Disable RHI Renderer by default

RHI renderer use ShaderTools which is GPL licensed. This patch
disables the plugin by default until Qt3D provides a suitable
replacement for the dependency.

To enable the RHI backend, compile Qt3D and pass parameter
-DFEATURE_qt3d_rhi_renderer=ON to cmake.

Unfortunate side effect of RHI backend being disabled is that
when using Scene3D, the QtQuick renderer must be configured to
use the opengl backend.

[ChangeLog] RHI Backend is not longer built by default

Task-number: QTBUG-94960
Change-Id: I0bff7523e159b800734b58bfef37e5088d0a0d41
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>
(cherry picked from commit 3964b273459c2999f33d51b96afe6fb68f07d52f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 6 insertions, 0 deletions

diff --git a/examples/qt3d/controlsunderlay/CMakeLists.txt b/examples/qt3d/controlsunderlay/CMakeLists.txt
index 1b65bc755..4bd5f086e 100644
--- a/examples/qt3d/controlsunderlay/CMakeLists.txt
+++ b/examples/qt3d/controlsunderlay/CMakeLists.txt
@@ -19,6 +19,7 @@ find_package(Qt6 COMPONENTS Core)
 find_package(Qt6 COMPONENTS Gui)
 find_package(Qt6 COMPONENTS Qml)
 find_package(Qt6 COMPONENTS Quick)
+find_package(Qt6 COMPONENTS 3DRender)
 
 qt_add_executable(controlsunderlay
     main.cpp
@@ -32,6 +33,7 @@ target_link_libraries(controlsunderlay PUBLIC
     Qt::Gui
     Qt::Qml
     Qt::Quick
+    Qt::3DRender
 )
 
 
diff --git a/examples/qt3d/controlsunderlay/main.cpp b/examples/qt3d/controlsunderlay/main.cpp
index cb3928a51..a19464911 100644
--- a/examples/qt3d/controlsunderlay/main.cpp
+++ b/examples/qt3d/controlsunderlay/main.cpp
@@ -50,12 +50,16 @@
 
 #include <QGuiApplication>
 #include <QQuickView>
+#include <Qt3DRender/qt3drender-config.h>
 
 int main(int argc, char **argv)
 {
     QSurfaceFormat format;
     format.setSamples(4);
     QSurfaceFormat::setDefaultFormat(format);
+#if !QT_CONFIG(qt3d_rhi_renderer)
+    qputenv("QSG_RHI_BACKEND", "opengl");
+#endif
 
     QGuiApplication app(argc, argv);