Issue with SDL type returns
This is probably amateur-ish, but I've been going through the Lazy Foo Productions tutorials to learn how to use SDL, but since I'm such a stubborn programmer I decided to write my code in C rather than C++, everything I've been doing up unitl a certain point, works. But then I got tired of writing the same functions and variables, over and over again, so I decided to create a header to declare my global Macros and functions and intialized those in a C source file, problem is, I get some weird compiling errors now:
Code:
#ifndef SDL_TUTORIAL_HANDLER_H_INCLUDED
#define SDL_TUTORIAL_HANDLER_H_INCLUDED
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480
#define SCREEN_BPP 32
#define TRUE 1
#define FALSE 0
SDL_Surface *load_image( char* filename );
void apply_surface( int Pos_X, int Pos_Y, SDL_Surface* source, SDL_Surface* destination );
typedef int Bool;
Bool init();
Bool load_files();
void clean_up();
#endif // SDL_TUTORIAL_HANDLER_H_INCLUDED
This is all fine, but depending on where my pointers are for the C file:
Code:
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL_Tutorial_Handler.h"
SDL_Surface *image = NULL;
SDL_Surface *screen = NULL;
SDL_Surface *load_image( char* filename ){
SDL_Surface* loaded_image = NULL;
SDL_Surface* optimized_image = NULL;
loaded_image = IMG_Load( filename );
if ( loaded_image != NULL ){
optimized_image = SDL_DisplayFormat( loaded_image );
SDL_FreeSurface( loaded_image );
}
return *optimized_image; \* There is a return error here *\
}
void apply_surface( int Pos_X, int Pos_Y, SDL_Surface* source, SDL_Surface* destination ){
SDL_Rect offset;
offset.x = Pos_X;
offset.y = Pos_Y;
SDL_BlitSurface( source, NULL, destination, &offset );
}
Bool init(){
if ( SDL_Init( SDL_INIT_EVERYTHING ) == -1 ){
return FALSE;
}
screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );
if ( screen == NULL ){
return FALSE;
}
SDL_WM_SetCaption( "Image Library Tutorial", NULL );
return TRUE;
}
Bool load_files(){
image = load_image( "Hello.png" );
if ( image == NULL ){
return FALSE;
}
return TRUE;
}
void clean_up(){
SDL_FreeSurface( image );
SDL_Quit();
}
I get slapped with a multiple definitions error, so I changed those pointers and now I get a single error telling me that the return type for the *load_image function is incompatible for the function, even though they are both SDL_Surface. For anyone who can understand what I'm talking about, any advice?
You'd think that'd be the problem but...
There are no reports of these functions being declared more than once, which I find to be very odd.
