QmlDesigner: Add Effect Maker shader error propagation

In case of manual edit of shaders, this simple system detects common
errors that might be found in a shader.

Task-number: QDS-10499
Change-Id: I0c70ac85ef519880dcd98642c5927f037f113f94
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

src/plugins/qmldesigner/components/effectmaker/effectmakermodel.cpp

@@ -6,6 +6,8 @@
 #include "compositionnode.h"
 #include "uniform.h"
 
+#include <QRegularExpression>
+
 #include <utils/qtcassert.h>
 
 namespace QmlDesigner {
@@ -152,4 +154,77 @@ const QString EffectMakerModel::getFSUniforms()
     return s;
 }
 
+
+// Detects common GLSL error messages and returns potential
+// additional error information related to them.
+QString EffectMakerModel::detectErrorMessage(const QString &errorMessage)
+{
+    static QHash<QString, QString> nodeErrors {
+        { "'BLUR_HELPER_MAX_LEVEL' : undeclared identifier", "BlurHelper"},
+        { "'iSourceBlur1' : undeclared identifier", "BlurHelper"},
+        { "'hash23' : no matching overloaded function found", "NoiseHelper" },
+        { "'HASH_BOX_SIZE' : undeclared identifier", "NoiseHelper" },
+        { "'pseudo3dNoise' : no matching overloaded function found", "NoiseHelper" }
+    };
+
+    QString missingNodeError = QStringLiteral("Are you missing a %1 node?\n");
+    QHash<QString, QString>::const_iterator i = nodeErrors.constBegin();
+    while (i != nodeErrors.constEnd()) {
+        if (errorMessage.contains(i.key()))
+            return missingNodeError.arg(i.value());
+        ++i;
+    }
+    return QString();
+}
+
+// Return first error message (if any)
+EffectError EffectMakerModel::effectError() const
+{
+    for (const EffectError &e : std::as_const(m_effectErrors)) {
+        if (!e.m_message.isEmpty())
+            return e;
+    }
+    return {};
+}
+
+// Set the effect error message with optional type and lineNumber.
+// Type comes from ErrorTypes, defaulting to common errors (-1).
+// Note that type must match with UI editor tab index.
+void EffectMakerModel::setEffectError(const QString &errorMessage, int type, int lineNumber)
+{
+    EffectError error;
+    error.m_type = type;
+    if (type == 1 || type == 2) {
+        // For shaders, get the line number from baker output.
+        // Which is something like "ERROR: :15: message"
+        int glslErrorLineNumber = -1;
+        static QRegularExpression spaceReg("\\s+");
+        QStringList errorStringList = errorMessage.split(spaceReg, Qt::SkipEmptyParts);
+        if (errorStringList.size() >= 2) {
+            QString lineString  = errorStringList.at(1).trimmed();
+            if (lineString.size() >= 3) {
+                // String is ":[linenumber]:", get only the number.
+                glslErrorLineNumber = lineString.sliced(1, lineString.size() - 2).toInt();
+            }
+        }
+        error.m_line = glslErrorLineNumber;
+    } else {
+        // For QML (and others) use given linenumber
+        error.m_line = lineNumber;
+    }
+
+    QString additionalErrorInfo = detectErrorMessage(errorMessage);
+    error.m_message = additionalErrorInfo + errorMessage;
+    m_effectErrors.insert(type, error);
+    Q_EMIT effectErrorChanged();
+}
+
+void EffectMakerModel::resetEffectError(int type)
+{
+    if (m_effectErrors.contains(type)) {
+        m_effectErrors.remove(type);
+        Q_EMIT effectErrorChanged();
+    }
+}
+
 } // namespace QmlDesigner

src/plugins/qmldesigner/components/effectmaker/effectmakermodel.h

@@ -13,6 +13,17 @@ namespace QmlDesigner {
 class CompositionNode;
 class Uniform;
 
+struct EffectError {
+    Q_GADGET
+    Q_PROPERTY(QString message MEMBER m_message)
+    Q_PROPERTY(int line MEMBER m_line)
+    Q_PROPERTY(int type MEMBER m_type)
+public:
+    QString m_message;
+    int m_line = -1;
+    int m_type = -1;
+};
+
 class EffectMakerModel : public QAbstractListModel
 {
     Q_OBJECT
@@ -36,6 +47,7 @@ public:
 signals:
     void isEmptyChanged();
     void selectedIndexChanged(int idx);
+    void effectErrorChanged();
 
 private:
     enum Roles {
@@ -51,11 +63,18 @@ private:
     const QString getVSUniforms();
     const QString getFSUniforms();
 
+    QString detectErrorMessage(const QString &errorMessage);
+    EffectError effectError() const;
+    void setEffectError(const QString &errorMessage, int type, int lineNumber);
+    void resetEffectError(int type);
+
     QList<CompositionNode *> m_nodes;
 
     int m_selectedIndex = -1;
     bool m_isEmpty = true;
 
+    QMap<int, EffectError> m_effectErrors;
+
     ShaderFeatures m_shaderFeatures;
 };