view Xcode/TemplatesForXcodeLeopard/SDL OpenGL Application/main.c @ 3331:d44a0a913aa2

Eric Wing to Sam Lots of fixes. Fixed missing power management building. Added template icons to the project templates. DocSet stuff Documentation fixes.. Fixed all the SDLtests. (Lots of tedious work.) It now depends on the static library target for convenience so I am not going to remove it from the SDL xcode project.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 01 Oct 2009 15:30:26 +0000
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/* Simple program:  Create a blank window, wait for keypress, quit.

   Please see the SDL documentation for details on using the SDL API:
   /Developer/Documentation/SDL/docs.html
*/
   
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "SDL.h"

extern void Atlantis_Init ();
extern void Atlantis_Reshape (int w, int h);
extern void Atlantis_Animate ();
extern void Atlantis_Display ();

static SDL_Surface *gScreen;

static void initAttributes ()
{
    // Setup attributes we want for the OpenGL context
    
    int value;
    
    // Don't set color bit sizes (SDL_GL_RED_SIZE, etc)
    //    Mac OS X will always use 8-8-8-8 ARGB for 32-bit screens and
    //    5-5-5 RGB for 16-bit screens
    
    // Request a 16-bit depth buffer (without this, there is no depth buffer)
    value = 16;
    SDL_GL_SetAttribute (SDL_GL_DEPTH_SIZE, value);
    
    
    // Request double-buffered OpenGL
    //     The fact that windows are double-buffered on Mac OS X has no effect
    //     on OpenGL double buffering.
    value = 1;
    SDL_GL_SetAttribute (SDL_GL_DOUBLEBUFFER, value);
}

static void printAttributes ()
{
    // Print out attributes of the context we created
    int nAttr;
    int i;
    
    int  attr[] = { SDL_GL_RED_SIZE, SDL_GL_BLUE_SIZE, SDL_GL_GREEN_SIZE,
                    SDL_GL_ALPHA_SIZE, SDL_GL_BUFFER_SIZE, SDL_GL_DEPTH_SIZE };
                    
    char *desc[] = { "Red size: %d bits\n", "Blue size: %d bits\n", "Green size: %d bits\n",
                     "Alpha size: %d bits\n", "Color buffer size: %d bits\n", 
                     "Depth bufer size: %d bits\n" };

    nAttr = sizeof(attr) / sizeof(int);
    
    for (i = 0; i < nAttr; i++) {
    
        int value;
        SDL_GL_GetAttribute (attr[i], &value);
        printf (desc[i], value);
    } 
}

static void createSurface (int fullscreen)
{
    Uint32 flags = 0;
    
    flags = SDL_OPENGL;
    if (fullscreen)
        flags |= SDL_FULLSCREEN;
    
    // Create window
    gScreen = SDL_SetVideoMode (640, 480, 0, flags);
    if (gScreen == NULL) {
		
        fprintf (stderr, "Couldn't set 640x480 OpenGL video mode: %s\n",
                 SDL_GetError());
		SDL_Quit();
		exit(2);
	}
}

static void initGL ()
{
    Atlantis_Init ();
    Atlantis_Reshape (gScreen->w, gScreen->h);
}

static void drawGL ()
{
    Atlantis_Animate ();
    Atlantis_Display ();
}

static void mainLoop ()
{
    SDL_Event event;
    int done = 0;
    int fps = 24;
	int delay = 1000/fps;
    int thenTicks = -1;
    int nowTicks;
    
    while ( !done ) {

		/* Check for events */
		while ( SDL_PollEvent (&event) ) {
			switch (event.type) {

				case SDL_MOUSEMOTION:
					break;
				case SDL_MOUSEBUTTONDOWN:
					break;
				case SDL_KEYDOWN:
					/* Any keypress quits the app... */
				case SDL_QUIT:
					done = 1;
					break;
				default:
					break;
			}
		}
    
        // Draw at 24 hz
        //     This approach is not normally recommended - it is better to
        //     use time-based animation and run as fast as possible
        drawGL ();
        SDL_GL_SwapBuffers ();

        // Time how long each draw-swap-delay cycle takes
        // and adjust delay to get closer to target framerate
        if (thenTicks > 0) {
            nowTicks = SDL_GetTicks ();
            delay += (1000/fps - (nowTicks-thenTicks));
            thenTicks = nowTicks;
            if (delay < 0)
                delay = 1000/fps;
        }
        else {
            thenTicks = SDL_GetTicks ();
        }

        SDL_Delay (delay);
	}
}

int main(int argc, char *argv[])
{
	// Init SDL video subsystem
	if ( SDL_Init (SDL_INIT_VIDEO) < 0 ) {
		
        fprintf(stderr, "Couldn't initialize SDL: %s\n",
			SDL_GetError());
		exit(1);
	}

    // Set GL context attributes
    initAttributes ();
    
    // Create GL context
    createSurface (0);
    
    // Get GL context attributes
    printAttributes ();
    
    // Init GL state
    initGL ();
    
    // Draw, get events...
    mainLoop ();
    
    // Cleanup
	SDL_Quit();
	
    return 0;
}