Michael Abrash’s Graphics Programming Black Book (Special Edition) [Michael Abrash] on *FREE* shipping on qualifying offers. No one has done . Graphics Programming Black Book Special Edition has 65 ratings and 3 reviews. — Includes everything that master Abrash has ever written about optimizati. Michael Abrash’s classic Graphics Programming Black Book is a compilation of Michael’s writings on assembly language and graphics.
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Well, I think you can guess what happened next.
The upshot of all this nlack simply that the can transfer word-sized data to and from memory at only half the speed of thewhich inevitably causes performance problems when coupled with an Execution Unit that can process word-sized data every bit as quickly as an To upload an avatar photo, first complete your Disqus profile. This moved the costly multibit rotation out of the loop so that it was performed just once, rather than four times.
Not so with the prefetch queue cycle-eater lurking nearby. One effective technique is to minimize access to memory operands, since such accesses compete with instruction fetching for precious memory accesses.
Each timer channel of the can operate in any of six modes. One point of interest is that ZTimerOn disables interrupts. I bought mine here at amazon in “like new” condition, with the CD-ROM, for much less than the original obok of the book. If you wish to time code directly in place in your programs, rather than in the test-bed program of Listing 3. In contrast, Listing 5. Note that Listing 3.
There Ain’t No Such Thing as the Fastest Code
Who on Nov 2, While I agree it’s dated in lot of ways but it is still a great read. An elegant alternative solution is simply:.
The assembly language gook is indeed faster than any of the C versions, as shown in Table 1. Mode X Marks the Latch 1. You might think that the most obvious advantage assembly language has over C is that it allows the use of all forms of instructions and all registers in all ways, whereas C compilers tend to boom a subset of registers and instructions in a limited number of ways.
The result of this mismatch is simple: What was it like working with John Carmack on Quake? You should immediately reboot and set the PS2 equate to 1 if you get erratic or obviously incorrect results with the long-period Zen timer when PS2 is set to 0. Be patient and keep checking.
Since SHR executes in 2 cycles but is 2 bytes long, the prefetch queue should be empty while Listing 4. For all intents and purposes, one of the two instructions runs at no performance cost whatsoever while the overlap exists.
Graphics Programming Black Book Special Edition by Michael Abrash
The latch-and-read method will work on all PC-compatible computers, but may occasionally produce results that are incorrect by 54 ms. And that’s exactly what Abrash is.
The look-up table technique is one such case. Finally, timer 0 is used to drive the system clock. You see, the same bit register can be both base and index on theand can be scaled as the index while being used unchanged as the base.
Truth to tell, I didn’t bool a three-times speedup; around two times was what I had blcak mind. How can you do this?
This blafk is clearly targeted at game developers and serious assembly language programmers, not for the general reader. The strstr function must spend time either checking for the end of the string being searched or determining the length of that string—wasted effort given that we already know exactly how long our search buffer is.
Michael Abrash’s Graphics Programming Black Book, Special Edition
The Game of Life 2. There are four reasons that many programmers would give for not trying to improve on Listing 1.
The rule is not that the arithmetic flags change whenever the CPU performs a calculation; rather, the flags change whenever you execute an arithmetic, logical, or flag control such as CLC to clear the Carry flag instruction. One-tenth of a second!
Timer 0 normally operates in mode 3: The writer is also a legend. Note that I said that an assembly programmer can generate better code than a compiler, not will generate better code. Organize your program so that you can do your processing within each block as fast as you could if there were only one block—which is to say at top speed—and make your blocks as large as possible in order to minimize the overhead associated with going from one block to the next.
Half as many display memory accesses means half as many display memory wait states. Color Modeling in Color Mode 2. Useful code accesses memory frequently and at irregular intervals, and over the long haul DRAM refresh always exacts its price. Bones and Sinew 5. It wasn’t, however, fast enough for me.
The last few chapters of this book are more relevant, and include a series of explorations of some of the technology behind the popular Doom and Quake 3-D games by id Corporation where the author worked. I was a little worried I would need to be a guru to make any sense of this book.
The sword cuts both ways, and good assembly code requires more, not less, forethought and planning than good code written in a high-level language. Code fragments you write yourself can be timed in just the same way.
Instructions with only register operands tend to be shorter in terms of bytes than instructions with memory operands, and when it comes to performance, shorter is usually better.
That may sound ridiculously simple, but, as this chapter makes clear, it turns out to be abrasy challenging task indeed, one that at times verges on black magic.