Make public headers compile with -Wzero-as-null-pointer-constant

... or equivalent.

Also mark some ctors explicit.

Change-Id: I9fb029fb6cc5eccee30f8eff81e0a1b2616da465
Task-number: QTBUG-45291
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

src/input/frontend/qkeyboarddevice.h

@@ -57,7 +57,7 @@ class QT3DINPUTSHARED_EXPORT QKeyboardDevice : public Qt3DInput::QAbstractPhysic
     Q_PROPERTY(Qt3DInput::QKeyboardHandler *activeInput READ activeInput NOTIFY activeInputChanged)
 
 public:
-    explicit QKeyboardDevice(QNode *parent = 0);
+    explicit QKeyboardDevice(QNode *parent = nullptr);
 
     QKeyboardHandler *activeInput() const;
 
@@ -69,7 +69,7 @@ public:
     int buttonIdentifier(const QString &name) const Q_DECL_FINAL;
 
 protected:
-    QKeyboardDevice(QKeyboardDevicePrivate &dd, QNode *parent = 0);
+    explicit QKeyboardDevice(QKeyboardDevicePrivate &dd, QNode *parent = nullptr);
     void sceneChangeEvent(const Qt3DCore::QSceneChangePtr &change) Q_DECL_OVERRIDE;
 
 Q_SIGNALS:

src/render/framegraph/qclearbuffers.h

@@ -58,7 +58,7 @@ class QT3DRENDERSHARED_EXPORT QClearBuffers : public QFrameGraphNode
     Q_PROPERTY(float clearDepthValue READ clearDepthValue WRITE setClearDepthValue NOTIFY clearDepthValueChanged)
     Q_PROPERTY(int clearStencilValue READ clearStencilValue WRITE setClearStencilValue NOTIFY clearStencilValueChanged)
 public:
-    explicit QClearBuffers(Qt3DCore::QNode *parent = 0);
+    explicit QClearBuffers(Qt3DCore::QNode *parent = nullptr);
 
     enum BufferType {
         None = 0,
@@ -91,7 +91,7 @@ Q_SIGNALS:
     void clearStencilValueChanged(int clearStencilValue);
 
 protected:
-    QClearBuffers(QClearBuffersPrivate &dd, Qt3DCore::QNode *parent = 0);
+    explicit QClearBuffers(QClearBuffersPrivate &dd, Qt3DCore::QNode *parent = nullptr);
     void copy(const Qt3DCore::QNode *ref) Q_DECL_OVERRIDE;
 
 private:

src/render/framegraph/qrenderstateset.h

@@ -54,14 +54,14 @@ class QT3DRENDERSHARED_EXPORT QRenderStateSet : public QFrameGraphNode
     Q_OBJECT
 
 public:
-    explicit QRenderStateSet(Qt3DCore::QNode *parent = 0);
+    explicit QRenderStateSet(Qt3DCore::QNode *parent = nullptr);
 
     void addRenderState(QRenderState *state);
     void removeRenderState(QRenderState *state);
     QVector<QRenderState *> renderStates() const;
 
 protected:
-    QRenderStateSet(QRenderStateSetPrivate &dd, Qt3DCore::QNode *parent = 0);
+    explicit QRenderStateSet(QRenderStateSetPrivate &dd, Qt3DCore::QNode *parent = nullptr);
     void copy(const Qt3DCore::QNode *ref) Q_DECL_OVERRIDE;
 
 private:

src/render/framegraph/qsortpolicy.h

@@ -53,7 +53,7 @@ class QT3DRENDERSHARED_EXPORT QSortPolicy : public QFrameGraphNode
     Q_OBJECT
     Q_PROPERTY(QVariantList sortTypes READ sortTypeList WRITE setSortTypes NOTIFY sortTypesChanged)
 public:
-    explicit QSortPolicy(Qt3DCore::QNode *parent = 0);
+    explicit QSortPolicy(Qt3DCore::QNode *parent = nullptr);
 
     enum SortType {
         StateChangeCost = (1 << 0),
@@ -76,7 +76,7 @@ Q_SIGNALS:
     void sortTypesChanged(QVariantList sortTypes);
 
 protected:
-    QSortPolicy(QSortPolicyPrivate &dd, Qt3DCore::QNode *parent = 0);
+    explicit QSortPolicy(QSortPolicyPrivate &dd, Qt3DCore::QNode *parent = nullptr);
     void copy(const Qt3DCore::QNode *ref) Q_DECL_OVERRIDE;
 
 private:

src/render/frontend/qrendertargetoutput.h

@@ -84,7 +84,7 @@ public:
     };
     Q_ENUM(AttachmentPoint)
 
-    explicit QRenderTargetOutput(Qt3DCore::QNode *parent = 0);
+    explicit QRenderTargetOutput(Qt3DCore::QNode *parent = nullptr);
 
     AttachmentPoint attachmentPoint() const;
     QAbstractTexture *texture() const;
@@ -107,7 +107,7 @@ Q_SIGNALS:
     void faceChanged(QAbstractTexture::CubeMapFace face);
 
 protected:
-    QRenderTargetOutput(QRenderTargetOutputPrivate &dd, Qt3DCore::QNode *parent = 0);
+    explicit QRenderTargetOutput(QRenderTargetOutputPrivate &dd, Qt3DCore::QNode *parent = nullptr);
     void copy(const Qt3DCore::QNode *ref) Q_DECL_OVERRIDE;
 
 private:

src/render/io/qsceneloader.h

@@ -81,7 +81,7 @@ Q_SIGNALS:
 
 protected:
     QT3D_CLONEABLE(QSceneLoader)
-    QSceneLoader(QSceneLoaderPrivate &dd, Qt3DCore::QNode *parent = 0);
+    explicit QSceneLoader(QSceneLoaderPrivate &dd, Qt3DCore::QNode *parent = nullptr);
     void copy(const Qt3DCore::QNode *ref) Q_DECL_OVERRIDE;
 
 private:

src/render/renderstates/qblendequationarguments.h

@@ -84,7 +84,7 @@ public:
     };
     Q_ENUM(Blending)
 
-    explicit QBlendEquationArguments(Qt3DCore::QNode *parent = 0);
+    explicit QBlendEquationArguments(Qt3DCore::QNode *parent = nullptr);
 
     Blending sourceRgb() const;
     Blending destinationRgb() const;

src/render/renderstates/qstenciloperation.h

@@ -56,7 +56,7 @@ class QT3DRENDERSHARED_EXPORT QStencilOperation : public QRenderState
     Q_PROPERTY(Qt3DRender::QStencilOperationArguments *back READ back CONSTANT)
 
 public:
-    explicit QStencilOperation(Qt3DCore::QNode *parent = 0);
+    explicit QStencilOperation(Qt3DCore::QNode *parent = nullptr);
 
     QStencilOperationArguments *front() const;
     QStencilOperationArguments *back() const;

src/render/renderstates/qstenciloperationarguments.h

@@ -100,7 +100,7 @@ Q_SIGNALS:
     void faceModeChanged(FaceMode faceMode);
 
 private:
-    explicit QStencilOperationArguments(FaceMode mode, QObject *parent = 0);
+    explicit QStencilOperationArguments(FaceMode mode, QObject *parent = nullptr);
     Q_DECLARE_PRIVATE(QStencilOperationArguments)
 
     friend class QStencilOperationPrivate;

src/render/renderstates/qstenciltestarguments.h

@@ -100,7 +100,7 @@ Q_SIGNALS:
     void faceModeChanged(StencilFaceMode faceMode);
 
 private:
-    explicit QStencilTestArguments(StencilFaceMode face, QObject *parent = 0);
+    explicit QStencilTestArguments(StencilFaceMode face, QObject *parent = nullptr);
 
     friend class QStencilTestPrivate;
 

src/render/texture/qtexture.h

@@ -59,77 +59,77 @@ class QT3DRENDERSHARED_EXPORT QTexture1D : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTexture1D(Qt3DCore::QNode *parent = 0);
+    explicit QTexture1D(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTexture1DArray : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTexture1DArray(Qt3DCore::QNode *parent = 0);
+    explicit QTexture1DArray(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTexture2D : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTexture2D(Qt3DCore::QNode *parent = 0);
+    explicit QTexture2D(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTexture2DArray : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTexture2DArray(Qt3DCore::QNode *parent = 0);
+    explicit QTexture2DArray(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTexture3D : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTexture3D(Qt3DCore::QNode *parent = 0);
+    explicit QTexture3D(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTextureCubeMap : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTextureCubeMap(Qt3DCore::QNode *parent = 0);
+    explicit QTextureCubeMap(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTextureCubeMapArray : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTextureCubeMapArray(Qt3DCore::QNode *parent = 0);
+    explicit QTextureCubeMapArray(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTexture2DMultisample : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTexture2DMultisample(Qt3DCore::QNode *parent = 0);
+    explicit QTexture2DMultisample(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTexture2DMultisampleArray : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTexture2DMultisampleArray(Qt3DCore::QNode *parent = 0);
+    explicit QTexture2DMultisampleArray(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTextureRectangle : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTextureRectangle(Qt3DCore::QNode *parent = 0);
+    explicit QTextureRectangle(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QT3DRENDERSHARED_EXPORT QTextureBuffer : public QAbstractTexture
 {
     Q_OBJECT
 public:
-    explicit QTextureBuffer(Qt3DCore::QNode *parent = 0);
+    explicit QTextureBuffer(Qt3DCore::QNode *parent = nullptr);
 };
 
 class QTextureLoaderPrivate;