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>

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"

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;
+}

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;
+}

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