Add a new transform mode for ShaderData properties

Sometimes you just want to transform the direction of the vector and not
translate it. So add a specific ModelToWorldDirection mode going through
a QVector4D to do this properly.

Change-Id: I7292aff6abf2aa3a154a5bec90b6d7da6ea0d595
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/render/materialsystem/shaderdata.cpp b/src/render/materialsystem/shaderdata.cpp
index 01eceb696..6de0047a3 100644
--- a/src/render/materialsystem/shaderdata.cpp
+++ b/src/render/materialsystem/shaderdata.cpp
@@ -251,6 +251,11 @@ bool ShaderData::updateWorldTransform(const QMatrix4x4 &worldMatrix)
             if (transformedIt.value() == ModelToEye) {
                 m_updatedProperties.insert(transformedIt.key(), m_viewMatrix * m_worldMatrix * m_originalProperties.value(transformedIt.key()).value<QVector3D>());
                 m_properties.insert(transformedIt.key(), m_viewMatrix * m_worldMatrix * m_originalProperties.value(transformedIt.key()).value<QVector3D>());
+            } else if (transformedIt.value() == ModelToWorldDirection) {
+                auto localDirection = QVector4D(m_originalProperties.value(transformedIt.key()).value<QVector3D>(), 0.0f);
+                auto worldDirection = (m_worldMatrix * localDirection).toVector3D();
+                m_updatedProperties.insert(transformedIt.key(), worldDirection);
+                m_properties.insert(transformedIt.key(), worldDirection);
             } else {
                 m_updatedProperties.insert(transformedIt.key(), m_worldMatrix * m_originalProperties.value(transformedIt.key()).value<QVector3D>());
                 m_properties.insert(transformedIt.key(), m_worldMatrix * m_originalProperties.value(transformedIt.key()).value<QVector3D>());