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25 April 2021, 14:19
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#1 |
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Prototron
Join Date: Mar 2015
Location: Glasgow, Scotland
Posts: 411
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Hidden margins either side of screen
Hi folks! Apologies for the influx of noob questions, but I'm on week 2 of my Amiga assembly adventures, and I'm really stuck on this problem.
I'm trying to set up my 320x244 PAL display so that it has 16 pixels (for now) of hidden space either side (in the borders, so to speak), but I can't seem to understand the description in the HRM. I looked at some similar forum posts, and I thought I had a grip on it, but it's not happening, so any corrections to my list of what I'm doing would be great. - DIWSTART/DIWSTOP: $3b81/$1b1C (From what I understand...) - DDFSTART/DDFSTOP: $38/$D0 (...these remain unchanged) - Screen Mem Width: 352 (Account for extra 16 pixels either side) - Bitplane Pointers: +2 (+16 Pixels on LEFT) - Screen Modulos(s): +4 (+32 pixels overall) - Blitter D Modulo: +4 (display image correctly over larger area) I've tried variations on these settings, but I'm getting nowhere, so any help would be great. I really tried to solve this issue without resorting to asking on here, so again apologies. Code and test image below (if needed): Test image: https://drive.google.com/file/d/1Sch...ew?usp=sharing Code:
ORG $20000 SECTION code,CODE ;------------------------------------------------------------------------------------------------------------ ; -- CALL INIT SUBS -- ;-----------------------------------------------------------------------------------------------; jsr INIT jsr BLIT ; Initial blit of image ;------------------------------------------------------------------------------------------------------------ ; MAIN LOOP ;------------------------------------------------------------------------------------------------------------ MAIN_LOOP: jsr JOYSTICK_READER jsr P1_CONTROLS jsr VBLANK jmp MAIN_LOOP ; -- MAIN LOOP END / EXIT -- EXIT: ;------------------------------------------------------------------------------------------------------- ; SUBROUTINES ;------------------------------------------------------------------------------------------------------- ; -- SCREEN CONSTANTS -- INIT: SCR_W = 352 ; Display Window WIDTH SCR_H = 224 SCR_BPL = SCR_W/8 SCR_BPLSIZE = SCR_BPL*SCR_H SCR_B_WIDTH = SCR_BPL*4 SCR_MODULO = SCR_BPL*3 ; -- BLITTER CONSTANTS (Old) -- ;bltX = 0 ;bltY = 0 ; SCR_B_WIDTH already mul by 4 ;bltOffs = (bltY*SCR_B_WIDTH)+(bltX/8) ;blt_height = 93 ;blt_widthV = 96 ;blt_width = blt_widthV/16 ;blt_modu = (SCR_W-blt_widthV)/8 ;blt_brcorner = (blt_height-1)*SCR_BPL+blt_widthV*2-2 ; -- Turn off the Amiga Operating System -- OSoff: move.l 4.w,a6 ; Execbase clr.l d0 move.l #GFXNAME,a1 jsr -408(a6) ; oldopenlibrary() move.l d0,a1 move.l 38(a1),d4 ; Original copper ptr jsr -414(a6) ; Closelibrary() ; -- Enable/Disable relebant bits in registers -- EnaDis: move.w $dff01c,d5 move.w $dff002,d3 move.w #%1000000000000000,$dff096 ; Set relevant bits in DMACON - dff096 move.w #%0111111111111111,$dff09a ; Disable all bits in INTENA - dff09a move.w #%0111111111111111,$dff09c ; Disable all bits in INTENAQ - dff09c CopperInit: ;----------------------------------- ; BITPLANE POINTERS POKE ;----------------------------------- lea SCREEN+2,a0 ; Pointer to first bitplne of screen (+2 for hidden area) lea CoBplPr,a1 ; Where to poke the bitplane pointer words. moveq #4-1,d0 ; Loop Counter .bpl_loop: move.l a0,d1 swap d1 move.w d1,2(a1) ; High word swap d1 move.w d1,6(a1) ; Low word addq #8,a1 ; Point to next bpl to poke in copper lea SCR_BPL(a0),a0 ; interleaved bitmap (see BPLxMOD in copperlist) dbf d0,.bpl_loop ;----------------------------------- ; SET COPPER LIST ;----------------------------------- SetCopper: move.l #COPPER,$dff080 ;COP1LCH rts ; ---------------------------------------------------------------------------------------------------------- ; WAIT FOR VERTICAL BLANK ; ---------------------------------------------------------------------------------------------------------- VBLANK: .loop move.l $dff004,d0 and.l #$1ff00,d0 cmp.l #$12c00,d0 bne.b .loop rts ; ---------------------------------------------------------------------------------------------------------- ; BLITTER / DRAW ; ---------------------------------------------------------------------------------------------------------- BLIT: movem.l d0-a6,-(sp) lea FRAME,a1 ; Base address for graphics frame to be blitted lea SCREEN,a2 ; Base address for Screen to be written to ; -- CALCULATE X/Y OFFSET -- ;bltOffs = (bltY*SCR_B_WIDTH)+(bltX/8) moveq #0,d1 moveq #0,d2 moveq #0,d3 move.b (P1TABLE),d1 ; X-Coordinate (Words) move.b (P1TABLE+1),d2 ; Y-Coordinate (Lines) +1 Offset in Table move.b #SCR_B_WIDTH,d3 mulu d2,d3 divu #8,d1 add d3,d1 add d1,a2 ; -- CALCULATE WIDTH & HEGHT -- ;move.w #blt_height*4*64+blt_width,$058(a6) ; BLTSIZE - Size of Rectangle moveq #0,d4 moveq #0,d5 move.b (P1TABLE+4),d4 ; Height mulu #4,d4 mulu #64,d4 move.b (P1TABLE+3),d5 ; Width divu #16,d5 add d4,d5 ;-- DESTINATION MODULO -- ;blt_modu = (SCR_W-blt_widthV)/8 moveq #0,d0 moveq #0,d6 move.w #SCR_W,d0 move.b (P1TABLE+3),d6 sub d6,d0 divu #8,d0 add #4,d0 ; Add 4 for extra hidden screen areas ; PASTE BACKGROUND ; bsr WAITFORBLITTER ; move.l #$09f00000,$040(a6) ; BLTCON0 - Set Blitter Control bits ; move.l #$ffffffff,$044(a6) ; BLTAFWM - Set Source Mask ; move.l #$ffffffff,$046(a6) ; BLTALWM - Set Source Mask ; move.l #0,$050(a6) ; BLTAPTH - Source (A) pointer - MASK ; move.l a2,$054(a6) ; BLTDPTH - Destination (D) pointer ; move.w #0,$064(a6) ; BLTAMOD - Source Modulo ; move.w d0,$066(a6) ; BLTDMOD - Destination Modulo ; move.w d5,$058(a6) ; BLTSIZE - Size of Rectangle ;-- COPY BACKGROUND -- ; bsr WAITFORBLITTER ; move.l #$09f00000,$040(a6) ; BLTCON0 - Set Blitter Control bits ; move.l #$ffff,$044(a6) ; BLTAFWM - Set Source Mask ; move.l #$f,$046(a6) ; BLTALWM - Set Source Mask ; move.l a2,$050(a6) ; BLTAPTH - Source (A) pointer - MASK ; move.l FRAMEBUFFER,$054(a6) ; BLTDPTH - Destination (D) pointer ; move.w #0,$064(a6) ; BLTAMOD - Source Modulo ; move.w d0,$066(a6) ; BLTDMOD - Destination Modulo ; move.w d5,$058(a6) ; BLTSIZE - Size of Rectangle ; -- BLIT SPRITE -- lea $dff000,a6 ; Custom Chip base address (a6) tst $002(a6) ; DMACONR bsr WAITFORBLITTER moveq #0,d7 move.b (P1TABLE+2),d7 lsl.l #8,d7 lsl.l #8,d7 lsl.l #8,d7 lsl.l #4,d7 move.l #$09f00000,d6 ; Set ASCENDING MODE (Shift RIGHT) or.l d7,d6 move.l d6,$040(a6) ; BLTCON0 - Set Blitter Control bits move.l #$ffffffff,$044(a6) ; BLTAFWM - Set Source Mask move.l #$ffffffff,$046(a6) ; BLTALWM - Set Source Mask ;move.l a1,$04c(a6) ; BLTAPTH - Source (C) pointer - ;move.l a1,$04c(a6) ; BLTAPTH - Source (B) pointer - IMAGE move.l a1,$050(a6) ; BLTAPTH - Source (A) pointer - MASK move.l a2,$054(a6) ; BLTDPTH - Destination (D) pointer move.w #0,$064(a6) ; BLTAMOD - Source Modulo move.w d0,$066(a6) ; BLTDMOD - Destination Modulo move.w d5,$058(a6) ; BLTSIZE - Size of Rectangle movem.l (sp)+,d0-a6 rts WAITFORBLITTER: .waitblit ; Wait for Blitter to finish btst #6,$002(a6) bne.s .waitblit rts ;---------------------------------------------------------------------------------------------- ; CONTROLS ;---------------------------------------------------------------------------------------------- ; BIT - ACTION ; --- - ------ ; 0 - UP ; 1 - DOWN ; 2 - LEFT ; 3 - RIGHT ; 4 - FIRE 1 ; 5 - FIRE 2 ; -------------- HSPEED = 2 VSPEED = 2 RLIMIT = 16 LLIMIT = 0 P1_CONTROLS: ;------------------------------------------ ; RIGHT ;------------------------------------------ .PLAYER1_MOVERIGHT: btst #3,d0 bne .PLAYER1_MOVELEFT bset #0,P1FLAGS btst #1,d0 ; Check if Diagoinal RIGHT-DOWN is pushed bne .NO_RD move.b (P1TABLE+1),d1 add #VSPEED,d1 move.b d1,(P1TABLE+1) .NO_RD btst #0,d0 ; Check if Diagoinal RIGHT-UP is pushed bne .NO_RU move.b (P1TABLE+1),d1 add #-VSPEED,d1 move.b d1,(P1TABLE+1) .NO_RU moveq #0,d1 move.b (P1TABLE+2),d1 ; Move RIGHT within frame shift ; If we are at 0 don't sub, but go to 16pxl WORD shift add #HSPEED,d1 move.b d1,(P1TABLE+2) cmp.b #RLIMIT,d1 blt .no_wordshiftR moveq #0,d1 move.b (P1TABLE),d1 ; Move frame RIGHT BY 16pxls add #16,d1 move.b d1,(P1TABLE) moveq #0,d1 ; Move LEFT within frame shift move.b d1,(P1TABLE+2) .no_wordshiftR jsr BLIT jmp .P1_CONTROLS_DONE ;------------------------------------------ ; LEFT ;------------------------------------------ .PLAYER1_MOVELEFT: btst #2,d0 bne .PLAYER1_MOVEDOWN bclr #0,P1FLAGS ; Set XFLIP to '0' (LEFT) btst #1,d0 ; Test for LEFT-DOWN bne .NO_LD move.b (P1TABLE+1),d1 add #VSPEED,d1 move.b d1,(P1TABLE+1) .NO_LD btst #0,d0 ; Test for LEFT-UP bne .NO_LU move.b (P1TABLE+1),d1 add #-VSPEED,d1 move.b d1,(P1TABLE+1) .NO_LU ;moveq #0,d2 ; Check for left screen Boundary ;move.b (P1TABLE),d2 ;cmp #0,d2 ;beq .no_wordshiftL moveq #0,d1 move.b (P1TABLE+2),d1 ; Move SHIFT left cmp.b #LLIMIT,d1 beq .goto_wordmoveL sub #HSPEED,d1 move.b d1,(P1TABLE+2) cmp.b #LLIMIT,d1 bgt .no_wordshiftL .goto_wordmoveL moveq #0,d1 move.b (P1TABLE),d1 ; Move FRAME left sub #16,d1 move.b d1,(P1TABLE) moveq #0,d1 move.b #15,d1 move.b d1,(P1TABLE+2) .no_wordshiftL jsr BLIT jmp .P1_CONTROLS_DONE .PLAYER1_MOVEDOWN moveq #0,d2 ; Check for bottom screen Boundary move.b (P1TABLE+1),d2 cmp #126,d2 bge .PLAYER1_MOVEUP btst #1,d0 bne .PLAYER1_MOVEUP move.b (P1TABLE+1),d1 add #VSPEED,d1 move.b d1,(P1TABLE+1) jsr BLIT jmp .P1_CONTROLS_DONE .PLAYER1_MOVEUP btst #0,d0 bne .P1_CONTROLS_DONE move.b (P1TABLE+1),d1 add #-VSPEED,d1 move.b d1,(P1TABLE+1) jsr BLIT jmp .P1_CONTROLS_DONE .P1_CONTROLS_DONE: rts ;------------------------------------------------------------------------------------------------------------ ; JOYSTICK ;----------------------------------------------------------------------------------------------- JOYSTICK_READER: ;---7654S321RLDU move.b #%00111111,$BFE201 ;Direction for port A (BFE001)...0=in 1=out...(For fire buttons) move.w $dff00A,d2 ;Joystick-mouse 0 data (vert,horiz) (Joy2) move.b $bfe001,d5 ;/FIR1 /FIR0 /RDY /TK0 /WPRO /CHNG /LED OVL rol.b #1,d5 ;Fire0 for joy 2 bsr Player_ReadControlsOne ;Process Joy2 move.l d0,-(sp) move.w $dff00c,d2 ;Joystick-mouse 1 data (vert,horiz) (Joy1) move.b $bfe001,d5 ;/FIR1 /FIR0 /RDY /TK0 /WPRO /CHNG /LED OVL bsr Player_ReadControlsOne ;Process Joy 1 move.l (sp)+,d1 rts Player_ReadControlsOne: ;Translate HV data into joystick values moveq #0,d0 moveq #0,d1 moveq #0,d3 moveq #0,d4 ; -- Get the 4 bits that are needed for the directions -- roxr.l #1,d2 ;bit 0 roxl.l #1,d3 roxr.l #1,d2 ;bit 1 roxl.l #1,d4 roxr.l #7,d2 ;bit 8 roxl.l #1,d0 and.l #1,d2 ;bit 9 ; -- Calculate the new directions -- move.b d2,d1 eor.b d0,d1 roxr.b d1 roxr.b d0 ;Up (Bit 9 Xor 8) move.b d4,d1 eor.b d3,d1 roxr.b d1 roxr.b d0 ;Down (Bit 1 Xor 0) roxr.b d2 roxr.b d0 ;Left (Bit 9) roxr.b d4 roxr.b d0 ;Right (Bit 1) roxl.b d5 roxr.b d0 ;Fire ror.b #3,d0 eor.b #%11101111,d0 ;Invert UDLR bits or.l #$FFFFFF00,d0 ;Set unused bits rts ;------------------------------------------------------------------------------------------------------------ ; DATA (COPPER, TABLES, GRAPHICS) ;----------------------------------------------------------------------------------------------------------- GFXNAME: dc.b "graphics.library",0 SECTION qq,DATA_C ; ----- COPPER --------------------------------------------------------------------------------------------- COPPER: ; -- DISPLAY SCREEN SIZE -- dc.w $1fc,0 dc.w $08E,$3b81 ; Display Screen Top Left (VVHH) dc.w $090,$1bc1 ; Display Screen Botom Right (VVHH) dc.w $092,$38 ; Display Bitplane Fetch Start (XXHH) dc.w $094,$d0 ; Display Bitplane Fetch Stop (XXHH) dc.w $100,%0100001000000001 ; BPLCON0 ;dc.w $102,%0000000011111111 ; BPLCON1 dc.w $106,%0000000000100000 ; BPLCON3 - Enable ECS Border Blanking dc.w $108,SCR_MODULO+4 ; Bitplane Modulo SCR_BPL*3 (odd planes) dc.w $10A,SCR_MODULO+4 ; Bitplane Modulo SCR_BPL*3 (even planes) ; -- BITPLANE POINTERS -- ; -- 4 Bitplanes -- CoBplPr: dc.w $0e0,0 ; Bitplane Pointer 1 (High 5 Bits) (ECS) dc.w $0e2,0 ; Bitplane Pointer 1 (Low 15 Bits) dc.w $0e4,0 ; Bitplane Pointer 2 (High 5 Bits) dc.w $0e6,0 ; Bitplane Pointer 2 (Low 15 Bits) dc.w $0e8,0 ; Bitplane Pointer 3 (High 5 Bits) dc.w $0ea,0 ; Bitplane Pointer 3 (Low 15 Bits) dc.w $0ec,0 ; Bitplane Pointer 4 (High 5 Bits) dc.w $0ee,0 ; Bitplane Pointer 4 (Low 15 Bits) SprPtr: dc.w $120,0 dc.w $122,0 dc.w $124,0 dc.w $126,0 dc.w $128,0 dc.w $12a,0 dc.w $12c,0 dc.w $12e,0 dc.w $120,0 dc.w $132,0 dc.w $134,0 dc.w $136,0 dc.w $138,0 dc.w $13a,0 dc.w $13c,0 dc.w $13e,0 ; -- PALETTE COLOURS -- ; PalDefs: dc.w $180,$0a00 ; Colour 0 dc.w $182,$0111 ; Colour 1 dc.w $184,$0620 ; Colour 2 dc.w $186,$0864 ; Colour 3 dc.w $188,$0A86 ; Colour 4 dc.w $18a,$0046 ; Colour 5 dc.w $18c,$00AC ; Colour 6 dc.w $18e,$08EE ; Colour 7 dc.w $190,$0A40 ; Colour 8 dc.w $192,$0E60 ; Colour 9 dc.w $194,$0EA0 ; Colour 10 dc.w $196,$0080 ; Colour 11 dc.w $198,$00C0 ; Colour 12 dc.w $19a,$0ECA ; Colour 13 dc.w $19c,$0CCC ; Colour 14 dc.w $19e,$0EEE ; Colour 15 ; -- COPPER END -- dc.w $ffff,$fffe ; COPPER END ;------------------------------------------------------------------------------------------------------------ ; FLAGS (WIP) ;------------------------------------------------------------------------------------------------------------ ; P1FLAGS ; -------- ; BIT - ACTION ; ------------ ; 0 - XFLIP ; 1 - ; 2 - ; 3 - ; 4 - ; 5 - ; 6 - DIE (Maybe) ; 7 - ACTIVE (Maybe) P1FLAGS: dc.b %00000001 ;------------------------------------------------------------------------------------------------------------ ; TABLES & VARIABLES (WIP) ;----------------------------------------------------------------------------------------------------------- ; ------------- ; BYTE - ACTION ; ------------- ; ; 0 - X ; 1 - Y ; 2 - S (Shift) ; 3 - Width ; 4 - Height ; 5 - State (Maybe) ; 6 - Energy (Maybe) ; 7 - Lives (Maybe) P1TABLE dc.b 16,16,0,96,93 ; X,Y,S,W,H EVEN FRAME: INCBIN "C:\Amiga\FFARES\TEST_IMAGE.RAW" FRAME_END: ;FRAMEBUFFER: ds.b 255 ;------------------------------------------------------------------------------------------------------------ ; BSS ;------------------------------------------------------------------------------------------------------------ SECTION BSS,BSS_C SCREEN: ds.w SCR_BPLSIZE SCREEN_END: END |
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25 April 2021, 16:07
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#2 |
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BiO-sanitation Battalion
Join Date: Jun 2017
Location: Scotland
Posts: 151
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The only things that you need to change are the bitplane modulo values to account for the extra four bytes of line width. All the other stuff can stay the same as for a normal 320 pixel wide screen.
B |
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25 April 2021, 17:48
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#3 | |
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Prototron
Join Date: Mar 2015
Location: Glasgow, Scotland
Posts: 411
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Quote:
Ok, I set the screen modulos to account for the extra bytes and left everything else the same, but it's not quite doing what I want. I even doubled the screen memory width to 640 and added 40 to the screen modulos, but it's not giving me any extra margins at the sides. Basically I'm looking to pseudo-clip the Bobs so that they can move on and off the screen without them wrapping around. This is so that enemies and the like can move on screen from beyond the borders etc. |
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25 April 2021, 18:26
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#4 | |
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Going nowhere
Join Date: Oct 2001
Location: United Kingdom
Age: 50
Posts: 8,986
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Quote:
Youre using sytem friendly code, but forcing your code to operate in a memory area that might not be free or safe. |
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25 April 2021, 18:37
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#5 | |
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BiO-sanitation Battalion
Join Date: Jun 2017
Location: Scotland
Posts: 151
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Quote:
The DDF and DIW start and stop values need to be set as you would for a normal 320 pixel screen. Something like this... Code:
move.w #$2c81,(DIWSTRT) ; normal start value is the same for NTSC or PAL move.w #$2cc1,(DIWSTOP) ; 256 lines tall for PAL move.w #$38,(DDFSTRT) ; move.w #$d0,(DDFSTOP) ; move.w #120,(BPL1MOD) ; using interleaved mode move.w #120,(BPL2MOD) move.w #$4200,(BPLCON0) ; 4 bitplanes selected, colour burst on move.w #0,(BPLCON1) ; no scroll If you're not using an interleaved arrangement, then the modulo would simply be a value of 4. I hope that's clear enough, this time.  B Last edited by Old_Bob; 25 April 2021 at 18:52. |
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25 April 2021, 20:05
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#6 | |
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Prototron
Join Date: Mar 2015
Location: Glasgow, Scotland
Posts: 411
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Quote:
There's obviously something wrong with my code, as I tried the exact suggestions you made but it's still not working for me. I can get the left hand side to clip the bob by increasing the Bitplane pointers starting address, but doing that makes the bob start wrapping a word early from the right hand border which is inside the visible screen. I've been bashing my head against a wall with this for a few days now, so I'm thinking there's something else I've overlooked which is stopping it from working. 
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25 April 2021, 21:46
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#7 |
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Registered User
Join Date: Jun 2016
Location: europe
Posts: 1,039
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OK, here it goes...
There are 3 bugs: 1. blit first/last word mask code also hits top word of C pointer 2. only 1 bitmap bitplane is allocated (again :P ) 3. blit D modulo is wrong (extra width included twice) Honorable mention: 4. screen is not cleared, added a few lines to handle that I didn't look at control/joystick stuff. I also changed a few other things. Some are generic optimizations (mostly mul/div replaced with shifts), some I find very annoying (missing .BWL :P ). Take them or leave them, they are there for educational purposes (not trying to be a dick). Code:
; ORG $20000 SECTION code,CODE ;------------------------------------------------------------------------------------------------------------ ; -- CALL INIT SUBS -- ;-----------------------------------------------------------------------------------------------; ; jsr INIT ; jsr BLIT ; Initial blit of image bsr.s INIT bsr.w BLIT ; Initial blit of image ;------------------------------------------------------------------------------------------------------------ ; MAIN LOOP ;------------------------------------------------------------------------------------------------------------ MAIN_LOOP: ; jsr JOYSTICK_READER ; jsr P1_CONTROLS ; jsr VBLANK bsr.w JOYSTICK_READER bsr.w P1_CONTROLS bsr.w VBLANK ; jmp MAIN_LOOP ; -- MAIN LOOP END / EXIT -- btst #6,$bfe001 ; left mouse button bne.s MAIN_LOOP EXIT: ;------------------------------------------------------------------------------------------------------- ; SUBROUTINES ;------------------------------------------------------------------------------------------------------- ; -- SCREEN CONSTANTS -- INIT: SCR_DEPTH = 4 ; interleaved bitmap ; full area SCR_W = 352 ; Display Window WIDTH SCR_H = 224 SCR_BPL = SCR_W/8 SCR_BPLSIZE = SCR_BPL*SCR_H SCR_B_WIDTH = SCR_BPL*SCR_DEPTH ; visible area (centered) VSCR_W = 320 VSCR_OFFSET = (SCR_W-VSCR_W)/2 SCR_MODULO = SCR_BPL*(SCR_DEPTH-1)+(SCR_W-VSCR_W)/8 ; -- BLITTER CONSTANTS (Old) -- ;bltX = 0 ;bltY = 0 ; SCR_B_WIDTH already mul by 4 ;bltOffs = (bltY*SCR_B_WIDTH)+(bltX/8) ;blt_height = 93 ;blt_widthV = 96 ;blt_width = blt_widthV/16 ;blt_modu = (SCR_W-blt_widthV)/8 ;blt_brcorner = (blt_height-1)*SCR_BPL+blt_widthV*2-2 ; -- Turn off the Amiga Operating System -- OSoff: move.l 4.w,a6 ; Execbase ; clr.l d0 ; move.l #GFXNAME,a1 moveq #0,d0 lea GFXNAME(pc),a1 jsr -408(a6) ; oldopenlibrary() move.l d0,a1 move.l 38(a1),d4 ; Original copper ptr jsr -414(a6) ; Closelibrary() ; -- Enable/Disable relebant bits in registers -- EnaDis: move.w $dff01c,d5 move.w $dff002,d3 ; move.w #%1000000000000000,$dff096 ; Set relevant bits in DMACON - dff096 move.w #%0111111111111111,$dff09a ; Disable all bits in INTENA - dff09a move.w #%0111111111111111,$dff09c ; Disable all bits in INTENAQ - dff09c ; order matters: disable interrupts first move.w #%1000000000000000,$dff096 ; Set relevant bits in DMACON - dff096 lea SCREEN,a0 moveq #0,d0 move.w #(SCREEN_END-SCREEN)/4-1,d1 ClrScreen: move.l d0,(a0)+ dbf d1,ClrScreen CopperInit: ;----------------------------------- ; BITPLANE POINTERS POKE ;----------------------------------- lea SCREEN+2,a0 ; Pointer to first bitplne of screen (+2 for hidden area) lea CoBplPr,a1 ; Where to poke the bitplane pointer words. ; moveq #4-1,d0 ; Loop Counter moveq #SCR_DEPTH-1,d0 ; Loop Counter .bpl_loop: move.l a0,d1 swap d1 move.w d1,2(a1) ; High word swap d1 move.w d1,6(a1) ; Low word ; addq #8,a1 ; Point to next bpl to poke in copper addq.l #8,a1 ; Point to next bpl to poke in copper lea SCR_BPL(a0),a0 ; interleaved bitmap (see BPLxMOD in copperlist) dbf d0,.bpl_loop ;----------------------------------- ; SET COPPER LIST ;----------------------------------- SetCopper: move.l #COPPER,$dff080 ;COP1LCH rts ; ---------------------------------------------------------------------------------------------------------- ; WAIT FOR VERTICAL BLANK ; ---------------------------------------------------------------------------------------------------------- VBLANK: .loop move.l $dff004,d0 and.l #$1ff00,d0 cmp.l #$12c00,d0 bne.b .loop rts ; ---------------------------------------------------------------------------------------------------------- ; BLITTER / DRAW ; ---------------------------------------------------------------------------------------------------------- BLIT: movem.l d0-a6,-(sp) lea FRAME,a1 ; Base address for graphics frame to be blitted lea SCREEN,a2 ; Base address for Screen to be written to ; -- CALCULATE X/Y OFFSET -- ;bltOffs = (bltY*SCR_B_WIDTH)+(bltX/8) moveq #0,d1 moveq #0,d2 ; moveq #0,d3 move.b (P1TABLE),d1 ; X-Coordinate (Words) move.b (P1TABLE+1),d2 ; Y-Coordinate (Lines) +1 Offset in Table ; move.b #SCR_B_WIDTH,d3 ; mulu d2,d3 ; divu #8,d1 ; add d3,d1 ; add d1,a2 add.w #VSCR_OFFSET,d1 ; skip left hidden area lsr.w #3,d1 add.w d1,a2 mulu.w #SCR_B_WIDTH,d2 add.l d2,a2 ; -- CALCULATE WIDTH & HEGHT -- ;move.w #blt_height*4*64+blt_width,$058(a6) ; BLTSIZE - Size of Rectangle moveq #0,d4 moveq #0,d5 move.b (P1TABLE+4),d4 ; Height ; mulu #4,d4 ; mulu #64,d4 lsl.w #2+6,d4 ; also mul by SCR_DEPTH move.b (P1TABLE+3),d5 ; Width ; divu #16,d5 lsr.w #4,d5 ; add d4,d5 add.w d4,d5 ;-- DESTINATION MODULO -- ;blt_modu = (SCR_W-blt_widthV)/8 ; moveq #0,d0 moveq #0,d6 move.w #SCR_W,d0 move.b (P1TABLE+3),d6 ; sub d6,d0 ; divu #8,d0 sub.w d6,d0 lsr.w #3,d0 ; add #4,d0 ; Add 4 for extra hidden screen areas ;BUG: SCR_W already includes extra width ; PASTE BACKGROUND ; bsr WAITFORBLITTER ; move.l #$09f00000,$040(a6) ; BLTCON0 - Set Blitter Control bits ; move.l #$ffffffff,$044(a6) ; BLTAFWM - Set Source Mask ; move.l #$ffffffff,$046(a6) ; BLTALWM - Set Source Mask ; move.l #0,$050(a6) ; BLTAPTH - Source (A) pointer - MASK ; move.l a2,$054(a6) ; BLTDPTH - Destination (D) pointer ; move.w #0,$064(a6) ; BLTAMOD - Source Modulo ; move.w d0,$066(a6) ; BLTDMOD - Destination Modulo ; move.w d5,$058(a6) ; BLTSIZE - Size of Rectangle ;-- COPY BACKGROUND -- ; bsr WAITFORBLITTER ; move.l #$09f00000,$040(a6) ; BLTCON0 - Set Blitter Control bits ; move.l #$ffff,$044(a6) ; BLTAFWM - Set Source Mask ; move.l #$f,$046(a6) ; BLTALWM - Set Source Mask ; move.l a2,$050(a6) ; BLTAPTH - Source (A) pointer - MASK ; move.l FRAMEBUFFER,$054(a6) ; BLTDPTH - Destination (D) pointer ; move.w #0,$064(a6) ; BLTAMOD - Source Modulo ; move.w d0,$066(a6) ; BLTDMOD - Destination Modulo ; move.w d5,$058(a6) ; BLTSIZE - Size of Rectangle ; -- BLIT SPRITE -- lea $dff000,a6 ; Custom Chip base address (a6) tst $002(a6) ; DMACONR bsr WAITFORBLITTER ; moveq #0,d7 ; move.b (P1TABLE+2),d7 ; lsl.l #8,d7 ; lsl.l #8,d7 ; lsl.l #8,d7 ; lsl.l #4,d7 move.l #$09f00000<<4+$f,d6 ; Set ASCENDING MODE (Shift RIGHT) and.b (P1TABLE+2),d6 ror.l #4,d6 ; move.l #$09f00000,d6 ; Set ASCENDING MODE (Shift RIGHT) ; or.l d7,d6 move.l d6,$040(a6) ; BLTCON0 - Set Blitter Control bits move.l #$ffffffff,$044(a6) ; BLTAFWM - Set Source Mask ; move.l #$ffffffff,$046(a6) ; BLTALWM - Set Source Mask ;BUG: 44.L will set both masks, 46.L is wrong and not needed ;move.l a1,$04c(a6) ; BLTAPTH - Source (C) pointer - ;move.l a1,$04c(a6) ; BLTAPTH - Source (B) pointer - IMAGE move.l a1,$050(a6) ; BLTAPTH - Source (A) pointer - MASK move.l a2,$054(a6) ; BLTDPTH - Destination (D) pointer move.w #0,$064(a6) ; BLTAMOD - Source Modulo move.w d0,$066(a6) ; BLTDMOD - Destination Modulo move.w d5,$058(a6) ; BLTSIZE - Size of Rectangle movem.l (sp)+,d0-a6 rts WAITFORBLITTER: .waitblit ; Wait for Blitter to finish btst #6,$002(a6) bne.s .waitblit rts ;---------------------------------------------------------------------------------------------- ; CONTROLS ;---------------------------------------------------------------------------------------------- ; BIT - ACTION ; --- - ------ ; 0 - UP ; 1 - DOWN ; 2 - LEFT ; 3 - RIGHT ; 4 - FIRE 1 ; 5 - FIRE 2 ; -------------- HSPEED = 2 VSPEED = 2 RLIMIT = 16 LLIMIT = 0 P1_CONTROLS: ;------------------------------------------ ; RIGHT ;------------------------------------------ .PLAYER1_MOVERIGHT: btst #3,d0 bne .PLAYER1_MOVELEFT bset #0,P1FLAGS btst #1,d0 ; Check if Diagoinal RIGHT-DOWN is pushed bne .NO_RD move.b (P1TABLE+1),d1 add #VSPEED,d1 move.b d1,(P1TABLE+1) .NO_RD btst #0,d0 ; Check if Diagoinal RIGHT-UP is pushed bne .NO_RU move.b (P1TABLE+1),d1 add #-VSPEED,d1 move.b d1,(P1TABLE+1) .NO_RU moveq #0,d1 move.b (P1TABLE+2),d1 ; Move RIGHT within frame shift ; If we are at 0 don't sub, but go to 16pxl WORD shift add #HSPEED,d1 move.b d1,(P1TABLE+2) cmp.b #RLIMIT,d1 blt .no_wordshiftR moveq #0,d1 move.b (P1TABLE),d1 ; Move frame RIGHT BY 16pxls add #16,d1 move.b d1,(P1TABLE) moveq #0,d1 ; Move LEFT within frame shift move.b d1,(P1TABLE+2) .no_wordshiftR jsr BLIT jmp .P1_CONTROLS_DONE ;------------------------------------------ ; LEFT ;------------------------------------------ .PLAYER1_MOVELEFT: btst #2,d0 bne .PLAYER1_MOVEDOWN bclr #0,P1FLAGS ; Set XFLIP to '0' (LEFT) btst #1,d0 ; Test for LEFT-DOWN bne .NO_LD move.b (P1TABLE+1),d1 add #VSPEED,d1 move.b d1,(P1TABLE+1) .NO_LD btst #0,d0 ; Test for LEFT-UP bne .NO_LU move.b (P1TABLE+1),d1 add #-VSPEED,d1 move.b d1,(P1TABLE+1) .NO_LU ;moveq #0,d2 ; Check for left screen Boundary ;move.b (P1TABLE),d2 ;cmp #0,d2 ;beq .no_wordshiftL moveq #0,d1 move.b (P1TABLE+2),d1 ; Move SHIFT left cmp.b #LLIMIT,d1 beq .goto_wordmoveL sub #HSPEED,d1 move.b d1,(P1TABLE+2) cmp.b #LLIMIT,d1 bgt .no_wordshiftL .goto_wordmoveL moveq #0,d1 move.b (P1TABLE),d1 ; Move FRAME left sub #16,d1 move.b d1,(P1TABLE) moveq #0,d1 move.b #15,d1 move.b d1,(P1TABLE+2) .no_wordshiftL jsr BLIT jmp .P1_CONTROLS_DONE .PLAYER1_MOVEDOWN moveq #0,d2 ; Check for bottom screen Boundary move.b (P1TABLE+1),d2 cmp #126,d2 bge .PLAYER1_MOVEUP btst #1,d0 bne .PLAYER1_MOVEUP move.b (P1TABLE+1),d1 add #VSPEED,d1 move.b d1,(P1TABLE+1) jsr BLIT jmp .P1_CONTROLS_DONE .PLAYER1_MOVEUP btst #0,d0 bne .P1_CONTROLS_DONE move.b (P1TABLE+1),d1 add #-VSPEED,d1 move.b d1,(P1TABLE+1) jsr BLIT jmp .P1_CONTROLS_DONE .P1_CONTROLS_DONE: rts ;------------------------------------------------------------------------------------------------------------ ; JOYSTICK ;----------------------------------------------------------------------------------------------- JOYSTICK_READER: ;---7654S321RLDU move.b #%00111111,$BFE201 ;Direction for port A (BFE001)...0=in 1=out...(For fire buttons) move.w $dff00A,d2 ;Joystick-mouse 0 data (vert,horiz) (Joy2) move.b $bfe001,d5 ;/FIR1 /FIR0 /RDY /TK0 /WPRO /CHNG /LED OVL rol.b #1,d5 ;Fire0 for joy 2 bsr Player_ReadControlsOne ;Process Joy2 move.l d0,-(sp) move.w $dff00c,d2 ;Joystick-mouse 1 data (vert,horiz) (Joy1) move.b $bfe001,d5 ;/FIR1 /FIR0 /RDY /TK0 /WPRO /CHNG /LED OVL bsr Player_ReadControlsOne ;Process Joy 1 move.l (sp)+,d1 rts Player_ReadControlsOne: ;Translate HV data into joystick values moveq #0,d0 moveq #0,d1 moveq #0,d3 moveq #0,d4 ; -- Get the 4 bits that are needed for the directions -- roxr.l #1,d2 ;bit 0 roxl.l #1,d3 roxr.l #1,d2 ;bit 1 roxl.l #1,d4 roxr.l #7,d2 ;bit 8 roxl.l #1,d0 and.l #1,d2 ;bit 9 ; -- Calculate the new directions -- move.b d2,d1 eor.b d0,d1 roxr.b d1 roxr.b d0 ;Up (Bit 9 Xor 8) move.b d4,d1 eor.b d3,d1 roxr.b d1 roxr.b d0 ;Down (Bit 1 Xor 0) roxr.b d2 roxr.b d0 ;Left (Bit 9) roxr.b d4 roxr.b d0 ;Right (Bit 1) roxl.b d5 roxr.b d0 ;Fire ror.b #3,d0 eor.b #%11101111,d0 ;Invert UDLR bits or.l #$FFFFFF00,d0 ;Set unused bits rts ;------------------------------------------------------------------------------------------------------------ ; DATA (COPPER, TABLES, GRAPHICS) ;----------------------------------------------------------------------------------------------------------- GFXNAME: dc.b "graphics.library",0 SECTION qq,DATA_C ; ----- COPPER --------------------------------------------------------------------------------------------- COPPER: ; -- DISPLAY SCREEN SIZE -- dc.w $1fc,0 dc.w $08E,$3b81 ; Display Screen Top Left (VVHH) dc.w $090,$1bc1 ; Display Screen Botom Right (VVHH) dc.w $092,$38 ; Display Bitplane Fetch Start (XXHH) dc.w $094,$d0 ; Display Bitplane Fetch Stop (XXHH) dc.w $100,%0100001000000001 ; BPLCON0 ;dc.w $102,%0000000011111111 ; BPLCON1 dc.w $106,%0000000000100000 ; BPLCON3 - Enable ECS Border Blanking ; dc.w $108,SCR_MODULO+4 ; Bitplane Modulo SCR_BPL*3 (odd planes) ; dc.w $10A,SCR_MODULO+4 ; Bitplane Modulo SCR_BPL*3 (even planes) dc.w $108,SCR_MODULO ; Bitplane Modulo SCR_BPL*3 (odd planes) dc.w $10A,SCR_MODULO ; Bitplane Modulo SCR_BPL*3 (even planes) ; -- BITPLANE POINTERS -- ; -- 4 Bitplanes -- CoBplPr: dc.w $0e0,0 ; Bitplane Pointer 1 (High 5 Bits) (ECS) dc.w $0e2,0 ; Bitplane Pointer 1 (Low 15 Bits) dc.w $0e4,0 ; Bitplane Pointer 2 (High 5 Bits) dc.w $0e6,0 ; Bitplane Pointer 2 (Low 15 Bits) dc.w $0e8,0 ; Bitplane Pointer 3 (High 5 Bits) dc.w $0ea,0 ; Bitplane Pointer 3 (Low 15 Bits) dc.w $0ec,0 ; Bitplane Pointer 4 (High 5 Bits) dc.w $0ee,0 ; Bitplane Pointer 4 (Low 15 Bits) SprPtr: dc.w $120,0 dc.w $122,0 dc.w $124,0 dc.w $126,0 dc.w $128,0 dc.w $12a,0 dc.w $12c,0 dc.w $12e,0 dc.w $120,0 dc.w $132,0 dc.w $134,0 dc.w $136,0 dc.w $138,0 dc.w $13a,0 dc.w $13c,0 dc.w $13e,0 ; -- PALETTE COLOURS -- ; PalDefs: dc.w $180,$0a00 ; Colour 0 dc.w $182,$0111 ; Colour 1 dc.w $184,$0620 ; Colour 2 dc.w $186,$0864 ; Colour 3 dc.w $188,$0A86 ; Colour 4 dc.w $18a,$0046 ; Colour 5 dc.w $18c,$00AC ; Colour 6 dc.w $18e,$08EE ; Colour 7 dc.w $190,$0A40 ; Colour 8 dc.w $192,$0E60 ; Colour 9 dc.w $194,$0EA0 ; Colour 10 dc.w $196,$0080 ; Colour 11 dc.w $198,$00C0 ; Colour 12 dc.w $19a,$0ECA ; Colour 13 dc.w $19c,$0CCC ; Colour 14 dc.w $19e,$0EEE ; Colour 15 ; -- COPPER END -- dc.w $ffff,$fffe ; COPPER END ;------------------------------------------------------------------------------------------------------------ ; FLAGS (WIP) ;------------------------------------------------------------------------------------------------------------ ; P1FLAGS ; -------- ; BIT - ACTION ; ------------ ; 0 - XFLIP ; 1 - ; 2 - ; 3 - ; 4 - ; 5 - ; 6 - DIE (Maybe) ; 7 - ACTIVE (Maybe) P1FLAGS: dc.b %00000001 ;------------------------------------------------------------------------------------------------------------ ; TABLES & VARIABLES (WIP) ;----------------------------------------------------------------------------------------------------------- ; ------------- ; BYTE - ACTION ; ------------- ; ; 0 - X ; 1 - Y ; 2 - S (Shift) ; 3 - Width ; 4 - Height ; 5 - State (Maybe) ; 6 - Energy (Maybe) ; 7 - Lives (Maybe) P1TABLE dc.b 16,16,0,96,93 ; X,Y,S,W,H EVEN FRAME: INCBIN "C:\Amiga\FFARES\TEST_IMAGE.RAW" FRAME_END: ;FRAMEBUFFER: ds.b 255 ;------------------------------------------------------------------------------------------------------------ ; BSS ;------------------------------------------------------------------------------------------------------------ SECTION BSS,BSS_C SCREEN: ; ds.w SCR_BPLSIZE ;BUG: only 1 bitplane is allocated ds.b SCR_BPLSIZE*SCR_DEPTH SCREEN_END: END Last edited by a/b; 25 April 2021 at 21:54. Reason: forgot to remove my incbin |
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26 April 2021, 00:16
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#8 | |
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BiO-sanitation Battalion
Join Date: Jun 2017
Location: Scotland
Posts: 151
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Quote:
 Having had a little fiddle around with it, I was able to get it to display an image correctly using a little CPU routine to copy the background image to the screen. So all the bitplane setup and modulo stuff is actually working fine. To add to a/b's post... it's definitely your blitter code that's the problem here, dude. B Last edited by Old_Bob; 26 April 2021 at 00:28. |
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26 April 2021, 08:20
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#9 |
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Prototron
Join Date: Mar 2015
Location: Glasgow, Scotland
Posts: 411
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Thank you for all the help everyone, it's really appreciated. I'm still very much learning at the moment, so these corrections and advice will be invaluable for improving my skills, as I don't know what I'm even looking for when something goes wrong at this stage.
Everything is just a big experiment at the moment to find out how things work, so the joystick stuff and other bits are just me messing around and aren't important. I'll go away and study all the changes/suggestions and take notes for future reference. Once again, thank you all! EDIT: I managed to solve what was wrong. I was using a byte sized variable for the X-Coordinate of my image, so it was getting to 255 on a 320 display and then going back to 0 which made it look like it was wrapping before it hit the right edge of the screen. I changed the variable to a word value and I can now move my image into the hidden margins at the left and right of the screen. Last edited by Brick Nash; 29 April 2021 at 13:09. |
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