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James Gregory 2013-12-30 18:34:31 +11:00
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51-05.md
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@ -3,14 +3,14 @@
------------------------ --------------------------------- --------------------
With the above optimizations, the sample program is certainly adequately
responsive on a 20 MHz 386 (sans 387; I’m sure it’s wonderfully
responsive with a math coprocessor). Still, it couldn’t quite keep up
responsive on a 20 MHz 386 (sans 387; I'm sure it's wonderfully
responsive with a math coprocessor). Still, it couldn't quite keep up
with the keyboard when I modified it to read only one key each time
through the loop—and we’re talking about only eight vertices here. This
indicates that we’re already near the limit of animation complexity
possible with our current approach. It’s time to start rethinking that
through the loop—and we're talking about only eight vertices here. This
indicates that we're already near the limit of animation complexity
possible with our current approach. It's time to start rethinking that
approach; over two-thirds of the overall time is spent in floating-point
calculations, and it’s there that we’ll begin to attack the performance
calculations, and it's there that we'll begin to attack the performance
bottleneck we find ourselves up against.
### Incremental Transformation {#Heading5}
@ -33,14 +33,14 @@ of all the rotations ever specified by the user, concatenated one after
another onto the original matrix. Potential loss of precision is a
problem associated with using such an approach to represent a very long
concatenation of transformations, especially with fixed-point
arithmetic; that’s not a problem for us yet, but we’ll run into it
arithmetic; that's not a problem for us yet, but we'll run into it
eventually.
**LISTING 51.4 L51-4.C**
/* Routines to perform incremental rotations around the three axes */
#include <math.h>
#include “polygon.h”
#include "polygon.h"
/* Concatenate a rotation by Angle around the X axis to the transformation in
XformToChange, placing result back in XformToChange. */