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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "modules/webgl/WebGLGetBufferSubDataAsync.h"
#include "core/dom/DOMException.h"
#include "gpu/GLES2/gl2extchromium.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "modules/webgl/WebGL2RenderingContextBase.h"
namespace blink {
WebGLGetBufferSubDataAsync::WebGLGetBufferSubDataAsync(
WebGLRenderingContextBase* context)
: WebGLExtension(context) {}
WebGLExtensionName WebGLGetBufferSubDataAsync::name() const {
return WebGLGetBufferSubDataAsyncName;
}
WebGLGetBufferSubDataAsync* WebGLGetBufferSubDataAsync::create(
WebGLRenderingContextBase* context) {
return new WebGLGetBufferSubDataAsync(context);
}
bool WebGLGetBufferSubDataAsync::supported(WebGLRenderingContextBase* context) {
return true;
}
const char* WebGLGetBufferSubDataAsync::extensionName() {
return "WEBGL_get_buffer_sub_data_async";
}
ScriptPromise WebGLGetBufferSubDataAsync::getBufferSubDataAsync(
ScriptState* scriptState,
GLenum target,
GLintptr srcByteOffset,
DOMArrayBufferView* dstData,
GLuint dstOffset,
GLuint length) {
ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
ScriptPromise promise = resolver->promise();
WebGLExtensionScopedContext scoped(this);
if (scoped.isLost()) {
DOMException* exception =
DOMException::create(InvalidStateError, "context lost");
resolver->reject(exception);
return promise;
}
WebGL2RenderingContextBase* context = nullptr;
{
WebGLRenderingContextBase* contextBase = scoped.context();
DCHECK_GE(contextBase->version(), 2u);
context = static_cast<WebGL2RenderingContextBase*>(contextBase);
}
WebGLBuffer* sourceBuffer = nullptr;
void* destinationDataPtr = nullptr;
long long destinationByteLength = 0;
const char* message = context->validateGetBufferSubData(
__FUNCTION__, target, srcByteOffset, dstData, dstOffset, length,
&sourceBuffer, &destinationDataPtr, &destinationByteLength);
if (message) {
// If there was a GL error, it was already synthesized in
// validateGetBufferSubData, so it's not done here.
DOMException* exception = DOMException::create(InvalidStateError, message);
resolver->reject(exception);
return promise;
}
message = context->validateGetBufferSubDataBounds(
__FUNCTION__, sourceBuffer, srcByteOffset, destinationByteLength);
if (message) {
// If there was a GL error, it was already synthesized in
// validateGetBufferSubDataBounds, so it's not done here.
DOMException* exception = DOMException::create(InvalidStateError, message);
resolver->reject(exception);
return promise;
}
// If the length of the copy is zero, this is a no-op.
if (!destinationByteLength) {
resolver->resolve(dstData);
return promise;
}
GLuint queryID;
context->contextGL()->GenQueriesEXT(1, &queryID);
context->contextGL()->BeginQueryEXT(GL_COMMANDS_ISSUED_CHROMIUM, queryID);
void* mappedData = context->contextGL()->GetBufferSubDataAsyncCHROMIUM(
target, srcByteOffset, destinationByteLength);
context->contextGL()->EndQueryEXT(GL_COMMANDS_ISSUED_CHROMIUM);
if (!mappedData) {
DOMException* exception =
DOMException::create(InvalidStateError, "Out of memory");
resolver->reject(exception);
return promise;
}
auto callbackObject = new WebGLGetBufferSubDataAsyncCallback(
context, resolver, mappedData, queryID, dstData, destinationDataPtr,
destinationByteLength);
context->registerGetBufferSubDataAsyncCallback(callbackObject);
auto callback = WTF::bind(&WebGLGetBufferSubDataAsyncCallback::resolve,
wrapPersistent(callbackObject));
context->drawingBuffer()->contextProvider()->signalQuery(
queryID, convertToBaseCallback(std::move(callback)));
return promise;
}
WebGLGetBufferSubDataAsyncCallback::WebGLGetBufferSubDataAsyncCallback(
WebGL2RenderingContextBase* context,
ScriptPromiseResolver* promiseResolver,
void* shmReadbackResultData,
GLuint commandsIssuedQueryID,
DOMArrayBufferView* destinationArrayBufferView,
void* destinationDataPtr,
long long destinationByteLength)
: m_context(context),
m_promiseResolver(promiseResolver),
m_shmReadbackResultData(shmReadbackResultData),
m_commandsIssuedQueryID(commandsIssuedQueryID),
m_destinationArrayBufferView(destinationArrayBufferView),
m_destinationDataPtr(destinationDataPtr),
m_destinationByteLength(destinationByteLength) {
DCHECK(shmReadbackResultData);
DCHECK(destinationDataPtr);
}
void WebGLGetBufferSubDataAsyncCallback::destroy() {
DCHECK(m_shmReadbackResultData);
m_context->contextGL()->FreeSharedMemory(m_shmReadbackResultData);
m_shmReadbackResultData = nullptr;
DOMException* exception =
DOMException::create(InvalidStateError, "Context lost or destroyed");
m_promiseResolver->reject(exception);
}
void WebGLGetBufferSubDataAsyncCallback::resolve() {
if (!m_context || !m_shmReadbackResultData) {
DOMException* exception =
DOMException::create(InvalidStateError, "Context lost or destroyed");
m_promiseResolver->reject(exception);
return;
}
if (m_destinationArrayBufferView->buffer()->isNeutered()) {
DOMException* exception = DOMException::create(
InvalidStateError, "ArrayBufferView became invalid asynchronously");
m_promiseResolver->reject(exception);
return;
}
memcpy(m_destinationDataPtr, m_shmReadbackResultData,
m_destinationByteLength);
// TODO(kainino): What would happen if the DOM was suspended when the
// promise became resolved? Could another JS task happen between the memcpy
// and the promise resolution task, which would see the wrong data?
m_promiseResolver->resolve(m_destinationArrayBufferView);
m_context->contextGL()->DeleteQueriesEXT(1, &m_commandsIssuedQueryID);
this->destroy();
m_context->unregisterGetBufferSubDataAsyncCallback(this);
}
DEFINE_TRACE(WebGLGetBufferSubDataAsyncCallback) {
visitor->trace(m_context);
visitor->trace(m_promiseResolver);
visitor->trace(m_destinationArrayBufferView);
}
} // namespace blink
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