Home | History | Annotate | Download | only in gpu 
      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 WebCore {
     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(blink::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(blink::WebGraphicsContext3D* context)
     35     : m_context(context)
     36 {
     37 }
     38 
     39 Extensions3DUtil::~Extensions3DUtil()
     40 {
     41 }
     42 
     43 bool Extensions3DUtil::initializeExtensions()
     44 {
     45     if (!m_context->makeContextCurrent()) {
     46         // Most likely the GPU process exited and the attempt to reconnect to it failed.
     47         // Need to try to restore the context again later.
     48         return false;
     49     }
     50 
     51     if (m_context->isContextLost()) {
     52         // Need to try to restore the context again later.
     53         return false;
     54     }
     55 
     56     String extensionsString = m_context->getString(GL_EXTENSIONS);
     57     splitStringHelper(extensionsString, m_enabledExtensions);
     58 
     59     String requestableExtensionsString = m_context->getRequestableExtensionsCHROMIUM();
     60     splitStringHelper(requestableExtensionsString, m_requestableExtensions);
     61 
     62     return true;
     63 }
     64 
     65 
     66 bool Extensions3DUtil::supportsExtension(const String& name)
     67 {
     68     return m_enabledExtensions.contains(name) || m_requestableExtensions.contains(name);
     69 }
     70 
     71 bool Extensions3DUtil::ensureExtensionEnabled(const String& name)
     72 {
     73     if (m_enabledExtensions.contains(name))
     74         return true;
     75 
     76     if (m_requestableExtensions.contains(name)) {
     77         m_context->requestExtensionCHROMIUM(name.ascii().data());
     78         m_enabledExtensions.clear();
     79         m_requestableExtensions.clear();
     80         initializeExtensions();
     81     }
     82     return m_enabledExtensions.contains(name);
     83 }
     84 
     85 bool Extensions3DUtil::isExtensionEnabled(const String& name)
     86 {
     87     return m_enabledExtensions.contains(name);
     88 }
     89 
     90 bool Extensions3DUtil::canUseCopyTextureCHROMIUM(GLenum destFormat, GLenum destType, GLint level)
     91 {
     92     // FIXME: restriction of (RGB || RGBA)/UNSIGNED_BYTE/(Level 0) should be lifted when
     93     // WebGraphicsContext3D::copyTextureCHROMIUM(...) are fully functional.
     94     if ((destFormat == GL_RGB || destFormat == GL_RGBA)
     95         && destType == GL_UNSIGNED_BYTE
     96         && !level)
     97         return true;
     98     return false;
     99 }
    100 
    101 } // namespace WebCore
    102