diff options
| author | Silvan Jegen <s.jegen@gmail.com> | 2018-09-22 20:01:40 +0200 |
|---|---|---|
| committer | Silvan Jegen <s.jegen@gmail.com> | 2018-09-22 20:05:53 +0200 |
| commit | 5d5bc3e446ee50601f98ca30d4f21172d6e75e29 (patch) | |
| tree | abdbe68d23373c095e2d50b2cd8f15af40dfdb65 /main.c | |
Initial commit
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 117 |
1 files changed, 117 insertions, 0 deletions
@@ -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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