/*
 * Cogl
 *
 * An object oriented GL/GLES Abstraction/Utility Layer
 *
 * Copyright (C) 2007,2008,2009 Intel Corporation.
 *
 * 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 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, see <http://www.gnu.org/licenses/>.
 *
 *
 */

#ifndef __COGL_SPANS_PRIVATE_H
#define __COGL_SPANS_PRIVATE_H

#include "cogl-object-private.h"
#include "cogl-pipeline-layer-state.h"

typedef struct _CoglSpan
{
  float start;
  float size;
  float waste;
} CoglSpan;

typedef struct _CoglSpanIter
{
  int index;
  const CoglSpan *spans;
  int n_spans;
  const CoglSpan *span;
  float pos;
  float next_pos;
  float origin;
  float cover_start;
  float cover_end;
  float intersect_start;
  float intersect_end;
  CoglBool intersects;
  CoglBool flipped;
  CoglPipelineWrapMode wrap_mode;
  int mirror_direction;
} CoglSpanIter;

void
_cogl_span_iter_update (CoglSpanIter *iter);

void
_cogl_span_iter_begin (CoglSpanIter *iter,
                       const CoglSpan *spans,
                       int n_spans,
                       float normalize_factor,
                       float cover_start,
                       float cover_end,
                       CoglPipelineWrapMode wrap_mode);

void
_cogl_span_iter_next (CoglSpanIter *iter);

CoglBool
_cogl_span_iter_end (CoglSpanIter *iter);

#endif /* __COGL_SPANS_PRIVATE_H */
