void
WebGLContext::BufferSubData(GLenum target, WebGLsizeiptr byteOffset,
const dom::Nullable<dom::ArrayBuffer>& maybeData)
{
if (maybeData.IsNull()) {
// see http://www.khronos.org/bugzilla/show_bug.cgi?id=386
return;
}
BufferSubDataT(target, byteOffset, maybeData.Value());
}
void WebGL2Context::GetBufferSubData(GLenum target, GLintptr offset,
const dom::Nullable<dom::ArrayBuffer>& maybeData)
{
// If returnedData is null then an INVALID_VALUE error is
// generated.
if (maybeData.IsNull())
return ErrorInvalidValue("getBufferSubData: returnedData is null");
const dom::ArrayBuffer& data = maybeData.Value();
GetBufferSubDataT(target, offset, data);
}
void
WebGLContext::BufferData(GLenum target,
const dom::Nullable<dom::ArrayBuffer>& maybeData,
GLenum usage)
{
if (maybeData.IsNull()) {
// see http://www.khronos.org/bugzilla/show_bug.cgi?id=386
return ErrorInvalidValue("bufferData: null object passed");
}
BufferDataT(target, maybeData.Value(), usage);
}
void
DominatorTree::GetImmediatelyDominated(uint64_t aNodeId,
dom::Nullable<nsTArray<uint64_t>>& aOutResult,
ErrorResult& aRv)
{
MOZ_ASSERT(aOutResult.IsNull());
JS::ubi::Node::Id id(aNodeId);
Maybe<JS::ubi::Node> node = mHeapSnapshot->getNodeById(id);
if (node.isNothing())
return;
// Get all immediately dominated nodes and their retained sizes.
MallocSizeOf mallocSizeOf = getCurrentThreadDebuggerMallocSizeOf();
Maybe<JS::ubi::DominatorTree::DominatedSetRange> range = mDominatorTree.getDominatedSet(*node);
MOZ_ASSERT(range.isSome(), "The node should be known, since we got it from the heap snapshot.");
size_t length = range->length();
nsTArray<NodeAndRetainedSize> dominatedNodes(length);
for (const JS::ubi::Node& dominatedNode : *range) {
JS::ubi::Node::Size retainedSize = 0;
if (NS_WARN_IF(!mDominatorTree.getRetainedSize(dominatedNode, mallocSizeOf, retainedSize))) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
MOZ_ASSERT(retainedSize != 0,
"retainedSize should not be zero since we know the node is in the dominator tree.");
dominatedNodes.AppendElement(NodeAndRetainedSize(dominatedNode, retainedSize));
}
// Sort them by retained size.
NodeAndRetainedSize::Comparator comparator;
dominatedNodes.Sort(comparator);
// Fill the result with the nodes' ids.
JS::ubi::Node root = mDominatorTree.root();
aOutResult.SetValue(nsTArray<uint64_t>(length));
for (const NodeAndRetainedSize& entry : dominatedNodes) {
// The root dominates itself, but we don't want to expose that to JS.
if (entry.mNode == root)
continue;
aOutResult.Value().AppendElement(entry.mNode.identifier());
}
}
void
WebGL2Context::GetBufferSubData(GLenum target, GLintptr offset,
const dom::Nullable<dom::ArrayBuffer>& maybeData)
{
if (IsContextLost())
return;
// For the WebGLBuffer bound to the passed target, read
// returnedData.byteLength bytes from the buffer starting at byte
// offset offset and write them to returnedData.
// If zero is bound to target, an INVALID_OPERATION error is
// generated.
if (!ValidateBufferTarget(target, "getBufferSubData"))
return;
// If offset is less than zero, an INVALID_VALUE error is
// generated.
if (offset < 0)
return ErrorInvalidValue("getBufferSubData: negative offset");
// If returnedData is null then an INVALID_VALUE error is
// generated.
if (maybeData.IsNull())
return ErrorInvalidValue("getBufferSubData: returnedData is null");
WebGLRefPtr<WebGLBuffer>& bufferSlot = GetBufferSlotByTarget(target);
WebGLBuffer* boundBuffer = bufferSlot.get();
if (!boundBuffer)
return ErrorInvalidOperation("getBufferSubData: no buffer bound");
// If offset + returnedData.byteLength would extend beyond the end
// of the buffer an INVALID_VALUE error is generated.
const dom::ArrayBuffer& data = maybeData.Value();
data.ComputeLengthAndData();
CheckedInt<WebGLsizeiptr> neededByteLength = CheckedInt<WebGLsizeiptr>(offset) + data.Length();
if (!neededByteLength.isValid()) {
ErrorInvalidValue("getBufferSubData: Integer overflow computing the needed"
" byte length.");
return;
}
if (neededByteLength.value() > boundBuffer->ByteLength()) {
ErrorInvalidValue("getBufferSubData: Not enough data. Operation requires"
" %d bytes, but buffer only has %d bytes.",
neededByteLength.value(), boundBuffer->ByteLength());
return;
}
// If target is TRANSFORM_FEEDBACK_BUFFER, and any transform
// feedback object is currently active, an INVALID_OPERATION error
// is generated.
WebGLTransformFeedback* currentTF = mBoundTransformFeedback;
if (target == LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER && currentTF) {
if (currentTF->mIsActive)
return ErrorInvalidOperation("getBufferSubData: Currently bound transform"
" feedback is active");
// https://github.com/NVIDIA/WebGL/commit/63aff5e58c1d79825a596f0f4aa46174b9a5f72c
// Performing reads and writes on a buffer that is currently
// bound for transform feedback causes undefined results in
// GLES3.0 and OpenGL 4.5. In practice results of reads and
// writes might be consistent as long as transform feedback
// objects are not active, but neither GLES3.0 nor OpenGL 4.5
// spec guarantees this - just being bound for transform
// feedback is sufficient to cause undefined results.
BindTransformFeedback(LOCAL_GL_TRANSFORM_FEEDBACK, nullptr);
}
/* If the buffer is written and read sequentially by other
* operations and getBufferSubData, it is the responsibility of
* the WebGL API to ensure that data are access
* consistently. This applies even if the buffer is currently
* bound to a transform feedback binding point.
*/
void* ptr = gl->fMapBufferRange(target, offset, data.Length(), LOCAL_GL_MAP_READ_BIT);
memcpy(data.Data(), ptr, data.Length());
gl->fUnmapBuffer(target);
if (target == LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER && currentTF) {
BindTransformFeedback(LOCAL_GL_TRANSFORM_FEEDBACK, currentTF);
}
}