[Shader Graph Gen.] Introduce QShaderGenerator

This class is meant to generate code from shader graphs

Change-Id: I1cf22352387f3f9f55e7589aa77a296689836911
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

6 files changed, 541 insertions, 0 deletions

diff --git a/src/gui/util/qshadergenerator.cpp b/src/gui/util/qshadergenerator.cpp
new file mode 100644
index 0000000000..5d6a05e2a0
--- /dev/null
+++ b/src/gui/util/qshadergenerator.cpp
@@ -0,0 +1,104 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qshadergenerator_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QByteArray QShaderGenerator::createShaderCode() const
+{
+    auto code = QByteArrayList();
+
+    if (format.isValid()) {
+        const auto isGLES = format.api() == QShaderFormat::OpenGLES;
+        const auto major = format.version().majorVersion();
+        const auto minor = format.version().minorVersion();
+
+        const auto version = major == 2 && isGLES ? 100
+                           : major == 3 && isGLES ? 300
+                           : major == 2 ? 100 + 10 * (minor + 1)
+                           : major == 3 && minor <= 2 ? 100 + 10 * (minor + 3)
+                           : major * 100 + minor * 10;
+
+        const auto profile = isGLES ? QByteArrayLiteral(" es")
+                           : version >= 150 && format.api() == QShaderFormat::OpenGLCoreProfile ? QByteArrayLiteral(" core")
+                           : version >= 150 && format.api() == QShaderFormat::OpenGLCompatibilityProfile ? QByteArrayLiteral(" compatibility")
+                           : QByteArray();
+
+        code << (QByteArrayLiteral("#version ") + QByteArray::number(version) + profile);
+        code << QByteArray();
+    }
+
+    for (const auto &node : graph.nodes()) {
+        for (const auto &snippet : node.rule(format).headerSnippets) {
+            code << snippet;
+        }
+    }
+
+    code << QByteArray();
+    code << QByteArrayLiteral("void main()");
+    code << QByteArrayLiteral("{");
+
+    for (const auto &statement : graph.createStatements()) {
+        const auto node = statement.node;
+        auto line = node.rule(format).substitution;
+        for (const auto &port : node.ports()) {
+            const auto portName = port.name;
+            const auto portDirection = port.direction;
+            const auto isInput = port.direction == QShaderNodePort::Input;
+
+            const auto portIndex = statement.portIndex(portDirection, portName);
+            const auto variableIndex = isInput ? statement.inputs.at(portIndex)
+                                               : statement.outputs.at(portIndex);
+            if (variableIndex < 0)
+                continue;
+
+            const auto placeholder = QByteArray(QByteArrayLiteral("$") + portName.toUtf8());
+            const auto variable = QByteArray(QByteArrayLiteral("v") + QByteArray::number(variableIndex));
+            line.replace(placeholder, variable);
+        }
+        code << QByteArrayLiteral("    ") + line;
+    }
+
+    code << QByteArrayLiteral("}");
+    code << QByteArray();
+    return code.join('\n');
+}
+
+QT_END_NAMESPACE
diff --git a/src/gui/util/qshadergenerator_p.h b/src/gui/util/qshadergenerator_p.h
new file mode 100644
index 0000000000..392c3532df
--- /dev/null
+++ b/src/gui/util/qshadergenerator_p.h
@@ -0,0 +1,75 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSHADERGENERATOR_P_H
+#define QSHADERGENERATOR_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtGui/private/qtguiglobal_p.h>
+
+#include <QtGui/private/qshadergraph_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QShaderGenerator
+{
+public:
+    Q_GUI_EXPORT QByteArray createShaderCode() const;
+
+    QShaderGraph graph;
+    QShaderFormat format;
+};
+
+Q_DECLARE_TYPEINFO(QShaderGenerator, Q_MOVABLE_TYPE);
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QShaderGenerator)
+
+#endif // QSHADERGENERATOR_P_H
diff --git a/src/gui/util/util.pri b/src/gui/util/util.pri
index 96b25df4f9..e7feda9a4a 100644
--- a/src/gui/util/util.pri
+++ b/src/gui/util/util.pri
@@ -8,6 +8,7 @@ HEADERS += \
         util/qabstractlayoutstyleinfo_p.h \
         util/qlayoutpolicy_p.h \
         util/qshaderformat_p.h \
+        util/qshadergenerator_p.h \
         util/qshadergraph_p.h \
         util/qshadernode_p.h \
         util/qshadernodeport_p.h
@@ -19,6 +20,7 @@ SOURCES += \
         util/qabstractlayoutstyleinfo.cpp \
         util/qlayoutpolicy.cpp \
         util/qshaderformat.cpp \
+        util/qshadergenerator.cpp \
         util/qshadergraph.cpp \
         util/qshadernode.cpp \
         util/qshadernodeport.cpp
diff --git a/tests/auto/gui/util/qshadergenerator/qshadergenerator.pro b/tests/auto/gui/util/qshadergenerator/qshadergenerator.pro
new file mode 100644
index 0000000000..c1f610e029
--- /dev/null
+++ b/tests/auto/gui/util/qshadergenerator/qshadergenerator.pro
@@ -0,0 +1,5 @@
+CONFIG += testcase
+QT += testlib gui-private
+
+SOURCES += tst_qshadergenerator.cpp
+TARGET = tst_qshadergenerator
diff --git a/tests/auto/gui/util/qshadergenerator/tst_qshadergenerator.cpp b/tests/auto/gui/util/qshadergenerator/tst_qshadergenerator.cpp
new file mode 100644
index 0000000000..655bc94f2c
--- /dev/null
+++ b/tests/auto/gui/util/qshadergenerator/tst_qshadergenerator.cpp
@@ -0,0 +1,354 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include <QtTest/QtTest>
+
+#include <QtGui/private/qshadergenerator_p.h>
+
+namespace
+{
+    QShaderFormat createFormat(QShaderFormat::Api api, int majorVersion, int minorVersion)
+    {
+        auto format = QShaderFormat();
+        format.setApi(api);
+        format.setVersion(QVersionNumber(majorVersion, minorVersion));
+        return format;
+    }
+
+    QShaderNodePort createPort(QShaderNodePort::Direction portDirection, const QString &portName)
+    {
+        auto port = QShaderNodePort();
+        port.direction = portDirection;
+        port.name = portName;
+        return port;
+    }
+
+    QShaderNode createNode(const QVector<QShaderNodePort> &ports)
+    {
+        auto node = QShaderNode();
+        node.setUuid(QUuid::createUuid());
+        for (const auto &port : ports)
+            node.addPort(port);
+        return node;
+    }
+
+    QShaderGraph::Edge createEdge(const QUuid &sourceUuid, const QString &sourceName,
+                                  const QUuid &targetUuid, const QString &targetName)
+    {
+        auto edge = QShaderGraph::Edge();
+        edge.sourceNodeUuid = sourceUuid;
+        edge.sourcePortName = sourceName;
+        edge.targetNodeUuid = targetUuid;
+        edge.targetPortName = targetName;
+        return edge;
+    }
+
+    QShaderGraph createGraph()
+    {
+        const auto openGLES2 = createFormat(QShaderFormat::OpenGLES, 2, 0);
+        const auto openGL3 = createFormat(QShaderFormat::OpenGLCoreProfile, 3, 0);
+
+        auto graph = QShaderGraph();
+
+        auto worldPosition = createNode({
+            createPort(QShaderNodePort::Output, "worldPosition")
+        });
+        worldPosition.addRule(openGLES2, QShaderNode::Rule("highp vec3 $worldPosition = worldPosition;",
+                                                           QByteArrayList() << "varying highp vec3 worldPosition;"));
+        worldPosition.addRule(openGL3, QShaderNode::Rule("vec3 $worldPosition = worldPosition;",
+                                                         QByteArrayList() << "in vec3 worldPosition;"));
+
+        auto texture = createNode({
+            createPort(QShaderNodePort::Output, "texture")
+        });
+        texture.addRule(openGLES2, QShaderNode::Rule("sampler2D $texture = texture;",
+                                                     QByteArrayList() << "uniform sampler2D texture;"));
+        texture.addRule(openGL3, QShaderNode::Rule("sampler2D $texture = texture;",
+                                                   QByteArrayList() << "uniform sampler2D texture;"));
+
+        auto texCoord = createNode({
+            createPort(QShaderNodePort::Output, "texCoord")
+        });
+        texCoord.addRule(openGLES2, QShaderNode::Rule("highp vec2 $texCoord = texCoord;",
+                                                      QByteArrayList() << "varying highp vec2 texCoord;"));
+        texCoord.addRule(openGL3, QShaderNode::Rule("vec2 $texCoord = texCoord;",
+                                                    QByteArrayList() << "in vec2 texCoord;"));
+
+        auto lightIntensity = createNode({
+            createPort(QShaderNodePort::Output, "lightIntensity")
+        });
+        lightIntensity.addRule(openGLES2, QShaderNode::Rule("highp float $lightIntensity = lightIntensity;",
+                                                            QByteArrayList() << "uniform highp float lightIntensity;"));
+        lightIntensity.addRule(openGL3, QShaderNode::Rule("float $lightIntensity = lightIntensity;",
+                                                          QByteArrayList() << "uniform float lightIntensity;"));
+
+        auto exposure = createNode({
+            createPort(QShaderNodePort::Output, "exposure")
+        });
+        exposure.addRule(openGLES2, QShaderNode::Rule("highp float $exposure = exposure;",
+                                                      QByteArrayList() << "uniform highp float exposure;"));
+        exposure.addRule(openGL3, QShaderNode::Rule("float $exposure = exposure;",
+                                                    QByteArrayList() << "uniform float exposure;"));
+
+        auto fragColor = createNode({
+            createPort(QShaderNodePort::Input, "fragColor")
+        });
+        fragColor.addRule(openGLES2, QShaderNode::Rule("gl_fragColor = $fragColor;"));
+        fragColor.addRule(openGL3, QShaderNode::Rule("fragColor = $fragColor;",
+                                                     QByteArrayList() << "out vec4 fragColor;"));
+
+        auto sampleTexture = createNode({
+            createPort(QShaderNodePort::Input, "sampler"),
+            createPort(QShaderNodePort::Input, "coord"),
+            createPort(QShaderNodePort::Output, "color")
+        });
+        sampleTexture.addRule(openGLES2, QShaderNode::Rule("highp vec4 $color = texture2D($sampler, $coord);"));
+        sampleTexture.addRule(openGL3, QShaderNode::Rule("vec4 $color = texture2D($sampler, $coord);"));
+
+        auto lightFunction = createNode({
+            createPort(QShaderNodePort::Input, "baseColor"),
+            createPort(QShaderNodePort::Input, "position"),
+            createPort(QShaderNodePort::Input, "lightIntensity"),
+            createPort(QShaderNodePort::Output, "outputColor")
+        });
+        lightFunction.addRule(openGLES2, QShaderNode::Rule("highp vec4 $outputColor = lightModel($baseColor, $position, $lightIntensity);",
+                                                           QByteArrayList() << "#pragma include es2/lightmodel.frag.inc"));
+        lightFunction.addRule(openGL3, QShaderNode::Rule("vec4 $outputColor = lightModel($baseColor, $position, $lightIntensity);",
+                                                         QByteArrayList() << "#pragma include gl3/lightmodel.frag.inc"));
+
+        auto exposureFunction = createNode({
+            createPort(QShaderNodePort::Input, "inputColor"),
+            createPort(QShaderNodePort::Input, "exposure"),
+            createPort(QShaderNodePort::Output, "outputColor")
+        });
+        exposureFunction.addRule(openGLES2, QShaderNode::Rule("highp vec4 $outputColor = $inputColor * pow(2.0, $exposure);"));
+        exposureFunction.addRule(openGL3, QShaderNode::Rule("vec4 $outputColor = $inputColor * pow(2.0, $exposure);"));
+
+        graph.addNode(worldPosition);
+        graph.addNode(texture);
+        graph.addNode(texCoord);
+        graph.addNode(lightIntensity);
+        graph.addNode(exposure);
+        graph.addNode(fragColor);
+        graph.addNode(sampleTexture);
+        graph.addNode(lightFunction);
+        graph.addNode(exposureFunction);
+
+        graph.addEdge(createEdge(texture.uuid(), "texture", sampleTexture.uuid(), "sampler"));
+        graph.addEdge(createEdge(texCoord.uuid(), "texCoord", sampleTexture.uuid(), "coord"));
+
+        graph.addEdge(createEdge(worldPosition.uuid(), "worldPosition", lightFunction.uuid(), "position"));
+        graph.addEdge(createEdge(sampleTexture.uuid(), "color", lightFunction.uuid(), "baseColor"));
+        graph.addEdge(createEdge(lightIntensity.uuid(), "lightIntensity", lightFunction.uuid(), "lightIntensity"));
+
+        graph.addEdge(createEdge(lightFunction.uuid(), "outputColor", exposureFunction.uuid(), "inputColor"));
+        graph.addEdge(createEdge(exposure.uuid(), "exposure", exposureFunction.uuid(), "exposure"));
+
+        graph.addEdge(createEdge(exposureFunction.uuid(), "outputColor", fragColor.uuid(), "fragColor"));
+
+        return graph;
+    }
+}
+
+class tst_QShaderGenerator : public QObject
+{
+    Q_OBJECT
+private slots:
+    void shouldHaveDefaultState();
+    void shouldGenerateShaderCode_data();
+    void shouldGenerateShaderCode();
+    void shouldGenerateVersionCommands_data();
+    void shouldGenerateVersionCommands();
+};
+
+void tst_QShaderGenerator::shouldHaveDefaultState()
+{
+    // GIVEN
+    auto generator = QShaderGenerator();
+
+    // THEN
+    QVERIFY(generator.graph.nodes().isEmpty());
+    QVERIFY(generator.graph.edges().isEmpty());
+    QVERIFY(!generator.format.isValid());
+}
+
+void tst_QShaderGenerator::shouldGenerateShaderCode_data()
+{
+    QTest::addColumn<QShaderGraph>("graph");
+    QTest::addColumn<QShaderFormat>("format");
+    QTest::addColumn<QByteArray>("expectedCode");
+
+    const auto graph = createGraph();
+
+    const auto openGLES2 = createFormat(QShaderFormat::OpenGLES, 2, 0);
+    const auto openGL3 = createFormat(QShaderFormat::OpenGLCoreProfile, 3, 0);
+    const auto openGL32 = createFormat(QShaderFormat::OpenGLCoreProfile, 3, 2);
+    const auto openGL4 = createFormat(QShaderFormat::OpenGLCoreProfile, 4, 0);
+
+    const auto versionGLES2 = QByteArrayList() << "#version 100 es" << "";
+    const auto versionGL3 = QByteArrayList() << "#version 130" << "";
+    const auto versionGL32 = QByteArrayList() << "#version 150 core" << "";
+    const auto versionGL4 = QByteArrayList() << "#version 400 core" << "";
+
+    const auto es2Code = QByteArrayList() << "varying highp vec3 worldPosition;"
+                                          << "uniform sampler2D texture;"
+                                          << "varying highp vec2 texCoord;"
+                                          << "uniform highp float lightIntensity;"
+                                          << "uniform highp float exposure;"
+                                          << "#pragma include es2/lightmodel.frag.inc"
+                                          << ""
+                                          << "void main()"
+                                          << "{"
+                                          << "    highp vec2 v2 = texCoord;"
+                                          << "    sampler2D v1 = texture;"
+                                          << "    highp float v3 = lightIntensity;"
+                                          << "    highp vec4 v5 = texture2D(v1, v2);"
+                                          << "    highp vec3 v0 = worldPosition;"
+                                          << "    highp float v4 = exposure;"
+                                          << "    highp vec4 v6 = lightModel(v5, v0, v3);"
+                                          << "    highp vec4 v7 = v6 * pow(2.0, v4);"
+                                          << "    gl_fragColor = v7;"
+                                          << "}"
+                                          << "";
+
+    const auto gl3Code = QByteArrayList() << "in vec3 worldPosition;"
+                                          << "uniform sampler2D texture;"
+                                          << "in vec2 texCoord;"
+                                          << "uniform float lightIntensity;"
+                                          << "uniform float exposure;"
+                                          << "out vec4 fragColor;"
+                                          << "#pragma include gl3/lightmodel.frag.inc"
+                                          << ""
+                                          << "void main()"
+                                          << "{"
+                                          << "    vec2 v2 = texCoord;"
+                                          << "    sampler2D v1 = texture;"
+                                          << "    float v3 = lightIntensity;"
+                                          << "    vec4 v5 = texture2D(v1, v2);"
+                                          << "    vec3 v0 = worldPosition;"
+                                          << "    float v4 = exposure;"
+                                          << "    vec4 v6 = lightModel(v5, v0, v3);"
+                                          << "    vec4 v7 = v6 * pow(2.0, v4);"
+                                          << "    fragColor = v7;"
+                                          << "}"
+                                          << "";
+
+    QTest::newRow("EmptyGraphAndFormat") << QShaderGraph() << QShaderFormat() << QByteArrayLiteral("\nvoid main()\n{\n}\n");
+    QTest::newRow("LightExposureGraphAndES2") << graph << openGLES2 << (versionGLES2 + es2Code).join('\n');
+    QTest::newRow("LightExposureGraphAndGL3") << graph << openGL3 << (versionGL3 + gl3Code).join('\n');
+    QTest::newRow("LightExposureGraphAndGL32") << graph << openGL32 << (versionGL32 + gl3Code).join('\n');
+    QTest::newRow("LightExposureGraphAndGL4") << graph << openGL4 << (versionGL4 + gl3Code).join('\n');
+}
+
+void tst_QShaderGenerator::shouldGenerateShaderCode()
+{
+    // GIVEN
+    QFETCH(QShaderGraph, graph);
+    QFETCH(QShaderFormat, format);
+
+    auto generator = QShaderGenerator();
+    generator.graph = graph;
+    generator.format = format;
+
+    // WHEN
+    const auto code = generator.createShaderCode();
+
+    // THEN
+    QFETCH(QByteArray, expectedCode);
+    QCOMPARE(code, expectedCode);
+}
+
+void tst_QShaderGenerator::shouldGenerateVersionCommands_data()
+{
+    QTest::addColumn<QShaderFormat>("format");
+    QTest::addColumn<QByteArray>("version");
+
+    QTest::newRow("GLES2") << createFormat(QShaderFormat::OpenGLES, 2, 0) << QByteArrayLiteral("#version 100 es");
+    QTest::newRow("GLES3") << createFormat(QShaderFormat::OpenGLES, 3, 0) << QByteArrayLiteral("#version 300 es");
+
+    QTest::newRow("GL20") << createFormat(QShaderFormat::OpenGLNoProfile, 2, 0) << QByteArrayLiteral("#version 110");
+    QTest::newRow("GL21") << createFormat(QShaderFormat::OpenGLNoProfile, 2, 1) << QByteArrayLiteral("#version 120");
+    QTest::newRow("GL30") << createFormat(QShaderFormat::OpenGLNoProfile, 3, 0) << QByteArrayLiteral("#version 130");
+    QTest::newRow("GL31") << createFormat(QShaderFormat::OpenGLNoProfile, 3, 1) << QByteArrayLiteral("#version 140");
+    QTest::newRow("GL32") << createFormat(QShaderFormat::OpenGLNoProfile, 3, 2) << QByteArrayLiteral("#version 150");
+    QTest::newRow("GL33") << createFormat(QShaderFormat::OpenGLNoProfile, 3, 3) << QByteArrayLiteral("#version 330");
+    QTest::newRow("GL40") << createFormat(QShaderFormat::OpenGLNoProfile, 4, 0) << QByteArrayLiteral("#version 400");
+    QTest::newRow("GL41") << createFormat(QShaderFormat::OpenGLNoProfile, 4, 1) << QByteArrayLiteral("#version 410");
+    QTest::newRow("GL42") << createFormat(QShaderFormat::OpenGLNoProfile, 4, 2) << QByteArrayLiteral("#version 420");
+    QTest::newRow("GL43") << createFormat(QShaderFormat::OpenGLNoProfile, 4, 3) << QByteArrayLiteral("#version 430");
+
+    QTest::newRow("GL20core") << createFormat(QShaderFormat::OpenGLCoreProfile, 2, 0) << QByteArrayLiteral("#version 110");
+    QTest::newRow("GL21core") << createFormat(QShaderFormat::OpenGLCoreProfile, 2, 1) << QByteArrayLiteral("#version 120");
+    QTest::newRow("GL30core") << createFormat(QShaderFormat::OpenGLCoreProfile, 3, 0) << QByteArrayLiteral("#version 130");
+    QTest::newRow("GL31core") << createFormat(QShaderFormat::OpenGLCoreProfile, 3, 1) << QByteArrayLiteral("#version 140");
+    QTest::newRow("GL32core") << createFormat(QShaderFormat::OpenGLCoreProfile, 3, 2) << QByteArrayLiteral("#version 150 core");
+    QTest::newRow("GL33core") << createFormat(QShaderFormat::OpenGLCoreProfile, 3, 3) << QByteArrayLiteral("#version 330 core");
+    QTest::newRow("GL40core") << createFormat(QShaderFormat::OpenGLCoreProfile, 4, 0) << QByteArrayLiteral("#version 400 core");
+    QTest::newRow("GL41core") << createFormat(QShaderFormat::OpenGLCoreProfile, 4, 1) << QByteArrayLiteral("#version 410 core");
+    QTest::newRow("GL42core") << createFormat(QShaderFormat::OpenGLCoreProfile, 4, 2) << QByteArrayLiteral("#version 420 core");
+    QTest::newRow("GL43core") << createFormat(QShaderFormat::OpenGLCoreProfile, 4, 3) << QByteArrayLiteral("#version 430 core");
+
+    QTest::newRow("GL20compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 2, 0) << QByteArrayLiteral("#version 110");
+    QTest::newRow("GL21compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 2, 1) << QByteArrayLiteral("#version 120");
+    QTest::newRow("GL30compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 3, 0) << QByteArrayLiteral("#version 130");
+    QTest::newRow("GL31compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 3, 1) << QByteArrayLiteral("#version 140");
+    QTest::newRow("GL32compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 3, 2) << QByteArrayLiteral("#version 150 compatibility");
+    QTest::newRow("GL33compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 3, 3) << QByteArrayLiteral("#version 330 compatibility");
+    QTest::newRow("GL40compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 4, 0) << QByteArrayLiteral("#version 400 compatibility");
+    QTest::newRow("GL41compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 4, 1) << QByteArrayLiteral("#version 410 compatibility");
+    QTest::newRow("GL42compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 4, 2) << QByteArrayLiteral("#version 420 compatibility");
+    QTest::newRow("GL43compatibility") << createFormat(QShaderFormat::OpenGLCompatibilityProfile, 4, 3) << QByteArrayLiteral("#version 430 compatibility");
+}
+
+void tst_QShaderGenerator::shouldGenerateVersionCommands()
+{
+    // GIVEN
+    QFETCH(QShaderFormat, format);
+
+    auto generator = QShaderGenerator();
+    generator.format = format;
+
+    // WHEN
+    const auto code = generator.createShaderCode();
+
+    // THEN
+    QFETCH(QByteArray, version);
+    const auto expectedCode = (QByteArrayList() << version
+                                                << ""
+                                                << ""
+                                                << "void main()"
+                                                << "{"
+                                                << "}"
+                                                << "").join('\n');
+    QCOMPARE(code, expectedCode);
+}
+
+QTEST_MAIN(tst_QShaderGenerator)
+
+#include "tst_qshadergenerator.moc"
diff --git a/tests/auto/gui/util/util.pro b/tests/auto/gui/util/util.pro
index 94404cd9f6..d7aacd7e06 100644
--- a/tests/auto/gui/util/util.pro
+++ b/tests/auto/gui/util/util.pro
@@ -5,6 +5,7 @@ SUBDIRS= \
     qintvalidator \
     qregexpvalidator \
     qregularexpressionvalidator \
+    qshadergenerator \
     qshadergraph \
     qshadernodes \