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16

ASM / clipping

« 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.

17

Computer Projects and Ideas / Base Converter (also works for signed and fixed-point numbers)

« on: October 21, 2011, 04:17:35 pm »

Everybody who programs z80 or an other low-level programming language has to do a lot of converting between decimal, binary and hexadecimal numbers. This can easily be done by using the windows calculator with normal integers, but when you use signed integers or fixed-point numbers, it gets harder, and takes more time to calculate them. Because I have to do that a lot, I decided to make a tool which can convert all kinds of binary, hexadecimal and decimal numbers to each other, including fixed-point and signed numbers, and I thought this might be useful to other people too, so I decided to distribute it.

It's easy to use it: You just select the base of the input and output, you check if the numbers are signed, select the form (integer or fixed-point) and click the convert key.

For now, the number of bits is ignored, so you may have to use only the last few characters ore add prefix zero's, but it can

And here's the link to the program itself:
http://dl.dropbox.com/u/11215358/base%20converter.jar
It's a java program and uses no libraries, so it should work on all operating systems, when java is installed.

Do you find bugs or do you have problems with this program? please post. If you find this program completely useless and you think I shouldn't have distributed it, please post too.

18

ASM / 16 by 24 bit signed addition

« on: October 02, 2011, 03:24:44 pm »

Hi,

I'm trying to do a 16 by 24bit signed addition for my z80 program. Now I have this code:

Code: [Select]

  ld hl,(var1)
  ld de, (var2)
  ld a, h
  rla
  sbc a,a
  add hl, de
  ld b, a
  ld a, (var1+2)
  adc a, b
  ld (var1+2), a

It seems to work in some situations, but it also sometimes gives other results.
What am I doing wrong?

btw: var1 is the 24bit var, var2 the 16bit one. I haven't fully written this routine, a part of it comes from a load 16bit to 24bit routine from calc84maniac.

many thanks in avantage.

19

Math and Science / interpolation

« on: July 29, 2011, 06:02:02 pm »

I want to calculate the value of a point, based on the position of the point between 4 other points with each an other value.
an image to illustrate what I'm trying to say:

In this image, there are 4 points with a given value of a and a point between those 4 points which has got an unknown value of a. I now want to know how i can calculate value a of that point, based on the position of that point so that when x=x1 and y=y1, a=a1=1, and when x=x2 and y=y2, a=a2=2, and so on. And when point (x,y) is in the middle of (x1,y1) and (x2,y2), a should be the average of a1 and a2, so a=1.5.

Is there a formula which i can use to interpolate the a value of a point between the a values of the other points?

20

Computer Projects and Ideas / Back to cretaceous

« on: July 20, 2011, 02:09:09 pm »

Back to Cretaceous is a java game which i'm working at with a few friends. The engines are almost done, so now we have to start working at the graphical part. There is still one problem: We can't agree on how the dinosaurs wil look like, so we decided to append a poll. There are three possibilities:
- Scales: The dinosaurs will have a scaled skin, which will make them look like giant reptiles. This is how almost everybody thinks abouth dinosaurs.
- Feathers: Te dinosaurs will have feathers, which will make them look more like birds. Recent investigation has proved that some small dinosaurs had feathers. Weather the big dinosaurs had feathers is still uncertain.
- A mix of the two: small dinosours will have feathers (becouse that's proven) and the big ones will still look like giant reptiles (becouse that's how everybody thinks abouth dinosaurs).

I'm not saying which one I prefer becouse that could have influence on the results, which isn't fair, so please don't ask for it.

21

Computer Programming / Setting the background of a JFrame

« on: July 16, 2011, 10:52:48 am »

I'm trying to set the background color of an undecorated JFrame to black, but the SetBackground methot does nothing.

My Window creation code:

Code: [Select]

JFrame.setDefaultLookAndFeelDecorated(true);
    Loading = new JFrame("");
    Loading.setAlwaysOnTop(true);
    Loading.setLayout(null);
    Loading.setUndecorated(true);
    Loading.getRootPane().setWindowDecorationStyle(JRootPane.NONE);
    JLabel LoadingText = new JLabel("Loading... - Please wait.");
    LoadingText.setBounds(250,0,500,15);
    LoadingText.setHorizontalAlignment((int)JFrame.CENTER_ALIGNMENT);
    LoadingText.setForeground(Color.WHITE);
    LoadingBar.setMinimum(0);
    LoadingBar.setMaximum(100);
    LoadingBar.setValue(0);
    LoadingBar.setForeground(Color.GREEN);
    LoadingBar.setBackground(Color.RED);
    LoadingBar.setBounds(0,30,1000,30);
    Loading.getContentPane().add(LoadingText);
    Loading.getContentPane().add(LoadingBar);
    Loading.setBounds(Toolkit.getDefaultToolkit().getScreenSize().width/2-500,Toolkit.getDefaultToolkit().getScreenSize().height/2-100,1000,200);
    Loading.setBackground(Color.BLACK);
    Loading.setFocusable(true);
    Loading.setVisible(true);

And this is the result:

You can see that the SetBackground method hasn't done anything. Is there a way to make the background of a JFrame black?

22

OmnomIRC Development / omnom does strange stuff

« on: June 18, 2011, 07:34:13 pm »

omnomIRC just keeps scrolling trough empty lines, and refreshing won't solve it

23

ASM / Texture drawing

« on: June 13, 2011, 04:29:29 pm »

Does anybody knows how to draw repeated textures? It would help a lot at my 3D engine, which now can only render wireframe.

I only need to know how it's done, so I can write my own routine.

What I mean with textures: this is a wire frame rectangle rendered by my 3D Engine:

I want to draw a sprite between those 4 points. Could someone explain the principle behind this please?

24

ASM / an other assembly question

« on: June 04, 2011, 07:33:52 pm »

I don't really get this:

Clears ram	doesn't clear the ram
Code: [Select] `ld hl, (screenx) ld d, 1 ld e, 0 call SubFP ld b, h \ ld c, l ld de, 94 call MulFP ld (screenx), hl ld hl, (screeny) ld d, 1 ld e, 0 call SubFP ld b, h \ ld c, l ld de, 62 call MulFP ld (screeny), hl ret`	Code: [Select] `ld hl, (screenx) ;ld d, 1 ;ld e, 0 call SubFP ld b, h \ ld c, l ld de, 94 call MulFP ld (screenx), hl ld hl, (screeny) ;ld d, 1 ;ld e, 0 call SubFP ld b, h \ ld c, l ld de, 62 call MulFP ld (screeny), hl ret`

In the left part, it clears the ram, while in the right part, it doesn't clear the ram while i have only comented out a few ld commands.

coul someone help please?

25

TI-Boy SE - Game Boy Emulator For TI-83+SE/84 / how to get games working on tiboy?

« on: June 03, 2011, 05:09:36 pm »

I've recently downloaded tiboy, but every rom i compiled was much larger than the total amounth of memory available(even with no programs on it).

So are there actually some game boy games that fit on a ti-84 plus, or do ti-boy games only fit on a silver edition calc?

26

ASM / please help me with fixed-point math

« on: May 20, 2011, 05:22:57 pm »

Hi,
I am trying to port a simple 3D engine from GML to z80, but I can't get it to work
I think my fixed-point math routines aren't doing what they are supposed to do. Can enybody please help with that?

This is what it should do:

(speed so low becouse of the recording software. The engine itself renders very efficiently)

And what i got is just an emty screen, while the camera is 5 units away, facing the target, and everything between 1 and 256 units should be visible.

The math currently being unsigned might be one problem, but i couldn't find any 16bit signed fixed-point routines with google.

Spoiler For assembly InitView routine:

Spoiler For assembly 3DTo2D routine:

Spoiler For assembly math routines:

Has enybody got some routines for this on their hard drive (you will get credits for it) or can enybody gelp me with writing my own?

BTW: I added the exe for if enybody wants to try the engine itself (sorry for the ones withouth windows, but GM can only compile exe's)

EDIT: I forgot to say the controls: use z, q, s and d to walk and turn

27

General Calculator Help / Ti-84 plus operating systems

« on: May 18, 2011, 03:08:37 pm »

Hi everybody,

I just noticed the download links to different OSes of the ti-84 plus
I am using Os 2.22, but I found 2.43 and 2.55. So i want to know: has enybody ever tried these OSes, and what are the new features? And how's the compatibility for asm programs?

28

ASM / my routine clears ram

« on: May 11, 2011, 03:56:58 pm »

Hi,

I've got an other problem: my routine clears the ram, and I don't know why...
from 'learn ti83plus asm in 28 Days', i know that ram clears usually appear when you used the stack incorrect, but I've counted all the pushes and pops of the routine, and there were as much pushes as pops. Further is the mem for all the vars stored in the program itself, so it can't be becouse i'm editing mem that shouldn't be edited.

It's just calculating with registers and vars, but i don't know how that can clear the ram.

anyway, here's my code

Code: [Select]

3DTo2D:
  ld a, 0
  ld (valid), a
  ld bc, (xpoint)
  ld de, (xfrom)
  call SubFP
  ld (xpoint), de
  ld bc, (ypoint)
  ld de, (yfrom)
  call SubFP
  ld (ypoint), de
  ld bc, (zpoint)
  ld de, (zfrom)
  call SubFP
  ld (zpoint), de
  ld hl, (xpoint)
  ld bc, (xto)
  call MulFP
  push de			;1
  ld hl, (ypoint)
  ld bc, (yto)
  call MulFP
  pop hl			;0
  add hl, de
  push hl			;1
  ld hl, (zpoint)
  ld bc, (zto)
  call MulFP
  pop hl			;0
  add hl, de
  push hl			;1
  ld a, l
  ld c, a
  ld a, (min_range)
  ld b, a
  ld a, c
  cp b
  jp c, Invalid
  ld c, a
  ld a, (max_range)
  ld b, a
  ld a, c
  cp b
  jp nc, Invalid
  ld a, 1
  ld (valid), a
  ld hl, (xpoint)
  ld bc, (xcross)
  call MulFP
  push de			;2
  ld hl, (ypoint)
  ld bc, (ycross)
  call MulFP
  pop hl			;1
  add hl, de
  push hl			;2
  ld hl, (zpoint)
  ld bc, (zcross)
  call MulFP
  pop hl			;1
  add hl, de
  pop de			;0
  push de			;1
  call DivFP
  ld (screenx), hl
  ld hl, (xpoint)
  ld bc, (xup)
  call MulFP
  push de			;2
  LD HL, (ypoint)
  ld bc, (yup)
  call MulFP
  pop hl			;1
  add hl, de
  push hl			;2
  ld hl, (zpoint)
  ld bc, (zup)
  call MulFP
  pop hl			;1
  add hl, bc
  pop de			;0
  call DivFP
  ld (screeny), hl
  ld hl, $0100
  ld de, (screenx)
  add hl, de
  ld bc, $5F00
  call MulFP
  ld (screenx), de
  ld hl, $0100
  ld de, (screeny)
  add hl, de
  ld bc, $4100
  call MulFP
  ld (screeny), de
Invalid:
  ret

btw: the commented numbers show the amount of items put on the stack by this routine.

29

ASM / compiletime errors

« on: May 08, 2011, 03:10:54 pm »

Hi everybody!

I recently started with asm, and i have some compiletime errors of which i don't know how to solve them.

my code:

Code: [Select]

InitView:
  ;call once every frame, before 3DTo2D
  ld hl, (xto)
  ld bc, hl
  ld hl, (xfrom)
  ld de, hl
  call SubFP
  ld hl, de
  ld (xto), hl
  ld hl, (yto)
  ld bc, hl
  ld hl, (yfrom)
  ld de, hl
  call SubFP
  ld hl, de
  ld (yto), hl
  ld hl, (zto)
  ld bc, hl
  ld hl, (zfrom)
  ld de, hl
  call SubFP
  ld hl, de
  ld (zto), hl
  ld hl, (xto)
  ld bc, hl
  call MulFP
  ld ix, de
  ld hl, (yto)
  ld bc, hl
  call MulFP
  ld hl, de
  ld bc, ix
  add hl, bc
  ld ix, hl
  ld hl, (zto)
  ld bc, hl
  call MulFP
  ld hl, de
  ld de, ix
  add hl, de
  call sqrtFP
  ld de, hl
  ld hl, (xto)
  push de
  call DivFP
  pop de
  ld (xto), hl
  push de
  ld hl, (yto)
  call DivFP
  pop de
  ld (yto), hl
  ld hl, (zto)
  call DivFP
  ld (zto), hl
  ld hl, (xto)
  ld bc, hl
  ld hl, (xup)
  call MulFP
  ld ix, de
  ld hl, (yto)
  ld bc, hl
  ld hl, (yup)
  call MulFP
  ld hl, de
  ld bc, ix
  add hl, bc
  ld ix, hl
  ld hl, (zto)
  ld bc, hl
  ld hl, (zup)
  call MulFP
  ld hl, af
  add hl, de
  push hl
  ld hl, (xto)
  ld bc, hl
  pop hl
  push hl
  call MulFP
  ld hl, (xup)
  ld bc, hl
  call SubFP
  ld hl, de
  ld (xup), hl
  ld hl, (yto)
  ld bc, hl
  pop hl
  push hl
  call MulFP
  ld hl, (yup)
  ld bc, hl
  call SubFP
  ld hl, de
  ld (yup), hl
  ld hl, (zto)
  ld bc, hl
  pop hl
  call MulFP
  ld hl, (zup)
  ld bc, hl
  call SubFP
  ld hl, de
  ld (zup), hl

the errors:
Assembling...
Pass 1 complete. (330ms).
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:61]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:63]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:65]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:68]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:70]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:72]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:75]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:77]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:79]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:82]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:84]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:86]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:88]
Error: Could not parse expression 'ix' (Invalid number). [zztemp.asm:89]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:91]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:93]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:95]
Error: Could not parse expression 'ix' (Invalid number). [zztemp.asm:96]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:99]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:114]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:117]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:119]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:122]
Error: Could not parse expression 'ix' (Invalid number). [zztemp.asm:123]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:125]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:127]
Error: Could not parse expression 'af' (Invalid number). [zztemp.asm:130]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:134]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:139]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:141]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:144]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:149]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:151]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:154]
Error: Could not parse expression 'hl' (Invalid number). [zztemp.asm:158]
Error: Could not parse expression 'de' (Invalid number). [zztemp.asm:160]
Pass 2 complete. (163ms).
Errors: 36, Warnings: 0.
Build failed.

Topics - ben_g

ASM / clipping

Computer Projects and Ideas / Base Converter (also works for signed and fixed-point numbers)

ASM / 16 by 24 bit signed addition

Math and Science / interpolation

Computer Projects and Ideas / Back to cretaceous

Computer Programming / Setting the background of a JFrame

OmnomIRC Development / omnom does strange stuff

ASM / Texture drawing

ASM / an other assembly question

TI-Boy SE - Game Boy Emulator For TI-83+SE/84 / how to get games working on tiboy?

ASM / please help me with fixed-point math

General Calculator Help / Ti-84 plus operating systems

ASM / my routine clears ram

ASM / compiletime errors