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- ;-------T-------T------------------------T----------------------------------;
- ;Scroll Screen
- ;-------------
- ;This demo allows you to legally scroll 100 screens to the right by setting
- ;the SBUFFER flag. What we are supposed to really do is blit blocks down
- ;the sides of the screen so that we have the illusion of a really large page
- ;size. You can see this working in the MapEditor.s demo.
-
- INCDIR "INCLUDES:"
- INCLUDE "exec/exec_lib.i"
- INCLUDE "games/games_lib.i"
- INCLUDE "games/games.i"
-
- CALL MACRO
- jsr _LVO\1(a6)
- ENDM
-
- SECTION "ScrollScreen",CODE
-
- ;===========================================================================;
- ; INITIALISE DEMO
- ;===========================================================================;
-
- Start: MOVEM.L A0-A6/D1-D7,-(SP)
- move.l ($4).w,a6
- lea GMS_Name(pc),a1
- moveq #$00,d0
- CALL OpenLibrary
- move.l d0,GMS_Base
- beq.s .Error_GMS
-
- move.l GMS_Base(pc),a6
- sub.l a0,a0
- CALL SetUserPrefs
-
- lea Screen(pc),a0
- CALL AddScreen
- tst.l d0
- bne.s .Error_Screen
-
- lea Picture(pc),a1
- move.l GS_MemPtr1(a0),PIC_Data(a1)
- CALL LoadPic
- tst.w d0
- bne.s .Error_Picture
-
- move.l PIC_Palette(a1),GS_Palette(a0)
- CALL UpdatePalette
-
- CALL ShowScreen
- CALL InitJoyPorts
-
- bsr.s Main
-
- .ReturnToDOS
- move.l GMS_Base(pc),a6
- lea Picture(pc),a1
- CALL FreePic
- .Error_Picture
- move.l GMS_Base(pc),a6
- lea Screen(pc),a0
- CALL DeleteScreen
- .Error_Screen
- move.l GMS_Base(pc),a1
- move.l ($4).w,a6
- CALL CloseLibrary
- .Error_GMS
- MOVEM.L (SP)+,A0-A6/D1-D7
- moveq #$00,d0
- rts
-
- ;===========================================================================;
- ; MAIN LOOP
- ;===========================================================================;
-
- Main: moveq #JPORT1,d0
- CALL ReadMouse
- btst #MB_LMB,d0
- bne.s .done
- asr.w #8,d0 ;d0 = X Change
- add.w d0,GS_PicXOffset(a0)
- CALL MovePicture
- CALL WaitSVBL
- bra.s Main
- .done rts
-
- ;===========================================================================;
- ; DATA
- ;===========================================================================;
-
- GMS_Name:
- dc.b "games.library",0
- even
- GMS_Base:
- dc.l 0
-
- AMT_PLANES = 5
-
- Screen: dc.l GSV1,0 ;Version header.
- dc.l 0,0,0 ;Screen memory 1/2/3.
- dc.l 0 ;Screen link.
- dc.l 0 ;Address of palette.
- dc.l 0 ;Address of rasterlist.
- dc.l 0 ;Amount of colours in palette.
- dc.w 320,256 ;Screen Width, Height.
- dc.w 320,320/8,256 ;Picture Widths, Height.
- dc.w AMT_PLANES ;Amount of planes
- dc.w 0,0 ;X/Y Screen offset.
- dc.w 0,0 ;X/Y Picture offset.
- dc.l HSCROLL|SBUFFER ;Special attributes.
- dc.w LORES|COL12BIT ;Screen mode.
- dc.w ILBM ;Screen type
-
- Picture dc.l PCV1,0 ;Version header.
- dc.l 0 ;Source data.
- dc.w 320,320/8,256 ;Width, Height.
- dc.w AMT_PLANES ;Amount of Planes.
- dc.l 32 ;Amount of colours.
- dc.l 0 ;Source palette.
- dc.w LORES|COL12BIT ;Screen mode.
- dc.w INTERLEAVED ;Destination
- dc.l GETPALETTE ;Parameters.
- dc.l .File
- .File dc.b "GAMESLIB:data/IFF.Pic320",0
- even
-