[Mesa-stable] [Mesa-dev] [PATCH] mesa: fix arithmetic error in _mesa_compute_compressed_pixelstore()

[Eric Anholt]

Matt Turner <mattst88 at gmail.com> writes:

> On Mon, Dec 1, 2014 at 12:47 PM, Brian Paul <brianp at vmware.com> wrote:
>> We need parenthesis around the expression which computes the number of
>> blocks per row.
>>
>> Cc: "10.3 10.4" <mesa-stable at lists.freedesktop.org>
>> ---
>>  src/mesa/main/texstore.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
>> index f858cef..50aa1fd 100644
>> --- a/src/mesa/main/texstore.c
>> +++ b/src/mesa/main/texstore.c
>> @@ -2231,7 +2231,7 @@ _mesa_compute_compressed_pixelstore(GLuint dims, mesa_format texFormat,
>>
>>        if (packing->RowLength) {
>>           store->TotalBytesPerRow = packing->CompressedBlockSize *
>> -            (packing->RowLength + bw - 1) / bw;
>> +            ((packing->RowLength + bw - 1) / bw);
>>        }
>
> Could we copy
>
> #define ALIGN_DIVUP(x, y) (((x) + (y) - 1) / (y))
>
> our of r600_pipe.h into src/util/macros.h and use that? Maybe that'd
> be better as a coccinelle patch over the whole tree.

The kernel calls this DIV_ROUND_UP, which I think reads better than
ALIGN_DIVUP.  And I've wanted that macro a bunch of times.
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