include/engine.h

@@ -6,16 +6,13 @@
 #include <string.h>
 #include <stdint.h>
 
-#define WINDOW_WIDTH 1280
+#define WINDOW_NAME_MAX_LENGTH 128
-#define WINDOW_HEIGHT 720
-#define DEFAULT_WINDOW_NAME "Dangerzone"
-#define WINDOW_NAME_LENGTH 128
 #define TARGET_FRAME 1.0 / 60.0
 #define FONT_ROWS 7
 #define FONT_COLS 5
 
 typedef struct {
-	char window_name[WINDOW_NAME_LENGTH];
+	char window_name[WINDOW_NAME_MAX_LENGTH];
 	uint16_t width, height;
 	SDL_Window *window;
 	SDL_Renderer *renderer;
@@ -38,19 +35,23 @@ typedef struct {
 } engine_internal_state_t;
 
 typedef struct {
-	uint32_t framebuffer[WINDOW_WIDTH * WINDOW_HEIGHT];
 	SDL_Event event;
 	bool is_running;
 	bool framebuffer_dirty;
 	SDL_Rect dirty_rect;
 	uint16_t width, height;
+	uint32_t *framebuffer;
 } game_state_t;
 
 extern engine_internal_state_t *internal_state;
 extern game_state_t *game_state;
 
 engine_sdl_state_t*
-engine_sdl_init();
+engine_sdl_init(
+	uint32_t window_width,
+	uint32_t window_height,
+	const char window_name[]
+);
 
 void 
 engine_sdl_destroy(
@@ -59,6 +60,9 @@ engine_sdl_destroy(
 
 bool
 engine_init(
+	uint32_t window_width,
+	uint32_t window_height,
+	const char window_name[],
 	void (*engine_poll_events)(void),
 	void (*engine_update_framebuffer)(void)
 );

src/engine/engine.c

@@ -172,5 +172,6 @@ void
 engine_stop() {
 	engine_sdl_destroy(internal_state->sdl_state);
 	free(internal_state);
+	free(game_state->framebuffer);
     free(game_state);
 }

src/engine/engine_init.c

@@ -2,9 +2,15 @@
 #include "error.h"
 #include <SDL3/SDL_render.h>
 #include <SDL3/SDL_video.h>
+#include <stdint.h>
 
 bool
-engine_sdl_init_state(engine_sdl_state_t **state) {
+engine_sdl_init_state(
+	engine_sdl_state_t **state,
+	uint32_t window_width,
+	uint32_t window_height,
+	const char window_name[]
+) {
  	*state = (engine_sdl_state_t *)
 	 	malloc(sizeof(engine_sdl_state_t));
 
@@ -13,12 +19,13 @@ engine_sdl_init_state(engine_sdl_state_t **state) {
 		return RCODE_FAILURE;
 	}
 
-	(*state)->width = WINDOW_WIDTH;
+	(*state)->width = window_width;
-	(*state)->height = WINDOW_HEIGHT;
+	(*state)->height = window_height;
 	strncpy(
-		(*state)->window_name, DEFAULT_WINDOW_NAME, 
+		(*state)->window_name, window_name,
-		WINDOW_NAME_LENGTH
+		WINDOW_NAME_MAX_LENGTH - 1
 	);
+	(*state)->window_name[WINDOW_NAME_MAX_LENGTH - 1] = '\0';
 
 	return RCODE_SUCCESS;
 }
@@ -94,11 +101,19 @@ engine_sdl_init_texture(
 }
 
 engine_sdl_state_t*
-engine_sdl_init() 
+engine_sdl_init(
-{
+	uint32_t window_width,
+	uint32_t window_height,
+	const char window_name[]
+) {
 	engine_sdl_state_t *state;
 
-	if (!engine_sdl_init_state(&state) || 
+	if (!engine_sdl_init_state(
+			&state,
+			window_width,
+			window_height,
+			window_name
+		) || 
 		!engine_sdl_init_root() || 
 		!engine_sdl_init_window(state) ||
 		!engine_sdl_init_renderer(state) ||
@@ -127,6 +142,9 @@ engine_sdl_destroy(
 
 bool
 engine_init(
+	uint32_t window_width,
+	uint32_t window_height,
+	const char window_name[],
 	void (*engine_poll_events)(void),
 	void (*engine_update_framebuffer)(void)
 ) {
@@ -143,15 +161,28 @@ engine_init(
 		return RCODE_FAILURE;
 	}
 
+	game_state->framebuffer = (uint32_t *)
+		malloc(sizeof(uint32_t) * window_width * window_height);
+	if (game_state->framebuffer == NULL) {
+		free(internal_state);
+		free(game_state);
+		return RCODE_FAILURE;
+	}
+
 	internal_state->engine_poll_events
 		= engine_poll_events;
 
 	internal_state->engine_update_framebuffer
 		= engine_update_framebuffer;
 
-	internal_state->sdl_state = engine_sdl_init();
+	internal_state->sdl_state = engine_sdl_init(
+		window_width,
+		window_height,
+		window_name
+	);
 	if (internal_state->sdl_state == NULL) {
 		free(internal_state);
+		free(game_state->framebuffer);
 		free(game_state);
 		return RCODE_FAILURE;
 	}

src/main.c

@@ -25,10 +25,8 @@ client_poll_event()
 void
 client_update_framebuffer()
 {
-	// single green demo pixel
+	// example window contents
-	game_state->framebuffer[0] = 0x00FF00;
+	clear_framebuffer(0xFFFF00);
-
-	put_rect(0, 0, 1100, 200, 0xFFFF00);
 	put_string("Hello, traveller. You have come\nto the right place!",
 		20, 20, 2, 2, 3, 0x000000, 0xFFFF00
 	);
@@ -39,6 +37,8 @@ main()
 {
 	// initialize the engine
 	if (engine_init(
+		500, 100,
+		"Dangerzone",
 		client_poll_event,
 		client_update_framebuffer
 	)) {