1 /*

     2  * Copyright (C) 2009 Apple Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 #ifndef WebGLFramebuffer_h

    27 #define WebGLFramebuffer_h

    28 

    29 #include "CanvasObject.h"

    30 

    31 #include <wtf/PassRefPtr.h>

    32 #include <wtf/RefCounted.h>

    33 

    34 namespace WebCore {

    35 

    36     class WebGLFramebuffer : public CanvasObject {

    37     public:

    38         virtual ~WebGLFramebuffer() { deleteObject(); }

    39         

    40         static PassRefPtr<WebGLFramebuffer> create(WebGLRenderingContext*);

    41 

    42         bool isDepthAttached() const { return (m_depthAttachment && m_depthAttachment->object()); }

    43         bool isStencilAttached() const { return (m_stencilAttachment && m_stencilAttachment->object()); }

    44         bool isDepthStencilAttached() const { return (m_depthStencilAttachment && m_depthStencilAttachment->object()); }

    45 

    46         void setAttachment(unsigned long, CanvasObject*);

    47 

    48         // This function is called right after a framebuffer is bound.

    49         // Because renderbuffers and textures attached to the framebuffer might

    50         // have changed and the framebuffer might have become complete when it

    51         // isn't bound, so we need to clear un-initialized renderbuffers.

    52         void onBind();

    53 

    54         // When a texture or a renderbuffer changes, we need to check the

    55         // current bound framebuffer; if the newly changed object is attached

    56         // to the framebuffer and the framebuffer becomes complete, we need to

    57         // clear un-initialized renderbuffers.

    58         void onAttachedObjectChange(CanvasObject*);

    59 

    60         unsigned long getColorBufferFormat();

    61 

    62     protected:

    63         WebGLFramebuffer(WebGLRenderingContext*);

    64         

    65         virtual void _deleteObject(Platform3DObject);

    66 

    67     private:

    68         virtual bool isFramebuffer() const { return true; }

    69 

    70         bool isUninitialized(CanvasObject*);

    71         void setInitialized(CanvasObject*);

    72         void initializeRenderbuffers();

    73 

    74         // These objects are kept alive by the global table in

    75         // WebGLRenderingContext.

    76         CanvasObject* m_colorAttachment;

    77         CanvasObject* m_depthAttachment;

    78         CanvasObject* m_stencilAttachment;

    79         CanvasObject* m_depthStencilAttachment;

    80     };

    81     

    82 } // namespace WebCore

    83 

    84 #endif // WebGLFramebuffer_h