/* gsknglattachmentstateprivate.h
 *
 * Copyright 2020 Christian Hergert <chergert@redhat.com>
 *
 * This file 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 file 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 General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

#ifndef __GSK_NGL_ATTACHMENT_STATE_PRIVATE_H__
#define __GSK_NGL_ATTACHMENT_STATE_PRIVATE_H__

#include "gskngltypesprivate.h"

G_BEGIN_DECLS

typedef struct _GskNglAttachmentState GskNglAttachmentState;
typedef struct _GskNglBindFramebuffer GskNglBindFramebuffer;
typedef struct _GskNglBindTexture     GskNglBindTexture;

struct _GskNglBindTexture
{
  guint changed : 1;
  guint initial : 1;
  GLenum target : 30;
  GLenum texture;
  guint id;
};

G_STATIC_ASSERT (sizeof (GskNglBindTexture) == 12);

struct _GskNglBindFramebuffer
{
  guint changed : 1;
  guint id : 31;
};

G_STATIC_ASSERT (sizeof (GskNglBindFramebuffer) == 4);

struct _GskNglAttachmentState
{
  GskNglBindFramebuffer fbo;
  /* Increase if shaders add more textures */
  GskNglBindTexture textures[4];
  guint n_changed;
};

GskNglAttachmentState *gsk_ngl_attachment_state_new              (void);
GskNglAttachmentState *gsk_ngl_attachment_state_ref              (GskNglAttachmentState *self);
void                   gsk_ngl_attachment_state_unref            (GskNglAttachmentState *self);
void                   gsk_ngl_attachment_state_bind_texture     (GskNglAttachmentState *self,
                                                                  GLenum                 target,
                                                                  GLenum                 texture,
                                                                  guint                  id);
void                   gsk_ngl_attachment_state_bind_framebuffer (GskNglAttachmentState *self,
                                                                  guint                  id);

G_END_DECLS

#endif /* __GSK_NGL_ATTACHMENT_STATE_PRIVATE_H__ */