Quote:Original post by AdamGL
You can have graphics in dos, but you'll need to access the video buffer manually. I don't now how so search it and you'll find something.
unsigned char *screen = 0xA0000000;Quote:Original post by Boder
Be careful though, there is no platform independent way in the standard library to clear the screen.
Windows: system("cls")
Nix: system("clear")
Quote:Original post by Cosmic R
I remember learning in the early days of dos game programming it was mandatory that you knew how to access the video buffer, as you usually had to write all your own graphics code. IIRC it was something load loading the AX register with 0x0013 and then calling int 21. thats why VGA 320x200 used to be called mode 13.
to access the video memory(for mode 13 anyway) you just wrote directly to 0xA0000000.
I used to create a global pointer called screen and point it to the memory location ie:unsigned char *screen = 0xA0000000;
Quote:
Original post by Cosmic R
I remember learning in the early days of dos game programming it was mandatory that you knew how to access the video buffer, as you usually had to write all your own graphics code. IIRC it was something load loading the AX register with 0x0013 and then calling int 21. thats why VGA 320x200 used to be called mode 13.
Quote:10h is the video bios iterrupts, while 21h is the dos bios iterrupts.
unsigned char far *screen = (unsigned char far *)0xA0000000L;void setVideoMode(int MODE){ _asm { mov ax, MODE int 10h }}void putPixel(int X, int Y, unsigned char COLOR){ *(screen + (Y<<6) + (Y<<8) + X) = COLOR;}int main() // args...{ setVideoMode(19); putPixel(160, 100, 15); setVideoMode(3); return 0;}Quote:Original post by Cosmic R
I actually learnt all this from 2 sources - denthors asm tutorials(they were the bible back in the day...) and Andre LaMothe's Teach yourself game programming in 21 days - the best game programming book I ever read.
