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//
// "$Id: Fl_Gl_Choice.cxx,v 1.5 1999/01/07 19:17:20 mike Exp $"
//
// OpenGL visual selection code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-1999 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@easysw.com".
//
#include <config.h>
#if HAVE_GL
#include <FL/Fl.H>
#include <FL/x.H>
#include <stdlib.h>
#include "Fl_Gl_Choice.H"
static Fl_Gl_Choice *first;
GLXContext fl_first_context;
// this assummes one of the two arguments is zero:
// We keep the list system in Win32 to stay compatible and interpret
// the list later...
Fl_Gl_Choice *Fl_Gl_Choice::find(int mode, const int *alist) {
Fl_Gl_Choice *g;
for (g = first; g; g = g->next)
if (g->mode == mode && g->alist == alist)
return g;
#ifndef WIN32
const int *blist;
int list[32];
if (alist)
blist = alist;
else {
int n = 0;
if (mode & FL_INDEX) {
list[n++] = GLX_BUFFER_SIZE;
list[n++] = 8; // glut tries many sizes, but this should work...
} else {
list[n++] = GLX_RGBA;
list[n++] = GLX_GREEN_SIZE;
list[n++] = (mode & FL_RGB8) ? 8 : 1;
if (mode & FL_ALPHA) {
list[n++] = GLX_ALPHA_SIZE;
list[n++] = 1;
}
if (mode & FL_ACCUM) {
list[n++] = GLX_ACCUM_GREEN_SIZE;
list[n++] = 1;
if (mode & FL_ALPHA) {
list[n++] = GLX_ACCUM_ALPHA_SIZE;
list[n++] = 1;
}
}
}
if (mode & FL_DOUBLE) {
list[n++] = GLX_DOUBLEBUFFER;
}
if (mode & FL_DEPTH) {
list[n++] = GLX_DEPTH_SIZE; list[n++] = 1;
}
if (mode & FL_STENCIL) {
list[n++] = GLX_STENCIL_SIZE; list[n++] = 1;
}
#if defined(GLX_VERSION_1_1) && defined(GLX_SGIS_multisample)
if (mode & FL_MULTISAMPLE) {
list[n++] = GLX_SAMPLES_SGIS;
list[n++] = 4; // value Glut uses
}
#endif
list[n] = 0;
blist = list;
}
fl_open_display();
XVisualInfo *vis = glXChooseVisual(fl_display, fl_screen, (int *)blist);
if (!vis) {
# if defined(GLX_VERSION_1_1) && defined(GLX_SGIS_multisample)
if (mode&FL_MULTISAMPLE) return find(mode&~FL_MULTISAMPLE,0);
# endif
return 0;
}
#else
PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR), 1,
PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL,
PFD_TYPE_RGBA, 8 };
if (mode & FL_INDEX) {
pfd.iPixelType = PFD_TYPE_COLORINDEX;
pfd.cColorBits = 8;
} else {
if (mode & FL_ALPHA) pfd.cAlphaBits = 8;
if (mode & FL_ACCUM) {
pfd.cAccumBits = 6; // Wonko: I didn't find any documentation on those bits
pfd.cAccumGreenBits = 1; // Wonko: They don't seem to get any support yet (4/98)
if (mode & FL_ALPHA) pfd.cAccumAlphaBits = 1;
}
}
if (mode & FL_DOUBLE) pfd.dwFlags |= PFD_DOUBLEBUFFER;
if (mode & FL_DEPTH) pfd.cDepthBits = 16;
if (mode & FL_STENCIL) pfd.cStencilBits = 1;
pfd.bReserved = 1; // always ask for overlay
#endif
g = new Fl_Gl_Choice;
g->mode = mode;
g->alist = alist;
g->next = first;
first = g;
#ifdef WIN32
memcpy(&g->pfd, &pfd, sizeof(PIXELFORMATDESCRIPTOR));
g->d = ((mode&FL_DOUBLE) != 0);
g->r = (mode & FL_INDEX);
g->o = 0; // not an overlay
#else
g->vis = vis;
g->colormap = 0;
int i;
glXGetConfig(fl_display, vis, GLX_DOUBLEBUFFER, &i); g->d = i;
glXGetConfig(fl_display, vis, GLX_RGBA, &i); g->r = i;
glXGetConfig(fl_display, vis, GLX_LEVEL, &i); g->o = i;
if (/*MaxCmapsOfScreen(ScreenOfDisplay(fl_display,fl_screen))==1 && */
vis->visualid == fl_visual->visualid &&
!getenv("MESA_PRIVATE_CMAP"))
g->colormap = fl_colormap;
else
g->colormap = XCreateColormap(fl_display, RootWindow(fl_display,fl_screen),
vis->visual, AllocNone);
#endif
return g;
}
#ifdef WIN32
HDC fl_private_dc(Fl_Window* w, int mode, Fl_Gl_Choice **gp) {
Fl_X* i = Fl_X::i(w);
if (!i->private_dc) {
i->private_dc = GetDCEx(i->xid, 0, DCX_CACHE);
Fl_Gl_Choice *g = Fl_Gl_Choice::find(mode, 0);
if (gp) *gp = g;
int pixelFormat = ChoosePixelFormat(i->private_dc, &g->pfd);
if (!pixelFormat) {Fl::error("Insufficient GL support"); return NULL;}
SetPixelFormat(i->private_dc, pixelFormat, &g->pfd);
#if USE_COLORMAP
if (fl_palette) SelectPalette(i->private_dc, fl_palette, FALSE);
#endif
}
return i->private_dc;
}
#endif
#endif
//
// End of "$Id: Fl_Gl_Choice.cxx,v 1.5 1999/01/07 19:17:20 mike Exp $".
//
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