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