1. rcrnstn/glbackend
  2. include
  3. glbackend_wxwidgets.hpp
Browse code

WIP: Add GLBackendWxWidgets

Robert Cranston authored on 20/10/2021 21:11:33
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include/glbackend_wxwidgets.hpp
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+/// Guards
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+
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+#ifdef  GLBACKEND_WXWIDGETS
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+#ifndef GLBACKEND_WXWIDGETS_HPP_
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+#define GLBACKEND_WXWIDGETS_HPP_
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+
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+
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+/// Includes
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+
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+#include <array>
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+#include <string>
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+
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+#include <glbackend.hpp>
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+
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+// #include <wx/wx.h>
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+#include <wx/evtloop.h>
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+#include <wx/glcanvas.h>
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+#include <wx/app.h>
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+#include <wx/gdicmn.h>
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+#include <wx/gtk/app.h>
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+#include <wx/gtk/evtloop.h>
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+#include <wx/longlong.h>
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+#include <wx/time.h>
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+#include <wx/unix/glx11.h>
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+#include "wx/cursor.h"
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+class wxAppConsole;
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+class wxFrame;
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+
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+
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+/// Class definition
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+
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+class GLBackendWxWidgets final : public GLBackend
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+{
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+
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+public:
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+
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+    //// Special member functions
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+
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+    explicit GLBackendWxWidgets(
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+        std::string const & title,
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+        std::array<int, 2>  size        = {0, 0},
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+        std::array<int, 2>  version     = {0, 0},
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+        int                 samples     = 0,
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+        bool                fullscreen  = false,
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+        bool                transparent = false
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+    );
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+    ~GLBackendWxWidgets();
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+    GLBackendWxWidgets(GLBackendWxWidgets &&) noexcept;
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+    GLBackendWxWidgets(GLBackendWxWidgets const &) = delete;
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+    GLBackendWxWidgets & operator=(GLBackendWxWidgets &&) = delete;
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+    GLBackendWxWidgets & operator=(GLBackendWxWidgets const &) = delete;
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+
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+    //// Context
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+
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+    void current() override;
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+
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+    //// Render loop
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+
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+    void swap() override;
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+
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+    void events() override;
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+
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+    bool running() const override;
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+    bool running(bool running) override;
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+
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+    float time() const override;
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+    float time(float time) override;
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+
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+    //// Input and output
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+
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+    void lock(bool lock) override;
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+
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+    bool key   (std::string const & key)    const override;
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+    bool button(int                 button) const override;
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+
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+    //// Debug
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+
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+    std::string debug_info() const override;
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+
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+protected:
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+
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+    //// Special member functions
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+
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+    void destroy_();
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+
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+protected:
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+
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+    //// Context
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+
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+    wxAppConsole * app_;
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+    wxFrame      * frame_;
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+    wxGLCanvas   * canvas_;
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+    wxGLContext  * context_;
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+
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+    //// Render loop
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+
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+    wxGUIEventLoop event_loop_;
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+    float          time_;
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+
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+    //// Input and output
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+
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+    bool locked_;
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+
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+};
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+
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+
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+/// Inline definitions
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+
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+inline void GLBackendWxWidgets::current()
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+{
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+    context_->SetCurrent(*canvas_);
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+}
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+
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+inline void GLBackendWxWidgets::events()
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+{
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+    // wxWidgets/include/wx/evtloop.h
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+    // wxWidgets/src/common/evtloopcmn.cpp
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+    wxEventLoopActivator event_loop_activator(&event_loop_);
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+    while (event_loop_.Pending())
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+        event_loop_.Dispatch();
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+    event_loop_.ProcessIdle();
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+    if (wxTheApp)
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+        wxTheApp->ProcessPendingEvents();
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+}
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+
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+inline void GLBackendWxWidgets::swap()
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+{
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+    canvas_->SwapBuffers();
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+}
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+
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+inline bool GLBackendWxWidgets::running() const
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+{
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+    return canvas_->IsShown();
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+}
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+
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+inline bool GLBackendWxWidgets::running(bool running)
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+{
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+    canvas_->Show(running);
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+    return running;
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+}
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+
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+inline float GLBackendWxWidgets::time() const
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+{
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+    return (float)(wxGetUTCTimeUSec().ToDouble() / 1000000.0) - time_;
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+}
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+
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+inline float GLBackendWxWidgets::time(float time)
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+{
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+    time_ = (float)(wxGetUTCTimeUSec().ToDouble() / 1000000.0) - time;
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+    return time;
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+}
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+
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+inline void GLBackendWxWidgets::lock(bool lock)
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+{
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+    canvas_->SetCursor(lock ? wxCursor(wxCURSOR_BLANK) : wxNullCursor);
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+    if (lock && !locked_)
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+        canvas_->CaptureMouse();
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+    else if (!lock && locked_)
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+        canvas_->ReleaseMouse();
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+    locked_ = lock;
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+    // TODO(rcrnstn): wxWidgets `WarpPointer` needed?
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+    // canvas_->WarpPointer(
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+    //     size_[0] / 2,
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+    //     size_[1] / 2
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+    // );
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+}
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+
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+inline bool GLBackendWxWidgets::key(std::string const & key) const
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+{
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+    (void)key;
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+    return false;
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+}
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+inline bool GLBackendWxWidgets::button(int button) const
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+{
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+    (void)button;
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+    return false;
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+}
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+
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+
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+/// Guards
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+
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+#endif
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+#endif