1. rcrnstn/glbackend
  2. src
  3. glbackend_wxwidgets.cpp
Browse code

WIP: Add GLBackendWxWidgets

Robert Cranston authored on 20/10/2021 21:11:33
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src/glbackend_wxwidgets.cpp
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+/// Guards
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+
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+
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+#ifdef GLBACKEND_WXWIDGETS
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+
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+
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+/// Includes
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+
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+
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+#include <glbackend_wxwidgets.hpp>
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+
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+#include <array>
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+#include <sstream>
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+#include <string>
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+#include <utility>
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+#include <vector>
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+
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+#include <glbase.hpp>
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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/app.h>
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+#include <wx/defs.h>
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+#include <wx/display.h>
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+#include <wx/event.h>
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+#include <wx/frame.h>
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+#include <wx/glcanvas.h>
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+#include <wx/init.h>
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+#include <wx/platinfo.h>
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+#include <wx/string.h>
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+#include <wx/tbarbase.h>
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+#include <wx/toplevel.h>
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+#include <wx/utils.h>
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+#include <wx/version.h>
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+#include <wx/versioninfo.h>
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+#include <wx/vidmode.h>
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+#include <wx/window.h>
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+#include <wx/windowid.h>
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+
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+// NOLINTNEXTLINE
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+#define STR_EXCEPTION GLBase::Exception
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+#include <str.hpp>
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+
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+
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+
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+namespace
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+{
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+class Canvas : public wxGLCanvas
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+{
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+
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+public:
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+
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+    Canvas(
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+        wxWindow      * parent,
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+        wxWindowID      id,
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+        int     const * attribs,
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+        wxPoint const & pos,
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+        wxSize  const & size
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+    )
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+    :
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+        wxGLCanvas(parent, id, attribs, pos, size)
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+    {}
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+
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+protected:
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+
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+    // TODO(rcrnstn): Implement wxWidgets event handling.
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+    // void paint_(wxPaintEvent& event);
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+    // void size_(wxSizeEvent& event);
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+    // void char_(wxKeyEvent& event);
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+    // void mouse_event_(wxMouseEvent& event);
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+    // void exit_(wxCommandEvent& event);
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+    wxDECLARE_EVENT_TABLE(); // NOLINT
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+
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+};
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+}
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+
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+
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+// TODO(rcrnstn): Implement wxWidgets event handling.
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+#pragma GCC diagnostic push
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+#pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
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+wxBEGIN_EVENT_TABLE(Canvas, wxGLCanvas) // NOLINT
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+//     EVT_PAINT(Canvas::paint_)
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+wxEND_EVENT_TABLE() // NOLINT
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+#pragma GCC diagnostic pop
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+
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+
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+GLBackendWxWidgets::GLBackendWxWidgets(
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+    std::string const & title,
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+    std::array<int, 2>  size,
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+    std::array<int, 2>  version,
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+    int                 samples,
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+    bool                fullscreen,
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+    bool                transparent
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+)
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+:
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+    GLBackend(),
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+    app_       {nullptr},
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+    frame_     {nullptr},
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+    canvas_    {nullptr},
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+    context_   {nullptr},
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+    event_loop_{},
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+    time_      {0.0F},
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+    locked_    {false}
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+{
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+    // Backend init
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+    if (!wxApp::GetInstance())
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+    {
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+        wxDISABLE_DEBUG_SUPPORT();
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+
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+        wxApp::SetInitializerFunction([]()
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+        {
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+            // cppcheck-suppress cstyleCast
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+            return (wxAppConsole *)new wxApp;
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+        });
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+
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+        auto argc = int{0};
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+        auto argv = std::array<char *, 1>{{nullptr}};
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+        if (!wxEntryStart(argc, &argv[0]))
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+            STR_THROW("Failed to initialize wxWidgets.");
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+
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+        app_ = wxApp::GetInstance();
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+        app_->OnInit();
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+    }
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+
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+    // Window options
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+    auto frame_style = long{0}; // NOLINT
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+    frame_style |= wxDEFAULT_FRAME_STYLE; // NOLINT
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+    frame_style &= ~(wxRESIZE_BORDER | wxMAXIMIZE_BOX); // NOLINT
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+    frame_style |= wxWANTS_CHARS; // NOLINT
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+    if (transparent)
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+    {
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+        frame_style &= ~wxDEFAULT_FRAME_STYLE; // NOLINT
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+        frame_style |= wxSTAY_ON_TOP; // NOLINT
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+    }
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+    if (size[0] == 0 || size[1] == 0)
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+    {
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+        auto const mode = wxDisplay(0).GetCurrentMode();
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+        size[0] = mode.GetWidth();
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+        size[1] = mode.GetHeight();
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+    }
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+    size_ = size;
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+
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+    // Context options
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+    auto canvas_attribs = std::vector<int>{};
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+    //NOLINTNEXTLINE
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+    #define GLBACKEND_WXWIDGETS_CANVAS_ATTRIBS_INSERT_(...) \
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+        canvas_attribs.insert(canvas_attribs.end(), __VA_ARGS__);
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+    GLBACKEND_WXWIDGETS_CANVAS_ATTRIBS_INSERT_({
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+        WX_GL_RGBA,
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+        WX_GL_DOUBLEBUFFER,
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+        WX_GL_MIN_RED, 8,
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+        WX_GL_MIN_GREEN, 8,
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+        WX_GL_MIN_BLUE, 8,
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+        WX_GL_MIN_ALPHA, 8,
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+        WX_GL_DEPTH_SIZE, 24,
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+        WX_GL_STENCIL_SIZE, 8,
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+    })
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+    if (samples)
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+        GLBACKEND_WXWIDGETS_CANVAS_ATTRIBS_INSERT_({
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+            WX_GL_SAMPLE_BUFFERS, 1,
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+            WX_GL_SAMPLES, samples,
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+        })
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+    if (version[0])
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+        GLBACKEND_WXWIDGETS_CANVAS_ATTRIBS_INSERT_({
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+            WX_GL_MAJOR_VERSION, version[0],
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+        })
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+    if (version[1])
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+        GLBACKEND_WXWIDGETS_CANVAS_ATTRIBS_INSERT_({
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+            WX_GL_MINOR_VERSION, version[1],
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+        })
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+    if ((version[0] == 3 && version[1] >= 2) || version[0] >= 4) // NOLINT
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+        GLBACKEND_WXWIDGETS_CANVAS_ATTRIBS_INSERT_({
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+            WX_GL_CORE_PROFILE,
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+        })
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+    GLBACKEND_WXWIDGETS_CANVAS_ATTRIBS_INSERT_({
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+        0
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+    });
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+
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+    try
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+    {
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+        // Frame
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+        frame_ = new wxFrame(); // NOLINT
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+        if (transparent)
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+            frame_->SetBackgroundStyle(wxBG_STYLE_TRANSPARENT);
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+        frame_->Create(
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+            nullptr,
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+            wxID_ANY,
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+            title,
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+            wxDefaultPosition,
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+            wxDefaultSize,
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+            frame_style
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+        );
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+        frame_->SetClientSize(size[0], size[1]);
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+        if (fullscreen)
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+            frame_->ShowFullScreen(true);
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+        else
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+            frame_->Show(true);
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+
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+        // Canvas
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+        canvas_ = new Canvas{ // NOLINT
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+            frame_,
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+            wxID_ANY,
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+            &canvas_attribs[0],
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+            wxDefaultPosition,
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+            {size[0], size[1]},
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+        };
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+
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+        // Context
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+        context_ = new wxGLContext(canvas_); // NOLINT
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+        events(); // NOLINT
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+        context_->SetCurrent(*canvas_);
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+        init_();
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+
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+        // Lock
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+        if (fullscreen)
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+            lock(true);
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+    }
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+    catch (...)
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+    {
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+        destroy_();
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+        throw;
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+    }
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+}
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+
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+
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+GLBackendWxWidgets::~GLBackendWxWidgets()
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+{
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+    destroy_();
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+}
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+
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+
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+std::string GLBackendWxWidgets::debug_info() const
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+{
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+    auto ostream = std::ostringstream{};
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+
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+    auto version_compiled = wxGetLibraryVersionInfo().GetVersionString();
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+    auto version_linked   = wxString(wxVERSION_STRING);
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+    auto os               = wxGetOsDescription();
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+    auto port             = wxPlatformInfo::Get().GetPortIdName();
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+    debug_info_(ostream, "wxWidgets", {
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+        {"VERSION_COMPILED", version_compiled.ToStdString()},
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+        {"VERSION_LINKED",   version_linked  .ToStdString()},
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+        {"OS",               os              .ToStdString()},
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+        {"PORT",             port            .ToStdString()},
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+    });
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+
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+    ostream << GLBackend::debug_info();
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+
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+    return ostream.str();
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+}
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+
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+
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+// TODO(rcrnstn): Implement wxWidgets event handling.
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+// void GLBackendWxWidgets::paint_(wxPaintEvent& WXUNUSED(event))
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+// {
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+//     wxPaintDC paint_dc(this);
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+//     if (render_)
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+//         render_();
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+// }
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+
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+
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+void GLBackendWxWidgets::destroy_()
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+{
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+    delete context_;
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+    if (canvas_)
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+    {
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+        lock(false);
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+        canvas_->Destroy();
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+    }
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+    if (frame_)
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+        frame_->Destroy();
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+    events(); // NOLINT
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+    if (app_)
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+    {
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+        app_->OnExit();
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+        wxEntryCleanup();
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+    }
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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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+
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+#endif