void
mMotion(int x, int y)
{
bool_t changed = true;
int dx = x - mouseX;
int dy = y - mouseY;
if(dx == 0 && dy == 0)
return;
if(rButtonDown)
{
if(abs(dy) > abs(dx)) {
zoomFactor -= dy/100.0;
if(zoomFactor < 0.5) zoomFactor = 0.5;
}
changed = true;
}
mouseX = x;
mouseY = y;
if(changed) {
if(ortho)
setup_ortho_matrix();
else
setup_projection_matrix();
glutPostRedisplay();
}
}
void clear()
// Clear the drawing surface and initialize viewing parameters.
{
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL);
glDrawBuffer(GL_BACK);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Set up the projection and view matrices.
// Projection matrix.
glMatrixMode(GL_PROJECTION);
setup_projection_matrix(window_width, window_height, horizontal_fov_degrees);
// View matrix.
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
view.m_matrix.View(viewer_dir, viewer_up, viewer_pos);
apply_matrix(view.m_matrix);
// Transform the frustum planes from view coords into world coords.
int i;
for (i = 0; i < 6; i++) {
// Rotate the plane from view coords into world coords. I'm pretty sure this is not a slick
// way to do this :)
plane_info& tp = view.m_frustum[i];
plane_info& p = frustum_plane[i];
view.m_matrix.ApplyInverseRotation(&tp.normal, p.normal);
vec3 v;
view.m_matrix.ApplyInverse(&v, p.normal * p.d);
tp.d = v * tp.normal;
}
// Enable z-buffer.
glDepthFunc(GL_LEQUAL); // smaller z gets priority
// Turn on back-face culling.
glFrontFace(GL_CCW);
glEnable(GL_CULL_FACE);
// Set the wireframe state.
if (wireframe_mode) {
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
} else {
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
}
void setup_view(float nearz, float farz)
{
// Set up the projection and view matrices.
// Projection matrix.
glMatrixMode(GL_PROJECTION);
setup_projection_matrix(window_width, window_height, horizontal_fov_degrees, nearz, farz);
// View matrix.
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
s_view.m_matrix.set_view(viewer_dir, viewer_up, viewer_pos);
apply_matrix(s_view.m_matrix);
// Transform the frustum planes from view coords into world coords.
int i;
for (i = 0; i < 6; i++) {
// Rotate the plane from view coords into world coords. I'm pretty sure this is not a slick
// way to do this :)
plane_info& tp = s_view.m_frustum[i];
plane_info& p = frustum_plane[i];
s_view.m_matrix.apply_inverse_rotation(&tp.normal, p.normal);
vec3 v;
s_view.m_matrix.apply_inverse(&v, p.normal * p.d);
tp.d = v * tp.normal;
}
// Enable z-buffer.
glDepthFunc(GL_LEQUAL); // smaller z gets priority
// Turn on back-face culling.
glFrontFace(GL_CCW);
glEnable(GL_CULL_FACE);
// Set the wireframe state.
if (wireframe_mode) {
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
} else {
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
}
void
keyboard(unsigned char key, int x, int y)
{
switch(key)
{
// textures
case 'c':
break;
case 'v':
break;
case 'n':
break;
case 'b':
break;
// clipping plane
case 'a': // near clipping plane away from eye
break;
case 'z': // near clipping plane closer to eye
break;
case 'k': // far clipping plane away from eye
break;
case 'm': // move the far clipping plane closer to eye
break;
// shading
case 'f': // flat shading
break;
case 'g': // gouraud shading
break;
// general
case '1': // window 256 x 256
glutReshapeWindow(256, 256);
break;
case '2': // window 512 x 512
glutReshapeWindow(512, 512);
break;
case '3': // window 1024 x 1024
glutReshapeWindow(1024, 1024);
break;
case 's': // save to ppm
exportPPM();
break;
case 'o': // orthogonal projection
//zoomFactor=1.0f;
setup_ortho_matrix();
ortho=true;
break;
case 'p': // perspective projectection
//zoomFactor=1.0f;
setup_projection_matrix();
ortho=false;
break;
case 27:
case 'q': // quit
glutDestroyWindow(win);
exit(0);
}
glutPostRedisplay();
}
void
keyboard(unsigned char key, int x, int y)
{
switch(key)
{
case '1': // window 256 x 256
glutReshapeWindow(256, 256);
break;
case '2': // window 512 x 512
glutReshapeWindow(512, 512);
break;
case '3': // window 1024 x 1024
glutReshapeWindow(1024, 1024);
break;
case 's': // save to ppm
exportPPM();
break;
case '5':
// eye loc (25, 25, 0)
// coi (-25, 25, 0)
eye[0] = 25.0f; eye[1] = 25.0f; eye[2] = 0.0f;
coi[0] = -25.0f; coi[1] = 25.0f; coi[2] = 0.0f;
face=2;
flip=-1;
break;
case '6':
// eye loc (0, 25, 25)
// coi (0, 25, -25)
eye[0] = 0.0f; eye[1] = 25.0f; eye[2] = 25.0f;
coi[0] = 0.0f; coi[1] = 25.0f; coi[2] = -25.0f;
face=0;
flip=1;
break;
case '7':
// eye loc (-25, 25, 0)
// coi (25, 25, 0)
eye[0] = -25.0f; eye[1] = 25.0f; eye[2] = 0.0f;
coi[0] = 25.0f; coi[1] = 25.0f; coi[2] = 0.0f;
face=2;
flip=1;
break;
case '8':
// eye loc (0, 25, -25)
// coi (0, 25, 25)
eye[0] = 0.0f; eye[1] = 25.0f; eye[2] = -25.0f;
coi[0] = 0.0f; coi[1] = 25.0f; coi[2] = 25.0f;
face=0;
flip=-1;
break;
case 'd': // cam left 5
if(eye[0 + face] != -25 * flip)
eye[0 + face] -= flip * 5;
break;
case 'g': // cam right 5
if(eye[0 + face] != 25 * flip)
eye[0 + face] += flip * 5;
break;
case 'r': // cam up 5
if(eye[1] != 25)
eye[1] += 5;
break;
case 'f': // cam down 5
if(eye[1] != 0)
eye[1] -= 5;
break;
case 'j': // coi left 5
if(coi[0+face] != -25 * flip)
coi[0+face] -= flip * 5;
break;
case 'l': // coi right 5
if(coi[0+face] != 25 * flip)
coi[0+face] += flip * 5;
break;
case 'i': // coi up 5
if(coi[1] == 0)
{
moveUp();
} else if(coi[1] != 50)
coi[1] += 5;
break;
case 'k': // coi down 5 or along the ground plane
if(coi[1] == 0 && bottom)
{
moveDown();
bottom=true;
} else if(coi[1] != 0)
coi[1] -= 5;
break;
case 'b': // move eye and coi left 5, if no bound restrictions
if((coi[0 + face] != -25 * flip && eye[0 + face] != -25 * flip)) {
coi[0 + face] -= flip * 5;
eye[0 + face] -= flip * 5;
}
break;
case 'm': // move eye and coi right 5, if no bound restrictions
if((coi[0 + face] != 25 * flip && eye[0 + face] != 25 * flip)) {
coi[0 + face] += flip * 5;
eye[0 + face] += flip * 5;
}
break;
case 'h': // move eye and coi up 5, if no bound restrictions
if((coi[1] != 50 && eye[1] != 50)) {
coi[1] += 5;
eye[1] += 5;
}
break;
case 'n': // move eye and coi down 5, if no bound restrictions
if((coi[1] != 0 && eye[1] != 0)) {
coi[1] -= 5;
eye[1] -= 5;
}
break;
case '.': // rotate cam up-vector clockwise 5 degrees
rAng += 5;
up[1] = cos(rAng * M_PI*2/360);
up[0] = sin(rAng * M_PI*2/360);
break;
case ',': // rotate cam up-vector counter-clockwise 5 degrees
rAng -= 5;
up[1] = cos(rAng * M_PI*2/360);
up[0] = sin(rAng * M_PI*2/360);
break;
case 'o': // orthogonal projection
zoomFactor=1.0f;
setup_ortho_matrix();
ortho=true;
break;
case 'p': // perspective projectection
zoomFactor=1.0f;
setup_projection_matrix();
ortho=false;
break;
case 'w': // wireframe
wireframe = wireframe == true ? false : true;
glPolygonMode(GL_FRONT_AND_BACK, wireframe == true ? GL_LINE : GL_FILL);
break;
case 'a': // show location of coi
if(pointer)
pointer=false;
else
pointer=true;
break;
case 'z': // hidden surface removeal
depth = depth == true ? false : true;
if(depth) glEnable(GL_DEPTH_TEST);
else glDisable(GL_DEPTH_TEST);
break;
case 'x': // back face culling
culling = culling == true ? false : true;
if(culling) glDisable(GL_CULL_FACE);
else glEnable(GL_CULL_FACE);
break;
case 'c': // draw imaginary bounding box
if(bounding_box)
bounding_box=false;
else
bounding_box=true;
break;
case 27:
case 'q': // quit
glutDestroyWindow(win);
exit(0);
}
glutPostRedisplay();
}
