Author Topic: clipping (Read 7978 times)

ben_g · « **on:** November 04, 2011, 06:59:30 pm »

I'm trying to make my triangle drawing code clipped, but I must be doing something wrong becouse the buffer overflows which corrupts some flags of the OS.

here's the code that should clip horizontally

Code: [Select]

  ld a, (temp)
  bit 7, a
  jr nz, TEndPlot
  cp 95
  jp nc, Clip

temp is the var that contains the x position of the pixel that will be drawn.
TEndPlot is a label that is behind the code to plot the pixel, so jumping to here doesn't draw the current pixel.
Clip is a label that wen jumped too will stop drawing the current scanline, and prepares for the next one.

Here's the code that should clip vertically:

Code: [Select]

  bit 7, a
  jp nz, Clip
  ld a, (_ty)
  cp 64
  ret nc

_ty is the y coordinate of the scanline that will be drawn.
Clip stops the current scanline (so nothing will be drawn) and prepares the next one.
ret obiously ends the drawing routine.

Many thanks in advance.

Hot_Dog · « **Reply #1 on:** November 07, 2011, 03:37:29 pm »

Can you upload some of your ASM files? At the moment, it doesn't look like you're doing anything wrong, but if it's a problem of corrupted flags, we can help out more if we can see more of the big picture. For example, I'm hoping to see where exactly temp and _ty are

ben_g · « **Reply #2 on:** November 07, 2011, 03:51:02 pm »

Sure I can.

Here is it: http://dl.dropbox.com/u/11215358/invasion.z80
I assembled it with spasm.

BTW: from debugging, I noticed that CmdShadow is never corrupted, and textInverse is corrupted as soon as I press clear.

Here is also what it does in a screenshot:

This is pretty much all information I can give.

jacobly · « **Reply #3 on:** November 09, 2011, 11:53:35 am »

I think I got it!

Code: [Select]

  ld hl, (SaveIY)
  push hl
  pop IY

^ That code is really important, right?
but what happens if it is clipped off the bottom... then the routine returns at the clipping code

Code: [Select]

  bit 7, a
  jp nz, Clip
  ld a, (_ty)
  cp 6
  ret nc // early return, above code is not run!

~~This results it iy pointing to flash, which is why the os goes crazy... because it is unable to set any of its own flags O.o~~
Edit: my mistake, it actually points inside saveSScreen, which still causes problems

P.S. ld iy,(nnnn) and ld (nnnn),iy are both documented instructions...

ben_g · « **Reply #4 on:** November 09, 2011, 01:37:44 pm »

thanks. That solved clipping at the bottom edge. Now bottom and right edge work. The top and left edges make the triangle look weird and slow down the fps, but nothing is corrupted anymore.
Here is what it does instaed of clipping at the top and left edges:

Hot_Dog · « **Reply #5 on:** November 10, 2011, 12:02:02 am »

By the way, this is a pretty sweet program!

annoyingcalc · « **Reply #6 on:** November 10, 2011, 12:08:47 am »

please pm me a compiled version spasm doesnt work for me

ben_g · « **Reply #7 on:** November 10, 2011, 01:14:04 pm »

Quote from: Hot_Dog on November 10, 2011, 12:02:02 am

By the way, this is a pretty sweet program!

Thanks. But please don't use code from it in your own projects yet: Not all code is mine: I used some routines from other people of which most of them are modified to fit the needs of this program, And I want those people and everybody who helped me to to have some credits. And it'll probably be open source anyway when it's done.

Quote from: annoyingcalc on November 10, 2011, 12:08:47 am

please pm me a compiled version spasm doesnt work for me

Ok, I'll send you one

EDIT: I just thought that it might be best to put it on the tread itself, for anyone else who wants to run it when spasm doesn't work, so here's the link:
http://dl.dropbox.com/u/11215358/invasion.8xk

btw: you can run around with the arrow keys, and look up/down with [1]/[0]. press [CLEAR] to exit.

ben_g · « **Reply #8 on:** November 16, 2011, 04:26:25 pm »

I have tried several different stuff with my code the last days, but I still can't get clipping right for the top and left edges. It keeps doing random stuff when it needs to clip of those edges.

Here's the full code:

Spoiler For the code:

; =============================================================== ; Alien Invasion ; =============================================================== ;BTW: store 16bit integer hl in 16.8 fixed point var var: ld (var+1),hl \ xor a \ ld (var),a ; ld hl, (var1) \ ld de, (var2) \ add hl, de \ ld a, (var1+2) \ adc a, 0 \ ld (var1), hl \ ld (var1+2), a ; als var1 negatief is, doe adc a, $FF ipv. adc a, 0 ; ld hl,(var1) \ ld de, (var2) \ ld a, h \ rla \ sbc a,a \ add hl, de \ ld b, a \ ld a, (var1+2) \ ld (var2), hl \ adc a, b \ ld (var1+2), a .org $4000 .db 080h, 00Fh .db 000h, 000h, 000h, 000h .db 080h, 012h .db 001h, 004h .db 080h, 021h .db 001h .db 080h, 031h .db 001h .db 080h, 048h .db "INVASION" .db 080h, 081h .db 001h .db 080h, 090h .db 003h, 026h, 009h, 004h .db 01Bh, 053h, 00Bh, 079h .db 002h, 00Dh, 040h, 0A1h, 06Bh, 099h, 0F6h, 059h, 0BCh, 067h .db 0F5h, 085h, 09Ch, 009h, 06Ch, 00Fh, 0B4h, 003h, 09Bh, 0C9h .db 003h, 032h, 02Ch, 0E0h, 003h, 020h, 0E3h, 02Ch, 0F4h, 02Dh .db 073h, 0B4h, 027h, 0C4h, 0A0h, 072h, 054h, 0B9h, 0EAh, 07Ch .db 03Bh, 0AAh, 016h, 0F6h, 077h, 083h, 07Ah, 0EEh, 01Ah, 0D4h .db 042h, 04Ch, 06Bh, 08Bh, 013h, 01Fh, 0BBh, 093h, 08Bh, 0FCh .db 019h, 01Ch, 03Ch, 0ECh, 04Dh, 0E5h, 075h .db 080h, 07Fh .db 000h, 000h, 000h, 000h .db 000h, 000h, 000h, 000h .db 000h, 000h, 000h, 000h .db 000h, 000h, 000h, 000h .db 000h, 000h, 000h, 000h .nolist #include "ti83plus.inc" .list #define bcall(label) rst 28h \ .dw label #define bjump(label) call $50 \ .dw label #define SubFP xor a \ sbc hl, de #define cpHLDE or a \ sbc hl, de \ add hl, de #define gbuf plotsscreen ;;;;;;;;;;;;;;;;;;;;;;;;;; VARIABELEN ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; temp .equ SavesScreen temp2 .equ temp+2 temp3 .equ temp2+2 Asqr .equ temp3+2 Bsqr .equ Asqr+2 Csqr .equ Bsqr+2 xfrom .equ Csqr+2 yfrom .equ xfrom+2 zfrom .equ yfrom+2 xto .equ zfrom+2 yto .equ xto+2 zto .equ yto+2 xup .equ zto+2 yup .equ xup+2 zup .equ yup+2 angle .equ zup+2 xcross .equ angle+1 ycross .equ xcross+2 zcross .equ ycross+2 xpoint .equ zcross+2 ypoint .equ xpoint+2 zpoint .equ ypoint+2 valid .equ zpoint+2 screenX .equ valid+1 screenY .equ screenx+2 screenx2 .equ screeny+2 screeny2 .equ screenx2+2 screenx3 .equ screeny2+2 screeny3 .equ screenx3+2 screenx4 .equ screeny3+2 screeny4 .equ screenx4+2 X .equ screeny4+2 Y .equ X+2 Direction .equ Y+2 x1 .equ Direction+1 y1 .equ x1+2 u1 .equ y1+2 v1 .equ u1+1 x2 .equ v1+1 y2 .equ x2+2 u2 .equ y2+2 v2 .equ u2+1 x3 .equ v2+1 y3 .equ x3+2 u3 .equ y3+2 v3 .equ u3+1 dx1 .equ V3+1 dx2 .equ dx1+2 dx3 .equ dx2+2 dx4 .equ dx3+2 du1 .equ dx4+2 dv1 .equ du1+2 du2 .equ dv1+2 dv2 .equ du2+2 du3 .equ dv2+2 dv3 .equ du3+2 du4 .equ dv3+2 dv4 .equ du4+2 tx1 .equ dv4+2 tx2 .equ tx1+3 tu1 .equ tx2+3 tv1 .equ tu1+2 tu2 .equ tv1+2 tv2 .equ tu2+2 tx12 .equ tv2+2 tx22 .equ tx12+3 tu12 .equ tx22+3 tv12 .equ tu12+2 tu22 .equ tv12+2 tv22 .equ tu22+2 _ty .equ tv22+2 tmpu .equ _ty+2 tmpv .equ tmpu+2 tmpdu .equ tmpv+2 tmpdv .equ tmpdu+2 mask .equ tmpdv+2 pointer .equ mask+1 TempFlags .equ pointer+2 SaveIY .equ TempFlags+1 ;2 bytes zto2 .equ saveIY+2 ;2 bytes ;;;;;;;;;;;;;;; START PROGRAMMA ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Start: di ;bcall(_RunIndicOff) ;call InitFPS call ClearGbuf call fastCopy ld a, 64*3 ld (direction), a in a,($02) rla sbc a, a out ($20), a ;ld l, a ;ld h, a ld hl, 0 ld (x), hl ld hl, $0200 ld (y), hl ld hl, 0 ld (x1), hl ld (y1), hl ld a, 0 ld (u1), a ld (v1), a ld (v2), a ld (u3), a ld a, 8 ld (u2), a ld (v3), a ld hl, 40 ld (x2), hl ld (y3), hl ld hl, 20 ld (y2), hl ld (x3), hl call DrawTriangle call FastCopy bcall(_GetKey) ld hl, 0 ld (zto2), hl ld (saveIY), IY ld IY, tempFlags SpelLus: call ClearGBuf #comment ld a, $FF ld (plotsscreen), a ld hl, plotsscreen ld de, plotsscreen+1 ld bc, 767 ldir #endcomment ld hl, (x) ld (xfrom), hl ld hl, (y) ld (yfrom), hl ld hl, 0 ld (zfrom), hl ;ld (zto), hl ld a, 64 ld b, a ld a, (direction) add a, b call SinA ld de, (x) add hl, de ld (xto), hl ld a, (direction) call SinA ld de, (y) add hl, de ld (yto), hl ld hl, $0100 ld (zup), hl ld hl, 0 ld (xup), hl ld (yup), hl ld hl, (zto2) ld (zto), hl call InitView ld hl, -$0100 ld (xpoint), hl ld hl, 0 ld (ypoint), hl ld hl, -$0100 ld (zpoint), hl call C3DTo2D ld hl, (screenx) ld (screenx2), hl ld hl, (screeny) ld (screeny2), hl ld hl, $0100 ld (xpoint), hl ld hl, 0 ld (ypoint), hl ld hl, -$0100 ld (zpoint), hl call C3DTo2D ld hl, (screenx) ld (screenx3), hl ld hl, (screeny) ld (screeny3), hl ld hl, -$0100 ld (xpoint), hl ld hl, 0 ld (ypoint), hl ld hl, $0100 ld (zpoint), hl call C3DTo2D ld hl, (screenx) ld (x1), hl ld hl, (screeny) ld (y1), hl ld a, 8 ld (u1), a ld a, 0 ld (v1), a ld hl, (screenx2) ld (x2), hl ld hl, (screeny2) ld (y2), hl ld a, 8 ld (u2), a ld a, 8 ld (v2), a ld hl, (screenx3) ld (x3), hl ld hl, (screeny3) ld (y3), hl ld a, 0 ld (u3), a ld a, 8 ld (v3), a call DrawTriangle ;call FastCopy ;call ClearGBuf ld hl, -$0100 ld (xpoint), hl ld hl, 0 ld (ypoint), hl ld hl, $0100 ld (zpoint), hl call C3DTo2D ld hl, (screenx) ld (screenx2), hl ld hl, (screeny) ld (screeny2), hl ld hl, $0100 ld (xpoint), hl ld hl, 0 ld (ypoint), hl ld hl, $0100 ld (zpoint), hl call C3DTo2D ld hl, (screenx) ld (screenx3), hl ld hl, (screeny) ld (screeny3), hl ld hl, $0100 ld (xpoint), hl ld hl, 0 ld (ypoint), hl ld hl, -$0100 ld (zpoint), hl call C3DTo2D ld hl, (screenx) ld (x1), hl ld hl, (screeny) ld (y1), hl ld a, 0 ld (u1), a ld a, 8 ld (v1), a ld hl, (screenx2) ld (x2), hl ld hl, (screeny2) ld (y2), hl ld a, 8 ld (u2), a ld a, 0 ld (v2), a ld hl, (screenx3) ld (x3), hl ld hl, (screeny3) ld (y3), hl ld a, 0 ld (u3), a ld (v3), a call DrawTriangle call FastCopy ;knoppen ld a, $FE out (1), a push hl \ pop hl ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; in a, (1) bit 0, a call z, MoveBack bit 3, a call z, MoveForward bit 1, a call z, TurnLeft bit 2, a call z, TurnRight ld a, %11111101 out ($01), a push hl \ pop hl ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; in a, ($01) bit 6, a jp z, Einde ld a, $EF out (1), a push hl pop hl in a, (1) bit 0, a call z, LookDown bit 1, a call z, LookUp jp spelLus MoveBack: push af ld a, (direction) ld b, 64 add a, b call SinA call NegHL ld de, $0A00 call DivFP ld de, (X) add hl, de ld (X), hl ld a, (direction) call SinA call NegHL ld de, $0A00 call DivFP ld de, (Y) add hl, de ld (Y), hl pop af ret MoveForward: push af ld a, (direction) ld b, 64 add a, b call SinA ld de, $0A00 call DivFP ld de, (X) add hl, de ld (X), hl ld a, (direction) call SinA ld de, $0A00 call DivFP ld de, (Y) add hl, de ld (Y), hl pop af ret TurnLeft: push af ld a, (direction) inc a ld (direction), a pop af ret TurnRight: ld a, (direction) dec a ld (direction), a ret LookUp: ld hl, (zto2) inc hl inc hl inc hl inc hl ld (zto2), hl ret LookDown: ld hl, (zto2) dec hl dec hl dec hl dec hl ld (zto2), hl ret Einde: ;Key port resetten ld a, $FF out ($01), a call ClearGbuf call fastCopy ld hl, 0 ld (CurRow), hl ld IY, (saveIY) EI bjump(_JForceCmdNoChar) Cto0: ld c, 0 pop ix ret ;;;;;;;;;;;;;;;; 3D ENGINE ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;TODO: bereken de zoom InitView: ;call once every frame, before C3DTo2D ;IN: The engine's vars ;OUT: vars are initialised ;DESTROYS: all registers and the engine's variables ld hl, (xto) ld de, (xfrom) SubFP ld (xto), hl ld hl, (yto) ld de, (yfrom) SubFP ld (yto), hl ld hl, (zto) ld de, (zfrom) SubFP ld (zto), hl ld de, (xto) ld b, d \ ld c, e call MulFP ld (temp), hl ld de, (yto) ld b, d \ ld c, e call MulFP ld de, (temp) add hl, de ld (temp), hl ld de, (zto) ld b, d \ ld c, e call MulFP ld de, (temp) add hl, de call SqrtFP ld (temp), hl ld hl, (xto) ld de, (temp) call DivFP ld (xto), hl ld hl, (yto) ld de, (temp) call DivFP ld (yto), hl ld hl, (zto) ld de, (temp) call DivFP ld (zto), hl ld de, (xup) ld bc, (xto) call MulFP ld (temp), hl ld de, (yup) ld bc, (yto) call MulFP ld de, (temp) add hl, de ld (temp), hl ld de, (zup) ld bc, (zto) call MulFP ld de, (temp) add hl, de ld (temp), hl ld de, (temp) ld bc, (xto) call MulFP ld d, h \ ld e, l ld hl, (xup) SubFP ld (xup), hl ld de, (temp) ld bc, (yto) call MulFP ld d, h \ ld e, l ld hl, (yup) SubFP ld (yup), hl ld de, (temp) ld bc, (zto) call MulFP ld d, h \ ld e, l ld hl, (zup) SubFP ld (zup), hl ld de, (xup) ld b, d \ ld c, e call MulFP ld (temp), hl ld de, (yup) ld b, d \ ld c, e call MulFP ld de, (temp) add hl, de ld (temp), hl ld de, (zup) ld b, d \ ld c, e call MulFP ld de, (temp) add hl, de call sqrtFP ld (temp), hl ;Multiply (temp) with the tangent of (angle)/2, which is, in this test program, equal to 1, so we don't need to multiply ld hl, (xup) ld de, (temp) call DivFP ld (xup), hl ld hl, (yup) ld de, (temp) call DivFP ld (yup), hl ld hl, (zup) ld de, (temp) call DivFP ld (zup), hl ld de, (yup) ld bc, (zto) call MulFP ld (temp), hl ld de, (zup) ld bc, (yto) call MulFP ld d, h \ ld e, l ld hl, (temp) SubFP ld (xcross), hl ld de, (zup) ld bc, (xto) call MulFP ld (temp), hl ld de, (xup) ld bc, (zto) call MulFP ld d, h \ ld e, l ld hl, (temp) SubFP ld (ycross), hl ld de, (xup) ld bc, (yto) call MulFP ld (temp), hl ld de, (yup) ld bc, (xto) call MulFP ld d, h \ ld e, l ld hl, (temp) SubFP ld (zcross), hl ret C3DTo2D: ;IN: xpoint, ypoint and zpoint vars ;OUT: screenx and screeny are set to the onscreen coordinates for the point ;Will not work if InitView wasn't called before this routine ;destroys all registers and xpoint, ypoint and zpoint ld hl, (xpoint) ld de, (xfrom) SubFP ld (xpoint), hl ld hl, (ypoint) ld de, (yfrom) SubFP ld (ypoint), hl ld hl, (zpoint) ld de, (zfrom) SubFP ld (zpoint), hl ld de, (xpoint) ld bc, (xto) call MulFP ld (temp), hl ld de, (ypoint) ld bc, (yto) call MulFP ld de, (temp) add hl, de ld (temp), hl ld de, (zpoint) ld bc, (zto) call MulFP ld de, (temp) add hl, de ld (temp), hl ;kijk hier of het punt zichtbaar is bit 7, h jp nz, InValid ld de, (xpoint) ld bc, (xcross) call MulFP ld (temp2), hl ld de, (ypoint) ld bc, (ycross) call MulFP ld de, (temp2) add hl, de ld (temp2), hl ld de, (zpoint) ld bc, (zcross) call MulFP ;ld de, (temp2) ;ld bc, (zup) ;call MulFP ld de, (temp2) add hl, de ld de, (temp) call DivFP ld (screenx), hl ld de, (xpoint) ld bc, (xup) call MulFP ld (temp2), hl ld de, (ypoint) ld bc, (yup) call MulFP ld de, (temp2) add hl, de ld (temp2), hl ld de, (zpoint) ld bc, (zup) call MulFP ld de, (temp2) add hl, de ld de, (temp) call DivFP ld (screeny), hl ld hl, $0100 ld de, (screenx) SubFP ld b, h \ ld c, l ld de, 48 call MulFP ld (screenx), hl ld de, (screeny) ld hl, $0100 SubFP ld b, h \ ld c, l ld de, 32 call MulFP ld (screeny), hl ld a, 1 ret InValid: ld a, 0 ret ;;;;;;;;;;;;;;;; GRAPHIC ROUTINES ;;;;;;;;;;;;;;;;;;;;;;;;; DrawLine: ;(h,l)to(d,e) pop ix ld c, h push bc ld c, l push bc ld c, d push bc ld l, e push ix p_Line: .db __LineEnd-$-1 ld ix,plotSScreen ld a,l pop hl pop bc pop de ex (sp),hl ;Called with 3 args pushed. Using call-back optimization. cp 64 ret nc ld b,a ld a,e cp 64 ret nc ld d,l ld l,b ld a,d cp 96 ret nc ld a,c cp 96 ret nc ld h,a sub d jr nc,__LineSkipRev ex de,hl neg __LineSkipRev: push af ; Saving DX (it will be popped into DE below) ld a,d ; IX+=D/8+E*12 (actually E*4+E*4+E*4) rra rra rra and %00011111 ld c,a ld b,0 add ix,bc ld a,e add a,a add a,a ld c,a add ix,bc add ix,bc add ix,bc ld a,d ; Calculating the starting pixel mask and %00000111 inc a ld b,a ld a,%00000001 __LineMaskLoop: rrca djnz __LineMaskLoop ld c,a ld a,l ; Calculating delta Y and negating the Y increment if necessary sub e ; This is the last instruction for which we need the original data ld de,12 jr nc,__LineSkipNeg ld de,-12 neg __LineSkipNeg: pop hl ; Recalling DX ld l,a ; D=DX, E=DY cp h jr c,__LineHoriz ; Line is rather horizontal than vertical __LineVert: ld b,l ; Pixel counter inc b rra ; nc at this point so (A=E/2) __LineVLoop: push af ld a,(ix+0) or c ; Writing pixel to current position ld (ix+0),a pop af add ix,de sub h ; Handling gradient jr nc,__LineVNext add a,l rrc c ; Rotating mask jr nc,__LineVNext ; Handling byte boundary inc ix __LineVNext: djnz __LineVLoop ret __LineHoriz: ld b,h ; Pixel counter inc b ld a,h ; Setting up gradient counter srl a __LineHLoop: push af ; Saving A ld a,(ix+0) or c ; Writing pixel to current position ld (ix+0),a pop af ; Recalling A rrc c ; Rotating mask jr nc,__LineHSkip ; Handling byte boundary inc ix __LineHSkip: sub l ; Handling gradient jr nc,__LineHNext add a,h add ix,de __LineHNext: djnz __LineHLoop ret __LineEnd: ;;;;;;;;;;;;;;;;;; ;ClearGbuf ;wist de graphics buffer ; ;IN: / ;OUT: wist de graphics buffer ClearGbuf: ld hl, gbuf-12-(-(12*64)+1) ld a, $20 ld c, a ClearGbufAgain: ld b, 64 inc c ld de, -(12*64)+1 add hl, de ld de, 10 ClearGbufLoop: add hl, de inc hl inc hl inc de ld (hl), $00 dec de djnz ClearGbufLoop ld a, c cp $2B+1 jr nz, ClearGbufAgain ret ;;;;;;;;;;;;;;;;;; ;fastcopy ;IN: / ;OUT: / ;copies the buffer to the screen fastCopy: di ld a,$80 out ($10),a ld hl,gbuf-12-(-(12*64)+1) ld a,$20 ld c,a inc hl dec hl fastCopyAgain: ld b,64 inc c ld de,-(12*64)+1 out ($10),a add hl,de ld de,10 fastCopyLoop: add hl,de inc hl inc hl inc de ld a,(hl) out ($11),a dec de djnz fastCopyLoop ld a,c cp $2B+1 jr nz,fastCopyAgain ret DrawTriangle: ;IN: x1,y1,u1,v1,x2,y2,u2,v2,x3,y3,u3,v3 ;scherm = 96*64 ld hl, (y1) ld de, (y2) cpHLDE jr c, Y1SmallerThanY2 ld (y1), de ld (y2), hl ld hl, (x1) ld de, (x2) ld (x1), de ld (x2), hl #comment ld hl, (u1) ld de, (u2) ld (u1), de ld (u2), hl #endComment ld a, (u1) ld b, a ld a, (u2) ld (u1), a ld a, b ld (u2), a ld a, (v1) ld b, a ld a, (v2) ld (v1), a ld a, b ld (v2), a Y1SmallerThanY2: ld hl, (y1) ld de, (y3) cpHLDE jr c, Y1SmallerThanY3 ld (y1), de ld (y3), hl ld hl, (x1) ld de, (x3) ld (x1), de ld (x3), hl #comment ld hl, (u1) ld de, (u3) ld (u1), de ld (u3), hl #endcomment ld a, (u1) ld b, a ld a, (u3) ld (u1), a ld a, b ld (u3), a ld a, (v1) ld b, a ld a, (v3) ld (v1), a ld a, b ld (v3), a Y1SmallerThanY3: ld hl, (y2) ld de, (y3) cpHLDE jr c, Y2SmallerThanY3 ld (y2), de ld (y3), hl ld hl, (x2) ld de, (x3) ld (x2), de ld (x3), hl #comment ld hl, (u2) ld de, (u3) ld (u2), de ld (u3), hl #endComment ld a, (u2) ld b, a ld a, (u3) ld (u2), a ld a, b ld (u3), a ld a, (v2) ld b, a ld a, (v3) ld (v2), a ld a, b ld (v3), a Y2SmallerThanY3: res 0, (IY) ;in bit 0, (IY) wordt opgeslagen bij welke helft het is. 0=eerste helft, 1= tweede helft res 1, (IY) ;bit 1, (IY) = interval texturen al berekend ld hl, (y2) ld de, (y1) subFP ;hier gebruikt om 16-bit getallen af te trekken I.P.V. fixed-point getallen bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld hl, (x2) ld de, (x1) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l pop de call DivFP ld (dx1), hl ld hl, (y3) ld de, (y2) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld hl, (x3) ld de, (x2) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l pop de call DivFP ld (dx2), hl ld hl, (y3) ld de, (y1) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld hl, (x3) ld de, (x1) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l pop de call DivFP ld (dx3), hl ld hl, (y2) ld de, (y1) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld a, (u2) ld h, a ld l, 0 ld a, (u1) ld d, a ld e, 0 subFP ;ld h, l ;ld l, 0 pop de call DivFP ld (du1), hl ld hl, (y3) ld de, (y2) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld a, (u3) ld h, a ld l, 0 ld a, (u2) ld d, a ld e, 0 subFP ;ld h, l ;ld l, 0 pop de call DivFP ld (du2), hl ld hl, (y3) ld de, (y1) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld a, (u3) ld h, a ld l, 0 ld a, (u1) ld d, a ld e, 0 subFP ;ld h, l ;ld l, 0 pop de call DivFP ld (du3), hl ld hl, (y2) ld de, (y1) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld a, (v2) ld h, a ld l, 0 ld a, (v1) ld d, a ld l, 0 subFP ;ld h, l ;ld l, 0 pop de call DivFP ld (dv1), hl ld hl, (y3) ld de, (y2) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld a, (v3) ld h, a ld l, 0 ld a, (v2) ld d, a ld e, 0 subFP ;ld h, l ;ld l, 0 pop de call DivFP ld (dv2), hl ld hl, (y3) ld de, (y1) subFP bit 7, h ld h, l ld l, 0 jr z,$+3 \ dec l push hl ld a, (v3) ld h, a ld l, 0 ld a, (v1) ld d, a ld e, 0 subFP ;ld h, l ;ld l, 0 pop de call DivFP ld (dv3), hl ld hl, (x1) bit 7, h jr z, TPos1 ld (tx1+1),hl \ ld a, $FF \ ld (tx1),a ld (tx2+1),hl \ ld a, $FF \ ld (tx2),a jr TEnd1 TPos1: ld (tx1+1),hl \ xor a \ ld (tx1),a ;store the 16bit integer at hl into 16.8 fixed point number tx1 ld (tx2+1),hl \ xor a \ ld (tx2),a TEnd1: ld hl, (y1) ld (_ty), hl ld a, (u1) ld h, a ld l, 0 ld (tu1), hl ld (tu2), hl ld a, (v1) ld h, a ld l, 0 ld (tv1), hl ld (tv2), hl ld hl, (Y1) ld de, (y2) cpHLDE jp z, __TEndLoop TDrawLoop: ld a, (_ty) ld d, a bit 7, a jp nz, Clip ld a, (_ty) cp 64 ret nc ld hl, (tu1) ld (tmpu), hl ld hl, (tv1) ld (tmpv), hl ld hl, (tu2) ld (temp2), hl ld hl, (tv2) ld (temp3), hl ld a, (tx2+1) ld (temp+1), a ld b, a ld a, (tx1+1) ld (temp), a cp b jr c, TOrdered ld hl, (tu2) ld (tmpu), hl ld hl, (tv2) ld (tmpv), hl ld hl, (tu1) ld (temp2), hl ld hl, (tv1) ld (temp3), hl ld a, (tx2+1) ld (temp), a ld a, (tx1+1) ld (temp+1), a TOrdered: ld l, d ld a, (temp) call GetPixel ld (mask), a ld (pointer), hl bit 1, (IY) jr nz, TPlotLoop ld hl, (tx1) ld de, (tx2) cpHLDE jr z, TPlotLoop ld a, (temp) ld h, a ld l, 0 ld a, (temp+1) ld d, a ld e, 0 subFP push hl ld hl, (tmpu) ld de, (temp2) subFP pop de call DivFP ld (tmpdu), hl ld a, (temp) ld h, a ld l, 0 ld a, (temp+1) ld d, a ld e, 0 subFP push hl ld hl, (tmpv) ld de, (temp3) subFP pop de call DivFP ld (tmpdv), hl set 1, (IY) TPlotLoop: ld a, (temp) bit 7, a jr nz, TEndPlot cp 96 jp nc, Clip ld a, (tmpv+1) ld hl, texture add a, l ld l, a ld a, (tmpu+1) ld b, a inc b ld a, (hl) TshiftLoop: rla djnz TshiftLoop ;push af ld a, (mask) ld hl, (pointer) jr c, TSetPixel TResPixel: ;ld a, b cpl and (hl) ld (hl), a jr TEndPlot TSetPixel: ;ld a, b or (hl) ld (hl), a TEndPlot: ld hl, mask rrc (hl) jr nc, TNoCarry ld hl, (pointer) inc hl ld (pointer), hl TNoCarry: ld hl, (tmpu) ld de, (tmpdu) add hl, de ld (tmpu), hl ld hl, (tmpv) ld de, (tmpdv) add hl, de ld (tmpv), hl ld a, (temp+1) ld b, a ld a, (temp) ld hl, temp inc (hl) cp b jr nz, TPlotLoop bit 0, (IY) jr nz, aaaa res 1, (IY) aaaa: Clip: ld hl,(tx1) ld de, (dx1) ld a, d rla sbc a, a ld b, a add hl, de ld (tx1), hl ld a, (tx1+2) adc a, b ld (tx1+2), a ld hl,(tx2) ld de, (dx3) ld a, d rla sbc a, a ld b, a add hl, de ld (tx2), hl ld a, (tx2+2) adc a, b ld (tx2+2), a ld hl, (tu1) ld de, (du1) add hl, de ld (tu1), hl ld hl, (tu2) ld de, (du3) add hl, de ld (tu2), hl ld hl, (tv1) ld de, (dv1) add hl, de ld (tv1), hl ld hl, (tv2) ld de, (dv3) add hl, de ld (tv2), hl ld hl, (_ty) inc hl ld (_ty), hl ld de, (y2) cpHLDE jp c, TDrawLoop bit 0, (IY) jr nz, _TEnd __TEndLoop: ;Begin tweede keer tekenen: ld hl, (y2) ld (_ty), hl ld hl, (y3) ld (y2), hl ld hl, (dx2) ld (dx1), hl ld hl, (du2) ld (du1), hl ld hl, (dv2) ld (dv1), hl ld hl, (x2) bit 7, h jr nz, TPos4 ld (tx1+1),hl \ ld a, $FF \ ld (tx1),a jr TEnd4 TPos4: ld (tx1+1),hl \ xor a \ ld (tx1),a Tend4: ld a, (u2) ld h, a ld l, 0 ld (tu1), hl ld a, (v2) ld h, a ld l, 0 ld (tv1), hl set 0, (IY) jp TDrawLoop _TEnd: ret getPixel: ld h, 0 ld d, h ld e, l add hl, hl add hl, de add hl, hl add hl, hl ld e, a srl e srl e srl e add hl, de ld de, PlotSScreen add hl, de and 7 ld b, a ld a, $80 ret z rrca djnz $-1 ret ;;;;;;;;;;;;;;;;;;;;;;;;;; MATH ROUTINES ;;;;;;;;;;;;;;;;;;;;;;;;;;; SqrtA: LD (Asqr),A SRL A JR DataOver DataOver: LD (Bsqr),A LD B,A LD (Csqr),A iterate: LD A,(Bsqr) ld b, a LD a,(Asqr) LD D,A LD E,B dividedbyEreturnA: RL D RLA SUB E JR nc,$+3 ADD A,E LD E,A LD A,D CPL push af ;1 LD a,(Bsqr) ld b, a pop af ;0 ADD A,B SRL A LD (Bsqr),A LD a,(Bsqr) ld b, a LD A,(Csqr) DEC A CP B JR z,done push af ;1 LD (Csqr),a ld b, a pop af ;0 JR iterate done: LD A,(Bsqr) RET ;SubFP: ; ;substracts 2 16-bit fixed-point numbers ; ;IN: hl, de ; ;OUT: hl - de in hl ; ;DESTROYS: a, hl ; or a ;clear carry flag ; sbc hl, de ; ret Div16By8: ;divides a 16-bit number by an 8-bit number ;IN: hl and d ;OUT: hl = hl/d, remainder = a ;DESTROYS: a, b, c, d, hl xor a ld b, 16 _D16b8Loop: add hl, hl rla jr c, _D16b8Overflow cp d jr c, _D16b8Skip _D16b8Overflow: sub b inc l _D16b8Skip: djnz _D16b8Loop ret MulFP: ;Multiplies 2 16bit fixed-point numbers ;IN: de, bc ;OUT: de * bc in hl ;DESTROYS: af, bc, de, hl bit 7, d jr nz, _MulFP_FirstNeg bit 7, b jr nz, _MulFP_AnsNeg jr z, _MulFP_AnsPos _MulFP_FirstNeg: bit 7, b jr nz, _MulFP_AnsPos _MulFP_AnsNeg: ld a, 1 push af ;1 jr _MulFP_Cont _MulFP_AnsPos: ld a, 0 push af ;1 _MulFP_Cont: bit 7, b jr z, _MulFP_BCPos call NegBC _MulFP_BCPos: bit 7, d jr z, _MulFP_DEPos call NegDE _MulFP_DEPos: ld hl,0 ld a,16 Mul16Loop: add hl,hl rl e rl d jp nc,NoMul16 add hl,bc jp nc,NoMul16 inc de NoMul16: dec a jp nz,Mul16Loop ld l, h ld h, e pop af ;0 cp 1 call z, NegHL ret ;adding fixed-point numbers: ;load one of the numbers in hl, and the other in an other 16-bit register. ;then, do: add hl, <register> DivFP: ;IN: hl, de ;OUT: hl = hl / de ;DESTROYS: af, hl, bc, d bit 7, d jr nz, _DivFP_FirstNeg bit 7, h jr nz, _DivFP_AnsNeg jr z, _DivFP_AnsPos _DivFP_FirstNeg: bit 7, h jr nz, _DivFP_AnsPos _DivFP_AnsNeg: ld a, 1 push af jr _DivFP_Cont _DivFP_AnsPos: ld a, 0 push af _DivFP_Cont: bit 7, h jr z, _DivFP_HLPos call NegHL _DivFP_HLPos: bit 7, d jr z, _DivFP_DEPos call NegDE _DivFP_DEPos ld a, h ld h, l ld l, 0 push hl ;INPUTS: ahl = dividend de = divisor ;1 pop ix ;OUTPUTS: ahl = quotient de = divisor ;0 ld hl,0 ld b,24 _Div24by16loop: add ix,ix rla adc hl,hl jr c,_Div24by16setbit or a sbc hl,de add hl,de jr c,_Div24by16skip _Div24by16setbit: or a sbc hl,de inc ix _Div24by16skip: djnz _Div24by16loop push ix ;1 pop hl ;0 pop af cp 1 call z, NegHL ret SinA: ;calculates the sine of a as a fixed point number ;IN: a ;OUT: hl = sin(a) LD h, 0 LD l, a add hl, hl LD DE, sine_table ADD HL, DE LD A, (HL) INC HL LD H, (HL) LD L, A RET sine_table: .dw 0, 6, 13, 19, 25, 31, 38, 44, 50, 56, 62, 68, 74, 80, 86, 92, 98, 104, 109, 115, 121, 126, 132, 137, 142 .dw 147, 152, 157, 162, 167, 172, 177, 181, 185, 190, 194, 198, 202, 206, 209, 213, 216, 220, 223, 226, 229, 231, 234 .dw 237, 239, 241, 243, 245, 247, 248, 250, 251, 252, 253, 254, 255, 255, 256, 256, 256, 256, 256, 255, 255, 254, 253 .dw 252, 251, 250, 248, 247, 245, 243, 241, 239, 237, 234, 231, 229, 226, 223, 220, 216, 213, 209, 206, 202, 198, 194 .dw 190, 185, 181, 177, 172, 167, 162, 157, 152, 147, 142, 137, 132, 126, 121, 115, 109, 104, 98, 92, 86, 80, 74, 68 .dw 62, 56, 50, 44, 38, 31, 25, 19, 13, 6, 0, -6, -13, -19, -25, -31, -38, -44, -50, -56, -62, -68, -74, -80, -86, -92 .dw -98, -104, -109, -115, -121, -126, -132, -137, -142, -147, -152, -157, -162, -167, -172, -177, -181, -185, -190 .dw -194, -198, -202, -206, -209, -213, -216, -220, -223, -226, -229, -231, -234, -237, -239, -241, -243, -245, -247 .dw -248, -250, -251, -252, -253, -254, -255, -255, -256, -256, -256, -256, -256, -255, -255, -254, -253, -252, -251 .dw -250, -248, -247, -245, -243, -241, -239, -237, -234, -231, -229, -226, -223, -220, -216, -213, -209, -206, -202 .dw -198, -194, -190, -185, -181, -177, -172, -167, -162, -157, -152, -147, -142, -137, -132, -126, -121, -115, -109 .dw -104, -98, -92, -86, -80, -74, -68, -62, -56, -50, -44, -38, -31, -25, -19, -13, -6 SqrtFP: ;##################################################### ;square root of fixed point hl ;input: hl ;output: hl=sqrt(hl) sqrt_hl: ld a, l ld l, h ld de, 0040h ; 40h appends "01" to D ld h, d ld b, 7 ; need to clear the carry beforehand or a _loopz: sbc hl, de jr nc, $+3 add hl, de ccf rl d rla adc hl, hl rla adc hl, hl djnz _loopz sbc hl, de ; optimised last iteration ccf rl d ld h, d xor a ld b, 4 shiftLoopz: srl h rra djnz shiftLoopz ld l, a ret NegHL: xor a sub l ld l,a sbc a,a sub h ld h,a ret NegBC: xor a sub c ld c,a sbc a,a sub b ld b,a ret NegDE: xor a sub e ld e,a sbc a,a sub d ld d,a ret ;;;;;;;;;;;;;;;;;;;;;;;;;; OTHER ROUTINES ;;;;;;;;;;;;;;;;;;;;;;;;;; ;################################### calcFPS: fpsCounter equ $+1 ld a, 00 inc a ld (fpsCounter), a in a, (04) bit 5, a jr z, didntChange initFPS: ld a, $47 out ($30), a xor a out ($31), a ld a, 8 out ($32), a ld a, (fpsCounter) ld (fpsFinal), a xor a ld (fpsCounter), a didntChange: fpsFinal equ $+1 ld a, 00 ret ;;;;;;;;;;;;;;;;;;;;;;;;;;;; Textures ;;;;;;;;;;;;;;;;;;;;;;;;; Texture: .db %11111111 .db %11010101 .db %10101011 .db %11010101 .db %10101011 .db %11010101 .db %10101011 .db %11111111 .end

aeTIos · « **Reply #9 on:** November 17, 2011, 01:38:46 pm »

Code + spoiler in chrome

ben_g · « **Reply #10 on:** November 17, 2011, 01:46:26 pm »

Quote from: aeTIos on November 17, 2011, 01:38:46 pm

Code + spoiler in chrome

I replaced the [code] tags with [tt] tags. I hope that's better.

Author Topic: clipping (Read 7978 times)

ben_g

clipping

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jacobly

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