Graphic::~Graphic()
{
#ifdef SVGALIB
vga_getch();
vga_setmode(TEXT);
#endif
}
/*
* Check for "events"
* If block, then busy-loop waiting for event, else check once and exit.
*/
static errr CheckEvents(int block)
{
int k = 0;
if (block)
{
k = vga_getkey();
if (k < 1) return (1);
}
else
{
k = vga_getch();
}
Term_keypress(k);
return (0);
}
void main(void)
{
struct timeval timeout;
fd_set inputs;
char bitmap[16 * 16 * 4]; /* big enough for 10x10 bitmap in any mode */
int vgamode, color, pipefd[2], x, y, button, event, cursorsize = 5;
char loop = 1, drawcursor = 1;
#ifdef USE_RAWKEYBOARD
char space_pressed = 0;
#endif
puts("This is a demo showing the abilities of the new vga_waitevent() function\n"
"If something goes wrong it might hang your machine. Thus hit <ctrl>-C now\n"
"to bailout if in doubt.\n"
"Use mouse to move cursor. 1-9,0 to set the cursor size. Space to change the\n"
"cursor color. Left button to draw. Right button or 'Q' to bailout.\n"
"The cursor goes on/off every half second by usage of a timeout passed to\n"
"vga_waitevent. Every 5 secs a string from a child process (the time) arrives\n"
"asynchronously and is displayed by the frontend.");
#ifdef USE_RAWKEYBOARD
puts("\nBEWARE! This has been compiled to use the raw keyboard. A crash might\n"
"render the console unusable. (but shouldn't).");
#endif
fputs("\nHit <Enter> if brave enough, else ^C to bailout: ", stdout);
fflush(stdout);
getchar();
fflush(stdin); /* clear I/O buffer */
pipe(pipefd);
if (fork() == 0) { /* fork off b4 touching graphix to avoid side effects */
close(pipefd[0]); /* Important: close reading side, else it remains */
/* opened by child when parent exits and we don't get */
/* a SIGPIPE! */
child(pipefd[1]);
}
vga_init();
vgamode = vga_getdefaultmode();
if (vgamode == -1)
vgamode = G320x200x256;
if (!vga_hasmode(vgamode)) {
printf("Mode not available.\n");
exit(-1);
}
/* Enable automatic mouse setup at mode set. */
vga_setmousesupport(1);
vga_setmode(vgamode);
/* Disable wrapping (default). */
/* mouse_setwrap(MOUSE_NOWRAP); */
gl_setcontextvga(vgamode);
gl_enableclipping();
/* There might be some scrap data in the serial buffer
from the mouse. It will make vga_waitevent block
because it thinks the mouse wants to send data but
then no mouse packet arrives. */
color = newcolor();
x = 0;
y = 0;
gl_setwritemode(WRITEMODE_OVERWRITE | FONT_COMPRESSED);
gl_setfont(8, 8, gl_font8x8);
gl_setfontcolors(0, newcolor());
#ifdef USE_RAWKEYBOARD
if (keyboard_init()) {
printf("Could not initialize keyboard.\n");
exit(1);
}
#endif
while (loop) {
gl_getbox(x, y, 10, 10, bitmap);
if (drawcursor) {
gl_hline(x, y, x + cursorsize, color);
gl_hline(x, y + cursorsize, x + cursorsize, color);
gl_line(x, y, x, y + cursorsize, color);
gl_line(x + cursorsize, y, x + cursorsize, y + cursorsize, color);
}
FD_ZERO(&inputs);
FD_SET(pipefd[0], &inputs);
timeout.tv_sec = 0;
timeout.tv_usec = 500000; /* 0.5 second time out */
event = vga_waitevent(VGA_MOUSEEVENT | VGA_KEYEVENT,
&inputs, NULL, NULL, &timeout);
gl_putbox(x, y, 10, 10, bitmap);
if (timeout.tv_sec || timeout.tv_usec) {
/* No timeout. An actual event occured. Reset to visible
cursor. Note:
This is actually a bug as the cursor will get visible on time
updates. However, it's better this way for demo/test
purposes. */
drawcursor = 1;
} else {
drawcursor ^= 1;
}
if (FD_ISSET(pipefd[0], &inputs))
process_input(pipefd[0]);
if (event & VGA_MOUSEEVENT) {
x = mouse_getx();
y = mouse_gety();
button = mouse_getbutton();
if (button & MOUSE_LEFTBUTTON)
gl_fillbox(x, y, cursorsize + 1, cursorsize + 1, color);
if (button & MOUSE_RIGHTBUTTON)
loop = 0;
}
if (event & VGA_KEYEVENT) {
#ifdef USE_RAWKEYBOARD
if (keyboard_keypressed(SCANCODE_1))
cursorsize = 0;
if (keyboard_keypressed(SCANCODE_2))
cursorsize = 1;
if (keyboard_keypressed(SCANCODE_3))
cursorsize = 2;
if (keyboard_keypressed(SCANCODE_4))
cursorsize = 3;
if (keyboard_keypressed(SCANCODE_5))
cursorsize = 4;
if (keyboard_keypressed(SCANCODE_6))
cursorsize = 5;
if (keyboard_keypressed(SCANCODE_7))
cursorsize = 6;
if (keyboard_keypressed(SCANCODE_8))
cursorsize = 7;
if (keyboard_keypressed(SCANCODE_9))
cursorsize = 8;
if (keyboard_keypressed(SCANCODE_0))
cursorsize = 9;
if (keyboard_keypressed(SCANCODE_Q))
loop = 0;
if (keyboard_keypressed(SCANCODE_SPACE)) {
if (!space_pressed) {
color = newcolor();
space_pressed = 1;
}
} else {
space_pressed = 0;
}
#else
switch (vga_getch()) {
case '1':
cursorsize = 0;
break;
case '2':
cursorsize = 1;
break;
case '3':
cursorsize = 2;
break;
case '4':
cursorsize = 3;
break;
case '5':
cursorsize = 4;
break;
case '6':
cursorsize = 5;
break;
case '7':
cursorsize = 6;
break;
case '8':
cursorsize = 7;
break;
case '9':
cursorsize = 8;
break;
case '0':
cursorsize = 9;
break;
case ' ':
color = newcolor();
break;
case 'q':
case 'Q':
loop = 0;
break;
default:
ping();
break;
}
#endif
}
}
#ifdef USE_RAWKEYBOARD
keyboard_close(); /* Don't forget this! */
#endif
vga_setmode(TEXT);
exit(0);
}
int main() {
int maxCols = 1024;
int maxRows = 768;
int maxIterations = 2048;
int maxSize = 4;
float Xmin = -2.0;
float Xmax = 1.2;
float Ymin = -1.2;
float Ymax = 1.2;
double X, Y;
double Xsquare, Ysquare;
double currentP;
double currentQ[767];
double deltaP, deltaQ;
int color;
int currentRow, currentCol;
deltaP = (Xmax - Xmin)/(double)maxCols;
deltaQ = (Ymax - Ymin)/(double)maxRows;
currentQ[0] = Ymax;
for (currentRow = 1; currentRow < maxRows; currentRow++) {
currentQ[currentRow] = currentQ[currentRow-1] - deltaQ;
}
currentP = Xmin;
vga_init();
vga_setmode(G1024x768x256);
gl_setcontextvga(G1024x768x256);
physicalscreen = gl_allocatecontext();
gl_getcontext(physicalscreen);
gl_setcontextvgavirtual(G1024x768x256);
virtualscreen = gl_allocatecontext();
gl_getcontext(virtualscreen);
gl_setcontext(virtualscreen);
for (currentCol = 0; currentCol < maxCols; currentCol++) {
for (currentRow = 0; currentRow < maxRows; currentRow++) {
X = 0.0;
Y = 0.0;
Xsquare = 0.0;
Ysquare = 0.0;
color = 0;
while ((color <= maxIterations) && (Xsquare + Ysquare <= maxSize)) {
Xsquare = X * X;
Ysquare = Y * Y;
Y = (2*X*Y) + currentQ[currentRow];
X = (Xsquare - Ysquare) + currentP;
color++;
}
gl_setpixel(currentCol, currentRow, color % 256);
}
currentP = currentP + deltaP;
gl_copyscreen(physicalscreen);
}
vga_getch();
gl_clearscreen(0);
vga_setmode(TEXT);
return 0;
}
