void
screen_display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
drawmodel();
glutSwapBuffers();
}
void
screen_display(void)
{
GLfloat pos[4], lKa[4], lKd[4], lKs[4];
GLfloat dir[3], mKa[4], mKd[4], mKs[4], mKe[4];
GLfloat lmKa[4];
cell_vector(pos, light_pos, 4);
cell_vector(lKa, light_Ka, 4);
cell_vector(lKd, light_Kd, 4);
cell_vector(lKs, light_Ks, 4);
cell_vector(dir, spot_direction, 3);
cell_vector(mKa, material_Ka, 4);
cell_vector(mKd, material_Kd, 4);
cell_vector(mKs, material_Ks, 4);
cell_vector(mKe, material_Ke, 4);
cell_vector(lmKa, lmodel_Ka, 4);
glLightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER, local_viewer.value);
glLightModelf(GL_LIGHT_MODEL_TWO_SIDE, two_side.value);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmKa);
glLightfv(GL_LIGHT0, GL_POSITION, pos);
glLightfv(GL_LIGHT0, GL_AMBIENT, lKa);
glLightfv(GL_LIGHT0, GL_DIFFUSE, lKd);
glLightfv(GL_LIGHT0, GL_SPECULAR, lKs);
glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, dir);
glLighti(GL_LIGHT0, GL_SPOT_EXPONENT, (int)spot_exponent.value);
if (spot_cutoff.value > 90)
glLighti(GL_LIGHT0, GL_SPOT_CUTOFF, 180);
else
glLighti(GL_LIGHT0, GL_SPOT_CUTOFF, (int)spot_cutoff.value);
glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, Kc.value);
glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, Kl.value);
glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, Kq.value);
glMaterialfv(GL_FRONT, GL_AMBIENT, mKa);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mKd);
glMaterialfv(GL_FRONT, GL_SPECULAR, mKs);
glMaterialfv(GL_FRONT, GL_EMISSION, mKe);
glMaterialf(GL_FRONT, GL_SHININESS, material_Se.value);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(spin_y, 1.0, 0.0, 0.0);
glRotatef(spin_x, 0.0, 1.0, 0.0);
glGetDoublev(GL_MODELVIEW_MATRIX, modelview);
if (pmodel)
drawmodel();
else
glutSolidTorus(0.25, 0.75, 28, 28);
glPopMatrix();
#if 0
#define TESS 20
glNormal3f(0.0, 1.0, 0.0);
for (i = 0; i < TESS; i++) {
glBegin(GL_TRIANGLE_STRIP);
for (j = 0; j <= TESS; j++) {
glVertex3f(-1+(float)i/TESS*2, -1.0, -1+(float)j/TESS*2);
glVertex3f(-1+(float)(i+1)/TESS*2, -1.0, -1+(float)j/TESS*2);
}
glEnd();
}
#endif
glutSwapBuffers();
}
void
world_display(void)
{
GLfloat light_pos[] = { 0.0, 0.0, 1.0, 0.0 };
double length;
float l[3];
l[0] = lookat[3].value - lookat[0].value;
l[1] = lookat[4].value - lookat[1].value;
l[2] = lookat[5].value - lookat[2].value;
length = normalize(l);
invert(modelview, inverse);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (world_draw) {
glEnable(GL_LIGHTING);
glPushMatrix();
glMultMatrixd(inverse);
glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
glPopMatrix();
drawmodel();
glDisable(GL_LIGHTING);
}
glPushMatrix();
glMultMatrixd(inverse);
glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
/* draw the axis and eye vector */
glPushMatrix();
glColor3ub(0, 0, 255);
glBegin(GL_LINE_STRIP);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, -1.0*length);
glVertex3f(0.1, 0.0, -0.9*length);
glVertex3f(-0.1, 0.0, -0.9*length);
glVertex3f(0.0, 0.0, -1.0*length);
glVertex3f(0.0, 0.1, -0.9*length);
glVertex3f(0.0, -0.1, -0.9*length);
glVertex3f(0.0, 0.0, -1.0*length);
glEnd();
glColor3ub(255, 255, 0);
glRasterPos3f(0.0, 0.0, -1.1*length);
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, 'e');
glColor3ub(255, 0, 0);
glScalef(0.4, 0.4, 0.4);
drawaxes();
glPopMatrix();
invert(projection, inverse);
glMultMatrixd(inverse);
/* draw the viewing frustum */
glColor3f(0.2, 0.2, 0.2);
glBegin(GL_QUADS);
glVertex3i(1, 1, 1);
glVertex3i(-1, 1, 1);
glVertex3i(-1, -1, 1);
glVertex3i(1, -1, 1);
glEnd();
glColor3ub(128, 196, 128);
glBegin(GL_LINES);
glVertex3i(1, 1, -1);
glVertex3i(1, 1, 1);
glVertex3i(-1, 1, -1);
glVertex3i(-1, 1, 1);
glVertex3i(-1, -1, -1);
glVertex3i(-1, -1, 1);
glVertex3i(1, -1, -1);
glVertex3i(1, -1, 1);
glEnd();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4f(0.2, 0.2, 0.4, 0.5);
glBegin(GL_QUADS);
glVertex3i(1, 1, -1);
glVertex3i(-1, 1, -1);
glVertex3i(-1, -1, -1);
glVertex3i(1, -1, -1);
glEnd();
glDisable(GL_BLEND);
glPopMatrix();
glutSwapBuffers();
}
void
world_display(void)
{
double length;
float l[3];
GLfloat pos[4], lKa[4], lKd[4], lKs[4];
GLfloat dir[3], mKa[4], mKd[4], mKs[4], mKe[4];
GLfloat lmKa[4];
cell_vector(pos, light_pos, 4);
cell_vector(lKa, light_Ka, 4);
cell_vector(lKd, light_Kd, 4);
cell_vector(lKs, light_Ks, 4);
cell_vector(dir, spot_direction, 3);
cell_vector(mKa, material_Ka, 4);
cell_vector(mKd, material_Kd, 4);
cell_vector(mKs, material_Ks, 4);
cell_vector(mKe, material_Ke, 4);
cell_vector(lmKa, lmodel_Ka, 4);
glLightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER, local_viewer.value);
glLightModelf(GL_LIGHT_MODEL_TWO_SIDE, two_side.value);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmKa);
glMaterialfv(GL_FRONT, GL_AMBIENT, mKa);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mKd);
glMaterialfv(GL_FRONT, GL_SPECULAR, mKs);
glMaterialfv(GL_FRONT, GL_EMISSION, mKe);
glMaterialf(GL_FRONT, GL_SHININESS, material_Se.value);
glLightfv(GL_LIGHT0, GL_AMBIENT, lKa);
glLightfv(GL_LIGHT0, GL_DIFFUSE, lKd);
glLightfv(GL_LIGHT0, GL_SPECULAR, lKs);
glLighti(GL_LIGHT0, GL_SPOT_EXPONENT, (int)spot_exponent.value);
if (spot_cutoff.value > 90)
glLighti(GL_LIGHT0, GL_SPOT_CUTOFF, 180);
else
glLighti(GL_LIGHT0, GL_SPOT_CUTOFF, (int)spot_cutoff.value);
glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, Kc.value);
glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, Kl.value);
glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, Kq.value);
l[0] = at[0] - eye[0];
l[1] = at[1] - eye[1];
l[2] = at[2] - eye[2];
invert(modelview, inverse);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glMultMatrixd(inverse);
glTranslatef(l[0], l[1], l[2]);
glColor3fv(lKd);
glBegin(GL_LINE_STRIP);
if (spot_cutoff.value > 90)
glVertex3f(0, 0, 0);
else
glVertex3f(pos[0]+spot_direction[0].value,
pos[1]+spot_direction[1].value,
pos[2]+spot_direction[2].value);
if (pos[3] == 0) /* 10.0 = 'infinite' light */
glVertex3f(pos[0]*10.0,pos[1]*10.0,pos[2]*10.0);
else
glVertex3f(pos[0], pos[1], pos[2]);
glEnd();
glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, dir);
glLightfv(GL_LIGHT0, GL_POSITION, pos);
glPopMatrix();
length = normalize(l);
if (world_draw) {
glEnable(GL_LIGHTING);
if (pmodel)
drawmodel();
else
glutSolidTorus(0.25, 0.75, 28, 28);
glDisable(GL_LIGHTING);
}
#if 0
#define TESS 20
glNormal3f(0.0, 1.0, 0.0);
for (i = 0; i < TESS; i++) {
glBegin(GL_TRIANGLE_STRIP);
for (j = 0; j <= TESS; j++) {
glVertex3f(-1+(float)i/TESS*2, -1.0, -1+(float)j/TESS*2);
glVertex3f(-1+(float)(i+1)/TESS*2, -1.0, -1+(float)j/TESS*2);
}
glEnd();
}
#endif
glPushMatrix();
glMultMatrixd(inverse);
/* draw the axis and eye vector */
glPushMatrix();
glColor3ub(0, 0, 255);
glBegin(GL_LINE_STRIP);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, -1.0*length);
glVertex3f(0.1, 0.0, -0.9*length);
glVertex3f(-0.1, 0.0, -0.9*length);
glVertex3f(0.0, 0.0, -1.0*length);
glVertex3f(0.0, 0.1, -0.9*length);
glVertex3f(0.0, -0.1, -0.9*length);
glVertex3f(0.0, 0.0, -1.0*length);
glEnd();
glColor3ub(255, 255, 0);
glRasterPos3f(0.0, 0.0, -1.1*length);
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, 'e');
glColor3ub(255, 0, 0);
glScalef(0.4, 0.4, 0.4);
drawaxes();
glPopMatrix();
invert(projection, inverse);
glMultMatrixd(inverse);
/* draw the viewing frustum */
glColor3f(0.2, 0.2, 0.2);
glBegin(GL_QUADS);
glVertex3i(1, 1, 1);
glVertex3i(-1, 1, 1);
glVertex3i(-1, -1, 1);
glVertex3i(1, -1, 1);
glEnd();
glColor3ub(128, 196, 128);
glBegin(GL_LINES);
glVertex3i(1, 1, -1);
glVertex3i(1, 1, 1);
glVertex3i(-1, 1, -1);
glVertex3i(-1, 1, 1);
glVertex3i(-1, -1, -1);
glVertex3i(-1, -1, 1);
glVertex3i(1, -1, -1);
glVertex3i(1, -1, 1);
glEnd();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4f(0.2, 0.2, 0.4, 0.5);
glBegin(GL_QUADS);
glVertex3i(1, 1, -1);
glVertex3i(-1, 1, -1);
glVertex3i(-1, -1, -1);
glVertex3i(1, -1, -1);
glEnd();
glDisable(GL_BLEND);
glPopMatrix();
glutSwapBuffers();
}
