From 4537061e55b95324a39962bc9d88a4485fb650b9 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Thu, 22 Dec 2011 05:39:23 +0000
Subject: [PATCH] patch [#29673] Visualize Indices (developer aid) by Howard
 Trickey (howardt)

---
 release/scripts/startup/bl_ui/space_view3d.py |  2 +
 .../blender/editors/space_view3d/drawobject.c | 43 +++++++++++++++++++
 source/blender/makesdna/DNA_mesh_types.h      |  3 ++
 source/blender/makesrna/intern/rna_mesh.c     |  5 +++
 4 files changed, 53 insertions(+)

diff --git a/release/scripts/startup/bl_ui/space_view3d.py b/release/scripts/startup/bl_ui/space_view3d.py
index 57bde4eb0dd..46a569c71d4 100644
--- a/release/scripts/startup/bl_ui/space_view3d.py
+++ b/release/scripts/startup/bl_ui/space_view3d.py
@@ -2247,6 +2247,8 @@ class VIEW3D_PT_view3d_meshdisplay(Panel):
         col.prop(mesh, "show_extra_edge_length")
         col.prop(mesh, "show_extra_face_angle")
         col.prop(mesh, "show_extra_face_area")
+        if bpy.app.debug:
+          col.prop(mesh, "show_extra_indices")
 
 
 class VIEW3D_PT_view3d_curvedisplay(Panel):
diff --git a/source/blender/editors/space_view3d/drawobject.c b/source/blender/editors/space_view3d/drawobject.c
index 3199c00a32a..eb6f50b932f 100644
--- a/source/blender/editors/space_view3d/drawobject.c
+++ b/source/blender/editors/space_view3d/drawobject.c
@@ -2793,6 +2793,44 @@ static void draw_em_measure_stats(View3D *v3d, RegionView3D *rv3d,
 	}
 }
 
+static void draw_em_indices(EditMesh *em)
+{
+	EditEdge *e;
+	EditFace *f;
+	EditVert *v;
+	int i;
+	char val[32];
+	float pos[3];
+	unsigned char col[4];
+
+	/* For now, reuse appropriate theme colors from stats text colors */
+
+	UI_GetThemeColor3ubv(TH_DRAWEXTRA_FACEANG, col);
+	for (v = em->verts.first, i = 0; v; v = v->next, i++) {
+		if (v->f & SELECT) {
+			sprintf(val, "%d", i);
+			view3d_cached_text_draw_add(v->co, val, 0, V3D_CACHE_TEXT_ASCII, col);
+		}
+	}
+
+	UI_GetThemeColor3ubv(TH_DRAWEXTRA_EDGELEN, col);
+	for (e = em->edges.first, i = 0; e; e = e->next, i++) {
+		if (e->f & SELECT) {
+			sprintf(val, "%d", i);
+			mid_v3_v3v3(pos, e->v1->co, e->v2->co);
+			view3d_cached_text_draw_add(pos, val, 0, V3D_CACHE_TEXT_ASCII, col);
+		}
+	}
+
+	UI_GetThemeColor3ubv(TH_DRAWEXTRA_FACEAREA, col);
+	for (f = em->faces.first, i = 0; f; f = f->next, i++) {
+		if (f->f & SELECT) {
+			sprintf(val, "%d", i);
+			view3d_cached_text_draw_add(f->cent, val, 0, V3D_CACHE_TEXT_ASCII, col);
+		}
+	}
+}
+
 static int draw_em_fancy__setFaceOpts(void *UNUSED(userData), int index, int *UNUSED(drawSmooth_r))
 {
 	EditFace *efa = EM_get_face_for_index(index);
@@ -2968,6 +3006,11 @@ static void draw_em_fancy(Scene *scene, View3D *v3d, RegionView3D *rv3d,
 		{
 			draw_em_measure_stats(v3d, rv3d, ob, em, &scene->unit);
 		}
+
+		if ((G.f & G_DEBUG) && (me->drawflag & ME_DRAWEXTRA_INDICES) &&
+		    !(v3d->flag2 & V3D_RENDER_OVERRIDE)) {
+			draw_em_indices(em);
+		}
 	}
 
 	if(dt>OB_WIRE) {
diff --git a/source/blender/makesdna/DNA_mesh_types.h b/source/blender/makesdna/DNA_mesh_types.h
index 7d57e2c295c..f8062aeccc7 100644
--- a/source/blender/makesdna/DNA_mesh_types.h
+++ b/source/blender/makesdna/DNA_mesh_types.h
@@ -162,6 +162,9 @@ typedef struct TFace {
 #define ME_DRAWEXTRA_FACEAREA (1 << 11)
 #define ME_DRAWEXTRA_FACEANG  (1 << 12)
 
+/* debug only option */
+#define ME_DRAWEXTRA_INDICES (1 << 13)
+
 /* old global flags:
 #define G_DRAWEDGES		(1 << 18)
 #define G_DRAWFACES		(1 <<  7)
diff --git a/source/blender/makesrna/intern/rna_mesh.c b/source/blender/makesrna/intern/rna_mesh.c
index 02be3183f2c..f6e958ab1f5 100644
--- a/source/blender/makesrna/intern/rna_mesh.c
+++ b/source/blender/makesrna/intern/rna_mesh.c
@@ -2132,6 +2132,11 @@ static void rna_def_mesh(BlenderRNA *brna)
 	                         "Display the area of selected faces, using global values when set in the transform panel");
 	RNA_def_property_update(prop, 0, "rna_Mesh_update_draw");
 
+	prop= RNA_def_property(srna, "show_extra_indices", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "drawflag", ME_DRAWEXTRA_INDICES);
+	RNA_def_property_ui_text(prop, "Indices", "Displays the index numbers of selected vertices, edges, and faces");
+	RNA_def_property_update(prop, 0, "rna_Mesh_update_draw");
+
 	/* editflag */
 	prop= RNA_def_property(srna, "use_mirror_x", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_sdna(prop, NULL, "editflag", ME_EDIT_MIRROR_X);