* Replaced the three X/Y/Z sliders that controlled the texture size in sculpt

mode with a single slider. (Doesn't seem likely the user is going to want to
  scale in one axis differently from another.) Additionally, the new slider
  works correctly in Tile mode in addition to 3D mode. In Tile mode, the slider
  value is considered pixel units.

In the process, found and fixed a few sculptmode bugs
* When loading a file that is already in sculptmode, initialize sculptdata
  as soon as the first sculpt/partial-visibility operation occurs
* Bug in the undo_push code; reading from free'd memory

source/blender/makesdna/DNA_scene_types.h

@@ -414,13 +414,14 @@ typedef struct SculptData
 	short symm_x, symm_y, symm_z;
 
 	/* For the Brush Shape */
-	float texsize[3];
+	short texscale;
 	short texact, texnr;
 	short spacing;
+	char pad[2];
 	char texrept;
 	char texfade;
 
-	char averaging, pad[3];
+	char averaging, pad2[3];
 } SculptData;
 
 #define SCULPTREPT_DRAG 1

source/blender/src/buttons_editing.c

@@ -4140,9 +4140,7 @@ void sculptmode_draw_interface_textures(uiBlock *block, unsigned short cx, unsig
 			uiDefButC(block,ROW,B_NOP, "3D",   cx+78,cy,37,19, &sd->texrept, 18,SCULPTREPT_3D,  0,0,"Use vertex coords as texture coordinates");
 			cy-= 20;
 
-			uiDefButF(block,NUM,B_NOP, "X",    cx,   cy,39,19, &sd->texsize[0],-20,20,10,0,"Scaling factor for texture's X axis");
+			uiDefButS(block,NUM,B_NOP, "Scale", cx,cy,115,19, &sd->texscale,1,1000,0,0,"Scaling factor for texture axis");
-			uiDefButF(block,NUM,B_NOP, "Y",    cx+39,cy,38,19, &sd->texsize[1],-20,20,10,0,"Scaling factor for texture's Y axis");
-			uiDefButF(block,NUM,B_NOP, "Z",    cx+78,cy,38,19, &sd->texsize[2],-20,20,10,0,"Scaling factor for texture's Z axis");
 			cy-= 20;
 			
 			uiDefButC(block,TOG,B_NOP, "Fade", cx,cy,50,19, &sd->texfade, 0,0,0,0,"Smooth the edges of the texture");

source/blender/src/sculptmode.c

@@ -172,7 +172,7 @@ void sculptmode_init(Scene *sce)
 	sd->texact= -1;
 	sd->texfade= 1;
 	sd->averaging= 1;
-	sd->texsize[0]= sd->texsize[1]= sd->texsize[2]= 1;
+	sd->texscale= 100;
 	sd->texrept= SCULPTREPT_DRAG;
 }
 
@@ -276,11 +276,12 @@ void sculptmode_undo_push(char *str, int verts, int fe, int pv)
 {
 	int cnt= 7;
 	SculptUndo *su= G.scene->sculptdata.undo;
-	SculptUndoStep *n= MEM_callocN(sizeof(SculptUndoStep), "SculptUndo"), *sus, *chop;
+	SculptUndoStep *n= MEM_callocN(sizeof(SculptUndoStep), "SculptUndo"), *sus, *chop, *path;
 	Mesh *me= get_mesh(G.scene->sculptdata.active_ob);
 
 	/* Chop off undo data after cur */
-	for(sus= su->steps.last; sus && sus != su->cur; sus= sus->prev) {
+	for(sus= su->steps.last; sus && sus != su->cur; sus= path) {
+		path= sus->prev;
 		sculptmode_undo_free_link(sus);
 		BLI_freelinkN(&su->steps, sus);
 	}
@@ -311,7 +312,8 @@ void sculptmode_undo_push(char *str, int verts, int fe, int pv)
 		/* Make sure that non-vert data isn't lost */
 		sculptmode_undo_pull_chopped(chop);
 	
-		for(sus= su->steps.first; sus && sus != chop; sus= sus->next) {
+		for(sus= su->steps.first; sus && sus != chop; sus= path) {
+			path= sus->next;
 			sculptmode_undo_free_link(sus);
 			BLI_freelinkN(&su->steps, sus);
 		}
@@ -394,6 +396,7 @@ void sculptmode_undo_update(SculptUndoStep *newcur)
 	if(modifiers_getVirtualModifierList(ob))
 		DAG_object_flush_update(G.scene, OBACT, OB_RECALC_DATA);
 
+	if(G.vd->depths) G.vd->depths->damaged= 1;
 	allqueue(REDRAWVIEW3D, 0);
 }
 
@@ -810,15 +813,16 @@ float tex_strength(EditData *e, float *point, const float len,const unsigned vin
 		avg= 1;
 	else if(G.scene->sculptdata.texrept==SCULPTREPT_3D) {
 		float jnk;
+		const float factor= 0.01;
 		MTex mtex;
 		memset(&mtex,0,sizeof(MTex));
 		mtex.tex= G.scene->sculptdata.mtex[G.scene->sculptdata.texact]->tex;
 		mtex.projx= 1;
 		mtex.projy= 2;
 		mtex.projz= 3;
-		mtex.size[0]= G.scene->sculptdata.texsize[0];
+		mtex.size[0]= G.scene->sculptdata.texscale * factor;
-		mtex.size[1]= G.scene->sculptdata.texsize[1];
+		mtex.size[1]= G.scene->sculptdata.texscale * factor;
-		mtex.size[2]= G.scene->sculptdata.texsize[2];
+		mtex.size[2]= G.scene->sculptdata.texscale * factor;
 		
 		externtex(&mtex,point,&avg,&jnk,&jnk,&jnk,&jnk);
 	} else {
@@ -871,10 +875,12 @@ float tex_strength(EditData *e, float *point, const float len,const unsigned vin
 		py= magn * sin(theta) + cx;
 
 		if(G.scene->sculptdata.texrept==SCULPTREPT_TILE) {
+			const float scale= G.scene->sculptdata.texscale;
 			px+= e->mouse[0];
 			py+= e->mouse[1];
-			p= ri->rect + (py%ri->pr_recty) * ri->pr_rectx + (px%ri->pr_rectx);
+			px%= (int)scale;
-			p= ri->rect + (projverts[vindex].co[1]%ri->pr_recty) * ri->pr_rectx + (projverts[vindex].co[0]%ri->pr_rectx);
+			py%= (int)scale;
+			p= ri->rect + (int)(ri->pr_recty*py/scale) * ri->pr_rectx + (int)(ri->pr_rectx*px/scale);
 		}
 		else p= ri->rect + py * ri->pr_rectx + px;
 		
@@ -1436,6 +1442,18 @@ void sculptmode_draw_mesh(ListBase *damaged_rects) {
 	glDisable(GL_DEPTH_TEST);
 }
 
+void sculptmode_correct_state()
+{
+	if(get_mesh(G.scene->sculptdata.active_ob) != get_mesh(OBACT))
+		set_sculpt_object(OBACT);
+
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glEnableClientState(GL_NORMAL_ARRAY);
+	
+	if(!G.scene->sculptdata.vertex_users) calc_vertex_users();
+	if(!G.scene->sculptdata.undo) sculptmode_undo_init();
+}
+
 void sculpt()
 {
 	Object *ob= 0;
@@ -1473,6 +1491,7 @@ void sculpt()
 
 	/* Make sure sculptdata has been init'd properly */
 	if(!G.scene->sculptdata.vertex_users) calc_vertex_users();
+	if(!G.scene->sculptdata.undo) sculptmode_undo_init();
 	
 	/* Init texture
 	   FIXME: Shouldn't be doing this every time! */
@@ -1928,6 +1947,8 @@ void sculptmode_pmv(int mode)
 {
 	Object *ob= OBACT;
 	rcti hb_2d= sculptmode_pmv_box(); /* Get 2D hide box */
+	
+	sculptmode_correct_state();
 
 	waitcursor(1);