/* get_camera_matrix_f:
* Floating point version of get_camera_matrix().
*/
void get_camera_matrix_f(MATRIX_f *m, float x, float y, float z, float xfront, float yfront, float zfront, float xup, float yup, float zup, float fov, float aspect)
{
MATRIX_f camera, scale;
float xside, yside, zside, width, d;
ASSERT(m);
/* make 'in-front' into a unit vector, and negate it */
normalize_vector_f(&xfront, &yfront, &zfront);
xfront = -xfront;
yfront = -yfront;
zfront = -zfront;
/* make sure 'up' is at right angles to 'in-front', and normalize */
d = dot_product_f(xup, yup, zup, xfront, yfront, zfront);
xup -= d * xfront;
yup -= d * yfront;
zup -= d * zfront;
normalize_vector_f(&xup, &yup, &zup);
/* calculate the 'sideways' vector */
cross_product_f(xup, yup, zup, xfront, yfront, zfront, &xside, &yside, &zside);
/* set matrix rotation parameters */
camera.v[0][0] = xside;
camera.v[0][1] = yside;
camera.v[0][2] = zside;
camera.v[1][0] = xup;
camera.v[1][1] = yup;
camera.v[1][2] = zup;
camera.v[2][0] = xfront;
camera.v[2][1] = yfront;
camera.v[2][2] = zfront;
/* set matrix translation parameters */
camera.t[0] = -(x*xside + y*yside + z*zside);
camera.t[1] = -(x*xup + y*yup + z*zup);
camera.t[2] = -(x*xfront + y*yfront + z*zfront);
/* construct a scaling matrix to deal with aspect ratio and FOV */
width = floattan(64.0 - fov/2);
get_scaling_matrix_f(&scale, width, -aspect*width, -1.0);
/* combine the camera and scaling matrices */
matrix_mul_f(&camera, &scale, m);
}
/* get_vector_rotation_matrix_f:
* Floating point version of get_vector_rotation_matrix().
*/
void get_vector_rotation_matrix_f(MATRIX_f *m, float x, float y, float z, float a)
{
float c, s, cc;
ASSERT(m);
FLOATSINCOS(a, s, c);
cc = 1 - c;
normalize_vector_f(&x, &y, &z);
m->v[0][0] = (cc * x * x) + c;
m->v[0][1] = (cc * x * y) + (z * s);
m->v[0][2] = (cc * x * z) - (y * s);
m->v[1][0] = (cc * x * y) - (z * s);
m->v[1][1] = (cc * y * y) + c;
m->v[1][2] = (cc * z * y) + (x * s);
m->v[2][0] = (cc * x * z) + (y * s);
m->v[2][1] = (cc * y * z) - (x * s);
m->v[2][2] = (cc * z * z) + c;
m->t[0] = m->t[1] = m->t[2] = 0;
}
int main()
{
/* Setup Allegro/AllegroGL */
if (allegro_init())
return 1;
if (install_allegro_gl())
return 1;
if (install_keyboard() < 0)
{
allegro_message("Unable to install keyboard\n");
return 1;
}
if (install_mouse() == -1)
{
allegro_message("Unable to install mouse\n");
return 1;
}
if (install_timer() < 0)
{
allegro_message("Unable to install timers\n");
return 1;
}
/* lock timer */
LOCK_VARIABLE(rotation_counter);
LOCK_FUNCTION(rotation_counter_handler);
/* set desktop resolution */
DESKTOP_W = GetSystemMetrics(SM_CXVIRTUALSCREEN);
DESKTOP_H = GetSystemMetrics(SM_CYVIRTUALSCREEN);
/* get monitor resolution/count */
int monitor_count;
MONITOR *monitors = get_monitors(&monitor_count);
/* generate point data */
PLACE places[POINT_COUNT];
int c;
for (c = 1; c < POINT_COUNT - 1; c++)
{
places[c].x = sin((M_PI * (GLfloat)c) / 10.0f) * 200.0f;
places[c].y = cos((M_PI * (GLfloat)c) / 10.0f) * 200.0f;
}
places[0].x = 0.01;
places[0].y = 200.0f;
places[POINT_COUNT - 1].x = 0.01;
places[POINT_COUNT - 1].y = -200.0f;
/* setup display */
allegro_gl_set(AGL_Z_DEPTH, 8);
allegro_gl_set(AGL_COLOR_DEPTH, 16);
allegro_gl_set(AGL_SUGGEST, AGL_Z_DEPTH | AGL_COLOR_DEPTH);
glDepthFunc(GL_LEQUAL);
if (set_gfx_mode(GFX_OPENGL_WINDOWED_BORDERLESS, DESKTOP_W, DESKTOP_H, 0, 0)) {
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("Unable to set graphic mode\n%s\n", allegro_error);
return 1;
}
/* move window so it covers the desktop */
position_window(0, 0);
/* fake information to use if only 1 monitor */
MONITOR fake = {0, 512, 512, 512};
/* setup lighting model */
glShadeModel(GL_FLAT);
glEnable(GL_LIGHT0);
glEnable(GL_COLOR_MATERIAL);
GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
GLfloat ambient[] = { 0.1f, 0.1f, 0.1f };
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
int selected = -1; /* the point currently being moved */
GLfloat rotation[3] = {0, 0, 0}; /* the rotation of the mesh */
install_int(rotation_counter_handler, 20); /* install the rotation handler */
/* enter main program loop */
while(!key[KEY_ESC])
{
while (rotation_counter > 0)
{
/* rotate the mesh */
rotation[0] += M_PI / 24.0f;
rotation[1] += M_PI / 16.0f;
rotation[2] += M_PI / 8.0f;
rotation_counter--;
}
/* clear the buffers */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* process monitor 0 */
MONITOR *m = &monitors[0];
/* adjust mouse so its relative to the monitor */
int mx = (mouse_x - m->x) - (m->w / 2);
int my = (mouse_y - m->y) - (m->h / 2);
/* if the left mouse is pushed, find a close point */
if (mouse_b & 1)
{
if (selected == -1)
{
GLfloat distance = 10;
for (c = 0; c < POINT_COUNT; c++)
{
GLfloat dx = mx - places[c].x;
GLfloat dy = my - places[c].y;
GLfloat d = sqrt(dx * dx + dy * dy);
if (d < distance)
{
distance = d;
selected = c;
}
}
}
}
else
selected = -1;
/* move selected point */
if (selected >= 0)
{
places[selected].x = mx;
places[selected].y = my;
}
/* center the viewport on monitor */
glViewport(m->x, DESKTOP_H - m->h - m->y, m->w, m->h);
/* setup viewport projection */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-m->w / 2, m->w / 2, m->h / 2, -m->h / 2);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* draw points */
glColor3ub(0, 255, 0);
glBegin(GL_LINE_STRIP);
for (c = 0; c < POINT_COUNT; c++)
{
glVertex2f(places[c].x, places[c].y);
}
glEnd();
glColor3ub(255, 255, 255);
for (c = 0; c < POINT_COUNT; c++)
{
draw_square(places[c].x, places[c].y, 10);
}
/* draw vertical line */
glBegin(GL_LINE_STRIP);
glVertex2f(0.0f, -m->h);
glVertex2f(0.0f, m->h);
glEnd();
/* draw the mouse */
glColor3ub(255, 255, 255);
draw_square(mx, my, 20);
/* process viewport 1 */
/* select second monitor */
if (monitor_count > 1)
{
/* if 2nd monitor exists use it */
m = &monitors[1];
}
else
{
/* use fake monitor */
m = &fake;
}
/* adjust mouse so its relative to the monitor*/
mx = (mouse_x - m->x) - (m->w / 2);
my = (mouse_y - m->y) - (m->h / 2);
/* center the viewport on the monitor*/
glViewport(m->x, DESKTOP_H - m->h - m->y, m->w, m->h);
/* setup viewport projection */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, (float)m->w / (float)m->h, 0.1f, 2000.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* turn on lighting and depth testing */
glEnable(GL_LIGHTING);
glEnable(GL_DEPTH_TEST);
/* move mesh so its visible */
glTranslatef(0.0f, 0.0f, -1000.0f);
/* rotate mesh */
glRotatef(rotation[0], 1.0f, 0.0f, 0.0f);
glRotatef(rotation[1], 0.0f, 1.0f, 0.0f);
glRotatef(rotation[2], 0.0f, 0.0f, 1.0f);
GLfloat p1[3] = {0, 0, 0};
GLfloat p2[3] = {0, 0, 0};
GLfloat p3[3] = {0, 0, 0};
GLfloat p4[3] = {0, 0, 0};
GLfloat vec1[3];
GLfloat vec2[3];
GLfloat normal[3];
/* draw mesh to screen */
glColor3ub(0, 255, 0);
for (c = 0; c < (POINT_COUNT - 1); c++)
{
GLfloat a1 = 0;
GLfloat a2 = M_PI / 16.0f;
GLfloat d1 = places[c].x;
GLfloat d2 = places[c + 1].x;
p1[0] = sin(a1) * d1; p1[1] = places[c].y; p1[2] = cos(a1) * d1;
p2[0] = sin(a2) * d1; p2[1] = places[c].y; p2[2] = cos(a2) * d1;
p3[0] = sin(a2) * d2; p3[1] = places[c + 1].y; p3[2] = cos(a2) * d2;
p4[0] = sin(a1) * d2; p4[1] = places[c + 1].y; p4[2] = cos(a1) * d2;
buildVector(vec1, p1, p2);
buildVector(vec2, p1, p4);
cross_product_f(vec2[0], vec2[1], vec2[2], vec1[0], vec1[1], vec1[2], &normal[0], &normal[1], &normal[2]);
normalize_vector_f(&normal[0], &normal[1], &normal[2]);
glBegin(GL_QUAD_STRIP);
glNormal3fv(normal);
glVertex3fv(p1);
glVertex3fv(p4);
int s = 0;
for (s = 1; s < 32; s++)
{
a2 = (M_PI * (GLfloat)(s + 1)) / 16.0f;
d1 = places[c].x;
d2 = places[c + 1].x;
copyPoint(p1, p2);
copyPoint(p4, p3);
p2[0] = sin(a2) * d1; p2[1] = places[c].y; p2[2] = cos(a2) * d1;
p3[0] = sin(a2) * d2; p3[1] = places[c + 1].y; p3[2] = cos(a2) * d2;
buildVector(vec1, p1, p2);
buildVector(vec2, p1, p4);
cross_product_f(vec2[0], vec2[1], vec2[2], vec1[0], vec1[1], vec1[2], &normal[0], &normal[1], &normal[2]);
normalize_vector_f(&normal[0], &normal[1], &normal[2]);
glNormal3fv(normal);
glVertex3fv(p2);
glVertex3fv(p3);
}
glEnd();
}
/* turn off lighting and depth testing */
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
/* if not using the fake monitor */
if (m != &fake)
{
/* setup viewport projection */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-m->w / 2, m->w / 2, m->h / 2, -m->h / 2);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* draw the mouse */
glColor3ub(255, 255, 255);
draw_square(mx, my, 20);
}
/* flip the contents to the screen */
allegro_gl_flip();
}
free(monitors);
return 0;
}
