Display.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    Scorched3D is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <stdio.h>
#include <graph/Display.h>
#include <graph/OptionsDisplay.h>
#include <common/Defines.h>

Display *Display::instance_ = 0;

Display *Display::instance()
{
        if (!instance_)
        {
                instance_ = new Display;
        }

        return instance_;
}

Display::Display()
{

}

Display::~Display()
{
}


bool Display::changeSettings(int width, int height, bool full)
{
        // set opengl double buffering 
        int doubleBuffer = OptionsDisplay::instance()->getDoubleBuffer()?1:0;
        SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, doubleBuffer);

        // set opengl component size 
        int componentSize = OptionsDisplay::instance()->getColorComponentSize();
        SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, componentSize);
        SDL_GL_SetAttribute( SDL_GL_RED_SIZE, componentSize);
        SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, componentSize);
        SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, componentSize);

        if (OptionsDisplay::instance()->getAntiAlias() > 0)
        {
                // Anti-aliased
                SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
                SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 
                        OptionsDisplay::instance()->getAntiAlias());
        }
        
        // At least 24 bits depth buffer
        int depthBufferBits = OptionsDisplay::instance()->getDepthBufferBits();
        SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, depthBufferBits );

        // create display surface 
        int videoFlags = SDL_OPENGL | SDL_ANYFORMAT; // | SDL_RESIZABLE;  
        int flags = ( full ? videoFlags|SDL_FULLSCREEN : videoFlags);
        int bpp = OptionsDisplay::instance()->getBitsPerPixel();

        // Try to create suface
        surface = SDL_SetVideoMode( width, height, bpp, flags);

        // If this fails
        // Hack, to check if 16bit depth will work instead if 24 bits specified
        if (!surface &&
                depthBufferBits == 24)
        {
                SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
                surface = SDL_SetVideoMode( width, height, bpp, flags);
        }

        // And if this fails
        if (!surface)
        {
                char buffer[256];
                SDL_VideoDriverName(buffer, 256);
                S3D::dialogMessage("Display", S3D::formatStringBuffer(
                        "ERROR: Failed to set video mode.\n"
                        "Error Message: %s\n"
                        "----------------------------\n"
                        "Requested Display Mode:-\n"
                        "Driver=%s\n"
                        "Resolution=%ix%ix%i %s\n" 
                        "DepthBuffer=%i\n"
                        "DoubleBuffer=%s\n"
                        "ColorComponentSize=%i\n",
                        SDL_GetError(),
                        buffer, 
                        width, height, 
                        OptionsDisplay::instance()->getBitsPerPixel(),
                        (full?"(fullscreen)":"(windowed)"), 
                        OptionsDisplay::instance()->getDepthBufferBits(),
                        OptionsDisplay::instance()->getDoubleBuffer()?"On":"Off",
                        OptionsDisplay::instance()->getColorComponentSize()));
                return false;
        }
        return true;
}

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