[Bf-blender-cvs] [11dead0] cycles-ptex-06: Add debug drawing code for showing poly vert order

[Nicholas Bishop]

Commit: 11dead00dda4a38cd45466fd0c3e6536e0556be4
Author: Nicholas Bishop
Date:   Wed Jan 7 19:14:00 2015 +0100
Branches: cycles-ptex-06
https://developer.blender.org/rB11dead00dda4a38cd45466fd0c3e6536e0556be4

Add debug drawing code for showing poly vert order

===================================================================

M	source/blender/editors/space_view3d/drawobject.c

===================================================================

diff --git a/source/blender/editors/space_view3d/drawobject.c b/source/blender/editors/space_view3d/drawobject.c
index 55b621d..25b76ba 100644
--- a/source/blender/editors/space_view3d/drawobject.c
+++ b/source/blender/editors/space_view3d/drawobject.c
@@ -3672,6 +3672,66 @@ static void draw_mesh_object_outline(View3D *v3d, Object *ob, DerivedMesh *dm)
 	}
 }
 
+static void dm_draw_vert_order(DerivedMesh *dm)
+{
+	typedef struct {
+		float pos[3], col[3];
+	} VertCol;
+
+	const MVert *verts = dm->getVertArray(dm);
+	const MPoly *polys = dm->getPolyArray(dm);
+	const MLoop *loops = dm->getLoopArray(dm);
+	int a, b;
+
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glEnableClientState(GL_COLOR_ARRAY);
+	glPushAttrib(GL_ENABLE_BIT);
+	glShadeModel(GL_SMOOTH);
+	/* TODO(bishop): should probably leave depth on and do an offset
+	 * or something */
+	glDisable(GL_DEPTH_TEST);
+	glDisable(GL_LIGHTING);
+
+	for (a = 0; a < dm->getNumPolys(dm); a++) {
+		const MPoly *p = &polys[a];
+		VertCol *points = MEM_callocN(sizeof(VertCol) * p->totloop, "points");
+
+		float avg[3] = {0, 0, 0};
+		for (b = 0; b < p->totloop; b++) {
+			const MLoop *l = &loops[p->loopstart + b];
+			const MVert *v = &verts[l->v];
+			copy_v3_v3(points[b].pos, v->co);
+			add_v3_v3(avg, v->co);
+
+			/* First line red, else green */
+			if (b <= 1) {
+				points[b].col[0] = 1;
+				points[b].col[1] = 0;
+			} else {
+				points[b].col[0] = 0;
+				points[b].col[1] = 1;
+			}
+		}
+
+		/* Move points in towards center a bit */
+		mul_v3_fl(avg, 1.0f / p->totloop);
+		for (b = 0; b < p->totloop; b++) {
+			interp_v3_v3v3(points[b].pos, points[b].pos, avg, 0.3);
+		}
+
+		glVertexPointer(3, GL_FLOAT, sizeof(VertCol), points);
+		glColorPointer(3, GL_FLOAT, sizeof(VertCol), &points[0].col);
+		glDrawArrays(GL_LINE_STRIP, 0, p->totloop);
+
+		MEM_freeN(points);
+	}
+
+	/* Reset all GL state */
+	glDisableClientState(GL_VERTEX_ARRAY);
+	glDisableClientState(GL_COLOR_ARRAY);
+	glPopAttrib();
+}
+
 static void draw_mesh_fancy(Scene *scene, ARegion *ar, View3D *v3d, RegionView3D *rv3d, Base *base,
                             const char dt, const unsigned char ob_wire_col[4], const short dflag)
 {
@@ -3922,6 +3982,8 @@ static void draw_mesh_fancy(Scene *scene, ARegion *ar, View3D *v3d, RegionView3D
 			ED_view3d_polygon_offset(rv3d, 0.0);
 		}
 	}
+
+	dm_draw_vert_order(dm);
 	
 	if (is_obact && BKE_paint_select_vert_test(ob)) {
 		const int use_depth = (v3d->flag & V3D_ZBUF_SELECT);