initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/samples/opengl/cube/cube.cpp

@@ -0,0 +1,518 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        cube.cpp
+// Purpose:     wxGLCanvas demo program
+// Author:      Julian Smart
+// Modified by: Vadim Zeitlin to use new wxGLCanvas API (2007-04-09)
+// Created:     04/01/98
+// Copyright:   (c) Julian Smart
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+
+#ifndef WX_PRECOMP
+#include "wx/wx.h"
+#endif
+
+#if !wxUSE_GLCANVAS
+    #error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
+#endif
+
+#include "cube.h"
+
+#ifndef wxHAS_IMAGES_IN_RESOURCES
+    #include "../../sample.xpm"
+#endif
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// control ids
+enum
+{
+    SpinTimer = wxID_HIGHEST
+};
+
+// ----------------------------------------------------------------------------
+// helper functions
+// ----------------------------------------------------------------------------
+
+static void CheckGLError()
+{
+    GLenum errLast = GL_NO_ERROR;
+
+    for ( ;; )
+    {
+        GLenum err = glGetError();
+        if ( err == GL_NO_ERROR )
+            return;
+
+        // normally the error is reset by the call to glGetError() but if
+        // glGetError() itself returns an error, we risk looping forever here
+        // so check that we get a different error than the last time
+        if ( err == errLast )
+        {
+            wxLogError("OpenGL error state couldn't be reset.");
+            return;
+        }
+
+        errLast = err;
+
+        wxLogError("OpenGL error %d", err);
+    }
+}
+
+// function to draw the texture for cube faces
+static wxImage DrawDice(int size, unsigned num)
+{
+    wxASSERT_MSG( num >= 1 && num <= 6, "invalid dice index" );
+
+    const int dot = size/16;        // radius of a single dot
+    const int gap = 5*size/32;      // gap between dots
+
+    wxBitmap bmp(size, size);
+    wxMemoryDC dc;
+    dc.SelectObject(bmp);
+    dc.SetBackground(*wxWHITE_BRUSH);
+    dc.Clear();
+    dc.SetBrush(*wxBLACK_BRUSH);
+
+    // the upper left and lower right points
+    if ( num != 1 )
+    {
+        dc.DrawCircle(gap + dot, gap + dot, dot);
+        dc.DrawCircle(size - gap - dot, size - gap - dot, dot);
+    }
+
+    // draw the central point for odd dices
+    if ( num % 2 )
+    {
+        dc.DrawCircle(size/2, size/2, dot);
+    }
+
+    // the upper right and lower left points
+    if ( num > 3 )
+    {
+        dc.DrawCircle(size - gap - dot, gap + dot, dot);
+        dc.DrawCircle(gap + dot, size - gap - dot, dot);
+    }
+
+    // finally those 2 are only for the last dice
+    if ( num == 6 )
+    {
+        dc.DrawCircle(gap + dot, size/2, dot);
+        dc.DrawCircle(size - gap - dot, size/2, dot);
+    }
+
+    dc.SelectObject(wxNullBitmap);
+
+    return bmp.ConvertToImage();
+}
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// TestGLContext
+// ----------------------------------------------------------------------------
+
+TestGLContext::TestGLContext(wxGLCanvas *canvas)
+             : wxGLContext(canvas)
+{
+    SetCurrent(*canvas);
+
+    // set up the parameters we want to use
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    glEnable(GL_TEXTURE_2D);
+
+    // add slightly more light, the default lighting is rather dark
+    GLfloat ambient[] = { 0.5, 0.5, 0.5, 0.5 };
+    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
+
+    // set viewing projection
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glFrustum(-0.5, 0.5, -0.5, 0.5, 1, 3);
+
+    // create the textures to use for cube sides: they will be reused by all
+    // canvases (which is probably not critical in the case of simple textures
+    // we use here but could be really important for a real application where
+    // each texture could take many megabytes)
+    glGenTextures(WXSIZEOF(m_textures), m_textures);
+
+    for ( unsigned i = 0; i < WXSIZEOF(m_textures); i++ )
+    {
+        glBindTexture(GL_TEXTURE_2D, m_textures[i]);
+
+        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+        const wxImage img(DrawDice(256, i + 1));
+
+        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img.GetWidth(), img.GetHeight(),
+                     0, GL_RGB, GL_UNSIGNED_BYTE, img.GetData());
+    }
+
+    CheckGLError();
+}
+
+void TestGLContext::DrawRotatedCube(float xangle, float yangle)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef(0.0f, 0.0f, -2.0f);
+    glRotatef(xangle, 1.0f, 0.0f, 0.0f);
+    glRotatef(yangle, 0.0f, 1.0f, 0.0f);
+
+    // draw six faces of a cube of size 1 centered at (0, 0, 0)
+    glBindTexture(GL_TEXTURE_2D, m_textures[0]);
+    glBegin(GL_QUADS);
+        glNormal3f( 0.0f, 0.0f, 1.0f);
+        glTexCoord2f(0, 0); glVertex3f( 0.5f, 0.5f, 0.5f);
+        glTexCoord2f(1, 0); glVertex3f(-0.5f, 0.5f, 0.5f);
+        glTexCoord2f(1, 1); glVertex3f(-0.5f,-0.5f, 0.5f);
+        glTexCoord2f(0, 1); glVertex3f( 0.5f,-0.5f, 0.5f);
+    glEnd();
+
+    glBindTexture(GL_TEXTURE_2D, m_textures[1]);
+    glBegin(GL_QUADS);
+        glNormal3f( 0.0f, 0.0f,-1.0f);
+        glTexCoord2f(0, 0); glVertex3f(-0.5f,-0.5f,-0.5f);
+        glTexCoord2f(1, 0); glVertex3f(-0.5f, 0.5f,-0.5f);
+        glTexCoord2f(1, 1); glVertex3f( 0.5f, 0.5f,-0.5f);
+        glTexCoord2f(0, 1); glVertex3f( 0.5f,-0.5f,-0.5f);
+    glEnd();
+
+    glBindTexture(GL_TEXTURE_2D, m_textures[2]);
+    glBegin(GL_QUADS);
+        glNormal3f( 0.0f, 1.0f, 0.0f);
+        glTexCoord2f(0, 0); glVertex3f( 0.5f, 0.5f, 0.5f);
+        glTexCoord2f(1, 0); glVertex3f( 0.5f, 0.5f,-0.5f);
+        glTexCoord2f(1, 1); glVertex3f(-0.5f, 0.5f,-0.5f);
+        glTexCoord2f(0, 1); glVertex3f(-0.5f, 0.5f, 0.5f);
+    glEnd();
+
+    glBindTexture(GL_TEXTURE_2D, m_textures[3]);
+    glBegin(GL_QUADS);
+        glNormal3f( 0.0f,-1.0f, 0.0f);
+        glTexCoord2f(0, 0); glVertex3f(-0.5f,-0.5f,-0.5f);
+        glTexCoord2f(1, 0); glVertex3f( 0.5f,-0.5f,-0.5f);
+        glTexCoord2f(1, 1); glVertex3f( 0.5f,-0.5f, 0.5f);
+        glTexCoord2f(0, 1); glVertex3f(-0.5f,-0.5f, 0.5f);
+    glEnd();
+
+    glBindTexture(GL_TEXTURE_2D, m_textures[4]);
+    glBegin(GL_QUADS);
+        glNormal3f( 1.0f, 0.0f, 0.0f);
+        glTexCoord2f(0, 0); glVertex3f( 0.5f, 0.5f, 0.5f);
+        glTexCoord2f(1, 0); glVertex3f( 0.5f,-0.5f, 0.5f);
+        glTexCoord2f(1, 1); glVertex3f( 0.5f,-0.5f,-0.5f);
+        glTexCoord2f(0, 1); glVertex3f( 0.5f, 0.5f,-0.5f);
+    glEnd();
+
+    glBindTexture(GL_TEXTURE_2D, m_textures[5]);
+    glBegin(GL_QUADS);
+        glNormal3f(-1.0f, 0.0f, 0.0f);
+        glTexCoord2f(0, 0); glVertex3f(-0.5f,-0.5f,-0.5f);
+        glTexCoord2f(1, 0); glVertex3f(-0.5f,-0.5f, 0.5f);
+        glTexCoord2f(1, 1); glVertex3f(-0.5f, 0.5f, 0.5f);
+        glTexCoord2f(0, 1); glVertex3f(-0.5f, 0.5f,-0.5f);
+    glEnd();
+
+    glFlush();
+
+    CheckGLError();
+}
+
+
+// ----------------------------------------------------------------------------
+// MyApp: the application object
+// ----------------------------------------------------------------------------
+
+wxIMPLEMENT_APP(MyApp);
+
+bool MyApp::OnInit()
+{
+    if ( !wxApp::OnInit() )
+        return false;
+
+    new MyFrame();
+
+    return true;
+}
+
+int MyApp::OnExit()
+{
+    delete m_glContext;
+    delete m_glStereoContext;
+
+    return wxApp::OnExit();
+}
+
+TestGLContext& MyApp::GetContext(wxGLCanvas *canvas, bool useStereo)
+{
+    TestGLContext *glContext;
+    if ( useStereo )
+    {
+        if ( !m_glStereoContext )
+        {
+            // Create the OpenGL context for the first stereo window which needs it:
+            // subsequently created windows will all share the same context.
+            m_glStereoContext = new TestGLContext(canvas);
+        }
+        glContext = m_glStereoContext;
+    }
+    else
+    {
+        if ( !m_glContext )
+        {
+            // Create the OpenGL context for the first mono window which needs it:
+            // subsequently created windows will all share the same context.
+            m_glContext = new TestGLContext(canvas);
+        }
+        glContext = m_glContext;
+    }
+
+    glContext->SetCurrent(*canvas);
+
+    return *glContext;
+}
+
+// ----------------------------------------------------------------------------
+// TestGLCanvas
+// ----------------------------------------------------------------------------
+
+wxBEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
+    EVT_PAINT(TestGLCanvas::OnPaint)
+    EVT_KEY_DOWN(TestGLCanvas::OnKeyDown)
+    EVT_TIMER(SpinTimer, TestGLCanvas::OnSpinTimer)
+wxEND_EVENT_TABLE()
+
+TestGLCanvas::TestGLCanvas(wxWindow *parent, bool useStereo)
+    // With perspective OpenGL graphics, the wxFULL_REPAINT_ON_RESIZE style
+    // flag should always be set, because even making the canvas smaller should
+    // be followed by a paint event that updates the entire canvas with new
+    // viewport settings.
+    : m_xangle(30.0),
+      m_yangle(30.0),
+      m_spinTimer(this,SpinTimer),
+      m_useStereo(useStereo),
+      m_stereoWarningAlreadyDisplayed(false)
+{
+    wxGLAttributes attribs = wxGLAttributes().Defaults();
+    if ( useStereo )
+        attribs.Stereo();
+    attribs.EndList();
+
+    if ( !wxGLCanvas::Create(parent, attribs, wxID_ANY,
+                             wxDefaultPosition, wxDefaultSize,
+                             wxFULL_REPAINT_ON_RESIZE) )
+    {
+        wxLogError("Creating OpenGL window failed.");
+    }
+}
+
+void TestGLCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
+{
+    // This is required even though dc is not used otherwise.
+    wxPaintDC dc(this);
+
+    // Set the OpenGL viewport according to the client size of this canvas.
+    // This is done here rather than in a wxSizeEvent handler because our
+    // OpenGL rendering context (and thus viewport setting) is used with
+    // multiple canvases: If we updated the viewport in the wxSizeEvent
+    // handler, changing the size of one canvas causes a viewport setting that
+    // is wrong when next another canvas is repainted.
+    const wxSize ClientSize = GetClientSize() * GetContentScaleFactor();
+
+    TestGLContext& canvas = wxGetApp().GetContext(this, m_useStereo);
+    glViewport(0, 0, ClientSize.x, ClientSize.y);
+
+    // Render the graphics and swap the buffers.
+    GLboolean quadStereoSupported;
+    glGetBooleanv( GL_STEREO, &quadStereoSupported);
+    if ( quadStereoSupported )
+    {
+        glDrawBuffer( GL_BACK_LEFT );
+        glMatrixMode(GL_PROJECTION);
+        glLoadIdentity();
+        glFrustum(-0.47, 0.53, -0.5, 0.5, 1, 3);
+        canvas.DrawRotatedCube(m_xangle, m_yangle);
+        CheckGLError();
+        glDrawBuffer( GL_BACK_RIGHT );
+        glMatrixMode(GL_PROJECTION);
+        glLoadIdentity();
+        glFrustum(-0.53, 0.47, -0.5, 0.5, 1, 3);
+        canvas.DrawRotatedCube(m_xangle, m_yangle);
+        CheckGLError();
+    }
+    else
+    {
+        canvas.DrawRotatedCube(m_xangle, m_yangle);
+        if ( m_useStereo && !m_stereoWarningAlreadyDisplayed )
+        {
+            m_stereoWarningAlreadyDisplayed = true;
+            wxLogError("Stereo not supported by the graphics card.");
+        }
+    }
+    SwapBuffers();
+}
+
+void TestGLCanvas::Spin(float xSpin, float ySpin)
+{
+    m_xangle += xSpin;
+    m_yangle += ySpin;
+
+    Refresh(false);
+}
+
+void TestGLCanvas::OnKeyDown(wxKeyEvent& event)
+{
+    float angle = 5.0;
+
+    switch ( event.GetKeyCode() )
+    {
+        case WXK_RIGHT:
+            Spin( 0.0, -angle );
+            break;
+
+        case WXK_LEFT:
+            Spin( 0.0, angle );
+            break;
+
+        case WXK_DOWN:
+            Spin( -angle, 0.0 );
+            break;
+
+        case WXK_UP:
+            Spin( angle, 0.0 );
+            break;
+
+        case WXK_SPACE:
+            if ( m_spinTimer.IsRunning() )
+                m_spinTimer.Stop();
+            else
+                m_spinTimer.Start( 25 );
+            break;
+
+        default:
+            event.Skip();
+            return;
+    }
+}
+
+void TestGLCanvas::OnSpinTimer(wxTimerEvent& WXUNUSED(event))
+{
+    Spin(0.0, 4.0);
+}
+
+wxString glGetwxString(GLenum name)
+{
+    const GLubyte *v = glGetString(name);
+    if ( v == nullptr )
+    {
+        // The error is not important. It is GL_INVALID_ENUM.
+        // We just want to clear the error stack.
+        glGetError();
+
+        return wxString();
+    }
+
+    return wxString((const char*)v);
+}
+
+
+// ----------------------------------------------------------------------------
+// MyFrame: main application window
+// ----------------------------------------------------------------------------
+
+wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
+    EVT_MENU(wxID_NEW, MyFrame::OnNewWindow)
+    EVT_MENU(NEW_STEREO_WINDOW, MyFrame::OnNewStereoWindow)
+    EVT_MENU(wxID_CLOSE, MyFrame::OnClose)
+wxEND_EVENT_TABLE()
+
+MyFrame::MyFrame( bool stereoWindow )
+       : wxFrame(nullptr, wxID_ANY, "wxWidgets OpenGL Cube Sample")
+{
+    new TestGLCanvas(this, stereoWindow);
+
+    SetIcon(wxICON(sample));
+
+    // Make a menubar
+    wxMenu *menu = new wxMenu;
+    menu->Append(wxID_NEW);
+    menu->Append(NEW_STEREO_WINDOW, "New Stereo Window");
+    menu->AppendSeparator();
+    menu->Append(wxID_CLOSE);
+    wxMenuBar *menuBar = new wxMenuBar;
+    menuBar->Append(menu, "&Cube");
+
+    SetMenuBar(menuBar);
+
+    CreateStatusBar();
+
+    SetClientSize(400, 400);
+    Show();
+
+    // test IsDisplaySupported() function:
+    wxGLAttributes attribs;
+    attribs.RGBA().DoubleBuffer().EndList();
+    wxLogStatus("Double-buffered display %s supported",
+                wxGLCanvas::IsDisplaySupported(attribs) ? "is" : "not");
+
+    if ( stereoWindow )
+    {
+        const wxString vendor = glGetwxString(GL_VENDOR).Lower();
+        const wxString renderer = glGetwxString(GL_RENDERER).Lower();
+        if ( vendor.find("nvidia") != wxString::npos &&
+                renderer.find("quadro") == wxString::npos )
+            ShowFullScreen(true);
+    }
+}
+
+void MyFrame::OnClose(wxCommandEvent& WXUNUSED(event))
+{
+    // true is to force the frame to close
+    Close(true);
+}
+
+void MyFrame::OnNewWindow( wxCommandEvent& WXUNUSED(event) )
+{
+    new MyFrame();
+}
+
+void MyFrame::OnNewStereoWindow( wxCommandEvent& WXUNUSED(event) )
+{
+    wxGLAttributes attribs;
+    attribs.RGBA().DoubleBuffer().Stereo().EndList();
+    if ( wxGLCanvas::IsDisplaySupported(attribs) )
+    {
+        new MyFrame(true);
+    }
+    else
+    {
+        wxLogError("Stereo not supported by OpenGL on this system, sorry.");
+    }
+}