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#include "2D.h"
#include <math.h>
void set_vgabasemem(void)
{
ULONG vgabase;
SELECTOR tmp;
asm mov [tmp], ds
dpmi_get_sel_base(&vgabase, tmp);
vgabasemem = (char *)(-vgabase + 0xa0000);
}
void drw_chdis(int mode) // change the display!
{
regs.b.ah = 0x00; // seet theh display moode
regs.b.al = mode; // change it to the mode like innit
regs.h.flags = 0x72;// Set the dingoes kidneys out of FLAGS eh?
regs.h.ss = 0; // Like, totally set the stack segment
regs.h.sp = 0; // Set tha stack pointaaaaahhhhh!!!
dpmi_simulate_real_interrupt(0x10, ®s);
}
void drw_pix(int x, int y, enum COLORS col)
{
*VGAPIX(x, y) = col;
}
void drw_line(int x0, int y0, int x1, int y1, enum COLORS col)
{
// Going for the optimized version of bresenham's line algo.
int stp = (abs(y0 - y1) > abs(x0 - x1));
int tmp, dx, dy, err, yi, i, j; // yi = y excrement
if (stp) {
// swappity swap
tmp = y0;
y0 = x0;
x0 = tmp;
tmp = y1;
y1 = x1;
x1 = tmp;
}
// AAAAND NOW WE MUST DO ZEES AGAIN :(
// I'm sure there was a func somewhere that does this? :P
if (x0 > x1) {
tmp = x0;
x0 = x1;
x1 = tmp;
tmp = y0;
y0 = y1;
y1 = tmp;
}
dx = (x1 - x0);
dy = (abs(y1 - y0));
err = (dx / 2);
if (y0 < y1)
yi = 1;
else
yi = -1;
j = y0;
for (i = x0; i < x1; i++)
{
if (stp)
*VGAPIX(j, i) = col;
else
*VGAPIX(i, j) = col;
err -= dy;
if (err < 0) {
j += yi;
err += dx;
}
}
}
void drw_rectl(int x, int y, int w, int h, enum COLORS col)
{
drw_line(x, y, x+w, y, col);
drw_line(x+w, y, x+w, y+h, col);
drw_line(x, y, x, y+h, col);
drw_line(x, y+h, x+w+1, y+h, col);
}
void drw_rectf(int x, int y, int w, int h, enum COLORS col)
{
int i, j;
for (j = y; j < x+h; j++) {
for (i = x; i < y+w; i++) {
*VGAPIX(i, j) = col;
}
}
}
void drw_circl(int x, int y, int rad, enum COLORS col)
{
int mang, i; // max angle, haha
int px, py;
mang = 360; // Yeah yeah I'll switch to rad later
for (i = 0; i <= mang; i++)
{
px = cos(i)*rad + x; // + px; // causes some really cools effects! :D
py = sin(i)*rad + y; // + py;
*VGAPIX(px, py) = col;
}
}
void drw_tex(int x, int y, int w, int h, enum COLORS tex[])
{ // i*w+j
int i, j;
for (i = 0; i < w; i++)
{
for (j = 0; j < h; j++)
{
*VGAPIX(x+i, y+j) = tex[j*w+i];
}
}
}
void 2D_init(void)
{
set_vgabasemem();
drw_chdis(0x13);
}
void 2D_exit(void)
{
drw_chdis(3);
}
/*
int main()
{
set_vgabasemem();
drw_chdis(0x13);
while(!kbhit()) {
if ((getch()) == 0x1b) // escape
break;
}
drw_chdis(3);
return 0;
}
*/