C++ QOpenGLContext::shareGroup方法代码示例

/*!
   \fn GLuint QOpenGLFramebufferObject::takeTexture()

   Returns the texture id for the texture attached to this framebuffer
   object. The ownership of the texture is transferred to the caller.

   If the framebuffer object is currently bound, an implicit release()
   will be done. During the next call to bind() a new texture will be
   created.

   If a multisample framebuffer object is used, then there is no
   texture and the return value from this function will be invalid.
   Similarly, incomplete framebuffer objects will also return 0.

   \since 5.3

   \sa texture(), bind(), release()
 */
GLuint QOpenGLFramebufferObject::takeTexture()
{
    Q_D(QOpenGLFramebufferObject);
    GLuint id = 0;
    if (isValid() && d->texture_guard) {
        QOpenGLContext *current = QOpenGLContext::currentContext();
        if (current && current->shareGroup() == d->fbo_guard->group() && current->d_func()->current_fbo == d->fbo())
            release();
        id = d->texture_guard->id();
        // Do not call free() on texture_guard, just null it out.
        // This way the texture will not be deleted when the guard is destroyed.
        d->texture_guard = 0;
    }
    return id;
}

/*!
    Sets the attachments of the framebuffer object to \a attachment.

    This can be used to free or reattach the depth and stencil buffer
    attachments as needed.
 */
void QOpenGLFramebufferObject::setAttachment(QOpenGLFramebufferObject::Attachment attachment)
{
    Q_D(QOpenGLFramebufferObject);
    if (attachment == d->fbo_attachment || !isValid())
        return;
    QOpenGLContext *current = QOpenGLContext::currentContext();
    if (!current)
        return;
#ifdef QT_DEBUG
    if (current->shareGroup() != d->fbo_guard->group())
        qWarning("QOpenGLFramebufferObject::setAttachment() called from incompatible context");
#endif
    d->funcs.glBindFramebuffer(GL_FRAMEBUFFER, d->fbo());
    d->initAttachments(current, attachment);
    if (current->d_func()->current_fbo != d->fbo())
        d->funcs.glBindFramebuffer(GL_FRAMEBUFFER, current->d_func()->current_fbo);
}

/*!
    \fn bool QOpenGLFramebufferObject::bind()

    Switches rendering from the default, windowing system provided
    framebuffer to this framebuffer object.
    Returns \c true upon success, false otherwise.

    \note If takeTexture() was called, a new texture is created and associated
    with the framebuffer object. This is potentially expensive and changes the
    context state (the currently bound texture).

    \sa release()
*/
bool QOpenGLFramebufferObject::bind()
{
    if (!isValid())
        return false;
    Q_D(QOpenGLFramebufferObject);
    QOpenGLContext *current = QOpenGLContext::currentContext();
    if (!current)
        return false;
#ifdef QT_DEBUG
    if (current->shareGroup() != d->fbo_guard->group())
        qWarning("QOpenGLFramebufferObject::bind() called from incompatible context");
#endif
    d->funcs.glBindFramebuffer(GL_FRAMEBUFFER, d->fbo());
    if (d->texture_guard || d->format.samples() != 0)
        d->valid = d->checkFramebufferStatus(current);
    else
        d->initTexture(d->format.textureTarget(), d->format.internalTextureFormat(), d->size, d->format.mipmap());
    if (d->valid && current)
        current->d_func()->current_fbo = d->fbo();
    return d->valid;
}

/*!
    \fn bool QOpenGLFramebufferObject::release()

    Switches rendering back to the default, windowing system provided
    framebuffer.
    Returns \c true upon success, false otherwise.

    \sa bind()
*/
bool QOpenGLFramebufferObject::release()
{
    if (!isValid())
        return false;

    QOpenGLContext *current = QOpenGLContext::currentContext();
    if (!current)
        return false;

    Q_D(QOpenGLFramebufferObject);
#ifdef QT_DEBUG
    if (current->shareGroup() != d->fbo_guard->group())
        qWarning("QOpenGLFramebufferObject::release() called from incompatible context");
#endif

    if (current) {
        current->d_func()->current_fbo = current->defaultFramebufferObject();
        d->funcs.glBindFramebuffer(GL_FRAMEBUFFER, current->d_func()->current_fbo);
    }

    return true;
}