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      1 /*
      2  * Copyright (C) 2010 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 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 #include "config.h"
     27 
     28 #if ENABLE(ACCELERATED_2D_CANVAS) || ENABLE(WEBGL)
     29 
     30 #include "DrawingBuffer.h"
     31 
     32 #include "Extensions3D.h"
     33 #include "WebGLLayer.h"
     34 
     35 #import "BlockExceptions.h"
     36 
     37 namespace WebCore {
     38 
     39 DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
     40                              const IntSize& size,
     41                              bool multisampleExtensionSupported,
     42                              bool packedDepthStencilExtensionSupported)
     43     : m_context(context)
     44     , m_size(-1, -1)
     45     , m_multisampleExtensionSupported(multisampleExtensionSupported)
     46     , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
     47     , m_fbo(context->createFramebuffer())
     48     , m_colorBuffer(0)
     49     , m_depthStencilBuffer(0)
     50     , m_depthBuffer(0)
     51     , m_stencilBuffer(0)
     52     , m_multisampleFBO(0)
     53     , m_multisampleColorBuffer(0)
     54 {
     55     ASSERT(m_fbo);
     56     if (!m_fbo) {
     57         clear();
     58         return;
     59     }
     60 
     61     // Create the WebGLLayer
     62     BEGIN_BLOCK_OBJC_EXCEPTIONS
     63         m_platformLayer.adoptNS([[WebGLLayer alloc] initWithGraphicsContext3D:m_context.get()]);
     64 #ifndef NDEBUG
     65         [m_platformLayer.get() setName:@"DrawingBuffer Layer"];
     66 #endif
     67     END_BLOCK_OBJC_EXCEPTIONS
     68 
     69     // create a texture to render into
     70     m_colorBuffer = context->createTexture();
     71     context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
     72     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
     73     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
     74     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
     75     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
     76     context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
     77 
     78     // Create the FBO
     79     m_fbo = context->createFramebuffer();
     80     ASSERT(m_fbo);
     81     if (!m_fbo) {
     82         clear();
     83         return;
     84     }
     85 
     86     createSecondaryBuffers();
     87     reset(size);
     88 }
     89 
     90 DrawingBuffer::~DrawingBuffer()
     91 {
     92     clear();
     93 }
     94 
     95 void DrawingBuffer::didReset()
     96 {
     97 }
     98 
     99 PlatformLayer* DrawingBuffer::platformLayer()
    100 {
    101     return m_platformLayer.get();
    102 }
    103 
    104 Platform3DObject DrawingBuffer::platformColorBuffer() const
    105 {
    106     return m_colorBuffer;
    107 }
    108 
    109 }
    110 
    111 #endif
    112