DonNews #17 30 апреля 2002

Программирование

Coding - the combination of visual effects with digital music.

                                          (C) 2oo2 Disabler / 
DPL 



  Today we talk about such a matter as digital music. All
music is divided into semplovuyu and trekernuyu.Klassichesky 
example semplovoy music -. wav-files. Unfortunately fixed 
effects under semplovuyu muse is quite difficult. By this, we 
consider trekernuyu music and writing rules for the effects of 
it. I think that we should not talk about what digitalka + 
static picture - It is primitive!



              All effects can be divided into three groups:


  1.Effekt called once per time unit (the output of the 
animation or text, blinking screen under the "shock troops").


  2.Vyvod effect occurs in conjunction with 
proigryvaniem.Naprimer, losing the 1000-byte samples, we derive 
the 16 letters and so on. As a result, at a frequency of 8kHz 
(ie 8kb/sekundu) with four channels obtain 8 * 4 = 32, 32 * 16 
= 512 characters per second, which is two-thirds screen, which 
is not too bad! 

  3.Effekt obtained by using the player itself! For
example, we can see intro to DonNews # 15. This effect is very 
attractive and yet does not require CPU time and not vliaet for 
sampling samples. 

 Thus, the basic requirement of the first two groups: the 
minimum Execution time! This is especially true of the second 
group. 

 Let us consider in more detail the last group of effects. We 
have four variables: ram_a, ram_b, ram_c and ram_d, each of 
which points out what a memory page is selected the next 
sample. At the zero-screen is the main text (graphics), and the 
first wallpaper (the one that will shine through main picture). 
If when you play we will always take the value of ram_a and do 
or # 08 (first screen), the ratio of zero to the first screen 
is 3:1, ie three units Zero screen has one unit of the first. 
Similarly, you can add and other variables. As a result, we 
16ti to obtain radiographic grades through the first screen is 
zero. If this is all combined with the strikers - to get the 
effect of intro to DN # 15. I hope you have gone all the 
questions. If not - please email edition marked "Disabler'u. 



          That's it! Wait for the next essay ...