1 /*
2 * Copyright (C) 2010 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32
33 #if USE(ACCELERATED_COMPOSITING)
34
35 #include "WebGLLayerChromium.h"
36
37 #include "GraphicsContext3D.h"
38 #include "LayerRendererChromium.h"
39
40 namespace WebCore {
41
create(GraphicsLayerChromium * owner)42 PassRefPtr<WebGLLayerChromium> WebGLLayerChromium::create(GraphicsLayerChromium* owner)
43 {
44 return adoptRef(new WebGLLayerChromium(owner));
45 }
46
WebGLLayerChromium(GraphicsLayerChromium * owner)47 WebGLLayerChromium::WebGLLayerChromium(GraphicsLayerChromium* owner)
48 : CanvasLayerChromium(owner)
49 , m_context(0)
50 , m_textureUpdated(false)
51 {
52 }
53
~WebGLLayerChromium()54 WebGLLayerChromium::~WebGLLayerChromium()
55 {
56 if (m_context && layerRenderer())
57 layerRenderer()->removeChildContext(m_context);
58 }
59
updateCompositorResources()60 void WebGLLayerChromium::updateCompositorResources()
61 {
62 if (!m_contentsDirty)
63 return;
64
65 GraphicsContext3D* rendererContext = layerRendererContext();
66 ASSERT(m_context);
67 if (m_textureChanged) {
68 rendererContext->bindTexture(GraphicsContext3D::TEXTURE_2D, m_textureId);
69 // Set the min-mag filters to linear and wrap modes to GL_CLAMP_TO_EDGE
70 // to get around NPOT texture limitations of GLES.
71 rendererContext->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
72 rendererContext->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
73 rendererContext->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
74 rendererContext->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
75 m_textureChanged = false;
76 }
77 // Update the contents of the texture used by the compositor.
78 if (m_contentsDirty && m_textureUpdated) {
79 // prepareTexture copies the contents of the off-screen render target into the texture
80 // used by the compositor.
81 //
82 m_context->prepareTexture();
83 m_context->markLayerComposited();
84 m_contentsDirty = false;
85 m_textureUpdated = false;
86 }
87 }
88
setTextureUpdated()89 void WebGLLayerChromium::setTextureUpdated()
90 {
91 m_textureUpdated = true;
92 }
93
setContext(const GraphicsContext3D * context)94 void WebGLLayerChromium::setContext(const GraphicsContext3D* context)
95 {
96 if (m_context != context && layerRenderer()) {
97 if (m_context)
98 layerRenderer()->removeChildContext(m_context);
99 if (context)
100 layerRenderer()->addChildContext(const_cast<GraphicsContext3D*>(context));
101 }
102
103 m_context = const_cast<GraphicsContext3D*>(context);
104
105 unsigned int textureId = m_context->platformTexture();
106 if (textureId != m_textureId) {
107 m_textureChanged = true;
108 m_textureUpdated = true;
109 }
110 m_textureId = textureId;
111 m_premultipliedAlpha = m_context->getContextAttributes().premultipliedAlpha;
112 }
113
setLayerRenderer(LayerRendererChromium * newLayerRenderer)114 void WebGLLayerChromium::setLayerRenderer(LayerRendererChromium* newLayerRenderer)
115 {
116 if (layerRenderer() != newLayerRenderer) {
117 if (m_context) {
118 if (layerRenderer())
119 layerRenderer()->removeChildContext(m_context);
120 if (newLayerRenderer)
121 newLayerRenderer->addChildContext(m_context);
122 }
123
124 LayerChromium::setLayerRenderer(newLayerRenderer);
125 }
126 }
127
128 }
129 #endif // USE(ACCELERATED_COMPOSITING)
130