Tidying up code.

examples/common/OpenGLWidget.cpp

@@ -4,19 +4,28 @@
 #include <QMatrix4x4>
 #include <QCoreApplication>
 #include <QTimer>
-//#include <QtMath>
 
 using namespace PolyVox;
 using namespace std;
 
 ////////////////////////////////////////////////////////////////////////////////
-// Public functions
+// Protected functions
 ////////////////////////////////////////////////////////////////////////////////
 OpenGLWidget::OpenGLWidget(QWidget *parent)
 	:QGLWidget(parent)
 {
 }
 
+const QMatrix4x4& OpenGLWidget::viewMatrix()
+{ 
+	return mViewMatrix;
+}
+
+const QMatrix4x4& OpenGLWidget::projectionMatrix()
+{
+	return mProjectionMatrix;
+}
+
 void OpenGLWidget::setCameraTransform(QVector3D position, float pitch, float yaw)
 {
 	mCameraPosition = position;
@@ -24,40 +33,8 @@ void OpenGLWidget::setCameraTransform(QVector3D position, float pitch, float yaw
 	mCameraPitch = pitch;
 }
 
-void OpenGLWidget::mousePressEvent(QMouseEvent* event)
-{
-	// Initialise these variables which will be used when the mouse actually moves.
-	m_CurrentMousePos = event->pos();
-	m_LastFrameMousePos = m_CurrentMousePos;
-}
-
-void OpenGLWidget::mouseMoveEvent(QMouseEvent* event)
-{
-	// Update the x and y rotations based on the mouse movement.
-	m_CurrentMousePos = event->pos();
-	QPoint diff = m_CurrentMousePos - m_LastFrameMousePos;
-	mCameraYaw -= diff.x() * mCameraRotateSpeed;
-	mCameraPitch -= diff.y() * mCameraRotateSpeed;
-	m_LastFrameMousePos = m_CurrentMousePos;
-}
-
-void OpenGLWidget::keyPressEvent(QKeyEvent* event)
-{
-	if (event->key() == Qt::Key_Escape)
-	{
-		close();
-	}
-
-	mPressedKeys.append(event->key());
-}
-
-void OpenGLWidget::keyReleaseEvent(QKeyEvent* event)
-{
-	mPressedKeys.removeAll(event->key());
-}
-
 ////////////////////////////////////////////////////////////////////////////////
-// Protected functions
+// Private functions
 ////////////////////////////////////////////////////////////////////////////////
 void OpenGLWidget::initializeGL()
 {
@@ -106,9 +83,8 @@ void OpenGLWidget::resizeGL(int w, int h)
 	float zNear = 1.0;
 	float zFar = 1000.0;
 	
-	projectionMatrix.setToIdentity();
-	//projectionMatrix.frustum(-aspectRatio, aspectRatio, -1, 1, zNear, zFar);
-	projectionMatrix.perspective(mCameraFOV, aspectRatio, zNear, zFar);
+	mProjectionMatrix.setToIdentity();
+	mProjectionMatrix.perspective(mCameraFOV, aspectRatio, zNear, zFar);
 }
 
 void OpenGLWidget::paintGL()
@@ -154,8 +130,8 @@ void OpenGLWidget::paintGL()
 		mCameraPosition -= cameraRight * deltaTime * mCameraMoveSpeed;
 	}
 
-	viewMatrix.setToIdentity();
-	viewMatrix.lookAt(
+	mViewMatrix.setToIdentity();
+	mViewMatrix.lookAt(
 		mCameraPosition,           // Camera is here
 		mCameraPosition + cameraForward, // and looks here : at the same position, plus "direction"
 		cameraUp                  // Head is up (set to 0,-1,0 to look upside-down)
@@ -173,3 +149,35 @@ void OpenGLWidget::paintGL()
 	  std::cerr << "OpenGL Error: " << errCode << std::endl;
 	}
 }
+
+void OpenGLWidget::mousePressEvent(QMouseEvent* event)
+{
+	// Initialise these variables which will be used when the mouse actually moves.
+	m_CurrentMousePos = event->pos();
+	m_LastFrameMousePos = m_CurrentMousePos;
+}
+
+void OpenGLWidget::mouseMoveEvent(QMouseEvent* event)
+{
+	// Update the x and y rotations based on the mouse movement.
+	m_CurrentMousePos = event->pos();
+	QPoint diff = m_CurrentMousePos - m_LastFrameMousePos;
+	mCameraYaw -= diff.x() * mCameraRotateSpeed;
+	mCameraPitch -= diff.y() * mCameraRotateSpeed;
+	m_LastFrameMousePos = m_CurrentMousePos;
+}
+
+void OpenGLWidget::keyPressEvent(QKeyEvent* event)
+{
+	if (event->key() == Qt::Key_Escape)
+	{
+		close();
+	}
+
+	mPressedKeys.append(event->key());
+}
+
+void OpenGLWidget::keyReleaseEvent(QKeyEvent* event)
+{
+	mPressedKeys.removeAll(event->key());
+}

examples/common/OpenGLWidget.h

@@ -34,17 +34,33 @@ distribution.
 #include <QOpenGLVertexArrayObject>
 #include <QOpenGLBuffer>
 
-// Our OpenGLWidget is used by all the examples to render the extracted meshes. It is
-// fairly specific to our needs (you probably won't want to use it in your own project)
-// but should provide a useful illustration of how PolyVox meshes can be rendered.
+// This is a very basic class for getting an OpenGL example up and running with Qt5. It simply displays
+// an OpenGL widget and implements an FPS-style camera as well as other very basic functionality. User
+// code can derive from this and override the provided virtual functions to implement functionality.
 class OpenGLWidget : public QGLWidget, protected QOpenGLFunctions_3_1
 {
-public:
-	// Constructor
+protected:
+	// Protected constructor because this widget should not be created directly - it should only be subclassed.
 	OpenGLWidget(QWidget *parent);
 
+	// Derived classes should override these to provide functionality.
+	virtual void initialize() {}
+	virtual void renderOneFrame() {}
+
+	// Getters for properties defined by this widget.
+	const QMatrix4x4& viewMatrix();
+	const QMatrix4x4& projectionMatrix();
+
+	// Setters for properties defined by this widget.
 	void setCameraTransform(QVector3D position, float pitch, float yaw);
 
+private:
+
+	// Qt OpenGL functions
+	void initializeGL();
+	void resizeGL(int w, int h);
+	void paintGL();
+
 	// Mouse handling
 	void mouseMoveEvent(QMouseEvent* event);
 	void mousePressEvent(QMouseEvent* event);
@@ -53,21 +69,9 @@ public:
 	void keyPressEvent(QKeyEvent* event);
 	void keyReleaseEvent(QKeyEvent* event);
 
-protected:
-
-	// Qt OpenGL functions
-	void initializeGL();
-	void resizeGL(int w, int h);
-	void paintGL();
-
-	virtual void initialize() {}
-	virtual void renderOneFrame() {}
-
-protected:
-
 	// Matrices
-	QMatrix4x4 viewMatrix;
-	QMatrix4x4 projectionMatrix;
+	QMatrix4x4 mViewMatrix;
+	QMatrix4x4 mProjectionMatrix;
 
 	// Mouse data
 	QPoint m_LastFrameMousePos;

examples/common/PolyVoxExample.h

@@ -163,8 +163,8 @@ protected:
 		mShader->bind();
 
 		// These two matrices are constant for all meshes.
-		mShader->setUniformValue("viewMatrix", viewMatrix);
-		mShader->setUniformValue("projectionMatrix", projectionMatrix);
+		mShader->setUniformValue("viewMatrix", viewMatrix());
+		mShader->setUniformValue("projectionMatrix", projectionMatrix());
 
 		// Iterate over each mesh which the user added to our list, and render it.
 		for (OpenGLMeshData meshData : mMeshData)