S60 3rd Edition SDK for Symbian OS Example Applications Guide

MultiTexContainer.cpp

/*
* ==============================================================================
*  Name        : MultiTexContainer.cpp
*  Part of     : OpenGLEx / MultiTex
*  Interface   : 
*  Description : 
*  Version     : 
*
*  Copyright (c) 2004-2006 Nokia Corporation.
*  This material, including documentation and any related 
*  computer programs, is protected by copyright controlled by 
*  Nokia Corporation.
* ==============================================================================
*/


// INCLUDE FILES
#include <Eikenv.h>
#include <w32std.h>

#include "MultiTexContainer.h"

// ================= MEMBER FUNCTIONS =======================

// ---------------------------------------------------------
// CMultiTexContainer::ConstructL(const TRect& aRect)
// EPOC two phased constructor
// ---------------------------------------------------------
//
void CMultiTexContainer::ConstructL(const TRect& /*aRect*/)
{
    iOpenGlInitialized = EFalse;
    CreateWindowL();
    
    SetExtentToWholeScreen();                // Take the whole screen into use
    ActivateL();
    
    iFrame = 0;                              // Initialize frame counter
    
    EGLConfig config;                       // Describes the format, type and 
                                             // size of the color buffers and
                                             // ancillary buffers for EGLSurface
    
    // Get the display for drawing graphics
    iEglDisplay = eglGetDisplay( EGL_DEFAULT_DISPLAY );
    if ( iEglDisplay == NULL )
    {
        _LIT(KGetDisplayFailed, "eglGetDisplay failed");
        User::Panic( KGetDisplayFailed, 0 );
    }
    
    // Initialize display 
    if ( eglInitialize( iEglDisplay, NULL, NULL ) == EGL_FALSE )
    {
        _LIT(KInitializeFailed, "eglInitialize failed");
        User::Panic( KInitializeFailed, 0 );
    }
    
    EGLConfig *configList = NULL;            // Pointer for EGLConfigs
    TInt numOfConfigs = 0; 
    TInt configSize   = 0;
    
    // Get the number of possible EGLConfigs 
    if ( eglGetConfigs( iEglDisplay, configList, configSize, &numOfConfigs ) 
         == EGL_FALSE )
    {
        _LIT(KGetConfigsFailed, "eglGetConfigs failed");
        User::Panic( KGetConfigsFailed, 0 );
    }
    
    configSize = numOfConfigs;
    
    // Allocate memory for the configList 
    configList = (EGLConfig*) User::Alloc( sizeof(EGLConfig)*configSize );
    if ( configList == NULL )
    {
        _LIT(KConfigAllocFailed, "config alloc failed");
        User::Panic( KConfigAllocFailed, 0 );
    }
    
    /* Define properties for the wanted EGLSurface 
       To get the best possible performance, choose
       an EGLConfig with a buffersize matching
       the current window's display mode*/
    TDisplayMode DMode = Window().DisplayMode();
    TInt BufferSize = 0;
    
    switch ( DMode )
    {
    case(EColor4K):
        BufferSize = 12;
        break;
    case(EColor64K):
        BufferSize = 16;
        break;
    case(EColor16M):
        BufferSize = 24;
        break;
    case(EColor16MU):
        BufferSize = 32;
        break;
    default:
        _LIT(KDModeError,       "unsupported displaymode");
        User::Panic( KDModeError, 0 );
        break;
    }
    
    // Define properties for the wanted EGLSurface 
    const EGLint attrib_list_Pbuffer[] = { EGL_BUFFER_SIZE,
                                           BufferSize,
                                           EGL_SURFACE_TYPE,
                                           EGL_PBUFFER_BIT,
                                           EGL_NONE };
    
    
    // Choose an EGLConfig that best matches to the properties in attrib_list 
    if ( eglChooseConfig( iEglDisplay, attrib_list_Pbuffer, configList, configSize, 
                          &numOfConfigs ) == EGL_FALSE )
    {
        _LIT(KChooseConfigFailed, "eglChooseConfig failed");
        User::Panic( KChooseConfigFailed, 0 );
    }
    
    config = configList[0];     // Choose the best EGLConfig. EGLConfigs 
                                 // returned by eglChooseConfig are sorted so 
                                 // that the best matching EGLConfig is first in
                                 // the list.

    // Create Pbuffer surface
    const EGLint attrib_list2[] = { EGL_WIDTH,
                                    128,
                                    EGL_HEIGHT,
                                    128,
                                    EGL_NONE };
    
    iEglPbufferSurface = eglCreatePbufferSurface( iEglDisplay, config, attrib_list2 );
    
    if ( iEglPbufferSurface == NULL )
    {
        _LIT(KCreatePbufferSurfaceFailed, "eglCreatePbufferSurface failed");
        User::Panic( KCreatePbufferSurfaceFailed, 0 );
    }
    
    // Create a Pbuffer context 
    iEglPbufferContext = eglCreateContext( iEglDisplay, config, EGL_NO_CONTEXT, NULL );
    if ( iEglPbufferContext == NULL )
    {
        _LIT(KCreateContextFailed, "eglCreateContext failed");
        User::Panic( KCreateContextFailed, 0 );
    }
    
    // Define properties for the another EGLSurface 
    const EGLint attrib_list_window[] = { EGL_BUFFER_SIZE,
                                          BufferSize,
                                          EGL_DEPTH_SIZE,
                                          16,              //16-bit depth-buffer
                                          EGL_NONE };
    
    // Choose an EGLConfig that best matches to the properties in attrib_list 
    if ( eglChooseConfig( iEglDisplay, attrib_list_window, configList, configSize, 
                          &numOfConfigs ) == EGL_FALSE )
    {
        _LIT(KChooseConfigFailed, "eglChooseConfig failed");
        User::Panic( KChooseConfigFailed, 0 );
    }
    
    config = configList[0];    // Choose the best EGLConfig. EGLConfigs 
                                // returned by eglChooseConfig are sorted so 
                                // that the best matching EGLConfig is first in
                                // the list.
    
    User::Free( configList ); // Free configList, not used anymore.
    
    // Create window surface
    iEglSurface = eglCreateWindowSurface( iEglDisplay, config, &Window(), NULL );
    
    if ( iEglSurface == NULL )
    {
        _LIT(KCreateWindowSurfaceFailed, "eglCreateWindowSurface failed");
        User::Panic( KCreateWindowSurfaceFailed, 0 );
    }
    
    
    // Create a window context 
    iEglContext = eglCreateContext( iEglDisplay, config, iEglPbufferContext, NULL );
    if ( iEglContext == NULL )
    {
        _LIT(KCreateContextFailed, "eglCreateContext failed");
        User::Panic( KCreateContextFailed, 0 );
    }
    
    TSize size;
    size = this->Size();
    
    iMultiTex = CMultiTex::NewL( size.iWidth, size.iHeight ); // Create an instance of MultiTex
    iMultiTex->AppInitL( this );

    iOpenGlInitialized = ETrue;

    iPeriodic = CPeriodic::NewL( CActive::EPriorityIdle );    // Create an active object for
                                                              // animating the scene
    
    iPeriodic->Start( 100, 100, TCallBack( CMultiTexContainer::DrawCallBack, this ) );
}

// Destructor
CMultiTexContainer::~CMultiTexContainer()
{
    delete iPeriodic;
    
    /* AppExit call is made to release 
       any allocations made in AppInit. */
    if ( iMultiTex )
    {
        iMultiTex->AppExit();
        delete iMultiTex;
    }
    
    eglMakeCurrent( iEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT );
    eglDestroySurface( iEglDisplay, iEglSurface ); 
    eglDestroySurface( iEglDisplay, iEglPbufferSurface ); 
    eglDestroyContext( iEglDisplay, iEglContext );
    eglTerminate( iEglDisplay );                   // Release resources associated
    // with EGL and OpenGL ES
}

// ---------------------------------------------------------
// CMultiTexContainer::SizeChanged()
// Called by framework when the view size is changed
// ---------------------------------------------------------
//
void CMultiTexContainer::SizeChanged()
    {
    if( iOpenGlInitialized && iMultiTex )
        {
        TSize size;
        size = this->Size();
        
        iMultiTex->SetScreenSize( size.iWidth, size.iHeight );
        }
    }


// ---------------------------------------------------------
// CMultiTexContainer::HandleResourceChange(
//     TInt aType)
// Dynamic screen resize changes by calling the
// SetExtentToWholeScreen() method again.
// ---------------------------------------------------------
//
 void CMultiTexContainer::HandleResourceChange(TInt aType)
    {
        switch( aType )
        {
            case KEikDynamicLayoutVariantSwitch:
                    SetExtentToWholeScreen();
                    break;
            }
    }


// ---------------------------------------------------------
// CMultiTexContainer::CountComponentControls() const
// ---------------------------------------------------------
//
TInt CMultiTexContainer::CountComponentControls() const
{
    return 0;
}

// ---------------------------------------------------------
// CMultiTexContainer::ComponentControl(TInt aIndex) const
// ---------------------------------------------------------
//
CCoeControl* CMultiTexContainer::ComponentControl(TInt /*aIndex*/ ) const
{
    return NULL;
}

// ---------------------------------------------------------
// CMultiTexContainer::Draw(const TRect& aRect) const
// ---------------------------------------------------------
//
void CMultiTexContainer::Draw(const TRect& /*aRect*/ ) const
{
        CWindowGc& gc = SystemGc();
    gc.Clear( Rect() );
}

// ---------------------------------------------------------
// CMultiTexContainer::DrawCallBack( TAny* aInstance )
// Called by the CPeriodic in order to draw the graphics 
// ---------------------------------------------------------
//
TInt CMultiTexContainer::DrawCallBack( TAny* aInstance )
{
    CMultiTexContainer* instance = (CMultiTexContainer*) aInstance;
    
    if ( instance->iMultiTex->GetState() == CMultiTex::ERunning )
    {
        instance->iFrame++;
        
        /*=========================================================================*/
        /* Start by rendering with Pbuffer context to pbuffer and create the dynamic
           environment map. First, render to pbuffer and then copy the content
           to the second texture (iLightTexObjects[1]).                             */
        /*=========================================================================*/
        eglMakeCurrent( instance->iEglDisplay, instance->iEglPbufferSurface, 
                        instance->iEglPbufferSurface, instance->iEglPbufferContext );
        
        instance->iMultiTex->AppCyclePbuffer( instance->iFrame );

        /*=========================================================================*/
        /* Now that we have the environment map ready, we can render the sphere with
           marble and environment map (dynamic lights) textures                    */
        /*=========================================================================*/
        eglMakeCurrent( instance->iEglDisplay, instance->iEglSurface, 
                        instance->iEglSurface, instance->iEglContext );

        instance->iMultiTex->AppCycleWindow( instance->iFrame );
        
        // Call eglSwapBuffers, which blit the graphics to the window 
        eglSwapBuffers( instance->iEglDisplay, instance->iEglSurface );
        
        // To keep the background light on 
        if ( !(instance->iFrame%100) )
        {
            User::ResetInactivityTime();
        }
        
        /* Suspend the current thread for a short while. Give some time 
           to other threads and AOs, avoids the ViewSrv error in ARMI and
           THUMB release builds. One may try to decrease the callback 
           function instead of this. */ 
        if ( !(instance->iFrame%50) )
        {
            User::After(0);
        }
        
    }
    return 0; 
}

// ---------------------------------------------------------
// CMultiTexContainer::HandleControlEventL(
//     CCoeControl* aControl,TCoeEvent aEventType)
// ---------------------------------------------------------
//
void CMultiTexContainer::HandleControlEventL(
    CCoeControl* /*aControl*/,TCoeEvent /*aEventType*/)
{
}

// End of File  

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© Nokia 2006