C/C++ Programming Help Thread

[SG57]

My method of drawing a filled circle (note this is just written up, havent tried it if itll work, so give it a shot)

#include <math.h>

#define DEG2RAD 3.14159/180
 
void drawFilledCircle(int x,int y, float radius)
{
   for (int i=0; i < 360; i++)
   {
      float degInRad = i*DEG2RAD;
      drawLineScreen(x+radius,y+radius,cos(degInRad)*radius,sin(degInRad)*radius);
   }
}

Thats if your using graphics library.

[Raphael]

No it won't, and even if it did, it would be a lot slower than the previous code :P

[1337PSPer]

can anyone give me some help on recompiling this code
http://0okm.blogspot.com/2006/11/3rd...in-sample.html
thx mafia1ft

[pspfreak9]

Why dont you compile it??

[hallo007]

how big is flash0 (in bytes) ?

[PSPduh]

how big is flash0 (in bytes) ?

Right here.
I think it is like 20 MB or something but I'm not sure.

[hallo007]

yeah ,a bit more ,but i need to now in bytes exactly and where is the system version name stored?

[2.6,CRACKED!]

well i guess, it checks your sceKernelDevKitVersion number and then does if statements to print to the screen the right one...

[hallo007]

no i mean on flash , so i can reflash it

[SG57]

Raphael - Can you explain your reasoining? Im learning here, and you arent too helpful by not giving a reason :o

[Bennoo]

Hello, I've a problem, When I start the .bat file, then comes this when cygwin says that the program is succesfully installed :

He stays on this part ,, Can someone help me?

Thnxx, Bennoo

*Sorry if this English is a little bit strange because i'm dutchman.*

[yaustar]

Raphael - Can you explain your reasoining? Im learning here, and you arent too helpful by not giving a reason :o

The biggest difference is that you are calling a sin and cos math function 360 times each which is VERY expensive without a LUT. The other snippet didn't use any.

[1337PSPer]

Hello, I've a problem, When I start the .bat file, then comes this when cygwin says that the program is succesfully installed :

He stays on this part ,, Can someone help me?

Thnxx, Bennoo

*Sorry if this English is a little bit strange because i'm dutchman.*

i remember when i was seting up toolchain i had to go find mirors for half the files because they wern't there maybe you will to or you can try my toolchain.sh file http://rapidshare.com/files/12649221/toolchain.sh.html
-= Double Post =-
can some helpme with this code
i got it to compile but when i run it my psp frezzes up

main.c

#include <pspkernel.h>
#include <pspctrl.h>


PSP_MODULE_INFO("HOOK", 0x1000, 1, 1);
PSP_MAIN_THREAD_ATTR(0);




int module_start(int *pad_data, int count, int mode, int ret_data, int *Buff)
{
	unsigned int Buttons = pad_data[1];
	unsigned char Lx = pad_data[2] & 0x000000FF;
	unsigned char Ly = (pad_data[2] & 0x0000FF00) >> 8;
	if (Lx > 0xC0)
	{
		Buttons = Buttons | PSP_CTRL_RIGHT;
	}
	if (Lx < 0x40)
	{
		Buttons = Buttons | PSP_CTRL_LEFT;
	}
	if (Ly > 0xC0)
	{
		Buttons = Buttons | PSP_CTRL_DOWN;
	}
	if (Ly < 0x40)
	{
		Buttons = Buttons | PSP_CTRL_UP;
	}
	pad_data[1] = Buttons;



	return 0;
}

makefile

TARGET = screenshotbmp
OBJS = main.o

BUILD_PRX=1


INCDIR = 
CFLAGS = -Os -G0 -Wall -fno-strict-aliasing -fno-builtin-printf
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)

LIBDIR =
LDFLAGS = -mno-crt0 -nostartfiles
LIBS =

PSPSDK=$(shell psp-config --pspsdk-path)
include $(PSPSDK)/lib/build.mak

[JaSo PsP]

The compiler brings up ALOT of errors, here is the code:

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>

PSP_MODULE_INFO("Buttons", 0, 1, 1); 
 
#define printf pspDebugScreenPrintf 
 
int exit_callback(void) 
{ 
   sceKernelExitGame(); 

   return 0; 
} 
 
void CallbackThread(void *arg) 
{ 
   int cbid; 

   cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL); 
   sceKernelRegisterExitCallback(cbid); 

   sceKernelSleepThreadCB(); 
} 
 
int SetupCallbacks(void) 
{ 
   int thid = 0; 

   thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0); 
   if(thid >= 0) 
   { 
      sceKernelStartThread(thid, 0, 0); 
   } 

   return thid; 
} 

int main() {
    pspDebugScreenInit();
    SetupCallbacks();
    
    int fun = 0;
    int counter = 0;
    int i = 0;
    SceCtrlData pad;
    
    printf("Press X to start the counter");
    
    while(1) {
          sceCtrlReadBufferPositive(&pad, 1);
          if(pad.Buttons & PSP_CTRL_CROSS) {
                         break;
          }
    }
    while(1) {
          sceCtrlReadBufferPositive(&pad, 1);
          if(pad.Buttons & PSP_CTRL_CIRCLE) {
                         break;
          }
          pspDebugScreenClear();
          printf("Press O to stop the counter\n");
          printf("Counter: %i", counter);
          counter++;
          
          for (i=0, i<5, i++) {
              sceDisplayWaitVBlankStart();
          }
    }
    pspDebugScreenClear();
    printf("Counter Finished\n");
    printf("Final Count: %i\n", counter);
    printf("Press TRIANGLE for the next feature");
    
    while(1) {
          sceCtrlReadBufferPositive(&pad, 1);
          if(pad.Buttons & PSP_CTRL_TRIANGLE) {
                         break;
          }
    }
    
    while(1) {
          sceCtrlReadBufferPositive(&pad, 1);
          if(pad.Buttons & PSP_CTRL_CIRCLE) {
                         break;
          }
          pspDebugScreenClear();
          printf("Press X to increase the number, O to stop\n");
          printf("Number: %i", fun);
          if(pad.Buttons & PSP_CTRL_CROSS) {
                         fun++;
          }
    }

    sceKernelSleepThread();
    
    return 0;
}

I'm not exactly using CYGWIN, I installed the psp sdk and im compiling using the start.bat. Will it work when i install CYGWIN on my other computer?

[SG57]

yaustar - But it still drew a filled circle right? Just not as efficiently as another method... Im asking because I want to knwo if my mental calculations were wrong when i was writing that up. I cant check it as Im PSPless- but i suppose I could port it to lua and check it out...

[yaustar]

yaustar - But it still drew a filled circle right? Just not as efficiently as another method... Im asking because I want to knwo if my mental calculations were wrong when i was writing that up. I cant check it as Im PSPless- but i suppose I could port it to lua and check it out...

Nope, I can't see it drawing a circle either.

[PSPduh]

The compiler brings up ALOT of errors, here is the code:

lol code

I'm not exactly using CYGWIN, I installed the psp sdk and im compiling using the start.bat. Will it work when i install CYGWIN on my other computer?

Would you mind posting the errors?

[JaSo PsP]

I sorted my problem out.

[Raphael]

Raphael - Can you explain your reasoining? Im learning here, and you arent too helpful by not giving a reason

My method of drawing a filled circle (note this is just written up, havent tried it if itll work, so give it a shot)

#include <math.h>

#define DEG2RAD 3.14159/180
 
void drawFilledCircle(int x,int y, float radius)
{
   for (int i=0; i < 360; i++)
   {
      float degInRad = i*DEG2RAD;
      drawLineScreen(x+radius,y+radius,cos(degInRad)*radius,sin(degInRad)*radius);
   }
}

Thats if your using graphics library.

This does NOT draw a circle. It draws a bunch of lines from the "center" (x+radius, y+radius) to a number of points that lie between (-radius, -radius) and (radius, radius).

Even if you changed it to draw the lines from center to (center-radius | center+radius) then it would in most cases not be a completely filled circle. Apart from the thousands of times of overdrawing pixels unnecessarily, wasting even more cpu time than for the hundreds of trigonometric function calls.
If you want to draw filled primitves, always try to draw them in horizontal lines.

[1337PSPer]

ok i havn't done anything with pictures latly but when i was about to try i get a strange error saying:
main.c.text+0xc): undefined reference to `loadImage'
main.c.text+0x2c): undefined reference to `blitAlphaImageToScreen'
here is my code

#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspkernel.h>
#include <png.h>
#include <stdlib.h>
#include <stdio.h>
#include <psputils.h>
#include <malloc.h>
#include "graphics.h"

#define printf pspDebugScreenPrintf
#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))

PSP_MODULE_INFO("SHUTDOWN", 0, 1, 1);

int main() {
    char buffer[200];
	Image* splash;
	splash = loadImage("splash.png");
	
blitAlphaImageToScreen(0, 0, 480, 282, splash, 0, 0);
	
	sceKernelSleepThread();

	return 0;

}
/* Exported function returns the address of module_info */
void* getModuleInfo(void)
{
	return (void *) &module_info;
}

any help would be great

[yaustar]

You are not compiling the graphics.c file and/or you are not linking to the graphics.o file that is generated when you compile graphics.c.

[1337PSPer]

$ make
psp-gcc -I/usr/local/pspdev/psp/sdk/include/libc -I. -I/usr/local/pspdev/psp/sdk
/include -O2 -G0 -Wall  -L. -L/usr/local/pspdev/psp/sdk/lib -specs=/usr/local/ps
pdev/psp/sdk/lib/prxspecs -Wl,-q,-T/usr/local/pspdev/psp/sdk/lib/linkfile.prx
main.o graphics.o framebuffer.o /usr/local/pspdev/psp/sdk/lib/prxexports.o  -lps
pdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lpsplibc -lpspnet -lpspnet_inet
-lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkernel -o mymodule.
elf
graphics.o: In function `loadImage':
graphics.c:(.text+0x128): undefined reference to `png_create_read_struct'
graphics.c:(.text+0x148): undefined reference to `png_set_error_fn'
graphics.c:(.text+0x150): undefined reference to `png_create_info_struct'
graphics.c:(.text+0x164): undefined reference to `png_init_io'
graphics.c:(.text+0x170): undefined reference to `png_set_sig_bytes'
graphics.c:(.text+0x17c): undefined reference to `png_read_info'
graphics.c:(.text+0x1a4): undefined reference to `png_get_IHDR'
graphics.c:(.text+0x1e0): undefined reference to `png_destroy_read_struct'
graphics.c:(.text+0x20c): undefined reference to `png_set_strip_16'
graphics.c:(.text+0x214): undefined reference to `png_set_packing'
graphics.c:(.text+0x248): undefined reference to `png_get_valid'
graphics.c:(.text+0x260): undefined reference to `png_set_filler'
graphics.c:(.text+0x2b8): undefined reference to `png_read_end'
graphics.c:(.text+0x2c8): undefined reference to `png_destroy_read_struct'
graphics.c:(.text+0x2e0): undefined reference to `png_set_tRNS_to_alpha'
graphics.c:(.text+0x2f8): undefined reference to `png_read_row'
graphics.c:(.text+0x360): undefined reference to `png_set_palette_to_rgb'
graphics.c:(.text+0x370): undefined reference to `png_set_gray_1_2_4_to_8'
graphics.o: In function `saveImage':
graphics.c:(.text+0xb08): undefined reference to `png_create_write_struct'
graphics.c:(.text+0xb18): undefined reference to `png_create_info_struct'
graphics.c:(.text+0xb2c): undefined reference to `png_init_io'
graphics.c:(.text+0xb5c): undefined reference to `png_set_IHDR'
graphics.c:(.text+0xb68): undefined reference to `png_write_info'
graphics.c:(.text+0xc1c): undefined reference to `png_write_row'
graphics.c:(.text+0xc38): undefined reference to `png_write_end'
graphics.c:(.text+0xc44): undefined reference to `png_destroy_write_struct'
graphics.c:(.text+0xc88): undefined reference to `png_destroy_write_struct'
graphics.o: In function `flipScreen':
graphics.c:(.text+0xce0): undefined reference to `sceGuSwapBuffers'
graphics.o: In function `guStart':
graphics.c:(.text+0xe6c): undefined reference to `sceGuStart'
graphics.o: In function `initGraphics':
graphics.c:(.text+0xe80): undefined reference to `sceGuInit'
graphics.c:(.text+0xe9c): undefined reference to `sceGuDrawBuffer'
graphics.c:(.text+0xeb0): undefined reference to `sceGuDispBuffer'
graphics.c:(.text+0xeb8): undefined reference to `sceGuClear'
graphics.c:(.text+0xec4): undefined reference to `sceGuDepthBuffer'
graphics.c:(.text+0xed0): undefined reference to `sceGuOffset'
graphics.c:(.text+0xee4): undefined reference to `sceGuViewport'
graphics.c:(.text+0xef0): undefined reference to `sceGuDepthRange'
graphics.c:(.text+0xf04): undefined reference to `sceGuScissor'
graphics.c:(.text+0xf0c): undefined reference to `sceGuEnable'
graphics.c:(.text+0xf1c): undefined reference to `sceGuAlphaFunc'
graphics.c:(.text+0xf24): undefined reference to `sceGuEnable'
graphics.c:(.text+0xf2c): undefined reference to `sceGuDepthFunc'
graphics.c:(.text+0xf34): undefined reference to `sceGuEnable'
graphics.c:(.text+0xf3c): undefined reference to `sceGuFrontFace'
graphics.c:(.text+0xf44): undefined reference to `sceGuShadeModel'
graphics.c:(.text+0xf4c): undefined reference to `sceGuEnable'
graphics.c:(.text+0xf54): undefined reference to `sceGuEnable'
graphics.c:(.text+0xf5c): undefined reference to `sceGuEnable'
graphics.c:(.text+0xf70): undefined reference to `sceGuTexMode'
graphics.c:(.text+0xf7c): undefined reference to `sceGuTexFunc'
graphics.c:(.text+0xf88): undefined reference to `sceGuTexFilter'
graphics.c:(.text+0xf90): undefined reference to `sceGuAmbientColor'
graphics.c:(.text+0xf98): undefined reference to `sceGuEnable'
graphics.c:(.text+0xfb0): undefined reference to `sceGuBlendFunc'
graphics.c:(.text+0xfb8): undefined reference to `sceGuFinish'
graphics.c:(.text+0xfc4): undefined reference to `sceGuSync'
graphics.c:(.text+0xfd4): undefined reference to `sceGuDisplay'
graphics.o: In function `clearScreen':
graphics.c:(.text+0x101c): undefined reference to `sceGuClearDepth'
graphics.c:(.text+0x1024): undefined reference to `sceGuClear'
graphics.c:(.text+0x102c): undefined reference to `sceGuFinish'
graphics.c:(.text+0x1040): undefined reference to `sceGuSync'
graphics.o: In function `blitAlphaImageToScreen':
graphics.c:(.text+0x10ec): undefined reference to `sceGuTexImage'
graphics.c:(.text+0x1110): undefined reference to `sceGuTexScale'
graphics.c:(.text+0x1120): undefined reference to `sceGuFinish'
graphics.c:(.text+0x1158): undefined reference to `sceGuSync'
graphics.c:(.text+0x118c): undefined reference to `sceGuGetMemory'
graphics.c:(.text+0x120c): undefined reference to `sceGuDrawArray'
graphics.c:(.text+0x1220): undefined reference to `sceGuFinish'
graphics.c:(.text+0x1258): undefined reference to `sceGuSync'
graphics.o: In function `blitImageToScreen':
graphics.c:(.text+0x1320): undefined reference to `sceGuCopyImage'
graphics.c:(.text+0x1328): undefined reference to `sceGuFinish'
graphics.c:(.text+0x135c): undefined reference to `sceGuSync'
collect2: ld returned 1 exit status
make: *** [mymodule.elf] Error 1

ok now i get a sh*t load of errors

[PSPJunkie_]

did u include the correct libs (including zlib)

[SG57]

You need to add

-lpspgl -lpng

To your makefile's LIBS line. There is no reference there to a function in zlib PSPJunkie_.

You may also have to add -lpspgum, but Im not seeing any references to it, so itd be unnecesary.

[Insert_Witty_Name]

Your LIBS line in the makefile should look like this:

LIBS = -lpspgu -lpng -lz -lm

You also need to have libpng and zlib installed if you haven't already.

[1337PSPer]

ok thx guys at least now it will compile
ok can anyone see where i have made a stupid mistake(it is a prx btw)

#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspkernel.h>
#include <pspdebug.h>
#include <pspgu.h>
#include <png.h>
#include <stdio.h>
#include "graphics.h"

#define printf pspDebugScreenPrintf
#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))

PSP_MODULE_INFO("SHUTDOWN", 0, 1, 1);



int main() {

SceCtrlData pad;

	Image* splash;
          pspDebugScreenInit();
          initGraphics();
	splash = loadImage("spalsh.png");
	                    sceDisplayWaitVblankStart();
		
	
blitAlphaImageToScreen(0, 0, 480, 272, splash, 0, 0);


flipScreen();	

	sceKernelSleepThread();
	return 0;


}

[hallo007]

wich errors?

[RogueX]

loadImage("spalsh.png");

I'm guessing you mean to load splash.png instead.

[hallo007]

lol , some questions
is it possible to let led's change of color , they are placed in the r and l button

i know this will be very difficult

any idea's?

[PSPduh]

lol , some questions
is it possible to let led's change of color , they are placed in the r and l button

i know this will be very difficult

any idea's?

What do you mean?

You mean if you have LED's in the L and R button is it possible for them to change color with homebrew? If so, then I do think that is impossible. :S