100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/*
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* Copyright (C) 2025 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "arguments.h"
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#include <filament/Engine.h>
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#include <utils/Path.h>
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#include <getopt/getopt.h>
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#include <iostream>
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#include <string>
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namespace samples {
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std::string getBackendAPIArgumentsUsage() {
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return " --api, -a\n"
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" Specify the backend API: opengl, vulkan, metal, or webgpu\n\n";
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}
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static void printUsage(char* name) {
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std::string exec_name(utils::Path(name).getName());
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std::string usage("EXEC_NAME\n"
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"Usage:\n"
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" EXEC_NAME [options]\n"
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"Options:\n"
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" --help, -h\n"
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" Prints this message\n\n"
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"API_USAGE");
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const std::string from("EXEC_NAME");
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for (size_t pos = usage.find(from); pos != std::string::npos; pos = usage.find(from, pos)) {
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usage.replace(pos, from.length(), exec_name);
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}
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const std::string apiUsage("API_USAGE");
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for (size_t pos = usage.find(apiUsage); pos != std::string::npos;
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pos = usage.find(apiUsage, pos)) {
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usage.replace(pos, apiUsage.length(), getBackendAPIArgumentsUsage());
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}
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std::cout << usage;
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}
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filament::Engine::Backend parseArgumentsForBackend(const std::string& backend) {
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if (backend == "metal") {
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return filament::Engine::Backend::METAL;
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} else if (backend == "opengl") {
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return filament::Engine::Backend::OPENGL;
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} else if (backend == "vulkan") {
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return filament::Engine::Backend::VULKAN;
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} else if (backend == "webgpu") {
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return filament::Engine::Backend::WEBGPU;
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} else {
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std::cerr << "Unrecognized target API. Must be 'opengl'|'vulkan'|'metal'|'webgpu'."
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<< std::endl;
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exit(1);
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}
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}
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filament::Engine::Backend parseArgumentsForBackend(int argc, char* argv[]) {
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// The first colon in OPTSTR turns on silent error reporting. This is important, as the
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// arguments may also contain gtest parameters we don't know about.
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static constexpr const char* OPTSTR = "ha:";
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static const struct option OPTIONS[] = {
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{ "help", no_argument, nullptr, 'h' },
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{ "api", required_argument, nullptr, 'a' },
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{ nullptr, 0, nullptr, 0 }
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};
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int opt;
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int optionIndex = 0;
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while ((opt = getopt_long(argc, argv, OPTSTR, OPTIONS, &optionIndex)) >= 0) {
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std::string arg(optarg ? optarg : "");
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switch (opt) {
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default:
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case 'h':
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printUsage(argv[0]);
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exit(0);
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case 'a':
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return parseArgumentsForBackend(arg);
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}
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}
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// if no args were provided return DEFAULT
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return filament::Engine::Backend::DEFAULT;
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}
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} // namespace samples
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