stew

a monorepo of some sort
git clone git://git.nsmpr.xyz/stew.git
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cube.c (2092B)

      1 /*
      2  * cube.c: a cube, rotating
      3  */
      4 
      5 #include <u.h>
      6 #include <libc.h>
      7 #include <draw.h>
      8 #include <geometry.h>
      9 #include <thread.h>
     10 #include <mouse.h>
     11 #include <cursor.h>
     12 #include <keyboard.h>
     13 
     14 Image *red;
     15 Space *s[4];
     16 double theta;
     17 
     18 
     19 
     20 Point3 cube[8] = {
     21 	{-1, -1, -1, 1}, {-1, -1,  1, 1},
     22 	{-1,  1, -1, 1}, {-1,  1,  1, 1},
     23 	{ 1, -1, -1, 1}, { 1, -1,  1, 1},
     24 	{ 1,  1, -1, 1}, { 1,  1,  1, 1},
     25 };
     26 
     27 int lines[12][2] = {
     28 	{0, 1}, {1, 3}, {3, 2}, // 0 1 3 2
     29 	{1, 5}, {5, 7}, {7, 3}, // 1 5 7 3
     30 	{5, 4}, {4, 6}, {6, 7}, // 5 4 6 7
     31 	{4, 0}, {0, 2}, {2, 6}, // 4 0 2 6
     32 };
     33 
     34 void
     35 mkmat(void)
     36 {
     37 	s[0] = pushmat(nil);
     38 	s[1] = pushmat(s[0]);
     39 	s[2] = pushmat(s[1]);
     40 	s[3] = pushmat(s[2]);
     41 	rot(s[0], theta, 2);
     42 	look(s[1],
     43 		(Point3){5, 4, 3, 1},
     44 		(Point3){0, 0, 0, 1},
     45 		(Point3){0,0,1,1});
     46 	persp(s[2], 30, 10, 25);
     47 	viewport(s[3], screen->r, 1);
     48 }
     49 
     50 Point3
     51 tf(Point3 in, Space *s)
     52 {
     53 	if (s == nil) return in;
     54 	return xformpointd(tf(in, s->next), nil, s);
     55 }
     56 
     57 void
     58 drawscene(void)
     59 {
     60 	int i;
     61 	Point3 s3, e3;
     62 	for (i = 0; i < 12; i++) {
     63 		s3 = tf(cube[lines[i][0]], s[3]);
     64 		e3 = tf(cube[lines[i][1]], s[3]);
     65 		line(screen, Pt(s3.x, s3.y), Pt(e3.x, e3.y), 0, 0, 1, red, ZP);
     66 	}
     67 }
     68 
     69 void
     70 threadtimer(void *)
     71 {
     72 	for(;;) {
     73 		sleep(1000 / 60);
     74 		theta += 2.5;
     75 		if (theta >= 90) theta -= 90;
     76 		ident(s[0]->t);
     77 		rot(s[0], theta, 2);
     78 		draw(screen, screen->r, display->black, nil, ZP);
     79 		drawscene();
     80 		flushimage(display, 1);
     81 	}
     82 }
     83 
     84 void
     85 threadmain(int, char **)
     86 {
     87 	Mouse mv;
     88 	Rune  kv;
     89 	int   rv[2];
     90 
     91 	initdraw(nil, nil, "cubes");
     92 	Mousectl *mc = initmouse(nil, screen);
     93 	Keyboardctl *kc = initkeyboard(nil);
     94 
     95 	red = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DRed);
     96 
     97 	mkmat();
     98 
     99 	proccreate(threadtimer, nil, 64 * 1024);
    100 
    101 	Alt alts[5] = {
    102 		{kc->c, &kv, CHANRCV},
    103 		{mc->c, &mv, CHANRCV},
    104 		{mc->resizec, rv, CHANRCV},
    105 		{0, 0, CHANEND},
    106 	};
    107 	for (;;) {
    108 		switch(alt(alts)){
    109 		case 0:
    110 			if (kv == 0x7f) threadexitsall(nil);
    111 			break;
    112 		case 1:
    113 			break;
    114 		case 2:
    115 			if(getwindow(display, Refnone) < 0)
    116 				sysfatal("resize failed: %r");
    117 			ident(s[3]->t);
    118 			viewport(s[3], screen->r, 1);
    119 			break;
    120 		}
    121 	}
    122 }