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// Copyright (c) 2010-2026, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-443271.
//
// This file is part of the GLVis visualization tool and library. For more
// information and source code availability see https://glvis.org.
//
// GLVis is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.
#ifndef GLVIS_SDL_HPP
#define GLVIS_SDL_HPP
#include <string>
#include <mutex>
#include <condition_variable>
#include <deque>
#include "../glwindow.hpp"
#include "sdl_helper.hpp"
typedef void (*TouchDelegate)(SDL_MultiGestureEvent&);
typedef void (*WindowDelegate)(int, int);
class SdlMainThread;
SdlMainThread& GetSdlMainThread();
class SdlWindow : public GLWindow
{
private:
friend class SdlMainThread;
struct Handle
{
SDL_Window * hwnd{nullptr};
SDL_GLContext gl_ctx{};
Handle() = default;
Handle(const std::string& title, int x, int y, int w, int h,
Uint32 wndflags);
~Handle();
Handle(Handle&& other)
: hwnd(other.hwnd), gl_ctx(other.gl_ctx)
{
other.hwnd = nullptr;
other.gl_ctx = 0;
}
Handle& operator= (Handle&& other)
{
std::swap(hwnd, other.hwnd);
std::swap(gl_ctx, other.gl_ctx);
return *this;
}
bool isInitialized() const
{
return (hwnd != nullptr && gl_ctx != 0);
}
};
int window_id = -1;
Handle handle;
static const int high_dpi_threshold = 144;
// The display is high-dpi when:
// - SDL's "screen coordinates" sizes are different from the pixel sizes, or
// - either the horizontal or the vertical dpi, as returned by getDpi(),
// is >= high_dpi_threshold, defined above.
bool high_dpi = false;
// Ratio of SDL's "screen coordinates" to GLVis' "screen coordinates":
// - set to 1 on non-high-dpi displays,
// - set to 1 on high-dpi displays where SDL's "screen coordinates" sizes are
// different from the pixels sizes (e.g. Mac retina displays),
// - set to 2 on other high-dpi displays, so that GLVis can always work with
// scaled "screen coordinates" on all high-dpi displays.
float pixel_scale_x = 1.0f, pixel_scale_y = 1.0f;
bool running;
WindowDelegate onReshape{nullptr};
TouchDelegate onTouchPinch{nullptr};
TouchDelegate onTouchRotate{nullptr};
bool update_before_expose{false};
// bool requiresExpose;
bool takeScreenshot{false};
std::string screenshot_file;
bool screenshot_convert;
bool lastKeyDownProcessed;
SDL_Keymod lastKeyDownMods;
char lastKeyDownChar;
// internal event handlers
void windowEvent(SDL_WindowEvent& ew);
void motionEvent(SDL_MouseMotionEvent& em);
void mouseEventDown(SDL_MouseButtonEvent& eb);
void mouseEventUp(SDL_MouseButtonEvent& eb);
void keyDownEvent(SDL_Keysym& ks);
void textInputEvent(const SDL_TextInputEvent &e);
void multiGestureEvent(SDL_MultiGestureEvent & e);
bool is_multithreaded{true};
bool call_idle_func{false};
// Hand off events to the SdlWindow. Intended to be called by the main SDL
// thread in MainThread::MainLoop().
void queueEvents(std::vector<SDL_Event> events)
{
{
std::lock_guard<std::mutex> evt_guard{event_mutex};
waiting_events.insert(waiting_events.end(), events.begin(), events.end());
}
if (is_multithreaded)
{
events_available.notify_all();
}
}
std::condition_variable events_available;
std::mutex event_mutex;
// The window-specific events collected by the main event thread.
std::deque<SDL_Event> waiting_events;
public:
SdlWindow();
~SdlWindow();
// Initializes SDL2 and starts the main loop. Should be called from the main
// thread only.
static void StartSDL(bool server_mode);
/** @brief Creates a new OpenGL window. Returns false if SDL or OpenGL
initialization fails. */
bool createWindow(const char * title, int x, int y, int w, int h,
bool legacyGlOnly) override;
/// Runs the window loop.
void mainLoop() override;
void mainIter() override;
// Called by worker threads in GLVisCommand::signal()
void signalLoop() override;
void setOnReshape(WindowDelegate func) { onReshape = func; }
void setTouchPinchCallback(TouchDelegate cb) { onTouchPinch = cb; }
void setTouchRotateCallback(TouchDelegate cb) { onTouchRotate = cb; }
void clearEvents() override
{
GLWindow::clearEvents();
onReshape = nullptr;
}
void getWindowSize(int& w, int& h) const override;
void getGLDrawSize(int& w, int& h) const override;
void getDpi(int& wdpi, int& hdpi) const override;
/// This property is set by createWindow().
bool isHighDpi() const override { return high_dpi; }
void setWindowTitle(const std::string& title) override;
void setWindowTitle(const char* title) override;
void setWindowSize(int w, int h) override;
void setWindowPos(int x, int y) override;
void signalKeyDown(SDL_Keycode k, SDL_Keymod m = KMOD_NONE) override;
void signalQuit() override { running = false; }
/// Queues a screenshot to be taken.
void screenshot(std::string filename, bool convert = false) override
{
takeScreenshot = true;
screenshot_file = filename;
screenshot_convert = convert;
// Queue up an expose, so Screenshot() can pull image from the back
// buffer
signalExpose();
}
void swapBuffer();
operator bool() { return handle.isInitialized(); }
bool isWindowInitialized() const override { return handle.isInitialized(); }
/// Returns true if the OpenGL context was successfully initialized.
bool isGlInitialized() const override;
};
#endif
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