Graph loader can load prototypes stored in the graph

Change-Id: Ib0bbfe5b0257bf355e83cc5287fa52b1e0cc3ed6
Reviewed-by: Mike Krus <mike.krus@kdab.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

src/gui/util/qshadergraphloader.cpp

@@ -39,6 +39,8 @@
 
 #include "qshadergraphloader_p.h"
 
+#include "qshadernodesloader_p.h"
+
 #include <QtCore/qdebug.h>
 #include <QtCore/qiodevice.h>
 #include <QtCore/qjsonarray.h>
@@ -129,6 +131,19 @@ void QShaderGraphLoader::load()
 
     bool hasError = false;
 
+    const auto prototypesValue = root.value(QStringLiteral("prototypes"));
+    if (!prototypesValue.isUndefined()) {
+        if (prototypesValue.isObject()) {
+            QShaderNodesLoader loader;
+            loader.load(prototypesValue.toObject());
+            m_prototypes.unite(loader.nodes());
+        } else {
+            qWarning() << "Invalid prototypes property, should be an object";
+            m_status = Error;
+            return;
+        }
+    }
+
     const auto nodes = nodesValue.toArray();
     for (const auto &nodeValue : nodes) {
         if (!nodeValue.isObject()) {

src/gui/util/qshadernodesloader.cpp

@@ -99,11 +99,15 @@ void QShaderNodesLoader::load()
     }
 
     const auto root = document.object();
+    load(root);
+}
 
+void QShaderNodesLoader::load(const QJsonObject &prototypesObject)
+{
     bool hasError = false;
 
-    for (const auto &property : root.keys()) {
-        const auto nodeValue = root.value(property);
+    for (const auto &property : prototypesObject.keys()) {
+        const auto nodeValue = prototypesObject.value(property);
         if (!nodeValue.isObject()) {
             qWarning() << "Invalid node found";
             hasError = true;

src/gui/util/qshadernodesloader_p.h

@@ -78,6 +78,7 @@ public:
     Q_GUI_EXPORT void setDevice(QIODevice *device) Q_DECL_NOTHROW;
 
     Q_GUI_EXPORT void load();
+    Q_GUI_EXPORT void load(const QJsonObject &prototypesObject);
 
 private:
     Status m_status;