Unreviewed, rolling out r114929.
[WebKit-https.git] / Source / WebCore / platform / graphics / gpu / qt / DrawingBufferQt.cpp
1 /*
2  * Copyright (C) 2011 Andrew Wason (rectalogic@rectalogic.com)
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 namespace WebCore {
33
34 DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
35                              const IntSize& size,
36                              bool multisampleExtensionSupported,
37                              bool packedDepthStencilExtensionSupported,
38                              PreserveDrawingBuffer preserveDrawingBuffer,
39                              AlphaRequirement alpha)
40     : m_preserveDrawingBuffer(preserveDrawingBuffer)
41     , m_alpha(alpha)
42     , m_scissorEnabled(false)
43     , m_texture2DBinding(0)
44     , m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
45     , m_context(context)
46     , m_size(-1, -1)
47     , m_multisampleExtensionSupported(multisampleExtensionSupported)
48     , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
49     , m_fbo(context->createFramebuffer())
50     , m_colorBuffer(0)
51     , m_frontColorBuffer(0)
52     , m_separateFrontTexture(false)
53     , m_depthStencilBuffer(0)
54     , m_depthBuffer(0)
55     , m_stencilBuffer(0)
56     , m_multisampleFBO(0)
57     , m_multisampleColorBuffer(0)
58 {
59     ASSERT(m_fbo);
60     if (!m_fbo) {
61         clear();
62         return;
63     }
64
65     // create a texture to render into
66     m_colorBuffer = context->createTexture();
67     context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
68     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
69     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
70     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
71     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
72     context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
73
74     createSecondaryBuffers();
75     reset(size);
76 }
77
78 DrawingBuffer::~DrawingBuffer()
79 {
80     clear();
81 }
82
83 #if USE(ACCELERATED_COMPOSITING)
84 PlatformLayer* DrawingBuffer::platformLayer()
85 {
86     return 0;
87 }
88
89 void DrawingBuffer::prepareBackBuffer()
90 {
91 }
92
93 bool DrawingBuffer::requiresCopyFromBackToFrontBuffer() const
94 {
95     return false;
96 }
97
98 unsigned DrawingBuffer::frontColorBuffer() const
99 {
100     return colorBuffer();
101 }
102
103 void DrawingBuffer::paintCompositedResultsToCanvas(CanvasRenderingContext* context)
104 {
105 }
106 #endif
107
108 }
109
110 #endif