[PATCH 1/3] r600: add span support for 2D tiling

[Matt Turner]

> +static inline GLint r600_log2(GLint n)
> +{
> + ? ? ? GLint log2 = 0;
> +
> + ? ? ? while (n >>= 1)
> + ? ? ? ? ? ? ? ++log2;
> + ? ? ? return log2;
> +}

Does mesa not provide something like this?

Matt