/* render a tile of the grid */
void draw_square(BITMAP *bmp, MATRIX_f *camera, int x, int z)
{
V3D_f v[4];
int c;
/* set up four vertices with the world-space position of the tile */
v[0].x = x - GRID_SIZE/2;
v[0].y = 0;
v[0].z = z - GRID_SIZE/2;
v[1].x = x - GRID_SIZE/2 + TILE_SIZE;
v[1].y = 0;
v[1].z = z - GRID_SIZE/2;
v[2].x = x - GRID_SIZE/2 + TILE_SIZE;
v[2].y = 0;
v[2].z = z - GRID_SIZE/2 + TILE_SIZE;
v[3].x = x - GRID_SIZE/2;
v[3].y = 0;
v[3].z = z - GRID_SIZE/2 + TILE_SIZE;
/* for each vertex... */
for (c=0; c<4; c++) {
/* apply the camera matrix, translating world space -> view space */
apply_matrix_f(camera, v[c].x, v[c].y, v[c].z, &v[c].x, &v[c].y, &v[c].z);
/* reject anything too close to us or behind us. Really this ought
* to do a proper 3d clip, but I have yet to write the code for that :-)
*/
if (v[c].z < 0.01)
return;
/* project view space -> screen space */
persp_project_f(v[c].x, v[c].y, v[c].z, &v[c].x, &v[c].y);
}
if (v[0].c = (((x + z) / TILE_SIZE) & 1)) {
/* every second square */
v[0].c = 1;
v[1].c = 43;
v[2].c = 85;
v[3].c = 127;
}
else {
v[0].c = 127 + 1;
v[1].c = 127 + 43;
v[2].c = 127 + 85;
v[3].c = 127 + 127;
}
/* render the square */
quad3d_f(bmp, POLYTYPE_GCOL, NULL, &v[0], &v[1], &v[2], &v[3]);
}
int main(void)
{
BITMAP *textura, *back_buffer;
int x, y, c; // para rellenar la textura
int tecla;
int nPol;
int i;
char angulo_x = 0, angulo_y = 0, angulo_z = 0;
POLIGONO3D cara[6]; // un cubo
PUNTO3D ver_t[4]; // v‚rtices transformados para un pol¡gono
V3D_f ver_p[4]; // v‚rtices proyectados (2d) para un pol¡gono
PUNTO3D cam_p; // posici¢n de la camara
VECTOR cam_f; // vector frente de la camara
VECTOR cam_a; // vector arriba de la camara
MATRIX_f matriz;
printf("\nEjemplo de c mara en un solo plano.");
printf("\n\nControles:");
printf("\n Flechas: mover la camara.");
printf("\n\n\nPresione una tecla para comenzar...\n");
getch();
// inicializar allegro y otras cosas
allegro_init();
set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0);
install_keyboard();
install_timer();
install_int(&cont_frames, 1000);
LOCK_VARIABLE(nFrames);
LOCK_VARIABLE(nFramesPorSegundo);
LOCK_FUNCTION(cont_frames);
back_buffer = create_bitmap(SCREEN_W, SCREEN_H);
clear(back_buffer);
// crear una textura
textura = create_bitmap(TEX_W, TEX_H);
clear(textura);
c = 1; // color
for(x = 0; x < TEX_W; x++) {
for(y = 0; y < TEX_H; y++) {
putpixel(textura, x, y, c);
if(c++ > 64)
c = 1;
}
}
line(textura, 0, 0, TEX_W, TEX_H, 4);
line(textura, TEX_W, 0, 0, TEX_H, 4);
line(textura, 0, 0, 0, TEX_H, 4);
line(textura, 0, 0, TEX_W, 0, 4);
line(textura, 0, TEX_H - 1, TEX_W - 1, TEX_H - 1, 4);
line(textura, TEX_W - 1, TEX_H - 1, TEX_W - 1, 0, 4);
textprintf(textura, font, 1, 1, 13, "Textura");
// inicializar las coordenadas 3d del cubo
cara[0].ver[0].x = -2;
cara[0].ver[0].y = -2;
cara[0].ver[0].z = -2;
cara[0].ver[1].x = 2;
cara[0].ver[1].y = -2;
cara[0].ver[1].z = -2;
cara[0].ver[2].x = 2;
cara[0].ver[2].y = 2;
cara[0].ver[2].z = -2;
cara[0].ver[3].x = -2;
cara[0].ver[3].y = 2;
cara[0].ver[3].z = -2;
cara[1].ver[0].x = 2;
cara[1].ver[0].y = -2;
cara[1].ver[0].z = 2;
cara[1].ver[1].x = -2;
cara[1].ver[1].y = -2;
cara[1].ver[1].z = 2;
cara[1].ver[2].x = -2;
cara[1].ver[2].y = 2;
cara[1].ver[2].z = 2;
cara[1].ver[3].x = 2;
cara[1].ver[3].y = 2;
cara[1].ver[3].z = 2;
cara[2].ver[0].x = -2;
cara[2].ver[0].y = -2;
cara[2].ver[0].z = 2;
cara[2].ver[1].x = -2;
cara[2].ver[1].y = -2;
cara[2].ver[1].z = -2;
cara[2].ver[2].x = -2;
cara[2].ver[2].y = 2;
cara[2].ver[2].z = -2;
cara[2].ver[3].x = -2;
cara[2].ver[3].y = 2;
cara[2].ver[3].z = 2;
cara[3].ver[0].x = 2;
cara[3].ver[0].y = -2;
cara[3].ver[0].z = -2;
cara[3].ver[1].x = 2;
cara[3].ver[1].y = -2;
cara[3].ver[1].z = 2;
cara[3].ver[2].x = 2;
cara[3].ver[2].y = 2;
cara[3].ver[2].z = 2;
cara[3].ver[3].x = 2;
cara[3].ver[3].y = 2;
cara[3].ver[3].z = -2;
cara[4].ver[0].x = -2;
cara[4].ver[0].y = -2;
cara[4].ver[0].z = 2;
cara[4].ver[1].x = 2;
cara[4].ver[1].y = -2;
cara[4].ver[1].z = 2;
cara[4].ver[2].x = 2;
cara[4].ver[2].y = -2;
cara[4].ver[2].z = -2;
cara[4].ver[3].x = -2;
cara[4].ver[3].y = -2;
cara[4].ver[3].z = -2;
cara[5].ver[0].x = -2;
cara[5].ver[0].y = 2;
cara[5].ver[0].z = -2;
cara[5].ver[1].x = 2;
cara[5].ver[1].y = 2;
cara[5].ver[1].z = -2;
cara[5].ver[2].x = 2;
cara[5].ver[2].y = 2;
cara[5].ver[2].z = 2;
cara[5].ver[3].x = -2;
cara[5].ver[3].y = 2;
cara[5].ver[3].z = 2;
// inicializar las coordenadas de la textura
ver_p[0].u = 0;
ver_p[0].v = 0;
ver_p[1].u = TEX_W;
ver_p[1].v = 0;
ver_p[2].u = TEX_W;
ver_p[2].v = TEX_H;
ver_p[3].u = 0;
ver_p[3].v = TEX_H;
// inicializar c mara
cam_p.x = 0;
cam_p.y = 0;
cam_p.z = -35;
cam_f.x = 0;
cam_f.y = 0;
cam_f.z = 1;
cam_a.x = 0;
cam_a.y = -1;
cam_a.z = 0;
set_projection_viewport(0, 0, SCREEN_W, SCREEN_H);
do {
// teclado
if(key[KEY_RIGHT]) {
get_rotation_matrix_f(&matriz,
0,
-1,
0);
apply_matrix_f(&matriz,
cam_f.x,
cam_f.y,
cam_f.z,
&cam_f.x,
&cam_f.y,
&cam_f.z);
}
if(key[KEY_LEFT]) {
get_rotation_matrix_f(&matriz,
0,
1,
0);
apply_matrix_f(&matriz,
cam_f.x,
cam_f.y,
cam_f.z,
&cam_f.x,
&cam_f.y,
&cam_f.z);
}
if(key[KEY_UP]) {
cam_p.x += cam_f.x;
cam_p.y += cam_f.y;
cam_p.z += cam_f.z;
}
if(key[KEY_DOWN]) {
cam_p.x -= cam_f.x;
cam_p.y -= cam_f.y;
cam_p.z -= cam_f.z;
}
get_camera_matrix_f(&matriz,
cam_p.x,
cam_p.y,
cam_p.z,
cam_f.x,
cam_f.y,
cam_f.z,
cam_a.x,
cam_a.y,
cam_a.z,
32,
1);
for(nPol = 0; nPol < 6; nPol++) { // cada pol¡gono
for(i = 0; i < 4; i++) { // cada v‚rtice del pol¡gono
// transformaci¢n
apply_matrix_f(&matriz,
cara[nPol].ver[i].x,
cara[nPol].ver[i].y,
cara[nPol].ver[i].z,
&ver_t[i].x,
&ver_t[i].y,
&ver_t[i].z);
// proyecci¢n
persp_project_f(ver_t[i].x,
ver_t[i].y,
ver_t[i].z,
&ver_p[i].x,
&ver_p[i].y);
ver_p[i].z = ver_t[i].z; // requerido para renderizar la textura
}
// backface culling
if(polygon_z_normal_f(&ver_p[0], &ver_p[1], &ver_p[2]) > 0) {
quad3d_f(back_buffer,
POLYTYPE_PTEX,
textura,
&ver_p[0],
&ver_p[1],
&ver_p[2],
&ver_p[3]);
}
}
textprintf(back_buffer, font, 0, 190, 2, "%d FPS", nFramesPorSegundo);
blit(back_buffer, screen, 0, 0, 0, 0, SCREEN_W, SCREEN_H);
nFrames++;
clear(back_buffer);
} while(!key[KEY_ESC]);
allegro_exit();
return 0;
}
int main(void)
{
BITMAP *textura, *back_buffer;
int x, y, c; // para rellenar la textura
int tecla;
int nPol;
int i;
char angulo_x = 0, angulo_y = 0, angulo_z = 0;
float trans_z = 12.1;
POLIGONO3D cara[6]; // un cubo
PUNTO3D ver_t[4]; // v‚rtices transformados para un pol¡gono
V3D_f ver_p[4]; // v‚rtices proyectados (2d) para un pol¡gono
MATRIX_f matriz;
printf("\nEjemplo de: backface culling (eliminaci¢n de caras posteriores)");
printf("\n\nControles:");
printf("\n Q, W, flechas = rotar cubo.");
printf("\n A, Z = z++, z--.");
printf("\n\n\nPresione una tecla para comenzar...\n");
getch();
// inicializar allegro y otras cosas
allegro_init();
set_gfx_mode(GFX_AUTODETECT, 320, 200, 0, 0);
install_keyboard();
install_timer();
install_int(&cont_frames, 1000);
LOCK_VARIABLE(nFrames);
LOCK_VARIABLE(nFramesPorSegundo);
LOCK_FUNCTION(cont_frames);
back_buffer = create_bitmap(SCREEN_W, SCREEN_H);
clear(back_buffer);
// crear una textura
textura = create_bitmap(TEX_W, TEX_H);
clear(textura);
c = 1; // color
for(x = 0; x < TEX_W; x++) {
for(y = 0; y < TEX_H; y++) {
putpixel(textura, x, y, c);
if(c++ > 64)
c = 1;
}
}
line(textura, 0, 0, TEX_W, TEX_H, 4);
line(textura, TEX_W, 0, 0, TEX_H, 4);
line(textura, 0, 0, 0, TEX_H, 4);
line(textura, 0, 0, TEX_W, 0, 4);
line(textura, 0, TEX_H - 1, TEX_W - 1, TEX_H - 1, 4);
line(textura, TEX_W - 1, TEX_H - 1, TEX_W - 1, 0, 4);
textprintf(textura, font, 1, 1, 13, "Textura");
// inicializar las coordenadas 3d del cubo
cara[0].ver[0].x = -2;
cara[0].ver[0].y = -2;
cara[0].ver[0].z = -2;
cara[0].ver[1].x = 2;
cara[0].ver[1].y = -2;
cara[0].ver[1].z = -2;
cara[0].ver[2].x = 2;
cara[0].ver[2].y = 2;
cara[0].ver[2].z = -2;
cara[0].ver[3].x = -2;
cara[0].ver[3].y = 2;
cara[0].ver[3].z = -2;
cara[1].ver[0].x = 2;
cara[1].ver[0].y = -2;
cara[1].ver[0].z = 2;
cara[1].ver[1].x = -2;
cara[1].ver[1].y = -2;
cara[1].ver[1].z = 2;
cara[1].ver[2].x = -2;
cara[1].ver[2].y = 2;
cara[1].ver[2].z = 2;
cara[1].ver[3].x = 2;
cara[1].ver[3].y = 2;
cara[1].ver[3].z = 2;
cara[2].ver[0].x = -2;
cara[2].ver[0].y = -2;
cara[2].ver[0].z = 2;
cara[2].ver[1].x = -2;
cara[2].ver[1].y = -2;
cara[2].ver[1].z = -2;
cara[2].ver[2].x = -2;
cara[2].ver[2].y = 2;
cara[2].ver[2].z = -2;
cara[2].ver[3].x = -2;
cara[2].ver[3].y = 2;
cara[2].ver[3].z = 2;
cara[3].ver[0].x = 2;
cara[3].ver[0].y = -2;
cara[3].ver[0].z = -2;
cara[3].ver[1].x = 2;
cara[3].ver[1].y = -2;
cara[3].ver[1].z = 2;
cara[3].ver[2].x = 2;
cara[3].ver[2].y = 2;
cara[3].ver[2].z = 2;
cara[3].ver[3].x = 2;
cara[3].ver[3].y = 2;
cara[3].ver[3].z = -2;
cara[4].ver[0].x = -2;
cara[4].ver[0].y = -2;
cara[4].ver[0].z = 2;
cara[4].ver[1].x = 2;
cara[4].ver[1].y = -2;
cara[4].ver[1].z = 2;
cara[4].ver[2].x = 2;
cara[4].ver[2].y = -2;
cara[4].ver[2].z = -2;
cara[4].ver[3].x = -2;
cara[4].ver[3].y = -2;
cara[4].ver[3].z = -2;
cara[5].ver[0].x = -2;
cara[5].ver[0].y = 2;
cara[5].ver[0].z = -2;
cara[5].ver[1].x = 2;
cara[5].ver[1].y = 2;
cara[5].ver[1].z = -2;
cara[5].ver[2].x = 2;
cara[5].ver[2].y = 2;
cara[5].ver[2].z = 2;
cara[5].ver[3].x = -2;
cara[5].ver[3].y = 2;
cara[5].ver[3].z = 2;
// inicializar las coordenadas de la textura
ver_p[0].u = 0;
ver_p[0].v = 0;
ver_p[1].u = TEX_W;
ver_p[1].v = 0;
ver_p[2].u = TEX_W;
ver_p[2].v = TEX_H;
ver_p[3].u = 0;
ver_p[3].v = TEX_H;
set_projection_viewport(0, 0, SCREEN_W, SCREEN_H);
do {
// teclado
if(key[KEY_UP]) {
angulo_x++;
}
if(key[KEY_DOWN]) {
angulo_x--;
}
if(key[KEY_RIGHT]) {
angulo_y--;
}
if(key[KEY_LEFT]) {
angulo_y++;
}
if(key[KEY_Q]) {
angulo_z++;
}
if(key[KEY_W]) {
angulo_z--;
}
if(key[KEY_A]) {
trans_z+=0.2;
}
if(key[KEY_Z]) {
trans_z-=0.2;
}
get_transformation_matrix_f(&matriz,
1, // escala
angulo_x, // angulo rotaci¢n x
angulo_y, // angulo rotaci¢n y
angulo_z, // angulo rotaci¢n z
0, // translaci¢n x
0, // translaci¢n y
trans_z); // translaci¢n z
for(nPol = 0; nPol < 6; nPol++) { // cada pol¡gono
for(i = 0; i < 4; i++) { // cada v‚rtice del pol¡gono
// transformaci¢n
apply_matrix_f(&matriz,
cara[nPol].ver[i].x,
cara[nPol].ver[i].y,
cara[nPol].ver[i].z,
&ver_t[i].x,
&ver_t[i].y,
&ver_t[i].z);
// proyecci¢n
persp_project_f(ver_t[i].x,
ver_t[i].y,
ver_t[i].z,
&ver_p[i].x,
&ver_p[i].y);
ver_p[i].z = ver_t[i].z; // requerido para renderizar la textura
}
// si la normal al pol¡gono es positiva -> pintar
if(polygon_z_normal_f(&ver_p[0], &ver_p[1], &ver_p[2]) > 0) {
quad3d_f(back_buffer,
POLYTYPE_PTEX,
textura,
&ver_p[0],
&ver_p[1],
&ver_p[2],
&ver_p[3]);
}
}
textprintf(back_buffer, font, 0, 190, 2, "%d FPS", nFramesPorSegundo);
blit(back_buffer, screen, 0, 0, 0, 0, SCREEN_W, SCREEN_H);
nFrames++;
clear(back_buffer);
} while(!key[KEY_ESC]);
allegro_exit();
return 0;
}
void draw_fiend_beam(BITMAP *dest, BITMAP *img, int x1, int y1,int x2, int y2)
{
int i;
V3D_f point[4];
V3D_f temp_point[2];
VERTEX the_point[4];
float angle;
angle = compute_angle(x2,y2,x1,y1);
// set points of a point...
temp_point[0].y = 0;
temp_point[0].x = -img->w/2;
temp_point[1].y = 0;
temp_point[1].x = img->w/2;
//rotate the points
for(i=0;i<2;i++)
{
point[i].x = (temp_point[i].x*COS(angle)-temp_point[i].y*SIN(angle));
point[i].y = (temp_point[i].y*COS(angle)+temp_point[i].x*SIN(angle));
}
//give the other point thses cords...
point[2].x = point[0].x;
point[2].y = point[0].y;
point[3].x = point[1].x;
point[3].y = point[1].y;
//transform to world space..
point[0].x += x1;
point[0].y += y1;
point[1].x += x1;
point[1].y += y1;
point[2].x += x2;
point[2].y += y2;
point[3].x += x2;
point[3].y += y2;
//set the u,v cords (texture cords)
for(i=0;i<4;i++)
point[i].c = makecol(255,0,0);
point[0].u = 0;
point[0].v = 0;
point[1].u = img->w;
point[1].v = 0;
point[2].u = 0;
point[2].v = distance(point[0].x,point[0].y,point[2].x,point[2].y );
point[3].u = img->w;
point[3].v = distance(point[1].x,point[1].y,point[3].x,point[3].y );
for(i=0;i<4;i++)
{
the_point[i].x = point[i].x;
the_point[i].y = point[i].y;
the_point[i].u = point[i].u;
the_point[i].v = point[i].v;
}
quad3d_f(dest,POLYTYPE_ATEX_MASK,img, &point[0], &point[1], &point[3],&point[2] );
//fiend_quad3d(dest,img, &the_point[0], &the_point[1], &the_point[3],&the_point[2] );
//for(i=0;i<4;i++)
//circlefill(dest,point[i].x,point[i].y,3,makecol(255,0,255));
}
