shithub: tinyrend

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show the rendering as it happens, with the option of visualizing the z-buffer.

--- a/main.c

+++ b/main.c

@@ -9,6 +9,8 @@

 #include <geometry.h>

 #include "libobj/obj.h"

+#define HZ2MS(hz)	(1000/(hz))

+

 typedef Point Triangle[3];

 typedef struct Sparams Sparams;

 typedef struct SUparams SUparams;

@@ -31,7 +33,7 @@

 };

-Memimage *fb;

+Memimage *fb, *zfb, *curfb;

 double *zbuf;

 Memimage *red, *green, *blue;

 OBJ *model;

@@ -38,6 +40,7 @@

 Memimage *modeltex;

 Channel *drawc;

 int nprocs;

+int rendering;

 char winspec[32];

@@ -461,10 +464,8 @@

 				bbox = Rect(

 					min(min(st.p0.x, st.p1.x), st.p2.x), min(min(st.p0.y, st.p1.y), st.p2.y),

-					max(max(st.p0.x, st.p1.x), st.p2.x), max(max(st.p0.y, st.p1.y), st.p2.y)

+					max(max(st.p0.x, st.p1.x), st.p2.x)+1, max(max(st.p0.y, st.p1.y), st.p2.y)+1

 				);

-				bbox.max.x++;

-				bbox.max.y++;

 				if(!ptinrect(sp->p, bbox))

 					continue;

@@ -473,11 +474,17 @@

 					continue;

 				z = t.p0.z*bc.x + t.p1.z*bc.y + t.p2.z*bc.z;

-

 				if(z <= zbuf[sp->p.x+sp->p.y*Dx(fb->r)])

 					continue;

 				zbuf[sp->p.x+sp->p.y*Dx(fb->r)] = z;

+				cbuf[0] = 0xFF;

+				cbuf[1] = 0xFF*z;

+				cbuf[2] = 0xFF*z;

+				cbuf[3] = 0xFF*z;

+				memfillcolor(sp->frag, *(ulong*)cbuf);

+				pixel(zfb, sp->p, sp->frag);

+

 				n = normvec3(crossvec3(subpt3(t.p2, t.p0), subpt3(t.p1, t.p0)));

 				intensity = dotvec3(n, light);

 				/* back-face culling */

@@ -520,7 +527,7 @@

 {

 	lockdisplay(display);

 	draw(screen, screen->r, display->black, nil, ZP);

-	loadimage(screen, rectaddpt(fb->r, screen->r.min), byteaddr(fb, fb->r.min), bytesperline(fb->r, fb->depth)*Dy(fb->r));

+	loadimage(screen, rectaddpt(curfb->r, screen->r.min), byteaddr(curfb, curfb->r.min), bytesperline(curfb->r, curfb->depth)*Dy(curfb->r));

 	flushimage(display, 1);

 	unlockdisplay(display);

 }

@@ -536,11 +543,6 @@

 		t1 = nanosec();

 		fprint(2, "shader took %lludns\n", t1-t0);

 	}else{

-//		t0 = nanosec();

-//		shade(fb, circleshader);

-//		t1 = nanosec();

-//		fprint(2, "shader took %lludns\n", t1-t0);

-//

 //		bresenham(fb, Pt(40,40), Pt(300,300), red);

 //		bresenham(fb, Pt(80,80), Pt(100,200), red);

 //		bresenham(fb, Pt(80,80), Pt(200,100), red);

@@ -551,10 +553,6 @@

 //		triangle(fb, Pt(300,120), Pt(200,350), Pt(50, 210), red);

 //		filltriangle(fb, Pt(400,230), Pt(450,180), Pt(150, 320), blue);

 //		triangle(fb, Pt(400,230), Pt(450,180), Pt(150, 320), red);

-//

-//		t0 = nanosec();

-//		shade(fb, triangleshader);

-//		t1 = nanosec();

 		t0 = nanosec();

 		shade(fb, sfshader);

@@ -564,11 +562,61 @@

 }

 void

-rmb(Mousectl *, Keyboardctl *)

+renderer(void *)

 {

+	threadsetname("renderer");

+

+	render();

+	rendering = 0;

+	nbsendp(drawc, nil);

+	threadexits(nil);

 }

 void

+scrsync(void *)

+{

+	Ioproc *io;

+

+	threadsetname("scrsync");

+

+	io = ioproc();

+	while(rendering){

+		nbsendp(drawc, nil);

+		iosleep(io, 2000);

+	}

+	closeioproc(io);

+	threadexits(nil);

+}

+

+static char *

+genrmbmenuitem(int idx)

+{

+	enum {

+		TOGGLEZBUF,

+	};

+

+	if(idx == TOGGLEZBUF)

+		return curfb == zfb? "hide z-buffer": "show z-buffer";

+	return nil;

+}

+

+void

+rmb(Mousectl *mc, Keyboardctl *)

+{

+	enum {

+		TOGGLEZBUF,

+	};

+	static Menu menu = { .gen = genrmbmenuitem };

+

+	switch(menuhit(3, mc, &menu, _screen)){

+	case TOGGLEZBUF:

+		curfb = curfb == fb? zfb: fb;

+		break;

+	}

+	nbsendp(drawc, nil);

+}

+

+void

 lmb(Mousectl *, Keyboardctl *)

 {

 }

@@ -643,6 +691,8 @@

 	fb = eallocmemimage(rectsubpt(screen->r, screen->r.min), screen->chan);

 	zbuf = emalloc(Dx(fb->r)*Dy(fb->r)*sizeof(double));

 	memset(zbuf, ~0, Dx(fb->r)*Dy(fb->r)*sizeof(double));

+	zfb = eallocmemimage(fb->r, fb->chan);

+	curfb = fb;

 	red = rgb(DRed);

 	green = rgb(DGreen);

 	blue = rgb(DBlue);

@@ -652,12 +702,13 @@

 	if(texpath != nil && (modeltex = readtga(texpath)) == nil)

 		sysfatal("readtga: %r");

-	render();

-

 	drawc = chancreate(sizeof(void*), 1);

 	display->locking = 1;

 	unlockdisplay(display);

-	nbsend(drawc, nil);

+

+	rendering = 1;

+	proccreate(renderer, nil, mainstacksize);

+	threadcreate(scrsync, nil, mainstacksize);

 	for(;;){

 		enum { MOUSE, RESIZE, KEYBOARD, DRAW };