Code: 3d_underwater_world/main.cpp

This is an example OpenGL SDL application which creates an animated 3D underwater world (screenshot), with "Thunderbird 4" with headlights moving on a spline path, a randomly generated sand terrain, sunken ship/submarine/treasure chest models, and swaying fish and seaweed. It is designed to demonstrate basic OpenGL features, and the structure is as follows:

/* COMP3004: COURSEWORK 3
 * Tristan Aubrey-Jones (taj105)
 * -------------------------------
*/
#include 
#include 
#include 
#include "global.h"
#include "game.h"

// method declarations
void initgl(int, char**);

// CONTROL
// program entry point
int main(int argc, char *argv[])
{
    // setup graphics library
    initgl(argc, argv);
    // set window manager title bar 
    SDL_WM_SetCaption( "COMP3004 Coursework 3", "cwk3" );
    // sets up a parallel projection on the SDL window
    glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT); 
    // run 
    Game* game = new Game();
    game->run();
    // quit
    delete game;
    SDL_Quit();
    return 0;
}

// set up opengl and sdl
// --------------------------------------------------------------
// TAKEN FROM COMP3004 COLOURED CUBE NOTES EXAMPLE
// https://secure.ecs.soton.ac.uk/notes/comp3004/lectures/code.html
// VERBATIM BEGINS HERE
void initgl(int argc, char* argv[])
{
    int rgb_size[3];
    int bpp;
    int i;
    Uint32 video_flags = SDL_OPENGL;
    if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) {
        fprintf(stderr,"Couldn't initialize SDL: %s\n",SDL_GetError());
        exit( 1 );
    }
    /* See if we should detect the display depth */
    if ( bpp == 0 ) {
        if ( SDL_GetVideoInfo()->vfmt->BitsPerPixel <= 8 ) {
            bpp = 8;
        } else {
            bpp = 16;  /* More doesn't seem to work */
        }
    }
    for ( i=1; argv[i]; ++i ) {
        if ( strcmp(argv[i], "-fullscreen") == 0 ) {
            video_flags |= SDL_FULLSCREEN;
        }
    }
    bpp = 32;
    /* Initialize the display */
    switch (bpp) {
       case 8:
            rgb_size[0] = 3;
            rgb_size[1] = 3;
            rgb_size[2] = 2;
            break;
       case 15:
       case 16:
            rgb_size[0] = 5;
            rgb_size[1] = 5;
            rgb_size[2] = 5;
            break;
        default:
            rgb_size[0] = 8;
            rgb_size[1] = 8;
            rgb_size[2] = 8;
            break;
    }
    SDL_GL_SetAttribute( SDL_GL_RED_SIZE, rgb_size[0] ); // Sets bits per channel
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, rgb_size[1] );
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, rgb_size[2] );
    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 ); // 3 channels per pixel (R, G and B)
    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLEBUFFERS, 1 ); // ?
    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLESAMPLES, 1 );
    SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1 );
    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1 );
    if ( SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, bpp, video_flags) == NULL ) {
        fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
        SDL_Quit();
        exit(1);
    }
}
// --------------------------------------------------------------------
// VERBATIM ENDS HERE

3D Underwater World (using OpenGL and SDL)

main.cpp