void Renderer::setupProjection(ALLEGRO_TRANSFORM *m)
{
int dw = al_get_display_width(dpy_);
int dh = al_get_display_height(dpy_);
// al_perspective_transform(m, -180 * dw / dh, -180, 1,
// 180 * dw / dh, 180, 1000);
// al_perspective_transform(m, -500, -500, 1,
// 500, 500, 10000);
double zNear = 0.5, zFar = 1000.0, fov = 90.0, aspect = dw / dh;
double left, right;
double bottom, top;
top = tan (fov*ALLEGRO_PI/360.0)*zNear;
bottom = -top;
left = aspect*bottom;
right = aspect*top;
//NBT_Debug("rect: %f %f %f %f", left, top, right, bottom);
al_perspective_transform(m, left, top, zNear,
right, bottom, zFar);
al_set_projection_transform(dpy_, m);
}
/** Updates the camera. */
Camera * camera_update(Camera * self, double dt) {
ALLEGRO_DISPLAY *display = al_get_current_display();
double dw = al_get_display_width(display);
double dh = al_get_display_height(display);
double f = tan(self->field_of_view / 2.0);
/* Set up orthograĥic transform for UI, etc. */
al_identity_transform(&self->orthographic_transform);
al_orthographic_transform(&self->orthographic_transform, 0, 0, -1, dw, dh, 1000);
/* Perspective transform for the main screen 3D view. */
al_identity_transform(&self->perspective_transform);
/* Back up camera a bit. */
/* Set up a nice 3D view. */
al_translate_transform_3d(&self->perspective_transform, 0, 0, -1);
al_perspective_transform(&self->perspective_transform,
-1 * dw / dh * f, f, 1, f * dw / dh, -f, 1000);
/* al_perspective_transform(&projection, -1 * dw / dh * f, f,
1,
f * dw / dh, -f, 1000);
*/
/* Set up the camera's position and view transform. */
/* al_build_camera_transform(&self->camera_transform,
self->position.x, self->position.y, self->position.z,
self->look.x , self->look.y , self->look.z ,
self->up.x , self->up.y , self->up.z );
*/
al_identity_transform(&self->camera_transform);
al_translate_transform_3d(&self->camera_transform,
self->position.x, self->position.y, self->position.z);
al_rotate_transform_3d(&self->camera_transform, 0, -1, 0, self->alpha);
al_rotate_transform_3d(&self->camera_transform, -1, 0, 0, self->theta);
/* Finally move at the set speed. */
self->position = vec3d_add(self->position, vec3d_mul(self->speed, dt));
return self;
}
void setup_projection()
{
// setup the render settings
al_set_render_state(ALLEGRO_DEPTH_TEST, 1);
al_set_render_state(ALLEGRO_WRITE_MASK, ALLEGRO_MASK_DEPTH | ALLEGRO_MASK_RGBA);
al_clear_depth_buffer(1);
ALLEGRO_TRANSFORM t;
camera.reverse_position_transform(&t);
float aspect_ratio = (float)al_get_bitmap_height(backbuffer_sub_bitmap) / al_get_bitmap_width(backbuffer_sub_bitmap);
al_perspective_transform(&t, -1, aspect_ratio, 1, 1, -aspect_ratio, 1000);
//al_set_target_bitmap(backbuffer_sub_bitmap); << I don't think this is necessairy, it also occours just prior to this function
al_use_projection_transform(&t);
}
void set_projection(ALLEGRO_BITMAP *bitmap, ALLEGRO_TRANSFORM *t)
{
float aspect_ratio = (float)al_get_bitmap_height(bitmap) / al_get_bitmap_width(bitmap);
al_perspective_transform(t, -1, aspect_ratio, 1, 1, -aspect_ratio, 100);
al_use_projection_transform(t);
}
int main(void) {
ALLEGRO_VERTEX v[8];
ALLEGRO_DISPLAY * display;
ALLEGRO_TRANSFORM perst;
ALLEGRO_TRANSFORM camt;
ALLEGRO_BITMAP * texture, * texture2;
ALLEGRO_EVENT_QUEUE * queue;
ALLEGRO_EVENT event;
ALLEGRO_FONT * font;
int busy = 1;
float cx = 0;
float cy = -2; // 128;
float cz = 0;
int face = 0;
int hori = 0;
float angle = 0;
float theta = 0;
float near = 2;
float far = 8192;
float zoom = 1;
float scale = 1.0;
float us = 20;
float ratio = 480.0 / 640.0;
al_init();
al_init_image_addon();
al_init_font_addon();
al_install_keyboard();
font = al_create_builtin_font();
queue = al_create_event_queue();
al_set_new_display_option(ALLEGRO_DEPTH_SIZE, 16, ALLEGRO_SUGGEST);
display = al_create_display(640, 480);
al_register_event_source(queue, al_get_keyboard_event_source());
texture = al_load_bitmap("tile_1.png");
texture2 = al_load_bitmap("tile_2.png");
/* Allegro coordinates: +Y is down, +X is to the right,
* and +Z comes "out of" the screen.
*
*/
while (busy) {
init_vertex(v+0, 0, 0, 0, 0, 0, 1, 0, 0, 1);
init_vertex(v+1, 0, 0, us, 0, 256, 0, 1, 0, 1);
init_vertex(v+2, us, 0, us, 256, 256, 0, 0, 1, 1);
init_vertex(v+3, us, 0, 0, 256, 0, 1, 1, 0, 1);
init_vertex(v+4, us, -us, 0, 256, 256, 1, 0, 1, 1);
init_vertex(v+5, 0, -us, 0, 256, 0, 0, 1, 1, 1);
init_vertex(v+6, 0, -us, us, 256, 256, 0, 0, 0, 1);
init_vertex(v+7, 0, 0, us, 0, 256, 1, 1, 1, 1);
al_identity_transform(&camt);
al_scale_transform_3d(&camt, scale, scale, scale);
al_translate_transform_3d(&camt, cx, cy, cz);
angle = face * 0.125 * ALLEGRO_PI;
al_rotate_transform_3d(&camt, 0, -1, 0, angle);
theta = hori * 0.125 * ALLEGRO_PI;
al_rotate_transform_3d(&camt, -1, 0, 0, theta);
al_use_transform(&camt);
// al_set_projection_transform(display, &perst);
al_clear_to_color(al_map_rgb_f(0.75, 0.75, 0.95));
al_set_render_state(ALLEGRO_DEPTH_TEST, 1);
al_clear_depth_buffer(far);
al_identity_transform(&perst);
al_perspective_transform(&perst, -1, ratio, near,
1, -ratio, far);
al_use_projection_transform(&perst);
al_draw_filled_rectangle(0, 0, 4, 5, al_map_rgb_f(0, 0.25, 0.25));
al_draw_prim(v, NULL, texture, 0, 8, ALLEGRO_PRIM_TRIANGLE_FAN);
draw_textured_colored_rectangle_3d(0 , -us, 0, us, us, 0,
1.0, 1.0, texture2, al_map_rgb_f(1,1,1));
draw_textured_colored_rectangle_3d(0 , -us, 0, 0, us, us,
1.0, 1.0, texture2, al_map_rgb_f(1,1,1));
draw_textured_colored_rectangle_3d(0 , 0, 0, us, 0, us,
1.0, 1.0, texture2, al_map_rgb_f(1,1,1));
al_identity_transform(&perst);
al_orthographic_transform(&perst, 0, 0, -1.0, 640, 480, 1.0);
al_identity_transform(&camt);
al_use_projection_transform(&perst);
al_use_transform(&camt);
al_draw_filled_rectangle(111, 22, 133, 44, al_map_rgb_f(0.25, 0.25, 0));
al_draw_multiline_textf(font, al_map_rgb_f(1,1,1), 10, 10, 620, 0, 0,
"Coords: (%f %f %f)\nAngle: (%f %f)\nView: [%f %f %f %f]\nScale: %f",
cx, cy, cz, angle, theta, near, far, zoom, scale);
al_flip_display();
al_wait_for_event(queue, &event);
if (event.type == ALLEGRO_EVENT_KEY_DOWN) {
switch (event.keyboard.keycode) {
case ALLEGRO_KEY_RIGHT:
cx += 8;
break;
case ALLEGRO_KEY_LEFT:
cx -= 8;
break;
case ALLEGRO_KEY_UP:
cy += 8;
break;
case ALLEGRO_KEY_DOWN:
cy -= 8;
break;
case ALLEGRO_KEY_HOME:
cz += 8;
break;
case ALLEGRO_KEY_END:
cz -= 8;
break;
case ALLEGRO_KEY_R:
face++;
break;
case ALLEGRO_KEY_L:
face--;
break;
case ALLEGRO_KEY_H:
hori++;
break;
case ALLEGRO_KEY_G:
hori--;
break;
case ALLEGRO_KEY_N:
near *= 2.0;
break;
case ALLEGRO_KEY_M:
near /= 2.0;
break;
case ALLEGRO_KEY_F:
far += 64;
break;
case ALLEGRO_KEY_V:
far -= 64;
break;
case ALLEGRO_KEY_Z:
zoom *= 2.0f;
break;
case ALLEGRO_KEY_S:
zoom /= 2.0f;
break;
case ALLEGRO_KEY_A:
scale *= 2.0f;
break;
case ALLEGRO_KEY_Q:
scale /= 2.0f;
break;
case ALLEGRO_KEY_ESCAPE:
busy = 0 ;
break;
default:
break;
}
}
}
al_destroy_bitmap(texture);
al_destroy_bitmap(texture2);
return 0;
}
