Unreviewed, rolling out r114929.
[WebKit-https.git] / Source / WebCore / platform / graphics / gpu / mac / DrawingBufferMac.mm
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                              PreserveDrawingBuffer preserveDrawingBuffer,
44                              AlphaRequirement alpha)
45     : m_preserveDrawingBuffer(preserveDrawingBuffer)
46     , m_alpha(alpha)
47     , m_scissorEnabled(false)
48     , m_texture2DBinding(0)
49     , m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
50     , m_context(context)
51     , m_size(-1, -1)
52     , m_multisampleExtensionSupported(multisampleExtensionSupported)
53     , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
54     , m_fbo(context->createFramebuffer())
55     , m_colorBuffer(0)
56     , m_frontColorBuffer(0)
57     , m_separateFrontTexture(false)
58     , m_depthStencilBuffer(0)
59     , m_depthBuffer(0)
60     , m_stencilBuffer(0)
61     , m_multisampleFBO(0)
62     , m_multisampleColorBuffer(0)
63 {
64     ASSERT(m_fbo);
65     if (!m_fbo) {
66         clear();
67         return;
68     }
69         
70     // Create the WebGLLayer
71     BEGIN_BLOCK_OBJC_EXCEPTIONS
72         m_platformLayer.adoptNS([[WebGLLayer alloc] initWithGraphicsContext3D:m_context.get()]);
73 #ifndef NDEBUG
74         [m_platformLayer.get() setName:@"DrawingBuffer Layer"];
75 #endif    
76     END_BLOCK_OBJC_EXCEPTIONS
77
78     // create a texture to render into
79     m_colorBuffer = context->createTexture();
80     context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
81     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
82     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
83     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
84     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
85     context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
86     
87     createSecondaryBuffers();
88     reset(size);
89 }
90
91 DrawingBuffer::~DrawingBuffer()
92 {
93     clear();
94 }
95
96 #if USE(ACCELERATED_COMPOSITING)
97 PlatformLayer* DrawingBuffer::platformLayer()
98 {
99     return m_platformLayer.get();
100 }
101
102 void DrawingBuffer::prepareBackBuffer()
103 {
104 }
105
106 bool DrawingBuffer::requiresCopyFromBackToFrontBuffer() const
107 {
108     return false;
109 }
110
111 unsigned DrawingBuffer::frontColorBuffer() const
112 {
113     return colorBuffer();
114 }
115 #endif
116
117 }
118
119 #endif