India/cocos2d-x/cocos/2d/CCCameraBackgroundBrush.h

/****************************************************************************
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 
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#ifndef _CCCAMERA_BACKGROUND_BRUSH_H__
#define _CCCAMERA_BACKGROUND_BRUSH_H__

#include "base/ccTypes.h"
#include "base/CCRef.h"
#include "3d/CCFrustum.h"
#include "renderer/CCQuadCommand.h"
#include "renderer/CCCustomCommand.h"
#include "renderer/CCFrameBuffer.h"

NS_CC_BEGIN

class CameraBackgroundColorBrush;
class CameraBackgroundDepthBrush;
class CameraBackgroundSkyBoxBrush;

class GLProgramState;
class Camera;

/**
 * Defines a brush to clear the background of camera.
 * There are 4 types of brush. None brush do nothing, Depth brush clear background with given depth, Color brush clear background with given color and depth, Skybox brush clear the background with a skybox. Camera uses depth brush by default.
 */
class CC_DLL CameraBackgroundBrush : public Ref
{
public:
    /**
     * Brush types. There are 4 types of brush. See CameraBackgroundDepthBrush, CameraBackgroundColorBrush, CameraBackgroundSkyBoxBrush for more information.
     */
    enum class BrushType
    {
        NONE, //none brush
        DEPTH, // depth brush. See CameraBackgroundDepthBrush
        COLOR, // color brush. See CameraBackgroundColorBrush
        SKYBOX, // skybox brush. See CameraBackgroundSkyBoxBrush
    };
    
    /**
     * get brush type
     * @return BrushType
     */
    virtual BrushType getBrushType() const { return BrushType::NONE; }
    
    /**
     * Creates a none brush, it does nothing when clear the background
     * @return Created brush.
     */
    static CameraBackgroundBrush* createNoneBrush();
    
    /**
     * Creates a depth brush, which clears depth buffer with a given depth.
     * @param depth Depth used to clear depth buffer
     * @return Created brush
     */
    static CameraBackgroundDepthBrush* createDepthBrush(float depth = 1.f);
    
    /**
     * Creates a color brush
     * @param color Color of brush
     * @param depth Depth used to clear depth buffer
     * @return Created brush
     */
    static CameraBackgroundColorBrush* createColorBrush(const Color4F& color, float depth);
    
    
    /** Creates a Skybox brush with 6 textures.
     @param positive_x texture for the right side of the texture cube face.
     @param negative_x texture for the up 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 brush inited with given parameters.
     */
    static CameraBackgroundSkyBoxBrush* createSkyboxBrush(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);
    /**
     * draw the background
     */
    virtual void drawBackground(Camera* /*camera*/) {}

    virtual bool isValid() { return true; }

CC_CONSTRUCTOR_ACCESS :
    CameraBackgroundBrush();
    virtual ~CameraBackgroundBrush();

    virtual bool init() { return true; }
    
protected:
    GLProgramState* _glProgramState;
};

/**
 * Depth brush clear depth buffer with given depth
 */
class CC_DLL CameraBackgroundDepthBrush : public CameraBackgroundBrush
{
public:
    /**
     * Create a depth brush
     * @param depth Depth used to clear the depth buffer
     * @return Created brush
     */
    static CameraBackgroundDepthBrush* create(float depth);
    
    /**
     * Get brush type. Should be BrushType::DEPTH
     * @return brush type
     */
    virtual BrushType getBrushType() const override { return BrushType::DEPTH; }
    
    /**
     * Draw background
     */
    virtual void drawBackground(Camera* camera) override;
    
    /**
     * Set depth
     * @param depth Depth used to clear depth buffer
     */
    void setDepth(float depth) { _depth = depth; }
    
CC_CONSTRUCTOR_ACCESS:
    CameraBackgroundDepthBrush();
    virtual ~CameraBackgroundDepthBrush();

    virtual bool init() override;
    
protected:
    float _depth;
    
    GLboolean _clearColor;
    
    V3F_C4B_T2F_Quad _quad;
    GLuint      _vao;
    GLuint      _vertexBuffer;
    GLuint      _indexBuffer;
};

/**
 * Color brush clear buffer with given depth and color
 */
class CC_DLL CameraBackgroundColorBrush : public CameraBackgroundDepthBrush
{
public:
    /**
     * Get brush type. Should be BrushType::COLOR
     * @return brush type
     */
    virtual BrushType getBrushType() const override { return BrushType::COLOR; }
    
    /**
     * Create a color brush
     * @param color Color used to clear the color buffer
     * @param depth Depth used to clear the depth buffer
     * @return Created brush
     */
    static CameraBackgroundColorBrush* create(const Color4F& color, float depth);
    
    /**
     * Draw background
     */
    virtual void drawBackground(Camera* camera) override;
    
    /**
     * Set clear color
     * @param color Color used to clear the color buffer
     */
    void setColor(const Color4F& color);
    
CC_CONSTRUCTOR_ACCESS:
    CameraBackgroundColorBrush();
    virtual ~CameraBackgroundColorBrush();

    virtual bool init() override;
    
protected:
    Color4F _color;
};

class TextureCube;
class GLProgramState;
class EventListenerCustom;

/**
 * Skybox brush clear buffer with a skybox
 */
class CC_DLL CameraBackgroundSkyBoxBrush : public CameraBackgroundBrush
{
public:
    /**
     * Get brush type. Should be BrushType::SKYBOX
     * @return brush type
     */
    virtual BrushType getBrushType() const override { return BrushType::SKYBOX; }
    
    /** Creates a Skybox brush with 6 textures.
     @param positive_x texture for the right side of the texture cube face.
     @param negative_x texture for the up 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 brush inited with given parameters.
     */
    static CameraBackgroundSkyBoxBrush* 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);
    
    /** Creates a Skybox brush with 6 textures.
     */
    static CameraBackgroundSkyBoxBrush* create();
    /**
     * Set skybox texture 
     * @param texture Skybox texture
     */
    void setTexture(TextureCube*  texture);
    
    /**
     * Draw background
     */
    virtual void drawBackground(Camera* camera) override;

    bool isActived() const;
    void setActived(bool actived);
    virtual void setTextureValid(bool valid);
    virtual bool isValid()override;

CC_CONSTRUCTOR_ACCESS :
    CameraBackgroundSkyBoxBrush();
    virtual ~CameraBackgroundSkyBoxBrush();
    
    /**
     * init Skybox.
     */
    virtual bool init() override;
    
protected:
    void initBuffer();
    
    GLuint      _vao;
    GLuint      _vertexBuffer;
    GLuint      _indexBuffer;
    
    TextureCube*  _texture;
    
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
    EventListenerCustom* _backToForegroundListener;
#endif

private:
    bool _actived;
    bool _textureValid;
};

NS_CC_END

#endif// _CCCAMERA_BACKGROUND_BRUSH_H__