Modifiers: add callback to loop over each texture assigned to a modifier.

source/blender/blenkernel/BKE_modifier.h

@@ -101,6 +101,7 @@ typedef enum {
 
 typedef void (*ObjectWalkFunc)(void *userData, struct Object *ob, struct Object **obpoin);
 typedef void (*IDWalkFunc)(void *userData, struct Object *ob, struct ID **idpoin);
+typedef void (*TexWalkFunc)(void *userData, struct Object *ob, struct ModifierData *md, const char *propname);
 
 typedef struct ModifierTypeInfo {
 	/* The user visible name for this modifier */
@@ -284,6 +285,16 @@ typedef struct ModifierTypeInfo {
 	 */
 	void (*foreachIDLink)(struct ModifierData *md, struct Object *ob,
 						  IDWalkFunc walk, void *userData);
+
+	/* Should call the given walk function for each texture that the
+	 * modifier data stores. This is used for finding all textures in
+	 * the context for the UI.
+	 *
+	 * This function is optional. If it is not present, it will be
+	 * assumed the modifier has no textures.
+	 */
+	void (*foreachTexLink)(struct ModifierData *md, struct Object *ob,
+						  TexWalkFunc walk, void *userData);
 } ModifierTypeInfo;
 
 ModifierTypeInfo *modifierType_getInfo (ModifierType type);
@@ -315,6 +326,10 @@ void          modifiers_foreachObjectLink(struct Object *ob,
 void          modifiers_foreachIDLink(struct Object *ob,
 									  IDWalkFunc walk,
 									  void *userData);
+void          modifiers_foreachTexLink(struct Object *ob,
+									  TexWalkFunc walk,
+									  void *userData);
+
 struct ModifierData  *modifiers_findByType(struct Object *ob, ModifierType type);
 struct ModifierData  *modifiers_findByName(struct Object *ob, const char *name);
 void          modifiers_clearErrors(struct Object *ob);

source/blender/blenkernel/intern/modifier.c

@@ -195,6 +195,18 @@ void modifiers_foreachIDLink(Object *ob, IDWalkFunc walk, void *userData)
 	}
 }
 
+void modifiers_foreachTexLink(Object *ob, TexWalkFunc walk, void *userData)
+{
+	ModifierData *md = ob->modifiers.first;
+
+	for (; md; md=md->next) {
+		ModifierTypeInfo *mti = modifierType_getInfo(md->type);
+
+		if(mti->foreachTexLink)
+			mti->foreachTexLink(md, ob, walk, userData);
+	}
+}
+
 void modifier_copyData(ModifierData *md, ModifierData *target)
 {
 	ModifierTypeInfo *mti = modifierType_getInfo(md->type);

source/blender/modifiers/intern/MOD_armature.c

@@ -213,4 +213,5 @@ ModifierTypeInfo modifierType_Armature = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_array.c

@@ -826,4 +826,5 @@ ModifierTypeInfo modifierType_Array = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_bevel.c

@@ -150,4 +150,5 @@ ModifierTypeInfo modifierType_Bevel = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_boolean.c

@@ -197,4 +197,5 @@ ModifierTypeInfo modifierType_Boolean = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_build.c

@@ -299,5 +299,6 @@ ModifierTypeInfo modifierType_Build = {
 	/* dependsOnTime */     dependsOnTime,
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
-	/* foreachIDLink */     NULL
+	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_cast.c

@@ -632,4 +632,5 @@ ModifierTypeInfo modifierType_Cast = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_cloth.c

@@ -229,4 +229,5 @@ ModifierTypeInfo modifierType_Cloth = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     foreachIDLink,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_collision.c

@@ -267,4 +267,5 @@ ModifierTypeInfo modifierType_Collision = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_curve.c

@@ -162,4 +162,5 @@ ModifierTypeInfo modifierType_Curve = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_decimate.c

@@ -218,4 +218,5 @@ ModifierTypeInfo modifierType_Decimate = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_displace.c

@@ -134,6 +134,12 @@ static void foreachIDLink(ModifierData *md, Object *ob,
 	foreachObjectLink(md, ob, (ObjectWalkFunc)walk, userData);
 }
 
+static void foreachTexLink(ModifierData *md, Object *ob,
+					   TexWalkFunc walk, void *userData)
+{
+	walk(userData, ob, md, "texture");
+}
+
 static int isDisabled(ModifierData *md, int UNUSED(useRenderParams))
 {
 	DisplaceModifierData *dmd = (DisplaceModifierData*) md;
@@ -283,4 +289,5 @@ ModifierTypeInfo modifierType_Displace = {
 	/* dependsOnNormals */	dependsOnNormals,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     foreachIDLink,
+	/* foreachTexLink */    foreachTexLink,
 };

source/blender/modifiers/intern/MOD_edgesplit.c

@@ -1311,4 +1311,5 @@ ModifierTypeInfo modifierType_EdgeSplit = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_explode.c

@@ -1037,4 +1037,5 @@ ModifierTypeInfo modifierType_Explode = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_fluidsim.c

@@ -162,4 +162,5 @@ ModifierTypeInfo modifierType_Fluidsim = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_hook.c

@@ -289,4 +289,5 @@ ModifierTypeInfo modifierType_Hook = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_lattice.c

@@ -156,4 +156,5 @@ ModifierTypeInfo modifierType_Lattice = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_mask.c

@@ -407,4 +407,5 @@ ModifierTypeInfo modifierType_Mask = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_meshdeform.c

@@ -463,4 +463,5 @@ ModifierTypeInfo modifierType_MeshDeform = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_mirror.c

@@ -363,4 +363,5 @@ ModifierTypeInfo modifierType_Mirror = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_multires.c

@@ -131,4 +131,5 @@ ModifierTypeInfo modifierType_Multires = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_none.c

@@ -77,4 +77,5 @@ ModifierTypeInfo modifierType_None = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_particleinstance.c

@@ -350,4 +350,5 @@ ModifierTypeInfo modifierType_ParticleInstance = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_particlesystem.c

@@ -242,4 +242,5 @@ ModifierTypeInfo modifierType_ParticleSystem = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_screw.c

@@ -903,4 +903,5 @@ ModifierTypeInfo modifierType_Screw = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_shapekey.c

@@ -148,5 +148,6 @@ ModifierTypeInfo modifierType_ShapeKey = {
 	/* dependsOnTime */     NULL,
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
-	/* foreachIDLink */     NULL
+	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_shrinkwrap.c

@@ -186,4 +186,5 @@ ModifierTypeInfo modifierType_Shrinkwrap = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_simpledeform.c

@@ -385,4 +385,5 @@ ModifierTypeInfo modifierType_SimpleDeform = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_smoke.c

@@ -189,4 +189,5 @@ ModifierTypeInfo modifierType_Smoke = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     foreachIDLink,
+	/* foreachTexLink */    NULL
 };

source/blender/modifiers/intern/MOD_smooth.c

@@ -270,4 +270,5 @@ ModifierTypeInfo modifierType_Smooth = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_softbody.c

@@ -87,4 +87,5 @@ ModifierTypeInfo modifierType_Softbody = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_solidify.c

@@ -689,5 +689,6 @@ ModifierTypeInfo modifierType_Solidify = {
 	/* dependsOnTime */     NULL,
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
-	/* foreachIDLink */     NULL
+	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_subsurf.c

@@ -152,4 +152,6 @@ ModifierTypeInfo modifierType_Subsurf = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };
+

source/blender/modifiers/intern/MOD_surface.c

@@ -192,4 +192,5 @@ ModifierTypeInfo modifierType_Surface = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_uvproject.c

@@ -434,4 +434,5 @@ ModifierTypeInfo modifierType_UVProject = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     foreachIDLink,
+	/* foreachTexLink */    NULL,
 };

source/blender/modifiers/intern/MOD_warp.c

@@ -140,6 +140,11 @@ static void foreachIDLink(ModifierData *md, Object *ob, IDWalkFunc walk, void *u
 	walk(userData, ob, (ID **)&wmd->map_object);
 }
 
+static void foreachTexLink(ModifierData *md, Object *ob, TexWalkFunc walk, void *userData)
+{
+	walk(userData, ob, md, "texture");
+}
+
 static void updateDepgraph(ModifierData *md, DagForest *forest, struct Scene *UNUSED(scene),
                            Object *UNUSED(ob), DagNode *obNode)
 {
@@ -364,4 +369,5 @@ ModifierTypeInfo modifierType_Warp = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     foreachIDLink,
+	/* foreachTexLink */    foreachTexLink,
 };

source/blender/modifiers/intern/MOD_wave.c

@@ -126,6 +126,12 @@ static void foreachIDLink(ModifierData *md, Object *ob,
 	foreachObjectLink(md, ob, (ObjectWalkFunc)walk, userData);
 }
 
+static void foreachTexLink(ModifierData *md, Object *ob,
+					   TexWalkFunc walk, void *userData)
+{
+	walk(userData, ob, md, "texture");
+}
+
 static void updateDepgraph(ModifierData *md, DagForest *forest,
 						Scene *UNUSED(scene),
 						Object *UNUSED(ob),
@@ -466,4 +472,5 @@ ModifierTypeInfo modifierType_Wave = {
 	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ foreachObjectLink,
 	/* foreachIDLink */     foreachIDLink,
+	/* foreachTexLink */    foreachTexLink,
 };