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Shocking Speeds!

 
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Art



Joined: 09 Nov 2005
Posts: 647
PostPosted: Sat May 13, 2006 11:56 pm    Post subject: Shocking Speeds! Reply with quote
Shockingly Slow that is....
This is an attempt to make a template for programs that use graphics .
The Dpad moves the "ball" sprite around the screen, but it's way too slow,
and I haven't added any delay.
Everytime the ball moves I am placing a black image over the top of the last frame.
Any ideas how to speed it up?
Code:

//
#include <pspkernel.h>
#include <pspiofilemgr.h>
#include <pspctrl.h>
#include <pspdisplay.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#include <pspgu.h>
#include "graphics.h"
#include "mikmod.h"

#define true 1
#define false 0

/* Define the module info section */
PSP_MODULE_INFO("C2", 0x1000, 1, 1);

/* Define the main thread's attribute value (optional) */
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER | THREAD_ATTR_VFPU);

int ballx = 0;
int bally = 0;
int done = 0;

/* Exit callback */
int exit_callback(int arg1, int arg2, void *common)
{
   done = 1;
   return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp)
{
   int cbid;

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

   return 0;
}

/* Sets up the callback thread and returns its thread id */
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(void) {

   char blankscreen_buffer[200];
   Image* blankscreen;
   sprintf(blankscreen_buffer, "./C2/blankscreen.png");
   blankscreen = loadImage(blankscreen_buffer);

   char ball_buffer[200];
   Image* ball;
   sprintf(ball_buffer, "./C2/ball.png");
   ball = loadImage(ball_buffer);

   char blackball_buffer[200];
   Image* blackball;
   sprintf(blackball_buffer, "./C2/blackball.png");
   blackball = loadImage(blackball_buffer);

   initGraphics();
   SceCtrlData pad, lastpad;

   SetupCallbacks();

   sceCtrlSetSamplingCycle(0);
   sceCtrlSetSamplingMode(1);
 
                blitAlphaImageToScreen(0, 0, 480, 272, blankscreen, 0,0);
      flipScreen();

   sceCtrlReadBufferPositive(&lastpad, 1);
   do {

                blitAlphaImageToScreen(0, 0, 32, 32, ball, ballx, bally);
      sceDisplayWaitVblankStart();
      flipScreen();

      sceCtrlReadBufferPositive(&pad, 1);
      if(pad.Buttons != lastpad.Buttons) {
           lastpad = pad;
      }
            
      if(pad.Buttons & PSP_CTRL_UP) {
blitAlphaImageToScreen(0, 0, 32, 32, blackball, ballx, bally);
bally = bally - 1;
if (bally == -1) {
bally = 272;
}
      }
      
          if(pad.Buttons & PSP_CTRL_DOWN) {
blitAlphaImageToScreen(0, 0, 32, 32, blackball, ballx, bally);
bally = bally + 1;
if (bally == 273) {
bally = 0;
}
      }
         
      if(pad.Buttons & PSP_CTRL_LEFT) {
blitAlphaImageToScreen(0, 0, 32, 32, blackball, ballx, bally);
ballx = ballx - 1;
if (ballx == -1) {
ballx = 480;
}
      }
      
          if(pad.Buttons & PSP_CTRL_RIGHT) {
blitAlphaImageToScreen(0, 0, 32, 32, blackball, ballx, bally);
ballx = ballx + 1;
if (ballx == 481) {
ballx = 0;
}
      }
      sceDisplayWaitVblankStart();
      
   } while(!((pad.Buttons & PSP_CTRL_START) || done));

   sceKernelExitGame();
   return 0;
}
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Brunni



Joined: 08 Oct 2005
Posts: 186
PostPosted: Sun May 14, 2006 5:13 am    Post subject: Reply with quote
You are waiting VBlank twice, so it won't run faster than 30 fps.
Anyways alpha blending in software rendering is extremely slow, you should really avoid it or use an hardware-accelerated library instead (see my signature if you're interested).
_________________
Sorry for my bad english
Oldschool library for PSP - PC version released
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PeterM



Joined: 31 Dec 2005
Posts: 125
Location: Edinburgh, UK
PostPosted: Sun May 14, 2006 5:57 am    Post subject: Reply with quote
Also try sceCtrlPeekBufferPositive instead of sceCtrlReadBufferPositive.

(Note, I'm not at my own PC right now, so hopefully those function names are correct).
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Art



Joined: 09 Nov 2005
Posts: 647
PostPosted: Sun May 14, 2006 6:22 am    Post subject: Reply with quote
Ok, thanx.
I expected it to go very fast like a bullet if I added no delay.

I will try both of those suggestions.
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