C++ 如何在 OSX 下的 SDL/OpenGL 应用程序中加载 JPG/PNG 纹理
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How to load JPG/PNG Textures in an SDL/OpenGL App under OSX
提问by Patrick Oscity
i am writing an SDL / OpenGL application that runs under OSX. I have to use existing code which uses the DevIL library for loading JPG and PNG textures. Unfortunately, this works very bad under OS X, so i decided not to use DevIL at all, and rewrite the respective parts of the application using another library. I want to keep it flexible (DevIL can handle a lot of image formats) and easy to use. Is there a good replacement for DevIL that you can recommend? The application is entirely written in C++.
我正在编写一个在 OSX 下运行的 SDL/OpenGL 应用程序。我必须使用使用 DevIL 库的现有代码来加载 JPG 和 PNG 纹理。不幸的是，这在 OS X 下工作得非常糟糕，所以我决定根本不使用 DevIL，并使用另一个库重写应用程序的各个部分。我想保持它的灵活性（DevIL 可以处理很多图像格式）并且易于使用。是否有可以推荐的 DevIL 的良好替代品？该应用程序完全用 C++ 编写。
回答by lx.
Have a look at the SDL_imagelibrary. It offers functions like IMG_LoadPNGthat load your picture "as an" SDL_Surface.
Since you already work with SDL this should fit quite well in your program.
看看SDL_image库。它提供的功能类似于IMG_LoadPNG将您的图片“作为”SDL_Surface 加载。由于您已经使用 SDL，这应该非常适合您的程序。
Sample taken from the SDL_image documentation:
从SDL_image 文档中获取的示例：
// Load sample.png into image
SDL_Surface* image = IMG_Load("sample.png");
if (image == nullptr) {
std::cout << "IMG_Load: " << IMG_GetError() << "\n";
}
回答by uggwar
Take a look at freeimage. It supports all major formats and is easily built with macports. Nice to work with as well. Auto-detects image format etc.
看看freeimage。它支持所有主要格式，并且可以使用 macports 轻松构建。也很高兴与他们合作。自动检测图像格式等。
FREE_IMAGE_FORMAT format = FreeImage_GetFileType(filename.c_str(), 0);
FIBITMAP *bitmap = FreeImage_Load(format, filename.c_str());
if (!bitmap)
{
LOG_ERROR("Unable to load texture: " + filename);
return false;
}
mlWidth = FreeImage_GetWidth(bitmap);
mlHeight = FreeImage_GetHeight(bitmap);
glGenTextures(1, &mpTextures[0]);
glBindTexture(GL_TEXTURE_2D, mpTextures[0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, mlWidth, mlHeight, 0, GL_BGRA, GL_UNSIGNED_BYTE,
(GLvoid*)FreeImage_GetBits(bitmap));
FreeImage_Unload(bitmap);
回答by Chris Becke
If you're on Mac OS anyway, why not just use CGImageSourceto do the loading? OS X natively supports loading many file formats including PNG and JPEG.
如果您使用的是 Mac OS，为什么不直接使用CGImageSource进行加载呢？OS X 本身支持加载许多文件格式，包括 PNG 和 JPEG。
