S60 3rd Edition SDK for Symbian OS
Example Applications Guide

CSimpleLightContainer Class Reference

#include <SimpleLightContainer.h>

List of all members.

Public Member Functions

void ConstructL (const TRect &aRect)
virtual ~CSimpleLightContainer ()

Static Public Member Functions

static int DrawCallBack (TAny *aInstance)

Public Attributes

TInt iFrame
CSimpleLight * iSimpleLight

Private Member Functions

void SizeChanged ()
void HandleResourceChange (TInt aType)
TInt CountComponentControls () const
CCoeControl * ComponentControl (TInt aIndex) const
void Draw (const TRect &aRect) const
void HandleControlEventL (CCoeControl *aControl, TCoeEvent aEventType)

Private Attributes

EGLDisplay iEglDisplay
EGLSurface iEglSurface
EGLContext iEglContext
CPeriodic * iPeriodic
TBool iOpenGlInitialized

Detailed Description

Container control class that handles the OpenGL ES initialization and deinitializations. Also uses the CSimpleLight class to do the actual OpenGL ES rendering.

Definition at line 31 of file SimpleLightContainer.h.

Constructor & Destructor Documentation

CSimpleLightContainer::~CSimpleLightContainer (   )  [virtual]
 

Destructor. Destroys the CPeriodic, CSimpleLight and uninitializes OpenGL ES.

Definition at line 165 of file SimpleLightContainer.cpp.

References CSimpleLight::AppExit(), iEglContext, iEglDisplay, iEglSurface, iPeriodic, and iSimpleLight.

00166     {
00167     delete iPeriodic;
00168 
00169     if ( iSimpleLight )
00170         {
00171         iSimpleLight->AppExit();
00172         delete iSimpleLight;
00173         }
00174     
00175     eglMakeCurrent( iEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT );
00176     eglDestroySurface( iEglDisplay, iEglSurface ); 
00177     eglDestroyContext( iEglDisplay, iEglContext );
00178     eglTerminate( iEglDisplay );                   // Release resources associated
00179                                                    // with EGL and OpenGL ES
00180     }

Member Function Documentation

void CSimpleLightContainer::ConstructL (  const TRect &  aRect  ) 
 

EPOC default constructor. Initializes the OpenGL ES and creates the rendering context.

Parameters:
aRect Screen rectangle for container.

Definition at line 27 of file SimpleLightContainer.cpp.

References CSimpleLight::AppInit(), DrawCallBack(), iEglContext, iEglDisplay, iEglSurface, iFrame, iOpenGlInitialized, iPeriodic, iSimpleLight, and CSimpleLight::NewL().

00028     {
00029     CreateWindowL();
00030     iOpenGlInitialized = EFalse;
00031 
00032     SetExtentToWholeScreen();                // Take the whole screen into use
00033     ActivateL();
00034 
00035     iFrame = 0;                              // Frame counter
00036     
00037     EGLConfig Config;                        // Describes the format, type and 
00038                                              // size of the color buffers and
00039                                              // ancillary buffers for EGLSurface
00040 
00041     // Get the display for drawing graphics
00042     iEglDisplay = eglGetDisplay( EGL_DEFAULT_DISPLAY );
00043     if ( iEglDisplay == NULL )
00044         {
00045         _LIT(KGetDisplayFailed, "eglGetDisplay failed");
00046         User::Panic( KGetDisplayFailed, 0 );
00047         }
00048     
00049     // Initialize display 
00050     if ( eglInitialize( iEglDisplay, NULL, NULL ) == EGL_FALSE )
00051         {
00052         _LIT(KInitializeFailed, "eglInitialize failed");
00053         User::Panic( KInitializeFailed, 0 );
00054         }
00055     
00056     EGLConfig *configList = NULL;            // Pointer for EGLConfigs
00057     EGLint numOfConfigs = 0; 
00058     EGLint configSize   = 0;
00059 
00060     // Get the number of possible EGLConfigs 
00061     if ( eglGetConfigs( iEglDisplay, configList, configSize, &numOfConfigs ) 
00062         == EGL_FALSE )
00063         {
00064         _LIT(KGetConfigsFailed, "eglGetConfigs failed");
00065         User::Panic( KGetConfigsFailed, 0 );
00066         }
00067     
00068     configSize = numOfConfigs;
00069 
00070     // Allocate memory for the configList 
00071     configList = (EGLConfig*) User::Alloc( sizeof(EGLConfig)*configSize );
00072     if ( configList == NULL )
00073         {
00074         _LIT(KConfigAllocFailed, "config alloc failed");
00075         User::Panic( KConfigAllocFailed, 0 );
00076         }
00077     
00078     /* Define properties for the wanted EGLSurface.
00079        To get the best possible performance, choose
00080        an EGLConfig with a buffersize matching
00081        the current window's display mode*/
00082     TDisplayMode DMode = Window().DisplayMode();
00083     TInt BufferSize = 0;
00084 
00085     switch ( DMode )
00086          {
00087          case(EColor4K):
00088              BufferSize = 12;
00089              break;
00090          case(EColor64K):
00091              BufferSize = 16;
00092              break;
00093          case(EColor16M):
00094              BufferSize = 24;
00095              break;
00096          case(EColor16MU):
00097              BufferSize = 32;
00098              break;
00099          default:
00100              _LIT(KDModeError,       "unsupported displaymode");
00101              User::Panic( KDModeError, 0 );
00102              break;
00103          }
00104 
00105     // Define properties for the wanted EGLSurface 
00106     const EGLint attrib_list[] = { EGL_BUFFER_SIZE,BufferSize,   
00107                                    EGL_DEPTH_SIZE,16,    // 16-bit depthbuffer
00108                                    EGL_NONE };
00109 
00110     // Choose an EGLConfig that best matches to the properties in attrib_list 
00111     if ( eglChooseConfig( iEglDisplay, attrib_list, configList, configSize, 
00112                          &numOfConfigs ) == EGL_FALSE )
00113         {
00114         _LIT(KChooseConfigFailed, "eglChooseConfig failed");
00115         User::Panic( KChooseConfigFailed, 0 );
00116         }
00117     
00118     Config = configList[0];   // Choose the best EGLConfig. EGLConfigs 
00119                               // returned by eglChooseConfig are sorted so 
00120                               // that the best matching EGLConfig is first in
00121                               // the list.
00122     User::Free( configList ); // Free configList, not used anymore.
00123 
00124     // Create a window where the graphics are blitted 
00125     iEglSurface = eglCreateWindowSurface( iEglDisplay, Config, &Window(), NULL );
00126     if ( iEglSurface == NULL )
00127         {
00128         _LIT(KCreateWindowSurfaceFailed, "eglCreateWindowSurface failed");
00129         User::Panic( KCreateWindowSurfaceFailed, 0 );
00130         }
00131     
00132     // Create a rendering context 
00133     iEglContext = eglCreateContext( iEglDisplay, Config, EGL_NO_CONTEXT, NULL );
00134     if ( iEglContext == NULL )
00135         {
00136         _LIT(KCreateContextFailed, "eglCreateContext failed");
00137         User::Panic( KCreateContextFailed, 0 );
00138         }
00139     
00140     /* Make the context current. Binds context to the current rendering thread
00141        and surface.*/
00142     if ( eglMakeCurrent( iEglDisplay, iEglSurface, iEglSurface, iEglContext ) 
00143         == EGL_FALSE )
00144         {
00145         _LIT(KMakeCurrentFailed, "eglMakeCurrent failed");
00146         User::Panic( KMakeCurrentFailed, 0 );
00147         }
00148     
00149 
00150     TSize size;
00151     size = this->Size();
00152 
00153     iSimpleLight = CSimpleLight::NewL( size.iWidth, size.iHeight ); // Create an instance of SimpleLight
00154     iSimpleLight->AppInit();                                       // Initialize OpenGL ES
00155 
00156     iOpenGlInitialized = ETrue;
00157     
00158     iPeriodic = CPeriodic::NewL( CActive::EPriorityIdle );         // Create an active object for
00159                                                                   // animating the scene
00160     iPeriodic->Start( 100, 100, 
00161                       TCallBack( CSimpleLightContainer::DrawCallBack, this ) );
00162     }

int CSimpleLightContainer::DrawCallBack (  TAny *  aInstance  )  [static]
 

Callback function for the CPeriodic. Calculates the current frame, keeps the background light from turning off and orders the CSimpleLight to do the rendering for each frame.

Parameters:
aInstance Pointer to this instance of CSimpleLightContainer.

Definition at line 248 of file SimpleLightContainer.cpp.

References CSimpleLight::AppCycle(), iEglDisplay, iEglSurface, iFrame, and iSimpleLight.

00249     {
00250     CSimpleLightContainer* instance = (CSimpleLightContainer*) aInstance;
00251     instance->iFrame++;
00252     
00253     // Call the main OpenGL ES Symbian rendering 'loop' 
00254     instance->iSimpleLight->AppCycle( instance->iFrame );
00255     
00256     // Call eglSwapBuffers, which blit the graphics to the window 
00257     eglSwapBuffers( instance->iEglDisplay, instance->iEglSurface );
00258 
00259     // To keep the background light on 
00260     if ( !(instance->iFrame%100) )
00261         {
00262         User::ResetInactivityTime();
00263         }
00264     
00265     /* Suspend the current thread for a short while. Give some time 
00266        to other threads and AOs, avoids the ViewSrv error in ARMI and
00267        THUMB release builds. One may try to decrease the callback 
00268        function instead of this. */ 
00269     if ( !(instance->iFrame%50) )
00270          {
00271          User::After(0);
00272          }
00273     
00274     return 0;
00275     }

void CSimpleLightContainer::SizeChanged (   )  [private]
 

Method from CoeControl that gets called when the display size changes. If OpenGL has been initialized, notifies the renderer class that the screen size has changed.

Definition at line 187 of file SimpleLightContainer.cpp.

References iOpenGlInitialized, iSimpleLight, and CSimpleLight::SetScreenSize().

00188     {
00189     if( iOpenGlInitialized && iSimpleLight )
00190         {
00191         TSize size;
00192         size = this->Size();
00193         
00194         iSimpleLight->SetScreenSize( size.iWidth, size.iHeight );
00195         }
00196     }

void CSimpleLightContainer::HandleResourceChange (  TInt  aType  )  [private]
 

Handles a change to the control's resources. This method reacts to the KEikDynamicLayoutVariantSwitch event (that notifies of screen size change) by calling the SetExtentToWholeScreen() again so that this control fills the new screen size. This will then trigger a call to the SizeChanged() method.

Parameters:
aType Message UID value, only KEikDynamicLayoutVariantSwitch is handled by this method.

Definition at line 206 of file SimpleLightContainer.cpp.

00207     {
00208         switch( aType )
00209         {
00210             case KEikDynamicLayoutVariantSwitch:
00211                     SetExtentToWholeScreen();
00212                     break;
00213             }
00214     }

TInt CSimpleLightContainer::CountComponentControls (   )  const [private]
 

Method from CoeControl. Does nothing in this implementation.

Definition at line 220 of file SimpleLightContainer.cpp.

00221     {
00222     return 0; // return nbr of controls inside this container
00223     }

CCoeControl * CSimpleLightContainer::ComponentControl (  TInt  aIndex  )  const [private]
 

Method from CCoeControl. Does nothing in this implementation.

Definition at line 229 of file SimpleLightContainer.cpp.

00230     {
00231     return NULL;    
00232     }

void CSimpleLightContainer::Draw (  const TRect &  aRect  )  const [private]
 

Method from CCoeControl. Does nothing in this implementation. All rendering is done in the DrawCallBack() method.

Definition at line 238 of file SimpleLightContainer.cpp.

00239     {
00240     // No need to implement anything here!
00241     }

void CSimpleLightContainer::HandleControlEventL (  CCoeControl *  aControl,
TCoeEvent  aEventType
)  [private]
 

Method from MCoeControlObserver that handles an event from the observed control. Does nothing in this implementation.

Parameters:
aControl Control changing its state.
aEventType Type of the control event.

Definition at line 282 of file SimpleLightContainer.cpp.

00284     {
00285     }

Member Data Documentation

EGLDisplay CSimpleLightContainer::iEglDisplay [private]
 

Display where the OpenGL ES window surface resides.

Definition at line 101 of file SimpleLightContainer.h.

EGLSurface CSimpleLightContainer::iEglSurface [private]
 

Window surface that is the target of OpenGL ES graphics rendering.

Definition at line 104 of file SimpleLightContainer.h.

EGLContext CSimpleLightContainer::iEglContext [private]
 

OpenGL ES rendering context.

Definition at line 107 of file SimpleLightContainer.h.

CPeriodic* CSimpleLightContainer::iPeriodic [private]
 

Active object that is the timing source for the animation.

Definition at line 110 of file SimpleLightContainer.h.

TBool CSimpleLightContainer::iOpenGlInitialized [private]
 

Flag that indicates if OpenGL ES has been initialized or not. Used to check if SizeChanged() can react to incoming notifications.

Definition at line 116 of file SimpleLightContainer.h.

TInt CSimpleLightContainer::iFrame
 

Frame counter variable, used in the animation.

Definition at line 121 of file SimpleLightContainer.h.

CSimpleLight* CSimpleLightContainer::iSimpleLight
 

Used in DrawCallBack() method to do the actual OpenGL ES rendering.

Definition at line 124 of file SimpleLightContainer.h.

© Nokia 2006

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