Remove dependency to glu

Done-with: ckamm

1 files changed, 55 insertions, 4 deletions

diff --git a/src/ui/accelerometercontrol.cpp b/src/ui/accelerometercontrol.cpp
index b9ebb97..4f43a86 100644
--- a/src/ui/accelerometercontrol.cpp
+++ b/src/ui/accelerometercontrol.cpp
@@ -39,6 +39,7 @@
 #include <QtCore/QDir>
 #include <QtGui/QMatrix4x4>
 #include <QtGui/QMouseEvent>
+#include <QtGui/QVector3D>
 
 static QVector3D accelerometerX(-1, 0, 0);
 static QVector3D accelerometerY(0, 1, 0);
@@ -114,20 +115,70 @@ void AccelerometerControl::initializeGL()
     mNorthTexture = bindTexture(northImg);
 }
 
+/* since glu is not available everywhere we need to implement needed functions ourself */
+
+static void lookAt(float eyeX, float eyeY, float eyeZ, float centerX, float centerY, float centerZ, float upX, float upY, float upZ)
+{
+    QVector3D F(centerX - eyeX, centerY - eyeY, centerZ - eyeZ);
+    F.normalize();
+
+    QVector3D UP(upX, upY, upZ);
+    UP.normalize();
+
+    QVector3D s = QVector3D::crossProduct(F, UP);
+    QVector3D u = QVector3D::crossProduct(s, F);
+
+    GLfloat M[16];
+    M[0] = s.x();
+    M[4] = s.y();
+    M[8] = s.z();
+    M[12] = 0;
+
+    M[1] = u.x();
+    M[5] = u.y();
+    M[9] = u.z();
+    M[13] = 0;
+
+    M[2] = -F.x();
+    M[6] = -F.y();
+    M[10] = -F.z();
+    M[14] = 0;
+
+    M[3] = 0;
+    M[7] = 0;
+    M[11] = 0;
+    M[15] = 1;
+
+    glMultMatrixf(M);
+    glTranslatef(-eyeX, -eyeY, -eyeZ);
+}
+
+static void perspective(float fovY, float aspectRatio, float front, float back)
+{
+    const double DEG2RAD = 3.14159265 / 180;
+
+    double tangent = tan(fovY/2 * DEG2RAD);   // tangent of half fovY
+    double height = front * tangent;          // half height of near plane
+    double width = height * aspectRatio;      // half width of near plane
+
+    // params: left, right, bottom, top, near, far
+    glFrustum(-width, width, -height, height, front, back);
+}
+
 void AccelerometerControl::resizeGL(int w, int h)
 {
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     glViewport(0, 0, w, h);
     qreal aspect = (qreal)w / h;
-    gluPerspective(45, aspect, 0.1, 10);
+    perspective(45, aspect, 0.1, 10);
 
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
     glScalef (-1., 1., 1.); // left-handed system, x right, y up, z into
-    gluLookAt(0.7, 1, -2,
-              0, 0, 0,
-              0, 1, 0);
+    lookAt(0.7, 1, -2,
+           0, 0, 0,
+           0, 1, 0);
 }
 
 void AccelerometerControl::drawMobile()