added Shader

A1/hellocube/cubewidget.cpp

@@ -22,6 +22,7 @@ void CubeWidget::initializeGL ()
     glEnable(GL_DEPTH_TEST);
 
     tesselation = 0;
+    prepareShader();
     // enable default shading
     home();
     showFlat();
@@ -30,13 +31,40 @@ void CubeWidget::initializeGL ()
     glEnable(GL_LIGHT0);
     static GLfloat lightPosition[4] = { 0.5, 0.0, 2.0, 1.0 };
     glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
+    GLfloat white[] = {1.0,1.0,1.0};
+    glLightfv(GL_LIGHT0, GL_DIFFUSE, white);
+    glLightfv(GL_LIGHT0, GL_SPECULAR, white);
+
+
+
+
+}
+
+void CubeWidget::prepareShader()
+{
+    QGLShader *vertex = new QGLShader(QGLShader::Vertex);
+    if(!vertex->compileSourceFile(QLatin1String(":/phong.vert")))
+        qCritical()<< "Vertex Shader failed"<< vertex->log();
+
+    QGLShader *fragment = new QGLShader(QGLShader::Fragment);
+    if(!fragment->compileSourceFile(QLatin1String(":/phong.frag")))
+        qCritical()<< "Fragment Shader failed"<< fragment->log();
+
+    shader = new QGLShaderProgram(this);
+    shader->addShader(vertex);
+    shader->addShader(fragment);
+    if(!shader->link())
+        qCritical()<< "Linking  failed"<<shader->log();
 }
 
 void CubeWidget::setMaterial(GLfloat *color )
 {
+    glMaterialfv(GL_FRONT,GL_AMBIENT,color);
     glMaterialfv(GL_FRONT,GL_DIFFUSE,color);
     glMaterialfv(GL_FRONT,GL_SPECULAR,color);
-    glMaterialfv(GL_FRONT,GL_SHININESS,color);
+
+    glMaterialfv(GL_FRONT,GL_SHININESS,new GLfloat(50.0));
+
 }
 
 void CubeWidget::paintGL ( )
@@ -50,19 +78,15 @@ void CubeWidget::paintGL ( )
     mat.rotate(*rotation);
     glMultMatrixf(mat.data());
 
-
-
-
     GLfloat red[] = {1.0,0.0,0.0};
     GLfloat green[] = {0.0,1.0,0.0};
     GLfloat blue[] = {0.0,0.0,1.0};
     GLfloat cyan[] = {0.0,1.0,1.0};
     GLfloat magenta[] = {1.0,0.0,1.0};
     GLfloat yellow[] = {1.0,1.0,0.0};
-
-    glBegin(GL_QUADS);
     float increment = 1.0/(pow(2,tesselation));
 
+    glBegin(GL_QUADS);
     setMaterial(red);
     for (float x = -0.5; x < 0.5 ; x+= increment) {
         for (float y = -0.5; y < 0.5 ; y+= increment ) {
@@ -72,7 +96,9 @@ void CubeWidget::paintGL ( )
             glVertex3f( x+increment, 0.5f, y+increment);
         }
     }
+    glEnd();
 
+    glBegin(GL_QUADS);
     setMaterial(magenta);
     for (float x = -0.5; x < 0.5 ; x+= increment) {
         for (float y = -0.5; y < 0.5 ; y+= increment ) {
@@ -82,7 +108,9 @@ void CubeWidget::paintGL ( )
             glVertex3f( x+increment, -0.5f, y);
         }
     }
+    glEnd();
 
+    glBegin(GL_QUADS);
     setMaterial(green);
     for (float x = -0.5; x < 0.5 ; x+= increment) {
         for (float y = -0.5; y < 0.5 ; y+= increment ) {
@@ -92,7 +120,9 @@ void CubeWidget::paintGL ( )
             glVertex3f( x+increment, y, 0.5f);
         }
     }
+    glEnd();
 
+    glBegin(GL_QUADS);
     setMaterial(yellow);
     for (float x = -0.5; x < 0.5 ; x+= increment) {
         for (float y = -0.5; y < 0.5 ; y+= increment ) {
@@ -102,8 +132,9 @@ void CubeWidget::paintGL ( )
             glVertex3f( x+increment,y+increment, -0.5f);
         }
     }
+    glEnd();
 
-
+    glBegin(GL_QUADS);
     setMaterial(blue);
     for (float x = -0.5; x < 0.5 ; x+= increment) {
         for (float y = -0.5; y < 0.5 ; y+= increment ) {
@@ -113,7 +144,8 @@ void CubeWidget::paintGL ( )
             glVertex3f(  -0.5f,x, y+increment);
         }
     }
-
+    glEnd();
+    glBegin(GL_QUADS);
     setMaterial(cyan);
     for (float x = -0.5; x < 0.5 ; x+= increment) {
         for (float y = -0.5; y < 0.5 ; y+= increment ) {
@@ -158,9 +190,9 @@ void CubeWidget::showWireframe()
 
     qDebug("show Wireframe");
     glShadeModel(GL_FLAT);
-   // glDisable(GL_CULL_FACE);
 
     glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
+    shader->release();
     updateGL();
 }
 
@@ -168,8 +200,8 @@ void CubeWidget::showFlat()
 {
     qDebug("show Flat");
     glShadeModel(GL_FLAT);
-   // glEnable(GL_CULL_FACE);
     glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
+    shader->release();
     updateGL();
 }
 
@@ -177,15 +209,17 @@ void CubeWidget::showGouraut()
 {
     qDebug("show Gouraut");
     glShadeModel(GL_SMOOTH);
-  //  glEnable(GL_CULL_FACE);
     glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
+    shader->release();
     updateGL();
 }
 
 void CubeWidget::showPhong()
 {
     qDebug("show Phong");
-    showFlat();
+    glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
+    shader->bind();
+    updateGL();
 
 }
 
@@ -206,11 +240,10 @@ void CubeWidget::home()
 void CubeWidget::mousePressEvent(QMouseEvent *event )
 {
 
-   // if (event->isAccepted())
-   //     return;
+    // if (event->isAccepted())
+    //     return;
 
     if (event->buttons() & Qt::LeftButton) {
-        qDebug("press");
         lastPos = trackballPoint(event->pos().x(),event->pos().y());
 
 
@@ -226,11 +259,10 @@ void CubeWidget::mouseMoveEvent(QMouseEvent *event )
     //http://web.cse.ohio-state.edu/~hwshen/781/Site/Slides_files/trackball.pdf
     //http://doc.qt.io/qt-5/qtwidgets-graphicsview-boxes-example.html
 
-   // if (event->isAccepted())
+    // if (event->isAccepted())
     //    return;
 
     if (event->buttons() & Qt::LeftButton) {
-         qDebug("move");
         move(trackballPoint(event->pos().x(),event->pos().y()));
 
         //m_trackBalls[0].move(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
@@ -242,25 +274,25 @@ void CubeWidget::mouseMoveEvent(QMouseEvent *event )
 
 void CubeWidget::move(QVector3D *newPos )
 {
-     QVector3D axis = QVector3D::crossProduct(*lastPos,*newPos);
+    QVector3D axis = QVector3D::crossProduct(*lastPos,*newPos);
 
-     //warum so besser
-     float angle = 180 / M_PI * std::asin(std::sqrt(QVector3D::dotProduct(axis, axis)));
-     axis.normalize();
+    //warum so besser
+    float angle = 180 / M_PI * std::asin(std::sqrt(QVector3D::dotProduct(axis, axis)));
+    axis.normalize();
 
-     axis = rotation->conjugate().rotatedVector(axis);
-     QQuaternion newRot = QQuaternion::fromAxisAndAngle(axis, angle) * *rotation;
-     rotation = new QQuaternion(newRot.toVector4D());
+    //axis = rotation->conjugate().rotatedVector(axis);
+    QQuaternion newRot = QQuaternion::fromAxisAndAngle(axis, angle) * *rotation;
+    rotation = new QQuaternion(newRot.toVector4D());
 
-     lastPos = newPos;
-     updateGL();
+    lastPos = newPos;
+    updateGL();
 
 }
 
 QVector3D* CubeWidget::trackballPoint(int x, int y){
     float xo,yo,zo;
 
-    qDebug()<<"x:"<< x << " y:"<<y;
+   // qDebug()<<"x:"<< x << " y:"<<y;
     xo = ((2.0*x)-width())/ height();
     yo = (height()-(2.0*y))/width();
 
@@ -271,7 +303,7 @@ QVector3D* CubeWidget::trackballPoint(int x, int y){
 
     QVector3D *pos = new QVector3D(xo,yo,zo);
     pos->normalize();
-    qDebug()<<"x:"<< xo << " y:"<<yo<<" z:"<<zo;
+  //  qDebug()<<"x:"<< xo << " y:"<<yo<<" z:"<<zo;
     return pos;
 }
 

A1/hellocube/cubewidget.h

@@ -46,6 +46,10 @@ private:
     QVector3D *lastPos;
     bool mousDown = false;
 
+    QGLShaderProgram *shader;
+
+    void prepareShader();
+
     void perspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar);
     void setMaterial(GLfloat *color );
     void move(QVector3D *newPos );

A1/hellocube/hellocube.pro

@@ -20,3 +20,7 @@ HEADERS  += mainwindow.h \
 
 RESOURCES += \
     hellocube.qrc
+
+DISTFILES += \
+    phong.frag \
+    phong.vert

A1/hellocube/hellocube.qrc

@@ -5,5 +5,7 @@
         <file>img/gouraud.png</file>
         <file>img/phong.png</file>
         <file>img/wireframe.png</file>
+        <file>phong.frag</file>
+        <file>phong.vert</file>
     </qresource>
 </RCC>

A1/hellocube/phong.frag

+uniform gl_LightSourceParameters gl_LightSource[gl_MaxLights];
+uniform gl_MaterialParameters gl_FrontMaterial;
+uniform gl_LightModelProducts gl_FrontLightModelProduct;
+
+varying vec3 position;
+varying vec3 normal;
+
+void main(void)
+{
+    vec3 N = normalize(normal);
+    vec3 L = normalize(vec3(gl_LightSource[0].position)-position);
+    vec3 V = normalize(-position.xyz);
+    vec3 R = reflect(-L,N);
+
+    vec4 diffuse = vec4(max(dot(L,N),0.0));
+    vec4 specular = vec4(pow(max(dot(R,V),0.0),gl_FrontMaterial.shininess));
+
+    vec4 Iamb = gl_FrontLightProduct[0].ambient;
+    vec4 Idiff = gl_FrontLightProduct[0].diffuse*diffuse;
+    Idiff = clamp(Idiff, 0.0, 1.0);
+
+    vec4 Ispec = gl_FrontLightProduct[0].specular*specular;
+    Ispec = clamp(Idiff, 0.0, 1.0);
+
+    vec4 color = /*gl_FrontLightModelProduct.sceneColor +*/ Iamb + Idiff + Ispec;
+
+    gl_FragColor = vec4(color);
+}

A1/hellocube/phong.vert

+attribute vec4 gl_Vertex;
+attribute vec3 gl_Normal;
+
+
+uniform mat4 gl_ModelViewProjectionMatrix;
+uniform mat4 gl_ModelViewMatrix;
+uniform mat3 gl_NormalMatrix;
+
+varying vec3 position;
+varying vec3 normal;
+
+void main(void)
+{
+    normal = normalize(gl_NormalMatrix * gl_Normal);
+    position = vec3(gl_ModelViewMatrix *gl_Vertex);
+
+    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
+}
+