From 50f5d508a868be985e7ac91e84b62c13c2ea1ad9 Mon Sep 17 00:00:00 2001 From: Vadim Zeitlin Date: Sun, 15 Apr 2007 00:54:32 +0000 Subject: [PATCH] reorganized the code to put the logic in wxGLContext-derived class but keep the state in the window git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45476 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775 --- samples/opengl/cube/cube.cpp | 175 ++++++++++++++++++++----------------------- samples/opengl/cube/cube.h | 47 ++++++------ 2 files changed, 104 insertions(+), 118 deletions(-) diff --git a/samples/opengl/cube/cube.cpp b/samples/opengl/cube/cube.cpp index 4b549dc..b3bcb9f 100644 --- a/samples/opengl/cube/cube.cpp +++ b/samples/opengl/cube/cube.cpp @@ -66,79 +66,29 @@ int MyApp::OnExit() return wxApp::OnExit(); } -void MyApp::SetCurrent(wxGLCanvas *canvas) +TestGLContext& MyApp::GetContext(wxGLCanvas *canvas) { - wxCHECK_RET( canvas, _T("canvas can't be NULL") ); - if ( !m_glContext ) - m_glContext = new wxGLContext(canvas); + m_glContext = new TestGLContext(canvas); m_glContext->SetCurrent(*canvas); + + return *m_glContext; } // ---------------------------------------------------------------------------- -// TestGLCanvas +// TestGLContext // ---------------------------------------------------------------------------- -BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas) - EVT_SIZE(TestGLCanvas::OnSize) - EVT_PAINT(TestGLCanvas::OnPaint) - - EVT_KEY_DOWN(TestGLCanvas::OnKeyDown) -END_EVENT_TABLE() - -static const int attribs[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, 0 }; - -TestGLCanvas::TestGLCanvas(wxWindow *parent) - : wxGLCanvas(parent, wxID_ANY, NULL /* attribs */) +TestGLContext::TestGLContext(wxGLCanvas *canvas) + : wxGLContext(canvas) { m_gllist = 0; - - // notice that we can't call InitGL() from here: we must wait until the - // window is shown on screen to be able to perform OpenGL calls -} - -// this function is called on each repaint so it should be fast -void TestGLCanvas::Render() -{ - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); - glCallList(m_gllist); - - glFlush(); - SwapBuffers(); -} - -void TestGLCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) -{ - wxGetApp().SetCurrent(this); - - // initialize if not done yet - InitGL(); - - wxPaintDC dc(this); - - Render(); } -void TestGLCanvas::OnSize(wxSizeEvent& event) +void TestGLContext::Init() { - // don't prevent default processing from taking place - event.Skip(); - - if ( !IsInitialized() ) - return; - - // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...) - int w, h; - GetClientSize(&w, &h); - - wxGetApp().SetCurrent(this); - glViewport(0, 0, w, h); -} - -void TestGLCanvas::InitGL() -{ - if ( IsInitialized() ) + if ( m_gllist ) return; /* set viewing projection */ @@ -146,21 +96,12 @@ void TestGLCanvas::InitGL() glLoadIdentity(); glFrustum(-0.5f, 0.5f, -0.5f, 0.5f, 1.0f, 3.0f); - /* position viewer */ - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - glTranslatef(0.0f, 0.0f, -2.0f); - - /* position object */ - glRotatef(30.0f, 1.0f, 0.0f, 0.0f); - glRotatef(30.0f, 0.0f, 1.0f, 0.0f); - glEnable(GL_DEPTH_TEST); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); // create the list of commands to draw the cube: then we can just (quickly) - // execute it in Render() later + // execute it in DrawRotatedCube() later m_gllist = glGenLists(1); glNewList(m_gllist, GL_COMPILE); @@ -194,11 +135,69 @@ void TestGLCanvas::InitGL() glEndList(); } +void TestGLContext::DrawRotatedCube(float xangle, float yangle) +{ + Init(); + + 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); + + glCallList(m_gllist); + + glFlush(); +} + +// ---------------------------------------------------------------------------- +// TestGLCanvas +// ---------------------------------------------------------------------------- + +BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas) + EVT_SIZE(TestGLCanvas::OnSize) + EVT_PAINT(TestGLCanvas::OnPaint) + + EVT_KEY_DOWN(TestGLCanvas::OnKeyDown) +END_EVENT_TABLE() + +TestGLCanvas::TestGLCanvas(wxWindow *parent) + : wxGLCanvas(parent, wxID_ANY, NULL /* attribs */) +{ + m_xangle = + m_yangle = 30; +} + +void TestGLCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) +{ + wxPaintDC dc(this); + + wxGetApp().GetContext(this).DrawRotatedCube(m_xangle, m_yangle); + + SwapBuffers(); +} + +void TestGLCanvas::OnSize(wxSizeEvent& event) +{ + // don't prevent default processing from taking place + event.Skip(); + + if ( !IsShown() ) + return; + + // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...) + int w, h; + GetClientSize(&w, &h); + + wxGetApp().GetContext(this); + glViewport(0, 0, w, h); +} + void TestGLCanvas::OnKeyDown( wxKeyEvent& event ) { - GLfloat x = 0, - y = 0, - z = 0; + float *p = NULL; bool inverse = false; @@ -209,8 +208,8 @@ void TestGLCanvas::OnKeyDown( wxKeyEvent& event ) // fall through case WXK_LEFT: - // rotate around Z axis - z = 1; + // rotate around Y axis + p = &m_yangle; break; case WXK_DOWN: @@ -218,8 +217,8 @@ void TestGLCanvas::OnKeyDown( wxKeyEvent& event ) // fall through case WXK_UP: - // rotate around Y axis - y = 1; + // rotate around X axis + p = &m_xangle; break; default: @@ -231,19 +230,9 @@ void TestGLCanvas::OnKeyDown( wxKeyEvent& event ) if ( inverse ) angle = -angle; - wxGetApp().SetCurrent(this); + *p += angle; - glMatrixMode(GL_MODELVIEW); - glRotatef(angle, x, y, z); - - // refresh all cubes - for ( wxWindowList::const_iterator i = wxTopLevelWindows.begin(); - i != wxTopLevelWindows.end(); - ++i ) - { - MyFrame *frame = (MyFrame *)*i; - frame->RefreshCanvas(); - } + Refresh(false); } // ---------------------------------------------------------------------------- @@ -256,10 +245,9 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame) END_EVENT_TABLE() MyFrame::MyFrame() - : wxFrame(NULL, wxID_ANY, _T("wxWidgets OpenGL Cube Sample"), - wxDefaultPosition, wxSize(400, 300)) + : wxFrame(NULL, wxID_ANY, _T("wxWidgets OpenGL Cube Sample")) { - m_canvas = new TestGLCanvas(this); + new TestGLCanvas(this); SetIcon(wxICON(sample)); @@ -275,6 +263,7 @@ MyFrame::MyFrame() CreateStatusBar(); + SetClientSize(400, 400); Show(); } @@ -289,7 +278,3 @@ void MyFrame::OnNewWindow( wxCommandEvent& WXUNUSED(event) ) (void) new MyFrame(); } -void MyFrame::RefreshCanvas() -{ - m_canvas->Refresh(false); -} diff --git a/samples/opengl/cube/cube.h b/samples/opengl/cube/cube.h index a67e7b0..1e1ff95 100644 --- a/samples/opengl/cube/cube.h +++ b/samples/opengl/cube/cube.h @@ -14,14 +14,32 @@ #include "wx/glcanvas.h" +// the rendering context used by all GL canvases +class TestGLContext : public wxGLContext +{ +public: + TestGLContext(wxGLCanvas *canvas); + + // render the cube showing it at given angles + void DrawRotatedCube(float xangle, float yangle); + +private: + // one-time OpenGL initialization, safe to call many times + void Init(); + + + // the list of commands to draw the cube + GLuint m_gllist; +}; + // Define a new application type class MyApp: public wxApp { public: MyApp() { m_glContext = NULL; } - // set the specified canvas for current output - void SetCurrent(wxGLCanvas *canvas); + // get the context we use creating it on demand (and set it as current) + TestGLContext& GetContext(wxGLCanvas *canvas); // virtual wxApp methods virtual bool OnInit(); @@ -29,29 +47,21 @@ public: private: // the GL context we use for all our windows - wxGLContext *m_glContext; + TestGLContext *m_glContext; }; // Define a new frame type -class TestGLCanvas; - class MyFrame: public wxFrame { public: MyFrame(); - // update the image shown on the canvas (after the shared wxGLContext was - // updated, presumably) - void RefreshCanvas(); - private: void OnClose(wxCommandEvent& event); void OnNewWindow(wxCommandEvent& event); void OnDefRotateLeftKey(wxCommandEvent& event); void OnDefRotateRightKey(wxCommandEvent& event); - TestGLCanvas *m_canvas; - DECLARE_EVENT_TABLE() }; @@ -65,18 +75,9 @@ private: void OnSize(wxSizeEvent& event); void OnKeyDown(wxKeyEvent& event); - // OpenGL calls can't be done until we're initialized - bool IsInitialized() const { return m_gllist != 0; } - - // one-time OpenGL initialization, only does something if !IsInitialized() - void InitGL(); - - // render to window - void Render(); - - - // the list of commands to draw the cube - GLuint m_gllist; + // angles of rotation around x- and y- axis + float m_xangle, + m_yangle; DECLARE_EVENT_TABLE() }; -- 2.7.4