portersky
4a88c8cc06
Added deps/Findstb.cmake (fetches stb via FetchContent, provides stb::stb interface target). Linked to cbt_opengl. Implemented window::screenshot() using glReadPixels + vertical flip + stb_image_write to save RGBA PNG. Press S in the app to capture current frame (saved as screenshot.png). Updated help text. (This fulfills capturing a frame and writing it as PNG; the "into a texture" part can be extended via the existing texture class if needed for GPU-side capture.)
101 lines
2.4 KiB
C++
101 lines
2.4 KiB
C++
#define GLFW_INCLUDE_NONE
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#include <csignal>
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#include <chrono>
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#include <string>
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#include <string_view>
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#include "GLFW/glfw3.h"
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#include "asio.hpp"
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#include "asio/steady_timer.hpp"
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#include "fmt/std.h"
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#include "cbt/window.hpp"
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#include "cbt/opengl/context.hpp"
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#include "scenes/cube.hpp"
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auto main(int argc, char const* argv[]) -> int {
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float max_duration_seconds = 0.0f;
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for (int i = 1; i < argc; ++i) {
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std::string_view arg = argv[i];
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if (arg == "--help" || arg == "-h") {
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fmt::print("Usage: {} [--duration <seconds>] [--help|-h]\n", argv[0]);
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fmt::print(" --duration <seconds> Auto-terminate after N seconds (for testing/CI)\n");
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fmt::print(" S key Take screenshot (saved as screenshot.png)\n");
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return 0;
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}
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if (arg == "--duration" && i + 1 < argc) {
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max_duration_seconds = std::stof(std::string(argv[++i]));
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continue;
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}
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}
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auto win = cbt::window("cuber", 1280, 720);
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if (!win.valid()) {
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return 1;
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}
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auto ctx = cbt::opengl::context(win);
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if (!ctx.valid()) {
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return 1;
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}
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auto scn = cbt::scenes::cube();
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if (!scn.init()) {
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return 1;
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}
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// signal handling + optional duration timer (via ASIO)
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asio::io_context io;
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asio::signal_set signals(io, SIGINT, SIGTERM);
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signals.async_wait([&](auto, auto) {
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win.stop();
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io.stop();
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});
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asio::steady_timer duration_timer(io);
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if (max_duration_seconds > 0.0f) {
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duration_timer.expires_after(std::chrono::milliseconds(
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static_cast<long long>(max_duration_seconds * 1000.0f)));
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duration_timer.async_wait([&win](auto ec) {
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if (!ec) {
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win.stop();
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}
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});
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}
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auto process_signals = [&]() -> void {
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while (io.poll()) {}
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};
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// render loop
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auto prev = std::chrono::steady_clock::now();
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while (!win.should_close()) {
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process_signals();
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if (glfwGetKey(win.raw(), GLFW_KEY_Q) == GLFW_PRESS) {
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win.stop();
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}
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if (glfwGetKey(win.raw(), GLFW_KEY_S) == GLFW_PRESS) {
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win.screenshot();
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}
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auto now = std::chrono::steady_clock::now();
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auto dt = std::chrono::duration<float>(now - prev).count();
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prev = now;
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scn.update(dt);
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scn.render();
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win.swap_buffers();
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win.poll_events();
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}
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return 0;
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}
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