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c8bc03c33262c4be312f5f1f2bf74a3f20e691dd
wxWidgets/utils/glcanvas/gtk/glcanvas.cpp
Robert Roebling 7941ba111c Applied patch for multiple file selection, documented. 
Fixed some compilation warnings,
  Minor change to OpenGL code.
  Documented wxImageHandler::GetImageCount() and related.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4784 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1999-12-01 14:08:42 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: glcanvas.cpp
// Purpose: wxGLCanvas, for using OpenGL/Mesa with wxWindows and GTK
// Author: Robert Roebling
// Modified by:
// Created: 17/08/98
// RCS-ID: $Id$
// Copyright: (c) Robert Roebling
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "glcanvas.h"
#endif
#include "glcanvas.h"
#include "wx/frame.h"
#include "wx/colour.h"
#include "wx/module.h"
#include "wx/app.h"
extern "C" {
#include "gtk/gtk.h"
#include "gdk/gdk.h"
#include "gdk/gdkx.h"
}
#include "wx/gtk/win_gtk.h"
//---------------------------------------------------------------------------
// global data
//---------------------------------------------------------------------------
XVisualInfo *g_vi = (XVisualInfo*) NULL;
//-----------------------------------------------------------------------------
// idle system
//-----------------------------------------------------------------------------
extern void wxapp_install_idle_handler();
extern bool g_isIdle;
//---------------------------------------------------------------------------
// wxGLContext
//---------------------------------------------------------------------------
IMPLEMENT_CLASS(wxGLContext,wxObject)
wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
{
m_window = win;
m_widget = win->m_wxwindow;
wxGLCanvas *gc = (wxGLCanvas*) win;
XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
wxCHECK_RET( vi, "invalid visual for OpenGl" );
m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
}
wxGLContext::wxGLContext(
bool WXUNUSED(isRGB), wxWindow *win,
const wxPalette& WXUNUSED(palette),
const wxGLContext *other /* for sharing display lists */
)
{
m_window = win;
m_widget = win->m_wxwindow;
wxGLCanvas *gc = (wxGLCanvas*) win;
XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
wxCHECK_RET( vi, "invalid visual for OpenGl" );
if( other != 0 )
m_glContext = glXCreateContext( GDK_DISPLAY(), vi, other->m_glContext, GL_TRUE );
else
m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
}
wxGLContext::~wxGLContext()
{
if (!m_glContext) return;
if (m_glContext == glXGetCurrentContext())
{
glXMakeCurrent( GDK_DISPLAY(), None, NULL);
}
glXDestroyContext( GDK_DISPLAY(), m_glContext );
}
void wxGLContext::SwapBuffers()
{
if (m_glContext)
{
GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
}
}
void wxGLContext::SetCurrent()
{
if (m_glContext)
{
GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
}
}
void wxGLContext::SetColour(const char *colour)
{
float r = 0.0;
float g = 0.0;
float b = 0.0;
wxColour *col = wxTheColourDatabase->FindColour(colour);
if (col)
{
r = (float)(col->Red()/256.0);
g = (float)(col->Green()/256.0);
b = (float)(col->Blue()/256.0);
glColor3f( r, g, b);
}
}
void wxGLContext::SetupPixelFormat()
{
}
void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
{
}
wxPalette wxGLContext::CreateDefaultPalette()
{
return wxNullPalette;
}
//-----------------------------------------------------------------------------
// "realize" from m_wxwindow
//-----------------------------------------------------------------------------
static gint
gtk_glwindow_realized_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
{
win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, win->m_sharedContext );
return FALSE;
}
//-----------------------------------------------------------------------------
// "map" from m_wxwindow
//-----------------------------------------------------------------------------
static gint
gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
{
if (win->m_glContext/* && win->m_exposed*/)
{
wxPaintEvent event( win->GetId() );
event.SetEventObject( win );
win->GetEventHandler()->ProcessEvent( event );
win->m_exposed = FALSE;
win->GetUpdateRegion().Clear();
}
return FALSE;
}
//-----------------------------------------------------------------------------
// "expose_event" of m_wxwindow
//-----------------------------------------------------------------------------
static void
gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
{
if (g_isIdle)
wxapp_install_idle_handler();
win->m_exposed = TRUE;
win->GetUpdateRegion().Union( gdk_event->area.x,
gdk_event->area.y,
gdk_event->area.width,
gdk_event->area.height );
}
//-----------------------------------------------------------------------------
// "draw" of m_wxwindow
//-----------------------------------------------------------------------------
static void
gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
{
if (g_isIdle)
wxapp_install_idle_handler();
win->m_exposed = TRUE;
win->GetUpdateRegion().Union( rect->x, rect->y,
rect->width, rect->height );
}
//-----------------------------------------------------------------------------
// "size_allocate" of m_wxwindow
//-----------------------------------------------------------------------------
static void
gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
{
if (g_isIdle)
wxapp_install_idle_handler();
if (!win->m_hasVMT)
return;
wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
event.SetEventObject( win );
win->GetEventHandler()->ProcessEvent( event );
}
//---------------------------------------------------------------------------
// wxGlCanvas
//---------------------------------------------------------------------------
IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
EVT_SIZE(wxGLCanvas::OnSize)
END_EVENT_TABLE()
wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
const wxPoint& pos, const wxSize& size,
long style, const wxString& name,
int *attribList,
const wxPalette& palette )
{
Create( parent, NULL, id, pos, size, style, name, attribList, palette );
}
wxGLCanvas::wxGLCanvas( wxWindow *parent,
const wxGLContext *shared,
wxWindowID id,
const wxPoint& pos, const wxSize& size,
long style, const wxString& name,
int *attribList,
const wxPalette& palette )
{
Create( parent, shared, id, pos, size, style, name, attribList, palette );
}
bool wxGLCanvas::Create( wxWindow *parent,
const wxGLContext *shared,
wxWindowID id,
const wxPoint& pos, const wxSize& size,
long style, const wxString& name,
int *attribList,
const wxPalette& palette)
{
m_sharedContext = (wxGLContext*)shared; // const_cast
m_glContext = (wxGLContext*) NULL;
m_exposed = FALSE;
m_noExpose = TRUE;
m_nativeSizeEvent = TRUE;
if (!attribList)
{
int data[] = { GLX_RGBA,
GLX_DOUBLEBUFFER,
GLX_DEPTH_SIZE, 1, // use largest available depth buffer
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_ALPHA_SIZE, 0,
None };
attribList = (int*) data;
}
else
{
int data[512], arg=0, p=0;
while( (attribList[arg]!=0) && (p<512) )
{
switch( attribList[arg++] )
{
case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
case WX_GL_DEPTH_SIZE:
data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
case WX_GL_MIN_RED:
data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
case WX_GL_MIN_GREEN:
data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
case WX_GL_MIN_BLUE:
data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
default:
break;
}
}
data[p] = 0;
attribList = (int*) data;
}
Display *dpy = GDK_DISPLAY();
XVisualInfo *vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
m_vi = vi; // safe for later use
wxCHECK_MSG( m_vi, FALSE, "required visual couldn't be found" );
GdkVisual *visual = gdkx_visual_get( vi->visualid );
GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(vi->visualid), TRUE );
gtk_widget_push_colormap( colormap );
gtk_widget_push_visual( visual );
wxScrolledWindow::Create( parent, id, pos, size, style, name );
m_glWidget = m_wxwindow;
gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
gtk_widget_pop_visual();
gtk_widget_pop_colormap();
return TRUE;
}
wxGLCanvas::~wxGLCanvas()
{
XVisualInfo *vi = (XVisualInfo *) m_vi;
if (vi)
XFree( vi );
if (m_glContext) delete m_glContext;
}
void wxGLCanvas::SwapBuffers()
{
if (m_glContext) m_glContext->SwapBuffers();
}
void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
{
int width, height;
GetClientSize( &width, &height );
if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
{
SetCurrent();
glViewport(0, 0, (GLint)width, (GLint)height );
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
glMatrixMode(GL_MODELVIEW);
}
}
void wxGLCanvas::SetCurrent()
{
if (m_glContext) m_glContext->SetCurrent();
}
void wxGLCanvas::SetColour( const char *colour )
{
if (m_glContext) m_glContext->SetColour( colour );
}
void wxGLCanvas::OnInternalIdle()
{
if (m_glContext && m_exposed)
{
wxPaintEvent event( GetId() );
event.SetEventObject( this );
GetEventHandler()->ProcessEvent( event );
m_exposed = FALSE;
GetUpdateRegion().Clear();
}
wxWindow::OnInternalIdle();
}
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