Jimmy Johnson wrote:
> Is there a better way than the for loop to initialize this 2d array?
>
> buffer = new double* [width];
> for (i = 0; i < width; i++) {
> buffer [i] = new double [height];
> };
> // Set z-buffer to background
> for (i = 0; i < width; i++) {
> for (j = 0; j < height; j++) {
> buffer[i][j] = -10000; // smallest();
> };
> };
>
> It seems to be pretty slow.
>
> Thanks,
>
> Jimmy J. Johnson
Yes. One (or two) allocation(s) instead of many smaller ones. Since
you know exactly how many elements you need, a single allocation can be
done. Even if you did NOT know how many elements to allocate, it is
almost always faster to precalculate how many elements, allocate the
amount of memory needed, and then perform the actual manipulation of the
memory.
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