shithub: tinyrend

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add knobs to control fb's dimensions. make the light an actual global.

--- a/main.c

+++ b/main.c

@@ -78,6 +78,7 @@

 int shownormals;

 char winspec[32];

+Point3 light = {0,-1,1,1};	/* global directional light */

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

 Point3 center = {0,0,0,1};

 Point3 up = {0,1,0,0};

@@ -413,10 +414,7 @@

 Point3

 vertshader(VSparams *sp)

 {

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

-	light = subpt3(camera, center);

-

-	sp->su->var_intensity[sp->idx] = fmax(0, dotvec3(sp->n, normvec3(light)));

+	sp->su->var_intensity[sp->idx] = fmax(0, dotvec3(sp->n, light));

 	return xform3(sp->p, view);

 }

@@ -425,9 +423,7 @@

 {

 	double intens;

-	intens = sp->su->var_intensity[0]*sp->bc.x;

-	intens += sp->su->var_intensity[1]*sp->bc.y;

-	intens += sp->su->var_intensity[2]*sp->bc.z;

+	intens = dotvec3(Vec3(sp->su->var_intensity[0], sp->su->var_intensity[1], sp->su->var_intensity[2]), sp->bc);

 	sp->cbuf[1] *= intens;

 	sp->cbuf[2] *= intens;

 	sp->cbuf[3] *= intens;

@@ -441,9 +437,7 @@

 {

 	double intens;

-	intens = sp->su->var_intensity[0]*sp->bc.x;

-	intens += sp->su->var_intensity[1]*sp->bc.y;

-	intens += sp->su->var_intensity[2]*sp->bc.z;

+	intens = dotvec3(Vec3(sp->su->var_intensity[0], sp->su->var_intensity[1], sp->su->var_intensity[2]), sp->bc);

 	intens = intens > 0.85? 1: intens > 0.60? 0.80: intens > 0.45? 0.60: intens > 0.30? 0.45: intens > 0.15? 0.30: 0;

 	sp->cbuf[1] = 0;

 	sp->cbuf[2] = 155*intens;

@@ -588,7 +582,7 @@

 			nt.p0.x*bc.x + nt.p1.x*bc.y + nt.p2.x*bc.z,

 			nt.p0.y*bc.x + nt.p1.y*bc.y + nt.p2.y*bc.z,

 			nt.p0.z*bc.x + nt.p1.z*bc.y + nt.p2.z*bc.z);

-		np1 = addpt3(np0, mulpt3(np1, 50));

+		np1 = addpt3(np0, mulpt3(np1, Dx(fb->r)/32));

 		triangle(nfb, Pt(st₂.p0.x,st₂.p0.y), Pt(st₂.p1.x,st₂.p1.y), Pt(st₂.p2.x,st₂.p2.y), red);

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

@@ -934,6 +928,7 @@

 	char *mdlpath, *texpath;

 	char *sname;

 	double θ;

+	int fbw, fbh;

 	GEOMfmtinstall();

 	mdlpath = "mdl/def.obj";

@@ -940,6 +935,8 @@

 	texpath = nil;

 	sname = "gouraud";

 	θ = 0;

+	fbw = 200;

+	fbh = 200;

 	ARGBEGIN{

 	case 'n':

 		nprocs = strtoul(EARGF(usage()), nil, 10);

@@ -951,7 +948,7 @@

 		texpath = EARGF(usage());

 		break;

 	case 'a':

-		θ = strtoul(EARGF(usage()), nil, 10)*DEG;

+		θ = strtod(EARGF(usage()), nil)*DEG;

 		break;

 	case 'z':

 		camera.z = strtod(EARGF(usage()), nil);

@@ -959,6 +956,12 @@

 	case 's':

 		sname = EARGF(usage());

 		break;

+	case 'W':

+		fbw = strtoul(EARGF(usage()), nil, 10);

+		break;

+	case 'H':

+		fbh = strtoul(EARGF(usage()), nil, 10);

+		break;

 	default: usage();

 	}ARGEND;

 	if(argc != 0)

@@ -975,7 +978,20 @@

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

 		sysfatal("readtga: %r");

-	snprint(winspec, sizeof winspec, "-dx %d -dy %d", 200, 200);

+	{

+		int i, nv[OBJNVERT], nf;

+		OBJObject *o;

+		OBJElem *e;

+

+		nf = 0;

+		memset(nv, 0, sizeof nv);

+		for(i = 0; i < OBJNVERT; i++) nv[i] += model->vertdata[i].nvert;

+		for(i = 0; i < OBJHTSIZE; i++) if((o = model->objtab[i]) != nil)

+		for(e = o->child; e != nil; e = e->next) if(e->type == OBJEFace) nf++;

+		fprint(2, "v %d vn %d vt %d f %d\n", nv[OBJVGeometric], nv[OBJVNormal], nv[OBJVTexture], nf);

+	}

+

+	snprint(winspec, sizeof winspec, "-dx %d -dy %d", fbw, fbh);

 	if(newwindow(winspec) < 0)

 		sysfatal("newwindow: %r");

 	if(initdraw(nil, nil, "tinyrend") < 0)

@@ -997,24 +1013,6 @@

 	green = rgb(DGreen);

 	blue = rgb(DBlue);

-	{

-		int i, nv[OBJNVERT], nf;

-		OBJObject *o;

-		OBJElem *e;

-

-		nf = 0;

-		memset(nv, 0, sizeof nv);

-		for(i = 0; i < OBJNVERT; i++) nv[i] += model->vertdata[i].nvert;

-		for(i = 0; i < OBJHTSIZE; i++) if((o = model->objtab[i]) != nil)

-		for(e = o->child; e != nil; e = e->next) if(e->type == OBJEFace) nf++;

-		fprint(2, "v %d vn %d vt %d f %d\n", nv[OBJVGeometric], nv[OBJVNormal], nv[OBJVTexture], nf);

-	}

-

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

-	donedrawc = chancreate(sizeof(void*), 1);

-	display->locking = 1;

-	unlockdisplay(display);

-

 	Matrix3 yrot = {

 		cos(θ), 0, -sin(θ), 0,

 		0, 1, 0, 0,

@@ -1028,6 +1026,12 @@

 	mulm3(rota, yrot);

 	mulm3(proj, rota);

 	mulm3(view, proj);

+	light = normvec3(subpt3(light, center));

+

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

+	donedrawc = chancreate(sizeof(void*), 1);

+	display->locking = 1;

+	unlockdisplay(display);

 	proccreate(renderer, s, mainstacksize);