Merge "Discard the correct buffer when the bound FBO is not 0"

    // the back buffer for this frame.

    if (mCaches.extensions.hasDiscardFramebuffer() &&

            left <= 0.0f && top <= 0.0f && right >= mWidth && bottom >= mHeight) {

        const GLenum attachments[] = { getTargetFbo() == 0 ? (const GLenum) GL_COLOR_EXT :

                (const GLenum) GL_COLOR_ATTACHMENT0, GL_STENCIL_EXT };

        const bool isFbo = getTargetFbo() == 0;

        const GLenum attachments[] = {

                isFbo ? (const GLenum) GL_COLOR_EXT : (const GLenum) GL_COLOR_ATTACHMENT0,

                isFbo ? (const GLenum) GL_STENCIL_EXT : (const GLenum) GL_STENCIL_ATTACHMENT };

        glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, attachments);

    }

}