Blitz Basic and advanced graphics

[JPQ]

How i can limit which bitplanes used for functions like Circle,Boxf etc ? (all graphic functions expect sprites)
and which is fastest way (i think if i use pure blitz basic maybe shapes = bobs) are faster than Boxf when i need clipping ? if i dont need such thing which is fastest way ? i dont yet even know sure but very likely Boxf even its fast is maybe too slow.
and i cannot wrote itself function with assembler which draws things what i want.

Bitplanesbitmap sounds complicated becouse i must put stuff back to display which consumes time etc.

[JPQ]

I try made simple thing what i wrote program to test basic stuff where i add new realstuff when i get this working basic thing. i try combine 2 single bitmaps to 4 colour mode. and even maybe if Amiga power allow even 3 bitmaps to make 8 color mode.top it that i try use doublebuffering and i try draw own unique stuff all single bitmaps. its years ago when i coded and i never tired this thing before.
ps. btw i found do this anotherway if two 2 coloured bitmaps mixed to single 4 colour. easier but i want try with 3 bitmaps to 8colour... i going text this next.

NoCli
WBStartup
BLITZ

BitMap 0,320,256,2
BitMap 1,320,256,2
BitMap 2,320,256,1
BitMap 3,256,256,1
Slice 0,42,2
RGB 0,0,0,0
RGB 1,7,0,0
RGB 2,0,7,0
RGB 3,7,7,0
Repeat
Show BMAP
BMAP=1-BMAP
Use BitMap BMAP
;BitPlanesBitMap BMAP,2,1
Use BitMap 2
lasku=lasku+1
If lasku>3599 Then lasku=0
Cls 0
Circlef 160+Sin(lasku/180*Pi+Sin(lasku/90*Pi)*1)*128,128+Sin(lasku/360*Pi)*128,36,1
;Use BitMap 3
Cls 0
Circlef 160+Sin(lasku/90*Pi+Sin(lasku/180*Pi)*1)*128,128+Sin(lasku/360*Pi)*128,36,1
BitPlanesBitMap 2,BMAP,1
BitPlanesBitMap 3,BMAP,1
VWait
Until Joyb(0)=1
End

[JPQ]

Now i tired this: at least fs-uae graphics shows things what i dont want and graphics also flickers very much. still very likely problem is not fs-uae. becouse all other programs what i tested works fine even impossible mission 2025 which uses dualplayfield i bet. and i also bet is more heavy for emulator...

originally i try way wich worked real amiga fine non dual playfield display.(at least when i use older AmiBlitz).
i can position odd and even bitplanes own position using ShowB,and ShowF. to get specialfx.

NoCli
WBStartup
BLITZ

BitMap 0,320,256,1
BitMap 1,320,256,1
BitMap 2,320,256,1
BitMap 3,256,256,1
Slice 0,42,$fff8

For bm=0 To 3
Use BitMap bm
Cls 0
Next
RGB 0,08,05,04
RGB 1,15,05,03
RGB 2,08,12,03
RGB 3,15,12,03
Repeat
las=las+1
If las>3599 Then lask=0
bmap=2-bmap
Use BitMap bmap
;Cls 0
Circlef 160+Sin(las/360*Pi)*127,128+Cos(las/180*Pi)*127,30,1
Use BitMap bmap+1
;Cls 0
Circlef 160+Sin(las/120*Pi)*127,128+Cos(las/360*Pi)*127,30,1
ShowB bmap
ShowF bmap+1
VWait
Until Joyb(0)=1
End

[BippyM]

Originally Posted by JPQ

las=las+1
If las>3599 Then lask=0

There seems to be a typo in the above code!

Also the following code could cause an error!

bmap=2-bmap
Use BitMap bmap

This isn't defined properly, nor is it actually changed, so in effect this will always be the same result (2)

[alkis]

Originally Posted by bippym

Also the following code could cause an error!

bmap=2-bmap
Use BitMap bmap

This isn't defined properly, nor is it actually changed, so in effect this will always be the same result (2)

Ummm, I think it will toggle between 2 and 0.

[Lonewolf10]

Originally Posted by alkis

Ummm, I think it will toggle between 2 and 0.

Some languages do not like using the variable being calculated in the calculation itself. If Blitz doesn't complain about it (or crash!), then it should indeed toggle between 0 and 2 (or 2 and 0, whichever way you like to put it ).

(smallprint: I'm not a Blitz programmer)

[Cylon]

Originally Posted by JPQ

.
Bitplanesbitmap sounds complicated becouse i must put stuff back to display which consumes time etc.

I'll come back to this later, first i have to understand what you really want to get out.

I can walk you through Bitplanesbitmap (it is very easy), i'm not quite sure yet it is your solution.

[Cylon]

Originally Posted by Lonewolf10

Some languages do not like using the variable being calculated in the calculation itself. If Blitz doesn't complain about it (or crash!), then it should indeed toggle between 0 and 2 (or 2 and 0, whichever way you like to put it ).

(smallprint: I'm not a Blitz programmer)

Nope. It is fine. Blitz is great, indeed!

[Cylon]

Do you try to create a display with two transparent spheres?
Then i think i fixed it. a little.

NoCli
WBStartup
BLITZ

DEFTYPE.w  ;never ignore speed ;-)

BitMap 0,320,256,1
BitMap 1,320,256,1
BitMap 2,320,256,1
BitMap 3,256,256,1
;Slice 0,42,$fff8
Slice0,42,2  ;2planes, no special stuff

For bm.w=0 To 3
Use BitMap bm
Cls 0
Next
RGB 0,08,05,04
RGB 1,15,05,03
RGB 2,08,12,03
RGB 3,15,12,03

;some precalcs
;make a table here for sin() and cos()!!!!

Repeat
 las.w+1
If las>3599 Then las=0

bmap.w=2-bmap

Use BitMap bmap
;cls left commented as found
;Cls 0   ;use planeclear instead!!
;never do Sin() Cos() without tables!! floats beeing cast to quick (then to word) 50 times a second (well, maybe) 
Circlef 160+Sin(las/360 *Pi)*127,128+Cos(las/180 *Pi)*127,30,1

Use BitMap bmap+1

;Cls 0
Circlef 160+Sin(las/120 *Pi)*127,128+Cos(las/360 *Pi)*127,30,1

ShowB 0  ;
ShowF 1  ; 
VWait
Until Joyb(0)=1
End

I'm not sure yet, what you really want to achieve, but this way it works a little....

When you uncomment the CLS's, then flickering appears, because the screen is not redrawn or cleared fast enough. This is happening because the calculation inside the loop takes too long, also the CLS command is too slow. You can improve it by using a bitplane clear cmd using the CPU instead.

[idrougge]

There is a CPU bitmap clear routine in Blitz2:Examples/Blitzmode/Darts_poly.bb.