sky/engine/platform/graphics/filters/SpotLightSource.h

/*
 * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
 *
 * 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; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_FILTERS_SPOTLIGHTSOURCE_H_
#define SKY_ENGINE_PLATFORM_GRAPHICS_FILTERS_SPOTLIGHTSOURCE_H_

#include "sky/engine/platform/graphics/filters/LightSource.h"

namespace blink {

class PLATFORM_EXPORT SpotLightSource : public LightSource {
public:
    static PassRefPtr<SpotLightSource> create(const FloatPoint3D& position,
        const FloatPoint3D& direction, float specularExponent, float limitingConeAngle)
    {
        return adoptRef(new SpotLightSource(position, direction, specularExponent, limitingConeAngle));
    }

    virtual PassRefPtr<LightSource> create(const FloatPoint3D& scale, const FloatSize& offset) const override
    {
        FloatPoint3D position(m_position.x() * scale.x() - offset.width(), m_position.y() * scale.y() - offset.height(), m_position.z() * scale.z());
        FloatPoint3D direction(m_direction.x() * scale.x() - offset.width(), m_direction.y() * scale.y() - offset.height(), m_direction.z() * scale.z());
        return adoptRef(new SpotLightSource(position, direction, m_specularExponent, m_limitingConeAngle));
    }

    const FloatPoint3D& position() const { return m_position; }
    const FloatPoint3D& direction() const { return m_direction; }
    float specularExponent() const { return m_specularExponent; }
    float limitingConeAngle() const { return m_limitingConeAngle; }

    virtual bool setPosition(const FloatPoint3D&) override;
    virtual bool setPointsAt(const FloatPoint3D&) override;

    virtual bool setSpecularExponent(float) override;
    virtual bool setLimitingConeAngle(float) override;

    virtual void initPaintingData(PaintingData&) const override;
    virtual void updatePaintingData(PaintingData&, int x, int y, float z) const override;

    virtual TextStream& externalRepresentation(TextStream&) const override;

private:
    SpotLightSource(const FloatPoint3D& position, const FloatPoint3D& direction,
        float specularExponent, float limitingConeAngle)
        : LightSource(LS_SPOT)
        , m_position(position)
        , m_direction(direction)
        , m_specularExponent(std::min(std::max(specularExponent, 1.0f), 128.0f))
        , m_limitingConeAngle(limitingConeAngle)
    {
    }

    FloatPoint3D m_position;
    FloatPoint3D m_direction;

    float m_specularExponent;
    float m_limitingConeAngle;
};

} // namespace blink

#endif  // SKY_ENGINE_PLATFORM_GRAPHICS_FILTERS_SPOTLIGHTSOURCE_H_