2 * Copyright (C) 2009 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, 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.
27 #include "core/html/canvas/WebGLRenderingContext.h"
29 #include "core/frame/LocalFrame.h"
30 #include "core/html/canvas/ANGLEInstancedArrays.h"
31 #include "core/html/canvas/EXTFragDepth.h"
32 #include "core/html/canvas/EXTShaderTextureLOD.h"
33 #include "core/html/canvas/EXTTextureFilterAnisotropic.h"
34 #include "core/html/canvas/OESElementIndexUint.h"
35 #include "core/html/canvas/OESStandardDerivatives.h"
36 #include "core/html/canvas/OESTextureFloat.h"
37 #include "core/html/canvas/OESTextureFloatLinear.h"
38 #include "core/html/canvas/OESTextureHalfFloat.h"
39 #include "core/html/canvas/OESTextureHalfFloatLinear.h"
40 #include "core/html/canvas/OESVertexArrayObject.h"
41 #include "core/html/canvas/WebGLCompressedTextureATC.h"
42 #include "core/html/canvas/WebGLCompressedTextureETC1.h"
43 #include "core/html/canvas/WebGLCompressedTexturePVRTC.h"
44 #include "core/html/canvas/WebGLCompressedTextureS3TC.h"
45 #include "core/html/canvas/WebGLContextAttributes.h"
46 #include "core/html/canvas/WebGLContextEvent.h"
47 #include "core/html/canvas/WebGLDebugRendererInfo.h"
48 #include "core/html/canvas/WebGLDebugShaders.h"
49 #include "core/html/canvas/WebGLDepthTexture.h"
50 #include "core/html/canvas/WebGLDrawBuffers.h"
51 #include "core/html/canvas/WebGLLoseContext.h"
52 #include "core/loader/FrameLoader.h"
53 #include "core/loader/FrameLoaderClient.h"
54 #include "core/frame/Settings.h"
55 #include "core/rendering/RenderBox.h"
56 #include "platform/CheckedInt.h"
57 #include "platform/NotImplemented.h"
58 #include "platform/graphics/gpu/DrawingBuffer.h"
59 #include "public/platform/Platform.h"
63 PassOwnPtrWillBeRawPtr<WebGLRenderingContext> WebGLRenderingContext::create(HTMLCanvasElement* canvas, WebGLContextAttributes* attrs)
65 Document& document = canvas->document();
66 LocalFrame* frame = document.frame();
68 canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Web page was not allowed to create a WebGL context."));
71 Settings* settings = frame->settings();
73 // The FrameLoaderClient might block creation of a new WebGL context despite the page settings; in
74 // particular, if WebGL contexts were lost one or more times via the GL_ARB_robustness extension.
75 if (!frame->loader().client()->allowWebGL(settings && settings->webGLEnabled())) {
76 canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Web page was not allowed to create a WebGL context."));
80 // The only situation that attrs is null is through Document::getCSSCanvasContext().
81 RefPtr<WebGLContextAttributes> defaultAttrs;
83 defaultAttrs = WebGLContextAttributes::create();
84 attrs = defaultAttrs.get();
86 blink::WebGraphicsContext3D::Attributes attributes = attrs->attributes(document.topDocument().url().string(), settings);
87 OwnPtr<blink::WebGraphicsContext3D> context = adoptPtr(blink::Platform::current()->createOffscreenGraphicsContext3D(attributes, 0));
88 if (!context || !context->makeContextCurrent()) {
89 canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Could not create a WebGL context."));
93 OwnPtr<Extensions3DUtil> extensionsUtil = Extensions3DUtil::create(context.get());
96 if (extensionsUtil->supportsExtension("GL_EXT_debug_marker"))
97 context->pushGroupMarkerEXT("WebGLRenderingContext");
99 OwnPtrWillBeRawPtr<WebGLRenderingContext> renderingContext = adoptPtrWillBeNoop(new WebGLRenderingContext(canvas, context.release(), attrs));
100 renderingContext->registerContextExtensions();
101 renderingContext->suspendIfNeeded();
103 if (!renderingContext->m_drawingBuffer) {
104 canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Could not create a WebGL context."));
108 return renderingContext.release();
111 WebGLRenderingContext::WebGLRenderingContext(HTMLCanvasElement* passedCanvas, PassOwnPtr<blink::WebGraphicsContext3D> context, WebGLContextAttributes* requestedAttributes)
112 : WebGLRenderingContextBase(passedCanvas, context, requestedAttributes)
114 ScriptWrappable::init(this);
117 WebGLRenderingContext::~WebGLRenderingContext()
122 void WebGLRenderingContext::registerContextExtensions()
124 // Register extensions.
125 static const char* const webkitPrefix[] = { "WEBKIT_", 0, };
126 static const char* const bothPrefixes[] = { "", "WEBKIT_", 0, };
128 registerExtension<ANGLEInstancedArrays>(m_angleInstancedArrays);
129 registerExtension<EXTTextureFilterAnisotropic>(m_extTextureFilterAnisotropic, ApprovedExtension, bothPrefixes);
130 registerExtension<OESElementIndexUint>(m_oesElementIndexUint);
131 registerExtension<OESStandardDerivatives>(m_oesStandardDerivatives);
132 registerExtension<OESTextureFloat>(m_oesTextureFloat);
133 registerExtension<OESTextureFloatLinear>(m_oesTextureFloatLinear);
134 registerExtension<OESTextureHalfFloat>(m_oesTextureHalfFloat);
135 registerExtension<OESTextureHalfFloatLinear>(m_oesTextureHalfFloatLinear);
136 registerExtension<OESVertexArrayObject>(m_oesVertexArrayObject);
137 registerExtension<WebGLCompressedTextureATC>(m_webglCompressedTextureATC, EnabledDraftExtension, webkitPrefix);
138 registerExtension<WebGLCompressedTexturePVRTC>(m_webglCompressedTexturePVRTC, EnabledDraftExtension, webkitPrefix);
139 registerExtension<WebGLCompressedTextureS3TC>(m_webglCompressedTextureS3TC, ApprovedExtension, bothPrefixes);
140 registerExtension<WebGLDepthTexture>(m_webglDepthTexture, ApprovedExtension, bothPrefixes);
141 registerExtension<WebGLDrawBuffers>(m_webglDrawBuffers);
142 registerExtension<WebGLLoseContext>(m_webglLoseContext, ApprovedExtension, bothPrefixes);
144 // Register draft extensions.
145 registerExtension<EXTFragDepth>(m_extFragDepth, DraftExtension);
146 registerExtension<EXTShaderTextureLOD>(m_extShaderTextureLOD, DraftExtension);
147 registerExtension<WebGLCompressedTextureETC1>(m_webglCompressedTextureETC1, DraftExtension);
149 // Register privileged extensions.
150 registerExtension<WebGLDebugRendererInfo>(m_webglDebugRendererInfo, WebGLDebugRendererInfoExtension);
151 registerExtension<WebGLDebugShaders>(m_webglDebugShaders, PrivilegedExtension);
154 } // namespace WebCore