From 5d5bc3e446ee50601f98ca30d4f21172d6e75e29 Mon Sep 17 00:00:00 2001
From: Silvan Jegen <s.jegen@gmail.com>
Date: Sat, 22 Sep 2018 20:01:40 +0200
Subject: Initial commit

---
 main.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 main.c

(limited to 'main.c')

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..5561051
--- /dev/null
+++ b/main.c
@@ -0,0 +1,117 @@
+// Standard libraries ( not written by me )
+#include <stdio.h>
+#include <string.h>
+
+// SDL libraries ( not written by me )
+#include "SDL2/SDL.h"
+#include "SDL2/SDL_image.h"
+
+#ifdef __WIN32__
+	// Work around a TCC<->SDL bug regarding the redefintion of main.
+	// Note: the error messages from TCC make no sense
+	#undef main
+#endif
+
+
+// Window dimensions
+#define SCREEN_WIDTH 640
+#define SCREEN_HEIGHT 480
+#define TILE_SIZE 32 // Width and height of 'squares' in the game
+
+#define SCREEN_WIDTH_SQUARES SCREEN_WIDTH / TILE_SIZE
+#define SCREEN_HEIGHT_SQUARES SCREEN_HEIGHT / TILE_SIZE
+
+// Modules of the game I have written ( in directory with this source file )
+#include "level.c"      // Level structures, loading, other levely stuff
+#include "helpscreen.c" // Help-screen code
+#include "echidna_ai.c" // Echidna movement A
+#include "render.c"     // Normal in-game rendering
+#include "game.c"       // Normal in-game code
+
+/* error_sdl is called when SDL 'throws' an error
+ * SDL can throw an error if the computer is for example incapable of displaying
+ * the game, because it is too old ( ie  made before the year 1998 ) */
+void error_sdl( char* reason )
+{
+	// Print the error message and then close the game
+	fprintf( stderr, "Error (SDL): %s: %s\n", reason, SDL_GetError() );
+	exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+	/// Initialisation
+
+	/* First we need to tell SDL to create a window.  A 'surface' is created called surf_screen, 
+	 * 'surfaces' are simply images of what we see on-screen. 
+	 * 
+	 * To make things appear on the screen, I copy ('blit') images onto this surface at different locations 
+	 */
+
+	// Initialise SDL
+	printf("Initialising SDL... ");
+	if ( SDL_Init( SDL_INIT_VIDEO ) == -1 ) error_sdl("Could not initialise SDL");
+	atexit(SDL_Quit);
+
+	// Set surf_screen
+	SDL_Surface* surf_screen = NULL;
+	SDL_Window * sdlWindow = SDL_CreateWindow("EchidneaMenace", SDL_WINDOWPOS_UNDEFINED,
+			SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_FULLSCREEN | SDL_WINDOW_OPENGL );
+	if ( surf_screen == NULL ) error_sdl("Could not set videomode");
+	SDL_Renderer *renderer = SDL_CreateRenderer(sdlWindow, -1, 0);
+	
+	printf("done\n");
+	
+	
+	/// Menu
+	printf(" ==== Entered menu\n");
+
+	// Events are variables used to store user input
+	SDL_Event menuevent;
+	// Load the menu graphic into memory
+	SDL_Surface *surf_title = IMG_Load( "titlescreen.png" );
+	
+	
+	/* We loop the menu continously for a number of reasons:
+	 *  1) To make sure we capture and respond to user input
+	 *  2) To continue redrawing the menu graphic.
+	 * 
+	 * If we did not do number 2 then the window would appear blank if minimised
+	 * and then de-minimised again, amongst other situations
+	 */
+	while ( 1 )
+	{
+		SDL_BlitSurface( surf_title, NULL, surf_screen, NULL); // Draw menu
+		SDL_Flip( surf_screen ); // Update screen
+
+		// The while statement attempts to go through every key the user has pressed
+		// it stops when the user has not pressed any more keys
+		// this is useful incase the user presses keys fast or multiple at once
+		while ( SDL_PollEvent( &menuevent ) )
+		{
+			if ( menuevent.type == SDL_KEYDOWN )
+			{
+				// Menu choice selection
+				if      ( menuevent.key.keysym.sym == SDLK_p ) game_loop( surf_screen );
+				else if ( menuevent.key.keysym.sym == SDLK_h ) help( surf_screen );
+				else if ( menuevent.key.keysym.sym == SDLK_q || menuevent.key.keysym.sym == SDLK_ESCAPE ) exit(0);
+			}
+		}
+
+		// If we do not 'wait' or sleep in every ieteration of the loop
+		// the game will loop as fast as it can, utilising 100% of the CPU
+		SDL_Delay( 200 ); 
+	}
+	
+	
+	
+	
+	/* Technically the computer will never reach this point, because the while statement
+	 * above will run forever until the user quits the game.
+	 * 
+	 * The 'return' statement is still written here so the compiler does not complain
+	 */
+	
+	return 0;
+	
+}	
-- 
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