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- ;-------T-------T------------------------T----------------------------------;
- ;Load Picture
- ;------------
- ;This demo will load in a picture of any size/type and if it is larger than
- ;the screen width, it scrolls left and right. This is easily possible due
- ;to the fact that GMS likes to fill in fields that have been set at zero
- ;on initialisation, which is great for loading/displaying things like
- ;pictures.
- ;
- ;The benefits of this will become more apparent when you want to do things
- ;like changing your graphics format from ECS to AGA and vice versa. The
- ;benefits for the user are enormous (full graphical editing capabilities,
- ;if you program correctly). And you don't even need to change a line of
- ;code! Wow!
-
- INCDIR "INCLUDES:"
- INCLUDE "exec/exec_lib.i"
- INCLUDE "games/games_lib.i"
- INCLUDE "games/games.i"
-
- CALL MACRO
- jsr _LVO\1(a6)
- ENDM
-
- SPEED = 2
-
- SECTION "LoadPicture",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 Picture(pc),a1 ;Load picture into background.
- CALL GetPicInfo
- tst.w d0
- bne.s .Error_Picture
- lea Screen(pc),a0
- move.w PIC_Planes(a1),GS_Planes(a0)
- move.w PIC_Width(a1),GS_PicWidth(a0)
- move.w PIC_Height(a1),GS_PicHeight(a0)
- move.l PIC_AmtColours(a1),GS_AmtColours(a0)
- move.w PIC_ScrMode(a1),GS_ScrMode(a0)
- move.w PIC_ScrType(a1),GS_ScrType(a0)
-
- CALL AddScreen
- tst.l d0
- bne.s .Error_Screen
-
- move.l GS_MemPtr1(a0),PIC_Data(a1)
- CALL LoadPic
-
- CALL ShowScreen
-
- bsr.s Main ;Go and do the main routine.
-
- .ReturnToDOS
- move.l GMS_Base(pc),a6
- lea Screen(pc),a0
- CALL DeleteScreen
- .Error_Screen
- lea Picture(pc),a1
- CALL FreePic
- .Error_Picture
- move.l ($4).w,a6
- move.l GMS_Base(pc),a1
- CALL CloseLibrary
- .Error_GMS
- MOVEM.L (SP)+,A0-A6/D1-D7
- moveq #$00,d0
- rts
-
- ;===========================================================================;
- ; MAIN LOOP
- ;===========================================================================;
-
- Main: move.l GMS_Base(pc),a6
- lea Screen(pc),a0
- lea Picture(pc),a2
-
- moveq #0,d0 ;d0 = Initialise fader.
- moveq #2,d1 ;d1 = Speed of fade.
- move.l PIC_Palette(a2),a1
- moveq #$000000,d2
- moveq #0,d3
- move.l PIC_AmtColours(a2),d4
- .Fade1 CALL WaitSVBL
- CALL ColourToPalette ;Do the fade routine.
- tst.w d0 ;Has the fade finished yet?
- bne.s .Fade1 ;If not, keep doing it.
-
- lea Picture(pc),a1
- moveq #0,d2
- .loop CALL WaitSVBL
- move.w GS_ScrWidth(a0),d0 ;Only scroll the picture if is is
- lsr.w #3,d0 ;bigger than the actual screen.
- cmp.w GS_PicWidth(a0),d0
- bge.s .done
-
- tst.w d2
- bgt.s .Right
- .Left tst.w GS_PicXOffset(a0)
- ble.s .RRight
- .RLeft moveq #-SPEED,d2
- bra.s .scroll
- .Right move.w GS_PicWidth(a0),d0 ;d0 = PicWidth.
- sub.w #320,d0
- cmp.w GS_PicXOffset(a0),d0 ;d0 = Is (Width-320 < PicOffset)?
- ble.s .RLeft
- .RRight moveq #SPEED,d2
- .scroll add.w d2,GS_PicXOffset(a0)
- CALL MovePicture
-
- .done moveq #JPORT1,d0 ;Port 1 (Mouse)
- moveq #JT_ZBXY,d1
- CALL ReadJoyPort
- btst #MB_LMB,d0
- beq.s .loop
- rts
-
- ;===========================================================================;
- ; DATA
- ;===========================================================================;
-
- GMS_Name:
- dc.b "games.library",0
- even
- GMS_Base:
- dc.l 0
-
- 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 0,0 ;Screen Width, Height.
- dc.w 0,0,0 ;Picture Widths, Height.
- dc.w 0 ;Amount of planes.
- dc.w 0,0 ;Screen X/Y offset.
- dc.w 0,0 ;Picture X/Y offset.
- dc.l HSCROLL ;Special attributes.
- dc.w 0 ;Screen mode.
- dc.w 0 ;Screen type
-
- Picture dc.l PCV1,0 ;Version header.
- dc.l 0 ;Source data.
- dc.w 0,0,0 ;Width/8, Height.
- dc.w 0 ;Amount of Planes.
- dc.l 0 ;Amount of colours.
- dc.l 0 ;Palette.
- dc.w 0 ;Screen mode.
- dc.w 0 ;Screen type.
- dc.l VIDEOMEM|GETPALETTE|GETVMODE
- dc.l .File
- .File dc.b "GAMESLIB:data/IFF.Pic640x256",0
- even
-