From 972f839cada24ac7d4870e3d04713e9089d8dc29 Mon Sep 17 00:00:00 2001
From: Uwe Rathmann <Uwe.Rathmann@tigertal.de>
Date: Fri, 22 Dec 2023 13:52:01 +0100
Subject: [PATCH] Qt5 implementation of QskSceneTexture

---
 src/CMakeLists.txt                        |   7 +-
 src/controls/QskQuick.cpp                 |   8 +
 src/controls/QskQuick.h                   |   6 +-
 src/nodes/QskBoxNode.cpp                  |   8 +-
 src/nodes/QskGradientMaterial.cpp         |   2 +-
 src/nodes/QskSceneTexture.cpp             | 256 +++++++++++++++++-----
 src/nodes/QskSceneTexture.h               |  15 +-
 src/nodes/QskTextureRenderer.cpp          |   4 +-
 src/nodes/shaders/boxshadow.frag.qsb      | Bin 2639 -> 2656 bytes
 src/nodes/shaders/boxshadow.vert.qsb      | Bin 1552 -> 1559 bytes
 src/nodes/shaders/crisplines.frag.qsb     | Bin 871 -> 872 bytes
 src/nodes/shaders/crisplines.vert.qsb     | Bin 1865 -> 1871 bytes
 src/nodes/shaders/gradientconic.frag.qsb  | Bin 1830 -> 1826 bytes
 src/nodes/shaders/gradientconic.vert.qsb  | Bin 1617 -> 1624 bytes
 src/nodes/shaders/gradientlinear.frag.qsb | Bin 1424 -> 1444 bytes
 src/nodes/shaders/gradientlinear.vert.qsb | Bin 1592 -> 1582 bytes
 src/nodes/shaders/gradientradial.frag.qsb | Bin 1526 -> 1550 bytes
 src/nodes/shaders/gradientradial.vert.qsb | Bin 1472 -> 1479 bytes
 src/nodes/shaders/vulkan2qsb.sh           |   1 +
 19 files changed, 238 insertions(+), 69 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 43feec2c..3906ad94 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -120,6 +120,7 @@ list(APPEND HEADERS
     nodes/QskPaintedNode.h
     nodes/QskPlainTextRenderer.h
     nodes/QskRichTextRenderer.h
+    nodes/QskSceneTexture.h
     nodes/QskSGNode.h
     nodes/QskStrokeNode.h
     nodes/QskStippledLineRenderer.h
@@ -157,6 +158,7 @@ list(APPEND SOURCES
     nodes/QskPlainTextRenderer.cpp
     nodes/QskRectangleNode.cpp
     nodes/QskRichTextRenderer.cpp
+    nodes/QskSceneTexture.cpp
     nodes/QskSGNode.cpp
     nodes/QskStrokeNode.cpp
     nodes/QskStippledLineRenderer.cpp
@@ -169,11 +171,6 @@ list(APPEND SOURCES
     nodes/QskVertex.cpp
 )
 
-if (QT_VERSION_MAJOR VERSION_GREATER 5)
-    list(APPEND HEADERS nodes/QskSceneTexture.h)
-    list(APPEND SOURCES nodes/QskSceneTexture.cpp)
-endif()
-
 qt_add_resources(SOURCES nodes/shaders.qrc)
 
 list(APPEND HEADERS
diff --git a/src/controls/QskQuick.cpp b/src/controls/QskQuick.cpp
index 7760e916..9d223a36 100644
--- a/src/controls/QskQuick.cpp
+++ b/src/controls/QskQuick.cpp
@@ -19,6 +19,14 @@ QSK_QT_PRIVATE_END
 #include <qpa/qplatforminputcontext.h>
 #include <qpa/qplatformintegration.h>
 
+QRhi* qskRenderingHardwareInterface( const QQuickWindow* window )
+{
+    if ( auto w = const_cast< QQuickWindow* >( window ) )
+        return QQuickWindowPrivate::get( w )->rhi;
+
+    return nullptr;
+}
+
 QRectF qskItemRect( const QQuickItem* item )
 {
     auto d = QQuickItemPrivate::get( item );
diff --git a/src/controls/QskQuick.h b/src/controls/QskQuick.h
index 622b108d..c8afaafd 100644
--- a/src/controls/QskQuick.h
+++ b/src/controls/QskQuick.h
@@ -18,14 +18,16 @@ class QSGNode;
 class QSGTransformNode;
 class QSGRootNode;
 class QRectF;
+class QRhi;
 
 template< typename T > class QList;
 
 /*
-    Exporting methods from QQuickItemPrivate, that should be part
-    of QQuickItem.
+    Exporting useful methods from QQuickItemPrivate/QQuickWindowPrivate
  */
 
+QSK_EXPORT QRhi* qskRenderingHardwareInterface( const QQuickWindow* );
+
 QSK_EXPORT bool qskIsItemInDestructor( const QQuickItem* );
 QSK_EXPORT bool qskIsItemComplete( const QQuickItem* );
 QSK_EXPORT bool qskIsAncestorOf( const QQuickItem* item, const QQuickItem* child );
diff --git a/src/nodes/QskBoxNode.cpp b/src/nodes/QskBoxNode.cpp
index 58329d1b..4de2242c 100644
--- a/src/nodes/QskBoxNode.cpp
+++ b/src/nodes/QskBoxNode.cpp
@@ -78,11 +78,9 @@ void QskBoxNode::updateNode( const QRectF& rect,
     }
 
     /*
-        QskBoxRectangleNode supports vertical/horizontal and many tilted
-        linear gradients.  If our gradient doesn't fall into this category
-        we use a QskBoxFillNode.
-
-        However the border is always done with a QskBoxRectangleNode
+        QskBoxRectangleNode is more efficient and creates batchable geometries.
+        So we prefer using it where possible.
+        Note, that the border is always done with a QskBoxRectangleNode
      */
 
     if ( QskBoxRenderer::isGradientSupported( shape, gradient ) )
diff --git a/src/nodes/QskGradientMaterial.cpp b/src/nodes/QskGradientMaterial.cpp
index 7be7d994..29771012 100644
--- a/src/nodes/QskGradientMaterial.cpp
+++ b/src/nodes/QskGradientMaterial.cpp
@@ -22,7 +22,7 @@
 #endif
 
 #if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
-    #include <QSGMaterialRhiShader>
+    #include <qsgmaterialrhishader.h>
     using RhiShader = QSGMaterialRhiShader;
 #else
     using RhiShader = QSGMaterialShader;
diff --git a/src/nodes/QskSceneTexture.cpp b/src/nodes/QskSceneTexture.cpp
index 8660fdcb..9fa8af44 100644
--- a/src/nodes/QskSceneTexture.cpp
+++ b/src/nodes/QskSceneTexture.cpp
@@ -10,11 +10,28 @@
 
 QSK_QT_PRIVATE_BEGIN
 #include <private/qquickwindow_p.h>
+#include <private/qsgtexture_p.h>
+
+#define QT_BUILD_QUICK_LIB // suppress Qt5 warnings
 #include <private/qsgbatchrenderer_p.h>
+#undef QT_BUILD_QUICK_LIB
+
 QSK_QT_PRIVATE_END
 
+/*
+    With Qt 5.15 Rhi can optionally be enbled by setting "export QSG_RHI=1".
+    So we need to have a native QOpenGL implementation and one using
+    the Rhi abstraction layer. For Qt6 we can rely on Rhi.
+    Once Qt5 support has been dropped we can eliminate this #ifdef jungle
+ */
+
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+#include <qopenglframebufferobject.h>
+#endif
+
 namespace
 {
+#if QT_VERSION >= QT_VERSION_CHECK( 6, 0, 0 )
     inline QSGRendererInterface::RenderMode contextRenderMode(
         QSGDefaultRenderContext* context )
     {
@@ -22,6 +39,7 @@ namespace
             ? QSGRendererInterface::RenderMode2D
             : QSGRendererInterface::RenderMode2DNoDepthBuffer;
     }
+#endif
 
     class Renderer final : public QSGBatchRenderer::Renderer
     {
@@ -31,8 +49,16 @@ namespace
         Renderer( QskSceneTexture*, QSGDefaultRenderContext* );
         ~Renderer() override;
 
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+        inline int textureId() const { return m_fbo ? m_fbo->texture() : 0; }
+        inline void renderScene() { Inherited::renderScene( textureId() ); }
+#endif
+
+        inline QRhiTexture* rhiTexture() const { return m_rhiTexture; }
+
+        inline bool isDirty() const { return m_dirty; }
+
         void setFinalNode( QSGTransformNode* );
-        QRhiTexture* texture() const { return m_rhiTexture; }
 
         void setProjection( const QRectF& );
         void setTextureSize( const QSize& );
@@ -45,15 +71,30 @@ namespace
         void createTarget( const QSize& );
         void clearTarget();
 
-      private:
-        QRhiTexture* m_rhiTexture = nullptr;
         QSGTransformNode* m_finalNode = nullptr;
-
         QskSceneTexture* m_texture = nullptr;
+
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+        QOpenGLFramebufferObject* m_fbo;
+
+        struct RenderTarget
+        {
+            QRhiRenderTarget* rt = nullptr;
+            QRhiRenderPassDescriptor* rpDesc = nullptr;
+            QRhiCommandBuffer* cb = nullptr;
+        } m_rt;
+#endif
+        QRhiTexture* m_rhiTexture = nullptr;
+
+        bool m_dirty = true;
     };
 
     Renderer::Renderer( QskSceneTexture* texture, QSGDefaultRenderContext* context )
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+        : Inherited( context )
+#else
         : Inherited( context, contextRenderMode( context ) )
+#endif
         , m_texture( texture )
     {
         setClearColor( Qt::transparent );
@@ -74,11 +115,18 @@ namespace
 
     void Renderer::setProjection( const QRectF& rect )
     {
-        const auto rhi = context()->rhi();
+        bool flipFramebuffer = true;
+        bool flipMatrix = false;
+
+        if ( const auto rhi = context()->rhi() )
+        {
+            flipFramebuffer = rhi->isYUpInFramebuffer();
+            flipMatrix = !rhi->isYUpInNDC();
+        }
 
         auto r = rect;
 
-        if ( rhi->isYUpInFramebuffer() )
+        if ( flipFramebuffer )
         {
             r.moveTop( r.bottom() );
             r.setHeight( -r.height() );
@@ -86,7 +134,7 @@ namespace
 
         MatrixTransformFlags matrixFlags;
 
-        if ( !rhi->isYUpInNDC() )
+        if ( flipMatrix )
             matrixFlags |= QSGAbstractRenderer::MatrixTransformFlipY;
 
         setProjectionMatrixToRect( r, matrixFlags );
@@ -94,11 +142,24 @@ namespace
 
     void Renderer::setTextureSize( const QSize& size )
     {
-        if ( m_rt.rt && m_rt.rt->pixelSize() != size )
-            clearTarget();
+        if ( const auto rhi = context()->rhi() )
+        {
+            if ( m_rt.rt && m_rt.rt->pixelSize() != size )
+                clearTarget();
 
-        if ( m_rt.rt == nullptr )
-            createTarget( size );
+            if ( m_rt.rt == nullptr )
+                createTarget( size );
+        }
+        else
+        {
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+            if ( m_fbo && m_fbo->size() != size )
+                clearTarget();
+
+            if ( m_fbo == nullptr )
+                createTarget( size );
+#endif
+        }
 
         const QRect r( 0, 0, size.width(), size.height() );
 
@@ -108,8 +169,13 @@ namespace
 
     void Renderer::render()
     {
+        m_dirty = false;
+
         qskTryBlockTrailingNodes( m_finalNode, rootNode(), true, false );
+
 #if 0
+        static int counter = 0;
+        qDebug() << ++counter;
         QSGNodeDumper::dump( rootNode() );
 #endif
         Inherited::render();
@@ -118,51 +184,92 @@ namespace
 
     void Renderer::nodeChanged( QSGNode* node, QSGNode::DirtyState state )
     {
-        // do not forward nodes that are blocked while rendering
+        Inherited::nodeChanged( node, state );
 
-        const bool isTrailingNode = false; // TODO ...
+        /*
+            We want to limit updates to nodes, that are actually rendered. TODO ...
 
-        if ( !isTrailingNode )
+            In any case we need to block update requests, when the textureNode reports
+            that it has been updated by us to the renderer of the window.
+         */
+        if ( ( state != QSGNode::DirtyMaterial )
+            || ( node != m_texture->textureNode() ) )
         {
-            Inherited::nodeChanged( node, state );
+            m_dirty = true;
             Q_EMIT m_texture->updateRequested();
         }
     }
 
     void Renderer::createTarget( const QSize& size )
     {
-        const auto rhi = context()->rhi();
+        if ( const auto rhi = context()->rhi() )
+        {
+            auto flags = QRhiTexture::RenderTarget | QRhiTexture::UsedAsTransferSource;
 
-        auto flags = QRhiTexture::RenderTarget | QRhiTexture::UsedAsTransferSource;
+            m_rhiTexture = rhi->newTexture( QRhiTexture::RGBA8, size, 1, flags );
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+            m_rhiTexture->build();
+#else
+            m_rhiTexture->create();
+#endif
 
-        m_rhiTexture = rhi->newTexture( QRhiTexture::RGBA8, size, 1, flags );
-        m_rhiTexture->create();
+            QRhiColorAttachment color0( m_rhiTexture );
+            auto target = rhi->newTextureRenderTarget( { color0 } );
 
-        QRhiColorAttachment color0( m_rhiTexture );
-        auto target = rhi->newTextureRenderTarget( { color0 } );
+            target->setRenderPassDescriptor(
+                target->newCompatibleRenderPassDescriptor() );
 
-        target->setRenderPassDescriptor(
-            target->newCompatibleRenderPassDescriptor() );
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+            target->build();
+#else
+            target->create();
+#endif
 
-        target->create();
+            m_rt.rt = target;
+            m_rt.rpDesc = target->renderPassDescriptor();
 
-        m_rt.rt = target;
-        m_rt.rpDesc = target->renderPassDescriptor();
+            auto defaultContext = qobject_cast< QSGDefaultRenderContext* >( context() );
+            m_rt.cb = defaultContext->currentFrameCommandBuffer();
 
-        auto defaultContext = qobject_cast< QSGDefaultRenderContext* >( context() );
-        m_rt.cb = defaultContext->currentFrameCommandBuffer();
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+            setRenderTarget( m_rt.rt );
+            setCommandBuffer( m_rt.cb );
+            setRenderPassDescriptor( m_rt.rpDesc );
+#endif
+        }
+        else
+        {
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+            QOpenGLFramebufferObjectFormat format;
+            format.setInternalTextureFormat( GL_RGBA8 );
+            format.setSamples( 0 );
+            format.setAttachment( QOpenGLFramebufferObject::CombinedDepthStencil );
+
+            m_fbo = new QOpenGLFramebufferObject( size, format );
+#endif
+        }
     }
 
     void Renderer::clearTarget()
     {
-        delete m_rt.rt;
-        m_rt.rt = nullptr;
+        if ( const auto rhi = context()->rhi() )
+        {
+            delete m_rt.rt;
+            m_rt.rt = nullptr;
 
-        delete m_rt.rpDesc;
-        m_rt.rpDesc = nullptr;
+            delete m_rt.rpDesc;
+            m_rt.rpDesc = nullptr;
 
-        delete m_rhiTexture;
-        m_rhiTexture = nullptr;
+            delete m_rhiTexture;
+            m_rhiTexture = nullptr;
+        }
+        else
+        {
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+            delete m_fbo;
+            m_fbo = nullptr;
+#endif
+        }
     }
 }
 
@@ -170,22 +277,39 @@ class QskSceneTexturePrivate final : public QSGTexturePrivate
 {
   public:
     QskSceneTexturePrivate( const QQuickWindow* window, QskSceneTexture* texture )
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+        : QSGTexturePrivate()
+#else
         : QSGTexturePrivate( texture )
+#endif
         , devicePixelRatio( window->effectiveDevicePixelRatio() )
     {
-        context = dynamic_cast< QSGDefaultRenderContext* >(
-            QQuickWindowPrivate::get( window )->context );
+        Q_UNUSED( texture );
+
+        // Qt5 needs the extra const_cast
+        auto dw = QQuickWindowPrivate::get( const_cast< QQuickWindow* >( window ) );
+        context = dynamic_cast< QSGDefaultRenderContext* >( dw->context );
     }
 
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+    int comparisonKey() const override
+        { return int( qintptr( rhiTexture() ) ); }
+
+    QRhiTexture *rhiTexture() const override
+        { return renderer ? renderer->rhiTexture() : nullptr; }
+#endif
+
     QRectF rect;
     const qreal devicePixelRatio;
 
     Renderer* renderer = nullptr;
     QSGDefaultRenderContext* context = nullptr;
+
+    const QSGGeometryNode* textureNode = nullptr;
 };
 
 QskSceneTexture::QskSceneTexture( const QQuickWindow* window )
-    : Inherited(*( new QskSceneTexturePrivate( window, this ) ) )
+    : Inherited( *new QskSceneTexturePrivate( window, this ) )
 {
     Q_ASSERT( d_func()->context );
 }
@@ -195,6 +319,16 @@ QskSceneTexture::~QskSceneTexture()
     delete d_func()->renderer;
 }
 
+void QskSceneTexture::setTextureNode( const QSGGeometryNode* node )
+{
+    d_func()->textureNode = node;
+}
+
+const QSGGeometryNode* QskSceneTexture::textureNode() const
+{
+    return d_func()->textureNode;
+}
+
 QSize QskSceneTexture::textureSize() const
 {
     Q_D( const QskSceneTexture );
@@ -213,17 +347,6 @@ QSize QskSceneTexture::textureSize() const
     return size;
 }
 
-qint64 QskSceneTexture::comparisonKey() const
-{
-    return qint64( rhiTexture() );
-}
-
-QRhiTexture* QskSceneTexture::rhiTexture() const
-{
-    Q_D( const QskSceneTexture );
-    return d->renderer ? d->renderer->texture() : nullptr;
-}
-
 void QskSceneTexture::render( const QSGRootNode* rootNode,
     const QSGTransformNode* finalNode, const QRectF& rect )
 {
@@ -231,8 +354,6 @@ void QskSceneTexture::render( const QSGRootNode* rootNode,
 
     d->rect = rect;
 
-    const auto pixelSize = textureSize();
-
     if ( d->renderer == nullptr )
     {
         d->renderer = new Renderer( this, d->context );
@@ -243,7 +364,7 @@ void QskSceneTexture::render( const QSGRootNode* rootNode,
     d->renderer->setFinalNode( const_cast< QSGTransformNode* >( finalNode ) );
 
     d->renderer->setProjection( d->rect );
-    d->renderer->setTextureSize( pixelSize );
+    d->renderer->setTextureSize( textureSize() );
     d->renderer->renderScene();
 }
 
@@ -262,9 +383,38 @@ bool QskSceneTexture::hasMipmaps() const
     return false;
 }
 
-void QskSceneTexture::commitTextureOperations( QRhi*, QRhiResourceUpdateBatch* )
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+
+void QskSceneTexture::bind()
 {
-    // what to do here ?
+    if ( d_func()->rhiTexture() == nullptr )
+    {
+        auto funcs = QOpenGLContext::currentContext()->functions();
+        funcs->glBindTexture( GL_TEXTURE_2D, textureId() );
+
+        updateBindOptions();
+    }
 }
 
+int QskSceneTexture::textureId() const
+{
+    Q_D( const QskSceneTexture );
+    return d->renderer ? d->renderer->textureId() : 0;
+}
+
+#else
+
+qint64 QskSceneTexture::comparisonKey() const
+{
+    return qint64( rhiTexture() );
+}
+
+QRhiTexture* QskSceneTexture::rhiTexture() const
+{
+    Q_D( const QskSceneTexture );
+    return d->renderer ? d->renderer->rhiTexture() : nullptr;
+}
+
+#endif
+
 #include "moc_QskSceneTexture.cpp"
diff --git a/src/nodes/QskSceneTexture.h b/src/nodes/QskSceneTexture.h
index 1a66f931..56acdb3e 100644
--- a/src/nodes/QskSceneTexture.h
+++ b/src/nodes/QskSceneTexture.h
@@ -13,6 +13,7 @@ class QskSceneTexturePrivate;
 
 class QSGRootNode;
 class QSGTransformNode;
+class QSGGeometryNode;
 class QQuickWindow;
 
 class QSK_EXPORT QskSceneTexture : public QSGTexture
@@ -25,19 +26,31 @@ class QSK_EXPORT QskSceneTexture : public QSGTexture
     QskSceneTexture( const QQuickWindow* );
     ~QskSceneTexture();
 
+#if 1
+    // to avoid recursive update - need to find a better solution TODO
+    void setTextureNode( const QSGGeometryNode* );
+    const QSGGeometryNode* textureNode() const;
+#endif
+
     void render( const QSGRootNode*, const QSGTransformNode*, const QRectF& );
 
     QSize textureSize() const override;
 
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+    void bind() override;
+    int textureId() const override;
+#else
     qint64 comparisonKey() const override;
     QRhiTexture* rhiTexture() const override;
+#endif
 
     QRectF normalizedTextureSubRect() const override;
 
     // satisfy the QSGTexture API
     bool hasAlphaChannel() const override;
     bool hasMipmaps() const override;
-    void commitTextureOperations( QRhi*, QRhiResourceUpdateBatch* ) override;
+
+    bool isDirty() const;
 
   Q_SIGNALS:
     void updateRequested();
diff --git a/src/nodes/QskTextureRenderer.cpp b/src/nodes/QskTextureRenderer.cpp
index d7279b90..4d545736 100644
--- a/src/nodes/QskTextureRenderer.cpp
+++ b/src/nodes/QskTextureRenderer.cpp
@@ -4,6 +4,7 @@
  *****************************************************************************/
 
 #include "QskTextureRenderer.h"
+#include "QskQuick.h"
 
 #include <qopenglcontext.h>
 #include <qopenglframebufferobject.h>
@@ -17,7 +18,6 @@
 QSK_QT_PRIVATE_BEGIN
 #include <private/qsgplaintexture_p.h>
 #include <private/qopenglframebufferobject_p.h>
-#include <private/qquickwindow_p.h>
 QSK_QT_PRIVATE_END
 
 #if QT_VERSION >= QT_VERSION_CHECK( 6, 0, 0 )
@@ -89,7 +89,7 @@ void QskTextureRenderer::setTextureId( QQuickWindow* window,
     if ( plainTexture == nullptr )
         return;
 
-    auto rhi = QQuickWindowPrivate::get( window )->rhi;
+    auto rhi = qskRenderingHardwareInterface( window );
 
 #if QT_VERSION >= QT_VERSION_CHECK( 6, 4, 0 )
 
diff --git a/src/nodes/shaders/boxshadow.frag.qsb b/src/nodes/shaders/boxshadow.frag.qsb
index 9a7990780c64b70fef57497c0cc5678079420cf5..8ecfc828aa472382eb72816fe916e075d05238ff 100644
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diff --git a/src/nodes/shaders/gradientconic.vert.qsb b/src/nodes/shaders/gradientconic.vert.qsb
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diff --git a/src/nodes/shaders/gradientlinear.frag.qsb b/src/nodes/shaders/gradientlinear.frag.qsb
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diff --git a/src/nodes/shaders/gradientradial.vert.qsb b/src/nodes/shaders/gradientradial.vert.qsb
index c81c721db05850bff2fe1b2fc65b8167f4cb9582..b530364f68a2e9ebd650e4f25df4534996a192b6 100644
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diff --git a/src/nodes/shaders/vulkan2qsb.sh b/src/nodes/shaders/vulkan2qsb.sh
index 22e28e10..765f5127 100755
--- a/src/nodes/shaders/vulkan2qsb.sh
+++ b/src/nodes/shaders/vulkan2qsb.sh
@@ -3,6 +3,7 @@
 function qsbcompile {
     qsbfile=`echo $1 | sed 's/-vulkan//'`
     qsb --glsl 100es,120,150 --hlsl 50 --msl 12 -b -o ${qsbfile}.qsb $1
+    # qsb --qt6 -b -o ${qsbfile}.qsb $1
 } 
 
 qsbcompile boxshadow-vulkan.vert