ref: a435467f81a1d9d429109f3a34988c642bed6035
dir: /main.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <mouse.h>
#include <keyboard.h>
#include "geometry.h"
#include "graphics.h"
#include "obj.h"
#include "dat.h"
#include "fns.h"
Rune keys[Ke] = {
[K↑] = Kup,
[K↓] = Kdown,
[K←] = Kleft,
[K→] = Kright,
[Krise] = Kpgup,
[Kfall] = Kpgdown,
[KR↑] = 'w',
[KR↓] = 's',
[KR←] = 'a',
[KR→] = 'd',
[KR↺] = 'q',
[KR↻] = 'e',
[Kcam0] = KF|1,
[Kcam1] = KF|2,
[Kcam2] = KF|3,
[Kcam3] = KF|4,
[Kscrshot] = KF|12
};
char stats[Se][256];
Mousectl *mctl;
Channel *drawc;
int kdown;
vlong t0, t;
double Δt;
Mesh model;
char *mdlpath = "../threedee/mdl/rocket.obj";
Camera cams[4], *maincam;
#pragma varargck type "v" Point2
int
vfmt(Fmt *f)
{
Point2 p;
p = va_arg(f->args, Point2);
return fmtprint(f, "[%g %g %g]", p.x, p.y, p.w);
}
#pragma varargck type "V" Point3
int
Vfmt(Fmt *f)
{
Point3 p;
p = va_arg(f->args, Point3);
return fmtprint(f, "[%g %g %g %g]", p.x, p.y, p.z, p.w);
}
void *
emalloc(ulong n)
{
void *p;
p = malloc(n);
if(p == nil)
sysfatal("malloc: %r");
setmalloctag(p, getcallerpc(&n));
return p;
}
void *
erealloc(void *p, ulong n)
{
void *np;
np = realloc(p, n);
if(np == nil)
sysfatal("realloc: %r");
setrealloctag(np, getcallerpc(&p));
return np;
}
int
depthcmp(void *a, void *b)
{
Triangle3 *ta, *tb;
double za, zb;
ta = (Triangle3 *)a;
tb = (Triangle3 *)b;
za = (ta->p0.z + ta->p1.z + ta->p2.z)/3;
zb = (tb->p0.z + tb->p1.z + tb->p2.z)/3;
return zb-za;
}
void
drawaxis(void)
{
Point3 op = (Point3){0, 0, 0, 1},
px = (Point3){1, 0, 0, 1},
py = (Point3){0, 1, 0, 1},
pz = (Point3){0, 0, 1, 1};
line3(maincam, op, px, 0, Endarrow, display->black);
string3(maincam, px, display->black, font, "x");
line3(maincam, op, py, 0, Endarrow, display->black);
string3(maincam, py, display->black, font, "y");
line3(maincam, op, pz, 0, Endarrow, display->black);
string3(maincam, pz, display->black, font, "z");
}
void
drawstats(void)
{
int i;
snprint(stats[Scamno], sizeof(stats[Scamno]), "CAM %lld", maincam-cams+1);
snprint(stats[Sfov], sizeof(stats[Sfov]), "FOV %g°", maincam->fov);
snprint(stats[Scampos], sizeof(stats[Scampos]), "%V", maincam->p);
snprint(stats[Scambx], sizeof(stats[Scambx]), "bx %V", maincam->bx);
snprint(stats[Scamby], sizeof(stats[Scamby]), "by %V", maincam->by);
snprint(stats[Scambz], sizeof(stats[Scambz]), "bz %V", maincam->bz);
for(i = 0; i < Se; i++)
stringn(maincam->viewport, addpt(screen->r.min, Pt(10, 10 + i*font->height)), display->black, ZP, font, stats[i], sizeof(stats[i]));
}
void
redraw(void)
{
Triangle3 tmp;
static TTriangle3 *vistris;
static int nallocvistri;
Triangle trit;
Point3 n;
u8int c;
int i, nvistri;
nvistri = 0;
if(nallocvistri == 0 && vistris == nil){
nallocvistri = model.ntri/2;
vistris = emalloc(nallocvistri*sizeof(TTriangle3));
}
for(i = 0; i < model.ntri; i++){
/* world to camera */
tmp.p0 = WORLD2VCS(maincam, model.tris[i].p0);
tmp.p1 = WORLD2VCS(maincam, model.tris[i].p1);
tmp.p2 = WORLD2VCS(maincam, model.tris[i].p2);
/* back-face culling */
n = normvec3(crossvec3(subpt3(tmp.p1, tmp.p0), subpt3(tmp.p2, tmp.p0)));
if(dotvec3(n, mulpt3(tmp.p0, -1)) <= 0)
continue;
/* camera to projected ndc */
tmp.p0 = VCS2NDC(maincam, tmp.p0);
tmp.p1 = VCS2NDC(maincam, tmp.p1);
tmp.p2 = VCS2NDC(maincam, tmp.p2);
/* clipping */
/*
* no clipping for now, the whole triangle is ignored
* if any of its vertices gets outside the fustrum.
*/
if(isclipping(tmp.p0) || isclipping(tmp.p1) || isclipping(tmp.p2))
continue;
if(nvistri >= nallocvistri){
nallocvistri += model.ntri/3;
vistris = erealloc(vistris, nallocvistri*sizeof(TTriangle3));
}
vistris[nvistri] = (TTriangle3)tmp;
c = 0xff*fabs(dotvec3(n, Vec3(0, 0, 1)));
vistris[nvistri].tx = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, c<<24|c<<16|c<<8|0xff);
nvistri++;
}
qsort(vistris, nvistri, sizeof(TTriangle3), depthcmp);
lockdisplay(display);
draw(maincam->viewport, maincam->viewport->r, display->white, nil, ZP);
drawaxis();
for(i = 0; i < nvistri; i++){
/* ndc to screen */
trit.p0 = toviewport(maincam, vistris[i].p0);
trit.p1 = toviewport(maincam, vistris[i].p1);
trit.p2 = toviewport(maincam, vistris[i].p2);
filltriangle(maincam->viewport, trit, vistris[i].tx, ZP);
triangle(maincam->viewport, trit, 0, display->black, ZP);
freeimage(vistris[i].tx);
}
drawstats();
flushimage(display, 1);
unlockdisplay(display);
}
void
drawproc(void *)
{
threadsetname("drawproc");
for(;;){
send(drawc, nil);
sleep(FPS2MS(60));
}
}
void
screenshot(void)
{
int fd;
static char buf[128];
enter("Path", buf, sizeof buf, mctl, nil, nil);
if(buf[0] == 0)
return;
fd = create(buf, OWRITE, 0644);
if(fd < 0)
sysfatal("open: %r");
if(writeimage(fd, screen, 1) < 0)
sysfatal("writeimage: %r");
close(fd);
}
void
mouse(void)
{
if((mctl->buttons & 1) != 0)
fprint(2, "%v\n", fromviewport(maincam, mctl->xy));
if((mctl->buttons & 8) != 0){
maincam->fov -= 5;
if(maincam->fov < 1)
maincam->fov = 1;
reloadcamera(maincam);
}
if((mctl->buttons & 16) != 0){
maincam->fov += 5;
if(maincam->fov > 359)
maincam->fov = 359;
reloadcamera(maincam);
}
}
void
kbdproc(void *)
{
Rune r, *a;
char buf[128], *s;
int fd, n;
threadsetname("kbdproc");
if((fd = open("/dev/kbd", OREAD)) < 0)
sysfatal("kbdproc: %r");
memset(buf, 0, sizeof buf);
for(;;){
if(buf[0] != 0){
n = strlen(buf)+1;
memmove(buf, buf+n, sizeof(buf)-n);
}
if(buf[0] == 0){
if((n = read(fd, buf, sizeof(buf)-1)) <= 0)
break;
buf[n-1] = 0;
buf[n] = 0;
}
if(buf[0] == 'c'){
if(utfrune(buf, Kdel)){
close(fd);
threadexitsall(nil);
}
}
if(buf[0] != 'k' && buf[0] != 'K')
continue;
s = buf+1;
kdown = 0;
while(*s){
s += chartorune(&r, s);
for(a = keys; a < keys+Ke; a++)
if(r == *a){
kdown |= 1 << a-keys;
break;
}
}
}
}
void
handlekeys(void)
{
if(kdown & 1<<K↑)
placecamera(maincam, subpt3(maincam->p, maincam->bz), maincam->bz, maincam->by);
if(kdown & 1<<K↓)
placecamera(maincam, addpt3(maincam->p, maincam->bz), maincam->bz, maincam->by);
if(kdown & 1<<K←)
placecamera(maincam, subpt3(maincam->p, maincam->bx), maincam->bz, maincam->by);
if(kdown & 1<<K→)
placecamera(maincam, addpt3(maincam->p, maincam->bx), maincam->bz, maincam->by);
if(kdown & 1<<Krise)
placecamera(maincam, addpt3(maincam->p, maincam->by), maincam->bz, maincam->by);
if(kdown & 1<<Kfall)
placecamera(maincam, subpt3(maincam->p, maincam->by), maincam->bz, maincam->by);
if(kdown & 1<<KR↑)
aimcamera(maincam, qrotate(maincam->bz, maincam->bx, 5*DEG));
if(kdown & 1<<KR↓)
aimcamera(maincam, qrotate(maincam->bz, maincam->bx, -5*DEG));
if(kdown & 1<<KR←)
aimcamera(maincam, qrotate(maincam->bz, maincam->by, 5*DEG));
if(kdown & 1<<KR→)
aimcamera(maincam, qrotate(maincam->bz, maincam->by, -5*DEG));
if(kdown & 1<<KR↺)
placecamera(maincam, maincam->p, maincam->bz, qrotate(maincam->by, maincam->bz, 5*DEG));
if(kdown & 1<<KR↻)
placecamera(maincam, maincam->p, maincam->bz, qrotate(maincam->by, maincam->bz, -5*DEG));
if(kdown & 1<<Kcam0)
maincam = &cams[0];
if(kdown & 1<<Kcam1)
maincam = &cams[1];
if(kdown & 1<<Kcam2)
maincam = &cams[2];
if(kdown & 1<<Kcam3)
maincam = &cams[3];
if(kdown & 1<<Kscrshot)
screenshot();
}
void
resize(void)
{
lockdisplay(display);
if(getwindow(display, Refnone) < 0)
fprint(2, "can't reattach to window\n");
unlockdisplay(display);
maincam->viewport = screen;
reloadcamera(maincam);
}
void
usage(void)
{
fprint(2, "usage: %s [-l objmdl]\n", argv0);
exits("usage");
}
void
threadmain(int argc, char *argv[])
{
OBJ *objmesh;
fmtinstall('V', Vfmt);
fmtinstall('v', vfmt);
ARGBEGIN{
default: usage();
case 'l':
mdlpath = EARGF(usage());
break;
}ARGEND;
if(argc != 0)
usage();
if(initdraw(nil, nil, "3d") < 0)
sysfatal("initdraw: %r");
if((mctl = initmouse(nil, screen)) == nil)
sysfatal("initmouse: %r");
placecamera(&cams[0], Pt3(2, 0, -4, 1), Pt3(0, 0, 0, 1), Vec3(0, 1, 0));
configcamera(&cams[0], screen, 90, 0.1, 100, Ppersp);
placecamera(&cams[1], Pt3(-2, 0, -4, 1), Pt3(0, 0, 0, 1), Vec3(0, 1, 0));
configcamera(&cams[1], screen, 120, 0.1, 100, Ppersp);
placecamera(&cams[2], Pt3(-2, 0, 4, 1), Pt3(0, 0, 0, 1), Vec3(0, 1, 0));
configcamera(&cams[2], screen, 90, 0.1, 100, Ppersp);
placecamera(&cams[3], Pt3(2, 0, 4, 1), Pt3(0, 0, 0, 1), Vec3(0, 1, 0));
configcamera(&cams[3], screen, 120, 0.1, 100, Ppersp);
maincam = &cams[0];
if((objmesh = objparse(mdlpath)) == nil)
sysfatal("objparse: %r");
drawc = chancreate(1, 0);
display->locking = 1;
unlockdisplay(display);
proccreate(drawproc, nil, mainstacksize);
proccreate(kbdproc, nil, mainstacksize);
t0 = nsec();
for(;;){
enum {MOUSE, RESIZE, DRAW};
Alt a[] = {
{mctl->c, &mctl->Mouse, CHANRCV},
{mctl->resizec, nil, CHANRCV},
{drawc, nil, CHANRCV},
{nil, nil, CHANNOBLK}
};
switch(alt(a)){
case MOUSE: mouse(); break;
case RESIZE: resize(); break;
case DRAW: redraw(); break;
}
t = nsec();
Δt = (t-t0)/1e9;
handlekeys();
t0 = t;
sleep(16);
}
}