Tracing/QmlProfiler: Port shaders to Qt 6

For each shader in Tracing and QmlProfiler:
- Add a vert/frag variant in Vulkan style GLSL
- Include the shader via qt_add_shaders
- Implement RHI/Qt6-specific code for loading the shaders and for
  updating the uniform buffer
- Set the material's QSGMaterial::CustomCompileStep flag to affect the z
  value the same way as the Qt 5 code does

Building of Tracing, QmlProfiler, etc. with Qt 6 depends on the Qt
Shader tools being installed.

Fixes: QTCREATORBUG-20575
Change-Id: I9aba5a777da9a549da0cdd0a217dfcb346c72e58
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

12 files changed, 360 insertions, 22 deletions

diff --git a/src/libs/tracing/CMakeLists.txt b/src/libs/tracing/CMakeLists.txt
index d8970a7962..826e04426d 100644
--- a/src/libs/tracing/CMakeLists.txt
+++ b/src/libs/tracing/CMakeLists.txt
@@ -43,7 +43,10 @@ if(${Qt5_VERSION} VERSION_LESS "6.2.0")
       qml/tracing.qrc
   )
 else() # < Qt 6.2
+  find_package(Qt6 COMPONENTS ShaderTools QUIET)
+
   add_qtc_library(Tracing
+    CONDITION TARGET Qt6::ShaderTools
     FEATURE_INFO
     DEPENDS Utils Qt5::Qml Qt5::Quick
     PUBLIC_DEPENDS Qt5::Widgets
@@ -86,12 +89,8 @@ else() # < Qt 6.2
     qml/ico_rangeselection@2x.png
     qml/ico_selectionmode.png
     qml/ico_selectionmode@2x.png
-    qml/notes.frag
-    qml/notes.vert
     qml/range_handle.png
     qml/range_handle@2.png
-    qml/timelineitems.frag
-    qml/timelineitems.vert
   )
 
   foreach(file IN LISTS TRACING_QML_FILES TRACING_QML_RESOURCES)
@@ -99,6 +98,17 @@ else() # < Qt 6.2
     set_source_files_properties("${file}" PROPERTIES QT_RESOURCE_ALIAS "${fileName}")
   endforeach()
 
+  qt_add_shaders(Tracing "res_tracingshaders"
+    BATCHABLE
+    PREFIX
+      "/QtCreator/Tracing"
+    FILES
+      qml/notes_qt6.vert
+      qml/notes_qt6.frag
+      qml/timelineitems_qt6.vert
+      qml/timelineitems_qt6.frag
+  )
+
   qt_add_qml_module(Tracing
     URI "QtCreator.Tracing"
     VERSION "1.0"
diff --git a/src/libs/tracing/qml/notes_qt6.frag b/src/libs/tracing/qml/notes_qt6.frag
new file mode 100644
index 0000000000..fb4ce9679b
--- /dev/null
+++ b/src/libs/tracing/qml/notes_qt6.frag
@@ -0,0 +1,36 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#version 440
+
+layout (location = 0) in vec4 color;
+layout (location = 1) in float d;
+
+layout (location = 0) out vec4 fragColor;
+
+void main()
+{
+    fragColor = color * float(d < (2.0 / 3.0) || d > (5.0 / 6.0));
+}
diff --git a/src/libs/tracing/qml/notes_qt6.vert b/src/libs/tracing/qml/notes_qt6.vert
new file mode 100644
index 0000000000..440ea4fa1c
--- /dev/null
+++ b/src/libs/tracing/qml/notes_qt6.vert
@@ -0,0 +1,46 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#version 440
+
+layout (location = 0) in vec4 vertexCoord;
+layout (location = 1) in float distanceFromTop;
+
+layout (std140, binding = 0) uniform Block {
+    mat4 matrix;
+    vec4 notesColor;
+} block;
+
+layout (location = 0) out vec4 color;
+layout (location = 1) out float d;
+
+void main()
+{
+    gl_Position = block.matrix * vertexCoord;
+    gl_Position.z -= 0.1;
+    gl_Position.w = 1.0;
+    color = block.notesColor;
+    d = distanceFromTop;
+}
diff --git a/src/libs/tracing/qml/timelineitems_qt6.frag b/src/libs/tracing/qml/timelineitems_qt6.frag
new file mode 100644
index 0000000000..ef59e543f0
--- /dev/null
+++ b/src/libs/tracing/qml/timelineitems_qt6.frag
@@ -0,0 +1,43 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#version 440
+
+layout (location = 0) in vec3 color;
+layout (location = 1) in vec3 edgeColor;
+layout (location = 2) in vec2 barycentric;
+
+layout (location = 0) out vec4 fragColor;
+
+void main()
+{
+    lowp vec2 d = fwidth(barycentric) * 4.0;
+    lowp vec4 edge_closeness = step(vec4(d.x, d.y, d.x, d.y),
+            vec4(barycentric.x, barycentric.y, 1.0 - barycentric.x, 1.0 - barycentric.y));
+    lowp float total = min(min(edge_closeness[0], edge_closeness[1]),
+            min(edge_closeness[2], edge_closeness[3]));
+    fragColor.rgb = mix(edgeColor, color, total);
+    fragColor.a = 1.0;
+}
diff --git a/src/libs/tracing/qml/timelineitems_qt6.vert b/src/libs/tracing/qml/timelineitems_qt6.vert
new file mode 100644
index 0000000000..0327b9e91d
--- /dev/null
+++ b/src/libs/tracing/qml/timelineitems_qt6.vert
@@ -0,0 +1,63 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#version 440
+
+layout (location = 0) in vec4 vertexCoord;
+layout (location = 1) in vec2 rectSize;
+layout (location = 2) in float selectionId;
+layout (location = 3) in vec4 vertexColor;
+
+layout (std140, binding = 0) uniform Block {
+    mat4 matrix;
+    vec2 scale;
+    vec4 selectionColor;
+    float selectedItem;
+} block;
+
+layout (location = 0) out vec3 color;
+layout (location = 1) out vec3 edgeColor;
+layout (location = 2) out vec2 barycentric;
+
+void main()
+{
+    gl_Position = block.matrix * vertexCoord;
+
+    // Make very narrow events somewhat wider so that they don't collapse into 0 pixels
+    float scaledWidth = block.scale.x * rectSize.x;
+    float shift = sign(rectSize.x) * max(0.0, 3.0 - abs(scaledWidth)) * 0.0005;
+    gl_Position.x += shift;
+
+    // Ditto for events with very small height
+    float scaledHeight = block.scale.y * rectSize.y;
+    gl_Position.y += float(rectSize.y > 0.0) * max(0.0, 3.0 - scaledHeight) * 0.003;
+
+    barycentric = vec2(rectSize.x > 0.0 ? 1.0 : 0.0, rectSize.y > 0.0 ? 1.0 : 0.0);
+    color = vertexColor.rgb;
+    float selected = min(abs(selectionId - block.selectedItem), 1.0);
+    edgeColor.rgb = mix(block.selectionColor.rgb, vertexColor.rgb, selected);
+    gl_Position.z += mix(0.0, (shift + 0.0015) / 10.0, selected);
+    gl_Position.w = 1.0;
+}
diff --git a/src/libs/tracing/timelineitemsrenderpass.cpp b/src/libs/tracing/timelineitemsrenderpass.cpp
index 344810d81d..8b0698c54c 100644
--- a/src/libs/tracing/timelineitemsrenderpass.cpp
+++ b/src/libs/tracing/timelineitemsrenderpass.cpp
@@ -474,8 +474,8 @@ TimelineItemsMaterialShader::TimelineItemsMaterialShader()
     setShaderSourceFile(QOpenGLShader::Fragment,
                         QStringLiteral(":/QtCreator/Tracing/timelineitems.frag"));
 #else // < Qt 6
-    setShaderFileName(VertexStage, ":/QtCreator/Tracing/timelineitems.vert");
-    setShaderFileName(FragmentStage, ":/QtCreator/Tracing/timelineitems.frag");
+    setShaderFileName(VertexStage, ":/QtCreator/Tracing/timelineitems_qt6.vert.qsb");
+    setShaderFileName(FragmentStage, ":/QtCreator/Tracing/timelineitems_qt6.frag.qsb");
 #endif // < Qt 6
 }
 
@@ -496,11 +496,29 @@ void TimelineItemsMaterialShader::updateState(const RenderState &state, QSGMater
 bool TimelineItemsMaterialShader::updateUniformData(RenderState &state,
                                                     QSGMaterial *newMaterial, QSGMaterial *)
 {
-    // TODO: Make this work
+    QByteArray *buf = state.uniformData();
+    auto material = static_cast<const TimelineItemsMaterial *>(newMaterial);
+
+    // mat4 matrix
     if (state.isMatrixDirty()) {
-        TimelineItemsMaterial *material = static_cast<TimelineItemsMaterial *>(newMaterial);
+        const QMatrix4x4 m = state.combinedMatrix();
+        memcpy(buf->data(), m.constData(), 64);
     }
-    return state.isMatrixDirty();
+
+    // vec2 scale
+    const QVector2D scale = material->scale();
+    memcpy(buf->data() + 64, &scale, 8);
+
+    // vec4 selectionColor
+    const QColor color = material->selectionColor();
+    const float colorArray[] = { color.redF(), color.greenF(), color.blueF(), color.alphaF() };
+    memcpy(buf->data() + 80, colorArray, 16);
+
+    // float selectedItem
+    const float selectedItem = material->selectedItem();
+    memcpy(buf->data() + 96, &selectedItem, 4);
+
+    return true;
 }
 #endif // < Qt 6
 
@@ -524,6 +542,9 @@ void TimelineItemsMaterialShader::initialize()
 TimelineItemsMaterial::TimelineItemsMaterial() : m_selectedItem(-1)
 {
     setFlag(QSGMaterial::Blending, false);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    setFlag(QSGMaterial::CustomCompileStep, true);
+#endif // >= Qt 6
 }
 
 QVector2D TimelineItemsMaterial::scale() const
diff --git a/src/libs/tracing/timelinenotesrenderpass.cpp b/src/libs/tracing/timelinenotesrenderpass.cpp
index e71366e74e..7eaefe9875 100644
--- a/src/libs/tracing/timelinenotesrenderpass.cpp
+++ b/src/libs/tracing/timelinenotesrenderpass.cpp
@@ -178,6 +178,9 @@ TimelineNotesRenderPassState::TimelineNotesRenderPassState(int numExpandedRows)
     m_nullGeometry(NotesGeometry::point2DWithDistanceFromTop(), 0)
 {
     m_material.setFlag(QSGMaterial::Blending, true);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    m_material.setFlag(QSGMaterial::CustomCompileStep, true);
+#endif // >= Qt 6
     m_expandedRows.reserve(numExpandedRows);
     for (int i = 0; i < numExpandedRows; ++i)
         m_expandedRows << createNode();
@@ -254,8 +257,8 @@ NotesMaterialShader::NotesMaterialShader()
     setShaderSourceFile(QOpenGLShader::Vertex, QStringLiteral(":/QtCreator/Tracing/notes.vert"));
     setShaderSourceFile(QOpenGLShader::Fragment, QStringLiteral(":/QtCreator/Tracing/notes.frag"));
 #else // < Qt 6
-    setShaderFileName(VertexStage, ":/QtCreator/Tracing/notes.vert");
-    setShaderFileName(FragmentStage, ":/QtCreator/Tracing/notes.frag");
+    setShaderFileName(VertexStage, ":/QtCreator/Tracing/notes_qt6.vert.qsb");
+    setShaderFileName(FragmentStage, ":/QtCreator/Tracing/notes_qt6.frag.qsb");
 #endif // < Qt 6
 }
 
@@ -278,9 +281,20 @@ void NotesMaterialShader::updateState(const RenderState &state, QSGMaterial *, Q
 #else // < Qt 6
 bool NotesMaterialShader::updateUniformData(RenderState &state, QSGMaterial *, QSGMaterial *)
 {
+    QByteArray *buf = state.uniformData();
+
+    // mat4 matrix
     if (state.isMatrixDirty()) {
+        const QMatrix4x4 m = state.combinedMatrix();
+        memcpy(buf->data(), m.constData(), 64);
     }
-    return state.isMatrixDirty();
+
+    // vec4 notesColor
+    const QColor color = notesColor();
+    const float colorArray[] = { color.redF(), color.greenF(), color.blueF(), color.alphaF() };
+    memcpy(buf->data() + 64, colorArray, 16);
+
+    return true;
 }
 #endif // < Qt 6
 
diff --git a/src/plugins/perfprofiler/CMakeLists.txt b/src/plugins/perfprofiler/CMakeLists.txt
index e1ee249ed0..2a3b3fbb3c 100644
--- a/src/plugins/perfprofiler/CMakeLists.txt
+++ b/src/plugins/perfprofiler/CMakeLists.txt
@@ -49,6 +49,7 @@ if(${Qt5_VERSION} VERSION_LESS "6.2.0")
   )
 else() # < Qt 6.2
   add_qtc_plugin(PerfProfiler
+    CONDITION TARGET Tracing
     DEPENDS Tracing Qt5::QuickWidgets
     PLUGIN_DEPENDS Core Debugger ProjectExplorer QtSupport
     SOURCES
diff --git a/src/plugins/qmlprofiler/CMakeLists.txt b/src/plugins/qmlprofiler/CMakeLists.txt
index aee047a576..e22bb1768f 100644
--- a/src/plugins/qmlprofiler/CMakeLists.txt
+++ b/src/plugins/qmlprofiler/CMakeLists.txt
@@ -79,7 +79,10 @@ if(${Qt5_VERSION} VERSION_LESS "6.2.0")
       qml/qmlprofiler.qrc
   )
 else() # < Qt 6.2
+  find_package(Qt6 COMPONENTS ShaderTools QUIET)
+
   add_qtc_plugin(QmlProfiler
+    CONDITION TARGET Tracing AND TARGET Qt6::ShaderTools
     DEPENDS QmlDebug QmlJS Tracing Qt5::QuickWidgets
     PLUGIN_DEPENDS Core Debugger ProjectExplorer QtSupport TextEditor
     SOURCES
@@ -94,16 +97,20 @@ else() # < Qt 6.2
     qml/QmlProfilerFlameGraphView.qml
   )
 
-  set(QMLPROFILER_QML_RESOURCES
-    qml/bindingloops.frag
-    qml/bindingloops.vert
-  )
-
-  foreach(file IN LISTS QMLPROFILER_QML_FILES QMLPROFILER_QML_RESOURCES)
+  foreach(file IN LISTS QMLPROFILER_QML_FILES)
     get_filename_component(fileName "${file}" NAME)
     set_source_files_properties("${file}" PROPERTIES QT_RESOURCE_ALIAS "${fileName}")
   endforeach()
 
+  qt_add_shaders(QmlProfiler "res_qmlprofilershaders"
+    BATCHABLE
+    PREFIX
+      "/QtCreator/QmlProfiler"
+    FILES
+      qml/bindingloops_qt6.frag
+      qml/bindingloops_qt6.vert
+  )
+
   qt_add_qml_module(QmlProfiler
     URI "QtCreator.QmlProfiler"
     VERSION "1.0"
diff --git a/src/plugins/qmlprofiler/qml/bindingloops_qt6.frag b/src/plugins/qmlprofiler/qml/bindingloops_qt6.frag
new file mode 100644
index 0000000000..73e48b3c5d
--- /dev/null
+++ b/src/plugins/qmlprofiler/qml/bindingloops_qt6.frag
@@ -0,0 +1,36 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#version 440
+
+layout (location = 0) in vec4 color;
+
+layout (location = 0) out vec4 fragColor;
+
+void main()
+{
+    fragColor.rgb = color.rgb;
+    fragColor.a = 1.0;
+}
diff --git a/src/plugins/qmlprofiler/qml/bindingloops_qt6.vert b/src/plugins/qmlprofiler/qml/bindingloops_qt6.vert
new file mode 100644
index 0000000000..da1f4279d1
--- /dev/null
+++ b/src/plugins/qmlprofiler/qml/bindingloops_qt6.vert
@@ -0,0 +1,46 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#version 440
+
+layout (location = 0) in vec4 vertexCoord;
+layout (location = 1) in vec2 postScaleOffset;
+
+layout (std140, binding = 0) uniform Block {
+    uniform mat4 matrix;
+    uniform vec4 bindingLoopsColor;
+} block;
+
+layout (location = 0) out vec4 color;
+
+void main()
+{
+    gl_Position = block.matrix * vertexCoord;
+    gl_Position.x += postScaleOffset.x * 0.005;
+    gl_Position.y += postScaleOffset.y * 0.01;
+    gl_Position.z -= 0.1;
+    gl_Position.w = 1.0;
+    color = block.bindingLoopsColor;
+}
diff --git a/src/plugins/qmlprofiler/qmlprofilerbindingloopsrenderpass.cpp b/src/plugins/qmlprofiler/qmlprofilerbindingloopsrenderpass.cpp
index 2d2f11fe11..edcc9d6361 100644
--- a/src/plugins/qmlprofiler/qmlprofilerbindingloopsrenderpass.cpp
+++ b/src/plugins/qmlprofiler/qmlprofilerbindingloopsrenderpass.cpp
@@ -326,8 +326,8 @@ BindingLoopMaterialShader::BindingLoopMaterialShader()
     setShaderSourceFile(QOpenGLShader::Fragment,
                         QStringLiteral(":/QtCreator/QmlProfiler/bindingloops.frag"));
 #else // < Qt 6
-    setShaderFileName(VertexStage, ":/QtCreator/QmlProfiler/bindingloops.vert");
-    setShaderFileName(FragmentStage, ":/QtCreator/QmlProfiler/bindingloops.frag");
+    setShaderFileName(VertexStage, ":/QtCreator/QmlProfiler/bindingloops_qt6.vert.qsb");
+    setShaderFileName(FragmentStage, ":/QtCreator/QmlProfiler/bindingloops_qt6.frag.qsb");
 #endif // < Qt 6
 }
 
@@ -348,8 +348,20 @@ void BindingLoopMaterialShader::updateState(const RenderState &state, QSGMateria
 #else // < Qt 6
 bool BindingLoopMaterialShader::updateUniformData(RenderState &state, QSGMaterial *, QSGMaterial *)
 {
-    // TODO: Make this work
-    return state.isMatrixDirty();
+    QByteArray *buf = state.uniformData();
+
+    // mat4 matrix
+    if (state.isMatrixDirty()) {
+        const QMatrix4x4 m = state.combinedMatrix();
+        memcpy(buf->data(), m.constData(), 64);
+    }
+
+    // vec4 bindingLoopsColor
+    const QColor color = bindingLoopsColor();
+    const float colorArray[] = { color.redF(), color.greenF(), color.blueF(), color.alphaF() };
+    memcpy(buf->data() + 64, colorArray, 16);
+
+    return true;
 }
 #endif // < Qt 6
 
@@ -371,6 +383,9 @@ void BindingLoopMaterialShader::initialize()
 BindingLoopMaterial::BindingLoopMaterial()
 {
     setFlag(QSGMaterial::Blending, false);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    setFlag(QSGMaterial::CustomCompileStep, true);
+#endif // >= Qt 6
 }
 
 QSGMaterialType *BindingLoopMaterial::type() const