zbuffer.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef BLADERUNNER_ZBUFFER_H
#define BLADERUNNER_ZBUFFER_H

#include "bladerunner/bladerunner.h"

#include "common/rect.h"

namespace BladeRunner {

#define MAX_DIRTY_RECTS 20

class ZBufferDirtyRects {
    int          _count;
    Common::Rect _rects[MAX_DIRTY_RECTS];

public:
    ZBufferDirtyRects() :
        _count(0)
    {}

    void reset();
    bool add(Common::Rect rect);
    void extendExisting();
    int  getCount() const;
    bool popRect(Common::Rect *rect);
};

class ZBuffer {
    int     _width;
    int     _height;

    uint16 *_zbuf1;
    uint16 *_zbuf2;

    ZBufferDirtyRects *_dirtyRects;

    bool _disabled;

public:
    ZBuffer();
    ~ZBuffer();

    void init(int width, int height);
    bool decodeData(const uint8 *data, int size);

    uint16 *getData() const;
    uint16 getZValue(int x, int y) const;

#if !BLADERUNNER_ORIGINAL_BUGS
    void setDataZbufExplicit(int x, int y, uint16 overidingVal);
#endif // BLADERUNNER_ORIGINAL_BUGS

private:
    void blit(Common::Rect rect);

public:
    void mark(Common::Rect rect);
    void clean();
    void resetUpdates();

    // Only called from Scene::resume which is not yet implemented
    void disable();
    void enable();
};

} // End of namespace BladeRunner

#endif