зеркало из https://github.com/mozilla/gecko-dev.git
110 строки
3.5 KiB
C++
110 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "WebGLChild.h"
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#include "ClientWebGLContext.h"
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#include "mozilla/StaticPrefs_webgl.h"
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#include "WebGLMethodDispatcher.h"
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namespace mozilla::dom {
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WebGLChild::WebGLChild(ClientWebGLContext& context)
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: mContext(&context),
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mDefaultCmdsShmemSize(StaticPrefs::webgl_out_of_process_shmem_size()) {}
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WebGLChild::~WebGLChild() { (void)Send__delete__(this); }
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void WebGLChild::ActorDestroy(ActorDestroyReason why) {
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mPendingCmdsShmem = {};
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}
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// -
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Maybe<Range<uint8_t>> WebGLChild::AllocPendingCmdBytes(
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const size_t size, const size_t fyiAlignmentOverhead) {
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if (!mPendingCmdsShmem.Size()) {
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size_t capacity = mDefaultCmdsShmemSize;
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if (capacity < size) {
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capacity = size;
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}
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mPendingCmdsShmem = mozilla::ipc::BigBuffer::TryAlloc(capacity);
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if (!mPendingCmdsShmem.Size()) {
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NS_WARNING("Failed to alloc shmem for AllocPendingCmdBytes.");
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return {};
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}
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mPendingCmdsPos = 0;
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mPendingCmdsAlignmentOverhead = 0;
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if (kIsDebug) {
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const auto ptr = mPendingCmdsShmem.Data();
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const auto initialOffset = AlignmentOffset(kUniversalAlignment, ptr);
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MOZ_ALWAYS_TRUE(!initialOffset);
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}
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}
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const auto range = Range<uint8_t>{mPendingCmdsShmem.AsSpan()};
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auto itr = range.begin() + mPendingCmdsPos;
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const auto offset = AlignmentOffset(kUniversalAlignment, itr.get());
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mPendingCmdsPos += offset;
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mPendingCmdsAlignmentOverhead += offset;
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const auto required = mPendingCmdsPos + size;
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if (required > range.length()) {
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FlushPendingCmds();
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return AllocPendingCmdBytes(size, fyiAlignmentOverhead);
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}
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itr = range.begin() + mPendingCmdsPos;
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const auto remaining = Range<uint8_t>{itr, range.end()};
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mPendingCmdsPos += size;
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mPendingCmdsAlignmentOverhead += fyiAlignmentOverhead;
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return Some(Range<uint8_t>{remaining.begin(), remaining.begin() + size});
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}
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void WebGLChild::FlushPendingCmds() {
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if (!mPendingCmdsShmem.Size()) return;
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const auto byteSize = mPendingCmdsPos;
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SendDispatchCommands(std::move(mPendingCmdsShmem), byteSize);
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mPendingCmdsShmem = {};
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mFlushedCmdInfo.flushes += 1;
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mFlushedCmdInfo.flushedCmdBytes += byteSize;
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mFlushedCmdInfo.overhead += mPendingCmdsAlignmentOverhead;
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if (gl::GLContext::ShouldSpew()) {
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const auto overheadRatio = float(mPendingCmdsAlignmentOverhead) /
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(byteSize - mPendingCmdsAlignmentOverhead);
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const auto totalOverheadRatio =
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float(mFlushedCmdInfo.overhead) /
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(mFlushedCmdInfo.flushedCmdBytes - mFlushedCmdInfo.overhead);
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printf_stderr(
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"[WebGLChild] Flushed %zu (%zu=%.2f%% overhead) bytes."
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" (%zu (%.2f%% overhead) over %zu flushes)\n",
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byteSize, mPendingCmdsAlignmentOverhead, 100 * overheadRatio,
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mFlushedCmdInfo.flushedCmdBytes, 100 * totalOverheadRatio,
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mFlushedCmdInfo.flushes);
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}
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}
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// -
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mozilla::ipc::IPCResult WebGLChild::RecvJsWarning(
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const std::string& text) const {
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if (!mContext) return IPC_OK();
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mContext->JsWarning(text);
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return IPC_OK();
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}
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mozilla::ipc::IPCResult WebGLChild::RecvOnContextLoss(
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const webgl::ContextLossReason reason) const {
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if (!mContext) return IPC_OK();
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mContext->OnContextLoss(reason);
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return IPC_OK();
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}
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} // namespace mozilla::dom
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