axmol/core/renderer/Texture2D.h

/****************************************************************************
Copyright (c) 2008      Apple Inc. All Rights Reserved.
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

https://axmolengine.github.io/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#pragma once

#include <string>
#include <map>
#include <unordered_map>

#include "base/Ref.h"
#include "math/Math.h"
#include "base/Types.h"
#include "renderer/CustomCommand.h"

NS_AX_BEGIN

class Image;
class NinePatchInfo;
class SpriteFrame;
typedef struct _MipmapInfo MipmapInfo;

namespace ui
{
class Scale9Sprite;
}

namespace backend
{
class Texture2DBackend;
class TextureBackend;
class ProgramState;
}  // namespace backend

/**
 * @addtogroup _2d
 * @{
 */

// CONSTANTS:

// CLASS INTERFACES:

/**
 * @brief Texture2D class. This class allows to easily create OpenGL 2D textures from images, text or raw data.
 * The created Texture2D object will always have power-of-two dimensions.
 * Depending on how you create the Texture2D object, the actual image area of the texture might be smaller than the
 * texture dimensions i.e. "contentSize" != (pixelsWide, pixelsHigh) and (maxS, maxT) != (1.0, 1.0). Be aware that the
 * content of the generated textures will be upside-down!
 */
class AX_DLL Texture2D : public Ref
{
public:
    struct PixelFormatInfo
    {

        PixelFormatInfo(int aBpp, bool aCompressed, bool anAlpha) : bpp(aBpp), compressed(aCompressed), alpha(anAlpha)
        {}

        int bpp;
        bool compressed;
        bool alpha;
    };

    /**
     * Extension to set the Min / Mag filter
     */
    using TexParams = backend::SamplerDescriptor;

public:
    /** sets the default pixel format for UIImagescontains alpha channel.

     @param format
     If the UIImage contains alpha channel, then the options are:
     - generate 32-bit textures: backend::PixelFormat::RGBA8 (default one)
     - generate 24-bit textures: backend::PixelFormat::RGB8
     - generate 16-bit textures: backend::PixelFormat::RGBA4
     - generate 16-bit textures: backend::PixelFormat::RGB5A1
     - generate 16-bit textures: backend::PixelFormat::RGB565
     - generate 8-bit textures: backend::PixelFormat::A8 (only use it if you use just 1 color)

     How does it work ?
     - If the image is an RGBA (with Alpha) then the default pixel format will be used (it can be a 8-bit, 16-bit or
     32-bit texture)
     - If the image is an RGB (without Alpha) then: If the default pixel format is RGBA8888 then a RGBA8888 (32-bit)
     will be used. Otherwise a RGB565 (16-bit texture) will be used.

     This parameter is not valid for PVR / PVR.CCZ images.

     @since v0.8
     */
    static void setDefaultAlphaPixelFormat(backend::PixelFormat format);

    /** Returns the alpha pixel format.
     @since v0.8
     */
    static backend::PixelFormat getDefaultAlphaPixelFormat();

public:
    /**
     * @js ctor
     */
    Texture2D();
    /**
     * @js NA
     * @lua NA
     */
    virtual ~Texture2D();

    /** Initializes with a texture2d with data.

     @param data Specifies a pointer to the image data in memory.
     @param dataLen The image data length.
     @param pixelFormat The image pixelFormat.
     @param pixelsWide The image width.
     @param pixelsHigh The image height.
     @param contentSize The image content size.
     @param preMultipliedAlpha The texture has premultiplied alpha
     * @js NA
     * @lua NA
     */
    bool initWithData(const void* data,
                      ssize_t dataLen,
                      backend::PixelFormat pixelFormat,
                      int pixelsWide,
                      int pixelsHigh,
                      bool preMultipliedAlpha = false)
    {
        return initWithData(data, dataLen, pixelFormat, pixelFormat, pixelsWide, pixelsHigh,
                            preMultipliedAlpha);
    }

    /** Initializes with a texture2d with data.

     @param data Specifies a pointer to the image data in memory.
     @param dataLen The image data length.
     @param pixelFormat The image pixelFormat.
     @param renderFormat The format converted to.
     @param pixelsWide The image width.
     @param pixelsHigh The image height.
     @param contentSize The image content size.
     @param preMultipliedAlpha The texture has premultiplied alpha
     * @js NA
     * @lua NA
     */
    bool initWithData(const void* data,
                      ssize_t dataLen,
                      backend::PixelFormat pixelFormat,
                      backend::PixelFormat renderFormat,
                      int pixelsWide,
                      int pixelsHigh,
                      bool preMultipliedAlpha = false);

    /** Initializes with mipmaps.

     @param mipmaps Specifies a pointer to the image data in memory.
     @param mipmapsNum The mipmaps number.
     @param pixelFormat The image pixelFormat.
     @param pixelsWide The image width.
     @param pixelsHigh The image height.
     @param preMultipliedAlpha The texture has premultiplied alpha
     */
    bool initWithMipmaps(MipmapInfo* mipmaps,
                         int mipmapsNum,
                         backend::PixelFormat pixelFormat,
                         backend::PixelFormat renderFormat,
                         int pixelsWide,
                         int pixelsHigh,
                         bool preMultipliedAlpha = false);

    /** Update with image.

    @param data Specifies a pointer to the image data in memory.
    @param offsetX Specifies a texel offset in the x direction within the texture array.
    @param offsetY Specifies a texel offset in the y direction within the texture array.
    @param width Specifies the width of the texture subimage.
    @param height Specifies the height of the texture subimage.
    */
    bool updateWithImage(Image* image, backend::PixelFormat format, int index = 0);
    bool updateWithData(const void* data,
                        ssize_t dataLen,
                        backend::PixelFormat pixelFormat,
                        backend::PixelFormat renderFormat,
                        int pixelsWide,
                        int pixelsHigh,
                        bool preMultipliedAlpha,
                        int index = 0);
    bool updateWithMipmaps(MipmapInfo* mipmaps,
                           int mipmapsNum,
                           backend::PixelFormat pixelFormat,
                           backend::PixelFormat renderFormat,
                           int pixelsWide,
                           int pixelsHigh,
                           bool preMultipliedAlpha = false,
                           int index               = 0);

    /** Update with texture data.

     @param data Specifies a pointer to the image data in memory.
     @param offsetX Specifies a texel offset in the x direction within the texture array.
     @param offsetY Specifies a texel offset in the y direction within the texture array.
     @param width Specifies the width of the texture subimage.
     @param height Specifies the height of the texture subimage.
     */
    bool updateWithSubData(void* data, int offsetX, int offsetY, int width, int height, int index = 0);
    /**
    Drawing extensions to make it easy to draw basic quads using a Texture2D object.
    These functions require GL_TEXTURE_2D and both GL_VERTEX_ARRAY and GL_TEXTURE_COORD_ARRAY client states to be
    enabled.
    */
    /** Draws a texture at a given point. */
    void drawAtPoint(const Vec2& point, float globalZOrder);
    /** Draws a texture inside a rect.*/
    void drawInRect(const Rect& rect, float globalZOrder);

    /**
    Extensions to make it easy to create a Texture2D object from an image file.
    */
    /**
    Initializes a texture from a UIImage object.

    We will use the format you specified with setDefaultAlphaPixelFormat to convert the image for texture.
    NOTE: It will not convert the pvr image file.
    @param image An UIImage object.
    */
    bool initWithImage(Image* image);

    /**
    Initializes a texture from a UIImage object.

    We will use the format you passed to the function to convert the image format to the texture format.
    If you pass PixelFormat::NONE, we will auto detect the image render type and use that type for texture to render.
    @param image An UIImage object.
    @param format Texture pixel formats.
    **/
    bool initWithImage(Image* image, backend::PixelFormat format);

    /** Initializes a texture from a string with dimensions, alignment, font name and font size.

     @param text A null terminated string.
     @param fontName The font name.
     @param fontSize The font size.
     @param dimensions The font dimension.
     @param hAlignment The font horizontal text alignment type.
     @param vAlignment The font vertical text alignment type.
     @param enableWrap Whether enable text wrap or not.
     @param overflow Whether shrink font size when content larger than the dimensions.
     */
    bool initWithString(std::string_view text,
                        std::string_view fontName,
                        float fontSize,
                        const Vec2& dimensions    = Vec2(0, 0),
                        TextHAlignment hAlignment = TextHAlignment::CENTER,
                        TextVAlignment vAlignment = TextVAlignment::TOP,
                        bool enableWrap           = true,
                        int overflow              = 0);

    /** Initializes a texture from a string using a text definition.

     @param text A null terminated string.
     @param textDefinition A FontDefinition object contains font attributes.
     */
    bool initWithString(std::string_view text, const FontDefinition& textDefinition);

    //!!Used for render buffer, such depth stencil attachment
    bool updateTextureDescriptor(const backend::TextureDescriptor& descriptor, bool preMultipliedAlpha = false);

    void setRenderTarget(bool renderTarget);
    inline bool isRenderTarget() const { return _flags & TextureFlag::RENDERTARGET; }

    void setTexParameters(const TexParams& params);

    /** Generates mipmap images for the texture.
     It only works if the texture size is POT (power of 2).
     @since v0.99.0
     */
    void generateMipmap();

    /** Sets antialias texture parameters:
     - GL_TEXTURE_MIN_FILTER = GL_LINEAR
     - GL_TEXTURE_MAG_FILTER = GL_LINEAR

     @warning Calling this method could allocate additional texture memory.

     @since v0.8
     */
    void setAntiAliasTexParameters();

    /** Sets alias texture parameters:
    - GL_TEXTURE_MIN_FILTER = GL_NEAREST
    - GL_TEXTURE_MAG_FILTER = GL_NEAREST

    @warning Calling this method could allocate additional texture memory.

    @since v0.8
    */
    void setAliasTexParameters();

    /** Returns the pixel format.
     @since v2.0
     */
    const char* getStringForFormat() const;

    /** Returns the bits-per-pixel of the in-memory OpenGL texture
    @since v1.0
    */
    unsigned int getBitsPerPixelForFormat() const;

    /** Helper functions that returns bits per pixels for a given format.
     @since v2.0
     */
    unsigned int getBitsPerPixelForFormat(backend::PixelFormat format) const;

    /** Get content size. */
    const Vec2& getContentSizeInPixels();

    /** Whether or not the texture has their Alpha premultiplied. */
    bool hasPremultipliedAlpha() const;
    void setPremultipliedAlpha(bool premultipliedAlpha);

    /** Whether or not the texture has mip maps.*/
    bool hasMipmaps() const;

    /** Gets the pixel format of the texture. */
    backend::PixelFormat getPixelFormat() const;

    int getSamplerFlags() const { return _samplerFlags; }

    /** Gets the width of the texture in pixels. */
    int getPixelsWide() const;

    /** Gets the height of the texture in pixels. */
    int getPixelsHigh() const;

    backend::TextureBackend* getBackendTexture() const;

    /** Gets max S. */
    float getMaxS() const;
    /** Sets max S. */
    void setMaxS(float maxS);

    /** Gets max T. */
    float getMaxT() const;
    /** Sets max T. */
    void setMaxT(float maxT);

    /** Get the texture content size.*/
    Vec2 getContentSize() const;

    std::string getPath() const { return _filePath; }

private:
    /**
     * A struct for storing 9-patch image capInsets.
     */

    class NinePatchInfo
    {
    public:
        Rect capInsetSize;
        std::unordered_map<SpriteFrame*, Rect> capInsetMap;
    };

    /**
     * Whether the texture contains a 9-patch capInset info or not.
     *
     * @return True is Texture contains a 9-patch info, false otherwise.
     */
    bool isContain9PatchInfo() const;

    /**
     * Get spriteFrame capInset, If spriteFrame can't be found in 9-patch info map,
     * then single 9-patch texture capInset will be returned.
     * If the arg is nullptr, the capInset of single 9-patch texture will be returned.
     *
     * @param spriteFrame A SpriteFrame object pointer.
     *
     * @return The capInset of the SpriteFrame object.
     */
    const Rect& getSpriteFrameCapInset(SpriteFrame* spriteFrame) const;
    /**
     * Remove the spriteFrame capInset info when the spriteFrame is removed.
     *
     * @param spriteFrame A SpriteFrame object pointer.
     */
    void removeSpriteFrameCapInset(SpriteFrame* spriteFrame);
    /**
     * Add capInset for sprite atlas.
     * When handling single texture, pass nullptr in the first arg.
     *
     * @param spritframe The sprite frame object.
     * @param capInsets The parsed capInset from a .9 patch image.
     */
    void addSpriteFrameCapInset(SpriteFrame* spritframe, const Rect& capInsets);

    void initProgram();

protected:
    /** pixel format of the texture */
    backend::PixelFormat _pixelFormat;

    /** width in pixels */
    int _pixelsWide;

    /** height in pixels */
    int _pixelsHigh;

    /** texture name */
    backend::Texture2DBackend* _texture;

    /** texture max S */
    float _maxS;

    /** texture max T */
    float _maxT;

    /** content size */
    Vec2 _contentSize;

    uint16_t _flags : 16;
    uint16_t _samplerFlags : 16;

    NinePatchInfo* _ninePatchInfo;
    friend class SpriteFrameCache;
    friend class TextureCache;
    friend class ui::Scale9Sprite;

    bool _valid;
    std::string _filePath;

    backend::ProgramState* _programState = nullptr;
    backend::UniformLocation _mvpMatrixLocation;
    backend::UniformLocation _textureLocation;
    CustomCommand _customCommand;
};

// end of textures group
/// @}

NS_AX_END