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Date: Mon, 6 Nov 2000 02:29:02 -0600
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From: "Richard A. Smith" <[EMAIL PROTECTED]>
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Subject: Direct access to paged Video ram
I am haveing some trouble trying to put an image into paged video RAM of a
640x480x256
display.
I need to have an image show up on the screen instantly or at least appear to be so.
So far all the various functions I have tried are either not fast enough or don't
seem to
work at all.
vga_drawscanline, and vga_drawpixel are too slow.
gl_copyscreen, and gl_putbox don't seem to fucnction proplerly on my hardware. (Both
a ATI
mach64 and a C&T 69030 with the VESA driver)
browsing through the gl_ source I came across code for direct access to the video
memory but
again I can't seem to get it to work.
Here's my test code:
vga_setpage(0);
vidmem = vga_getgraphmem();
offset = 0;
vidndx = vidbuf;
for (pagecounter = 0 ; pagecounter < 65536 ; pagecounter++) {
*(vidmem + offset) = *vidndx;
offset++;
vidndx++;
}
vidbuf is a pointer to wher my image is stored. I would have thought that this would
allow
me to fill the first 64k page with the top portion of my image as fast as possible.
But all
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