OmahaStylee
Joined: 29 Aug 2005
Posts: 14
Location: Los Angeles, CA
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 Posted: Tue Aug 30, 2005 10:47 am Post subject: Most efficient cursor method |
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I was wondering what the most effecient and effective way to make a moveable cursor would be. I did one with a simple plot image script that shine used in his snake game, but I cant seem to get it to work perfectly. Well, his script works perfectly, but my part doesnt. I can control the cursor, but i cant get it to look right. Either it trails and leaves markings all over the background, or i refresh the background before plotting its movement and it flickers.
If anyone has some sample code i could use, that'd be great. I want to do this the most effecient way possible for where we are at right now (the method might get outdated later). I think that might be using the GPU (GU?)
| Code: |
//Function For Printing An Image to the Screen
//Created by Yeldarb (with help from other code) on August 21, 2005
#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>
/* Define the module info section */
PSP_MODULE_INFO("xxxxxxx", 0, 1, 1);
/* Define the main thread's attribute value (optional) */
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER | THREAD_ATTR_VFPU);
//External Files (Images)
extern u32 image_start[];
extern u32 image1_start[];
u32* images[] = { image_start, image1_start };
//Color "Functions" (Conversion and Test)
#define RGB(r, g, b) ((r)|((g)<<8)|((b)<<16))
#define IS_ALPHA(value) (((value)&0xff000000)==0)
//constants
#define SCREEN_WIDTH 480
#define SCREEN_HEIGHT 272
#define PSP_PIXEL_FORMAT 3 // 32 bit RGBA
#define PSP_LINE_SIZE 512 // in u32
//480*272 = 60*38
#define CMAX_X 60
#define CMAX_Y 38
#define CMAX2_X 30
#define CMAX2_Y 19
#define CMAX4_X 15
#define CMAX4_Y 9
u32* pg_vramtop = (u32*)(0x04000000+0x40000000);
long pg_screenmode;
long pg_showframe;
long pg_drawframe;
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;
}
void pgWaitVn(unsigned long count) {
for (; count>0; --count) {
sceDisplayWaitVblankStart();
}
}
void pgWaitV() {
sceDisplayWaitVblankStart();
}
u32* pgGetVramAddr(unsigned long x,unsigned long y) {
return pg_vramtop+(y * PSP_LINE_SIZE)+x+(pg_drawframe?PSP_LINE_SIZE*SCREEN_HEIGHT:0);
}
void pgScreenFrame(long mode,long frame) {
pg_screenmode=mode;
frame=(frame?1:0);
pg_showframe=frame;
if (mode==0) {
//screen off
pg_drawframe=frame;
sceDisplaySetFrameBuf(0,0,0,1);
} else if (mode==1) {
//show/draw same
pg_drawframe=frame;
sceDisplaySetFrameBuf((char*)(pg_vramtop+(pg_drawframe?PSP_LINE_SIZE*SCREEN_HEIGHT:0)),PSP_LINE_SIZE,PSP_PIXEL_FORMAT,1);
} else if (mode==2) {
//show/draw different
pg_drawframe=(frame?0:1);
sceDisplaySetFrameBuf((char*)(pg_vramtop+(pg_drawframe?PSP_LINE_SIZE*SCREEN_HEIGHT:0)),PSP_LINE_SIZE,PSP_PIXEL_FORMAT,1);
}
}
void pgInit() {
sceDisplaySetMode(0,SCREEN_WIDTH,SCREEN_HEIGHT);
pgScreenFrame(0,0);
}
void pgScreenFlip() {
pg_showframe=(pg_showframe?0:1);
pg_drawframe=(pg_drawframe?0:1);
sceDisplaySetFrameBuf((char*)(pg_vramtop+(pg_showframe?PSP_LINE_SIZE*SCREEN_HEIGHT:0)),PSP_LINE_SIZE,PSP_PIXEL_FORMAT,0);
}
void pgScreenFlipV() {
pgWaitV();
pgScreenFlip();
}
void pgFlipDrawFrame() {
pg_drawframe=(pg_drawframe?0:1);
}
void pgFlipShowFrameV() {
pgWaitV();
pg_showframe=(pg_showframe?0:1);
sceDisplaySetFrameBuf((char*)(pg_vramtop+(pg_showframe?PSP_LINE_SIZE*SCREEN_HEIGHT:0)),PSP_LINE_SIZE,PSP_PIXEL_FORMAT,0);
}
void plotImage(int x, int y, u32* image, int sizeX, int sizeY) {
u32* vram = pgGetVramAddr(x, y);
int xo, yo;
for (yo = 0; yo < sizeY; yo++) {
for (xo = 0; xo < sizeX; xo++) {
if (!IS_ALPHA(*image)) {
vram[xo + yo * PSP_LINE_SIZE] = *image;
} else {
//Uncomment this Line if You Want a Background Image (And Don't Clear the Screen)
//vram[xo + yo * PSP_LINE_SIZE] = background_start[x + xo + (y + yo) * SCREEN_WIDTH];
}
image++;
}
}
}
int main() {
SetupCallbacks();
pgInit();
pgScreenFrame(1, 1);
int x=0;
int y=0;
int cursorWidth = 15;
int cursorHeight = 25
int speed = 5;
SceCtrlData pad;
int changed = 1;
while(1) {
sceDisplayWaitVblankStart();
sceCtrlReadBufferPositive(&pad, 1);
if (pad.Buttons & PSP_CTRL_LEFT) {
if(x-speed >= 0) {
x -= speed;
changed = 1;
}
}
if(pad.Buttons & PSP_CTRL_RIGHT) {
if(x+speed+50 <= 480) {
x += speed;
changed = 1;
}
}
if(pad.Buttons & PSP_CTRL_UP) {
if(y-speed >= 0) {
y -= speed;
changed = 1;
}
}
if(pad.Buttons & PSP_CTRL_DOWN) {
if(y+speed+50 <= 272) {
y += speed;
changed = 1;
}
}
if(changed) {
plotImage(0, 0, images[0], 480, 272);
plotImage(x, y, images[1], 15, 25);
changed = 0;
}
}
return 0;
}
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