+/////////////////////////////////////////////////////////////////////////////
+// Name: glcanvas.cpp
+// Purpose: wxGLCanvas, for using OpenGL with wxWindows 2.0 for Motif.
+// Uses the GLX extension.
+// Author: Julian Smart and Wolfram Gloger
+// Modified by:
+// Created: 1995, 1999
+// RCS-ID: $Id$
+// Copyright: (c) Julian Smart, Wolfram Gloger
+// Licence: wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifdef __GNUG__
+#pragma implementation "glcanvas.h"
+#endif
+
+#include "glcanvas.h"
+#include "wx/utils.h"
+#include "wx/app.h"
+
+#include <Xm/Xm.h>
+#include "wx/motif/private.h"
+
+#ifdef OLD_MESA
+// workaround for bug in Mesa's glx.c
+static int bitcount( unsigned long n )
+{
+ int bits;
+ for (bits=0; n>0;) {
+ if(n & 1) bits++;
+ n = n >> 1;
+ }
+ return bits;
+}
+#endif
+
+/*
+ * GLCanvas implementation
+ */
+
+IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
+
+wxGLCanvas::wxGLCanvas(wxWindow *parent, wxWindowID id = -1, const wxPoint& pos,
+ const wxSize& size, long style,
+ const wxString& name, int *attrib_list, const wxPalette& palette):
+ wxScrolledWindow(parent, id, pos, size, style, name)
+{
+ XVisualInfo *vi, vi_templ;
+ XWindowAttributes xwa;
+ int val, n;
+
+ Display* display = (Display*) GetXDisplay();
+
+ glx_cx = 0;
+ // Check for the presence of the GLX extension
+ if(!glXQueryExtension(display, NULL, NULL)) {
+ wxDebugMsg("wxGLCanvas: GLX extension is missing\n");
+ return;
+ }
+
+ if(attrib_list) {
+ // Get an appropriate visual
+ vi = glXChooseVisual(display, DefaultScreen(display), attrib_list);
+ if(!vi) return;
+
+ // Here we should make sure that vi is the same visual as the
+ // one used by the xwindow drawable in wxCanvas. However,
+ // there is currently no mechanism for this in wx_canvs.cc.
+ } else {
+ // By default, we use the visual of xwindow
+ XGetWindowAttributes(display, (Window) GetXWindow(), &xwa);
+ vi_templ.visualid = XVisualIDFromVisual(xwa.visual);
+ vi = XGetVisualInfo(display, VisualIDMask, &vi_templ, &n);
+ if(!vi) return;
+ glXGetConfig(display, vi, GLX_USE_GL, &val);
+ if(!val) return;
+ // Basically, this is it. It should be possible to use vi
+ // in glXCreateContext() below. But this fails with Mesa.
+ // I notified the Mesa author about it; there may be a fix.
+#ifdef OLD_MESA
+ // Construct an attribute list matching the visual
+ int a_list[32];
+ n = 0;
+ if(vi->c_class==TrueColor || vi->c_class==DirectColor) { // RGBA visual
+ a_list[n++] = GLX_RGBA;
+ a_list[n++] = GLX_RED_SIZE;
+ a_list[n++] = bitcount(vi->red_mask);
+ a_list[n++] = GLX_GREEN_SIZE;
+ a_list[n++] = bitcount(vi->green_mask);
+ a_list[n++] = GLX_BLUE_SIZE;
+ a_list[n++] = bitcount(vi->blue_mask);
+ glXGetConfig(display, vi, GLX_ALPHA_SIZE, &val);
+ a_list[n++] = GLX_ALPHA_SIZE;
+ a_list[n++] = val;
+ } else { // Color index visual
+ glXGetConfig(display, vi, GLX_BUFFER_SIZE, &val);
+ a_list[n++] = GLX_BUFFER_SIZE;
+ a_list[n++] = val;
+ }
+ a_list[n] = None;
+ XFree(vi);
+ vi = glXChooseVisual(display, DefaultScreen(display), a_list);
+ if(!vi) return;
+#endif /* OLD_MESA */
+ }
+
+ // Create the GLX context and make it current
+ glx_cx = glXCreateContext(display, vi, 0, GL_TRUE);
+#ifndef OLD_MESA
+ XFree(vi);
+#endif
+ SetCurrent();
+}
+
+wxGLCanvas::~wxGLCanvas(void)
+{
+ Display* display = (Display*) GetXDisplay();
+ if(glx_cx) glXDestroyContext(display, glx_cx);
+}
+
+void wxGLCanvas::SwapBuffers()
+{
+ Display* display = (Display*) GetXDisplay();
+ if(glx_cx) glXSwapBuffers(display, (Window) GetXWindow());
+}
+
+void wxGLCanvas::SetCurrent()
+{
+ Display* display = (Display*) GetXDisplay();
+ if(glx_cx) glXMakeCurrent(display, (Window) GetXWindow(), glx_cx);
+}
+
+void wxGLCanvas::SetColour(const char *col)
+{
+ wxColour *the_colour = wxTheColourDatabase->FindColour(col);
+ if(the_colour) {
+ GLboolean b;
+ glGetBooleanv(GL_RGBA_MODE, &b);
+ if(b) {
+ glColor3ub(the_colour->Red(),
+ the_colour->Green(),
+ the_colour->Blue());
+ } else {
+ GLint pix = (GLint)the_colour->m_pixel;
+ if(pix == -1) {
+ XColor exact_def;
+ exact_def.red = (unsigned short)the_colour->Red() << 8;
+ exact_def.green = (unsigned short)the_colour->Green() << 8;
+ exact_def.blue = (unsigned short)the_colour->Blue() << 8;
+ exact_def.flags = DoRed | DoGreen | DoBlue;
+ if(!XAllocColor((Display*) GetXDisplay(), (Colormap) wxTheApp->GetMainColormap(GetXDisplay()), &exact_def)) {
+ wxDebugMsg("wxGLCanvas: cannot allocate color\n");
+ return;
+ }
+ pix = the_colour->m_pixel = exact_def.pixel;
+ }
+ glIndexi(pix);
+ }
+ }
+}
+
projects / wxWidgets.git / commitdiff
