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Topic: Snowfall (Read 672 times) |
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David Williams
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Snowfall
« Thread started on: Nov 10th, 2016, 11:46pm » |
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This can be made so much more interesting, in numerous ways.
Code: REM "Snowfall" // v1.0 (11-Nov-2016)
REM Works with BB4W and BBCSDL
*ESC OFF
REM Make 5 MB available for this program:
M% = 5
HIMEM = LOMEM + M%*&100000
HIMEM = (HIMEM + 3) AND -4
BB4W% = (INKEY(-256) == &57)
IF BB4W% THEN
GetTicks$ = "GetTickCount"
SetWindowText$ = "SetWindowText"
ELSE
GetTicks$ = "SDL_GetTicks"
SetWindowText$ = "SDL_SetWindowTitle"
ENDIF
ScrW% = 800
ScrH% = 600
VDU 23,22,ScrW%;ScrH%;8,16,16,0 : OFF
REM Create full-screen (or full-window) background bitmap:
DIM bmp{ a%, w%, h% }
bmp.w% = ScrW%
bmp.h% = ScrH%
bmp.a% = FNcreateBMP32( bmp.w%, bmp.h% )
PROCInitGLIB( g{}, bmp.w%, bmp.h% )
g.a% = bmp.a% + 54
REM Create background image:
bgImg% = FNmalloc( 4*ScrW%*ScrH% )
FOR Y% = 0 TO ScrH%-1
f = 1 - (Y%/(ScrH%-1))^2
C% = &10000*INT(150*f) OR &100*INT(160*f) OR INT(255*f)
L% = bgImg%+4*Y%*ScrW%
FOR I% = L% TO L%+4*(ScrW%-1) STEP 4
!I% = C%
NEXT
NEXT
REM Create 4x4 snowflake sprites:
numSnowflakes% = 500
numFlakeTypes% = 100 : REM By 'type' I mean opacity level
flakeSize% = 4
DIM flakeAddr%( numFlakeTypes%-1 )
FOR I% = 0 TO numFlakeTypes%-1
flakeAddr%(I%) = FNmalloc(4*flakeSize%^2)
NEXT I%
FOR J% = 0 TO numFlakeTypes%-1
C% = &FFFFFF OR INT((255*J%/(numFlakeTypes%-1)) << 24)
FOR I% = flakeAddr%(J%) TO flakeAddr%(J%)+4*flakeSize%^2-1 STEP 4
!I% = C%
NEXT
NEXT
DIM flake{(numSnowflakes%-1) type%, x%, y}
FOR I% = 0 TO numSnowflakes%-1
flake{(I%)}.type% = (numFlakeTypes%-1)*I%/(numSnowflakes%-1)
flake{(I%)}.x% = RND(ScrW%)-1
flake{(I%)}.y = RND(ScrH%)-1
NEXT
frames% = 0
frameRate% = 0
SYS GetTicks$ TO time0%
TIME = 0
REPEAT
SYS BPlot, g{}, bgImg%, ScrW%, ScrH%, 0, 0
G% = g{}
P% = PlotAlphaBlend
FOR I% = 0 TO numSnowflakes%-1
T% = flake{(I%)}.type%
SYS P%, G%, flakeAddr%(T%), 4, 4, flake{(I%)}.x%, flake{(I%)}.y
f = T%/(numFlakeTypes%-1)
flake{(I%)}.y -= f*2
IF flake{(I%)}.y < -flakeSize% THEN
flake{(I%)}.x% = RND(ScrW%)-1
flake{(I%)}.y = ScrH%-1
ENDIF
NEXT
OSCLI "MDISPLAY "+STR$~bmp.a%
frames% += 1
SYS GetTicks$ TO time1%
IF time1%-time0% >= 1000 THEN
frameRate% = frames%
frames% = 0
SYS SetWindowText$, @hwnd%, STR$frameRate% + " fps"
SYS GetTicks$ TO time0%
ENDIF
WAIT 1
UNTIL FALSE
END
DEF FNcreateBMP32( W%, H% )
LOCAL A%, S%
S% = 54 + 4*W%*H% + 6
DIM A% S%-1
A% = ((A% + 3) AND -4) + 2
A%?0 = ASC"B"
A%?1 = ASC"M"
A%!2 = 54 + 4*W%*H%
A%!6 = 0
A%!10 = 54
A%!14 = 40
A%!18 = W%
A%!22 = H%
A%?26 = 1
A%?28 = 32
A%!30 = 0
A%!34 = 4*W%*H%
A%!38 = 0
A%!42 = 0
A%!46 = 0
A%!50 = 0
= A%
REM ============================================================================
REM ============================================================================
REM ============================================================================
REM ============================================================================
DEFFNGetGLIBVer:="0.01zz"
DEFPROCInitGLIB(RETURN v{},W%,H%):LOCALS%,Z%:DIMv{a%,w%,h%}
v.w%=W%
v.h%=H%
Z%=FNmalloc(4096)
S%=FNmalloc(2048)
$S%="608B5C2424C703FFFFFFFF8B7C24383B7C24280F8DC70000008B74243C3B74242C0F8DB9"
$S%+="0000008B4C24308B54243483F9007D03F7D99083FA007D03F7DA90F7D93BF90F8E970000"
$S%+="00F7DA3BF20F8E8D000000F7D9F7DAC70300000000C7430400000000C7430800000000C7"
$S%+="430C00000000894B10895314897B1889731C8BEF03E93B6C24287E0E2B6C2428296B10C7"
$S%+="4304FFFFFFFF83FF007D14297B0C017B10C7431800000000C74304FFFFFFFF8BEE03EA3B"
$S%+="6C242C7E0E2B6C242C296B14C74304FFFFFFFF83FE007D14297308017314C7431C000000"
$S%+="00C74304FFFFFFFF61C21C0060":gClip=FN`m(S%,0)
$S%="608BEC81EC800000008B75248BC4FF7538FF7534FF7530FF752CFF7608FF760450E85FFE"
$S%+="FFFFF70424FFFFFFFF0F85570000008B552C89542434C1642434020FAF5424080354240C"
$S%+="C1E2020355288B7E04897C2438C1642438020FAF7C241C037C2418C1E702033E8BF28B5C"
$S%+="24108B4424348B5424388B6C241456578BCBFCF3A55F5E03F003FA4D7FF081C480000000"
$S%+="61C218008B":BPlot=FN`m(S%,33)
$S%="608BEC81EC800000008B75248BC4FF7538FF7534FF7530FF752CFF7608FF760450E85FFE"
$S%+="FFFFF70424FFFFFFFF0F85690000008B552C89542434C1642434020FAF5424080354240C"
$S%+="C1E2020355288B7E04897C2438C1642438020FAF7C241C037C2418C1E702033E8B5C2410"
$S%+="33C98B048AA9000000FF740F3D000000FF722725FFFFFF0089048F83C1013BCB7CE00354"
$S%+="2434037C2438FF4C241475D081C48000000061C218008BF0C1EE180FB66C8A020FB6448F"
$S%+="022BE80FAFEEC1FD0803C588448F020FB66C8A010FB6448F012BE80FAFEEC1FD0803C588"
$S%+="448F010FB62C8A0FB6048F2BE80FAFEEC1FD0803C588048FC6448F030083C1013BCB0F8C"
$S%+="6EFFFFFF03542434037C2438FF4C24140F855AFFFFFF81C48000000061C2180060"
PlotAlphaBlend=FN`m(S%,33)
Z%=FNmalloc(4096)
ENDPROC
DEFFN`m(S%,O%)
LOCALA%,I%:A%=FNmalloc(LEN$S%):FORI%=0TOLEN$S%DIV2-1
A%?I%=EVAL("&"+MID$($S%,2*I%+1,2)):NEXT
IFO%>0PROC`d(A%,O%,gClip)
=A%
DEFPROC`d(B%,O%,C%):LOCALD%,P%:D%=C%-B%-O%-5:P%=B%+O%+1:!P%=D%:ENDPROC
DEFFNmalloc(N%):LOCALA%:DIM A% N%+7:A%=(A%+7) AND -8:=A%
REM ****************************************************************************
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DDRM
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Re: Snowfall
« Reply #1 on: Nov 11th, 2016, 08:28am » |
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Hi David,
I agree it's of limited visual interest, unless you subscribe to TV channels of a burning fire...
...However there's some interesting code there, that I will be playing with. I like the routine to set up a bitmap yourself, for example, and I'll have a think about your methods of memory allocation.
Could I interest you in adding a few lines of comments, just saying what the less obvious routines do? I think InitGLIB is "hard-coding" some assembler routines (effectively using FN'm to "assemble" them). I like the way you can then use these using SYS to pass parameters - guidance on how/why that works would be nice, since the machine code is pretty opaque...
Why is there a Z%=FNmalloc(4096) at the end of the routine? Doesn't that just throw away a pile of memory, since you'll lose the "handle" to it as you leave? REMming it out doesn't seem to matter, but maybe it does behind the scenes...
Best wishes,
D
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DDRM
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Re: Snowfall
« Reply #2 on: Nov 11th, 2016, 1:22pm » |
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Ooh, I'd missed the significance of "works with BB4W and BBCSDL". Now I understand why you've written your own malloc and CreateBMP routines. So your PlotAlphaBlend is your own version of the Windows API call.
Is this roughly correct as an understanding of what happens?
You define a 32 bit bitmap, which you tell your GLIB about. You can then draw blocks of image data (rather than actual bitmaps) to it using the library.
You make a background image of the blue gradient
You make a set of "sprites" of the snowflake at each level of transparency: basically just a block of data containing the image data (including transparency data).
You define a set of snowflakes, each with its own position data, and index to a level of transparency.
You use BPLot to blast the background image onto your bitmap, at full opacity.
Then you use PlotAlphaBlend to add each snowflake, at the relevant transparency, to your bitmap.
You use the standard BB4W/BBCSDL *MDISPLAY command to copy your working bitmap to the BB4W display.
There are a few places where you seem to have an extra version of some variables - for example, you define P%=PlotAlphaBlend. Is that a legacy issue from development, or because you are passing the address of the routine in the pointer variable? SYS calls don't normally need the address to be passed in P%?
Thanks,
D
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David Williams
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Re: Snowfall
« Reply #3 on: Nov 11th, 2016, 5:15pm » |
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on Nov 11th, 2016, 08:28am, DDRM wrote:I agree it's of limited visual interest, unless you subscribe to TV channels of a burning fire...
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I think I've actually spent an hour-or-so of my life watching one of those late-night log fires on some German TV channel. But that was a very long time ago. 
Quote:| I'll have a think about your methods of memory allocation. |
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After using DIM to allocate a block of memory, I then ensure that the start address of that memory block is divisible by 8 (although divisibility by 4 would suffice in this case). Certainly if MMX machine code instructions were used in the alpha blending routine (they're not), then (IIRC) divisibility by 8 is a must. Otherwise 4 will do.
Quote:| Could I interest you in adding a few lines of comments, just saying what the less obvious routines do? I think InitGLIB is "hard-coding" some assembler routines (effectively using FN'm to "assemble" them). I like the way you can then use these using SYS to pass parameters - guidance on how/why that works would be nice, since the machine code is pretty opaque... |
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The version of GLIB appended to the 'Snowfall' program is much reduced from the 'full' version which contains a lot more functionality, but which isn't compatible with BBCSDL. For instance, the full version of GLIB includes an image loader and converter (for loading BMP, JPEG and GIF images and converting them to 'raw' 32bpp ARGB bitmaps). It also includes code for synchronising animation with the monitor's refresh (again, not compatible with BBCSDL). Some other useful functions also had to be dropped.
You won't need reminding, but in case others are wondering... GLIB is a compact 'sprite' plotting library, the motivating idea being that it's minimally functional and small enough to be used with the Trial version of BB4W. Assembly language would have taken up too much memory, so I assembled the assembler code and then formatted the resulting binary machine code into strings.
Quote:| Why is there a Z%=FNmalloc(4096) at the end of the routine? Doesn't that just throw away a pile of memory, since you'll lose the "handle" to it as you leave? REMming it out doesn't seem to matter, but maybe it does behind the scenes... |
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That's to do with code/data separation - very important for speed purposes. There should be a gap (at least 2Kb, IIRC) between a machine code routine, and data that it accesses (if performance is critical). I'm probably going a bit overboard with 4Kb, but there's so much memory available these days! So I ensure that there are 4Kb 'gaps' either side of the machine code section.
Quote:| Is this roughly correct as an understanding of what happens? |
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What you go on to describe is correct.
Quote:| There are a few places where you seem to have an extra version of some variables - for example, you define P%=PlotAlphaBlend. Is that a legacy issue from development, or because you are passing the address of the routine in the pointer variable? SYS calls don't normally need the address to be passed in P%? |
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Accessing the resident static variables (A%, B%, ..., Z%) is slightly faster than accessing other types (notwithstanding BB4W's REM!Faster compiler directive), so I stuff the address of the alpha-blending sprite plotting routine (PlotAlphaBlend) into P%, and the base address of the structure g{} into G%. This speeds up execution a little (but probably only a little). I should have put the P% and G% variable assignments outside the main loop.
Sorry I didn't go into much detail, but must get ready for work now!
David.
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David Williams
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Re: Snowfall
« Reply #4 on: Nov 11th, 2016, 9:25pm » |
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Here's a blast from the past (many will have already seen this, I think). Try 150 to 200 snowflakes to begin with.
Code: REM. Tumbling Snowflakes (1)
REM. Version 1.2 // 3.1.2013
REM. Uses only standard BB4W graphics commands
REM. (Does not use GFXLIB!)
*ESC OFF
*FLOAT 64
ON ERROR PROC_error( REPORT$, TRUE )
PROC_fixWindowSize
MODE 8
WinW% = @vdu%!208
WinH% = @vdu%!212
REPEAT
INPUT '" How many snowflakes? (1 - 300): "flakes%
UNTIL flakes% > 0 AND flakes% <= 300
COLOUR 128, 200, 200, 250
COLOUR 15, 255, 255, 255
OFF
pi2 = PI * 2
scale = 20
DIM flake{( flakes%-1 ) x, y, dy, a, b, c, da, db, dc, amp, theta, dtheta}
DIM p(5,2), q(5,2), m(2,2)
REM. Define 'snowflake' object
FOR I% = 0 TO 5
angle = 2*PI/6 * I%
p(I%, 0) = 2*scale * SIN( angle )
p(I%, 1) = 2*scale * COS( angle )
p(I%, 2) = 0
NEXT I%
REM. Define initial snowflake params
FOR I% = 0 TO flakes%-1
PROC_newSnowflake( I%, FALSE )
NEXT I%
GCOL 15
*REFRESH OFF
REPEAT
CLS
FOR I% = 0 TO flakes%-1
x = 2 * (flake{(I%)}.x + flake{(I%)}.amp * SINflake{(I%)}.theta)
y = 2 * flake{(I%)}.y
flake{(I%)}.y += flake{(I%)}.dy
IF flake{(I%)}.y < -scale THEN
PROC_newSnowflake( I%, TRUE )
ENDIF
flake{(I%)}.theta += flake{(I%)}.dtheta
a = flake{(I%)}.a
b = flake{(I%)}.b
c = flake{(I%)}.c
flake{(I%)}.a += flake{(I%)}.da
flake{(I%)}.b += flake{(I%)}.db
flake{(I%)}.c += flake{(I%)}.dc
sA = SINa
cA = COSa
sB = SINb
cB = COSb
sC = SINc
cC = COSc
m() = cB*cC, -cA*sC+sA*sB*cC, sA*sC+cA*sB*cC, \
\ cB*sC, cA*cC+sA*sB*sC, -sA*cC+cA*sB*sC, \
\ -sB, sA*cB, cA*cB
q() = p().m()
MOVE x+q(0,0), y+q(0,1)
MOVE x+q(2,0), y+q(2,1)
PLOT 85, x+q(4,0), y+q(4,1)
MOVE x+q(5,0), y+q(5,1)
MOVE x+q(1,0), y+q(1,1)
PLOT 85, x+q(3,0), y+q(3,1)
NEXT
*REFRESH
UNTIL INKEY(1)=0
END
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DEF PROC_newSnowflake( I%, R% )
flake{( I% )}.x = WinW% * RND(1)
IF R% THEN
flake{( I% )}.y = WinH% + scale
ELSE
flake{( I% )}.y = WinH% * (1.0 + RND(1))
ENDIF
flake{( I% )}.dy = -(0.5 + 3.5*RND(1))
flake{( I% )}.a = 2*PI * RND(1)
flake{( I% )}.b = 2*PI * RND(1)
flake{( I% )}.c = 2*PI * RND(1)
flake{( I% )}.da = (RND(1)-RND(1)) / 10
flake{( I% )}.db = (RND(1)-RND(1)) / 10
flake{( I% )}.dc = (RND(1)-RND(1)) / 10
flake{(I%)}.amp = 32 * RND(1)
flake{(I%)}.theta = 2*PI * RND(1)
flake{(I%)}.dtheta = (RND(1)-RND(1)) / 10
ENDPROC
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DEF PROC_fixWindowSize
LOCAL GWL_STYLE, WS_THICKFRAME, WS_MAXIMIZEBOX, ws%
GWL_STYLE = -16
WS_THICKFRAME = &40000
WS_MAXIMIZEBOX = &10000
SYS "GetWindowLong", @hwnd%, GWL_STYLE TO ws%
SYS "SetWindowLong", @hwnd%, GWL_STYLE, ws% AND NOT (WS_THICKFRAME+WS_MAXIMIZEBOX)
ENDPROC
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DEF PROC_error( msg$, L% )
OSCLI "REFRESH ON" : CLS : ON : *FONT
COLOUR 128, 0, 0, 0 : COLOUR 128 : CLS
COLOUR 1, &FF, &FF, &FF
COLOUR 1
PRINT TAB(1,1)msg$;
VDU 7
IF L% THEN
PRINT " at line "; ERL;
ENDIF
REPEAT : SYS "Sleep", 10 : UNTIL FALSE
ENDPROC
EDIT: Here's links to other blasts from the past. You can run the executables (EXE files), but not the source (.BBC) files unless you have GFXLIB installed (not currently available).
Google Drive:
https://drive.google.com/open?id=0B3j5sIQi9SskZEN6VVJZVkJLZnc
https://drive.google.com/open?id=0B3j5sIQi9SskWVZxSGJuU1ZWRDQ
David.
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David Williams
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Re: Snowfall
« Reply #5 on: Nov 21st, 2016, 5:43pm » |
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Now the snow's tumbling...
Requires latest version of GLIB, available from here:
http://pastebin.com/Typpfjtg
Or, along with a compiled EXE, from here:
https://drive.google.com/open?id=0B3j5sIQi9SskakxkcDRDN2dSR1k
Ensure that GLIB is installed in BB4W's LIB folder.
Code:
REM "Snowfall II"
REM Requires GLIB v0.23+
*ESC OFF
ON ERROR PROCerror( REPORT$ + " at line " + STR$ERL )
INSTALL @lib$ + "GLIB.BBC"
PROCFixWindowSize
MODE 8 : OFF
PROCInitGLIB(g{}, glib{})
ON CLOSE PROCCleanup : QUIT
ON ERROR PROCCleanup : PROCerror( REPORT$ + " at line " + STR$ERL )
ScrW% = @vdu%!208
ScrH% = @vdu%!212
PxlBuf% = FNmalloc( 4*320, -1 )
DIM inVars{ bmAddr%, bmW%, bmH%, rectX%, rectY%, rectW%, rectH%, keyCol% }
DIM outVars{ minX%, minY%, maxX%, maxY%, totalPxls%, totalKeyPxls%, totalNonKeyPxls% }
NumSnowflakeBitmaps% = 32
NumSnowflakes% = 200
DIM SnowflakeBitmap{(NumSnowflakeBitmaps%-1) a%, w%, h%}
DIM Snowflake{(NumSnowflakes%-1) i%, x0, xamp, xt, dxt, y, dy, minY, angle, angleinc, scale}
inVars.bmAddr% = g.a%
inVars.bmW% = g.w%
inVars.bmH% = g.h%
inVars.rectX% = 0
inVars.rectY% = 0
inVars.rectW% = ScrW%
inVars.rectH% = ScrH%
inVars.keyCol% = 0
COLOUR 15, 255, 255, 255 : GCOL 15
*REFRESH OFF
FOR J% = 0 TO NumSnowflakeBitmaps%-1
CLS
FOR I% = 1 TO 10
CIRCLE FILL 2*(ScrW%/2+64*(RND(1)-.5)), 2*(ScrH%/2+64*(RND(1)-0.5)), 2*(16+RND(15))
NEXT I%
SYS glib.ScanBitmap%, inVars{}, outVars{}
outVars.minX% -= 4
outVars.minY% -= 4
outVars.maxX% += 4
outVars.maxY% += 4
X% = outVars.minX%
Y% = outVars.minY%
W% = outVars.maxX% - outVars.minX% + 1
H% = outVars.maxY% - outVars.minY% + 1
SnowflakeBitmap{(J%)}.a% = -1
PROCGrab( g{}, glib{}, SnowflakeBitmap{(J%)}.a%, X%, Y%, W%, H%, \
\ x%, y%, w%, h%, clipFlag%, rejectFlag% )
SnowflakeBitmap{(J%)}.w% = W%
SnowflakeBitmap{(J%)}.h% = H%
FOR I% = 1 TO 3
SYS glib.BoxBlur%, SnowflakeBitmap{(J%)}.a%, W%, H%, 3, PxlBuf%
NEXT I%
SYS glib.CopyToAlphaChannel%, SnowflakeBitmap{(J%)}.a%, W%, H%, 1, 0
SYS glib.PremultiplyAlpha%, SnowflakeBitmap{(J%)}.a%, W%, H%
NEXT J%
CLS : COLOUR 2
*FONT "TIMES", 96, B
PRINT '" SNOW"
*FONT
COLOUR 7
SYS glib.ScanBitmap%, inVars{}, outVars{}
outVars.minX% -= 4
outVars.minY% -= 4
outVars.maxX% += 4
outVars.maxY% += 4
X% = outVars.minX%
Y% = outVars.minY%
snowBmW% = outVars.maxX% - outVars.minX% + 1
snowBmH% = outVars.maxY% - outVars.minY% + 1
snowBm% = -1
PROCGrab( g{}, glib{}, snowBm%, X%, Y%, snowBmW%, snowBmH%, \
\ x%, y%, w%, h%, clipFlag%, rejectFlag% )
FOR I% = 0 TO NumSnowflakes%-1
f = I%/(NumSnowflakes%-1)
Snowflake{(I%)}.i% = RND(NumSnowflakeBitmaps%)-1
Snowflake{(I%)}.x0 = 640*RND(1)
Snowflake{(I%)}.y = 512*RND(1)
Snowflake{(I%)}.dy = -(0.5 + 1.5*f)
Snowflake{(I%)}.angle = RND(360)
Snowflake{(I%)}.angleinc = (0.5 + 1.5*RND(1)) * SGN(RND(1)-0.5)
Snowflake{(I%)}.scale = (0.125 + f*0.125*RND(1)) * &10000
Snowflake{(I%)}.minY = -SnowflakeBitmap{( Snowflake{(I%)}.i% )}.h% * Snowflake{(I%)}.scale/&10000
Snowflake{(I%)}.xamp = 5 + 30*RND(1)
Snowflake{(I%)}.xt = 2*PI*RND(1)
Snowflake{(I%)}.dxt = 0.01 + 0.01*f*RND(1)
NEXT I%
GetTickCount% = FNSYS_NameToAddress("GetTickCount")
TIME = 0
frames% = 0
frameRate% = 0
SYS GetTickCount% TO time0%
REPEAT
SYS glib.ClrLG%, g{}, &D0D0FF, &000040
G% = g{}
P% = glib.PlotRotateScaleBilinear%
FOR I% = 0 TO NumSnowflakes%-1
i% = Snowflake{(I%)}.i%
x = Snowflake{(I%)}.x0 + Snowflake{(I%)}.xamp*SIN(Snowflake{(I%)}.xt)
SYS P%, G%, SnowflakeBitmap{(i%)}.a%, SnowflakeBitmap{(i%)}.w%, SnowflakeBitmap{(i%)}.h%, \
\ 16*x, 16*Snowflake{(I%)}.y, &10000*Snowflake{(I%)}.angle, Snowflake{(I%)}.scale
Snowflake{(I%)}.angle += Snowflake{(I%)}.angleinc
IF ABSSnowflake{(I%)}.angle >= 360 THEN
Snowflake{(I%)}.angle -= Snowflake{(I%)}.angle
ENDIF
Snowflake{(I%)}.y+=Snowflake{(I%)}.dy
IF Snowflake{(I%)}.y < Snowflake{(I%)}.minY THEN
Snowflake{(I%)}.x0 = 640*RND(1)
Snowflake{(I%)}.y = ScrH%-Snowflake{(I%)}.minY
ENDIF
Snowflake{(I%)}.xt += Snowflake{(I%)}.dxt
NEXT I%
SYS glib.PlotShadow%, G%, snowBm%, snowBmW%, snowBmH%, (ScrW%-snowBmW%)/2-12, (ScrH%-snowBmH%)/2-12
SYS glib.PlotBlend%, G%, snowBm%, snowBmW%, snowBmH%, (ScrW%-snowBmW%)/2, (ScrH%-snowBmH%)/2, 220
PRINT TAB(2,1);frameRate%;" fps"
PROCDisplay(TRUE)
frames% += 1
SYS GetTickCount% TO time1%
IF time1%-time0% >= 1000 THEN
frameRate% = frames%
frames% = 0
SYS GetTickCount% TO time0%
ENDIF
UNTIL FALSE
PROCCleanup
REPEAT UNTIL INKEY(1)=0
END
DEF PROCerror(s$)
OSCLI "REFRESH ON"
ON : CLS : COLOUR 7, 160, 160, 160 : COLOUR 7
PRINT '" " + s$;
VDU 7
REPEAT UNTIL INKEY(1)=0
ENDPROC
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michael
Senior Member
member is offline
Posts: 335
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Re: Snowfall
« Reply #6 on: Nov 21st, 2016, 6:48pm » |
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Amazing work
And thanks for the snow
I had to put the GLIB in a different directory, and made it local in the INSTALL "GLIB.BBC"
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| « Last Edit: Nov 21st, 2016, 6:52pm by michael » |
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I like making program generators and like reinventing the wheel
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David Williams
Developer
member is offline
meh
Gender:
Posts: 452
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Re: Snowfall
« Reply #7 on: Nov 22nd, 2016, 07:29am » |
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Now with more, slightly fluffier snow, a snowman, flashing lights and music. To run the program listed below, you'll need the latest version of GLIB (v0.24 beta), available from here:
http://pastebin.com/BZBKQSLi
Or from this Zip folder which contains GLIB, a compiled EXE, and the source code:
https://drive.google.com/open?id=0B3j5sIQi9SskaVlqTlMtREgxUjg
GLIB.BBC needs to go in BB4W's LIB folder.
Code:
REM "Snowfall III"
REM Now with more snowflakes, a snowman, coloured lights, and a tune.
REM Requires GLIB v0.24+
*ESC OFF
ON ERROR PROCerror( REPORT$ + " at line " + STR$ERL )
INSTALL @lib$ + "GLIB.BBC"
PROCFixWindowSize
MODE 8 : OFF
PROCInitGLIB(g{}, glib{})
ON CLOSE SOUND OFF : PROCCleanup : QUIT
ON ERROR SOUND OFF : PROCCleanup : PROCerror( REPORT$ + " at line " + STR$ERL )
DIM g2{} = g{}
file$ = @tmp$ + "snowman_256x359_gif.GIF"
file% = OPENIN( file$ )
IF file% = 0 THEN
url$ = "https://i.imgbox.com/z7pse7CC.gif"
PROCurldownload(url$, file$)
ENDIF
CLOSE#file%
snowman% = FNLoadImg( file$, -1 )
snowmanW% = 256
snowmanH% = 359
file$ = @tmp$ + "silent_night_midi.MID"
file% = OPENIN( file$ )
IF file% = 0 THEN
url$ = "http://www.westnet.com/Holiday/midi/09silen&.mid"
PROCurldownload(url$, file$)
ENDIF
CLOSE#file%
SOUND OFF
OSCLI "PLAY """+file$+""""
ScrW% = @vdu%!208
ScrH% = @vdu%!212
PxlBuf% = FNmalloc( 4*320, -1 )
MskBuf% = FNmalloc( 4*256^2, -1 )
DIM inVars{ bmAddr%, bmW%, bmH%, rectX%, rectY%, rectW%, rectH%, keyCol% }
DIM outVars{ minX%, minY%, maxX%, maxY%, totalPxls%, totalKeyPxls%, totalNonKeyPxls% }
NumSnowflakeBitmaps% = 32
NumSnowflakes% = 300
NumStars% = 20
DIM star{( NumStars%-1 ) opacity%, x%, y%, tint%}
DIM SnowflakeBitmap{(NumSnowflakeBitmaps%-1) a%, w%, h%}
DIM Snowflake{(NumSnowflakes%-1) i%, x0, xamp, xt, dxt, y, dy, minY, angle, angleinc, scale}
inVars.bmAddr% = g.a%
inVars.bmW% = g.w%
inVars.bmH% = g.h%
inVars.rectX% = 0
inVars.rectY% = 0
inVars.rectW% = ScrW%
inVars.rectH% = ScrH%
inVars.keyCol% = 0
COLOUR 15, 255, 255, 255 : GCOL 15
*REFRESH OFF
_PREMULTIPLY = &1
_INVERT = &8
_2MRPASS = 0 * (2<<4)
_3MRPASS = 3<<4
_3MBBPASS = 3<<6
_MBBKSIZE5 = 1<<8
FOR J% = 0 TO NumSnowflakeBitmaps%-1
CLS
FOR I% = 1 TO 10
CIRCLE FILL 2*(ScrW%/2+64*(RND(1)-.5)), 2*(ScrH%/2+64*(RND(1)-0.5)), 2*(16+RND(15))
NEXT I%
SYS glib.ScanBitmap%, inVars{}, outVars{}
outVars.minX% -= 4
outVars.minY% -= 4
outVars.maxX% += 4
outVars.maxY% += 4
X% = outVars.minX%
Y% = outVars.minY%
W% = outVars.maxX% - outVars.minX% + 1
H% = outVars.maxY% - outVars.minY% + 1
SnowflakeBitmap{(J%)}.a% = -1
PROCGrab( g{}, glib{}, SnowflakeBitmap{(J%)}.a%, X%, Y%, W%, H%, \
\ x%, y%, w%, h%, clipFlag%, rejectFlag% )
SnowflakeBitmap{(J%)}.w% = W%
SnowflakeBitmap{(J%)}.h% = H%
C% = _PREMULTIPLY + _INVERT + _3MRPASS + _MBBKSIZE5 + _3MBBPASS
PROCCreateAlphaMask(g{}, glib{}, SnowflakeBitmap{(J%)}.a%, W%, H%, 0, C%)
NEXT J%
CLS : COLOUR 2
*FONT "TIMES", 96, B
PRINT '" 2016"
*FONT
COLOUR 7
SYS glib.ScanBitmap%, inVars{}, outVars{}
outVars.minX% -= 4
outVars.minY% -= 4
outVars.maxX% += 4
outVars.maxY% += 4
X% = outVars.minX%
Y% = outVars.minY%
snowBmW% = outVars.maxX% - outVars.minX% + 1
snowBmH% = outVars.maxY% - outVars.minY% + 1
snowBm% = -1
PROCGrab( g{}, glib{}, snowBm%, X%, Y%, snowBmW%, snowBmH%, \
\ x%, y%, w%, h%, clipFlag%, rejectFlag% )
CLS
N% = 12
x0% = 320
y0% = 256
Rmax% = 180
Rmin% = Rmax%/3
MOVE 2*x0%, 2*(y0%+Rmax%)
FOR I% = 0 TO 2*N%
IF (I% MOD 2) = 0 THEN R%=Rmax% ELSE R%=Rmin%
X% = x0% + R%*SIN(2*PI*I%/(2*N%))
Y% = y0% + R%*COS(2*PI*I%/(2*N%))
DRAW 2*X%, 2*Y%
NEXT I%
COLOUR 15, 255, 255, 255 : GCOL 15
FILL 2*x0%, 2*y0%
SYS glib.ScanBitmap%, inVars{}, outVars{}
outVars.minX% -= 4
outVars.minY% -= 4
outVars.maxX% += 4
outVars.maxY% += 4
X% = outVars.minX%
Y% = outVars.minY%
starBmW% = outVars.maxX% - outVars.minX% + 1
starBmH% = outVars.maxY% - outVars.minY% + 1
starBm% = -1
PROCGrab( g{}, glib{}, starBm%, X%, Y%, starBmW%, starBmH%, \
\ x%, y%, w%, h%, clipFlag%, rejectFlag% )
starW% = 48
starH% = 48
star% = FNmalloc( 4*starW%*starH%, -1 )
g2.a% = star%
g2.w% = starW%
g2.h% = starH%
SYS glib.PlotRotateScaleBilinear%, g2{}, starBm%, starBmW%, starBmH%, \
\ 16*starW%/2, 16*starH%/2, 0, 0.125*&10000
FOR I% = 0 TO NumSnowflakes%-1
f = I%/(NumSnowflakes%-1)
Snowflake{(I%)}.i% = RND(NumSnowflakeBitmaps%)-1
Snowflake{(I%)}.x0 = 640*RND(1)
Snowflake{(I%)}.y = 512*RND(1)
Snowflake{(I%)}.dy = -(0.5 + 1.5*f)
Snowflake{(I%)}.angle = RND(360)
Snowflake{(I%)}.angleinc = (0.5 + 1.5*RND(1)) * SGN(RND(1)-0.5)
Snowflake{(I%)}.scale = (0.125 + f*0.125*RND(1)) * &10000
Snowflake{(I%)}.minY = -SnowflakeBitmap{( Snowflake{(I%)}.i% )}.h% * Snowflake{(I%)}.scale/&10000
Snowflake{(I%)}.xamp = 5 + 30*RND(1)
Snowflake{(I%)}.xt = 2*PI*RND(1)
Snowflake{(I%)}.dxt = 0.01 + 0.01*f*RND(1)
NEXT I%
GetTickCount% = FNSYS_NameToAddress("GetTickCount")
SetWindowText% = FNSYS_NameToAddress("SetWindowText")
FOR I% = 0 TO NumStars%-1 : star{(I%)}.opacity%=0 : NEXT
TIME = 0
frames% = 0
frameRate% = 0
SYS GetTickCount% TO time0%
REPEAT
G% = g{}
P% = glib.PlotRotateScaleRTR%
SYS glib.ClrLG%, G%, &D0D0FF, &000040
SYS glib.Plot%, G%, snowman%, snowmanW%, snowmanH%, (ScrW%-snowmanW%)/2, 0
FOR I% = 0 TO NumSnowflakes%-1
i% = Snowflake{(I%)}.i%
x = Snowflake{(I%)}.x0 + Snowflake{(I%)}.xamp*SIN(Snowflake{(I%)}.xt)
SYS P%, G%, SnowflakeBitmap{(i%)}.a%, SnowflakeBitmap{(i%)}.w%, SnowflakeBitmap{(i%)}.h%, \
\ 16*x, 16*Snowflake{(I%)}.y, &10000*Snowflake{(I%)}.angle, Snowflake{(I%)}.scale
Snowflake{(I%)}.angle += Snowflake{(I%)}.angleinc
IF ABSSnowflake{(I%)}.angle >= 360 THEN
Snowflake{(I%)}.angle -= Snowflake{(I%)}.angle
ENDIF
Snowflake{(I%)}.y+=Snowflake{(I%)}.dy
IF Snowflake{(I%)}.y < Snowflake{(I%)}.minY THEN
Snowflake{(I%)}.x0 = 640*RND(1)
Snowflake{(I%)}.y = ScrH%-Snowflake{(I%)}.minY
ENDIF
Snowflake{(I%)}.xt += Snowflake{(I%)}.dxt
NEXT I%
x0% = (ScrW% - snowBmW%)/2 - 8
y0% = 380-8
t = TIME/120
k = 2*PI
FOR Y% = 0 TO snowBmH%-1
f = k*Y%/(snowBmH%-1)
X% = x0% + 8*SIN(f+t)
SYS glib.PlotShadow%, G%, snowBm% + 4*snowBmW%*Y%, snowBmW%, 1, X%, y0%+Y%
NEXT
x0% = (ScrW% - snowBmW%)/2
y0% = 380
FOR Y% = 0 TO snowBmH%-1
f = k*Y%/(snowBmH%-1)
X% = x0% + 8*SIN(f+t)
SYS glib.PlotBlend%, G%, snowBm% + 4*snowBmW%*Y%, snowBmW%, 1, X%, y0%+Y%, 200
NEXT
IF RND(20) = 1 THEN
FOR I% = 0 TO NumStars%-1
IF star{(I%)}.opacity% = 0 THEN
star{(I%)}.opacity% = 255
star{(I%)}.x% = RND(ScrW%)-starW%/2 - 1
star{(I%)}.y% = RND(ScrH%)-starH%/2 - 1
CASE RND(10) OF
WHEN 1 : star{(I%)}.tint% = &80FF00
WHEN 2 : star{(I%)}.tint% = &FF8000
WHEN 3 : star{(I%)}.tint% = &FF80FF
WHEN 4 : star{(I%)}.tint% = &FF00FF
WHEN 5 : star{(I%)}.tint% = &FFFF00
WHEN 6 : star{(I%)}.tint% = &8080FF
WHEN 7 : star{(I%)}.tint% = &80FF80
WHEN 8 : star{(I%)}.tint% = &FFA080
WHEN 9 : star{(I%)}.tint% = &FFFFFF
WHEN 10 : star{(I%)}.tint% = &FF0000
ENDCASE
EXIT FOR
ENDIF
NEXT
ENDIF
FOR I% = 0 TO NumStars%-1
IF star{(I%)}.opacity% > 0 THEN
SYS glib.PlotTintBlend%, G%, star%, starW%, starH%, star{(I%)}.x%, star{(I%)}.y%, \
\ star{(I%)}.tint%, 256, star{(I%)}.opacity%
star{(I%)}.opacity% -= 4
IF star{(I%)}.opacity% < 0 THEN star{(I%)}.opacity% = 0
ENDIF
NEXT
PROCDisplay(TRUE)
frames% += 1
SYS GetTickCount% TO time1%
IF time1%-time0% >= 1000 THEN
frameRate% = frames%
frames% = 0
SYS SetWindowText%, @hwnd%, STR$frameRate%+" fps"
SYS GetTickCount% TO time0%
ENDIF
UNTIL FALSE
PROCCleanup
REPEAT UNTIL INKEY(1)=0
END
DEF PROCerror(s$)
OSCLI "REFRESH ON"
ON : CLS : COLOUR 7, 160, 160, 160 : COLOUR 7
PRINT '" " + s$;
VDU 7
REPEAT UNTIL INKEY(1)=0
ENDPROC
DEF PROCurldownload(url$, file$)
LOCAL urlmon%, res%
SYS "LoadLibrary", "urlmon.dll" TO urlmon%
SYS "GetProcAddress", urlmon%, "URLDownloadToFileA" TO `URLDownloadToFile`
SYS `URLDownloadToFile`, 0, url$, file$, 0, 0 TO res%
SYS "FreeLibrary", urlmon%
IF res% ERROR 100, "Couldn't download "+url$
ENDPROC
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