shithub: libgraphics

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add initial support for OBJMaterial properties.

--- a/graphics.h

+++ b/graphics.h

@@ -8,6 +8,7 @@

 enum {

 	LIGHT_POINT,

 	LIGHT_DIRECTIONAL,

+	LIGHT_SPOT,

 };

 typedef struct Color Color;

@@ -51,7 +52,9 @@

 struct Material

 {

-	int stub;

+	Color ambient;

+	Color diffuse;

+	Color specular;

 };

 struct Model

@@ -178,6 +181,7 @@

 void rmviewport(Viewport*);

 /* render */

+Point3 model2world(Entity*, Point3);

 Point3 world2vcs(Camera*, Point3);

 Point3 vcs2clip(Camera*, Point3);

 Point3 world2clip(Camera*, Point3);

--- a/render.c

+++ b/render.c

@@ -118,6 +118,7 @@

 			perc = d0/(d0 - d1);

 			v.p = lerp3(v0->p, v1->p, perc);

 			v.uv = lerp2(v0->uv, v1->uv, perc);

+			v.c = lerp3((Point3)v0->c, (Point3)v1->c, perc);

 			v.intensity = flerp(v0->intensity, v1->intensity, perc);

 			addvert(&Vout, v);

@@ -146,6 +147,16 @@

 }

 /*

+ * transforms p from e's reference frame into

+ * the world.

+ */

+Point3

+model2world(Entity *e, Point3 p)

+{

+	return invrframexform3(p, *e);

+}

+

+/*

  * transforms p from the world reference frame

  * to c's one (aka Viewing Coordinate System).

  */

@@ -252,6 +263,7 @@

 {

 	FSparams fsp;

 	Triangle2 t₂, tt₂;

+	Triangle3 ct;

 	Rectangle bbox;

 	Point p, tp;

 	Point3 bc;

@@ -276,9 +288,9 @@

 	fsp.cbuf = cbuf;

 	/* perspective-divide the attributes */

-//	t[0].c = mulpt3(t[0].c, t[0].p.w);

-//	t[1].c = mulpt3(t[1].c, t[1].p.w);

-//	t[2].c = mulpt3(t[2].c, t[2].p.w);

+	t[0].c = mulpt3(t[0].c, t[0].p.w);

+	t[1].c = mulpt3(t[1].c, t[1].p.w);

+	t[2].c = mulpt3(t[2].c, t[2].p.w);

 	t[0].uv = mulpt2(t[0].uv, t[0].p.w);

 	t[1].uv = mulpt2(t[1].uv, t[1].p.w);

 	t[2].uv = mulpt2(t[2].uv, t[2].p.w);

@@ -304,9 +316,9 @@

 			z = 1.0/(z < 1e-5? 1e-5: z);

 			/* lerp attribute and dissolve perspective */

-//			t[0].c = mulpt3(t[0].c, bc.x*z);

-//			t[1].c = mulpt3(t[1].c, bc.y*z);

-//			t[2].c = mulpt3(t[2].c, bc.z*z);

+			ct.p0 = mulpt3(t[0].c, bc.x*z);

+			ct.p1 = mulpt3(t[1].c, bc.y*z);

+			ct.p2 = mulpt3(t[2].c, bc.z*z);

 			if((t[0].uv.w + t[1].uv.w + t[2].uv.w) != 0){

 				tt₂.p0 = mulpt2(t[0].uv, bc.x*z);

@@ -330,8 +342,12 @@

 					cbuf[0] = 0xFF;

 					break;

 				}

-			}else

-				memset(cbuf, 0xFF, sizeof cbuf);

+			}else{

+				cbuf[0] = (ct.p0.w + ct.p1.w + ct.p2.w)*0xFF;

+				cbuf[1] = (ct.p0.z + ct.p1.z + ct.p2.z)*0xFF;

+				cbuf[2] = (ct.p0.y + ct.p1.y + ct.p2.y)*0xFF;

+				cbuf[3] = (ct.p0.x + ct.p1.x + ct.p2.x)*0xFF;

+			}

 			params->var_intensity[0] = t[0].intensity;

 			params->var_intensity[1] = t[1].intensity;

@@ -353,7 +369,7 @@

 	OBJElem **ep, **eb, **ee;

 	Point3 n;				/* surface normal */

 	Triangle *t;				/* triangles to raster */

-	int nt;

+	int i, nt;

 	params = arg;

 	vsp.su = params;

@@ -398,6 +414,14 @@

 		}else{

 			t[0][0].uv = t[0][1].uv = t[0][2].uv = Vec2(0,0);

 		}

+

+		if((*ep)->mtl != nil)

+			for(i = 0; i < 3; i++){

+				t[0][i].c.r = (*ep)->mtl->Kd.r;

+				t[0][i].c.g = (*ep)->mtl->Kd.g;

+				t[0][i].c.b = (*ep)->mtl->Kd.b;

+				t[0][i].c.a = (*ep)->mtl->d;

+			}

 		vsp.v = &t[0][0];

 		vsp.idx = 0;

--- a/scene.c

+++ b/scene.c

@@ -28,6 +28,7 @@

 		idxtab = &e->indextab[OBJVGeometric];

 		newe[nt++] = emalloc(sizeof **newe);

 		newe[nt-1]->type = OBJEFace;

+		newe[nt-1]->mtl = e->mtl;

 		newidxtab = &newe[nt-1]->indextab[OBJVGeometric];

 		newidxtab->nindex = 3;

 		newidxtab->indices = emalloc(newidxtab->nindex*sizeof(*newidxtab->indices));