shithub: tinyrend

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add the option to visualize normals.

--- a/main.c

+++ b/main.c

@@ -34,7 +34,7 @@

 };

-Memimage *fb, *zfb, *curfb;

+Memimage *screenfb, *fb, *zfb, *nfb, *curfb;

 double *zbuf;

 Lock zbuflk;

 Memimage *red, *green, *blue;

@@ -44,6 +44,7 @@

 int nprocs;

 int rendering;

 int flag2;

+int shownormals;

 char winspec[32];

 Point3 camera = {0,0,3,1};

@@ -332,7 +333,7 @@

 }

 void

-filltriangle2(Memimage *dst, Triangle3 st, Triangle2 tt, double intensity, Memimage *frag)

+filltriangle2(Memimage *dst, Triangle3 st, Triangle3 nt, Triangle2 tt, double intensity, Memimage *frag)

 {

 	Rectangle bbox;

 	Point p, tp;

@@ -453,14 +454,15 @@

 {

 	SUparams *params;

 	Sparams sp;

-	OBJVertex *verts, *tverts;		/* geometric and texture vertices */

+	OBJVertex *verts, *tverts, *nverts;	/* geometric, texture and normals vertices */

 	OBJIndexArray *idxtab;

 	OBJElem **ep;

-	Triangle3 t, st;			/* world- and screen-space triangles */

+	Triangle3 t, st, nt;			/* world-, screen-space and normals triangles */

 	Triangle2 tt;				/* texture triangle */

 	Point3 n;				/* surface normal */

 	static Point3 light = {0,0,-1,0};	/* global light field */

 	double intensity;

+	Point3 np0, np1;

 	params = arg;

 	sp.frag = rgb(DBlack);

@@ -469,6 +471,7 @@

 	verts = model->vertdata[OBJVGeometric].verts;

 	tverts = model->vertdata[OBJVTexture].verts;

+	nverts = model->vertdata[OBJVNormal].verts;

 	for(ep = params->b; ep != params->e; ep++){

 		idxtab = &(*ep)->indextab[OBJVGeometric];

@@ -490,6 +493,18 @@

 		if(intensity <= 0)

 			continue;

+		np0 = centroid3(st);

+		np1 = addpt3(np0, mulpt3(n, 10));

+		bresenham(nfb, Pt(np0.x,np0.y), Pt(np1.x,np1.y), green);

+

+		idxtab = &(*ep)->indextab[OBJVNormal];

+		if(modeltex != nil && idxtab->nindex == 3){

+			nt.p0 = Vec3(nverts[idxtab->indices[0]].i, nverts[idxtab->indices[0]].j, nverts[idxtab->indices[0]].k);

+			nt.p1 = Vec3(nverts[idxtab->indices[1]].i, nverts[idxtab->indices[1]].j, nverts[idxtab->indices[1]].k);

+			nt.p2 = Vec3(nverts[idxtab->indices[2]].i, nverts[idxtab->indices[2]].j, nverts[idxtab->indices[2]].k);

+		}else

+			memset(&nt, 0, sizeof nt);

+

 		idxtab = &(*ep)->indextab[OBJVTexture];

 		if(modeltex != nil && idxtab->nindex == 3){

 			tt.p0 = Pt2(tverts[idxtab->indices[0]].u, tverts[idxtab->indices[0]].v, 1);

@@ -498,7 +513,7 @@

 		}else

 			memset(&tt, 0, sizeof tt);

-		filltriangle2(params->dst, st, tt, intensity, sp.frag);

+		filltriangle2(params->dst, st, nt, tt, intensity, sp.frag);

 	}

 	freememimage(sp.frag);

@@ -742,8 +757,11 @@

 redraw(void)

 {

 	lockdisplay(display);

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

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

+	memfillcolor(screenfb, DBlack);

+	memimagedraw(screenfb, screenfb->r, curfb, ZP, nil, ZP, SoverD);

+	if(shownormals)

+		memimagedraw(screenfb, screenfb->r, nfb, ZP, nil, ZP, SoverD);

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

 	flushimage(display, 1);

 	unlockdisplay(display);

 }

@@ -794,10 +812,15 @@

 {

 	enum {

 		TOGGLEZBUF,

+		TOGGLENORM,

 	};

-	if(idx == TOGGLEZBUF)

+	switch(idx){

+	case TOGGLEZBUF:

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

+	case TOGGLENORM:

+		return shownormals? "hide normals": "show normals";

+	}

 	return nil;

 }

@@ -806,6 +829,7 @@

 {

 	enum {

 		TOGGLEZBUF,

+		TOGGLENORM,

 	};

 	static Menu menu = { .gen = genrmbmenuitem };

@@ -813,6 +837,9 @@

 	case TOGGLEZBUF:

 		curfb = curfb == fb? zfb: fb;

 		break;

+	case TOGGLENORM:

+		shownormals ^= 1;

+		break;

 	}

 	nbsendp(drawc, nil);

 }

@@ -904,11 +931,13 @@

 	if((kc = initkeyboard(nil)) == nil)

 		sysfatal("initkeyboard: %r");

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

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

+	fb = eallocmemimage(screenfb->r, RGBA32);

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

 	memsetd(zbuf, Inf(-1), Dx(fb->r)*Dy(fb->r));

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

 	curfb = fb;

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

 	red = rgb(DRed);

 	green = rgb(DGreen);

 	blue = rgb(DBlue);