void GLUTDisplay(const AffineSpace3f& camera, float s, Handle<Device::RTScene>& scene)
{
g_camSpace = camera;
g_speed = s;
g_render_scene = scene;
scene = NULL; // GLUT will never end this function, thus cleanup scene by hand
/* initialize orbit camera model */
Vector3f viewVec = normalize(g_camLookAt - g_camPos);
theta = atan2f(-viewVec.x, -viewVec.z);
phi = asinf(viewVec.y);
Vector3f approxUp(0.0f, 1.0f, 0.0f);
if (phi < -0.5f*float(pi) || phi > 0.5*float(pi)) approxUp = -approxUp;
Vector3f rightVec = normalize(cross(viewVec, approxUp));
Vector3f upUnrotated = cross(rightVec, viewVec);
psi = atan2f(dot(rightVec, g_camUp), dot(upUnrotated, g_camUp));
/* initialize GLUT */
int argc = 1; char* argv = (char*)"";
glutInit(&argc, &argv);
glutInitWindowSize((GLsizei)g_width, (GLsizei)g_height);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
glutInitWindowPosition(0, 0);
g_window = glutCreateWindow("Embree");
if (g_fullscreen) glutFullScreen();
//glutSetCursor(GLUT_CURSOR_NONE);
glutDisplayFunc(displayFunc);
glutIdleFunc(idleFunc);
glutKeyboardFunc(keyboardFunc);
glutSpecialFunc(specialFunc);
glutMouseFunc(clickFunc);
glutMotionFunc(motionFunc);
glutReshapeFunc(reshapeFunc);
glutMainLoop();
}
void motionFunc(int x, int y)
{
float dClickX = float(clickX - x), dClickY = float(clickY - y);
clickX = x; clickY = y;
// Rotate camera around look-at point (LMB + mouse move)
if (mouseMode == 1) {
#define ROTATE_WITH_FIXED_UPVECTOR 1
#if ROTATE_WITH_FIXED_UPVECTOR
float angularSpeed = 0.05f / 180.0f * float(pi);
float theta = dClickX * angularSpeed;
float phi = dClickY * angularSpeed;
const Vector3f viewVec = normalize(g_camLookAt - g_camPos);
float dist = length(g_camLookAt - g_camPos);
const Vector3f dX = normalize(cross(viewVec,g_camUp));
const Vector3f dY = normalize(cross(viewVec,dX));
AffineSpace3f rot_x = AffineSpace3f::rotate(g_camLookAt,dX,phi);
g_camSpace = rot_x * g_camSpace;
g_camSpace = AffineSpace3f::rotate(g_camLookAt,dY,theta) * g_camSpace;
g_camPos = g_camLookAt-dist*xfmVector(g_camSpace,Vector3f(0,0,1));
#else
float angularSpeed = 0.05f / 180.0f * float(pi);
float mapping = 1.0f;
if (g_camUp[1] < 0) mapping = -1.0f;
theta -= mapping * dClickX * angularSpeed;
phi += dClickY * angularSpeed;
if (theta < 0) theta += 2.0f * float(pi);
if (theta > 2.0f*float(pi)) theta -= 2.0f * float(pi);
if (phi < -1.5f*float(pi)) phi += 2.0f*float(pi);
if (phi > 1.5f*float(pi)) phi -= 2.0f*float(pi);
float cosPhi = cosf(phi);
float sinPhi = sinf(phi);
float cosTheta = cosf(theta);
float sinTheta = sinf(theta);
float dist = length(g_camLookAt - g_camPos);
g_camPos = g_camLookAt + dist * Vector3f(cosPhi * sinTheta, -sinPhi, cosPhi * cosTheta);
Vector3f viewVec = normalize(g_camLookAt - g_camPos);
Vector3f approxUp(0.0f, 1.0f, 0.0f);
if (phi < -0.5f*float(pi) || phi > 0.5*float(pi)) approxUp = -approxUp;
Vector3f rightVec = normalize(cross(viewVec, approxUp));
AffineSpace3f rotate = AffineSpace3f::rotate(viewVec, psi);
g_camUp = xfmVector(rotate, cross(rightVec, viewVec));
#endif
}
// Pan camera (MMB + mouse move)
if (mouseMode == 2) {
float panSpeed = 0.00025f;
float dist = length(g_camLookAt - g_camPos);
Vector3f viewVec = normalize(g_camLookAt - g_camPos);
Vector3f strafeVec = cross(g_camUp, viewVec);
Vector3f deltaVec = strafeVec * panSpeed * dist * float(dClickX)
+ g_camUp * panSpeed * dist * float(-dClickY);
g_camPos += deltaVec;
g_camLookAt += deltaVec;
}
// Dolly camera (RMB + mouse move)
if (mouseMode == 3) {
float dollySpeed = 0.01f;
float delta;
if (fabsf(dClickX) > fabsf(dClickY)) delta = float(dClickX);
else delta = float(-dClickY);
float k = powf((1-dollySpeed), delta);
float dist = length(g_camLookAt - g_camPos);
Vector3f viewVec = normalize(g_camLookAt - g_camPos);
g_camPos += dist * (1-k) * viewVec;
}
// Roll camera (ALT + LMB + mouse move)
if (mouseMode == 4) {
float angularSpeed = 0.1f / 180.0f * float(pi);
psi -= dClickX * angularSpeed;
Vector3f viewVec = normalize(g_camLookAt - g_camPos);
Vector3f approxUp(0.0f, 1.0f, 0.0f);
if (phi < -0.5f*float(pi) || phi > 0.5*float(pi)) approxUp = -approxUp;
Vector3f rightVec = normalize(cross(viewVec, approxUp));
AffineSpace3f rotate = AffineSpace3f::rotate(viewVec, psi);
g_camUp = xfmVector(rotate, cross(rightVec, viewVec));
}
g_camSpace = AffineSpace3f::lookAtPoint(g_camPos, g_camLookAt, g_camUp);
g_resetAccumulation = true;
}
