f3a84c0ee5
All changes are mac-specific, except a very minor change in file src/gl_draw.cxx where string drawing wrongly claimed to support @symbol, not possible because symbols are drawn using non-GL primitives. Unchanged application code can use the new FLTK code. In addition, the new code allows mac applications to draw OpenGL scenes at high resolution on so-called 'retina' displays, but this requires some support from app code. They must call, before opening GL windows, Fl::use_high_resolution(1); and change their glViewport() calls as follows glViewport(0, 0, pxel_w(), pixel_h()); This uses 2 new member functions of the Fl_Gl_Window class, pixel_w() and pixel_h() returning the window dimensions in pixel units, that is, twice the w() and h() when the window is mapped on a retina display. git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10498 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
150 lines
3.5 KiB
C++
150 lines
3.5 KiB
C++
//
|
|
// "$Id$"
|
|
//
|
|
// OpenGL overlay test program for the Fast Light Tool Kit (FLTK).
|
|
//
|
|
// Copyright 1998-2010 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
|
|
//
|
|
|
|
#include <config.h>
|
|
#include <FL/Fl.H>
|
|
#include <FL/Fl_Window.H>
|
|
#include <FL/Fl_Hor_Slider.H>
|
|
#include <FL/Fl_Toggle_Button.H>
|
|
#include <FL/math.h>
|
|
|
|
#if !HAVE_GL
|
|
#include <FL/Fl_Box.H>
|
|
class shape_window : public Fl_Box {
|
|
public:
|
|
int sides;
|
|
shape_window(int x,int y,int w,int h,const char *l=0)
|
|
:Fl_Box(FL_DOWN_BOX,x,y,w,h,l){
|
|
label("This demo does\nnot work without GL");
|
|
}
|
|
};
|
|
#else
|
|
#include <FL/gl.h>
|
|
#include <FL/Fl_Gl_Window.H>
|
|
|
|
class shape_window : public Fl_Gl_Window {
|
|
void draw();
|
|
void draw_overlay();
|
|
public:
|
|
int sides;
|
|
int overlay_sides;
|
|
shape_window(int x,int y,int w,int h,const char *l=0);
|
|
};
|
|
|
|
shape_window::shape_window(int x,int y,int w,int h,const char *l) :
|
|
Fl_Gl_Window(x,y,w,h,l) {
|
|
sides = overlay_sides = 3;
|
|
}
|
|
|
|
void shape_window::draw() {
|
|
// the valid() property may be used to avoid reinitializing your
|
|
// GL transformation for each redraw:
|
|
if (!valid()) {
|
|
valid(1);
|
|
glLoadIdentity();
|
|
glViewport(0,0,pixel_w(),pixel_h());
|
|
}
|
|
// draw an amazing but slow graphic:
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
// for (int j=1; j<=1000; j++) {
|
|
glBegin(GL_POLYGON);
|
|
for (int j=0; j<sides; j++) {
|
|
double ang = j*2*M_PI/sides;
|
|
glColor3f(float(j)/sides,float(j)/sides,float(j)/sides);
|
|
glVertex3f(cos(ang),sin(ang),0);
|
|
}
|
|
glEnd();
|
|
// }
|
|
}
|
|
|
|
void shape_window::draw_overlay() {
|
|
// the valid() property may be used to avoid reinitializing your
|
|
// GL transformation for each redraw:
|
|
if (!valid()) {
|
|
valid(1);
|
|
glLoadIdentity();
|
|
glViewport(0,0,pixel_w(),pixel_h());
|
|
}
|
|
// draw an amazing graphic:
|
|
gl_color(FL_RED);
|
|
glBegin(GL_LINE_LOOP);
|
|
for (int j=0; j<overlay_sides; j++) {
|
|
double ang = j*2*M_PI/overlay_sides;
|
|
glVertex3f(cos(ang),sin(ang),0);
|
|
}
|
|
glEnd();
|
|
}
|
|
#endif
|
|
|
|
// when you change the data, as in this callback, you must call redraw():
|
|
void sides_cb(Fl_Widget *o, void *p) {
|
|
shape_window *sw = (shape_window *)p;
|
|
sw->sides = int(((Fl_Slider *)o)->value());
|
|
sw->redraw();
|
|
}
|
|
|
|
#if HAVE_GL
|
|
void overlay_sides_cb(Fl_Widget *o, void *p) {
|
|
shape_window *sw = (shape_window *)p;
|
|
sw->overlay_sides = int(((Fl_Slider *)o)->value());
|
|
sw->redraw_overlay();
|
|
}
|
|
#endif
|
|
#include <stdio.h>
|
|
int main(int argc, char **argv) {
|
|
|
|
Fl::use_high_res_GL(1);
|
|
Fl_Window window(300, 370);
|
|
|
|
shape_window sw(10, 75, window.w()-20, window.h()-90);
|
|
//sw.mode(FL_RGB);
|
|
window.resizable(&sw);
|
|
|
|
Fl_Hor_Slider slider(60, 5, window.w()-70, 30, "Sides:");
|
|
slider.align(FL_ALIGN_LEFT);
|
|
slider.callback(sides_cb,&sw);
|
|
slider.value(sw.sides);
|
|
slider.step(1);
|
|
slider.bounds(3,40);
|
|
|
|
Fl_Hor_Slider oslider(60, 40, window.w()-70, 30, "Overlay:");
|
|
oslider.align(FL_ALIGN_LEFT);
|
|
#if HAVE_GL
|
|
oslider.callback(overlay_sides_cb,&sw);
|
|
oslider.value(sw.overlay_sides);
|
|
#endif
|
|
oslider.step(1);
|
|
oslider.bounds(3,40);
|
|
|
|
window.end();
|
|
window.show(argc,argv);
|
|
#if HAVE_GL
|
|
printf("Can do overlay = %d\n", sw.can_do_overlay());
|
|
sw.show();
|
|
sw.redraw_overlay();
|
|
#else
|
|
sw.show();
|
|
#endif
|
|
|
|
return Fl::run();
|
|
}
|
|
|
|
//
|
|
// End of "$Id$".
|
|
//
|