Oh, okay. Thanks for the tip.

Including that piece of code so I can look over it for you. Here it is properly formatted:


Code:
See how much easier that is to read? There's a lot of optimizations that could be made there, but it is indeed more or less functionally identical to what I had written. Good job!

Nice, thanks for confirming!

I would like to know how to do 3- and 4-lv grayscale.

Well, you need a bunch of things, then:

1) A grayscale engine. This is in the form of an interrupt that periodically copies from one of two buffers to the LCD, plus routines to set up and tear down the interrupt. I'm partial to Jim E's Grayscale Programming Package 1.1.
2) Two buffers, 768 bytes each
3) Sprite routines that are capable of copying to both buffers
4) Other grayscale-aware graphics routines
5) Understanding that you lose 50-80% of the CPU time to the grayscale routines

ouch. thats a lot of things. how do you do copying to both buffers?

Well, Jim E's GPP comes with PutSprite and LargeSprite routines that do it for you, but you have to use your own routines if you want to do other tricks.

Thanks.

Can you use set 4,A to set bit 4 of register A?

That's exactly what it's for! And res 4,a resets bit 4, and bit 4,a sets the z flag if bit 4 of a was zero.

Thanks! I thought it was only for flags. (But they are effectively the same )

They are exactly the same, in fact! The only difference is that the bytes that store flags are offsets in memory from the iy register instead of registers like a.

How do I draw a 16x16 clipped sprite?

Gah! Stop double posting. If you have new content to add, just edit your previous post if it hasn't been at least 24 hours.

To answer your question, to be quite honest, I haven't done this yet (correctly). I would look at the iPutSprite routine (the one with clipping) and see how it checks for bounds, and then try and extend it for 2 bytes width. Or, the better answer that doesn't involve reinventing the wheel, use the iLargeSprite routine. (Protip: This one is easier )

Heartily seconded. It gets very tedious to merge people's posts together, and I wouldn't blame Tanner if he started just deleting double-posts from repeat offenders.

Neither iPutSprite nor iLargeSprite does clipping. Vertical clipping is easy: if you're close to the bottom, you just lower the number of rows specified for display; if you're above the top, you offset the beginning of the sprite as you lower the number of rows until the top is onscreen. Left and right are harder, and can be done with techniques such as bitshifting the sprite or doing careful bitmasking.

Okay, thanks. I'll take care not to double-post again
About vertical clipping, I discovered this myself. The horizontal will get harder, though...

Edit: also, I already use Ilargesprite.

Edit2: I want to create a direct input routine like this:
Pseudocode:

Code:

Imo, this is the best way to do it. any suggestions to do it better?

Okay, I have this code and when I compile it it gives a freaking huge file (37.5 kB )
I opened the file and it was just ÿ's.
This code:

Code:

Any clue what I did wrong?
Thanks!

What's #define TASM for?

Uh, I ripped it from another source code (docde7)
I'll see if removing it works.
Edit: did not work, still 39.5 kB of compiled code

What's in "Useful_Routines_.inc"?