axmol/core/renderer/Texture2D.cpp

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Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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/*
 * Support for RGBA_4_4_4_4 and RGBA_5_5_5_1 was copied from:
 * https://devforums.apple.com/message/37855#37855 by a1studmuffin
 */

#include "renderer/Texture2D.h"
#include "platform/Image.h"
#include "platform/GL.h"
#include "base/Utils.h"
#include "platform/Device.h"
#include "base/Config.h"
#include "base/Macros.h"
#include "base/UTF8.h"
#include "base/Configuration.h"
#include "platform/PlatformMacros.h"
#include "base/Director.h"
#include "base/NinePatchImageParser.h"
#include "renderer/backend/Device.h"
#include "renderer/backend/ProgramState.h"
#include "renderer/Shaders.h"
#include "renderer/backend/PixelFormatUtils.h"
#include "renderer/Renderer.h"

#if AX_ENABLE_CACHE_TEXTURE_DATA
#    include "renderer/TextureCache.h"
#endif

NS_AX_BEGIN

// CLASS IMPLEMENTATIONS:

// If the image has alpha, you can create RGBA8 (32-bit) or RGBA4 (16-bit) or RGB5A1 (16-bit)
// Default is: RGBA8888 (32-bit textures)
static backend::PixelFormat g_defaultAlphaPixelFormat = backend::PixelFormat::RGBA8;

Texture2D::Texture2D()
    : _pixelFormat(backend::PixelFormat::NONE)
    , _pixelsWide(0)
    , _pixelsHigh(0)
    , _maxS(0.0)
    , _maxT(0.0)
    , _flags(TextureFlag::ANTIALIAS_ENABLED)
    , _samplerFlags(TextureSamplerFlag::DEFAULT)
    , _ninePatchInfo(nullptr)
    , _valid(true)
{
    backend::TextureDescriptor textureDescriptor;
    textureDescriptor.textureFormat = PixelFormat::NONE;
    _texture = static_cast<backend::Texture2DBackend*>(backend::Device::getInstance()->newTexture(textureDescriptor));
}

Texture2D::~Texture2D()
{
#if AX_ENABLE_CACHE_TEXTURE_DATA
    VolatileTextureMgr::removeTexture(this);
#endif
    AXLOGINFO("deallocing Texture2D: %p - id=%u", this, _name);

    AX_SAFE_DELETE(_ninePatchInfo);

    AX_SAFE_RELEASE(_texture);
    AX_SAFE_RELEASE(_programState);
}

backend::PixelFormat Texture2D::getPixelFormat() const
{
    return _pixelFormat;
}

int Texture2D::getPixelsWide() const
{
    return _pixelsWide;
}

int Texture2D::getPixelsHigh() const
{
    return _pixelsHigh;
}

backend::TextureBackend* Texture2D::getBackendTexture() const
{
    return _texture;
}

Vec2 Texture2D::getContentSize() const
{
    Vec2 ret;
    ret.width  = _contentSize.width / AX_CONTENT_SCALE_FACTOR();
    ret.height = _contentSize.height / AX_CONTENT_SCALE_FACTOR();

    return ret;
}

const Vec2& Texture2D::getContentSizeInPixels()
{
    return _contentSize;
}

float Texture2D::getMaxS() const
{
    return _maxS;
}

void Texture2D::setMaxS(float maxS)
{
    _maxS = maxS;
}

float Texture2D::getMaxT() const
{
    return _maxT;
}

void Texture2D::setMaxT(float maxT)
{
    _maxT = maxT;
}

bool Texture2D::hasPremultipliedAlpha() const
{
    return _flags & TextureFlag::PREMULTIPLIEDALPHA;
}

void Texture2D::setPremultipliedAlpha(bool premultipliedAlpha)
{
    if (premultipliedAlpha)
        _flags |= TextureFlag::PREMULTIPLIEDALPHA;
    else
        _flags &= ~TextureFlag::PREMULTIPLIEDALPHA;
}

bool Texture2D::initWithData(const void* data,
                             ssize_t dataLen,
                             backend::PixelFormat pixelFormat,
                             backend::PixelFormat renderFormat,
                             int pixelsWide,
                             int pixelsHigh,
                             bool preMultipliedAlpha)
{
    AXASSERT(dataLen > 0 && pixelsWide > 0 && pixelsHigh > 0, "Invalid size");

    // if data has no mipmaps, we will consider it has only one mipmap
    MipmapInfo mipmap;
    mipmap.address = (unsigned char*)data;
    mipmap.len     = static_cast<int>(dataLen);
    return initWithMipmaps(&mipmap, 1, pixelFormat, renderFormat, pixelsWide, pixelsHigh, preMultipliedAlpha);
}

bool Texture2D::initWithMipmaps(MipmapInfo* mipmaps,
                                int mipmapsNum,
                                backend::PixelFormat pixelFormat,
                                backend::PixelFormat renderFormat,
                                int pixelsWide,
                                int pixelsHigh,
                                bool preMultipliedAlpha)
{
    // the pixelFormat must be a certain value
    updateWithMipmaps(mipmaps, mipmapsNum, pixelFormat, renderFormat, pixelsWide, pixelsHigh, preMultipliedAlpha);

    return true;
}

bool Texture2D::updateWithImage(Image* image, backend::PixelFormat format, int index)
{
    if (image == nullptr)
    {
        AXLOG("axmol: Texture2D. Can't create Texture. UIImage is nil");
        return false;
    }

    if (this->_filePath.empty())
        this->_filePath = image->getFilePath();

    int imageWidth  = image->getWidth();
    int imageHeight = image->getHeight();

    Configuration* conf = Configuration::getInstance();

    int maxTextureSize = conf->getMaxTextureSize();
    if (imageWidth > maxTextureSize || imageHeight > maxTextureSize)
    {
        AXLOG("axmol: WARNING: Image (%u x %u) is bigger than the supported %u x %u", imageWidth, imageHeight,
              maxTextureSize, maxTextureSize);
        return false;
    }

    unsigned char* tempData               = image->getData();
    // Vec2 imageSize                        = Vec2((float)imageWidth, (float)imageHeight);
    backend::PixelFormat renderFormat     = (PixelFormat::NONE == format) ? image->getPixelFormat() : format;
    backend::PixelFormat imagePixelFormat = image->getPixelFormat();
    size_t tempDataLen                    = image->getDataLen();

#ifdef AX_USE_METAL
    //! override renderFormat, since some render format is not supported by metal
    switch (renderFormat)
    {
#    if (AX_TARGET_PLATFORM != AX_PLATFORM_IOS || TARGET_OS_SIMULATOR)
    // packed 16 bits pixels only available on iOS
    case PixelFormat::RGB565:
    case PixelFormat::RGB5A1:
    case PixelFormat::RGBA4:
#    endif
    case PixelFormat::L8:
    case PixelFormat::LA8:
    case PixelFormat::RGB8:
        // Note: conversion to RGBA8 will happends
        renderFormat = PixelFormat::RGBA8;
        break;
    default:
        break;
    }
#elif defined(AX_USE_GL_CORE_PROFILE)
    // Note: axmol-1.1 deprecated A8, L8, LA8 as renderFormat, preferred R8, RG8
    switch (renderFormat)
    {
    case PixelFormat::A8:
    case PixelFormat::L8:
    case PixelFormat::LA8:
        // Note: conversion to RGBA8 will happends
        renderFormat = PixelFormat::RGBA8;
    }
#endif

    if (image->getNumberOfMipmaps() > 1)
    {
        if (renderFormat != image->getPixelFormat())
        {
            AXLOG("axmol: WARNING: This image has more than 1 mipmaps and we will not convert the data format");
        }

        // pixel format of data is not converted, renderFormat can be different from pixelFormat
        // it will be done later
        updateWithMipmaps(image->getMipmaps(), image->getNumberOfMipmaps(), image->getPixelFormat(), renderFormat, imageHeight, imageWidth, image->hasPremultipliedAlpha(), index);
    }
    else if (image->isCompressed())
    {  // !Only hardware support texture will be compression PixelFormat, otherwise, will convert to RGBA8 duraing image
       // load
        renderFormat = imagePixelFormat;
        updateWithData(tempData, tempDataLen, image->getPixelFormat(), image->getPixelFormat(), imageWidth, imageHeight, image->hasPremultipliedAlpha(), index);
    }
    else
    {
        // after conversion, renderFormat == pixelFormat of data
        updateWithData(tempData, tempDataLen, imagePixelFormat, renderFormat, imageWidth, imageHeight,
                       image->hasPremultipliedAlpha(), index);
    }

    return true;
}

bool Texture2D::updateWithData(const void* data,
                               ssize_t dataLen,
                               backend::PixelFormat pixelFormat,
                               backend::PixelFormat renderFormat,
                               int pixelsWide,
                               int pixelsHigh,
                               bool preMultipliedAlpha,
                               int index)
{
    AXASSERT(dataLen > 0 && pixelsWide > 0 && pixelsHigh > 0, "Invalid size");

    // if data has no mipmaps, we will consider it has only one mipmap
    MipmapInfo mipmap;
    mipmap.address = (unsigned char*)data;
    mipmap.len     = static_cast<int>(dataLen);
    return updateWithMipmaps(&mipmap, 1, pixelFormat, renderFormat, pixelsWide, pixelsHigh, preMultipliedAlpha, index);
}

bool Texture2D::updateWithMipmaps(MipmapInfo* mipmaps,
                                  int mipmapsNum,
                                  backend::PixelFormat pixelFormat,
                                  backend::PixelFormat renderFormat,
                                  int pixelsWide,
                                  int pixelsHigh,
                                  bool preMultipliedAlpha,
                                  int index)
{
    // the pixelFormat must be a certain value
    AXASSERT(pixelFormat != PixelFormat::NONE, "the \"pixelFormat\" param must be a certain value!");
    AXASSERT(pixelsWide > 0 && pixelsHigh > 0, "Invalid size");

    if (mipmapsNum <= 0)
    {
        AXLOG("axmol: WARNING: mipmap number is less than 1");
        return false;
    }

    auto& pfd = backend::PixelFormatUtils::getFormatDescriptor(pixelFormat);
    if (!pfd.bpp)
    {
        AXLOG("axmol: WARNING: unsupported pixelformat: %x", (uint32_t)pixelFormat);
#ifdef AX_USE_METAL
        AXASSERT(false, "pixeformat not found in _pixelFormatInfoTables, register required!");
#endif
        return false;
    }

    bool compressed = backend::PixelFormatUtils::isCompressed(pixelFormat);

    if (compressed && !Configuration::getInstance()->supportsPVRTC() && !Configuration::getInstance()->supportsETC1() &&
        !Configuration::getInstance()->supportsETC2() && !Configuration::getInstance()->supportsS3TC() &&
        !Configuration::getInstance()->supportsASTC() && !Configuration::getInstance()->supportsATITC())
    {
        AXLOG("axmol: WARNING: PVRTC/ETC images are not supported");
        return false;
    }

#if AX_ENABLE_CACHE_TEXTURE_DATA
    VolatileTextureMgr::findVolotileTexture(this);
#endif

    backend::TextureDescriptor textureDescriptor;
    textureDescriptor.width  = pixelsWide;
    textureDescriptor.height = pixelsHigh;

    textureDescriptor.samplerDescriptor.magFilter =
        (_flags & TextureFlag::ANTIALIAS_ENABLED) ? backend::SamplerFilter::LINEAR : backend::SamplerFilter::NEAREST;
    if (mipmapsNum == 1)
    {
        textureDescriptor.samplerDescriptor.minFilter = (_flags & TextureFlag::ANTIALIAS_ENABLED)
                                                            ? backend::SamplerFilter::LINEAR
                                                            : backend::SamplerFilter::NEAREST;
    }
    else
    {
        textureDescriptor.samplerDescriptor.minFilter = (_flags & TextureFlag::ANTIALIAS_ENABLED)
                                                            ? backend::SamplerFilter::LINEAR_MIPMAP_NEAREST
                                                            : backend::SamplerFilter::NEAREST_MIPMAP_NEAREST;
    }

    int width                           = pixelsWide;
    int height                          = pixelsHigh;
    backend::PixelFormat oriPixelFormat = pixelFormat;
    for (int i = 0; i < mipmapsNum; ++i)
    {
        unsigned char* data    = mipmaps[i].address;
        size_t dataLen         = mipmaps[i].len;
        unsigned char* outData = data;
        size_t outDataLen      = dataLen;

        if (renderFormat != oriPixelFormat && !compressed)  // need conversion
        {
            auto convertedFormat = backend::PixelFormatUtils::convertDataToFormat(data, dataLen, oriPixelFormat,
                                                                                  renderFormat, &outData, &outDataLen);
#ifdef AX_USE_METAL
            AXASSERT(convertedFormat == renderFormat, "PixelFormat convert failed!");
#endif
            if (convertedFormat == renderFormat)
                pixelFormat = renderFormat;
        }

        textureDescriptor.textureFormat = pixelFormat;
        AXASSERT(textureDescriptor.textureFormat != backend::PixelFormat::NONE, "PixelFormat should not be NONE");

        if (_texture->getTextureFormat() != textureDescriptor.textureFormat)
            _texture->updateTextureDescriptor(textureDescriptor, index);

        if (compressed)
        {
            _texture->updateCompressedData(data, width, height, dataLen, i, index);
        }
        else
        {
            _texture->updateData(outData, width, height, i, index);
        }

        if (outData && outData != data && outDataLen > 0)
        {
            free(outData);
            outData    = nullptr;
            outDataLen = 0;
        }

        if (i > 0 && (width != height || ccNextPOT(width) != width))
        {
            AXLOG(
                "axmol: Texture2D. WARNING. Mipmap level %u is not squared. Texture won't render correctly. width=%d "
                "!= height=%d",
                i, width, height);
        }

        width  = MAX(width >> 1, 1);
        height = MAX(height >> 1, 1);
    }

    if (index == 0)
    {
        _contentSize = Vec2((float)pixelsWide, (float)pixelsHigh);
        _pixelsWide  = pixelsWide;
        _pixelsHigh  = pixelsHigh;
        _pixelFormat = pixelFormat;
        _maxS        = 1;
        _maxT        = 1;

        setPremultipliedAlpha(preMultipliedAlpha);
    }

    // pitfall: we do merge RGB+A at at dual sampler shader, so must mark as _hasPremultipliedAlpha = true to makesure
    // alpha blend works well.
    if (index > 0)
    {
        setPremultipliedAlpha(Image::isCompressedImageHavePMA(Image::CompressedImagePMAFlag::DUAL_SAMPLER));
        _samplerFlags |= TextureSamplerFlag::DUAL_SAMPLER;
    }

    return true;
}

bool Texture2D::updateWithSubData(void* data, int offsetX, int offsetY, int width, int height, int index)
{
    if (_texture && width > 0 && height > 0)
    {
        uint8_t* textureData = static_cast<uint8_t*>(data);
        _texture->updateSubData(offsetX, offsetY, width, height, 0, textureData, index);
        return true;
    }
    return false;
}

// implementation Texture2D (Image)
bool Texture2D::initWithImage(Image* image)
{
    return initWithImage(image, g_defaultAlphaPixelFormat);
}

bool Texture2D::initWithImage(Image* image, backend::PixelFormat format)
{
    if (image == nullptr)
    {
        AXLOG("axmol: Texture2D. Can't create Texture. UIImage is nil");
        return false;
    }

    this->_filePath = image->getFilePath();

    return updateWithImage(image, format);
}

// implementation Texture2D (Text)
bool Texture2D::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 /* = false */,
                               int overflow /* = 0 */)
{
    FontDefinition tempDef;

    tempDef._shadow._shadowEnabled = false;
    tempDef._stroke._strokeEnabled = false;

    tempDef._fontName      = fontName;
    tempDef._fontSize      = fontSize;
    tempDef._dimensions    = dimensions;
    tempDef._alignment     = hAlignment;
    tempDef._vertAlignment = vAlignment;
    tempDef._fontFillColor = Color3B::WHITE;
    tempDef._enableWrap    = enableWrap;
    tempDef._overflow      = overflow;

    return initWithString(text, tempDef);
}

bool Texture2D::initWithString(std::string_view text, const FontDefinition& textDefinition)
{
    if (text.empty())
        return false;

#if AX_ENABLE_CACHE_TEXTURE_DATA
    // cache the texture data
    VolatileTextureMgr::addStringTexture(this, text, textDefinition);
#endif

    bool ret = false;
    Device::TextAlign align;

    if (TextVAlignment::TOP == textDefinition._vertAlignment)
    {
        align = (TextHAlignment::CENTER == textDefinition._alignment) ? Device::TextAlign::TOP
                : (TextHAlignment::LEFT == textDefinition._alignment) ? Device::TextAlign::TOP_LEFT
                                                                      : Device::TextAlign::TOP_RIGHT;
    }
    else if (TextVAlignment::CENTER == textDefinition._vertAlignment)
    {
        align = (TextHAlignment::CENTER == textDefinition._alignment) ? Device::TextAlign::CENTER
                : (TextHAlignment::LEFT == textDefinition._alignment) ? Device::TextAlign::LEFT
                                                                      : Device::TextAlign::RIGHT;
    }
    else if (TextVAlignment::BOTTOM == textDefinition._vertAlignment)
    {
        align = (TextHAlignment::CENTER == textDefinition._alignment) ? Device::TextAlign::BOTTOM
                : (TextHAlignment::LEFT == textDefinition._alignment) ? Device::TextAlign::BOTTOM_LEFT
                                                                      : Device::TextAlign::BOTTOM_RIGHT;
    }
    else
    {
        AXASSERT(false, "Not supported alignment format!");
        return false;
    }

#if (AX_TARGET_PLATFORM != AX_PLATFORM_ANDROID) && (AX_TARGET_PLATFORM != AX_PLATFORM_IOS)
    AXASSERT(textDefinition._stroke._strokeEnabled == false, "Currently stroke only supported on iOS and Android!");
#endif

    PixelFormat pixelFormat    = g_defaultAlphaPixelFormat;
    unsigned char* outTempData = nullptr;
    size_t outTempDataLen      = 0;

    int imageWidth;
    int imageHeight;
    auto textDef            = textDefinition;
    auto contentScaleFactor = AX_CONTENT_SCALE_FACTOR();
    textDef._fontSize *= contentScaleFactor;
    textDef._dimensions.width *= contentScaleFactor;
    textDef._dimensions.height *= contentScaleFactor;
    textDef._stroke._strokeSize *= contentScaleFactor;
    textDef._shadow._shadowEnabled = false;

    bool hasPremultipliedAlpha;
    Data outData = Device::getTextureDataForText(text, textDef, align, imageWidth, imageHeight, hasPremultipliedAlpha);
    if (outData.isNull())
    {
        return false;
    }

    Vec2 imageSize = Vec2((float)imageWidth, (float)imageHeight);
    pixelFormat =
        backend::PixelFormatUtils::convertDataToFormat(outData.getBytes(), imageWidth * imageHeight * 4,
                                                       PixelFormat::RGBA8, pixelFormat, &outTempData, &outTempDataLen);

    ret = initWithData(outTempData, outTempDataLen, pixelFormat, imageWidth, imageHeight);

    if (outTempData != nullptr && outTempData != outData.getBytes())
    {
        free(outTempData);
    }
    setPremultipliedAlpha(hasPremultipliedAlpha);

    return ret;
}

bool Texture2D::updateTextureDescriptor(const backend::TextureDescriptor& descriptor, bool preMultipliedAlpha)
{
    AX_ASSERT(_texture);

    _texture->updateTextureDescriptor(descriptor);
    _pixelsWide = _contentSize.width = _texture->getWidth();
    _pixelsHigh = _contentSize.height = _texture->getHeight();
    setPremultipliedAlpha(preMultipliedAlpha);

    setRenderTarget(descriptor.textureUsage == TextureUsage::RENDER_TARGET);

    if (_pixelFormat == PixelFormat::NONE)
        _pixelFormat = descriptor.textureFormat;

    return true;
}

void Texture2D::setRenderTarget(bool renderTarget)
{
    if (renderTarget)
        _flags |= TextureFlag::RENDERTARGET;
    else
        _flags &= TextureFlag::RENDERTARGET;
}

bool Texture2D::hasMipmaps() const
{
    return _texture->hasMipmaps();
}

void Texture2D::setAliasTexParameters()
{

    if ((_flags & TextureFlag::ANTIALIAS_ENABLED) == 0)
    {
        return;
    }

    _flags &= ~TextureFlag::ANTIALIAS_ENABLED;

    backend::SamplerDescriptor descriptor(backend::SamplerFilter::NEAREST,  // magFilter
                                          (_texture->hasMipmaps()) ? backend::SamplerFilter::NEAREST_MIPMAP_NEAREST
                                                                   : backend::SamplerFilter::NEAREST,  // minFilter
                                          backend::SamplerAddressMode::DONT_CARE,                      // sAddressMode
                                          backend::SamplerAddressMode::DONT_CARE                       // tAddressMode
    );
    _texture->updateSamplerDescriptor(descriptor);
}

void Texture2D::setAntiAliasTexParameters()
{

    if (_flags & TextureFlag::ANTIALIAS_ENABLED)
    {
        return;
    }
    _flags |= TextureFlag::ANTIALIAS_ENABLED;

    backend::SamplerDescriptor descriptor(backend::SamplerFilter::LINEAR,  // magFilter
                                          (_texture->hasMipmaps()) ? backend::SamplerFilter::LINEAR_MIPMAP_NEAREST
                                                                   : backend::SamplerFilter::LINEAR,  // minFilter
                                          backend::SamplerAddressMode::DONT_CARE,                     // sAddressMode
                                          backend::SamplerAddressMode::DONT_CARE                      // tAddressMode
    );
    _texture->updateSamplerDescriptor(descriptor);
}

const char* Texture2D::getStringForFormat() const
{
    return backend::PixelFormatUtils::getFormatDescriptor(_pixelFormat).name;
}

//
// Texture options for images that contains alpha
//
// implementation Texture2D (PixelFormat)

void Texture2D::setDefaultAlphaPixelFormat(backend::PixelFormat format)
{
    g_defaultAlphaPixelFormat = format;
}

backend::PixelFormat Texture2D::getDefaultAlphaPixelFormat()
{
    return g_defaultAlphaPixelFormat;
}

unsigned int Texture2D::getBitsPerPixelForFormat(backend::PixelFormat format) const
{
    return backend::PixelFormatUtils::getFormatDescriptor(format).bpp;
}

unsigned int Texture2D::getBitsPerPixelForFormat() const
{
    return getBitsPerPixelForFormat(_pixelFormat);
}

void Texture2D::addSpriteFrameCapInset(SpriteFrame* spritframe, const Rect& capInsets)
{
    if (nullptr == _ninePatchInfo)
    {
        _ninePatchInfo = new NinePatchInfo;
    }
    if (nullptr == spritframe)
    {
        _ninePatchInfo->capInsetSize = capInsets;
    }
    else
    {
        _ninePatchInfo->capInsetMap[spritframe] = capInsets;
    }
}

bool Texture2D::isContain9PatchInfo() const
{
    return nullptr != _ninePatchInfo;
}

const Rect& Texture2D::getSpriteFrameCapInset(ax::SpriteFrame* spriteFrame) const
{
    AXASSERT(_ninePatchInfo != nullptr,
             "Can't get the sprite frame capInset when the texture contains no 9-patch info.");
    if (nullptr == spriteFrame)
    {
        return this->_ninePatchInfo->capInsetSize;
    }
    else
    {
        auto& capInsetMap = this->_ninePatchInfo->capInsetMap;
        if (capInsetMap.find(spriteFrame) != capInsetMap.end())
        {
            return capInsetMap.at(spriteFrame);
        }
        else
        {
            return this->_ninePatchInfo->capInsetSize;
        }
    }
}

void Texture2D::removeSpriteFrameCapInset(SpriteFrame* spriteFrame)
{
    if (nullptr != this->_ninePatchInfo)
    {
        auto capInsetMap = this->_ninePatchInfo->capInsetMap;
        if (capInsetMap.find(spriteFrame) != capInsetMap.end())
        {
            capInsetMap.erase(spriteFrame);
        }
    }
}

void Texture2D::setTexParameters(const Texture2D::TexParams& desc)
{
    _texture->updateSamplerDescriptor(desc);
}

void Texture2D::generateMipmap()
{
    AXASSERT(_pixelsWide == ccNextPOT(_pixelsWide) && _pixelsHigh == ccNextPOT(_pixelsHigh),
             "Mipmap texture only works in POT textures");

    _texture->generateMipmaps();
}

void Texture2D::initProgram()
{
    if (_programState != nullptr)
        return;

    auto& pipelineDescriptor = _customCommand.getPipelineDescriptor();
    // create program state
    auto* program      = backend::Program::getBuiltinProgram(backend::ProgramType::POSITION_TEXTURE);
    _programState      = new ax::backend::ProgramState(program);
    _mvpMatrixLocation = _programState->getUniformLocation("u_MVPMatrix");
    _textureLocation   = _programState->getUniformLocation("u_tex0");

    pipelineDescriptor.programState = _programState;

    // create vertex buffer
    _customCommand.setDrawType(CustomCommand::DrawType::ARRAY);
    _customCommand.setPrimitiveType(CustomCommand::PrimitiveType::TRIANGLE_STRIP);
    _customCommand.createVertexBuffer(4 * sizeof(float), 4, CustomCommand::BufferUsage::DYNAMIC);

    // setup blend state
    BlendFunc blendFunc;
    if (hasPremultipliedAlpha())
    {
        blendFunc = BlendFunc::ALPHA_PREMULTIPLIED;
    }
    else
    {
        blendFunc = BlendFunc::ALPHA_NON_PREMULTIPLIED;
    }

    auto& blendDescriptor                = pipelineDescriptor.blendDescriptor;
    blendDescriptor.blendEnabled         = true;
    blendDescriptor.sourceRGBBlendFactor = blendDescriptor.sourceAlphaBlendFactor = blendFunc.src;
    blendDescriptor.destinationRGBBlendFactor = blendDescriptor.destinationAlphaBlendFactor = blendFunc.dst;

    _programState->setTexture(_textureLocation, 0, _texture);
}

void Texture2D::drawAtPoint(const Vec2& point, float globalZOrder)
{
    float width  = (float)_pixelsWide * _maxS;
    float height = (float)_pixelsHigh * _maxT;
    Rect rect    = {point.x, point.y, width, height};
    drawInRect(rect, globalZOrder);
}

void Texture2D::drawInRect(const Rect& rect, float globalZOrder)
{
    initProgram();
    _customCommand.init(globalZOrder);
    auto director          = Director::getInstance();
    const auto& modelView  = director->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
    const auto& projection = director->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);

    Mat4 matrixMVP = projection * modelView;

    float vertexData[] = {rect.origin.x,
                          rect.origin.y,
                          0.0f,
                          _maxT,
                          rect.size.width + rect.origin.x,
                          rect.origin.y,
                          _maxS,
                          _maxT,
                          rect.origin.x,
                          rect.size.height + rect.origin.y,
                          0.0f,
                          0.0f,
                          rect.size.width + rect.origin.x,
                          rect.size.height + rect.origin.y,
                          _maxS,
                          0.0f};

    _programState->setUniform(_mvpMatrixLocation, matrixMVP.m, sizeof(matrixMVP.m));
    _customCommand.updateVertexBuffer(vertexData, sizeof(vertexData));
    Director::getInstance()->getRenderer()->addCommand(&_customCommand);
}

NS_AX_END