examples/Graphics/coverflow/src/eglrendering.cpp

Go to the documentation of this file.

/*
Copyright (c) 2005-2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
� list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
� this list of conditions and the following disclaimer in the documentation
� and/or other materials provided with the distribution.
* Neither the name of Nokia Corporation nor the names of its contributors
� may be used to endorse or promote products derived from this software
� without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Description:� 
*/
#include <eikenv.h>
#include <string.h>
#include "eglrendering.h"
#include "engine.h"
#include "openvgengine.h"
#include <hal.h>

const EGLint    KColorRGB565AttribList[] =
                {
                EGL_RED_SIZE,                   5,
                EGL_GREEN_SIZE,                 6,
                EGL_BLUE_SIZE,                  5,
                EGL_SURFACE_TYPE,               EGL_WINDOW_BIT,
                EGL_RENDERABLE_TYPE,    EGL_OPENVG_BIT,
                EGL_NONE
                };

CEGLRendering* CEGLRendering::NewL(RWindow& aWindow)
        {
        CEGLRendering* self = CEGLRendering::NewLC(aWindow);
        CleanupStack::Pop(self);
        return self;
        }

CEGLRendering* CEGLRendering::NewLC(RWindow& aWindow)
        {
        CEGLRendering* self = new(ELeave) CEGLRendering(aWindow);
        CleanupStack::PushL(self);
        self->ConstructL();
        return self;
        }

CEGLRendering::~CEGLRendering()
        {
        // Stop the timer object.
        Stop();
        delete iTimer;

        if(iCurrentDemo)
                {
                // Deactivate the active drawing surface.
                iCurrentDemo->Deactivate();
                }
        delete iCurrentDemo;

        if (iContextVG!=EGL_NO_CONTEXT)
                {
                EGLCheckReturnError(eglDestroyContext(iDisplay,iContextVG));
                }

        if (iSurface!=EGL_NO_SURFACE)
                {
                EGLCheckReturnError(eglDestroySurface(iDisplay,iSurface));
                }

        EGLCheckReturnError(eglTerminate(iDisplay));
        EGLCheckReturnError(eglReleaseThread());

        delete iBitmap;
        }

void CEGLRendering::Start()
        {
        // Start drawing the screen periodically
        iTimer->Start(0, KTimerDelay, TCallBack(TimerCallBack,this));
        }

void CEGLRendering::Stop()
        {
        if(iTimer)
                {
                iTimer->Cancel();
                }
        }

void CEGLRendering::EGLCheckError()
        {
        EGLint error = eglGetError();
        if(error != EGL_SUCCESS)
                {
                User::Panic(_L("EGL error"), error);
                }
        }

void CEGLRendering::VGCheckError()
        {
        VGint error = vgGetError();
        if(error != VG_NO_ERROR)
                {
                User::Panic(_L("OpenVG error"), error);
                }
        }

void CEGLRendering::EGLCheckReturnError(EGLBoolean aBool)
        {
        if (!aBool)
                {
                User::Panic(_L("EGL return error"),eglGetError());
                }
        }

CEGLRendering::CEGLRendering(RWindow& aWindow)
        : iWindow(aWindow)
        {
        }

TKeyResponse CEGLRendering::HandleKeyEventL(const TKeyEvent& aKeyEvent)
        {
        TKeyResponse response = EKeyWasConsumed;
        switch (aKeyEvent.iCode)
                {
        case EKeySpace:
        // Handle the space bar key press event.
        // Stop the timer if it is active.
        // Start the timer if it is not active.
                iTimer->IsActive()? Stop() : Start();
                break;
        // Do nothing for tab, up arrow and down arrow key press events.
        case EKeyTab:
                break;
        case EKeyUpArrow:
                break;
        case EKeyDownArrow:
                break;
        case EKeyBackspace:
        // Stop displaying mirror images of the cover if backspace key is pressed.
                iShowMirrorToggled = ETrue;
        default:
                response = iCurrentDemo->HandleKeyEventL(aKeyEvent);
                break;
                };
        return response;
        }

void CEGLRendering::ConstructL()
    {
        // Refresh the timer.
        iTimer = CPeriodic::NewL(CActive::EPriorityIdle);

        const TSize windowSize(iWindow.Size());

        // Create the display object.
        iDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
        EGLCheckError();

        // Initialise the display object.
        EGLint iMajor, iMinor;
        // initialise the EGL display connection.
        EGLCheckReturnError(eglInitialize(iDisplay, &iMajor, &iMinor));
        RDebug::Printf("Vendor string %s", eglQueryString(iDisplay, EGL_VENDOR));
        RDebug::Printf("Version string %s", eglQueryString(iDisplay, EGL_VERSION));

        if ( NULL == strstr(eglQueryString(iDisplay, EGL_CLIENT_APIS), "OpenVG") )
                {
                RDebug::Printf("OpenVG not listed in supported client APIs %s", eglQueryString(iDisplay, EGL_CLIENT_APIS));
                }
        if ( NULL == strstr(eglQueryString(iDisplay, EGL_EXTENSIONS), "EGL_SYMBIAN_COMPOSITION") )
                {
                CEikonEnv::Static()->InfoMsg(_L("Graphics Composition is not supported in this SymbianOS version"));
                RDebug::Printf("EGL_SYMBIAN_COMPOSITION not listed in extension string %s", eglQueryString(iDisplay, EGL_EXTENSIONS));
                User::Leave(KErrNotSupported);
                }

        // Query the available number of configurations .
        EGLint numConfigs;
        // Get a list of all EGL frame buffer configurations for iDisplay.
        EGLCheckReturnError(eglGetConfigs(iDisplay, iConfig, KMaxConfigs, &numConfigs));

        // Choose the configuration to use
        EGLCheckReturnError(eglChooseConfig(iDisplay, KColorRGB565AttribList, iConfig, 1, &numConfigs));
        EGLCheckReturnError(eglBindAPI(EGL_OPENVG_API));

        // Create window surface to draw direct to.
        // Contents drawn on the iSurface will be directed to iWindow.
        iSurface = eglCreateWindowSurface(iDisplay, iConfig[0], &iWindow, NULL);
        EGLCheckError();

        TInt redSize, greenSize, blueSize, alphaSize;
        // Gets the information about the number of bits of alpha stored in the colour buffer.
        EGLCheckReturnError(eglGetConfigAttrib(iDisplay, iConfig[0], EGL_ALPHA_SIZE, &alphaSize));
        EGLCheckReturnError(eglGetConfigAttrib(iDisplay, iConfig[0], EGL_RED_SIZE, &redSize));
        EGLCheckReturnError(eglGetConfigAttrib(iDisplay, iConfig[0], EGL_GREEN_SIZE, &greenSize));
        EGLCheckReturnError(eglGetConfigAttrib(iDisplay, iConfig[0], EGL_BLUE_SIZE, &blueSize));
        RDebug::Print(_L("EGLConfig id:%d alpha:%d red:%d green:%d blue:%d"), iConfig[0],
                        alphaSize, redSize, greenSize, blueSize);

        // Create context to store surface settings
        iContextVG = eglCreateContext(iDisplay, iConfig[0], NULL, NULL);
        EGLCheckError();

        CEGLRendering::EGLCheckReturnError(eglMakeCurrent(iDisplay, iSurface, iSurface, iContextVG));
        iCurrentDemo = COpenVGEngine::NewL(windowSize,iDisplay,iSurface,iContextVG);
        iCurrentDemo->ActivateL();

        User::LeaveIfError(HAL::Get(HAL::EFastCounterFrequency, iFastCounterFrequency));
        }


void CEGLRendering::UpdateDisplay()
        {
        // Guard against unexpected re-entrant problem.
        if (iBusySwapping)
                {
                return;
                }

        if (iCurrentDemo->IsPending() || (!iCurrentDemo->IsPending() && iShowMirrorToggled))
                {
                iShowMirrorToggled = EFalse;

                // Updates the contents of the iDisplay.
                iCurrentDemo->Step();
                iBusySwapping = ETrue;

                // Flush colour buffer to the window surface.
                CEGLRendering::EGLCheckReturnError(eglSwapBuffers(iDisplay, iSurface));
                iBusySwapping = EFalse;

                TUint currentTimeStamp = User::FastCounter();
                TReal delta = currentTimeStamp - iLastFrameTimeStamp;

                TReal measuredFrameRate = static_cast<TReal>(iFastCounterFrequency/delta);

                iLastFrameTimeStamp = currentTimeStamp;
                RDebug::Printf("[Timestamp: %d FrameRate: %f]", iLastFrameTimeStamp, measuredFrameRate);
                }
        }

TInt CEGLRendering::TimerCallBack(TAny* aDemo)
        {
        static_cast<CEGLRendering*>(aDemo)->UpdateDisplay();
        return KErrNone;
        }

---