Crafter.Graphics/tests/DebugMessengerSeverity/main.cpp

//SPDX-License-Identifier: LGPL-3.0-only
//SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®

// The debug messenger prints the loader's and layers' info messages only when
// CRAFTER_GRAPHICS_VALIDATION is set. It used to print them on every run (the
// loader alone reports its device sorting a few times over), so every
// application's output started with lines that were not its own. Warnings and
// errors still print either way.
//
// Captures what Device::Initialize writes to stdout without validation, so it
// skips when CRAFTER_GRAPHICS_VALIDATION is set. Needs a Vulkan device.

#include <cstdio>
#include <cstdlib>
#include <unistd.h>
#include "vulkan/vulkan.h"

import Crafter.Graphics;
import std;
using namespace Crafter;

int main() {
    if (std::getenv("CRAFTER_GRAPHICS_VALIDATION") != nullptr) {
        std::println("SKIP  checks a run without CRAFTER_GRAPHICS_VALIDATION");
        return 77;
    }

    // Send stdout to a file while the device comes up.
    std::FILE* capture = std::tmpfile();
    std::fflush(stdout);
    const int saved = dup(STDOUT_FILENO);
    dup2(fileno(capture), STDOUT_FILENO);
    Device::Initialize();
    std::fflush(stdout);
    dup2(saved, STDOUT_FILENO);
    close(saved);

    std::string output;
    std::rewind(capture);
    for (int c = std::fgetc(capture); c != EOF; c = std::fgetc(capture)) output.push_back(static_cast<char>(c));
    std::fclose(capture);

    const bool quiet = output.find("(info)") == std::string::npos;
    std::println("{}  Device::Initialize prints no info messages without validation", quiet ? "PASS" : "FAIL");
    if (!quiet) {
        std::println("      it printed:\n{}", output.substr(0, 400));
    }
    return quiet ? EXIT_SUCCESS : EXIT_FAILURE;
}