Function loadTextureARGBfromfile

engine/src/texture.cpp:86–136

}

std::vector<unsigned char> loadTextureARGBfromfile(const char* filename, int& w,
                                                   int& h)
{
    std::vector<unsigned char> data;
    FILE* file;
    unsigned char header[54];

    const std::string resolvedPath = resolveResourcePath(filename);
    file = fopen(resolvedPath.c_str(), "rb");

    if (file == NULL)
    {
        printf("loadTexture error! %s\n", filename);
        return data;
    }

    fread(header, 1, 54, file);
    w = *(int*)&(header[0x12]);
    h = *(int*)&(header[0x16]);
    int dataOffset = *(int*)&(header[0x0A]);
    short bitsPerPixel = *(short*)&(header[0x1C]);

    if (bitsPerPixel != 32 || w <= 0 || h <= 0)
    {
        fclose(file);
        printf("loadTexture unsupported format! %s\n", filename);
        return data;
    }

    data.resize(w * h * 4);
    fseek(file, dataOffset, SEEK_SET);
    fread(data.data(), w * h * 4, 1, file);

    fclose(file);

    for (int i = 0; i < w * h; ++i)
    {
        int index = i * 4;
        unsigned char A, R, G, B;
        B = data[index];
        G = data[index + 1];
        R = data[index + 2];
        A = data[index + 3];

        data[index] = A;
        data[index + 1] = R;
        data[index + 2] = G;
        data[index + 3] = B;
    }
    return data;
}