progs/beos/sample.cpp

   1 // sample BGLView app from the Be Book
   2
   3
   4 #include <stdio.h>
   5 #include <Application.h>
   6 #include <Window.h>
   7 #include <GLView.h>
   8
   9
  10 class SampleGLView : public BGLView
  11 {
  12 public:
  13    SampleGLView(BRect frame, uint32 type);
  14    virtual void   AttachedToWindow(void);
  15    virtual void   FrameResized(float newWidth, float newHeight);
  16    virtual void   ErrorCallback(GLenum which);
  17
  18    void         Render(void);
  19
  20 private:
  21    void         gInit(void);
  22    void         gDraw(void);
  23    void         gReshape(int width, int height);
  24
  25    float         width;
  26    float         height;
  27 };
  28
  29
  30
  31 class SampleGLWindow : public BWindow
  32 {
  33 public:
  34    SampleGLWindow(BRect frame, uint32 type);
  35    virtual bool   QuitRequested() { be_app->PostMessage(B_QUIT_REQUESTED); return true; }
  36
  37 private:
  38    SampleGLView   *theView;
  39 };
  40
  41
  42 class SampleGLApp : public BApplication
  43 {
  44 public:
  45    SampleGLApp();
  46 private:
  47    SampleGLWindow      *theWindow;
  48 };
  49
  50
  51 SampleGLApp::SampleGLApp()
  52    : BApplication("application/x-vnd.sample")
  53 {
  54    BRect windowRect;
  55    uint32 type = BGL_RGB|BGL_DOUBLE;
  56
  57    windowRect.Set(50, 50, 350, 350);
  58
  59    theWindow = new SampleGLWindow(windowRect, type);
  60 }
  61
  62
  63
  64 SampleGLWindow::SampleGLWindow(BRect frame, uint32 type)
  65    : BWindow(frame, "OpenGL Test", B_TITLED_WINDOW, 0)
  66 {
  67    theView = new SampleGLView(Bounds(), type);
  68    AddChild(theView);
  69    Show();
  70    theView->Render();
  71 }
  72
  73
  74
  75 SampleGLView::SampleGLView(BRect frame, uint32 type)
  76    : BGLView(frame, "SampleGLView", B_FOLLOW_ALL_SIDES, 0, type)
  77 {
  78    width = frame.right-frame.left;
  79    height = frame.bottom-frame.top;
  80 }
  81
  82
  83 void SampleGLView::AttachedToWindow(void)
  84 {
  85    LockGL();
  86    BGLView::AttachedToWindow();
  87    gInit();
  88    gReshape(width, height);
  89    UnlockGL();
  90 }
  91
  92
  93 void SampleGLView::FrameResized(float newWidth, float newHeight)
  94 {
  95    BGLView::FrameResized(newWidth, newHeight);
  96
  97    LockGL();
  98
  99    width = newWidth;
 100    height = newHeight;
 101
 102    gReshape(width,height);
 103
 104    UnlockGL();
 105    Render();
 106 }
 107
 108
 109 void SampleGLView::ErrorCallback(GLenum whichError)
 110 {
 111 //      fprintf(stderr, "Unexpected error occured (%d):\\n", whichError);
 112 //      fprintf(stderr, "    %s\\n", gluErrorString(whichError));
 113 }
 114
 115
 116
 117 // globals
 118 GLenum use_stipple_mode;    // GL_TRUE to use dashed lines
 119 GLenum use_smooth_mode;     // GL_TRUE to use anti-aliased lines
 120 GLint linesize;             // Line width
 121 GLint pointsize;            // Point diameter
 122
 123 float pntA[3] = {
 124    -160.0, 0.0, 0.0
 125 };
 126 float pntB[3] = {
 127    -130.0, 0.0, 0.0
 128 };
 129
 130
 131
 132 void SampleGLView::gInit(void)
 133 {
 134    glClearColor(0.0, 0.0, 0.0, 0.0);
 135    glLineStipple(1, 0xF0E0);
 136    glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 137    use_stipple_mode = GL_FALSE;
 138    use_smooth_mode = GL_TRUE;
 139    linesize = 2;
 140    pointsize = 6;
 141 }
 142
 143
 144
 145 void SampleGLView::gDraw(void)
 146 {
 147    GLint i;
 148
 149    glClear(GL_COLOR_BUFFER_BIT);
 150    glLineWidth(linesize);
 151
 152 /*
 153
 154    if (use_stipple_mode) {
 155       glEnable(GL_LINE_STIPPLE);
 156    } else {
 157       glDisable(GL_LINE_STIPPLE);
 158    }
 159 */
 160
 161    glDisable(GL_POINT_SMOOTH);
 162
 163
 164    glPushMatrix();
 165
 166    glPointSize(pointsize);         // Set size for point
 167
 168    for (i = 0; i < 360; i += 5) {
 169       glRotatef(5.0, 0,0,1);         // Rotate right 5 degrees
 170
 171           if (use_smooth_mode) {
 172                 glEnable(GL_LINE_SMOOTH);
 173             glEnable(GL_BLEND);
 174            } else {
 175               glDisable(GL_LINE_SMOOTH);
 176               glDisable(GL_BLEND);
 177            }
 178
 179       glColor3f(1.0, 1.0, 0.0);      // Set color for line
 180       glBegin(GL_LINE_STRIP);         // And create the line
 181         glVertex3fv(pntA);
 182         glVertex3fv(pntB);
 183       glEnd();
 184
 185       glDisable(GL_POINT_SMOOTH);
 186       glDisable(GL_BLEND);
 187
 188       glColor3f(0.0, 1.0, 0.0);      // Set color for point
 189       glBegin(GL_POINTS);
 190         glVertex3fv(pntA);         // Draw point at one end
 191         glVertex3fv(pntB);         // Draw point at other end
 192       glEnd();
 193    }
 194
 195    glPopMatrix();                  // Done with matrix
 196 }
 197
 198
 199 void SampleGLView::gReshape(int width, int height)
 200 {
 201    glViewport(0, 0, width, height);
 202    glMatrixMode(GL_PROJECTION);
 203    glLoadIdentity();
 204    glOrtho(-175, 175, -175, 175, -1, 1);
 205    glMatrixMode(GL_MODELVIEW);
 206 }
 207
 208
 209 void SampleGLView::Render(void)
 210 {
 211    LockGL();
 212    gDraw();
 213    SwapBuffers();
 214    UnlockGL();
 215 }
 216
 217
 218
 219 int main(int argc, char *argv[])
 220 {
 221    SampleGLApp *app = new SampleGLApp;
 222    app->Run();
 223    delete app;
 224    return 0;
 225 }