Function LoadTextureFromFile

src/celengine/texture.cpp:1031–1064

Texture* LoadTextureFromFile(const string& filename,
                             Texture::AddressMode addressMode,
                             Texture::MipMapMode mipMode)
{
    // Check for a Celestia texture--these need to be handled specially.
    ContentType contentType = DetermineFileType(filename);

    if (contentType == Content_CelestiaTexture)
        return LoadVirtualTexture(filename);

    // All other texture types are handled by first loading an image, then
    // creating a texture from that image.
    Image* img = LoadImageFromFile(filename);
    if (img == NULL)
        return NULL;

    Texture* tex = CreateTextureFromImage(*img, addressMode, mipMode);

    if (contentType == Content_DXT5NormalMap)
    {
        // If the texture came from a .dxt5nm file then mark it as a dxt5
        // compressed normal map. There's no separate OpenGL format for dxt5
        // normal maps, so the file extension is the only thing that
        // distinguishes it from a plain old dxt5 texture.
        if (img->getFormat() == GL_COMPRESSED_RGBA_S3TC_DXT5_EXT)
        {
            tex->setFormatOptions(Texture::DXT5NormalMap);
        }
    }

    delete img;

    return tex;
}


// Load a height map texture from a file and convert it to a normal map.