shithub: tinyrend

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added texture mapping.

diff: cannot open b/tex//null: file does not exist: 'b/tex//null'

--- a/main.c

+++ b/main.c

@@ -35,6 +35,7 @@

 double *zbuf;

 Memimage *red, *green, *blue;

 OBJ *model;

+Memimage *modeltex;

 Channel *drawc;

 int nprocs;

@@ -43,6 +44,28 @@

 void resized(void);

 uvlong nanosec(void);

+int

+min(int a, int b)

+{

+	return a < b? a: b;

+}

+

+int

+max(int a, int b)

+{

+	return a > b? a: b;

+}

+

+void

+swap(int *a, int *b)

+{

+	int t;

+

+	t = *a;

+	*a = *b;

+	*b = t;

+}

+

 void *

 emalloc(ulong n)

 {

@@ -96,16 +119,43 @@

 	return i;

 }

-int

-min(int a, int b)

+static void

+decproc(void *arg)

 {

-	return a < b? a: b;

+	int fd, *pfd;

+

+	pfd = arg;

+	fd = pfd[2];

+

+	close(pfd[0]);

+	dup(fd, 0);

+	close(fd);

+	dup(pfd[1], 1);

+	close(pfd[1]);

+

+	execl("/bin/tga", "tga", "-9t", nil);

+	threadexitsall("execl: %r");

 }

-int

-max(int a, int b)

+Memimage *

+readtga(char *path)

 {

-	return a > b? a: b;

+	Memimage *i;

+	int fd, pfd[3];

+

+	if(pipe(pfd) < 0)

+		sysfatal("pipe: %r");

+	fd = open(path, OREAD);

+	if(fd < 0)

+		sysfatal("open: %r");

+	pfd[2] = fd;

+	procrfork(decproc, pfd, mainstacksize, RFFDG|RFNAMEG|RFNOTEG);

+	close(pfd[1]);

+	i = readmemimage(pfd[0]);

+	close(pfd[0]);

+	close(fd);

+

+	return i;

 }

 Memimage *

@@ -130,16 +180,6 @@

 }

 void

-swap(int *a, int *b)

-{

-	int t;

-

-	t = *a;

-	*a = *b;

-	*b = t;

-}

-

-void

 bresenham(Memimage *dst, Point p0, Point p1, Memimage *src)

 {

 	int steep = 0, Δe, e, Δy;

@@ -342,19 +382,20 @@

 {

 	OBJObject *o;

 	OBJElem *e;

-	OBJVertex *verts;

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

 	OBJIndexArray *idxtab;

 	Triangle3 t;

-	Triangle2 st;

+	Triangle2 st, tt;			/* screen and texture triangles */

 	Rectangle bbox;

-	Point3 bc;

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

-	Point3 n;

+	Point3 bc, n;				/* barycentric coords and surface normal */

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

+	Point tp;				/* texture point */

 	int i;

-	uchar cbuf[4];

+	uchar cbuf[4], cbuf2[4];

 	double z, intensity;

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

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

 	for(i = 0; i < nelem(model->objtab); i++)

 		for(o = model->objtab[i]; o != nil; o = o->next)

@@ -398,11 +439,34 @@

 				if(intensity < 0)

 					continue;

-				cbuf[0] = 0xFF;

-				cbuf[1] = 0xFF*intensity;

-				cbuf[2] = 0xFF*intensity;

-				cbuf[3] = 0xFF*intensity;

+				idxtab = &e->indextab[OBJVTexture];

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

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

+					tt.p1 = Pt2(tverts[idxtab->indices[1]].u, tverts[idxtab->indices[1]].v, 1);

+					tt.p2 = Pt2(tverts[idxtab->indices[2]].u, tverts[idxtab->indices[2]].v, 1);

+					tt.p0 = mulpt2(tt.p0, bc.x);

+					tt.p1 = mulpt2(tt.p1, bc.y);

+					tt.p2 = mulpt2(tt.p2, bc.z);

+

+					tp.x = (tt.p0.x + tt.p1.x + tt.p2.x)*Dx(modeltex->r);

+					tp.y = Dy(modeltex->r)-(tt.p0.y + tt.p1.y + tt.p2.y)*Dy(modeltex->r);

+

+					unloadmemimage(modeltex, rectaddpt(Rect(0,0,1,1), tp), cbuf2, sizeof cbuf2);

+					cbuf[0] = cbuf2[3];

+					cbuf[1] = cbuf2[0];

+					cbuf[2] = cbuf2[1];

+					cbuf[3] = cbuf2[2];

+				}else{

+					cbuf[0] = 0xFF;

+					cbuf[1] = 0xFF;

+					cbuf[2] = 0xFF;

+					cbuf[3] = 0xFF;

+				}

+				cbuf[1] *= intensity;

+				cbuf[2] *= intensity;

+				cbuf[3] *= intensity;

+

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

 				return sp->frag;

 			}

@@ -485,7 +549,7 @@

 void

 usage(void)

 {

-	fprint(2, "usage: %s [-n nprocs] [-m objfile]\n", argv0);

+	fprint(2, "usage: %s [-n nprocs] [-m objfile] [-t texfile]\n", argv0);

 	exits("usage");

 }

@@ -495,10 +559,11 @@

 	Mousectl *mc;

 	Keyboardctl *kc;

 	Rune r;

-	char *mdlpath;

+	char *mdlpath, *texpath;

 	GEOMfmtinstall();

 	mdlpath = nil;

+	texpath = nil;

 	ARGBEGIN{

 	case 'n':

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

@@ -506,6 +571,9 @@

 	case 'm':

 		mdlpath = EARGF(usage());

 		break;

+	case 't':

+		texpath = EARGF(usage());

+		break;

 	default: usage();

 	}ARGEND;

 	if(argc != 0)

@@ -535,6 +603,8 @@

 	if(mdlpath != nil && (model = objparse(mdlpath)) == nil)

 		sysfatal("objparse: %r");

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

+		sysfatal("readtga: %r");

 	render();

binary files /dev/null b/tex/african_head_diffuse.tga differ