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src/SAL_render.cpp

/*
    SAL - Simple Application Library
    Copyright (C) 2006-2006 Kronon

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Kronon
    kronon88@users.sourceforge.net
*/

//SAL render functions
//Created by Kronon

#include "SAL_render.h"

//Doxy gen information

int SAL_render_thread(void *unused)
{
        #ifdef SAL_DEBUG_ON
        sleep(1);       //Debuger crashes in some case because it can't find the thread after termination
                if(SAL_struct.internal.render.display == NULL)
                {
                        salError("Error: The display isn't set yet");
                        return -1;
                }
                if(SAL_struct.setting.render.refresh_rate == 0)
                {
                        printf("Event driven renderer selected.\n");
                        return 0;
                }
    #endif
    
                if(SAL_struct.setting.render.refresh_rate == 0)
                {
                        #ifdef SAL_DEBUG_ON
                                salError("Not using any refresh rate");
                        #endif
                        return 0;
                }
                //FIXME: should be in the loadable render mode files
                while(SAL_struct.internal.checks.alive)
                {   
//             while(SAL_struct.internal.render.lock)            //Not perfect solution but it won't (almost never) render while drawing
//             {
//                 SDL_Delay(7);
//             }
                        SDL_Flip(SAL_struct.internal.render.display);
                        SDL_Delay(SAL_struct.setting.render.refresh_rate);
                }
        return 0;
}

int salRefresh()
{
        SDL_Rect dest;                                                      //The coordinates where the image will be drawn
        dest.w = 0;
        dest.h = 0;
        SAL_gui_object* gui_object;                                                                                             //Object that needs to be updated
        //Redraw buttons
        for(SAL_struct.internal.event.visable_objects.setLoopBegin(); SAL_struct.internal.event.visable_objects.inLoop(); )
        {
                gui_object = SAL_struct.internal.event.visable_objects.getLoopEntry();
                dest.x = gui_object->x;
                dest.y = gui_object->y;
                if ( SDL_MUSTLOCK(SAL_struct.internal.render.display) )                             //Lock structure
                {
                        if ( SDL_LockSurface(SAL_struct.internal.render.display) < 0 )
                        {
                                return -1;
                        }
                }
                //Blit the image to the display
                
                SDL_BlitSurface(gui_object->surface,NULL,SAL_struct.internal.render.display,&dest);
                if ( SDL_MUSTLOCK(SAL_struct.internal.render.display) )                             //Unlock structure
                {
                        SDL_UnlockSurface(SAL_struct.internal.render.display);
                }
        }
        return SDL_Flip(SAL_struct.internal.render.display);
}

int SAL_start_renderer()
{
        SAL_struct.internal.render.thread = SDL_CreateThread(SAL_render_thread, NULL);
        #ifdef SAL_DEBUG_ON
                if(SAL_struct.internal.render.thread == NULL)
                {
                        salError("Error: Render thread couldn't start");
                        return -1;
                }
    #endif
    return 0;
}