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examples/game/01-snake: Remove RNG abstraction.

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This commit is contained in:
Ryan C. Gordon 2024-08-30 17:13:51 -04:00
parent 29b9b163b9
commit c38d3f0fe4
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GPG Key ID: FA148B892AB48044
1 changed files with 12 additions and 14 deletions
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26
examples/game/01-snake/snake.c
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@ -53,8 +53,6 @@ typedef struct
unsigned occupied_cells;
} SnakeContext;
typedef Sint32 (SDLCALL *RandFunc)(Sint32 n);
typedef struct
{
SDL_Window *window;
@ -94,11 +92,11 @@ static int are_cells_full_(SnakeContext *ctx)
return ctx->occupied_cells == SNAKE_GAME_WIDTH * SNAKE_GAME_HEIGHT;
}
static void new_food_pos_(SnakeContext *ctx, RandFunc rand)
static void new_food_pos_(SnakeContext *ctx)
{
while (SDL_TRUE) {
const char x = (char) rand(SNAKE_GAME_WIDTH);
const char y = (char) rand(SNAKE_GAME_HEIGHT);
const char x = (char) SDL_rand(SNAKE_GAME_WIDTH);
const char y = (char) SDL_rand(SNAKE_GAME_HEIGHT);
if (snake_cell_at(ctx, x, y) == SNAKE_CELL_NOTHING) {
put_cell_at_(ctx, x, y, SNAKE_CELL_FOOD);
break;
@ -106,7 +104,7 @@ static void new_food_pos_(SnakeContext *ctx, RandFunc rand)
}
}
void snake_initialize(SnakeContext *ctx, RandFunc rand)
void snake_initialize(SnakeContext *ctx)
{
int i;
SDL_zeroa(ctx->cells);
@ -117,7 +115,7 @@ void snake_initialize(SnakeContext *ctx, RandFunc rand)
--ctx->occupied_cells;
put_cell_at_(ctx, ctx->tail_xpos, ctx->tail_ypos, SNAKE_CELL_SRIGHT);
for (i = 0; i < 4; i++) {
new_food_pos_(ctx, rand);
new_food_pos_(ctx);
++ctx->occupied_cells;
}
}
@ -142,7 +140,7 @@ static void wrap_around_(char *val, char max)
}
}
void snake_step(SnakeContext *ctx, RandFunc rand)
void snake_step(SnakeContext *ctx)
{
const SnakeCell dir_as_cell = (SnakeCell)(ctx->next_dir + 1);
SnakeCell ct;
@ -194,17 +192,17 @@ void snake_step(SnakeContext *ctx, RandFunc rand)
/* Collisions */
ct = snake_cell_at(ctx, ctx->head_xpos, ctx->head_ypos);
if (ct != SNAKE_CELL_NOTHING && ct != SNAKE_CELL_FOOD) {
snake_initialize(ctx, rand);
snake_initialize(ctx);
return;
}
put_cell_at_(ctx, prev_xpos, prev_ypos, dir_as_cell);
put_cell_at_(ctx, ctx->head_xpos, ctx->head_ypos, dir_as_cell);
if (ct == SNAKE_CELL_FOOD) {
if (are_cells_full_(ctx)) {
snake_initialize(ctx, rand);
snake_initialize(ctx);
return;
}
new_food_pos_(ctx, rand);
new_food_pos_(ctx);
++ctx->inhibit_tail_step;
++ctx->occupied_cells;
}
@ -229,7 +227,7 @@ static int handle_key_event_(SnakeContext *ctx, SDL_Scancode key_code)
return SDL_APP_SUCCESS;
/* Restart the game as if the program was launched. */
case SDL_SCANCODE_R:
snake_initialize(ctx, SDL_rand);
snake_initialize(ctx);
break;
/* Decide new direction of the snake. */
case SDL_SCANCODE_RIGHT:
@ -297,7 +295,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
return SDL_APP_FAILURE;
}
snake_initialize(&as->snake_ctx, SDL_rand);
snake_initialize(&as->snake_ctx);
as->step_timer = SDL_AddTimer(STEP_RATE_IN_MILLISECONDS, sdl_timer_callback_, NULL);
if (as->step_timer == 0) {
@ -314,7 +312,7 @@ SDL_AppResult SDL_AppEvent(void *appstate, const SDL_Event *event)
case SDL_EVENT_QUIT:
return SDL_APP_SUCCESS;
case SDL_EVENT_USER:
snake_step(ctx, SDL_rand);
snake_step(ctx);
break;
case SDL_EVENT_KEY_DOWN:
return handle_key_event_(ctx, event->key.scancode);