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- ;-------T-------T------------------------T----------------------------------;
- ;Double Buffering
- ;----------------
- ;This just shows how to double buffer the screen. You can also try out
- ;triple buffering just by changing the DBLBUFFER flag to TPLBUFFER in the
- ;GameScreen.
-
- INCDIR "INCLUDES:"
- INCLUDE "exec/exec_lib.i"
- INCLUDE "games/games_lib.i"
- INCLUDE "games/games.i"
-
- CALL MACRO
- jsr _LVO\1(a6)
- ENDM
-
- SECTION "DoubleBuffer",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 ;Add screen for use.
- CALL AddScreen
- tst.l d0
- bne.s .Error_Screen
-
- lea Picture(pc),a1 ;Load background picture.
- 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
-
- bsr.s Main
-
- .ReturnToDOS
- move.l GMS_Base(pc),a6
- lea Picture(pc),a1
- CALL FreePic
- .Error_Picture
- lea Screen(pc),a0
- CALL DeleteScreen ;Give back screen memory etc.
- .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: CALL WaitSVBL ;Nice VBL wait for multi-tasking.
- CALL SwapBuffers
- moveq #JPORT1,d0
- moveq #JT_ZBXY,d1
- CALL ReadJoyPort
- btst #MB_LMB,d0
- beq.s Main
- rts
-
- ;===========================================================================;
- ; DATA
- ;===========================================================================;
-
- GMS_Name:
- dc.b "games.library",0
- even
- GMS_Base:
- dc.l 0
-
- AMT_PLANES = 5
-
- Screen: dc.l GSV1,0 ;Structure Version.
- dc.l 0,0,0 ;Screen Memory 1/2/3.
- dc.l 0 ;Screen link.
- dc.l 0 ;Address of screen palette
- dc.l 0 ;Address of rasterlist.
- dc.l 0 ;Amt of colours in palette.
- dc.w 320,256 ;Screen Width and Height.
- dc.w 0,0,0 ;Picture Width, ByteWidth, Height.
- dc.w AMT_PLANES ;Amt of planes
- dc.w 0,0 ;X/Y screen offset
- dc.w 0,0 ;X/Y picture offset
- dc.l DBLBUFFER ;Special attributes.
- dc.w LORES|COL12BIT ;Screen mode.
- dc.w PLANAR ;Screen type
- even
-
- 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 (remap).
- dc.w LORES|COL12BIT ;Screen mode.
- dc.w PLANAR ;Screen type.
- dc.l GETPALETTE ;Parameters.
- dc.l .File
- .File dc.b "GAMESLIB:data/IFF.Pic320",0
- even
-