axmol/cocos/3d/CCSkybox.h

/****************************************************************************
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 
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 all copies or substantial portions of the Software.
 
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#ifndef __SKYBOX_H__
#define __SKYBOX_H__

#include "base/ccTypes.h"
#include "platform/CCPlatformMacros.h"
#include "renderer/CCCustomCommand.h"
#include "renderer/CCCallbackCommand.h"
#include "2d/CCNode.h"
#include "renderer/backend/ProgramState.h"

NS_CC_BEGIN

/**
 * @addtogroup _3d
 * @{
 */

class TextureCube;

/**
* Sky box technology is usually used to simulate infinity sky, mountains and other phenomena.
*/
class CC_DLL Skybox : public Node
{
public:
    CREATE_FUNC(Skybox);
    
    /** create skybox from 6 textures.
     @param positive_x texture for the right side of the texture cube face.
     @param negative_x texture for the left side of the texture cube face.
     @param positive_y texture for the top side of the texture cube face
     @param negative_y texture for the bottom side of the texture cube face
     @param positive_z texture for the forward side of the texture cube face.
     @param negative_z texture for the rear side of the texture cube face.
     @return  A new skybox inited with given parameters.
     */
    static Skybox* create(const std::string& positive_x, const std::string& negative_x,
                               const std::string& positive_y, const std::string& negative_y,
                               const std::string& positive_z, const std::string& negative_z);

    /**texture getter and setter*/
    void setTexture(TextureCube*);

    /** draw Skybox object */
    virtual void draw(Renderer* renderer, const Mat4& transform, uint32_t flags) override;

    /** reload sky box after GLESContext reconstructed.*/
    void reload();

CC_CONSTRUCTOR_ACCESS:
    /**
    * Constructor.
    */
    Skybox();

    /**
    * Destructor.
    */
    virtual ~Skybox();

    /**
    * init Skybox.
    */
    virtual bool init() override;
    
    /**
     * initialize with texture path
     */
    bool init(const std::string& positive_x, const std::string& negative_x,
              const std::string& positive_y, const std::string& negative_y,
              const std::string& positive_z, const std::string& negative_z);

protected:

    /**
    * init internal buffers for Skybox.
    */
    void initBuffers();
    
    backend::ProgramState *_programState = nullptr;
    CustomCommand _customCommand;
    CallbackCommand _beforeCommand;
    CallbackCommand _afterCommand;

    TextureCube*  _texture;
private:
    CC_DISALLOW_COPY_AND_ASSIGN(Skybox);

    backend::UniformLocation _uniformColorLoc;
    backend::UniformLocation _uniformCameraRotLoc;
    backend::UniformLocation _uniformEnvLoc;

    void onBeforeDraw();
    void onAfterDraw();

    bool _rendererDepthTestEnabled;
    backend::CompareFunction _rendererDepthCmpFunc;
    backend::CullMode _rendererCullMode;
};

// end of 3d group
/// @}

NS_CC_END

#endif // __SKYBOX_H__