5eeac100af5ed89fa98f3b0e82b1ebcc95a25155
[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_framebufferBinding(0)
45     , m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
46     , m_context(context)
47     , m_size(-1, -1)
48     , m_multisampleExtensionSupported(multisampleExtensionSupported)
49     , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
50     , m_fbo(context->createFramebuffer())
51     , m_colorBuffer(0)
52     , m_frontColorBuffer(0)
53     , m_separateFrontTexture(false)
54     , m_depthStencilBuffer(0)
55     , m_depthBuffer(0)
56     , m_stencilBuffer(0)
57     , m_multisampleFBO(0)
58     , m_multisampleColorBuffer(0)
59 {
60     ASSERT(m_fbo);
61     if (!m_fbo) {
62         clear();
63         return;
64     }
65
66     // create a texture to render into
67     m_colorBuffer = context->createTexture();
68     context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
69     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
70     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
71     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
72     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
73     context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
74
75     createSecondaryBuffers();
76     reset(size);
77 }
78
79 DrawingBuffer::~DrawingBuffer()
80 {
81     clear();
82 }
83
84 #if USE(ACCELERATED_COMPOSITING)
85 PlatformLayer* DrawingBuffer::platformLayer()
86 {
87     return 0;
88 }
89
90 void DrawingBuffer::prepareBackBuffer()
91 {
92 }
93
94 bool DrawingBuffer::requiresCopyFromBackToFrontBuffer() const
95 {
96     return false;
97 }
98
99 unsigned DrawingBuffer::frontColorBuffer() const
100 {
101     return colorBuffer();
102 }
103
104 void DrawingBuffer::paintCompositedResultsToCanvas(CanvasRenderingContext* context)
105 {
106 }
107 #endif
108
109 }
110
111 #endif