how to measure the FPS in asm?

[FloppusMaximus]

Well, if "sprite" is a label, then ".dw sprite" stores the address of that label in two consecutive program data bytes. It most certainly does work. It apparently doesn't do what you want it to, though.

In any case, let's step back a bit. What are you trying to do? There is probably a better way to do it.

[darkstone knight]

im buiding a platformer... it draws sprites wich data is at location IX
example:

data of someting animated:
.dw 20 ;ypos (2 byte)
.db 5 ;xpos
.dw sprite ;adress of the sprite
.db %00000011 ;amound of frames (gs, no interupts)
.db more stuff...


when im drawing a sprite:
LD HL,sprite
DOES draw the correct sprite, but
LD H,(ix+4)
LD L,(ix+3)
does not
(or even LD HL,data+3)

[FloppusMaximus]

Well, no, "ld hl,data + 3" is not what you want at all. "ld h,(ix+4) / ld l,(ix+3)", though, is correct. So something else must be going wrong. Are you sure that IX is pointing to the right place? (You aren't, say, calling VPutMap, or some sprite routine that uses IX, are you?)

[magicdanw]

Question: where is IX pointing to? Is it pointing to a table of addresses, or something else? I think you need to show us more of your code, since what you've posted looks okay sofar (assuming IX points correctly).

Oh, here's a tip: the debugger is your friend. If tbewrong values are being loaded into hl, find out what they are. See if they look familiar. See what's at thatmemory location. This will help you get a better grasp on what it is your program is doing.

[darkstone knight]

IX is pointing to the start of the data block, i made my sprite routine so it takes the values in IX+someting

it works for everyting (xpos, ypos, frame...) except the location of the sprite

...
LD IX,stuff
call drawsprite
...
...
stuff:
.dw 20 ;ypos (2 byte)
.db 5 ;xpos
.dw sprite ;adress of the sprite
.db %00000011 ;amound of frames (gs, no interupts)
.db more stuff...

[darkstone knight]

bump my project is on-hold untill it fixed this..

[magicdanw]

As I see it, IX+3 and IX+4 point to bytes pointing to the location of the sprite. Suppose the address is 1234h. When you load IX+4 into H and IX+3 into L, HL should store 1234h. Then, if you try to display the sprite starting at (HL), it should work fine. If it's not, I'm going to have to look at your drawsprite routine.

[darkstone knight]

no wait, i solved it -.-

the problem was this:
...
LD HL,sprite
;LD L,(IX+location+1) ;location
;LD H,(IX+location)
ADD HL,DE
...
this works, but as soon as i uncommented those 2 instructions (that SHOULD point to the same data block, it stopped working
a little endian ...

sorry for begging for help

screenies: (yay) running @ 66 FPS
[attachment=2501:attachment]

edit: yes, that is grayscale

[asdf]

Well, the code should work if you had it structured like this:

[darkstone knight]

location is equal to 3

IX is equal to the adress where the data is stored

[asdf]

Err.. looking back it seems you mixed the values up when loading it to HL. L should = location and H should = location+1.

[tr1p1ea]

Is that a custom grayscale routine or is it RPG or something? If you measured the fps in wabbit and its an interrupt driven grayscale routine you're using then the fps wont be representative of your game. It will be showing you how fast the grayscale rutine is updating the screen.

Looks cool btw .

[darkstone knight]

[darkstone knight]

another quistion >.>

pressedright:
LD DE,(scrolly)
LD HL,(mapwidth)
OR a ;res carry
SBC HL,DE
jr NZ,skip
LD HL,(scrolly)
INC HL
LD (scrolly),HL
CALL ScrollR
skip:
<input inefficient routine here>

scrolly: .dw 8
mapwidth: .db (14-12)*8

for some reason this fails >.>
the routine does either:
ALWAYS execute scrollR (whit NZ as condition)
NEVER execute scrollR (whit Z as condition)

[FloppusMaximus]

Hmm, well, I'm not sure what you're trying to do there, but if mapwidth is supposed to be a 16-bit variable, it should be a .dw...

[darkstone knight]

a, you are correct >.>

always messing up those small things ...

[darkstone knight]

yet, another quistion :D


drawR:
LD HL,(scrollY)
or a\ RR H\ RR L ;divide by 8
or a\ RR H\ RR L
or a\ RR H\ RR L
LD DE,12
ADD HL,DE ;add 12
LD DE,tilesprites
ADD HL,DE
EX DE,HL

EXX
LD DE,plotsscreen+13
EXX

LD B,8 ;bitcounter
drawRloop:
push BC
LD a,(DE) ;de is tilemap
LD L,A
LD H,0
ADD HL,HL ;maal 8
ADD HL,HL
ADD HL,HL
LD BC,tilesprites
ADD HL,BC
push HL
EXX
pop HL
CALL putsprite8 ;DE will update self
EXX
LD HL,20 ;tilemap is 20 wide..
ADD HL,DE
EX DE,HL

POP BC
djnz drawRloop
RET
this is the code to draw the RIGHT part of the screen, it is trigered when (scrollY) mod 8 equals zero

im using an 14-bit whide buffer

putsprite8 is just one small routine that does LDI, and advances DE to the next row