Inaccurate C++ comment

[red-robby]

The file src/texture.h includes the lines (43-45),

// A fancy C++11 feature. emplace_back constructs the element in place,
// and in this case it uses the new {} list constructor syntax.
mipmap.emplace_back(MipLevel{width, height, pixels});

This comment is misleading. To be constructed in placed, we'd write, mipmap.emplace_back(width, height, pixels). But this isn't possible as MipLevel is an aggregate type. Instead, MipLevel is constructed by the call to MipLevel{...}, which is then passed to MipLevel's implicit move constructor to construct the actual MipLevel element in the vector.

To emphasize that we're not actually constructing the object in place, we should use push_back (and remove the comment):

mipmap.push_back(MipLevel{width, height, pixels});