * GstGLFormat:
 * @GST_GL_LUMINANCE: Single component replicated across R, G, and B textures
 *                    components
 * @GST_GL_ALPHA: Single component stored in the A texture component
 * @GST_GL_LUMINANCE_ALPHA: Combination of #GST_GL_LUMINANCE and #GST_GL_ALPHA
 * @GST_GL_RED: Single component stored in the R texture component
 * @GST_GL_R8: Single 8-bit component stored in the R texture component
 * @GST_GL_RG: Two components stored in the R and G texture components
 * @GST_GL_RG8: Two 8-bit components stored in the R and G texture components
 * @GST_GL_RGB: Three components stored in the R, G, and B texture components
 * @GST_GL_RGB8: Three 8-bit components stored in the R, G, and B
 *               texture components
 * @GST_GL_RGB565: Three components of bit depth 5, 6 and 5 stored in the R, G,
 *                 and B texture components respectively.
 * @GST_GL_RGB16: Three 16-bit components stored in the R, G, and B
 *               texture components
 * @GST_GL_RGBA: Four components stored in the R, G, B, and A texture
 *               components respectively.
 * @GST_GL_RGBA8: Four 8-bit components stored in the R, G, B, and A texture
 *                components respectively.
 * @GST_GL_RGBA16: Four 16-bit components stored in the R, G, B, and A texture
 *                components respectively.
 * @GST_GL_DEPTH_COMPONENT16: A single 16-bit component for depth information.
 * @GST_GL_DEPTH24_STENCIL8: A 24-bit component for depth information and
 *                           a 8-bit component for stencil informat.
 * @GST_GL_RGBA10_A2: Four components of bit depth 10, 10, 10 and 2 stored in the
 *                    R, G, B and A texture components respectively.
 * @GST_GL_R16: Single 16-bit component stored in the R texture component
 * @GST_GL_RG16: Two 16-bit components stored in the R and G texture components
 */
typedef enum
{
  /* values taken from the GL headers */
  GST_GL_LUMINANCE                      = 0x1909,

  GST_GL_ALPHA                          = 0x1906,

  GST_GL_LUMINANCE_ALPHA                = 0x190A,

  GST_GL_RED                            = 0x1903,
  GST_GL_R8                             = 0x8229,

  GST_GL_RG                             = 0x8227,
  GST_GL_RG8                            = 0x822B,

  GST_GL_RGB                            = 0x1907,
  GST_GL_RGB8                           = 0x8051,
  GST_GL_RGB565                         = 0x8D62,
  GST_GL_RGB16                          = 0x8054,

  GST_GL_RGBA                           = 0x1908,
  GST_GL_RGBA8                          = 0x8058,
  GST_GL_RGBA16                         = 0x805B,

  GST_GL_DEPTH_COMPONENT16              = 0x81A5,

  GST_GL_DEPTH24_STENCIL8               = 0x88F0,

  GST_GL_RGB10_A2                       = 0x8059,

  GST_GL_R16                            = 0x822A,
  GST_GL_RG16                           = 0x822C,
} GstGLFormat;

GST_GL_API
guint                   gst_gl_format_type_n_bytes                  (guint format,
                                                                     guint type);
GST_GL_API
GstGLFormat             gst_gl_format_from_video_info               (GstGLContext * context,
                                                                     const GstVideoInfo * vinfo,
                                                                     guint plane);
GST_GL_API
guint                   gst_gl_sized_gl_format_from_gl_format_type  (GstGLContext * context,
                                                                     guint format,
                                                                     guint type);
GST_GL_API
void                    gst_gl_format_type_from_sized_gl_format     (GstGLFormat format,
                                                                     GstGLFormat * unsized_format,
                                                                     guint * gl_type);

GST_GL_API
gboolean                gst_gl_video_format_swizzle                 (GstVideoFormat video_format,
                                                                     int * swizzle);

GST_GL_API
gboolean                gst_gl_format_is_supported                  (GstGLContext * context,
                                                                     GstGLFormat format);
GST_GL_API
guint                   gst_gl_format_n_components                  (GstGLFormat gl_format);
GST_GL_API
void                    gst_gl_swizzle_invert                       (gint * swizzle,
                                                                     gint * inversion);

GST_GL_API
GstGLTextureTarget      gst_gl_texture_target_from_string           (const gchar * str);
GST_GL_API
const gchar *           gst_gl_texture_target_to_string             (GstGLTextureTarget target);
GST_GL_API
guint                   gst_gl_texture_target_to_gl                 (GstGLTextureTarget target);
GST_GL_API
GstGLTextureTarget      gst_gl_texture_target_from_gl               (guint target);
GST_GL_API
const gchar *           gst_gl_texture_target_to_buffer_pool_option (GstGLTextureTarget target);

G_END_DECLS

#endif /* _GST_GL_FORMAT_H_ */
