ref: 9eaba52cafcac7c2f3bfc72d7be1f15893196be1
dir: /DoConfig/fltk/src/glut_compatability.cxx/
//
// "$Id$"
//
// GLUT emulation routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2016 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
// Emulation of Glut using fltk.
// GLUT is Copyright (c) Mark J. Kilgard, 1994, 1995, 1996.
// "This program is freely distributable without licensing fees and is
// provided without guarantee or warrantee expressed or implied. This
// program is -not- in the public domain."
// Although I have copied the GLUT API, none of my code is based on
// any Glut implementation details and is therefore covered by the LGPL.
#include "flstring.h"
#if HAVE_GL
# include <FL/glut.H>
# ifdef HAVE_GLXGETPROCADDRESSARB
# define GLX_GLXEXT_LEGACY
# include <GL/glx.h>
# endif // HAVE_GLXGETPROCADDRESSARB
# if HAVE_DLFCN_H
# include <dlfcn.h>
# endif // HAVE_DLFCN_H
# define MAXWINDOWS 32
# ifdef __APPLE__
# include <FL/x.H>
# endif
static Fl_Glut_Window *windows[MAXWINDOWS+1];
static void (*glut_idle_func)() = 0; // global glut idle function
Fl_Glut_Window *glut_window;
int glut_menu;
void (*glut_menustate_function)(int);
void (*glut_menustatus_function)(int,int,int);
static void default_reshape(int w, int h) {glViewport(0,0,w,h);}
static void default_display() {}
void Fl_Glut_Window::make_current() {
glut_window = this;
if (shown()) Fl_Gl_Window::make_current();
}
static int indraw;
void Fl_Glut_Window::draw() {
glut_window = this;
indraw = 1;
if (!valid()) {reshape(pixel_w(),pixel_h()); valid(1);}
display();
indraw = 0;
}
void glutSwapBuffers() {
if (!indraw) glut_window->swap_buffers();
}
void Fl_Glut_Window::draw_overlay() {
glut_window = this;
if (!valid()) {reshape(pixel_w(),pixel_h()); valid(1);}
overlaydisplay();
}
static void domenu(int, int, int);
int Fl_Glut_Window::handle(int event) {
make_current();
int ex = Fl::event_x();
int ey = Fl::event_y();
float factor = pixels_per_unit();
ex = int(ex * factor + 0.5);
ey = int(ey * factor + 0.5);
int button;
switch (event) {
case FL_PUSH:
if (keyboard || special) Fl::focus(this);
button = Fl::event_button()-1;
if (button<0) button = 0;
if (button>2) button = 2;
if (menu[button]) {domenu(menu[button],ex,ey); return 1;}
mouse_down |= 1<<button;
if (mouse) {mouse(button,GLUT_DOWN,ex,ey); return 1;}
if (motion) return 1;
break;
case FL_MOUSEWHEEL:
button = Fl::event_dy();
while (button < 0) {if (mouse) mouse(3,GLUT_DOWN,ex,ey); ++button;}
while (button > 0) {if (mouse) mouse(4,GLUT_DOWN,ex,ey); --button;}
return 1;
case FL_RELEASE:
for (button = 0; button < 3; button++) if (mouse_down & (1<<button)) {
if (mouse) mouse(button,GLUT_UP,ex,ey);
}
mouse_down = 0;
return 1;
case FL_ENTER:
if (entry) {entry(GLUT_ENTERED); return 1;}
if (passivemotion) return 1;
break;
case FL_LEAVE:
if (entry) {entry(GLUT_LEFT); return 1;}
if (passivemotion) return 1;
break;
case FL_DRAG:
if (motion) {motion(ex, ey); return 1;}
break;
case FL_MOVE:
if (passivemotion) {passivemotion(ex, ey); return 1;}
break;
case FL_FOCUS:
if (keyboard || special) return 1;
break;
case FL_SHORTCUT:
if (!keyboard && !special) break;
case FL_KEYBOARD:
if (Fl::event_text()[0]) {
if (keyboard) {keyboard(Fl::event_text()[0],ex,ey); return 1;}
break;
} else {
if (special) {
int k = Fl::event_key();
if (k > FL_F && k <= FL_F_Last) k -= FL_F;
special(k,ex,ey);
return 1;
}
break;
}
case FL_HIDE:
if (visibility) visibility(GLUT_NOT_VISIBLE);
break;
case FL_SHOW:
if (visibility) visibility(GLUT_VISIBLE);
break;
}
return Fl_Gl_Window::handle(event);
}
static int glut_mode = GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH;
void Fl_Glut_Window::_init() {
for (number=1; number<MAXWINDOWS; number++) if (!windows[number]) break;
windows[number] = this;
menu[0] = menu[1] = menu[2] = 0;
reshape = default_reshape;
display = default_display;
overlaydisplay = default_display;
keyboard = 0;
mouse = 0;
motion = 0;
passivemotion = 0;
entry = 0;
visibility = 0;
special = 0;
mouse_down = 0;
mode(glut_mode);
}
/** Creates a glut window, registers to the glut windows list.*/
Fl_Glut_Window::Fl_Glut_Window(int W, int H, const char *t) :
Fl_Gl_Window(W,H,t) {_init();}
/** Creates a glut window, registers to the glut windows list.*/
Fl_Glut_Window::Fl_Glut_Window(int X,int Y,int W,int H, const char *t) :
Fl_Gl_Window(X,Y,W,H,t) {_init();}
static int initargc;
static char **initargv;
void glutInit(int *argc, char **argv) {
initargc = *argc;
initargv = new char*[*argc+1];
int i,j;
for (i=0; i<=*argc; i++) initargv[i] = argv[i];
for (i=j=1; i<*argc; ) {
if (Fl::arg(*argc,argv,i));
else argv[j++] = argv[i++];
}
argv[j] = 0;
*argc = j;
}
void glutInitDisplayMode(unsigned int mode) {
glut_mode = mode;
}
void glutMainLoop() {Fl::run();}
////////////////////////////////////////////////////////////////
static int initx=0, inity=0, initw=300, inith=300, initpos=0;
void glutInitWindowPosition(int x, int y) {
initx = x; inity = y; initpos = 1;
}
void glutInitWindowSize(int w, int h) {
initw = w; inith = h;
}
int glutCreateWindow(char *title) {
return glutCreateWindow((const char*)title);
}
int glutCreateWindow(const char *title) {
Fl_Glut_Window *W;
if (initpos) {
W = new Fl_Glut_Window(initx,inity,initw,inith,title);
initpos = 0;
} else {
W = new Fl_Glut_Window(initw,inith,title);
}
W->resizable(W);
if (initargc) {
W->show(initargc,initargv);
initargc = 0;
} else {
W->show();
}
W->valid(0);
W->context_valid(0);
W->make_current();
return W->number;
}
int glutCreateSubWindow(int win, int x, int y, int w, int h) {
Fl_Glut_Window *W = new Fl_Glut_Window(x,y,w,h,0);
windows[win]->add(W);
if (windows[win]->shown()) W->show();
W->make_current();
return W->number;
}
/** Destroys the glut window, first unregister it from the glut windows list */
Fl_Glut_Window::~Fl_Glut_Window() {
if (glut_window == this) glut_window = 0;
windows[number] = 0;
}
void glutDestroyWindow(int win) {
// should destroy children!!!
delete windows[win];
}
void glutPostWindowRedisplay(int win) {
windows[win]->redraw();
}
void glutSetWindow(int win) {
windows[win]->make_current();
}
////////////////////////////////////////////////////////////////
#include <FL/Fl_Menu_Item.H>
struct menu {
void (*cb)(int);
Fl_Menu_Item *m;
int size;
int alloc;
};
#define MAXMENUS 32
static menu menus[MAXMENUS+1];
static void domenu(int n, int ex, int ey) {
glut_menu = n;
menu *m = &menus[n];
if (glut_menustate_function) glut_menustate_function(1);
if (glut_menustatus_function) glut_menustatus_function(1,ex,ey);
const Fl_Menu_Item* g = m->m->popup(Fl::event_x(), Fl::event_y(), 0);
if (g && g->callback_) ((void (*)(int))(g->callback_))(int(g->argument()));
if (glut_menustatus_function) glut_menustatus_function(0,ex,ey);
if (glut_menustate_function) glut_menustate_function(0);
}
int glutCreateMenu(void (*cb)(int)) {
int i;
for (i=1; i<MAXMENUS; i++) if (!menus[i].cb) break;
menu *m = &menus[i];
m->cb = cb;
return glut_menu = i;
}
void glutDestroyMenu(int n) {
menu *m = &menus[n];
delete[] m->m;
m->m = 0;
m->cb = 0;
m->size = m->alloc = 0;
}
static Fl_Menu_Item* additem(menu *m) {
if (m->size+1 >= m->alloc) {
m->alloc = m->size*2+10;
Fl_Menu_Item* nm = new Fl_Menu_Item[m->alloc];
for (int i=0; i<m->size; i++) nm[i] = m->m[i];
delete[] m->m;
m->m = nm;
}
int n = m->size++;
m->m[n+1].text = 0;
Fl_Menu_Item* i = &(m->m[n]);
i->shortcut_ = 0;
i->flags = 0;
i->labeltype_ = i->labelfont_ = i->labelsize_ = i->labelcolor_ = 0;
return i;
}
void glutAddMenuEntry(char *label, int value) {
menu *m = &menus[glut_menu];
Fl_Menu_Item* i = additem(m);
i->text = label;
i->callback_ = (Fl_Callback*)(m->cb);
i->argument(value);
}
void glutAddSubMenu(char *label, int submenu) {
menu *m = &menus[glut_menu];
Fl_Menu_Item* i = additem(m);
i->text = label;
i->callback_ = 0;
i->user_data_ = (void *)(menus[submenu].m);
i->flags = FL_PUP_SUBMENU;
}
void glutChangeToMenuEntry(int item, char *label, int value) {
menu *m = &menus[glut_menu];
Fl_Menu_Item* i = &m->m[item-1];
i->text = label;
i->callback_ = (Fl_Callback*)(m->cb);
i->argument(value);
i->flags = 0;
}
void glutChangeToSubMenu(int item, char *label, int submenu) {
menu *m = &menus[glut_menu];
Fl_Menu_Item* i = &m->m[item-1];
i->text = label;
i->callback_ = 0;
i->user_data_ = (void *)(menus[submenu].m);
i->flags = FL_PUP_SUBMENU;
}
void glutRemoveMenuItem(int item) {
menu *m = &menus[glut_menu];
if (item > m->size || item < 1) return;
for (int i = item-1; i <= m->size; i++) m->m[i] = m->m[i+1];
m->size--;
}
////////////////////////////////////////////////////////////////
int glutGet(GLenum type) {
switch (type) {
case GLUT_RETURN_ZERO: return 0;
case GLUT_WINDOW_X: return glut_window->x();
case GLUT_WINDOW_Y: return glut_window->y();
case GLUT_WINDOW_WIDTH: return glut_window->pixel_w();
case GLUT_WINDOW_HEIGHT: return glut_window->pixel_h();
case GLUT_WINDOW_PARENT:
if (glut_window->parent())
return ((Fl_Glut_Window *)(glut_window->parent()))->number;
else
return 0;
//case GLUT_WINDOW_NUM_CHILDREN:
//case GLUT_WINDOW_CURSOR: return
case GLUT_SCREEN_WIDTH: return Fl::w();
case GLUT_SCREEN_HEIGHT: return Fl::h();
//case GLUT_SCREEN_WIDTH_MM:
//case GLUT_SCREEN_HEIGHT_MM:
case GLUT_MENU_NUM_ITEMS: return menus[glut_menu].size;
case GLUT_DISPLAY_MODE_POSSIBLE: return Fl_Gl_Window::can_do(glut_mode);
case GLUT_INIT_WINDOW_X: return initx;
case GLUT_INIT_WINDOW_Y: return inity;
case GLUT_INIT_WINDOW_WIDTH: return initw;
case GLUT_INIT_WINDOW_HEIGHT: return inith;
case GLUT_INIT_DISPLAY_MODE: return glut_mode;
//case GLUT_ELAPSED_TIME:
case GLUT_WINDOW_BUFFER_SIZE:
if (glutGet(GLUT_WINDOW_RGBA))
return glutGet(GLUT_WINDOW_RED_SIZE)+
glutGet(GLUT_WINDOW_GREEN_SIZE)+
glutGet(GLUT_WINDOW_BLUE_SIZE)+
glutGet(GLUT_WINDOW_ALPHA_SIZE);
else
return glutGet(GLUT_WINDOW_COLORMAP_SIZE);
case GLUT_VERSION: return 20400;
default: {GLint p; glGetIntegerv(type, &p); return p;}
}
}
int glutLayerGet(GLenum type) {
switch (type) {
case GLUT_OVERLAY_POSSIBLE: return glut_window->can_do_overlay();
//case GLUT_LAYER_IN_USE:
//case GLUT_HAS_OVERLAY:
case GLUT_TRANSPARENT_INDEX: return 0; // true for SGI
case GLUT_NORMAL_DAMAGED: return glut_window->damage();
case GLUT_OVERLAY_DAMAGED: return 1; // kind of works...
default: return 0;
}
}
int glutDeviceGet(GLenum type) {
switch (type) {
case GLUT_HAS_KEYBOARD : return 1;
case GLUT_HAS_MOUSE : return 1;
case GLUT_NUM_MOUSE_BUTTONS : return 3;
default : return 0;
}
}
// Get extension function address...
GLUTproc glutGetProcAddress(const char *procName) {
# ifdef WIN32
return (GLUTproc)wglGetProcAddress((LPCSTR)procName);
# elif (HAVE_DLSYM && HAVE_DLFCN_H)
char symbol[1024];
snprintf(symbol, sizeof(symbol), "_%s", procName);
# ifdef RTLD_DEFAULT
return (GLUTproc)dlsym(RTLD_DEFAULT, symbol);
# else // No RTLD_DEFAULT support, so open the current a.out symbols...
static void *rtld_default = 0;
if (!rtld_default) rtld_default = dlopen(0, RTLD_LAZY);
if (rtld_default) return (GLUTproc)dlsym(rtld_default, symbol);
else return 0;
# endif // RTLD_DEFAULT
# elif defined(HAVE_GLXGETPROCADDRESSARB)
return (GLUTproc)glXGetProcAddressARB((const GLubyte *)procName);
# else
return (GLUTproc)0;
# endif // WIN32
}
// Parse the GL_EXTENSIONS string to see if the named extension is
// supported.
//
// This code was copied from FreeGLUT 2.4.0 which carries the
// following notice:
//
// Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
int glutExtensionSupported( const char* extension )
{
if (!extension || strchr(extension, ' ')) return 0;
const char *extensions, *start;
const int len = strlen( extension );
start = extensions = (const char *) glGetString(GL_EXTENSIONS);
if (!extensions) return 0;
for (;;) {
const char *p = strstr(extensions, extension);
if (!p) return 0; /* not found */
/* check that the match isn't a super string */
if ((p == start || p[-1] == ' ') &&
(p[len] == ' ' || p[len] == 0)) return 1;
/* skip the false match and continue */
extensions = p + len;
}
}
// Add a mechanism to handle adding/removing the glut idle function
// without depending on the (deprecated) set_idle method.
void glutIdleFunc(void (*f)())
{
// no change
if(glut_idle_func == f) return;
// remove current idle
if(glut_idle_func) Fl::remove_idle((void (*)(void *))glut_idle_func);
// install new idle func - if one was passed
if(f) Fl::add_idle((void (*)(void *))f);
// record new idle func - even if it is NULL
glut_idle_func = f;
} // glutIdleFunc
#endif // HAVE_GL
//
// End of "$Id$".
//