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spaceship use bitmap #429

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cf00590
less memory
SoluMilken Aug 10, 2025
b073b27
update due to John's comments
SoluMilken Aug 21, 2025
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1 change: 1 addition & 0 deletions fw/Core/Hitcon/App/MainMenuApp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ using hitcon::app::tetris::tetris_app;

constexpr menu_entry_t main_menu_entries[] = {
// TODO : change app
{"Spaceship", &spaceship_app, nullptr},
{"Hacker Pet", &tama_app, &hitcon::app::tama::SetSingleplayer},
{"Snake", &snake_app, &hitcon::app::snake::SetSingleplayer},
{"Tetris", &tetris_app, &hitcon::app::tetris::SetSingleplayer},
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105 changes: 50 additions & 55 deletions fw/Core/Hitcon/App/SpaceshipApp.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,6 @@
#include <Service/Sched/Scheduler.h>
#include <Util/uint_to_str.h>

#include <algorithm>

using namespace hitcon::service::sched;
using hitcon::game::EventType;

Expand All @@ -29,7 +27,7 @@ void SpaceshipApp::Init() { scheduler.Queue(&_routine_task, nullptr); }
// 1. OnEntry: menu -> ready
void SpaceshipApp::OnEntry() {
_state = INIT;
display_set_mode_scroll_text("Ready...");
> display_set_mode_scroll_text("Ready...");
}
// 2. OnExit
void SpaceshipApp::OnExit() {
Expand All @@ -42,8 +40,6 @@ void SpaceshipApp::OnExit() {
void SpaceshipApp::OnButton(button_t button) {}
// 4. OnEdgeButton
void SpaceshipApp::OnEdgeButton(button_t button) {
constexpr int last_row = DISPLAY_WIDTH * (DISPLAY_HEIGHT - 2);

if ((button & BUTTON_VALUE_MASK) == BUTTON_BACK) {
badge_controller.BackToMenu(this);
return;
Expand All @@ -52,15 +48,17 @@ void SpaceshipApp::OnEdgeButton(button_t button) {
if (_state == RUN) {
switch (button & BUTTON_VALUE_MASK) {
case BUTTON_DOWN: // move _my_position down
if (_my_position < last_row) _SyncMyPlane(_my_position + DISPLAY_WIDTH);
if (_my_position < PLANE_UPPER_BOUND) {
_SyncMyPlane(_my_position << 1);
}
break;
case BUTTON_UP: // move _my_position up
if (_my_position > DISPLAY_WIDTH)
_SyncMyPlane(_my_position - DISPLAY_WIDTH);
if (_my_position > PLANE_LOWER_BOUND) {
_SyncMyPlane(_my_position >> 1);
}
break;
case BUTTON_RIGHT: // emit bullet
_bullets[_num_bullets] = _my_position + 2;
_num_bullets += 1;
_bullets[2] |= _my_position;
break;
default:
break;
Expand All @@ -76,14 +74,18 @@ void SpaceshipApp::OnEdgeButton(button_t button) {

void SpaceshipApp::_StartGame() {
// setup my plane
_SyncMyPlane(DISPLAY_WIDTH);
_my_plane[2] = {0};
_my_position = 0;
_SyncMyPlane(PLANE_LOWER_BOUND);
// setup enemy
_enemy_position[DISPLAY_WIDTH] = {0};
_GenerateEnemy();
_has_enemy = true;
// setup bullets
_num_bullets = 0;
// setup score
_score = 0;
// setup bullets
_bullets[DISPLAY_WIDTH] = {0};
// setup display
_frame_buf[DISPLAY_WIDTH] = {0};
// setup state
_state = RUN;
scheduler.EnablePeriodic(&_routine_task);
Expand All @@ -105,83 +107,76 @@ void SpaceshipApp::Routine(void* unused) {

// render current status
_Render();

// move on
// ## 1. move all bullets to right
_MoveBulletsToRight();
// ## 2. generate enemy or move enemy to left
if (_has_enemy) {
_enemy_position -= 1;
} else {
_GenerateEnemy();
_has_enemy = true;
}
_MoveEnemyToLeft();
if (!_has_enemy) _GenerateEnemy();
}

void SpaceshipApp::_SyncMyPlane(uint8_t new_position) {
if (new_position != _my_position) {
_my_position = new_position;
_my_plane[0] = _my_position;
_my_plane[1] = _my_position + 1;
_my_plane[2] = _my_position - DISPLAY_WIDTH;
_my_plane[3] = _my_position + DISPLAY_WIDTH;
_my_plane[0] = _my_position | _my_position << 1 | _my_position >> 1;
_my_plane[1] = _my_position;
}
}

void SpaceshipApp::_Render() {
uint8_t frame_buf[DISPLAY_HEIGHT * DISPLAY_WIDTH] = {0};
// ## 1. render plane
for (uint8_t i = 0; i < 4; i++) {
frame_buf[_my_plane[i]] = 1;
}
// ## 2. render enemy
frame_buf[_enemy_position] = 1;
// ## 3. render bullets
for (uint8_t i = 0; i < _num_bullets; i++) {
frame_buf[_bullets[i]] = 1;
for (uint8_t i = 0; i < DISPLAY_WIDTH; i++) {
_frame_buf[i] = _enemy_position[i] | _bullets[i];
if (i < 2) {
_frame_buf[i] |= _my_plane[i];
}
}
display_set_mode_fixed(frame_buf);
display_set_mode_fixed_packed(_frame_buf);
}

void SpaceshipApp::_CheckCollision() {
for (uint8_t i = 0; i < 4; i++) {
if (_my_plane[i] == _enemy_position) {
for (uint8_t i = 0; i < 2; i++) {
if ((_my_plane[i] & _enemy_position[i]) != 0) {
_state = GAME_OVER; // game over!
break;
}
}
}

void SpaceshipApp::_UpdateScoreBullets() {
uint8_t left_bullets = 0;
for (uint8_t i = 0; i < _num_bullets; i++) {
if (_bullets[i] == _enemy_position) {
for (uint8_t i = 0; i < DISPLAY_WIDTH; i++) {
if ((_bullets[i] & _enemy_position[i]) != 0) {
_score += 1;
_bullets[i] &= ~_enemy_position[i]; // remove bullet
_enemy_position[i] = 0; // remove enemy
_has_enemy = false;
// this bullet is used.
} else {
_bullets[left_bullets] = _bullets[i];
left_bullets += 1;
break;
}
}
_num_bullets = left_bullets; // update _num_bullets
}

void SpaceshipApp::_MoveBulletsToRight() {
uint8_t left_bullets = 0;
for (uint8_t i = 0; i < _num_bullets; i++) {
_bullets[i] += 1;
if (_bullets[i] % DISPLAY_WIDTH > 0) { // check bullet within region
_bullets[left_bullets] = _bullets[i];
left_bullets += 1;
}
// bullets stay in column 2 to column DISPLAY_WIDTH-1
for (uint8_t i = DISPLAY_WIDTH - 1; i >= 2; i--) {
_bullets[i] = _bullets[i - 1];
}
_num_bullets = left_bullets; // update _num_bullets
}

void SpaceshipApp::_GenerateEnemy() {
uint8_t row = g_fast_random_pool.GetRandom() % (DISPLAY_HEIGHT - 2);
_enemy_position = (row + 2) * DISPLAY_WIDTH - 1;
_enemy_position[DISPLAY_WIDTH - 1] = 1 << (row + 1);
_has_enemy = true;
}

void SpaceshipApp::_MoveEnemyToLeft() {
if (!_has_enemy) return;
_has_enemy = false;
for (uint8_t i = 0; i < (DISPLAY_WIDTH - 1); i++) {
_enemy_position[i] = _enemy_position[i + 1];
_enemy_position[i + 1] = 0;
if (_enemy_position[i] > 0) {
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@john0312 john0312 Aug 23, 2025

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nit: Best to use != 0 for bitfield checks

_has_enemy = true;
}
}
}

} // namespace spaceship
Expand Down
17 changes: 10 additions & 7 deletions fw/Core/Hitcon/App/SpaceshipApp.h
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Expand Up @@ -16,26 +16,29 @@ enum state_t { INIT, RUN, GAME_OVER, END };

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@john0312 john0312 Aug 20, 2025

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You might want to static_assert() on the display height.

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@SoluMilken SoluMilken Aug 21, 2025

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Can I use

static constexpr unsigned PLANE_UPPER_BOUND = 1 << (DISPLAY_HEIGHT-2);

instead of using

static_assert(DISPLAY_HEIGHT==8)

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@john0312 john0312 Aug 23, 2025

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The reason why you need static_assert() is because you used a byte to represent a column, which is 8 pixels currently. Whenever that changes your code will break, and we'll want to warn anyone of that using static_assert().

class SpaceshipApp : public App {
private:
// interval for bullet and enemy moving
static constexpr unsigned INTERVAL = 350;
static_assert(DISPLAY_HEIGHT) static constexpr unsigned INTERVAL = 350;
static constexpr unsigned PLANE_LOWER_BOUND = 1 << 1;
static constexpr unsigned PLANE_UPPER_BOUND = 1 << (DISPLAY_HEIGHT - 2);

PeriodicTask _routine_task;
uint8_t _my_position = 0;
uint8_t _my_plane[4];
uint8_t _enemy_position;
uint8_t _my_position;
uint8_t _my_plane[2];
uint8_t _enemy_position[DISPLAY_WIDTH];
bool _has_enemy;
uint32_t _score;
uint8_t _state;

// handle bullets
uint8_t _num_bullets;
uint8_t _bullets[DISPLAY_HEIGHT * DISPLAY_WIDTH]; // 0: head
uint8_t _bullets[DISPLAY_WIDTH];
// for display
uint8_t _frame_buf[DISPLAY_WIDTH];

void Routine(void* unused);
void _StartGame();
void _GenerateEnemy();
void _Render();
void _SyncMyPlane(uint8_t new_position);
void _MoveEnemyToLeft();
void _MoveBulletsToRight();
void _CheckCollision();
void _UpdateScoreBullets();
Expand Down