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From: George_Bain@Playstation.sony.com
Newsgroups: scee.yaroze.programming.2d_graphics
Subject: re:Hi-res question
Date: 17 May 1998 16:31:08 +0100
Organization: Sony Computer Entertainment Europe - 119.SS5
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From: George_Bain@Playstation.sony.com
To: news@playstation.co.uk
Content-Disposition: inline


Hi there,

Try clearing the VRAM...

 void ClearVRAM( void )
  {

       RECT rect_one, rect_two;

       // set rect
       rect_one.x = 0;
       rect_one.y = 0;
       rect_one.w = SCREEN_WIDTH;
       rect_one.h =  SCREEN_HEIGHT;

       // set rect
       rect_two.x = 0;
       rect_two.y = SCREEN_HEIGHT;
       rect_two.w = SCREEN_WIDTH;
       rect_two.h =  SCREEN_HEIGHT;

       // nuke top left of VRAM
       ClearImage(&rect_one, 0, 0, 0);

       // nuke bottom left of VRAM
       ClearImage(&rect_two, 0, 0, 0);

       DrawSync(0);  // wait for it to clear

 }// end ClearVRAM

If you want to nuke the whole contents of VRAM then use four rects
instead of just two...you'll get the idea.


Regards,


George@SCEE





From: James Chow <james@chowfam.demon.co.uk>

I've managed to up the resolution from 320*240 to 640*480
with relative ease.
But I would like to use 640*512 for the PAL display.

Using the method for changing 320*240 to 320*256 by
altering the GsDISPENV variable
GsDISPENV.disp.y = 20;
GsDISPENV.disp.h = 256;
gives the required 640*512 resolution.
But now the previous screen is not cleared before drawing
the current screen.

Can anyone help?
--
jc