utils/glcanvas/src/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL/Mesa with wxWindows and GTK
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     17/08/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "glcanvas.h"
  14 #endif
  15
  16 #include "wx/wxprec.h"
  17
  18 #include "wx/frame.h"
  19 #include "wx/colour.h"
  20 #include "glcanvas.h"
  21 #include <gdk/gdkx.h>
  22
  23 //---------------------------------------------------------------------------
  24 // wxGLContext
  25 //---------------------------------------------------------------------------
  26
  27 IMPLEMENT_CLASS(wxGLContext,wxObject)
  28
  29 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  30 {
  31   m_window = win;
  32   m_widget = win->m_wxwindow;
  33
  34   int data[] = {GLX_RGBA,GLX_RED_SIZE,1,GLX_GREEN_SIZE,1,
  35                 GLX_BLUE_SIZE,1,GLX_DOUBLEBUFFER,None};
  36
  37   Display *display = GDK_WINDOW_XDISPLAY( m_widget->window );
  38   XVisualInfo *visual_info = glXChooseVisual( display, DefaultScreen(display), data );
  39
  40   wxCHECK_RET( visual_info != NULL, "Couldn't choose visual for OpenGl" );
  41
  42   m_glContext = glXCreateContext( display, visual_info, None, GL_TRUE );
  43
  44   wxCHECK_RET( m_glContext != NULL, "Couldn't create OpenGl context" );
  45
  46   glXMakeCurrent( display, GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
  47 }
  48
  49 wxGLContext::~wxGLContext()
  50 {
  51   if (m_glContext)
  52   {
  53     Display *display = GDK_WINDOW_XDISPLAY( m_widget->window );
  54     glXMakeCurrent( display, GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
  55
  56     glXDestroyContext( display, m_glContext );
  57   }
  58 }
  59
  60 void wxGLContext::SwapBuffers()
  61 {
  62   if (m_glContext)
  63   {
  64     Display *display = GDK_WINDOW_XDISPLAY( m_widget->window );
  65     glXSwapBuffers( display, GDK_WINDOW_XWINDOW( m_widget->window ) );
  66   }
  67 }
  68
  69 void wxGLContext::SetCurrent()
  70 {
  71   if (m_glContext)
  72   {
  73     Display *display = GDK_WINDOW_XDISPLAY( m_widget->window );
  74     glXMakeCurrent( display, GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
  75   }
  76 }
  77
  78 void wxGLContext::SetColour(const char *colour)
  79 {
  80   float r = 0.0;
  81   float g = 0.0;
  82   float b = 0.0;
  83   wxColour *col = wxTheColourDatabase->FindColour(colour);
  84   if (col)
  85   {
  86     r = (float)(col->Red()/256.0);
  87     g = (float)(col->Green()/256.0);
  88     b = (float)(col->Blue()/256.0);
  89     glColor3f( r, g, b);
  90   }
  91 }
  92
  93 void wxGLContext::SetupPixelFormat()
  94 {
  95 }
  96
  97 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
  98 {
  99 }
 100
 101 wxPalette wxGLContext::CreateDefaultPalette()
 102 {
 103   return wxNullPalette;
 104 }
 105
 106 //---------------------------------------------------------------------------
 107 // wxGlCanvas
 108 //---------------------------------------------------------------------------
 109
 110 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 111
 112 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 113     EVT_SIZE(wxGLCanvas::OnSize)
 114 END_EVENT_TABLE()
 115
 116 wxGLCanvas::wxGLCanvas(wxWindow *parent, wxWindowID id,
 117     const wxPoint& pos, const wxSize& size, long style, const wxString& name,
 118     int *WXUNUSED(attribList), const wxPalette& palette):
 119   wxScrolledWindow(parent, id, pos, size, style, name)
 120 {
 121   m_glContext = new wxGLContext( TRUE, this, palette );
 122 }
 123
 124 wxGLCanvas::~wxGLCanvas()
 125 {
 126   if (m_glContext) delete m_glContext;
 127 }
 128
 129 void wxGLCanvas::SwapBuffers()
 130 {
 131   if (m_glContext) m_glContext->SwapBuffers();
 132 }
 133
 134 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 135 {
 136   int width, height;
 137   GetClientSize(& width, & height);
 138
 139   if (m_glContext)
 140   {
 141     m_glContext->SetCurrent();
 142
 143     glViewport(0, 0, (GLint)width, (GLint)height);
 144     glMatrixMode(GL_PROJECTION);
 145     glLoadIdentity();
 146     glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 147     glMatrixMode(GL_MODELVIEW);
 148   }
 149 }
 150
 151 void wxGLCanvas::SetCurrent()
 152 {
 153   if (m_glContext) m_glContext->SetCurrent();
 154 }
 155
 156 void wxGLCanvas::SetColour( const char *colour )
 157 {
 158   if (m_glContext) m_glContext->SetColour( colour );
 159 }
 160
 161