289 lines
9.6 KiB
C++
289 lines
9.6 KiB
C++
//
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// OpenGL test program for the Fast Light Tool Kit (FLTK).
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//
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// Modified to have 2 cubes to test multiple OpenGL contexts
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//
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// Copyright 1998-2021 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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#include <config.h>
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#include <FL/Fl.H>
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#include <FL/Fl_Window.H>
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#include <FL/Fl_Box.H>
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#include <FL/Fl_Button.H>
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#include <FL/Fl_Radio_Light_Button.H>
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#include <FL/Fl_Slider.H>
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#include <FL/Fl_Sys_Menu_Bar.H>
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#include <FL/Fl_Printer.H> // demo printing
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#include <stdlib.h>
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#if !HAVE_GL
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class cube_box : public Fl_Box {
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public:
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double lasttime;
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int wire;
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double size;
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double speed;
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cube_box(int x,int y,int w,int h,const char *l=0) :Fl_Box(FL_DOWN_BOX,x,y,w,h,l) {
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label("This demo does\nnot work without GL");
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}
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};
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#else
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#include <FL/Fl_Gl_Window.H>
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#include <FL/gl.h>
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class cube_box : public Fl_Gl_Window {
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void draw();
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int handle(int);
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public:
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double lasttime;
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int wire;
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double size;
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double speed;
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cube_box(int x,int y,int w,int h,const char *l=0) : Fl_Gl_Window(x,y,w,h,l) {
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lasttime = 0.0;
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box(FL_DOWN_FRAME);
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}
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};
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/* The cube definition */
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float v0[3] = {0.0, 0.0, 0.0};
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float v1[3] = {1.0, 0.0, 0.0};
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float v2[3] = {1.0, 1.0, 0.0};
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float v3[3] = {0.0, 1.0, 0.0};
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float v4[3] = {0.0, 0.0, 1.0};
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float v5[3] = {1.0, 0.0, 1.0};
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float v6[3] = {1.0, 1.0, 1.0};
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float v7[3] = {0.0, 1.0, 1.0};
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#define v3f(x) glVertex3fv(x)
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void drawcube(int wire) {
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/* Draw a colored cube */
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glBegin(wire ? GL_LINE_LOOP : GL_POLYGON);
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glColor3ub(0,0,255);
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v3f(v0); v3f(v1); v3f(v2); v3f(v3);
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glEnd();
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glBegin(wire ? GL_LINE_LOOP : GL_POLYGON);
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glColor3ub(0,255,255); v3f(v4); v3f(v5); v3f(v6); v3f(v7);
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glEnd();
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glBegin(wire ? GL_LINE_LOOP : GL_POLYGON);
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glColor3ub(255,0,255); v3f(v0); v3f(v1); v3f(v5); v3f(v4);
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glEnd();
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glBegin(wire ? GL_LINE_LOOP : GL_POLYGON);
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glColor3ub(255,255,0); v3f(v2); v3f(v3); v3f(v7); v3f(v6);
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glEnd();
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glBegin(wire ? GL_LINE_LOOP : GL_POLYGON);
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glColor3ub(0,255,0); v3f(v0); v3f(v4); v3f(v7); v3f(v3);
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glEnd();
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glBegin(wire ? GL_LINE_LOOP : GL_POLYGON);
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glColor3ub(255,0,0); v3f(v1); v3f(v2); v3f(v6); v3f(v5);
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glEnd();
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}
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void cube_box::draw() {
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lasttime = lasttime+speed;
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if (!valid()) {
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glLoadIdentity();
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glViewport(0,0,pixel_w(),pixel_h());
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glEnable(GL_DEPTH_TEST);
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glFrustum(-1,1,-1,1,2,10000);
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glTranslatef(0,0,-10);
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glClearColor(0.4f, 0.4f, 0.4f, 0);
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}
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glPushMatrix();
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glRotatef(float(lasttime*1.6),0,0,1);
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glRotatef(float(lasttime*4.2),1,0,0);
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glRotatef(float(lasttime*2.3),0,1,0);
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glTranslatef(-1.0f, 1.2f, -1.5f);
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glScalef(float(size),float(size),float(size));
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drawcube(wire);
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glPopMatrix();
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gl_color(FL_GRAY);
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glDisable(GL_DEPTH_TEST);
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gl_font(FL_HELVETICA_BOLD, 16 );
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gl_draw(wire ? "Cube: wire" : "Cube: flat", -4.5f, -4.5f );
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glEnable(GL_DEPTH_TEST);
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// if an OpenGL graphics driver is installed, give it a chance
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// to draw additional graphics
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#if HAVE_GL
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Fl_Gl_Window::draw();
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#endif
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}
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int cube_box::handle(int e) {
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switch (e) {
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case FL_ENTER: cursor(FL_CURSOR_CROSS); break;
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case FL_LEAVE: cursor(FL_CURSOR_DEFAULT); break;
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}
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return Fl_Gl_Window::handle(e);
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}
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#endif
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Fl_Window *form;
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Fl_Slider *speed, *size;
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Fl_Button *exit_button, *wire, *flat;
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cube_box *lt_cube, *rt_cube;
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int done = 0; // set to 1 in exit button callback
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// exit button callback
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void exit_cb(Fl_Widget *, void *) {
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done = 1;
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}
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// print screen demo
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void print_cb(Fl_Widget *w, void *data)
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{
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Fl_Printer printer;
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Fl_Window *win = Fl::first_window();
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if(!win) return;
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if( printer.start_job(1) ) return;
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if( printer.start_page() ) return;
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printer.scale(0.5,0.5);
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printer.print_widget( win );
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printer.end_page();
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printer.end_job();
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}
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// Create a form that allows resizing for A and C (GL windows) with B fixed size/centered:
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//
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// lt_grp rt_grp
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// |<--------------------------------------->|<---------------------->|
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// . lt_cube ct_grp : rt_cube .
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// . 350 100 : 350 .
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// . |<------------------->| |<-------->| |<------------------->| .
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// ....................................................................
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// : ....................... ............ ....................... :
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// : : : : : : : :
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// : : A : : B : : C : :
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// : : : : : : : :
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// : :.....................: :..........: :.....................: : __
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// :..................................................................: __ MARGIN
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//
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// | |
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// MARGIN
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//
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#define MENUBAR_H 25 // menubar height
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#define MARGIN 20 // fixed margin around widgets
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#define MARGIN2 (MARGIN*2)
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#define MARGIN3 (MARGIN*3)
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void makeform(const char *name) {
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// Widget's XYWH's
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int form_w = 800 + 4 * MARGIN; // main window width
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int form_h = 350 + MENUBAR_H + 2 * MARGIN; // main window height
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int me_bar_x=0, me_bar_y=0, me_bar_w=form_w, me_bar_h=MENUBAR_H; // menubar
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int lt_grp_x=0, lt_grp_y=MENUBAR_H+MARGIN, lt_grp_w=350+100+MARGIN3, lt_grp_h=form_h-MENUBAR_H-MARGIN2; // left group
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int lt_cub_x=lt_grp_x+MARGIN, lt_cub_y=lt_grp_y, lt_cub_w=350, lt_cub_h=lt_grp_h; // left cube box (GL)
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int ct_grp_x=lt_grp_x+350+MARGIN2, ct_grp_y=lt_grp_y, ct_grp_w=100, ct_grp_h=lt_grp_h; // center group
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int rt_grp_x=lt_grp_x+lt_grp_w, rt_grp_y=lt_grp_y, rt_grp_w=350+MARGIN, rt_grp_h=lt_grp_h; // right group
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int rt_cub_x=rt_grp_x, rt_cub_y=lt_grp_y, rt_cub_w=350, rt_cub_h=lt_grp_h; // right cube box (GL)
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// main window
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form = new Fl_Window(form_w, form_h, name);
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form->begin();
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// menu bar
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Fl_Sys_Menu_Bar *menubar = new Fl_Sys_Menu_Bar(me_bar_x, me_bar_y, me_bar_w, me_bar_h);
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menubar->add("File/Print window", FL_COMMAND+'p', print_cb);
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menubar->add("File/Quit", FL_COMMAND+'q', exit_cb);
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// left group
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Fl_Group *lt_grp = new Fl_Group(lt_grp_x, lt_grp_y, lt_grp_w, lt_grp_h);
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lt_grp->begin();
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// left GL window
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lt_cube = new cube_box(lt_cub_x, lt_cub_y, lt_cub_w, lt_cub_h, 0);
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// center group
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Fl_Group *ct_grp = new Fl_Group(ct_grp_x, ct_grp_y, ct_grp_w, ct_grp_h);
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ct_grp->begin();
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wire = new Fl_Radio_Light_Button(ct_grp_x, ct_grp_y, 100, 25, "Wire");
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flat = new Fl_Radio_Light_Button(ct_grp_x, wire->y()+wire->h(), 100, 25, "Flat");
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speed = new Fl_Slider(FL_VERT_SLIDER, ct_grp_x, flat->y()+flat->h()+MARGIN, 40, 200, "Speed");
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size = new Fl_Slider(FL_VERT_SLIDER, ct_grp_x+40+MARGIN, flat->y()+flat->h()+MARGIN, 40, 200, "Size");
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exit_button = new Fl_Button(ct_grp_x, form_h-MARGIN-25, 100, 25, "Exit");
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exit_button->callback(exit_cb);
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ct_grp->end();
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ct_grp->resizable(speed); // only sliders resize vertically, not buttons
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lt_grp->end();
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lt_grp->resizable(lt_cube);
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// right group
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Fl_Group *rt_grp = new Fl_Group(rt_grp_x, rt_grp_y, rt_grp_w, rt_grp_h);
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rt_grp->begin();
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// right GL window
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rt_cube = new cube_box(rt_cub_x, rt_cub_y, rt_cub_w, rt_cub_h, 0);
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rt_grp->end();
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rt_grp->resizable(rt_cube);
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// right resizer
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Fl_Box *rt_resizer = new Fl_Box(rt_grp_x-5, rt_grp_y, 10, rt_grp_h);
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rt_resizer->box(FL_NO_BOX);
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#if HAVE_GL
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// overlay a button onto an OpenGL window
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lt_cube->begin();
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Fl_Button *test = new Fl_Button(35, 105, 100, 30, "Test");
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test->box(FL_ROUND_UP_BOX);
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lt_cube->end();
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#endif // HAVE_GL
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form->end();
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form->resizable(rt_resizer);
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form->size_range(form->w(), form->h()); // minimum window size
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}
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int main(int argc, char **argv) {
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Fl::use_high_res_GL(1);
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makeform(argv[0]);
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speed->bounds(4,0);
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#if HAVE_GL
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speed->value(lt_cube->speed = rt_cube->speed = 1.0);
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#else
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speed->value(lt_cube->speed = rt_cube->speed = 0.0);
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#endif
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size->bounds(4,0.01);
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size->value(lt_cube->size = rt_cube->size = 1.0);
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flat->value(1); lt_cube->wire = 0; rt_cube->wire = 1;
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form->label("cube");
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form->show(argc,argv);
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lt_cube->show();
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rt_cube->show();
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#if 0
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// This demonstrates how to manipulate OpenGL contexts.
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// In this case the same context is used by multiple windows (I'm not
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// sure if this is allowed on Win32, can somebody check?).
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// This fixes a bug on the XFree86 3.0 OpenGL where only one context
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// per program seems to work, but there are probably better uses for
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// this!
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lt_cube->make_current(); // causes context to be created
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rt_cube->context(lt_cube->context()); // share the contexts
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#endif
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for (;;) {
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if (form->visible() && speed->value()) {
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if (!Fl::check()) break; // returns immediately
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} else {
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if (!Fl::wait()) break; // waits until something happens
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}
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lt_cube->wire = wire->value();
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rt_cube->wire = !wire->value();
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lt_cube->size = rt_cube->size = size->value();
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lt_cube->speed = rt_cube->speed = speed->value();
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lt_cube->redraw();
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rt_cube->redraw();
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if (done) break; // exit button was clicked
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}
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return 0;
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}
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