flappychik

commit 9077f846501611f1de029fc430a3a6df72c2cbfa
parent 70b5024d4ab531a17bab3837403b112aabb989de
Author: bsandro <brian.drosan@gmail.com>
Date:   Fri, 25 Mar 2022 01:15:12 +0200

Scrolling background; drawing rectangles attempt.

Diffstat:
M
main.c
 | 
50
++++++++++++++++++++++++++++++++++++++++++++++++--

1 file changed, 48 insertions(+), 2 deletions(-)
diff --git a/main.c b/main.c
@@ -16,6 +16,10 @@
 #define GAME_WIN_HEIGHT 600
 #define GAME_FPS 60
 #define GAME_FALL_ACCEL 0.85 // pixels per second^2 essentially
+#define GAME_BG_SCROLL_VELOCITY 0.3
+#define GAME_SCROLL_VELOCITY 0.4
+#define GAME_COLUMN_WIDTH 80
+#define GAME_COLUMN_HEIGHT 200
 
 enum game_state_t { GAME_STATE_INIT, GAME_STATE_RUNNING, GAME_STATE_OVER };
 
@@ -35,6 +39,9 @@ struct game_t {
 	uint64_t last_frame;
 	struct sprite_t bg;
 	struct sprite_t ship;
+	int bg_x;
+	SDL_Rect *columns;
+	int columns_count;
 };
 
 struct menu_t {
@@ -47,8 +54,10 @@ struct menu_t {
 void draw_game(uint64_t ftime, struct game_t *game) {
 	game->ship.velocity += game->ship.accel * ftime;
 	game->ship.rect.y += (ftime * game->ship.velocity / 1000.0);
+	int bg_offset = ftime * GAME_BG_SCROLL_VELOCITY; // background position offset
+	game->bg_x = (game->bg_x - bg_offset) % game->bg.rect.w; // can be only %width max
 
-	if (game->ship.rect.y >= game->scrH) {
+	if (game->ship.rect.y >= game->scrH) { // falling beyond the playing area (screen)
 		game->state = GAME_STATE_INIT;
 	}
 
@@ -62,7 +71,7 @@ void draw_game(uint64_t ftime, struct game_t *game) {
 	SDL_RenderClear(game->renderer);
 
 	// tile background to whole screen area
-	for (int bg_x = 0; bg_x < game->scrW; bg_x += game->bg.rect.w) {
+	for (int bg_x = game->bg_x; bg_x < game->scrW; bg_x += game->bg.rect.w) {
 		for (int bg_y = 0; bg_y < game->scrH; bg_y += game->bg.rect.h) {
 			game->bg.rect.x = bg_x;
 			game->bg.rect.y = bg_y;
@@ -70,6 +79,10 @@ void draw_game(uint64_t ftime, struct game_t *game) {
 		}
 	}
 
+	// columns
+	SDL_SetRenderDrawColor(game->renderer, 0, 154, 213, 0);
+	SDL_RenderFillRects(game->renderer, game->columns, game->columns_count);
+
 	SDL_RenderCopyEx(game->renderer, game->ship.texture, NULL, &game->ship.rect, game->ship.angle, NULL, SDL_FLIP_NONE);
 	SDL_RenderPresent(game->renderer);
 
@@ -77,6 +90,8 @@ void draw_game(uint64_t ftime, struct game_t *game) {
 }
 
 void draw_menu(struct menu_t *menu) {
+	SDL_SetRenderDrawColor(menu->game->renderer, 2, 40, 223, 0);
+
 	if (menu->surface == NULL) {
 		SDL_Color color = { 255, 255, 255, 0 };
 		menu->surface = TTF_RenderText_Solid(menu->font, "Press <space> to play", color);
@@ -96,6 +111,31 @@ void draw_menu(struct menu_t *menu) {
 	SDL_RenderPresent(menu->game->renderer);
 }
 
+void create_columns(SDL_Rect **rects, int count) {
+	assert(count > 0);
+	assert(*rects == NULL);
+	*rects = calloc(count, sizeof(SDL_Rect));
+	assert(*rects != NULL);
+}
+
+void init_columns(SDL_Rect **columns, int count, int hidpi_scale) {
+	assert(count > 0);
+	for (int i = 0; i < count; ++i) {
+		SDL_Rect *column = *columns + i;
+		column->w = GAME_COLUMN_WIDTH * hidpi_scale;
+		column->h = GAME_COLUMN_HEIGHT * hidpi_scale;
+		column->x = 200 * i;
+		column->y = 0;
+	}
+}
+
+void destroy_columns(SDL_Rect **rects) {
+	assert(rects != NULL);
+	assert(*rects != NULL);
+	free(*rects);
+	*rects = NULL;
+}
+
 int main(int argc, char *argv[]) {
 	(void)argc;
 	(void)argv;
@@ -143,6 +183,11 @@ int main(int argc, char *argv[]) {
 	game.bg.rect.h *= hidpi_scale;
 	game.ship.accel = GAME_FALL_ACCEL;
 
+	// "enemy" columns
+	game.columns_count = 2; // max columns on screen
+	create_columns(&game.columns, game.columns_count);
+	init_columns(&game.columns, game.columns_count, hidpi_scale);
+
 	// menu
 	struct menu_t menu = {0};
 	menu.game = &game;
@@ -188,6 +233,7 @@ int main(int argc, char *argv[]) {
 	}
 
 	// cleanup
+	destroy_columns(&game.columns);
 	TTF_CloseFont(menu.font);
 	SDL_DestroyTexture(game.bg.texture);
 	SDL_DestroyTexture(game.ship.texture);