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#include <QtGui/qpaintdevice.h>

#include <QtGui/qpixmap.h>

#include <QtGui/qwidget.h>

#include <QtCore/qdebug.h>

#include "qegl_p.h"

// Current GL and VG contexts.  These are used to determine if

// we can avoid an eglMakeCurrent() after a call to lazyDoneCurrent().

// If a background thread modifies the value, the worst that will

// happen is a redundant eglMakeCurrent() in the foreground thread.

static QEglContext * volatile currentGLContext = 0;

static QEglContext * volatile currentVGContext = 0;

QEglContext::QEglContext()

    : apiType(QEgl::OpenGL)

    , ctx(EGL_NO_CONTEXT)

    , currentSurface(EGL_NO_SURFACE)

    , current(false)

    , ownsContext(true)

    , sharing(false)

{

}

QEglContext::~QEglContext()

{

    destroyContext();

    if (currentGLContext == this)

        currentGLContext = 0;

    if (currentVGContext == this)

        currentVGContext = 0;

}

bool QEglContext::isValid() const

{

    return (ctx != EGL_NO_CONTEXT);

}

bool QEglContext::isCurrent() const

{

    return current;

}

// Choose a configuration that matches "properties".

{

    do {

        // Get the number of matching configurations for this set of properties.

        EGLint matching = 0;

            continue;

        // If we want the best pixel format, then return the first

        // matching configuration.

        if (match == QEgl::BestPixelFormat) {

            eglChooseConfig(display(), props.properties(), &cfg, 1, &matching);

            if (matching < 1)

                continue;

        }

        // Fetch all of the matching configurations and find the

        // first that matches the pixel format we wanted.

        EGLint size = matching;

        EGLConfig *configs = new EGLConfig [size];

        eglChooseConfig(display(), props.properties(), configs, size, &matching);

        for (EGLint index = 0; index < size; ++index) {

            EGLint red, green, blue, alpha;

            eglGetConfigAttrib(display(), configs[index], EGL_RED_SIZE, &red);

            eglGetConfigAttrib(display(), configs[index], EGL_GREEN_SIZE, &green);

            eglGetConfigAttrib(display(), configs[index], EGL_BLUE_SIZE, &blue);

            eglGetConfigAttrib(display(), configs[index], EGL_ALPHA_SIZE, &alpha);

            if (red == props.value(EGL_RED_SIZE) &&

                    green == props.value(EGL_GREEN_SIZE) &&

                    blue == props.value(EGL_BLUE_SIZE) &&

                    (props.value(EGL_ALPHA_SIZE) == 0 ||

                     alpha == props.value(EGL_ALPHA_SIZE))) {

                cfg = configs[index];

                delete [] configs;

            }

        }

        delete [] configs;

    } while (props.reduceConfiguration());

#ifdef EGL_BIND_TO_TEXTURE_RGBA

    // Don't report an error just yet if we failed to get a pbuffer

    // configuration with texture rendering.  Only report failure if

    // we cannot get any pbuffer configurations at all.

    if (props.value(EGL_BIND_TO_TEXTURE_RGBA) == EGL_DONT_CARE &&

        props.value(EGL_BIND_TO_TEXTURE_RGB) == EGL_DONT_CARE)

#endif

    {

        qWarning() << "QEglContext::chooseConfig(): Could not find a suitable EGL configuration";

        qWarning() << "Requested:" << props.toString();

        qWarning() << "Available:";

    }

}

// Create the EGLContext.

bool QEglContext::createContext(QEglContext *shareContext, const QEglProperties *properties)

{

    // We need to select the correct API before calling eglCreateContext().

#ifdef EGL_OPENGL_ES_API

    if (apiType == QEgl::OpenGL)

        eglBindAPI(EGL_OPENGL_ES_API);

#endif

#ifdef EGL_OPENVG_API

    if (apiType == QEgl::OpenVG)

        eglBindAPI(EGL_OPENVG_API);

#endif

    // Create a new context for the configuration.

    QEglProperties contextProps;

    if (properties)

        contextProps = *properties;

    if (apiType == QEgl::OpenGL)

        contextProps.setValue(EGL_CONTEXT_CLIENT_VERSION, 2);

#endif

    sharing = false;

    if (shareContext && shareContext->ctx == EGL_NO_CONTEXT)

        shareContext = 0;

    if (shareContext) {

        if (ctx == EGL_NO_CONTEXT) {

            shareContext = 0;

        } else {

            sharing = true;

        }

    }

    if (ctx == EGL_NO_CONTEXT) {

        ctx = eglCreateContext(display(), cfg, 0, contextProps.properties());

        if (ctx == EGL_NO_CONTEXT) {

            return false;

        }

    }

    return true;

}

// Destroy an EGL surface object.  If it was current on this context

// then call doneCurrent() for it first.

void QEglContext::destroySurface(EGLSurface surface)

{

    if (surface != EGL_NO_SURFACE) {

        if (surface == currentSurface)

            doneCurrent();

        eglDestroySurface(display(), surface);

    }

}

// Destroy the context.  Note: this does not destroy the surface.

void QEglContext::destroyContext()

{

    if (ctx != EGL_NO_CONTEXT && ownsContext)

        eglDestroyContext(display(), ctx);

    ctx = EGL_NO_CONTEXT;

    cfg = 0;

}

bool QEglContext::makeCurrent(EGLSurface surface)

{

    if (ctx == EGL_NO_CONTEXT) {

        qWarning() << "QEglContext::makeCurrent(): Cannot make invalid context current";

        return false;

    }

    // If lazyDoneCurrent() was called on the surface, then we may be able

    // to assume that it is still current within the thread.

    if (surface == currentSurface && currentContext(apiType) == this) {

        current = true;

        return true;

    }

    current = true;

    currentSurface = surface;

    setCurrentContext(apiType, this);

    // Force the right API to be bound before making the context current.

    // The EGL implementation should be able to figure this out from ctx,

    // but some systems require the API to be explicitly set anyway.

#ifdef EGL_OPENGL_ES_API

    if (apiType == QEgl::OpenGL)

        eglBindAPI(EGL_OPENGL_ES_API);

#endif

#ifdef EGL_OPENVG_API

    if (apiType == QEgl::OpenVG)

        eglBindAPI(EGL_OPENVG_API);

#endif

    if (!ok)

    return ok;

}

bool QEglContext::doneCurrent()

{

    // If the context is invalid, we assume that an error was reported

    // when makeCurrent() was called.

    if (ctx == EGL_NO_CONTEXT)

        return false;

    current = false;

    currentSurface = EGL_NO_SURFACE;

    setCurrentContext(apiType, 0);

    // We need to select the correct API before calling eglMakeCurrent()

    // with EGL_NO_CONTEXT because threads can have both OpenGL and OpenVG

    // contexts active at the same time.

#ifdef EGL_OPENGL_ES_API

    if (apiType == QEgl::OpenGL)

        eglBindAPI(EGL_OPENGL_ES_API);

#endif

#ifdef EGL_OPENVG_API

    if (apiType == QEgl::OpenVG)

        eglBindAPI(EGL_OPENVG_API);

#endif

    if (!ok)

    return ok;

}

// Act as though doneCurrent() was called, but keep the context

// and the surface active for the moment.  This allows makeCurrent()

// to skip a call to eglMakeCurrent() if we are using the same

// surface as the last set of painting operations.  We leave the

// currentContext() pointer as-is for now.

bool QEglContext::lazyDoneCurrent()

{

    current = false;

    return true;

}

bool QEglContext::swapBuffers(EGLSurface surface)

{

    if(ctx == EGL_NO_CONTEXT)

        return false;

    if (!ok)

    return ok;

}

{

}