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265b457741
wxWidgets/utils/glcanvas/gtk/glcanvas.cpp
Sylvain Bougnoux 265b457741 just disable alpha buffer to make it more portable as 
many hardware doesn't have a true alpha plane !


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3359 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1999-08-12 15:02:44 +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;
//---------------------------------------------------------------------------
// wxGLContext
//---------------------------------------------------------------------------
IMPLEMENT_CLASS(wxGLContext,wxObject)
wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
{
m_window = win;
m_widget = ((wxGLCanvas*)win)->m_glWidget;
wxCHECK_RET( g_vi, "invalid visual for OpenGl" );
m_glContext = glXCreateContext( GDK_DISPLAY(), g_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 = ((wxGLCanvas*)win)->m_glWidget;
wxCHECK_RET( g_vi, "invalid visual for OpenGl" );
if( other != 0 )
m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, other->m_glContext,
GL_TRUE );
else
m_glContext = glXCreateContext( GDK_DISPLAY(), g_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)
{
glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( m_widget->window ) );
}
}
void wxGLContext::SetCurrent()
{
if (m_glContext)
{
glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(m_widget->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;
}
//-----------------------------------------------------------------------------
// "expose_event" of m_glWidget
//-----------------------------------------------------------------------------
static void gtk_window_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxWindow *win )
{
if (!win->m_hasVMT) return;
win->GetUpdateRegion().Union( gdk_event->area.x,
gdk_event->area.y,
gdk_event->area.width,
gdk_event->area.height );
if (gdk_event->count > 0) return;
/*
printf( "OnExpose from " );
if (win->GetClassInfo() && win->GetClassInfo()->GetClassName())
printf( win->GetClassInfo()->GetClassName() );
printf( ".\n" );
*/
wxPaintEvent event( win->GetId() );
event.SetEventObject( win );
win->GetEventHandler()->ProcessEvent( event );
win->GetUpdateRegion().Clear();
}
//-----------------------------------------------------------------------------
// "draw" of m_glWidget
//-----------------------------------------------------------------------------
static void gtk_window_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxWindow *win )
{
if (!win->m_hasVMT) return;
win->GetUpdateRegion().Union( rect->x, rect->y, rect->width, rect->height );
wxPaintEvent event( win->GetId() );
event.SetEventObject( win );
win->GetEventHandler()->ProcessEvent( event );
win->GetUpdateRegion().Clear();
}
//---------------------------------------------------------------------------
// 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)
{
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();
g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
gtk_widget_push_colormap( colormap );
gtk_widget_push_visual( visual );
m_glWidget = gtk_myfixed_new();
gtk_widget_pop_visual();
gtk_widget_pop_colormap();
wxScrolledWindow::Create( parent, id, pos, size, style, name );
GTK_WIDGET_UNSET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
GTK_WIDGET_SET_FLAGS( m_glWidget, GTK_CAN_FOCUS );
gtk_myfixed_put( GTK_MYFIXED(m_wxwindow), m_glWidget, 0, 0, m_width, m_height );
gtk_signal_connect( GTK_OBJECT(m_glWidget), "expose_event",
GTK_SIGNAL_FUNC(gtk_window_expose_callback), (gpointer)this );
gtk_signal_connect( GTK_OBJECT(m_glWidget), "draw",
GTK_SIGNAL_FUNC(gtk_window_draw_callback), (gpointer)this );
/* connect to key press and mouse handlers etc. */
ConnectWidget( m_glWidget );
/* must be realized for OpenGl output */
gtk_widget_realize( m_glWidget );
gtk_widget_show( m_glWidget );
m_glContext = new wxGLContext( TRUE, this, palette, shared );
XFree( g_vi );
g_vi = (XVisualInfo*) NULL;
gdk_window_set_back_pixmap( m_glWidget->window, None, 0 );
return TRUE;
}
wxGLCanvas::~wxGLCanvas()
{
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();
// gdk_window_set_back_pixmap( gtk_widget_get_parent_window(m_glWidget), None, 0 );
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::DoSetSize( int x, int y, int width, int height, int sizeFlags )
{
if (m_resizing) return; // I don't like recursions
m_resizing = TRUE;
if (m_parent->m_wxwindow == NULL) // i.e. wxNotebook
{
// don't set the size for children of wxNotebook, just take the values.
m_x = x;
m_y = y;
m_width = width;
m_height = height;
}
else
{
int old_width = m_width;
int old_height = m_height;
if ((sizeFlags & wxSIZE_ALLOW_MINUS_ONE) == 0)
{
if (x != -1) m_x = x;
if (y != -1) m_y = y;
if (width != -1) m_width = width;
if (height != -1) m_height = height;
}
else
{
m_x = x;
m_y = y;
m_width = width;
m_height = height;
}
if ((sizeFlags & wxSIZE_AUTO_WIDTH) == wxSIZE_AUTO_WIDTH)
{
if (width == -1) m_width = 80;
}
if ((sizeFlags & wxSIZE_AUTO_HEIGHT) == wxSIZE_AUTO_HEIGHT)
{
if (height == -1) m_height = 26;
}
if ((m_minWidth != -1) && (m_width < m_minWidth)) m_width = m_minWidth;
if ((m_minHeight != -1) && (m_height < m_minHeight)) m_height = m_minHeight;
if ((m_maxWidth != -1) && (m_width > m_maxWidth)) m_width = m_maxWidth;
if ((m_maxHeight != -1) && (m_height > m_maxHeight)) m_height = m_maxHeight;
gtk_myfixed_set_size( GTK_MYFIXED(m_parent->m_wxwindow),
m_widget,
m_x,
m_y,
m_width,
m_height );
gtk_myfixed_set_size( GTK_MYFIXED(m_wxwindow),
m_glWidget,
m_x,
m_y,
m_width,
m_height );
}
m_sizeSet = TRUE;
wxSizeEvent event( wxSize(m_width,m_height), GetId() );
event.SetEventObject( this );
GetEventHandler()->ProcessEvent( event );
m_resizing = FALSE;
}
GtkWidget *wxGLCanvas::GetConnectWidget()
{
return m_glWidget;
}
bool wxGLCanvas::IsOwnGtkWindow( GdkWindow *window )
{
return (window == m_glWidget->window);
}
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