demos/SdlDemo.cpp

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#include "SDL.h"
#include "DemoConfig.h"


DemoEventHandler handler;
GuiWrapper gui(&handler);
unsigned int oldTime = 0;

bool InitSDL();
void RenderScene();
void ResizeWindow(int width, int height);

 

int main (int argc, char *argv[]) {

        bool done = false;
        int videoFlags;
        int SCREEN_WIDTH  = 700;
        int SCREEN_HEIGHT = 500;
        int SCREEN_BPP    = 32;

        const char APP_NAME[] = "SDL Demo";

        std::string DataDir = DEMO_DATA_DIR;
        if (argc == 2) DataDir = argv[1];

        SDL_Event event;
        SDL_Surface *surface;

        //init sdl and sdl_net
        if ( !InitSDL() ) {
                printf("Video initialization failed.\n");
                exit(0);
        }

        //call SDL_Quit if program exits
        atexit(SDL_Quit);


        //set openGL attribute
        SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );

        //set window title
        SDL_WM_SetCaption(APP_NAME, APP_NAME);

        //set video flags
        videoFlags = SDL_OPENGL | SDL_RESIZABLE;    

        // get a SDL surface
        surface = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP,
                                videoFlags );

        //check that we got a surface
        if ( !surface ) {
                printf("Video mode set failed: %s\n", SDL_GetError( ) );
                exit(0);
        }


        //initialize gui
        if ( !gui.Init(DataDir.c_str()) ) {
                printf("Failed to initialize gui.\n");
                exit(0);
        }

        //initialize window size
        ResizeWindow( SCREEN_WIDTH, SCREEN_HEIGHT );

        //--- main loop ----

        while ( !done ) {

            //handle the events in the queue 
            while ( SDL_PollEvent( &event ) )
                {
                    switch( event.type )
                        {
                            
                        case SDL_VIDEORESIZE:
                                surface = SDL_SetVideoMode( event.resize.w, event.resize.h, SCREEN_BPP, videoFlags );
                                if ( !surface ) {
                                        printf("Could not get a surface after resize: %s\n", SDL_GetError() );
                                        exit(0);
                                }

                                ResizeWindow( event.resize.w, event.resize.h );
                                RenderScene();
                                break;
                        case SDL_KEYDOWN:
                                gui.AsciiKeyDown( event.key.keysym.sym );
                                break;
                        case SDL_MOUSEMOTION:
                                gui.MouseMoved(event.motion.x, event.motion.y); //event.motion.xrel, event.motion.yrel
                                break;
                        case SDL_MOUSEBUTTONDOWN:
                                if (event.button.button == SDL_BUTTON_LEFT)
                                        gui.MouseClicked(1, true, event.button.x, event.button.y);
                                else if (event.button.button == SDL_BUTTON_RIGHT)
                                        gui.MouseClicked(2, true, event.button.x, event.button.y);
                                break;
                        case SDL_MOUSEBUTTONUP:
                                if (event.button.button == SDL_BUTTON_LEFT)
                                        gui.MouseClicked(1, false, event.button.x, event.button.y);
                                else if (event.button.button == SDL_BUTTON_RIGHT)
                                        gui.MouseClicked(2, false, event.button.x, event.button.y);
                                break;
                        case SDL_QUIT:
                                done = true;
                                break;
                        default:
                                break;
                        }
                }

                if (!done) {

                        //render
                        RenderScene();
                }
        }

        SDL_Quit();

        return 0;
}

bool InitSDL() {

        // initialize SDL
        if(SDL_Init( SDL_INIT_VIDEO ) < 0)
        {
                printf("SDL_Init: %s\n",SDL_GetError());
                return false;
        }

        //turn on keyboard key repeat
        if ( ( SDL_EnableKeyRepeat( 500, SDL_DEFAULT_REPEAT_INTERVAL ) ) ) {
                printf("Setting keyboard repeat failed: %s\n", SDL_GetError( ) );
                return false;
        }

        return true;
}

void ResizeWindow(int width, int height) {

  float aspectRatio = 1.33f;
  height            = height <= 0 ? 1 : height;
  aspectRatio       = (float)width/height;

  glViewport(0, 0, width, height);
  glMatrixMode(GL_PROJECTION);

  glLoadIdentity();
  gluPerspective(90.0f, aspectRatio, 1.0f, 1500.0f);

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();

  gui.SetDimensions(width, height);

}

void RenderScene()
{
        glClearColor(handler.red, handler.green, handler.blue, 0.0f);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        //get elapsed milliseconds
        int time = SDL_GetTicks();
        gui.Update((time-oldTime)/1000.0f);
        oldTime = time;

        if (gui.IsActive()) gui.RenderScene();
        SDL_GL_SwapBuffers( );

}

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