C/C++ Programming Help Thread

[SG57]

If you mean cut a sprite sheet up then yes, you can...

You use the offsets to do it...

Image dimensions of 100x100. Cut it in 2...

use the offsets for the first image ( 0, 50 )

Im jsut guessing on the use of the offsets, but i do know you use them to cut a sprite sheet up...

[ZereoX]

Hi, I learn lua quit a wild ago but im more interested in C/C++ where can i start i mean which are the best tut to start whit.

[SG57]

ok... go to www.psp-programming.com thats where all the actual developers chill now a days youll find tutorials to get you started, then examples and general help on how to code in C/C++... even LUA, this forum hasnt really any real hardcore LUA dev's that dont know about psp-programming.com ...

This forum is now more of a release thread...

[SodR]

Originally Posted by SG57

If you mean cut a sprite sheet up then yes, you can...

You use the offsets to do it...

Image dimensions of 100x100. Cut it in 2...

use the offsets for the first image ( 0, 50 )

Im jsut guessing on the use of the offsets, but i do know you use them to cut a sprite sheet up...

Yes, of course you can do that. How stupid of me. Thanks anyway.

[SG57]

Mental blocks are pretty common in programming i guess...

[SodR]

When I try to animate a screen the second picture in the animation is displayed below the first one instead of on it.

This is the animation code:

	char intro_buffer[200];
	Image* intro;
	sprintf(intro_buffer, "./Intro.png");
	intro = loadImage(intro_buffer);

	char white_buffer[200];
	Image* white;
	sprintf(white_buffer, "./white.png");
	white = loadImage(white_buffer);

	screenblit(0, 0, 480, 272, white, 0, 0);
	screenblit(0, 0, 248, 59, intro, 120, 120);
	flipScreen();
	sceKernelDelayThread(1000000);

	screenblit(0, 0, 480, 272, white, 0, 0);
	screenblit(0, 59, 248, 118, intro, 120, 120);
	flipScreen();
	sceKernelDelayThread(1000000);

	screenblit(0, 0, 480, 272, white, 0, 0);
	screenblit(0, 118, 248, 177, intro, 120, 120);
	flipScreen();
	sceKernelDelayThread(1000000);

	screenblit(0, 0, 480, 272, white, 0, 0);
	screenblit(0, 177, 248, 224, intro, 120, 120);
	flipScreen();
	sceKernelDelayThread(1000000);

This is the screenblit function. I borrowed it from FlashMod and added a function to it so you can choose where to display the image (this might be the problem?):

void screenblit(int posx, int posy, int sizex, int sizey, Image* imagevar, int dx, int dy) {
	int x = 0;
        int y = 0;
        sceDisplayWaitVblankStart();

	while (x < sizex) {
		while (y < sizey) {
			blitAlphaImageToScreen(posx ,posy ,sizex , sizey, imagevar, dx, dy);
			y += sizey;
		}
		x += sizex;
		y = 0;
	}
}

Thanks in advance.

btw. the sceKernelDelayThread() is just temporary used. I'm just using it with my testings.

[SG57]

1. Put your images into an array for animation.
2. Dont flip the screen/draw buffer more then once (when animating)
3. Try this for a crappyly timed timer, and i havent tested it, its raw code i havent tested:

Image* animation[2];
animation[0] = loadImage("./Intro.png");
animation[1] = loadImage("./white.png");
 
actualImage = animation[0];
 
int x = 0, fakeTimer = 0;
 
while(1) {
	  screenblit(all that jazz here, animation[x], all that jazz here);
	  if (fakeTimer > 500 && fakeTimer<1000) x=1;
	  else {
		  x=0;
	  }
	  if (fakeTimer > 1000) { fakeTimer = 0;
}

Try that or soimething allong the lines... oh and there blitting lower because you put eah image's Y co-ordinate higher then the other one, thus meanig it slower on the screen since the Y value it upside down.

[SodR]

Thanks for the good example. But is there a way to do that with one "master" image ( that contains several sprites ) and ripping seperate sprites out of it??

[kozine]

Ok this sounds dumb but, is it:

pspWaitVblankStart();

??
I cant remember what it was lol.

[SodR]

Originally Posted by kozine

Ok this sounds dumb but, is it:

pspWaitVblankStart();

??
I cant remember what it was lol.

It's

 sceDisplayWaitVblankStart();

[kozine]

ok thankyou

[SodR]

Originally Posted by kozine

ok thankyou

No problem. This thread is about helping, right?

[kozine]

sceDisplayWaitVblankStart();

is it in mili seconds? If so, how many mili seconds to a second?

(Yes I know im dumb )

[SodR]

Originally Posted by kozine

sceDisplayWaitVblankStart();

is it in mili seconds? If so, how many mili seconds to a second?

(Yes I know im dumb )

1000mili secs = 1sec.

[FreePlay]

Originally Posted by SodR

1000000mili secs = 1sec.

Um, no. 1000ms = 1s. mili = thousandth.

[SodR]

Originally Posted by FreePlay

Um, no. 1000ms = 1s. mili = thousandth.

Yes, my mistake. What I said was in micro secs.

Now it's edited =)

[SodR]

Does anyone have any tips of speeding up your program except changeing the cpus clock frequency?? (It mainly goes slow because of that it have many big images blited to the screen).

[kozine]

Ok guys im in need of help. Im trying to compile my program and it says:

main.c:391: error: syntax error at end of input

Line 391 is the very last line. Here is the last 4 lines (as I dont want people to see my code)

	// Exit Program

	while (1) {
		sceCtrlReadBufferPositive(&pad, 1);
		if (pad.Buttons & PSP_CTRL_CROSS) {

		      MP3_Stop();
		      MP3_FreeTune();
			sceKernelExitGame();
			break;
				}
			}

	return 0;

}

[SG57]

kozine - Its not necessarly your last lines that is making the error... the Complier here is complaining you have left a '{' bracket open, or added an extra '}' somewhere, my advice is to get a good code editing software (UltaEdit or Dev-C++) and it will highlight the backets start and finish ones, that way you can find the problem... Hope this helps.

[kozine]

Thanks I got that sorted out and some other errors and it compiles now Thankyou SG57!

[SG57]

Thats what this thread is for.

Originally Posted by SodR

Does anyone have any tips of speeding up your program except changeing the cpus clock frequency?? (It mainly goes slow because of that it have many big images blited to the screen).

yes, i have some...

1. Use external globals to help not make a brand new C source file just to have the same variable in 2 files
2. Use static variables instead of configuration files, that way theres no need to read/write from the mem stick for an always changing/same starting position variable...

[SodR]

How do you use ascii with flib??

eg.

 text_to_screen("  %s\n", dirEntry->d_name, 350, 50);

doesn't work =S. Samstag told me that ascii was supported in flib. I get the "to many arguments to function" error...

[SG57]

..SodR, flib is for displaying True Type Fonts (TTF), no?

The prototype for the text_to_screen doesnt support optional parameters, there for you must feed the diretory names and the '\n' character into na buffer before printing:

char buffer[255];
struct dirent *dirEntry;
sprintf(buffer, " %s\n", dirEntry->d_name);
text_to_screen(buffer, 350, 50);]

hope that helps...

Oh and if your going to be changing directories, make sure you 'sprintf' again, orelse the 'd_name' / file list, wont be updated to display the n ewe files in the new folder...

[Samstag]

Originally Posted by SodR

How do you use ascii with flib??

eg.

 text_to_screen("  %s\n", dirEntry->d_name, 350, 50);

doesn't work =S. Samstag told me that ascii was supported in flib. I get the "to many arguments to function" error...

You still seem to be confused about ascii. Your example shows printf escape codes, not ascii.

text_to_screen(dirEntry->d_name, 350, 50);

This is all you need to do in this case.

[SG57]

Samstag - no, not neccesarly, that will print out the filenames, but no enter character, thus making it all one line...

(Unless the structure itself has a built in \n but i have tried it wihtout and it doesnt...)

[Samstag]

Originally Posted by SG57

Samstag - no, not neccesarly, that will print out the filenames, but no enter character, thus making it all one line...

(Unless the structure itself has a built in \n but i have tried it wihtout and it doesnt...)

The variable dirEntry->d_name is a single filename, not a list of names.

If you send \n to flib, you'll get a backslash and an "n".

[SG57]

Well i was assuming he was displaying the entire list of the filenames in the directory via a 'for' loop... meaning each time the loop repeated, it print the next filename, one line below...

[SodR]

Originally Posted by Samstag

You still seem to be confused about ascii. Your example shows printf escape codes, not ascii.

text_to_screen(dirEntry->d_name, 350, 50);

This is all you need to do in this case.

I have never acctually used those kind of stuff very much but in my program I needed to use those functions. Thanks for informing me what it's called anyway.

Originally Posted by Samstag

If you send \n to flib, you'll get a backslash and an "n".

Then what do you use for newline??

[Samstag]

Originally Posted by SodR

Then what do you use for newline??

Change the Y value when you send the next line. You start with a Y value of 50 in your example. If you're using a 14 point font you could probably add 16 for each new line like this:

int y = 50;

for(i = 0; i < NUMBER_OF_LINES; i++)
{
        text_to_screen(line[i], 350, y);
        y += 16;
}

I'll probably add simple support for newlines in a later version.

[SodR]

Originally Posted by Samstag

Change the Y value when you send the next line. You start with a Y value of 50 in your example. If you're using a 14 point font you could probably add 16 for each new line like this:

int y = 50;

for(i = 0; i < NUMBER_OF_LINES; i++)
{
        text_to_screen(line[i], 350, y);
        y += 16;
}

I'll probably add simple support for newlines in a later version.

When I do like this I get a "makes pointer from integer without a cast" error. I can't figure out why. Do you know what to do to fix this?

btw. I assume that "i" is an integer with a value of 0 ( int i = 0; )