1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/*
* Copyright (c) 2010, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DrawingBuffer_h
#define DrawingBuffer_h
#include "GraphicsContext3D.h"
#include "GraphicsTypes3D.h"
#include "IntSize.h"
#include "PlatformLayer.h"
#include <wtf/Noncopyable.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#if PLATFORM(MAC)
#include <wtf/RetainPtr.h>
#endif
namespace WebCore {
class GraphicsContext3D;
// Manages a rendering target (framebuffer + attachment) for a canvas. Can publish its rendering
// results to a PlatformLayer for compositing.
class DrawingBuffer : public RefCounted<DrawingBuffer> {
public:
enum PreserveDrawingBuffer {
Preserve,
Discard
};
enum AlphaRequirement {
Alpha,
Opaque
};
static PassRefPtr<DrawingBuffer> create(GraphicsContext3D*, const IntSize&, PreserveDrawingBuffer, AlphaRequirement);
friend class GraphicsContext3D;
~DrawingBuffer();
// Issues a glClear() on all framebuffers associated with this DrawingBuffer. The caller is responsible for
// making the context current and setting the clear values and masks. Modifies the framebuffer binding.
void clearFramebuffers(GC3Dbitfield clearMask);
// Returns true if the buffer was successfully resized.
bool reset(const IntSize&);
void bind();
IntSize size() const { return m_size; }
Platform3DObject colorBuffer() const { return m_colorBuffer; }
// Clear all resources from this object, as well as context. Called when context is destroyed
// to prevent invalid accesses to the resources.
void clear();
// Create the depth/stencil and multisample buffers, if needed.
void createSecondaryBuffers();
void resizeDepthStencil(int sampleCount);
// Copies the multisample color buffer to the normal color buffer and leaves m_fbo bound
void commit(long x = 0, long y = 0, long width = -1, long height = -1);
// commit should copy the full multisample buffer, and not respect the
// current scissor bounds. Track the state of the scissor test so that it
// can be disabled during calls to commit.
void setScissorEnabled(bool scissorEnabled) { m_scissorEnabled = scissorEnabled; }
// The DrawingBuffer needs to track the texture bound to texture unit 0.
// The bound texture is tracked to avoid costly queries during rendering.
void setTexture2DBinding(Platform3DObject texture) { m_texture2DBinding = texture; }
// The DrawingBuffer needs to track the currently bound framebuffer so it
// restore the binding when needed.
void setFramebufferBinding(Platform3DObject fbo) { m_framebufferBinding = fbo; }
// Bind to the m_framebufferBinding if it's not 0.
void restoreFramebufferBinding();
// Track the currently active texture unit. Texture unit 0 is used as host for a scratch
// texture.
void setActiveTextureUnit(GC3Dint textureUnit) { m_activeTextureUnit = textureUnit; }
bool multisample() const;
Platform3DObject framebuffer() const;
// Immediately releases ownership of all resources. Call upon loss of the
// graphics context to prevent freeing invalid resources.
void discardResources();
void markContentsChanged() { m_contentsChanged = true; }
#if USE(ACCELERATED_COMPOSITING)
PlatformLayer* platformLayer();
unsigned frontColorBuffer() const;
void paintCompositedResultsToCanvas(ImageBuffer*);
#endif
GraphicsContext3D* graphicsContext3D() const { return m_context.get(); }
private:
DrawingBuffer(GraphicsContext3D*, const IntSize&, bool multisampleExtensionSupported,
bool packedDepthStencilExtensionSupported, PreserveDrawingBuffer, AlphaRequirement);
void initialize(const IntSize&);
bool checkBufferIntegrity();
PreserveDrawingBuffer m_preserveDrawingBuffer;
AlphaRequirement m_alpha;
bool m_scissorEnabled;
Platform3DObject m_texture2DBinding;
Platform3DObject m_framebufferBinding;
GC3Denum m_activeTextureUnit;
RefPtr<GraphicsContext3D> m_context;
IntSize m_size;
bool m_multisampleExtensionSupported;
bool m_packedDepthStencilExtensionSupported;
Platform3DObject m_fbo;
Platform3DObject m_colorBuffer;
Platform3DObject m_frontColorBuffer;
bool m_separateFrontTexture;
// This is used when we have OES_packed_depth_stencil.
Platform3DObject m_depthStencilBuffer;
// These are used when we don't.
Platform3DObject m_depthBuffer;
Platform3DObject m_stencilBuffer;
// For multisampling
Platform3DObject m_multisampleFBO;
Platform3DObject m_multisampleColorBuffer;
// True if our contents have been modified since the last presentation of this buffer.
bool m_contentsChanged;
#if PLATFORM(MAC)
RetainPtr<WebGLLayer> m_platformLayer;
#endif
};
} // namespace WebCore
#endif // DrawingBuffer_h
|
