将 uint8_t* 传递给 void* 参数函数时丢失数据？

问题描述

我编写这个函数是为了在 OpenGL 中生成纹理。它正确生成了我想要的纹理，这是一个木箱。

// This works
bool GenerateTextureFromFile(const int32_t mipMapLevel)
{
    int32_t width,height,channels;

    uint8_t* data = stbi_load(mProps.mPath.c_str(),&width,&height,&channels,0);

    if (!data)
    {
        cout << "Failed to generate texture." << endl;

        return false;
    }

    mProps.mWidth = width;
    mProps.mHeight = height;

    Bind();

    glTexImage2D(GL_TEXTURE_2D,mipMapLevel,(uint32_t)mProps.mInternalFormat,mProps.mWidth,mProps.mHeight,(uint32_t)mProps.mImageFormat,mProps.mDataType,data);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,mProps.mWrapS);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,mProps.mWrapT);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,mProps.mFilterMin);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,mProps.mFilterMax);

    if (mipMapLevel)
        glGenerateMipmap(GL_TEXTURE_2D);    

    stbi_image_free(data);

    return true;
}

我想将该功能包装到另一个函数中，但是当我这样做时 glTexImage2D 似乎没有生成正确的纹理。我得到的是黑色纹理而不是木箱，这表明纹理无法生成。从 uint8_t* 转换为 void* 时是否会丢失数据？这样做的最佳方法是什么？

// This fails to generate a texture
void SetDatanew(void* data,TextureProperties props,const int32_t mipMapLevel)
{
    mProps = std::move(props);

    Bind();

    glTexImage2D(GL_TEXTURE_2D,data);

    glTextureParameteri(mObjectID,mProps.mFilterMin);
    glTextureParameteri(mObjectID,mProps.mFilterMax);
    glTextureParameteri(mObjectID,mProps.mWrapS);
    glTextureParameteri(mObjectID,mProps.mWrapT);

    if (mipMapLevel)
        glGenerateMipmap(GL_TEXTURE_2D);
}

bool GenerateTextureFromFile(const int32_t mipMapLevel)
{
    int32_t width,0);

    if (!data)
    {
        cout << "Failed to generate texture." << endl;

        return false;
    }

    mProps.mWidth = width;
    mProps.mHeight = height;

    SetDatanew(data,mProps,mipMapLevel);

    stbi_image_free(data);

    return true;
}

这是我的 TextureProperties 结构：

struct TextureProperties
{
    std::string mPath;
    uint32_t mWidth = 1;
    uint32_t mHeight = 1;
    TextureFormat mInternalFormat = TextureFormat::RGBA;
    TextureFormat mImageFormat = TextureFormat::RGBA;
    uint32_t mDataType = GL_UNSIGNED_BYTE;
    uint32_t mWrapS = GL_REPEAT;
    uint32_t mWrapT = GL_REPEAT;
    uint32_t mFilterMin = GL_LINEAR;
    uint32_t mFilterMax = GL_LINEAR;
};

解决方法

问题是在这里不小心把 objectID 放在了 GL_TEXTURE_2D 中

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