Fix T86060: Texture Paint clone tool misleading texture UI

For projection painting tools besides the `DRAW` tool:

- Don't show the texture from viewport stencil drawing.
- Don't show the texture panel.

Based on D10564 by @lichtwerk with own changes.

2 files changed, 21 insertions, 6 deletions

diff --git a/release/scripts/startup/bl_ui/space_view3d_toolbar.py b/release/scripts/startup/bl_ui/space_view3d_toolbar.py
index 72baa5331bf..831fc06eda5 100644
--- a/release/scripts/startup/bl_ui/space_view3d_toolbar.py
+++ b/release/scripts/startup/bl_ui/space_view3d_toolbar.py
@@ -622,9 +622,15 @@ class VIEW3D_PT_tools_brush_texture(Panel, View3DPaintPanel):
 
     @classmethod
     def poll(cls, context):
-        settings = cls.paint_settings(context)
-        return (settings and settings.brush and
-                (context.sculpt_object or context.image_paint_object or context.vertex_paint_object))
+        if (
+                (settings := cls.paint_settings(context)) and
+                (brush := settings.brush)
+        ):
+            if context.sculpt_object or context.vertex_paint_object:
+                return True
+            elif context.image_paint_object:
+                return (brush.image_tool == 'DRAW')
+        return False
 
     def draw(self, context):
         layout = self.layout
diff --git a/source/blender/editors/sculpt_paint/paint_cursor.c b/source/blender/editors/sculpt_paint/paint_cursor.c
index b44f2f66d92..c5e7b2dc4d3 100644
--- a/source/blender/editors/sculpt_paint/paint_cursor.c
+++ b/source/blender/editors/sculpt_paint/paint_cursor.c
@@ -545,6 +545,7 @@ static bool paint_draw_tex_overlay(UnifiedPaintSettings *ups,
                                    int x,
                                    int y,
                                    float zoom,
+                                   const ePaintMode mode,
                                    bool col,
                                    bool primary)
 {
@@ -556,6 +557,13 @@ static bool paint_draw_tex_overlay(UnifiedPaintSettings *ups,
                             (brush->overlay_flags & BRUSH_OVERLAY_SECONDARY) != 0);
   int overlay_alpha = (primary) ? brush->texture_overlay_alpha : brush->mask_overlay_alpha;
 
+  if (mode == PAINT_MODE_TEXTURE_3D) {
+    if (primary && brush->imagepaint_tool == PAINT_TOOL_DRAW) {
+      /* All non-draw tools don't use the primary texture (clone, smear, soften.. etc). */
+      return false;
+    }
+  }
+
   if (!(mtex->tex) ||
       !((mtex->brush_map_mode == MTEX_MAP_MODE_STENCIL) ||
         (valid && ELEM(mtex->brush_map_mode, MTEX_MAP_MODE_VIEW, MTEX_MAP_MODE_TILED)))) {
@@ -785,10 +793,11 @@ static bool paint_draw_alpha_overlay(UnifiedPaintSettings *ups,
   /* Colored overlay should be drawn separately. */
   if (col) {
     if (!(flags & PAINT_OVERLAY_OVERRIDE_PRIMARY)) {
-      alpha_overlay_active = paint_draw_tex_overlay(ups, brush, vc, x, y, zoom, true, true);
+      alpha_overlay_active = paint_draw_tex_overlay(ups, brush, vc, x, y, zoom, mode, true, true);
     }
     if (!(flags & PAINT_OVERLAY_OVERRIDE_SECONDARY)) {
-      alpha_overlay_active = paint_draw_tex_overlay(ups, brush, vc, x, y, zoom, false, false);
+      alpha_overlay_active = paint_draw_tex_overlay(
+          ups, brush, vc, x, y, zoom, mode, false, false);
     }
     if (!(flags & PAINT_OVERLAY_OVERRIDE_CURSOR)) {
       alpha_overlay_active = paint_draw_cursor_overlay(ups, brush, vc, x, y, zoom);
@@ -796,7 +805,7 @@ static bool paint_draw_alpha_overlay(UnifiedPaintSettings *ups,
   }
   else {
     if (!(flags & PAINT_OVERLAY_OVERRIDE_PRIMARY) && (mode != PAINT_MODE_WEIGHT)) {
-      alpha_overlay_active = paint_draw_tex_overlay(ups, brush, vc, x, y, zoom, false, true);
+      alpha_overlay_active = paint_draw_tex_overlay(ups, brush, vc, x, y, zoom, mode, false, true);
     }
     if (!(flags & PAINT_OVERLAY_OVERRIDE_CURSOR)) {
       alpha_overlay_active = paint_draw_cursor_overlay(ups, brush, vc, x, y, zoom);