Remove the old shader result if compilation fails

If shader is changed and compilation fails, remove the old result from
shader cache.

Task-id: QT3DS-4065
Change-Id: Ie5d13c0b3649dfb65f8053ff9d76b34c80ba9bcd
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/runtimerender/Qt3DSRenderCustomMaterialSystem.cpp b/src/runtimerender/Qt3DSRenderCustomMaterialSystem.cpp
index 5f54b4c..cb94534 100644
--- a/src/runtimerender/Qt3DSRenderCustomMaterialSystem.cpp
+++ b/src/runtimerender/Qt3DSRenderCustomMaterialSystem.cpp
@@ -1266,6 +1266,9 @@ struct SMaterialSystem : public ICustomMaterialSystem
             if (theProgram) {
                 theInsertResult.first->second =
                     QT3DS_NEW(m_Allocator, SCustomMaterialShader)(*theProgram, theFlags);
+            } else {
+                // If a changed shader fails to compile, clean away the old result from cache
+                theInsertResult.first->second = NULL;
             }
         } else if (theInsertResult.first->second)
             theProgram = theInsertResult.first->second->m_Shader;