1 /*

     2  * Copyright (c) 2010, Google 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 are

     6  * met:

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

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

     9  *     * Redistributions in binary form must reproduce the above

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

    11  * in the documentation and/or other materials provided with the

    12  * distribution.

    13  *

    14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    17  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

    18  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

    20  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

    21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

    22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

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

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

    25  */

    26 

    27 #ifndef WebGLContextAttributes_h

    28 #define WebGLContextAttributes_h

    29 

    30 #include "CanvasContextAttributes.h"

    31 #include "GraphicsContext3D.h"

    32 #include <wtf/PassRefPtr.h>

    33 

    34 namespace WebCore {

    35 

    36 class WebGLContextAttributes : public CanvasContextAttributes {

    37   public:

    38     virtual ~WebGLContextAttributes();

    39 

    40     // Create a new attributes object

    41     static PassRefPtr<WebGLContextAttributes> create();

    42 

    43     // Create a new attributes object initialized with preexisting attributes

    44     static PassRefPtr<WebGLContextAttributes> create(GraphicsContext3D::Attributes attributes);

    45 

    46     // Whether or not the drawing buffer has an alpha channel; default=true

    47     bool alpha() const;

    48     void setAlpha(bool alpha);

    49 

    50     // Whether or not the drawing buffer has a depth buffer; default=true

    51     bool depth() const;

    52     void setDepth(bool depth);

    53 

    54     // Whether or not the drawing buffer has a stencil buffer; default=true

    55     bool stencil() const;

    56     void setStencil(bool stencil);

    57 

    58     // Whether or not the drawing buffer is antialiased; default=true

    59     bool antialias() const;

    60     void setAntialias(bool antialias);

    61 

    62     // Whether or not to treat the values in the drawing buffer as

    63     // though their alpha channel has already been multiplied into the

    64     // color channels; default=true

    65     bool premultipliedAlpha() const;

    66     void setPremultipliedAlpha(bool premultipliedAlpha);

    67 

    68     // Fetches a copy of the attributes stored in this object in a

    69     // form that can be used to initialize a GraphicsContext3D.

    70     GraphicsContext3D::Attributes attributes() const;

    71 

    72   protected:

    73     WebGLContextAttributes();

    74     WebGLContextAttributes(GraphicsContext3D::Attributes attributes);

    75 

    76   private:

    77     GraphicsContext3D::Attributes m_attrs;

    78 };

    79 

    80 } // namespace WebCore

    81 

    82 #endif // WebGLContextAttributes_h