I am setting up SDL 1.2 and I get this error. Here is my code:
#include <stdio.h>
#include <SDL.h>
#define WIDTH 1366
#define HEIGHT 768
#define BPP 4
#define DEPTH 32
void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b)
{
Uint32 *pixmem32;
Uint32 colour;
colour = SDL_MapRGB( screen->format, r, g, b );
pixmem32 = (Uint32*) screen->pixels + y + x;
*pixmem32 = colour;
}
void DrawScreen(SDL_Surface* screen, int h)
{
int x, y, ytimesw;
if(SDL_MUSTLOCK(screen))
{
if(SDL_LockSurface(screen) < 0) return;
}
for(y = 0; y < screen->h; y++ )
{
ytimesw = y*screen->pitch/BPP;
for( x = 0; x < screen->w; x++ )
{
setpixel(screen, x, ytimesw, (x*x)/256+3*y+h, (y*y)/256+x+h, h);
}
}
if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
SDL_Flip(screen);
}
int main(int argc, char* argv[])
{
SDL_Surface *screen;
SDL_Event event;
int keypress = 0;
int h=0;
if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_FULLSCREEN|SDL_HWSURFACE)))
{
SDL_Quit();
return 1;
}
while(!keypress)
{
DrawScreen(screen,h++);
while(SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_QUIT:
keypress = 1;
break;
case SDL_KEYDOWN:
keypress = 1;
break;
}
}
}
SDL_Quit();
return 0;
}
I got this from here: http://www.friedspace.com/cprogramming/sdlbasic.php (http://www.friedspace.com/cprogramming/sdlbasic.php)
Here is my error:
Building engine.exe.
POLINK: error: Unresolved external symbol '_SDL_main@8'.
POLINK: fatal error: 1 unresolved external(s).
*** Error code: 1 ***
Done.
Attached is my full project folder.
SDL uses __cdecl
Use it with sdlmain.lib project
QuoteSet Compiler Options
Go to Project->Project Options->Compiler and tick the box that says "Enable Microsoft Extensions" and set "Calling conv" to "__cdecl" in the drop down box.
SDL_win32_main.c can found from here (http://www.libsdl.org/release/SDL-1.2.15/src/main/win32/)
EDIT:
If someone doesn't care about portability and don't want to use SDL_win32_main
#include <stdio.h>
#include "SDL/SDL.h"
#pragma comment(lib, "sdl.lib")
//#pragma comment(lib, "sdl_main.lib")
#pragma comment(linker, "/SUBSYSTEM:WINDOWS")
#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32
void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b)
{
Uint32 *pixmem32;
Uint32 colour;
colour = SDL_MapRGB(screen->format, r, g, b);
pixmem32 = (Uint32 *)screen->pixels + y + x;
*pixmem32 = colour;
}
void DrawScreen(SDL_Surface *screen, int h)
{
int x, y, ytimesw;
if (SDL_MUSTLOCK(screen)) {
if (SDL_LockSurface(screen) < 0)
return;
}
for (y = 0; y < screen->h; y++) {
ytimesw = y * screen->pitch / BPP;
for (x = 0; x < screen->w; x++) {
setpixel(screen, x, ytimesw, (x * x) / 256 + 3 * y + h, (y * y) / 256 + x + h, h);
}
}
if (SDL_MUSTLOCK(screen))
SDL_UnlockSurface(screen);
SDL_Flip(screen);
}
#ifdef _WIN32
int __stdcall WinMain(int hInstance, int hPrevInstance, char* lpszCmdLine, int nCmdShow)
//int __cdecl WinMainCRTStartup(void)
#else
int __cdecl main(int argc, char *argv[])
#endif
{
SDL_Surface *screen;
SDL_Event event;
int keypress = 0;
int h = 0;
if (SDL_Init(SDL_INIT_VIDEO) < 0)
return 1;
//if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_FULLSCREEN|SDL_HWSURFACE)))
if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_SWSURFACE | SDL_RESIZABLE))) {
SDL_Quit();
return 1;
}
while (!keypress) {
DrawScreen(screen, h++);
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
keypress = 1;
break;
case SDL_KEYDOWN:
keypress = 1;
break;
case SDL_VIDEORESIZE:
screen = SDL_SetVideoMode( event.resize.w, event.resize.h, DEPTH, SDL_SWSURFACE | SDL_RESIZABLE);
break;
}
}
}
SDL_Quit();
return 0;
}