Example09_LogicRenderRates.cpp

/*
  How to use CRM32Pro library. Example 9: Logic and Render Rates.
  ---------------------------------------------------------
  
  >MegaStorm Systems (c) 2009
  >http://www.megastormsystems.com
  >Roberto Prieto
  
  - Initialize SDL and CRM32Pro.
  - Printing help on a window.
  - Use of log system.
  - Initialize graphics: window icon, video mode and cursor.
  - Load resources from DPF: images(IPF) and sprites.
  - Using ITimeSystem to set a Rendering rate(unlimited) and a Logic Rate to 20.
  - Using CRM32Pro.SetRenderCallback() to draw our objects at Rendering Rate.
  - Clone sprites. Sprites movement using a smooth and normal way.
  - Information panel with desired Logic Rate and current Render Rate.
  - With F1 key you can enable or disable the smooth movement.
  - With <- and -> cursors keys you can modify the desired Logic Rate.
  - Exiting using right way ;)
  
 */

// ---Includes---
#include "CRM32Pro.h"
#ifdef _WINDOWS
 #include <windows.h>
#endif

// ---Defines---
#define EXAMPLE_VERSION "Example 9: Logic and Render Rates"
#define GFX_RESOURCE "data/gfx.dpf"     // DPF with graphic resources

// ---Prototypes---
void RenderGraphics(int);
void RenderGraphicsGL(int);
void PrintHelp();

// ---Global vars---
SDL_Surface *bg, *info, *backinfo, *surfCursor;
CRM32Pro_CFont *fInfo;
CRM32Pro_CSprite *spr1, *spr2, *spr3, *spr4;
SDL_Rect inf;
Uint32 lastinfo = 0;
int bSmooth = -1;

// -------------MAIN FUNCTION----------------
int main(int argc,char *argv[])
{
   Uint8       done = 0;
   SDL_Event   event;
   int         tmp = 0;
   int         iPos1, iDir1, iPos2, iDir2, iPos3, iDir3, iPos4, iDir4;

   // -Print help on a window-
   PrintHelp();

   // -Log system initialize-    
   ILogSystem.Init("LogicRenderRates.log",LOG_FILE,LOG_NORMAL,EXAMPLE_VERSION);

   // -CRM32Pro and SDL initialize-   
   if(CRM32Pro.Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER) < 0)
   {
      ILogSystem.Msg(LOG_NORMAL," · [LOG] - Couldn´t initialize CRM32Pro: %s\n",SDL_GetError());        
      return 1;
   }    

   // -Desired config-
   CRM32Pro.Config.Title = EXAMPLE_VERSION;
   CRM32Pro.Config.Icon = IImage->Load(GFX_RESOURCE,"icono");
   CRM32Pro.Config.bMTFriendly = 1;
   //CRM32Pro.Config.VideoRenderer = RENDER_OPENGL;
   //CRM32Pro.Config.VideoAccel = ACCEL_HARDSMOOTH ;

   // -Graphics system initialize-  
   if(!CRM32Pro.SetVideoMode())
   {
      CRM32Pro.Quit();
      return 1;
   }

   // -Time system initialize-
   ITimeSystem->Init();
   ITimeSystem->SetRate(0,20);  // Desired Rendering and Logic Frame Rate

   // -Set our render graphics function to fullfil desired Rendering Frame Rate-
   if(!CRM32Pro.IsGL()) CRM32Pro.SetRenderCallback(RenderGraphics);
   else CRM32Pro.SetRenderCallback(RenderGraphicsGL);

   // -Load resources: background, info panel, info font, sprites    
   bg = IImage->Load(GFX_RESOURCE,"background2");
   info = IImage->Load(GFX_RESOURCE,"info2");
   inf.x = 6;inf.y = 6;inf.w = info->w;inf.h = info->h;
   backinfo = IImage->Load(GFX_RESOURCE,"info2");       
   fInfo = new CRM32Pro_CFont();
   fInfo->Load(GFX_RESOURCE,"InfoFont");
   spr1 = new CRM32Pro_CSprite();
   spr1->Load(GFX_RESOURCE,"rabbit");
   spr1->AutoRestore(0);
   spr1->Info();
   // as all our sprites have the same picture, we clone them!
   spr2 = new CRM32Pro_CSprite();
   spr2->Clone(spr1);
   spr3 = new CRM32Pro_CSprite();
   spr3->Clone(spr1);
   spr4 = new CRM32Pro_CSprite();
   spr4->Clone(spr1);

   // -Original positions and directions-
   iPos1 = 0;
   iDir1 = 1;
        
   spr2->GetOffset(&tmp,NULL);
   iPos2 = CRM32Pro.screen->w - tmp;
   iDir2 = -1;
        
   spr3->GetOffset(NULL,&tmp);
   iPos3 = CRM32Pro.screen->h - tmp;
   iDir3 = -1;

   iPos4 = 1;
   iDir4 = 1;

   // -Main loop-
   done = 1;    
   int test =0;

   while(done)
   {            
      // 1.Logic frame stuff
          // Move the sprites across the screen limits

      // 1.1.Sprite 1 stuff: movement of 1 pixel each logic frame
      iPos1 = iPos1 + (iDir1);
      spr1->SetPosition(CRM32Pro.screen->w / 2, iPos1, bSmooth);
          if((iPos1 < 1) || (iPos1 > CRM32Pro.screen->h)) iDir1 = iDir1 * (-1);

      // 1.2.Sprite 2 stuff: movement of 2 pixels each logic frame
      iPos2 = iPos2 + (2 * iDir2);
          spr2->SetPosition(iPos2,CRM32Pro.screen->h / 2, bSmooth);
      if((iPos2 < 1) || (iPos2 > CRM32Pro.screen->w)) iDir2 = iDir2 * (-1);

      // 1.3.Sprite 3 stuff: movement of 3 pixels each logic frame
      iPos3 = iPos3 + (3 * iDir3);
          spr3->SetPosition(CRM32Pro.screen->w / 3, iPos3, bSmooth);
      if((iPos3 < 1) || (iPos3 > CRM32Pro.screen->h)) iDir3 = iDir3 * (-1);

      // 1.4.Sprite 4 stuff: movement of 4 pixels each logic frame      
      iPos4 = iPos4 + (4 * iDir4);      
          spr4->SetPosition(iPos4,CRM32Pro.screen->h / 3, bSmooth);
      if((iPos4 < 1) || (iPos4 > CRM32Pro.screen->w)) iDir4 = iDir4 * (-1);

          // 2.Event loop: update all systems: our graphics using render callback function,events,timing...
      while(CRM32Pro.Update(&event))    
      {
         switch(event.type)
         {
            case SDL_KEYDOWN:
               // Exit
                           if(event.key.keysym.sym == SDLK_ESCAPE) done = 0;             
                           // Enable or disable smooth movement
                           if(event.key.keysym.sym == SDLK_F1) bSmooth = bSmooth * (-1); 
                           // Inc or dec the Logic Rate
                           if(event.key.keysym.sym == SDLK_RIGHT) ITimeSystem->SetRate(ITimeSystem->GetDesiredRFR(),ITimeSystem->GetDesiredLFR()+1);
                           if(event.key.keysym.sym == SDLK_LEFT) ITimeSystem->SetRate(ITimeSystem->GetDesiredRFR(),ITimeSystem->GetDesiredLFR()-1);
                           break;

            case SDL_QUIT:
               done = 1;
               break;

            case EVENT_LOGICWAIT:
               // While CRM32Pro.Update() wait for fulfill the logic rate this event is raised  
                           // You could call to the Rendering Graphics here instead of to use the CRM32Pro callback.
               break;

            default:
               break;
         }
      }
   }

   // -Free resources, show information and exit-
   delete fInfo;
   delete spr4;
   delete spr3;
   delete spr2;
   delete spr1;
   CRM32Pro.FreeSurface(bg);
   CRM32Pro.FreeSurface(info);
   CRM32Pro.FreeSurface(backinfo);
   ITimeSystem->Info();
   CRM32Pro.VideoInfo();
   CRM32Pro.Quit();
   return 0;
}


// ---Our render graphics function---
void RenderGraphics(int bLogicUpdate)
{
   char  sTmp[16];

   // -Blit background-
   SDL_BlitSurface(bg,NULL,CRM32Pro.screen,NULL);

   // Sprites blitting
   spr4->Draw();
   spr3->Draw();
   spr2->Draw();
   spr1->Draw();

   // Blit information panel: updated twice per second
   SDL_BlitSurface(info,NULL,CRM32Pro.screen,&inf);
   if((lastinfo + 500) < ITimeSystem->GetTime())
   {
      lastinfo = ITimeSystem->GetTime();
      // Restore original info panel
      SDL_BlitSurface(backinfo,NULL,info,NULL);

          // User´s desired logic rate
          sprintf(sTmp,"%d",(Uint32)ITimeSystem->GetDesiredLFR());
          fInfo->PutString(info,80,6,sTmp);

      // Frames per second (real time)
      sprintf(sTmp,"%d",(Uint32)ITimeSystem->GetCurrentRFR());
      fInfo->PutString(info,80,23,sTmp);

          // Using smooth way or not?
          if(bSmooth == 1) fInfo->PutString(info,65,40,"ON");
          else fInfo->PutString(info,65,40,"OFF");
   }
}

// ---Our render graphics function for OpenGL mode---
// In OpenGL modes, blitting from a surface to another surface requires some conversions
// so the best workaround is just blit everything to CRM32Pro.screen surface.
void RenderGraphicsGL(int bLogicUpdate)
{
   char  sTmp[16];

   // -Blit background-
   SDL_BlitSurface(bg,NULL,CRM32Pro.screen,NULL);

   // Sprites blitting
   spr4->Draw();
   spr3->Draw();
   spr2->Draw();
   spr1->Draw();

   // Blit information panel each frame update
   lastinfo = ITimeSystem->GetTime();
   // Restore original info panel
   SDL_BlitSurface(backinfo,NULL,CRM32Pro.screen,NULL);

   // User´s desired logic rate
   sprintf(sTmp,"%d",(Uint32)ITimeSystem->GetDesiredLFR());
   fInfo->PutString(CRM32Pro.screen,80,6,sTmp);

   // Frames per second (real time)
   sprintf(sTmp,"%d",(Uint32)ITimeSystem->GetCurrentRFR());
   fInfo->PutString(CRM32Pro.screen,80,23,sTmp);

   // Using smooth way or not?
   if(bSmooth == 1) fInfo->PutString(CRM32Pro.screen,65,40,"ON");
   else fInfo->PutString(CRM32Pro.screen,65,40,"OFF");
}

// --------------------Help STUFF------------------------
// -Print help-
void PrintHelp()
{
        char *sMsg;

        // Create the message
        sMsg = new char[1024];
    strcpy(sMsg,"-----------------------------------------------------------\n");
        strcat(sMsg,"            ");
        strcat(sMsg,EXAMPLE_VERSION);
        strcat(sMsg,"\n-----------------------------------------------------------\n\n");
        strcat(sMsg," Press [ESCAPE] key to exit.\n");
        strcat(sMsg," Press [F1] key to enable/disable smooth animation.\n");
        strcat(sMsg,"\n To see further information, open 'LogicRenderRates.log'.\n");
        strcat(sMsg,"\n");

        // Display the message
    #ifdef _WINDOWS
          MessageBox(NULL,sMsg,"CRM32Pro SDK - HelpScreen",MB_OK);
    #endif
        #ifdef _LINUX 
          printf("CRM32Pro SDK - HelpScreen\n%s",sMsg);
    #endif

        // Free the message
        delete sMsg;
}