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- ;-------T-------T------------------------T----------------------------------;
- ;This is a demonstration of raining bobs, which I use as a test routine to
- ;see how fast some of my blitter routines are. It's a good example of using
- ;MBOB's, try out different MAX_IMAGES values to see how many you can get on
- ;screen. **120** 16 colour 16x8 bobs just manage to run at full speed on my
- ;A1200+FAST, change the value if you have a faster machine (600 can be very
- ;interesting :-).
- ;
- ;Technical notes
- ;---------------
- ;This demo takes direct advantage of some special GMS blitting features,
- ;such as restorelist clearing without masks (gain: 10%), and 16 pixel
- ;alignment (gain: 15%). That allows us to have 25% more BOB's on screen!
- ;
- ;The fact that GMS will use the CPU to draw and clear images when the blitter
- ;is busy gives a boost of about 20%+ on an '020, so the overall advantage
- ;over a bog standard blitting function (eg BltBitmap()) is at least 40%.
- ;Given that such a function would have to be called 120 times with newly
- ;calculated parameters each time to draw, and 120 times to do the clears, we
- ;are probably looking at least 65% faster... is that good enough?
-
- INCDIR "INCLUDES:"
- INCLUDE "dpkernel/dpkernel.i"
-
- MAX_IMAGES = 120
-
- SECTION "Demo",CODE
-
- ;===========================================================================;
- ; INITIALISE DEMO
- ;===========================================================================;
-
- STARTDPK
-
- Start: MOVEM.L A0-A6/D1-D7,-(SP)
- move.l DPKBase(pc),a6
- lea TAGS_BobsPicture(pc),a0
- sub.l a1,a1
- CALL Init
- tst.l d0
- beq.s .Exit
-
- move.l PIC_Bobs(pc),a1
- move.l a1,RainPic
- move.l PIC_Bitmap(a1),a2
- move.l BMP_Palette(a2),GPalette
-
- lea ScreenTags(pc),a0
- sub.l a1,a1
- CALL Init
- move.l d0,Screen
- beq.s .Exit
-
- lea RestoreTags(pc),a0
- move.l Screen(pc),a1 ;a1 = Screen.
- CALL Init ;>> = Initialise the restore list.
- tst.l d0 ;d0 = Check for errors.
- beq.s .Exit ;>> = Error, exit.
-
- lea TAGS_RainBob(pc),a0
- move.l Screen(pc),a1
- move.l GS_Bitmap(a1),a1
- CALL Init ;>> = Initialise the Bob.
- tst.l d0
- beq.s .Exit
-
- moveq #ID_JOYDATA,d0 ;Get joydata structure.
- CALL Get
- move.l d0,JoyData
- beq.s .Exit
- move.l d0,a0 ;Initialise the joydata structure.
- sub.l a1,a1
- CALL Init
- tst.l d0
- beq.s .Exit
-
- move.l Screen(pc),a0
- CALL Display
-
- bsr.s Main
-
- .Exit move.l DPKBase(pc),a6
- move.l JoyData(pc),a0
- CALL Free
- move.l MBOB_Rain(pc),a0
- CALL Free
- move.l Restore(pc),a0
- CALL Free
- move.l Screen(pc),a0
- CALL Free
- move.l PIC_Bobs(pc),a0
- CALL Free
- MOVEM.L (SP)+,A0-A6/D1-D7
- moveq #ERR_OK,d0
- rts
-
- ;===========================================================================;
- ; DEMO CODE
- ;===========================================================================;
-
- Main: moveq #$00,d7
- move.l MBOB_Rain(pc),a1
-
- move.l Screen(pc),a0 ;a0 = Screen.
- move.l MB_EntryList(a1),a2 ;a2 = First entry.
- move.w MB_AmtEntries(a1),d2
- subq.w #1,d2
- .create bsr RegenerateBob
-
- move.l DPKBase(pc),a6
- move.w GS_Height(a0),d1
- CALL FastRandom
- move.w d0,BE_YCoord(a2)
-
- lea NBE_SIZEOF(a2),a2
- dbra d2,.create
-
- ;---------------------------------------------------------------------------;
- ; MAIN LOOP
- ;---------------------------------------------------------------------------;
-
- Loop: move.l Screen(pc),a0 ;a0 = Screen.
- move.l MBOB_Rain(pc),a1
- addq.w #1,d7
- move.l MB_EntryList(a1),a2 ;a2 = First entry.
- move.w MB_AmtEntries(a1),d2
- subq.w #1,d2
- .update bsr.s UpdateBob
- lea NBE_SIZEOF(a2),a2
- dbra d2,.update
-
- move.l DPKBase(pc),a6
- move.l Restore(pc),a0
- CALL Activate
-
- move.l MBOB_Rain(pc),a0 ;a0 = Bob to draw.
- CALL Draw ;>> = Draw the mbob.
-
- move.l SCRBase(pc),a6
- CALL scrWaitAVBL
-
- move.l Screen(pc),a0
- CALL scrSwapBuffers
-
- move.l DPKBase(pc),a6
- move.l JoyData(pc),a0
- CALL Query
- move.l JoyData(pc),a0
- move.l JD_Buttons(a0),d0
- btst #JB_LMB,d0
- beq.s Loop
- rts
-
- ;===========================================================================;
- ; UPDATE A BOB
- ;===========================================================================;
- ;Function: Moves the entity according to its internal settings.
- ;Requires: a1 = Bob structure.
- ; a2 = Entry to update.
-
- UpdateBob:
- move.w BE_YCoord(a2),d0 ;d0 = YCoord
- add.w BE_Speed(a2),d0 ;d0 = (YCoord)+YSpeed
- cmp.w GS_Height(a0),d0
- blt.s .YOkay
- bsr RegenerateBob
- bra.s .Animate
- .YOkay move.w d0,BE_YCoord(a2)
-
- .Animate
- tst.w BE_Locked(a2)
- beq.s .exit
- move.w d7,d6
- and.w #%00000011,d6
- bne.s .exit
- move.w BE_FChange(a2),d1
- bgt.s .Positive
-
- .Negative
- cmp.w #1,BE_Set(a2)
- bgt.s .NBlue
- beq.s .NGreen
- .NRed add.w d1,BE_Frame(a2)
- tst BE_Frame(a2)
- bge.s .exit
- move.w #1,BE_FChange(a2)
- clr.w BE_Frame(a2)
- rts
- .NGreen add.w d1,BE_Frame(a2)
- cmp.w #4,BE_Frame(a2)
- bge.s .done
- move.w #1,BE_FChange(a2)
- move.w #4,BE_Frame(a2)
- rts
- .NBlue add.w d1,BE_Frame(a2)
- cmp.w #8,BE_Frame(a2)
- bge.s .done
- move.w #1,BE_FChange(a2)
- move.w #8,BE_Frame(a2)
- .exit rts
-
- .Positive
- cmp.w #1,BE_Set(a2)
- bgt.s .PBlue
- beq.s .PGreen
- .PRed add.w d1,BE_Frame(a2)
- cmp.w #3,BE_Frame(a2)
- ble.s .done
- move.w #-1,BE_FChange(a2)
- move.w #2,BE_Frame(a2)
- rts
- .PGreen add.w d1,BE_Frame(a2)
- cmp.w #7,BE_Frame(a2)
- ble.s .done
- move.w #-1,BE_FChange(a2)
- move.w #6,BE_Frame(a2)
- rts
- .PBlue add.w d1,BE_Frame(a2)
- cmp.w #11,BE_Frame(a2)
- ble.s .done
- move.w #-1,BE_FChange(a2)
- move.w #10,BE_Frame(a2)
- .done rts
-
- ;===========================================================================;
- ; REGENERATE BOB ENTITY
- ;===========================================================================;
- ;Function: Regenerates an entity with completely new data.
- ;Requires: a2 = Entry to update.
-
- RegenerateBob:
- move.l DPKBase(pc),a6
- move.w GS_Width(a0),d1
- CALL FastRandom
- subq.w #4,d0
- and.w #%1111111111111000,d0
- move.w d0,BE_XCoord(a2)
-
- moveq #8,d1
- CALL FastRandom
- addq.w #2,d0
- move.w d0,BE_Speed(a2)
-
- moveq #12,d1
- CALL FastRandom
- move.w d0,BE_Frame(a2)
- move.b .Sets(pc,d0.w),BE_Set+1(a2)
-
- move.w #-8,BE_YCoord(a2)
- move.w #1,BE_FChange(a2)
- eor.w #1,BE_Locked(a2)
- rts
-
- .Sets dc.b 0,0,0,0
- dc.b 1,1,1,1
- dc.b 2,2,2,2
-
- ;===========================================================================;
- ; DATA
- ;===========================================================================;
-
- JoyData: dc.l 0
-
- RestoreTags: dc.l TAGS_RESTORE
- Restore: dc.l 0
- dc.l RSA_Entries,MAX_IMAGES
- dc.l TAGEND
-
- ;---------------------------------------------------------------------------;
-
- ScreenTags: dc.l TAGS_SCREEN
- Screen: dc.l 0
- dc.l GSA_Attrib,SCR_DBLBUFFER
- dc.l GSA_BitmapTags,0
- dc.l BMA_Palette
- GPalette: dc.l 0
- dc.l TAGEND,0
- dc.l TAGEND
-
- ;---------------------------------------------------------------------------;
-
- TAGS_BobsPicture:
- dc.l TAGS_PICTURE
- PIC_Bobs: dc.l 0
- dc.l PCA_BitmapTags,0
- dc.l BMA_MemType,MEM_VIDEO
- dc.l TAGEND,0
- dc.l PCA_Source,.filename
- dc.l TAGEND
-
- .filename FILENAME "GMS:demos/data/PIC.Pulse"
-
- ;---------------------------------------------------------------------------;
-
- ;This is a mutated entrylist that we use for the raining bobs.
-
- STRUCTURE NBE,BE_SIZEOF
- WORD BE_Speed ;Speed of this particular bob.
- WORD BE_Set ;0 = Red, 1 = Green, 2 = Blue.
- WORD BE_FChange
- WORD BE_Locked ;Is it animated or not.
- LABEL NBE_SIZEOF
-
- TAGS_RainBob: dc.l TAGS_MBOB
- MBOB_Rain: dc.l 0
- dc.l MBA_AmtEntries,MAX_IMAGES
- dc.l MBA_GfxCoords,RainFrames
- dc.l MBA_Width,8
- dc.l MBA_Height,8
- dc.l MBA_EntryList,Images
- dc.l MBA_Attrib,BBF_CLIP|BBF_GENMASKS|BBF_CLEAR|BBF_CLRNOMASK
- dc.l MBA_Source
- RainPic: dc.l 0
- dc.l MBA_EntrySize,NBE_SIZEOF
- dc.l TAGEND
-
- RainFrames: dc.w 0,8*0 ;RED
- dc.w 0,8*1
- dc.w 0,8*2
- dc.w 0,8*3
- dc.w 8,8*0 ;GREEN
- dc.w 8,8*1
- dc.w 8,8*2
- dc.w 8,8*3
- dc.w 16,8*0 ;BLUE
- dc.w 16,8*1
- dc.w 16,8*2
- dc.w 16,8*3
- dc.l -1
-
- ;---------------------------------------------------------------------------;
-
- SECTION Images,BSS
-
- Images: ds.b NBE_SIZEOF*MAX_IMAGES ;X/Y/Frame/Speed/Set/FChange/Locked
-
- ;===========================================================================;
-
- ProgName: dc.b "Raining Bobs",0
- ProgAuthor: dc.b "Paul Manias",0
- ProgDate: dc.b "May 1998",0
- ProgCopyright: dc.b "DreamWorld Productions (c) 1996-1998. Freely distributable.",0
- ProgShort: dc.b "Multiple bobs demonstration.",0
- even
-
-