progs/beos/demo.cpp

   1 // $Id: demo.cpp,v 1.2 2004/08/14 09:59:16 phoudoin Exp $
   2
   3 // Simple BeOS GLView demo
   4 // Written by Brian Paul
   5 // Changes by Philippe Houdoin
   6 // This file is in the public domain.
   7
   8
   9
  10 #include <stdio.h>
  11 #include <Application.h>
  12 #include <Window.h>
  13 #include <GLView.h>
  14
  15 class MyGL : public BGLView
  16 {
  17 public:
  18         MyGL(BRect rect, char *name, ulong options);
  19
  20         virtual void AttachedToWindow();
  21         virtual void Pulse();
  22         virtual void FrameResized(float w, float h);
  23
  24 private:
  25         void Render();
  26         void Reshape(float w, float h);
  27         float mAngle;
  28 };
  29
  30
  31 class MyWindow : public BWindow
  32 {
  33 public:
  34         MyWindow(BRect frame);
  35         virtual bool QuitRequested();
  36 };
  37
  38
  39 MyWindow::MyWindow(BRect frame)
  40    : BWindow(frame, "demo", B_TITLED_WINDOW, B_NOT_ZOOMABLE)
  41 {
  42    // Make OpenGL view and put it in the window
  43    BRect r = Bounds();
  44    r.InsetBy(5, 5);
  45
  46    MyGL *gl = new MyGL(r, "GL", BGL_RGB | BGL_DOUBLE);
  47    AddChild(gl);
  48    SetPulseRate(1000000 / 30);
  49 }
  50
  51 bool MyWindow::QuitRequested()
  52 {
  53    be_app->PostMessage(B_QUIT_REQUESTED);
  54    return true;
  55 }
  56
  57
  58
  59 MyGL::MyGL(BRect rect, char *name, ulong options)
  60    : BGLView(rect, name, B_FOLLOW_ALL_SIDES, B_PULSE_NEEDED, options)
  61 {
  62         mAngle = 0.0;
  63 }
  64
  65
  66 void MyGL::AttachedToWindow()
  67 {
  68         BGLView::AttachedToWindow();
  69
  70         LockGL();
  71         glClearColor(0.7, 0.7, 0, 0);
  72         Reshape(Bounds().Width(), Bounds().Height());
  73         UnlockGL();
  74 }
  75
  76
  77 void MyGL::FrameResized(float w, float h)
  78 {
  79         BGLView::FrameResized(w, h);
  80
  81         LockGL();
  82         Reshape(w, h);
  83         UnlockGL();
  84
  85         Render();
  86 }
  87
  88
  89 void MyGL::Pulse()
  90 {
  91         mAngle += 1.0;
  92         Render();
  93 }
  94
  95
  96 void MyGL::Render()
  97 {
  98     LockGL();
  99
 100     glClear(GL_COLOR_BUFFER_BIT);
 101
 102     glPushMatrix();
 103
 104     glRotated(mAngle, 0, 0, 1);
 105     glColor3f(0, 0, 1);
 106
 107     glBegin(GL_POLYGON);
 108     glVertex2f(-1, -1);
 109     glVertex2f( 1, -1);
 110     glVertex2f( 1,  1);
 111     glVertex2f(-1,  1);
 112     glEnd();
 113
 114         glPopMatrix();
 115
 116     SwapBuffers();
 117
 118     UnlockGL();
 119 }
 120
 121
 122 void MyGL::Reshape(float w, float h)
 123 {
 124         glViewport(0, 0, (int) (w + 1), (int) (h + 1));
 125         glMatrixMode(GL_PROJECTION);
 126         glLoadIdentity();
 127         glFrustum(-1, 1, -1, 1, 10, 30);
 128         glMatrixMode(GL_MODELVIEW);
 129         glLoadIdentity();
 130         glTranslatef(0, 0, -18);
 131 }
 132
 133
 134 int main(int argc, char *argv[])
 135 {
 136    BApplication *app = new BApplication("application/demo");
 137
 138    // make top-level window
 139    MyWindow *win = new MyWindow(BRect(100, 100, 500, 500));
 140    win->Show();
 141
 142     app->Run();
 143
 144    delete app;
 145
 146    return 0;
 147 }