KNES library for CC65 (aka Programming the NES in C)

[3gengames]

wouldn't a BASIC-type OS that also could translate to 6502 ASM on the same system work a bit better then C?

Work better in what sense? I think it's bit of an apples and oranges situation...

Well....compile better. Because basic would need more commands, but each one would translate into less instuructions and allow for more editable code to be written, not running whole functions and such....but what do I know. I just know TRS-80 basic isn't too bad!



I'm going to have to get into this some time....and the hit detection would be nasty to write in BASIC I guess....maybe this would be alot better? Anyway this is really cool.

[tepples]

Then perhaps we need a scripting language with specialized data types for games. These might include points and rectangles, where operator AND performs intersection: rect AND point returns true iff point is within rect, and rect AND rect returns their intersection. Then hit detection would be a matter of computing two objects' hitboxes and ANDing them together.

[3gengames]

Well, not need...but like that.....more lightweight functions. The C program can do it though so maybe this'll get easier like basic as it goes, who knows?

[Bregalad]

Another issue with C is debugging. If you have a bug in your C code, it will be harder to find in FCEU's debugger than if you did an error in your assembly code.

[3gengames]

Another issue with C is debugging. If you have a bug in your C code, it will be harder to find in FCEU's debugger than if you did an error in your assembly code.

Great point. I have a hard time understanding my assembly. I'd hate to run through a compilers!

[thefox]

Another issue with C is debugging. If you have a bug in your C code, it will be harder to find in FCEU's debugger than if you did an error in your assembly code.

http://nesdev.com/bbs/viewtopic.php?t=6773

Works fine with C sources too. I'm not sure about the version posted there but I have it working here...

[tepples]

Any debugger that allows importing a file with labels and comments can in theory be used for source-level debugging.

[Chainclaw]

Hey, this demo is awesome, and really got me moving on getting some NES development started. I'm learning a lot, and having a completed demo like this with player movement, scrolling, and collision is fantastic. I'll probably make a thread in the new users forum soon with specific questions about getting things to happen in this demo, things like how do I generate new levels for this, or how do I fully implement left scrolling.

[dirtyHippy]

Greetings, I am having trouble getting knes working - I'm sure it's something simple that I'm overlooking. My process so far has been:
* Install cc65 from the latest snapshot, set up w/ env variables etc
* Copy nes.lib from cc65 into knes/original, make knes
* Copy knes.lib and knes.h, nes-nrom.cfg into appropriate folders
* Edit nes-nrom.cfg as per this post
* Copy header.h and header.c to my project directory
* Attempt to compile my project:

Code: Select all

//HAI2.c

#include "conio.h"
#include "knes.h"

int main(void) {
	clrscr();
	cprintf("OHI");
	while(1) {}
	return 0;
}

Code: Select all

cl65 -t none -C nes-nrom.cfg -o HAI2.nes HAI2.c header.c knes.lib 
Unresolved external `_clrscr' referenced in:
  HAI2.s(14)
Unresolved external `_cputc' referenced in:
  vcprintf.s(9)

Any ideas as to what I'm missing?

[thefox]

Code: Select all

//HAI2.c

#include "conio.h"
#include "knes.h"

int main(void) {
	clrscr();
	cprintf("OHI");
	while(1) {}
	return 0;
}

KNES doesn't support conio.h routines, sorry. If you want to print something you have to write directly to PPU via PPU_ADDR() and PPU.data.

[dirtyHippy]

KNES doesn't support conio.h routines, sorry. If you want to print something you have to write directly to PPU via PPU_ADDR() and PPU.data.

I knew it was something simple . Thanks for the quick reply

[Petruza]

Hey it's great to see someone picked up the idea!
Keep it up!

[frantik]

cool.. too bad my c is so rusty

[thefox]

Posted version 0.1.1 in the website (see first post) to fix problems which were discussed in this thread. In other words it now works with the latest dev version of CC65...

[Shiru]

Looked at the game demo and its sources, it is really cool. Haven't expected scrolled map engine in C with fullspeed. Especially was impressed with music engine also written in C.