vga-logic-processor-examples/main.c

#include <i86.h>
#include <conio.h>

extern void __cdecl enableUnchainedVGAMode();
extern void __cdecl enableTextMode();
extern void __cdecl fillScreen(int);
extern void __cdecl latchCopyCube();

char far *VGA = (char*)0xA0000;

#define PLANE_WIDTH (320 / 4)

void populateExampleCube(void) {
  int y, x;

  outp(0x3c4, 0x02);

  for (y = 0; y < 15; ++y) {
    for (x = 0; x < 15; ++x) {
      outp(0x3c5, 1 << (x % 4));
      VGA[y * PLANE_WIDTH + x / 4] = y * 16 + x;
    }
  }
}

int main(void) {
  // activate unchained vga mode
  // set up 8 very clear colors
  // place some data into video memory to be latch copied
  // show off the following
  // * latch copies
  // * masking
  // * barrel shifting

  int i,j;

  enableUnchainedVGAMode();

  fillScreen(0);

  populateExampleCube();
  latchCopyCube();

  delay(2000);

  /*

  outp(0x3c4, 0x02);

  for (i = 0; i < 200; ++i) {
    for (j = 0; j < 4; ++j) {
      outp(0x3c5, 1 << j);
      VGA[i] = j + 1;
    }
  }

  */

  //delay(3000);

  enableTextMode();
}