flappychik

commit e1bbf72e9fb81a2a9b3babda3cd8de069f6d54f1
parent b2c903946a4853d4f92408f0ad1695e085539559
Author: bsandro <brian.drosan@gmail.com>
Date:   Fri, 18 Mar 2022 01:51:40 +0200

falling + bouncing on <space> key; basic game over support

Diffstat:
M
main.c
 | 
52
+++++++++++++++++++++++++++++++++++++++-------------

1 file changed, 39 insertions(+), 13 deletions(-)
diff --git a/main.c b/main.c
@@ -11,20 +11,22 @@
 #define WINDOW_FLAGS SDL_WINDOW_OPENGL | SDL_WINDOW_ALLOW_HIGHDPI
 #endif
 
-#define GAME_WIN_WIDTH 640
-#define GAME_WIN_HEIGHT 480
+#define GAME_WIN_WIDTH 800
+#define GAME_WIN_HEIGHT 600
 #define GAME_FPS 60
-#define GAME_SPEED 80 // pixels per second
 
 struct sprite_t {
 	SDL_Texture *texture;
 	SDL_Rect rect;
-	int angle;
+	int angle; // rotation in degrees
+	double velocity;
+	double accel;
 };
 
 struct game_t {
 	bool over;
 	SDL_Window *screen;
+	int scrW, scrH;
 	SDL_Renderer *renderer;
 	uint64_t last_frame;
 	struct sprite_t bg;
@@ -32,15 +34,31 @@ struct game_t {
 };
 
 void process_frame(uint64_t ts, uint64_t ftime, struct game_t *game) {
-	int offset = round(ftime * GAME_SPEED / 1000.0f);
-	//printf("offset: %d\n", offset);
+	game->ship.velocity += game->ship.accel * ftime;
+	game->ship.rect.y += (ftime * game->ship.velocity / 1000.0);
+
+	if (game->ship.rect.y >= game->scrH) {
+		game->over = true;
+	}
+
+	// top border
+	if (game->ship.rect.y < 50 && game->ship.velocity < 0) {
+		game->ship.velocity = 0;
+	}
 
-	game->ship.rect.x += offset;
-	game->ship.rect.y += offset;
 	game->ship.angle = ++game->ship.angle % 360;
 
 	SDL_RenderClear(game->renderer);
-	SDL_RenderCopy(game->renderer, game->bg.texture, NULL, NULL);
+
+	// tile background to whole screen area
+	for (int bg_x = 0; 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;
+			SDL_RenderCopy(game->renderer, game->bg.texture, NULL, &game->bg.rect);
+		}
+	}
+
 	SDL_RenderCopyEx(game->renderer, game->ship.texture, NULL, &game->ship.rect, game->ship.angle, NULL, SDL_FLIP_NONE);
 	SDL_RenderPresent(game->renderer);
 
@@ -73,16 +91,21 @@ int main(int argc, char *argv[]) {
 	game.ship.texture = SDL_CreateTextureFromSurface(game.renderer, knife_img);
 	assert(game.ship.texture != NULL);
 
+	SDL_GetClipRect(bg_img, &game.bg.rect);
+	SDL_GetClipRect(knife_img, &game.ship.rect);
+
 	SDL_FreeSurface(knife_img);
 	SDL_FreeSurface(bg_img);
 
-	game.ship.rect.w = 56;
-	game.ship.rect.h = 56;
-	game.ship.angle = 0;
-
+	SDL_GetRendererOutputSize(game.renderer, &game.scrW, &game.scrH);
 	SDL_RenderPresent(game.renderer);
 
+	// initial values
 	game.last_frame = SDL_GetTicks64();
+	game.ship.rect.x = 150;
+	game.ship.rect.y = 50;
+	game.ship.accel = 0.85; // pixels per second^2 essentially
+
 	// main game loop
 	while (!game.over) {
 		while (SDL_PollEvent(&event)) {
@@ -94,6 +117,9 @@ int main(int argc, char *argv[]) {
 				if (event.key.keysym.sym == SDLK_q) { // quit if "q" button is pressed
 					game.over = true;
 				}
+				if (event.key.keysym.sym == SDLK_SPACE) {
+					game.ship.velocity = -600;
+				}
 				break;
 			}
 		}