Fix subpresentations in custom shaders

Custom shaders don't have presentationIds separately. The property value
has to be interpreted as a presentationId. The main layer also has to be
set dirty if custom shader subpresentation changes so that it animates
even without other changes in the scene.

Task-number: QT3DS-4083
Change-Id: I0fef13a8c7d99a74c524e459bb5490ff48158e26
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/runtimerender/Qt3DSRenderEffectSystem.cpp b/src/runtimerender/Qt3DSRenderEffectSystem.cpp
index b10345c..faaf4d2 100644
--- a/src/runtimerender/Qt3DSRenderEffectSystem.cpp
+++ b/src/runtimerender/Qt3DSRenderEffectSystem.cpp
@@ -1082,9 +1082,10 @@ struct SEffectSystem : public IEffectSystem
                                 image->m_ImagePath = *theStrPtr;
                                 image->m_Flags.SetDirty(true);
                             } else {
-                                if (image->m_OffscreenRendererId.IsValid()) {
-                                    IOffscreenRenderManager &theOffscreenRenderer(
-                                                            m_Context->GetOffscreenRenderManager());
+                                IOffscreenRenderManager &theOffscreenRenderer(
+                                                        m_Context->GetOffscreenRenderManager());
+                                if (image->m_OffscreenRendererId.IsValid()
+                                        || theOffscreenRenderer.HasOffscreenRenderer(*theStrPtr)) {
                                     SOffscreenRenderResult theResult
                                             = theOffscreenRenderer.GetRenderedItem(*theStrPtr);
                                     needsAlphaMultiply = false;