Now that I have screamed for help, here is my problem
I have finally got a 16-bit engine (well, just plotting some pixels) and I *thought* I had page-flipping (using DirectX Flip) but now I am running into the same problem I had before.
It seems that my primary buffer disappears after about 10 seconds of page flipping???
I have a command called bpixel16:
void bpixel16(int x, int y, char r, char g, char b){
back_buffer[x + (y*ddsd.lPitch >> 1)]=_RGB(r,g,b);
}
This command simply draws a colored dot onto the backbuffer. I *never* write to the primary. And the command works great. I check for 555 and 565. Once again, the pixel is great.
Below I have posted my main loop (just a small test). What it does is draw a bunch of red pixels, flip the surfaces, then draw a bunch of green pixels.
Now, I have two surfaces (primary and secondary) one red and one green.
The rest of the program simply flips the two surfaces ever so often until the ESC is pressed.
Everything works great for about 10 seconds and then the *GREEN* surface disappears!! Turns to black!
Now, I have a red and black surface flipping.
What''s going on? Is the primary being erased or something?
Below is my main loop and the source for the flip();
If this is not enough code to debug then I will gladly post the rest or even the whole thing (nothing to hide)
Thanks for your help....
********************************************************
int Game_Main(void *parms){
lockbackbuffer();
for(unsigned int count=0;count<1000000;count++){
bpixel16(rand()%SCREEN_WIDTH, rand()%SCREEN_HEIGHT, 31,0,0);
}
unlockbackbuffer();
flip();
lockbackbuffer();
for(count=0;count<1000000;count++){
bpixel16(rand()%SCREEN_WIDTH, rand()%SCREEN_HEIGHT, 0,63,0);
}
unlockbackbuffer();
while(!(KEY_DOWN(VK_ESCAPE)))
{
Sleep(500);
flip();
}
SendMessage(main_window_handle, WM_DESTROY,0,0);
return(1);
} // end Game_Main
**************** FLIP
void flip(void){
while(lpddsprimary->Flip(NULL, DDFLIP_WAIT)!=DD_OK);
}
**********************************
This might help out too:
//------------------------------------------------------------
// CREATE PRIMARY AND SECONDARY SURFACE
//------------------------------------------------------------
// Create the primary surface
memset(&ddsd,0,sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS / DDSD_BACKBUFFERCOUNT;
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE / DDSCAPS_FLIP / DDSCAPS_COMPLEX;
ddsd.dwBackBufferCount = 1;
if (lpdd->CreateSurface(&ddsd,&lpddsprimary,NULL)!=DD_OK){
log("\n**** ERROR ****\nCOULD NOT CREATE PRIMARY SURFACE\n");
MessageBox(main_window_handle, "ERROR - PRIMARY BUFFER", "", MB_OK);
return(0);
}
else
{
log("\n-Created Primary Surface...");
}
// Get the pointer to the back buffer
ddscaps.dwCaps = DDSCAPS_BACKBUFFER;
if(lpddsprimary->GetAttachedSurface(&ddscaps, &lpddsback)!=DD_OK){
log("\n**** ERROR ****\nCOULD NOT CREATE BACK SURFACE\n");
MessageBox(main_window_handle, "ERROR - BACK BUFFER", "", MB_OK);
lpdd->Release();
return(false);
}
else
{
log("\n-Created Secondary Surface (backbuffer)...");
}
//------------------------------------------------------------
// GET PIXEL FORMAT AND SETUP GBITS (8,15,16,24,32 bits)
//------------------------------------------------------------
DDPIXELFORMAT ddpf;
ZeroMemory (&ddpf,sizeof(ddpf));
ddpf.dwSize = sizeof(ddpf);
lpddsprimary->GetPixelFormat (&ddpf);
color_depth = ddpf.dwRGBBitCount; //INIT GBITS (for 555,565,etc...)
if(color_depth=16){
GBITS=6; //565
}
else
{
GBITS=5; //555
}
****************************
Sorry for such a long post but this is REALLY starting to bother me!
Thanks again!
-zebes
zebes@mindspring.com
