5154fd71568baea606f0e973cdeedf504b07dca7
[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_framebufferBinding(0)
50     , m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
51     , m_context(context)
52     , m_size(-1, -1)
53     , m_multisampleExtensionSupported(multisampleExtensionSupported)
54     , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
55     , m_fbo(context->createFramebuffer())
56     , m_colorBuffer(0)
57     , m_frontColorBuffer(0)
58     , m_separateFrontTexture(false)
59     , m_depthStencilBuffer(0)
60     , m_depthBuffer(0)
61     , m_stencilBuffer(0)
62     , m_multisampleFBO(0)
63     , m_multisampleColorBuffer(0)
64 {
65     ASSERT(m_fbo);
66     if (!m_fbo) {
67         clear();
68         return;
69     }
70         
71     // Create the WebGLLayer
72     BEGIN_BLOCK_OBJC_EXCEPTIONS
73         m_platformLayer.adoptNS([[WebGLLayer alloc] initWithGraphicsContext3D:m_context.get()]);
74 #ifndef NDEBUG
75         [m_platformLayer.get() setName:@"DrawingBuffer Layer"];
76 #endif    
77     END_BLOCK_OBJC_EXCEPTIONS
78
79     // create a texture to render into
80     m_colorBuffer = context->createTexture();
81     context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
82     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
83     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
84     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
85     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
86     context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
87     
88     createSecondaryBuffers();
89     reset(size);
90 }
91
92 DrawingBuffer::~DrawingBuffer()
93 {
94     clear();
95 }
96
97 #if USE(ACCELERATED_COMPOSITING)
98 PlatformLayer* DrawingBuffer::platformLayer()
99 {
100     return m_platformLayer.get();
101 }
102
103 void DrawingBuffer::prepareBackBuffer()
104 {
105 }
106
107 bool DrawingBuffer::requiresCopyFromBackToFrontBuffer() const
108 {
109     return false;
110 }
111
112 unsigned DrawingBuffer::frontColorBuffer() const
113 {
114     return colorBuffer();
115 }
116 #endif
117
118 }
119
120 #endif