progs/beos/demo.cpp

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