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video_sdl.cpp

//FILE:         video_sdl.cpp
//AUTHOR:       Nathan Cournia <nathan@cournia.com>

#ifdef WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif

#include <GL/gl.h>
#include <GL/glu.h>
#include "gl.h"
#include "video_sdl.h"

video_sdl::video_sdl( void ): m_shutdown( false )
{ }

video_sdl::~video_sdl( void ) 
{ 
        shutdown( );
}

bool
video_sdl::init( unsigned int w, unsigned int h, unsigned int bpp, bool fs )
{
        //make sure passed in vars are sane
        if( w < 1 ) w = 1;
        if( h < 1 ) h = 1;
        if( bpp < 16 ) bpp = 16;

        //copy vars to internal vars
        m_width = w;
        m_height = h;
        m_bpp = bpp;
        m_fullscreen = fs;
        
        //initialize sdl
        if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) {
                set_error( SDL_GetError( ) );
                return false;
        }
        //atexit( SDL_Quit );

        //fullscreen
        int flags = SDL_OPENGL;
        if( m_fullscreen ) {
                flags |= SDL_FULLSCREEN;
        }
        
        //initialize video
        SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
        m_screen = SDL_SetVideoMode( m_width, m_height, m_bpp, flags);
        if( m_screen == NULL ) {
                set_error( SDL_GetError( ) );
                return false;
        }

        //initialize gl
        gl::init( m_width, m_height );

        //initalize the clock
        m_clock.reset( );

        //success
        return true;
}

void 
video_sdl::set_title( const std::string& title )
{
        SDL_WM_SetCaption( title.c_str( ), title.c_str( ) );
}

void 
video_sdl::resize( unsigned int w, unsigned int h )
{ }

void
video_sdl::start_frame( void )
{ 
        //update the clock
        m_clock.update( );

        //update instant fps
        m_fps = 1.0 / m_clock.elapsed( );

        //inc frame count;
        ++m_frame_count;

        //update avg fps
        m_fps_sum += m_clock.elapsed( );
        if( m_fps_sum > 1.0 ) {
                m_avg_fps = m_fps_sum * static_cast<double>( m_frame_count );
                m_fps_sum = 0.0;
                m_frame_count = 0;
        }

        //clear OpenGL buffers
        glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
}

void
video_sdl::end_frame( void )
{ 
        //swap buffers
        SDL_GL_SwapBuffers( );
}

void 
video_sdl::toggle_fullscreen( void )
{
        SDL_WM_ToggleFullScreen( m_screen );

        if( m_screen->flags & SDL_FULLSCREEN ) {
                m_fullscreen = true;
        } else {
                m_fullscreen = false;
        }
}

void 
video_sdl::shutdown( void ) 
{ 
        if( !m_shutdown ) {
                SDL_Quit( );
                m_shutdown = true;
        }
}

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