#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
/*#include <starbase.c.h>*/	/* ancient HP graphics API - good luck! */

#include "fixpoint.h"

void fill_color(int a, float b, float c, float d) {}
void intrectangle(int a, int b, int c, int d, int e) {}
void make_picture_current(int a) {}
void intvdc_extent(int a, int b, int c, int d, int e) {}
void clear_view_surface(int a) {}
void drawing_mode(int a, int b) {}
void mapping_mode(int a, bool b) {}

extern void printnbits();
extern void subpixel_triangle(fixpoint x0, fixpoint y0,
							  fixpoint x1, fixpoint y1,
							  fixpoint x2, fixpoint y2);
extern void triangle(int x0, int y0, int x1, int y1, int x2, int y2);


/*
  Exhaustively test all cases of (subpixel) triangle drawing.

  In fixpoint.h, Set HIBITS, LOBITS to small values (like 5, 2) to run this,
  or you'll wait forever and run out of memory.

  */

static int fildes;
struct color {float r, g, b;};
int verbose = 0;

#define SIZE 200
#define NPIXELS (1 << (HIBITS - 2))
#define BUFSIZE NPIXELS
int buffer[BUFSIZE][BUFSIZE];

void clear_buffer()
{
  register int i, j;
  for(i=0; i<BUFSIZE; i++)
	 for(j=0; j<BUFSIZE; j++)
		buffer[i][j] = 0;
}

/* Check if test succeeded (ie. buffer is full of ones,
	except for first line/column).
*/
void buffer_check()
{
  register int i, j;
  int broken = 0;

  for(i=1; i<BUFSIZE; i++)
	 for(j=1; j<BUFSIZE; j++)
		if (buffer[i][j] != 1) {
		  printf("ERROR: Buffer[%d][%d] = %d, not 1!!!\n",
					i, j, buffer[i][j]);
		  broken = 1;
		  break;
		}

  if (broken) {
	 for(j=1; j<BUFSIZE; j++) {
		for(i=1; i<BUFSIZE; i++) {
		  printf("%c", buffer[i][j] ? 'o' : '.' );
		}
		printf("\n");
	 }
  }
}


int xoff = 100;
int yoff = 100;

void
draw_point (int ix, int iy)
{

  if ((ix >= BUFSIZE) || (iy >= BUFSIZE)) {
	  printf("ERROR: ix (%d) or iy (%d) >= BUFSIZE (%d)\n", ix, iy, BUFSIZE);
	  abort();
	}

  if (buffer[ix][iy]){
	 printf("OOPS -- repainting pixel (%d, %d)\n", ix, iy);

	 fill_color(fildes, 1.0, 0.0, 0.5);
	 intrectangle(fildes, xoff + ix, yoff + iy, xoff + ix+1, yoff + iy+1);
	 fill_color(fildes, 1.0, 1.0, 1.0);

	 buffer[ix][iy] = 0;

	 make_picture_current(fildes);
	 abort();
  }
  else {
	 buffer[ix][iy] = 1;
	 intrectangle(fildes, xoff + ix, yoff + iy, xoff + ix+1, yoff + iy+1);
  }
}


int
InitScreen()
{
	char	*sb_dev, *driver;
	
	printnbits();

	sb_dev = getenv("SB_OUTDEV");   
	if(!sb_dev) sb_dev = getenv("OUTDEV");   
	if(!sb_dev) sb_dev = "/dev/crt1";

	driver = getenv("SB_OUTDRIVER");
	if(!driver) driver = getenv("OUTDRIVER");
	if (!driver ) driver = "hp98731";
	
	// ANCIENT fildes = gopen(sb_dev,OUTDEV,driver,INIT|INT_XFORM);
	// ANCIENT interior_style(fildes,INT_SOLID,FALSE);
	
	intvdc_extent(fildes,0,0,SIZE, SIZE);
	mapping_mode(fildes,false);
	
	drawing_mode(fildes,6);	  /* xor mode */
	
	// ANCIENT clear_control(fildes, CLEAR_VIEWPORT);
	fill_color(fildes, 1.0, 1.0, 1.0);
	
	return(fildes);
}


int
main()
{
  int i, j;
#pragma warning(disable : 4293)
  fixpoint zero, maxpix;

  zero = 0;
  maxpix = ((NPIXELS-1) << LOBITS) | LOMASK;

  InitScreen();

  if (verbose) {
	 printf("zero "); fp_print(zero); printf(", max "); fp_print(maxpix);
	 printf("\n");
  }

  for (i=0; i != maxpix + 1; i++) {
	 for (j=0; j != maxpix + 1; j++) {

		if (verbose) {
		  printf("\n\n************** New Iteration ************\n\n");
		  printf("%3d, %3d --> ", i, j);
		  fp_print(i); printf(", "); fp_print(j); printf("\n");
		}

		clear_buffer();
		clear_view_surface(fildes); 

		fill_color(fildes, 0.5, 0.5, 0.5);
		subpixel_triangle(zero, zero,  zero,  maxpix, i, j);

		fill_color(fildes, 0.0, 1.0, 0.0);
		subpixel_triangle(zero, zero,  maxpix,  zero, i, j);

		fill_color(fildes, 0.0, 0.0, 1.0);
		subpixel_triangle(zero,  maxpix,  maxpix,   maxpix, i, j);

		fill_color(fildes, 1.0, 0.0, 0.0);
		subpixel_triangle( maxpix, zero,  maxpix,   maxpix, i, j);

		buffer_check();
		make_picture_current(fildes);

		if (verbose) {
		  printf("  hit <return> for next iteration\n");
		  getchar();
		}

	 }
  }
}