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// Copyright 2021 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <filesystem>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#include "dawn/dawn_proc.h"
#include "src/dawn/node/binding/Flags.h"
#include "src/dawn/node/binding/GPU.h"
#include "tint/tint.h"
#ifdef DAWN_EMIT_COVERAGE
extern "C" {
void __llvm_profile_reset_counters(void);
void __llvm_profile_set_filename(const char*);
int __llvm_profile_write_file(void);
}
#endif // DAWN_EMIT_COVERAGE
namespace {
Napi::Value CreateGPU(const Napi::CallbackInfo& info) {
const auto& env = info.Env();
std::tuple<std::vector<std::string>> args;
auto res = wgpu::interop::FromJS(info, args);
if (res != wgpu::interop::Success) {
Napi::Error::New(env, res.error).ThrowAsJavaScriptException();
return env.Undefined();
}
wgpu::binding::Flags flags;
// Parse out the key=value flags out of the input args array
for (const auto& arg : std::get<0>(args)) {
const size_t sep_index = arg.find("=");
if (sep_index == std::string::npos) {
Napi::Error::New(env, "Flags expected argument format is <key>=<value>")
.ThrowAsJavaScriptException();
return env.Undefined();
}
flags.Set(arg.substr(0, sep_index), arg.substr(sep_index + 1));
}
// Construct a wgpu::interop::GPU interface, implemented by wgpu::bindings::GPU.
return wgpu::interop::GPU::Create<wgpu::binding::GPU>(env, std::move(flags));
}
#ifdef DAWN_EMIT_COVERAGE
struct Coverage {
Coverage() : output_path_{GetOutputPath()} {
__llvm_profile_set_filename(output_path_.string().c_str());
}
~Coverage() { std::filesystem::remove(output_path_); }
static void Begin(const Napi::CallbackInfo& info) {
auto* coverage = static_cast<Coverage*>(info.Data());
std::filesystem::remove(coverage->output_path_);
__llvm_profile_reset_counters();
}
static Napi::Value End(const Napi::CallbackInfo& info) {
__llvm_profile_write_file();
auto* coverage = static_cast<Coverage*>(info.Data());
return Napi::String::New(info.Env(), coverage->output_path_.string().c_str());
}
private:
static std::filesystem::path GetOutputPath() { return std::tmpnam(nullptr); }
std::filesystem::path output_path_;
};
#endif // DAWN_EMIT_COVERAGE
} // namespace
// Initialize() initializes the Dawn node module, registering all the WebGPU
// types into the global object, and adding the 'create' function on the exported
// object.
Napi::Object Initialize(Napi::Env env, Napi::Object exports) {
// Initialize Tint
tint::Initialize();
// Set all the Dawn procedure function pointers.
dawnProcSetProcs(&dawn::native::GetProcs());
// Register all the interop types
wgpu::interop::Initialize(env);
// Export function that creates and returns the wgpu::interop::GPU interface
exports.Set(Napi::String::New(env, "create"), Napi::Function::New<CreateGPU>(env));
#ifdef DAWN_EMIT_COVERAGE
Coverage* coverage = new Coverage();
auto coverage_provider = Napi::Object::New(env);
coverage_provider.Set("begin", Napi::Function::New(env, &Coverage::Begin, nullptr, coverage));
coverage_provider.Set("end", Napi::Function::New(env, &Coverage::End, nullptr, coverage));
coverage_provider.AddFinalizer([](const Napi::Env&, Coverage* c) { delete c; }, coverage);
exports.Set(Napi::String::New(env, "coverage"), coverage_provider);
#endif // DAWN_EMIT_COVERAGE
return exports;
}
NODE_API_MODULE(addon, Initialize)