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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "config.h"
      6 #include "platform/graphics/gpu/Extensions3DUtil.h"
      7 
      8 #include "public/platform/WebGraphicsContext3D.h"
      9 #include "wtf/text/CString.h"
     10 #include "wtf/text/StringHash.h"
     11 
     12 namespace blink {
     13 
     14 namespace {
     15 
     16 void splitStringHelper(const String& str, HashSet<String>& set)
     17 {
     18     Vector<String> substrings;
     19     str.split(' ', substrings);
     20     for (size_t i = 0; i < substrings.size(); ++i)
     21         set.add(substrings[i]);
     22 }
     23 
     24 } // anonymous namespace
     25 
     26 PassOwnPtr<Extensions3DUtil> Extensions3DUtil::create(WebGraphicsContext3D* context)
     27 {
     28     OwnPtr<Extensions3DUtil> out = adoptPtr(new Extensions3DUtil(context));
     29     if (!out->initializeExtensions())
     30         return nullptr;
     31     return out.release();
     32 }
     33 
     34 Extensions3DUtil::Extensions3DUtil(WebGraphicsContext3D* context)
     35     : m_context(context)
     36 {
     37 }
     38 
     39 Extensions3DUtil::~Extensions3DUtil()
     40 {
     41 }
     42 
     43 bool Extensions3DUtil::initializeExtensions()
     44 {
     45     if (m_context->isContextLost()) {
     46         // Need to try to restore the context again later.
     47         return false;
     48     }
     49 
     50     String extensionsString = m_context->getString(GL_EXTENSIONS);
     51     splitStringHelper(extensionsString, m_enabledExtensions);
     52 
     53     String requestableExtensionsString = m_context->getRequestableExtensionsCHROMIUM();
     54     splitStringHelper(requestableExtensionsString, m_requestableExtensions);
     55 
     56     return true;
     57 }
     58 
     59 
     60 bool Extensions3DUtil::supportsExtension(const String& name)
     61 {
     62     return m_enabledExtensions.contains(name) || m_requestableExtensions.contains(name);
     63 }
     64 
     65 bool Extensions3DUtil::ensureExtensionEnabled(const String& name)
     66 {
     67     if (m_enabledExtensions.contains(name))
     68         return true;
     69 
     70     if (m_requestableExtensions.contains(name)) {
     71         m_context->requestExtensionCHROMIUM(name.ascii().data());
     72         m_enabledExtensions.clear();
     73         m_requestableExtensions.clear();
     74         initializeExtensions();
     75     }
     76     return m_enabledExtensions.contains(name);
     77 }
     78 
     79 bool Extensions3DUtil::isExtensionEnabled(const String& name)
     80 {
     81     return m_enabledExtensions.contains(name);
     82 }
     83 
     84 bool Extensions3DUtil::canUseCopyTextureCHROMIUM(GLenum destFormat, GLenum destType, GLint level)
     85 {
     86     // FIXME: restriction of (RGB || RGBA)/UNSIGNED_BYTE/(Level 0) should be lifted when
     87     // WebGraphicsContext3D::copyTextureCHROMIUM(...) are fully functional.
     88     if ((destFormat == GL_RGB || destFormat == GL_RGBA)
     89         && destType == GL_UNSIGNED_BYTE
     90         && !level)
     91         return true;
     92     return false;
     93 }
     94 
     95 } // namespace blink
     96