主题：彩色波浪……讨论一下双缓冲、写屏
SuperGI
[专家分：0] 发布于 2004-09-12 20:48:00
CLS
SCREEN 13
DIM c(16000)
GET (0, 0)-(119, 119), c
DEF SEG = VARSEG(c(0))
FOR r = 1 TO 1000
s = TIMER
FOR i = 1 TO 16000
c(i) = 0
NEXT i
FOR y = 0 TO 119
FOR x = 0 TO 119
cl = CINT(ABS(SIN((y) / 10) * 10 * SIN(r / 20)) + SIN((x) / 10) * 10 * COS(r / 20)) MOD 100& + r MOD 256&
POKE 4 + x + 120& * y, cl
NEXT x
NEXT y
PUT (0, 0), c, PSET
DO WHILE TIMER - s < .01
LOOP
NEXT r
5 楼
SuperGI [专家分：0] 发布于 2004-09-12 20:47:00
下面的这段程序就用了直接硬件输出了，板斧帮我解释一下吧！
DIM oldr%(255), oldg%(255), oldb%(255), A%(300), C%(300)
'
SCREEN 13
'
' Save old palette, set palette to black to
' hide the build process...
'
FOR t% = 0 TO 255
CALL ReadRGB(oldr%(t%), oldg%(t%), oldb%(t%), t%)
CALL WriteRGB(0, 0, 0, t%)
NEXT t%
'
' TPI = 2 x PI - Do NOT mess with, needed for SIN Calcs
' FREQ = Frequency (Duh!) - Go ahead and mess with these two...
' AMPLITUDE = (Double Duh!)
'
TPI = 6.28318: FREQ% = 4: AMPLITUDE% = 15
'
' Create Sinusoidal Multicolored Backdrop Thingy!
'
SCALE = (TPI * FREQ%) / 320
'
FOR Y% = 0 TO 199
RAD = 0
COLR% = COLR% + 1: IF COLR% > 255 THEN COLR% = 1
LINE (0, Y%)-(0, Y%), COLR%
FOR X% = 0 TO 319 STEP 8
YPOS% = Y% + SIN(RAD) * AMPLITUDE%
LINE -(X%, YPOS%), COLR%
RAD = RAD + (SCALE * 6)
NEXT X%
NEXT Y%
'
' Warp it sinusoidally in a horizontal fashion!
'
RAD = 0
FREQ% = 8: AMPLITUDE% = 15
SCALE = (TPI * FREQ%) / 200
'
FOR Y% = 0 TO 199
XPOS% = INT(SIN(RAD) * AMPLITUDE%)
GET (0, Y%)-(319 - XPOS%, Y%), A%
IF XPOS% >= 0 THEN
GET (319 - XPOS%, Y%)-(319, Y%), C%
PUT (XPOS%, Y%), A%, PSET
PUT (0, Y%), C%, PSET
ELSE
GET (ABS(XPOS%), Y%)-(319, Y%), A%
GET (0, Y%)-(ABS(XPOS%), Y%), C%
PUT (0, Y%), A%, PSET
PUT (319 + XPOS%, Y%), C%, PSET
END IF
RAD = RAD + SCALE
NEXT Y%
'
' Mask off ugly portions
'
LINE (0, 0)-(319, 17), 0, BF
LINE (0, 174)-(319, 199), 0, BF
LINE (0, 0)-(35, 199), 0, BF
LINE (289, 0)-(319, 199), 0, BF
'
' Create a custom 256 color palette
'
CALL WriteRGB(63, 63, 63, 1) ' From all white
CALL WriteRGB(63, 0, 0, 63) ' to red, and then
CALL WriteRGB(0, 63, 0, 127) ' to green, then
CALL WriteRGB(0, 0, 63, 191) ' to blue, and finally
CALL WriteRGB(63, 63, 63, 255) ' back to white...
'
CALL SetPal(1, 63) ' Each of these lines
CALL SetPal(63, 127) ' create a portion of
CALL SetPal(127, 191) ' the color spread. The
CALL SetPal(191, 255) ' two arguments are the
' start and ending slots
' for the spread...
'
' Rotate palette - this isn't how you would do it
' for speed (for more speed, inline the read/write code
' to eliminate subroutine calling overhead), but it
' does show how to do it. Notice the "sparklies" along
' the right hand edge. These are only apparent if your
' computer is fast enough. I believe this has to do with
' the registers being updated faster than the video card
' can keep up with or sothing like that. If anyone knows
' how to fix this, go for it!
'
DO
'
CALL ReadRGB(ored%, ogrn%, oblu%, 1) ' Read in slot 1.
'
FOR t% = 1 TO 254
CALL ReadRGB(red%, grn%, blu%, t% + 1) ' Read slots 2-255, then
CALL WriteRGB(red%, grn%, blu%, t%) ' shift to slots 1-254.
NEXT t%
'
CALL WriteRGB(ored%, ogrn%, oblu%, 255) ' Write what was in slot 1 to
' slot 255.
LOOP UNTIL INKEY$ <> ""
'
CLS
'
' Reset original RGB values
'
FOR t% = 0 TO 255
CALL WriteRGB(oldr%(t%), oldg%(t%), oldb%(t%), t%)
NEXT t%
SUB ReadRGB (red%, grn%, blu%, slot%)
'
OUT &H3C7, slot% ' Read RGB values from slot
'
red% = INP(&H3C9)
grn% = INP(&H3C9)
blu% = INP(&H3C9)
'
END SUB
SUB SetPal (start.slot%, end.slot%)
'
num.slots% = end.slot% - start.slot%
'
CALL ReadRGB(sr%, sg%, sb%, start.slot%)
CALL ReadRGB(er%, eg%, eb%, end.slot%)
'
rr% = ABS(er% - sr%): rg% = ABS(eg% - sg%): rb% = ABS(eb% - sb%)
rs% = SGN(er% - sr%): gs% = SGN(eg% - sg%): bs% = SGN(eb% - sb%)
'
stepr = (rr% / num.slots%) * rs%
stepg = (rg% / num.slots%) * gs%
stepb = (rb% / num.slots%) * bs%
'
r = sr%: g = sg%: b = sb%
wr% = r: wg% = g: wb% = b
'
FOR t% = start.slot% TO end.slot%
'
CALL WriteRGB(wr%, wg%, wb%, t%)
'
r = r + stepr: wr% = r
g = g + stepg: wg% = g
b = b + stepb: wb% = b
'
NEXT t%
'
END SUB
SUB WriteRGB (red%, grn%, blu%, slot%)
'
OUT &H3C8, slot% ' Write RGB values to slot
'
OUT &H3C9, red%
OUT &H3C9, grn%
OUT &H3C9, blu%
'
END SUB
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