Lazy load custom material subpresentations

Search through custom material string properties for subpresentation
ids.

Task-number: QT3DS-4090
Change-Id: Ia6a7227a9b9c5eb069f5670e7188644bf212ae8c
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/engine/Qt3DSRenderRuntimeBinding.cpp b/src/engine/Qt3DSRenderRuntimeBinding.cpp
index 7535af6..3d7dac8 100644
--- a/src/engine/Qt3DSRenderRuntimeBinding.cpp
+++ b/src/engine/Qt3DSRenderRuntimeBinding.cpp
@@ -254,6 +254,24 @@ struct Qt3DSRenderScene : public Q3DStudio::IScene
                 Q3DStudio::UVariant value;
                 if (theElement.GetAttribute(ATTRIBUTE_SUBPRESENTATION, value))
                     subs.push_back(m_Context->GetStringTable().HandleToStr(value.m_StringHandle));
+            } else if (theTranslator && theTranslator->GetUIPType()
+                       == GraphObjectTypes::CustomMaterial) {
+                // Add custom material strings to the subpresentation list since any string
+                // property could be a texture with a subpresentation source.
+                // Non-subpresentation strings are filtered out by the function caller.
+                int numProperties = theElement.GetNumProperties();
+                for (int i = 0; i < numProperties; ++i) {
+                    auto property = theElement.GetPropertyByIndex(i);
+                    if (property.hasValue()) {
+                        auto value = property.getValue();
+                        if (value.first.type() == ATTRIBUTETYPE_STRING) {
+                            auto stringValue = m_Context->GetStringTable().HandleToStr(
+                                        value.second->m_StringHandle);
+                            if (stringValue.IsValid())
+                                subs.push_back(stringValue);
+                        }
+                    }
+                }
             }
         }
     }