shithub: libgraphics

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pass material properties to the fshader.

this way users can refer to per-surface material features
when shading pixels.

--- a/render.c

+++ b/render.c

@@ -415,7 +415,7 @@

 		}

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

-		if(params->entity->mdl->tex != nil && idxtab->nindex == 3){

+		if(idxtab->nindex == 3){

 			t[0][0].uv = Pt2(tverts[idxtab->indices[0]].u,

 					 tverts[idxtab->indices[0]].v, 1);

 			t[0][1].uv = Pt2(tverts[idxtab->indices[1]].u,

--- a/vertex.c

+++ b/vertex.c

@@ -53,6 +53,7 @@

 	v->n = lerp3(v0->n, v1->n, t);

 	v->c = lerp3(v0->c, v1->c, t);

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

+	v->mtl = v0->mtl != nil? v0->mtl: v1->mtl;

 	v->attrs = nil;

 	v->nattrs = 0;

 	for(i = 0; i < v0->nattrs; i++){

@@ -87,6 +88,7 @@

 		mulpt2(v0->uv, bc.x),

 		mulpt2(v1->uv, bc.y)),

 		mulpt2(v2->uv, bc.z));

+	v->mtl = v0->mtl != nil? v0->mtl: v1->mtl != nil? v1->mtl: v2->mtl;

 	v->attrs = nil;

 	v->nattrs = 0;

 	for(i = 0; i < v0->nattrs; i++){