Implement WEBGL_shared_resources

Source/core/html/canvas/WebGLFramebuffer.cpp

 /*
  * Copyright (C) 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 406 matching lines @@
 GC3Denum WebGLFramebuffer::getColorBufferFormat() const
 {
     if (!object())
         return 0;
     WebGLAttachment* attachment = getAttachment(GraphicsContext3D::COLOR_ATTACHMENT0);
     if (!attachment)
         return 0;
     return attachment->getFormat();
 }
 
-GC3Denum WebGLFramebuffer::checkStatus(const char** reason) const
+GC3Denum WebGLFramebuffer::checkStatus(WebGLRenderingContext* context, WebGLSharedObject::AcquireMode neededAccessMode, const char** reason) const
 {
     unsigned int count = 0;
     GC3Dsizei width = 0, height = 0;
     bool haveDepth = false;
     bool haveStencil = false;
     bool haveDepthStencil = false;
     for (AttachmentMap::const_iterator it = m_attachments.begin(); it != m_attachments.end(); ++it) {
         WebGLAttachment* attachment = it->value.get();
         if (!isAttachmentComplete(attachment, it->key, reason))
             return GraphicsContext3D::FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
         if (!attachment->isValid()) {
             *reason = "attachment is not valid";
             return GraphicsContext3D::FRAMEBUFFER_UNSUPPORTED;
         }
+        WebGLSharedObject* object = attachment->getObject();
+        if (object && !object->isAcquiredForContext(context, neededAccessMode, true, 0, reason))
+            return GraphicsContext3D::FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
         if (!attachment->getFormat()) {
             *reason = "attachment is an unsupported format";
             return GraphicsContext3D::FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
         }
         switch (it->key) {
         case GraphicsContext3D::DEPTH_ATTACHMENT:
             haveDepth = true;
             break;
         case GraphicsContext3D::STENCIL_ATTACHMENT:
             haveStencil = true;
@@ skipping 22 matching lines @@
         return GraphicsContext3D::FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
     }
     // WebGL specific: no conflicting DEPTH/STENCIL/DEPTH_STENCIL attachments.
     if ((haveDepthStencil && (haveDepth || haveStencil)) || (haveDepth && haveStencil)) {
         *reason = "conflicting DEPTH/STENCIL/DEPTH_STENCIL attachments";
         return GraphicsContext3D::FRAMEBUFFER_UNSUPPORTED;
     }
     return GraphicsContext3D::FRAMEBUFFER_COMPLETE;
 }
 
-bool WebGLFramebuffer::onAccess(GraphicsContext3D* context3d, const char** reason)
+bool WebGLFramebuffer::onAccess(WebGLRenderingContext* context, WebGLSharedObject::AcquireMode neededAccessMode, const char** reason)
 {
-    if (checkStatus(reason) != GraphicsContext3D::FRAMEBUFFER_COMPLETE)
+    if (checkStatus(context, neededAccessMode, reason) != GraphicsContext3D::FRAMEBUFFER_COMPLETE)
         return false;
     return true;
 }
 
 bool WebGLFramebuffer::hasStencilBuffer() const
 {
     WebGLAttachment* attachment = getAttachment(GraphicsContext3D::STENCIL_ATTACHMENT);
     if (!attachment)
         attachment = getAttachment(GraphicsContext3D::DEPTH_STENCIL_ATTACHMENT);
     return attachment && attachment->isValid();
@@ skipping 51 matching lines @@
     int index = static_cast<int>(drawBuffer - Extensions3D::DRAW_BUFFER0_EXT);
     ASSERT(index >= 0);
     if (index < static_cast<int>(m_drawBuffers.size()))
         return m_drawBuffers[index];
     if (drawBuffer == Extensions3D::DRAW_BUFFER0_EXT)
         return GraphicsContext3D::COLOR_ATTACHMENT0;
     return GraphicsContext3D::NONE;
 }
 
 }