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trezor-pong.c
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/* -------------------------------------------------------------------------- *
* File: trezor-pong.c
* Description: Pong on the Trezor One
* Author: Anthony DeRosa
* Date July 2018
* Acknowledgements: Ported from https:// github.com/flightcrank/pong
* -------------------------------------------------------------------------- */
#include <stdlib.h>
#include <stdio.h>
#include "buttons.h"
#include "usb.h"
#include "oled.h"
#include "trezor-sdl.h"
#define WINNING_SCORE 3
typedef struct ball_s {
int x, y; // position on the screen
int w,h; // ball width and height
int dx, dy; // movement vector
} ball_t;
typedef struct paddle {
int x,y;
int w,h;
} paddle_t;
// asset instances
static ball_t ball;
static paddle_t paddle[2];
static int score[] = {0,0};
static const uint8_t bmp_title_data[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x01, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x03, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x03, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x03, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x03, 0xf8, 0x00, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x03, 0xf8, 0x00, 0x78, 0x03, 0xff, 0xff, 0xe0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0,
0x03, 0xf8, 0x00, 0x78, 0x07, 0xff, 0xff, 0xf0, 0x0f, 0xff, 0xff, 0xe0, 0x0f, 0xff, 0xff, 0xc0,
0x03, 0xf8, 0x00, 0x78, 0x07, 0xff, 0xff, 0xf0, 0x0f, 0xff, 0xff, 0xe0, 0x1f, 0xff, 0xff, 0xc0,
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0x03, 0xff, 0x80, 0x00, 0x07, 0xfc, 0x00, 0xf0, 0x0f, 0xf0, 0x01, 0xe0, 0x1f, 0xf0, 0x03, 0xc0,
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0x03, 0xff, 0x80, 0x00, 0x07, 0xff, 0x00, 0xf0, 0x0f, 0xfc, 0x01, 0xe0, 0x1f, 0xfc, 0x03, 0xc0,
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};
static const uint8_t bmp_game_over_data[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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};
static const BITMAP bmp_title = {128, 64, bmp_title_data};
static const BITMAP bmp_game_over = {128, 64, bmp_game_over_data};
SDL_Surface screen = {
.w = OLED_HEIGHT,
.h = OLED_WIDTH
};
// initialize starting position and sizes of game elemements
static void
init_ball(void) {
ball.x = screen.w / 2;
ball.y = screen.h / 2;
ball.w = 1;
ball.h = 1;
ball.dy = 1;
ball.dx = 1;
paddle[0].x = 2;
paddle[0].y = screen.h / 2 - 5;
paddle[0].w = 1;
paddle[0].h = 15;
paddle[1].x = screen.w - 2 - 1;
paddle[1].y = screen.h / 2 - 5;
paddle[1].w = 1;
paddle[1].h = 15;
}
static int
check_score(void) {
int i;
// loop through player scores
for(i = 0; i < 2; i++) {
// check if score is @ the score win limit
if (score[i] == WINNING_SCORE ) {
// reset scores
score[0] = 0;
score[1] = 0;
// return 1 if player 1 score @ limit
if (i == 0) {
return 1;
// return 2 if player 2 score is @ limit
} else {
return 2;
}
}
}
// return 0 if no one has reached a score of WINNING_SCORE yet
return 0;
}
// if return value is 1 collision occured. if return is 0, no collision.
static int
check_collision(ball_t a, paddle_t b) {
int left_a, left_b;
int right_a, right_b;
int top_a, top_b;
int bottom_a, bottom_b;
left_a = a.x;
right_a = a.x + a.w;
top_a = a.y;
bottom_a = a.y + a.h;
left_b = b.x;
right_b = b.x + b.w;
top_b = b.y;
bottom_b = b.y + b.h;
if (left_a > right_b) {
return 0;
}
if (right_a < left_b) {
return 0;
}
if (top_a > bottom_b) {
return 0;
}
if (bottom_a < top_b) {
return 0;
}
return 1;
}
/* This routine moves each ball by its motion vector. */
static void
move_ball(void) {
/* Move the ball by its motion vector. */
ball.x += ball.dx;
ball.y += ball.dy;
/* Turn the ball around if it hits the edge of the screen. */
if (ball.x < 0) {
score[1] += 1;
init_ball();
}
if (ball.x > screen.w - 1) {
score[0] += 1;
init_ball();
}
if (ball.y < 0 || ball.y > screen.h - 1) {
ball.dy = -ball.dy;
}
// check for collision with the paddle
int i;
for (i = 0; i < 2; i++) {
int c = check_collision(ball, paddle[i]);
// collision detected
if (c == 1) {
// ball moving left
if (ball.dx < 0) {
ball.dx -= 1;
// ball moving right
} else {
ball.dx += 1;
}
// change ball direction
ball.dx = -ball.dx;
// change ball angle based on where on the paddle it hit
int hit_pos = (paddle[i].y + paddle[i].h) - ball.y;
if (hit_pos >= 0 && hit_pos < 1) {
ball.dy = 4;
}
if (hit_pos >= 1 && hit_pos < 2) {
ball.dy = 3;
}
if (hit_pos >= 2 && hit_pos < 4) {
ball.dy = 2;
}
if (hit_pos >= 4 && hit_pos < 6) {
ball.dy = 1;
}
if (hit_pos >= 6 && hit_pos < 9) {
ball.dy = 0;
}
if (hit_pos >= 9 && hit_pos < 11) {
ball.dy = -1;
}
if (hit_pos >= 11 && hit_pos < 13) {
ball.dy = -2;
}
if (hit_pos >= 13 && hit_pos < 14) {
ball.dy = -3;
}
if (hit_pos >= 14 && hit_pos <= 15) {
ball.dy = -4;
}
// ball moving right
if (ball.dx > 0) {
// teleport ball to avoid mutli collision glitch
if (ball.x < 1) {
ball.x = 1;
}
// ball moving left
} else {
// teleport ball to avoid mutli collision glitch
if (ball.x > 127) {
ball.x = 127;
}
}
}
}
}
static void
move_paddle_ai(void) {
int center = paddle[0].y;
int screen_center = screen.h / 2;
int ball_speed = ball.dy;
if (ball_speed < 0) {
ball_speed = -ball_speed;
}
// ball moving right
if (ball.dx > 0) {
// return to center position
if (center < screen_center) {
paddle[0].y += ball_speed;
} else {
paddle[0].y -= ball_speed;
}
// ball moving left
} else {
// ball moving down
if (ball.dy > 0) {
if (ball.y > center) {
paddle[0].y += ball_speed;
} else {
paddle[0].y -= ball_speed;
}
}
// ball moving up
if (ball.dy < 0) {
if (ball.y < center) {
paddle[0].y -= ball_speed;
} else {
paddle[0].y += ball_speed;
}
}
// ball moving stright across
if (ball.dy == 0) {
if (ball.y < center) {
paddle[0].y -= 5;
} else {
paddle[0].y += 5;
}
}
}
}
static void
move_paddle(int d) {
// if the down arrow is pressed move paddle down
if (d == 0) {
if(paddle[1].y >= screen.h - paddle[1].h) {
paddle[1].y = screen.h - paddle[1].h;
} else {
paddle[1].y += 5;
}
}
// if the up arrow is pressed move paddle up
if (d == 1) {
if(paddle[1].y <= 0) {
paddle[1].y = 0;
} else {
paddle[1].y -= 5;
}
}
}
static void
draw_game_over(int p) {
char *winner;
if (p == 2)
{
winner = "Player 1 wins!";
}
else
{
winner = "Computer wins!";
}
oledDrawBitmap(0, 0, &bmp_game_over);
oledDrawStringCenter(8, winner, FONT_STANDARD);
oledDrawStringCenter(OLED_HEIGHT - 8, "Press any button to begin!", FONT_STANDARD);
return;
}
static void
draw_menu(void) {
oledDrawBitmap(0, 0, &bmp_title);
oledDrawStringCenter(OLED_HEIGHT - 8, "Press any button to begin!", FONT_STANDARD);
return;
}
static void
draw_background(void) {
SDL_Rect src;
// draw bg with net
src.x = 0;
src.y = 0;
src.w = screen.w;
src.h = screen.h;
// draw the backgorund
int r = SDL_FillRect(&screen,&src,0);
if (r !=0){
printf("fill rectangle faliled in func draw_background()");
}
}
static void
draw_net(void) {
SDL_Rect net;
net.x = screen.w / 2;
net.y = 2;
net.w = 1;
net.h = 5;
// draw the net
int i,r;
for(i = 0; i < 12; i++) {
r = SDL_FillRect(&screen,&net,255);
if (r != 0) {
printf("fill rectangle faliled in func draw_background()");
}
net.y = net.y + 5;
}
}
static void
draw_ball(void) {
SDL_Rect src;
src.x = ball.x;
src.y = ball.y;
src.w = ball.w;
src.h = ball.h;
int r = SDL_FillRect(&screen,&src,255);
if (r !=0){
printf("fill rectangle faliled in func drawball()");
}
}
void
draw_paddle(void) {
SDL_Rect src;
int i;
for (i = 0; i < 2; i++) {
src.x = paddle[i].x;
src.y = paddle[i].y;
src.w = paddle[i].w;
src.h = paddle[i].h;
int r = SDL_FillRect(&screen,&src,255);
if (r !=0){
printf("fill rectangle faliled in func draw_paddle()");
}
}
}
static void
draw_player_0_score(void) {
char scoreStr[2] = {0};
scoreStr[0] = (char)(score[0] + 0x30);
scoreStr[1] = '\0';
oledDrawString(screen.w/2 - 20 - fontCharWidth(FONT_STANDARD, scoreStr[0]), 0, scoreStr, FONT_STANDARD);
}
static void
draw_player_1_score(void) {
char scoreStr[2] = {0};
scoreStr[0] = (char)(score[1] + 0x30);
scoreStr[1] = '\0';
oledDrawString(screen.w/2 + 20, 0, scoreStr, FONT_STANDARD);
}
int
pong_main(void) {
/* Initialize the ball position data. */
init_ball();
Uint32 next_game_tick = SDL_GetTicks();
int state = 0;
int r = 0;
int quit = 0;
int sleep = 0;
/* Animate */
while (quit == 0) {
sleep = 50;
buttonUpdate();
if (button.NoUp)
{
move_paddle(0);
}
else if(button.YesUp)
{
move_paddle(1);
}
// draw the background
draw_background();
draw_net();
// display main menu
if (state == 0 ) {
if (button.NoUp || button.YesUp)
{
state = 1;
}
// draw menu
draw_menu();
// display gameover
} else if (state == 2) {
if (button.NoDown && button.YesDown)
{
state = 0;
// delay for a little bit so the space bar press dosnt get triggered twice
// while the main menu is showing
SDL_Delay(500);
}
// display gameover
draw_game_over(r);
if (button.NoUp || button.YesUp)
{
state = 1;
}
// display the game
} else if (state == 1){
// check score
r = check_score();
if (r == 1) {
state = 2;
} else if (r == 2){
state = 2;
}
// paddle ai movement
move_paddle_ai();
/* Move the balls for the next frame. */
move_ball();
// draw net
draw_net();
// draw paddles
draw_paddle();
/* Put the ball on the screen. */
draw_ball();
// draw the score
draw_player_0_score();
// draw the score
draw_player_1_score();
}
/* Ask SDL to update the entire screen. */
SDL_Flip(&screen);
next_game_tick += 1000 / 10;
sleep = next_game_tick - SDL_GetTicks();
if( sleep >= 0 )
{
SDL_Delay(sleep);
}
}
return 0;
}