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- ;-------T-------T------------------------T----------------------------------;
- ;Colour List Example
- ;-------------------
- ;Colourlists are those nice colour gradients used in demos and games,
- ;usually sitting in the background of your screen. Colourlists are mostly
- ;good for getting more colours on screen than what there really is.
- ;Although GMS allows you to do other screen effects based on raster lines,
- ;we'll just stick to changing colours in this demo.
- ;
- ;You can move the green colour bar by moving the joystick up and down.
- ;You will notice that if you move the green bar into the upper red bar,
- ;your bar will disappear. This is because:
- ;
- ; WAITLINE 95 ;Wait for line 95
- ; WAITLINE 100 ;Wait for line 100
- ; WAITLINE 90 ;Wait for line 90 <--Error!
- ;
- ;Is not allowed. The monitor beam travels down the screen, and so the
- ;UpdateRasterlist() routine will expect all lines to be in sequential order.
- ;Moving two colourbars into each other breaks this rule, causing the wait
- ;command to be ignored. If you want to get around this, you will have to
- ;have just one large colourlist and sort your colours before each call to
- ;UpdateRasterlist().
- ;
- ;Similarly if you move the colour bar too far down the screen the hardware
- ;won't like it because lines > 311 don't exist. It's up to you to be
- ;responsible enough to stop this from happening!
- ;
- ;Press FIRE to exit the demo.
-
- INCDIR "INCLUDES:"
- INCLUDE "games/games_lib.i"
- INCLUDE "games/games.i"
-
- CALL MACRO
- jsr _LVO\1(a6)
- ENDM
-
- ;===========================================================================;
- ; INITIALISE DEMO
- ;===========================================================================;
-
- SECTION "Colourlist",CODE
-
- STARTGMS
-
- Start: MOVEM.L A0-A6/D1-D7,-(SP)
- move.l GMSBase(pc),a6
- lea ScreenTags(pc),a0
- CALL ShowScreen
- tst.l d0
- beq.s .Error_Screen
-
- CALL InitJoyPorts
-
- bsr.s Loop
-
- .ReturnToDOS
- move.l GMSBase(pc),a6
- move.l Screen(pc),a0
- CALL DeleteScreen
- .Error_Screen
- MOVEM.L (SP)+,A0-A6/D1-D7
- moveq #ERR_OK,d0
- rts
-
- ;===========================================================================;
- ; MAIN LOOP
- ;===========================================================================;
-
- Loop: move.l Screen(pc),a0
- moveq #JPORT1,d0
- CALL ReadMouse
- btst #MB_LMB,d0
- bne.s .done
- ext.w d0
- lea Bar2(pc),a1
- add.w d0,2(a1)
- .chkhi cmp.w #226,2(a1)
- blt.s .chklo
- move.w #226,2(a1)
- .chklo tst.w 2(a1)
- bgt.s .update
- clr.w 2(a1)
- .update CALL UpdateRasterLines ;Update our rasterlist.
- CALL WaitVBL
- bra.s Loop
- .done rts
-
- ;===========================================================================;
- ; DATA
- ;===========================================================================;
-
- ScreenTags:
- dc.l TAGS_GAMESCREEN
- Screen: dc.l 0
- dc.l GSA_Rasterlist,Rasterlist
- dc.l GSA_Planes,1
- dc.l GSA_Attrib,BLKBDR
- dc.l TAGEND
-
- ;===========================================================================;
-
- RasterList:
- Bar1: COLOURLIST 000,3,00,ColourBar1 ;Line, Skip, Colnum, ColourList.
- Bar2: COLOURLIST 160,1,00,ColourBar2 ;Line, Skip, Colnum, ColourList.
- COLOURLIST 230,1,00,ColourBar3 ;Line, Skip, Colnum, ColourList.
- RASTEND
-
- ColourBar1:
- dc.l $100000,$200000,$300000,$400000,$500000
- dc.l $600000,$700000,$800000,$900000,$a00000
- dc.l $b00000,$c00000,$d00000,$e00000,$e00000
- dc.l $e00000,$d00000,$c00000,$b00000,$a00000
- dc.l $900000,$800000,$700000,$600000,$500000
- dc.l $400000,$300000,$200000,$100000,$000000
- dc.l -1
-
- ColourBar2:
- dc.l $001000,$002000,$003000,$004000,$005000
- dc.l $006000,$007000,$008000,$009000,$00a000
- dc.l $00b000,$00c000,$00d000,$00e000,$00f000
- dc.l $00e000,$00d000,$00c000,$00b000,$00a000
- dc.l $009000,$008000,$007000,$006000,$005000
- dc.l $004000,$003000,$002000,$001000,$000000
- dc.l -1
-
- ColourBar3:
- dc.l $000010,$000020,$000030,$000040,$000050
- dc.l $000060,$000070,$000080,$000090,$0000a0
- dc.l $0000b0,$0000c0,$0000d0,$0000e0,$0000f0
- dc.l $0000e0,$0000d0,$0000c0,$0000b0,$0000a0
- dc.l $000090,$000080,$000070,$000060,$000050
- dc.l $000040,$000030,$000020,$000010,$000000
- dc.l -1
-
-