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boinc/api/x_opengl.cpp

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// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
#include "config.h"
#include <cstdlib>
#include <cstdio>
#include <csetjmp>
#include <unistd.h>
#include <pthread.h>
#include <cstring>
#include <csignal>
#include "x_opengl.h"
#include "app_ipc.h"
#include "util.h"
#include "filesys.h"
#include "unix_util.h"
#include "boinc_gl.h"
#include "boinc_glut.h"
#include "graphics_api.h"
#include "graphics_impl.h"
#define BOINC_WINDOW_CLASS_NAME "BOINC_app"
#define TIMER_INTERVAL_MSEC 30
#define TIMER_INTERVAL_SUSPENDED_MSEC 1000
static bool visible = true;
static int current_graphics_mode = MODE_HIDE_GRAPHICS;
static int acked_graphics_mode;
static int xpos = 100, ypos = 100;
static int win_width = 600, win_height = 400;
static int clicked_button;
static int win=0;
static bool glut_is_initialized = false;
static bool suspend_render = false;
// freeglut extensions, not in GL/glut.h.
//
// glutGet(GLUT_VERSION) returns the freeglut version.
// returns (major*10000)+(minor*100)+maint level
// NOTE - make sure freeglut is initialized before
// getting the version.
// NOTE - this isn't valid in GLUT which makes it doubly
// useful, the -1 return code says its _not_
// running freeglut so makes for a useful way
// we can tell at runtime which library
// is in use.
//
#ifndef GLUT_VERSION
#define GLUT_VERSION 0x01FC
#endif
// glutGet(GLUT_INIT_STATE) returns freegluts state. Determines
// when to call glutInit again to reinitialize it.
//
#ifndef GLUT_INIT_STATE
#define GLUT_INIT_STATE 0x007C
#endif
// Simple defines for checking freeglut states
//
// Check whether freeglut is initialized. Necessary
// since it deinitializes itself when the window is
// closed. Only works with freeglut, although glut
// will return -1 and write a warning message to stdout
//
#define FREEGLUT_IS_INITIALIZED ((bool)(glutGet(GLUT_INIT_STATE)==1))
// Check whether a window exists. Necessary as glutDestroyWindow
// causes SIGABRT, so we hide and reshow windows instead
// of creating and deleting them. (Talking freeglut here)
// note - make sure glutInit is called before checking,
// otherwise freeglut will SIGABRT.
//
#define GLUT_HAVE_WINDOW ((bool)(glutGetWindow()!=0))
// Runtime tag to tell we're using freeglut so can take precautions
// and avoid SIGABRTs. Initialize the flag to 'true' and the
// init code in boinc_glut_init() will check whether we have
// openglut or freeglut, resetting the variable as necessary.
//
// Linux systems ship with freeglut, so default is 'true' and
// its checked.
//
// If running freeglut, also get the version.
//
#ifdef __APPLE__
static bool glut_is_freeglut = false; // Avoid warning message to stderr from glutGet(GLUT_VERSION)
static bool need_show = false;
#else
static bool glut_is_freeglut = true;
#endif
static int glut_version = 0;
// State variables for freeglut windows. Since freeglut has
// problems wiht glutDestroyWindow, keep it open and just
// hide/show it as necessary.
//
static int fg_window_state; // values same as mode
static bool fg_window_is_fullscreen;
static jmp_buf jbuf; // longjump/setjump for exit/signal handler
static struct sigaction original_signal_handler; // store previous ABRT signal-handler
static void set_mode(int mode);
static void restart(void);
static void boinc_glut_init(void);
static APP_INIT_DATA aid;
extern pthread_t graphics_thread; // thread info
extern pthread_t worker_thread;
// possible longjmp-values to signal from where we jumped:
//
enum {
JUMP_NONE = 0,
JUMP_EXIT,
JUMP_ABORT,
JUMP_LAST
};
// 1= exit caught by atexit, 2 = signal caught by handler
int xwin_glut_is_initialized() {
return glut_is_initialized;
}
bool debug = false;
// This callback is invoked when a user presses a key.
//
void keyboardD(unsigned char key, int /*x*/, int /*y*/) {
if (current_graphics_mode == MODE_FULLSCREEN) {
set_mode(MODE_HIDE_GRAPHICS);
} else {
boinc_app_key_press((int) key, 0);
}
}
void keyboardU(unsigned char key, int /*x*/, int /*y*/) {
if (current_graphics_mode == MODE_FULLSCREEN) {
set_mode(MODE_HIDE_GRAPHICS);
} else {
boinc_app_key_release((int) key, 0);
}
}
void mouse_click(int button, int state, int x, int y){
clicked_button = button;
if (current_graphics_mode == MODE_FULLSCREEN) {
set_mode(MODE_HIDE_GRAPHICS);
} else {
if (state) {
boinc_app_mouse_button(x, y, button, false);
} else {
boinc_app_mouse_button(x, y, button, true);
}
}
}
void mouse_click_move(int x, int y){
if (current_graphics_mode == MODE_FULLSCREEN){
set_mode(MODE_HIDE_GRAPHICS);
} else if (clicked_button == 2){
boinc_app_mouse_move(x, y, false, false, true);
} else if (clicked_button == 1){
boinc_app_mouse_move(x, y, false, true, false);
} else if (clicked_button == 0){
boinc_app_mouse_move(x, y, true, false, false);
} else{
boinc_app_mouse_move(x, y, false, false, false);
}
}
// maybe_render() can be called directly by GLUT when a window is
// uncovered, so we let that happen even if suspend_render is true.
static void maybe_render() {
int width, height;
BOINC_STATUS boinc_status;
if (visible && (current_graphics_mode != MODE_HIDE_GRAPHICS)) {
width = glutGet(GLUT_WINDOW_WIDTH);
height = glutGet(GLUT_WINDOW_HEIGHT);
if (throttled_app_render(width, height, dtime())) {
glutSwapBuffers();
#ifdef __APPLE__
switch (current_graphics_mode) {
case MODE_WINDOW:
MacGLUTFix(false);
if (need_show) {
glutShowWindow();
need_show = false;
}
break;
case MODE_FULLSCREEN:
case MODE_BLANKSCREEN:
MacGLUTFix(true);
if (need_show) {
glutShowWindow();
need_show = false;
}
break;
}
#endif
// Always render once after app is suspended in case app displays
// different graphics when suspended, then stop rendering
boinc_get_status(&boinc_status);
if (boinc_status.suspended)
suspend_render = true;
}
}
}
void CloseWindow() {
set_mode(MODE_HIDE_GRAPHICS);
}
static void make_new_window(int mode) {
if ( (mode != MODE_WINDOW) && (mode != MODE_FULLSCREEN) ) {
// nothing to be done here
return;
}
if (glut_is_initialized && glut_is_freeglut) {
if (!FREEGLUT_IS_INITIALIZED) {
glut_is_initialized = false;
fg_window_is_fullscreen = false;
fg_window_state = 0;
}
}
if (!glut_is_initialized) {
boinc_glut_init();
}
if (debug) fprintf(stderr, "make_new_window(): now calling glutCreateWindow(%s)...\n", aid.app_name);
char window_title[256];
get_window_title(aid, window_title, 256);
// just show the window if its hidden
// if it used to be fullscreen (before
// it was hidden, reset size and position
// to defaults
//
bool have_window = false;
if (glut_is_freeglut && GLUT_HAVE_WINDOW) {
have_window = true;
glutShowWindow();
if (fg_window_is_fullscreen) {
glutPositionWindow(xpos, ypos);
glutReshapeWindow(600, 400);
fg_window_is_fullscreen = false;
}
fg_window_state = MODE_WINDOW;
}
#ifdef __APPLE__
if (win)
have_window = true;
#endif
if (!have_window) {
win = glutCreateWindow(window_title);
if (debug) fprintf(stderr, "glutCreateWindow() succeeded. win = %d\n", win);
glutReshapeFunc(app_graphics_resize);
glutKeyboardFunc(keyboardD);
glutKeyboardUpFunc(keyboardU);
glutMouseFunc(mouse_click);
glutMotionFunc(mouse_click_move);
glutDisplayFunc(maybe_render);
glEnable(GL_DEPTH_TEST);
app_graphics_init();
}
#ifdef __APPLE__
glutWMCloseFunc(CloseWindow); // Enable the window's close box
BringAppToFront();
// Show window only after a successful call to throttled_app_render();
// this avoids momentary display of old image when screensaver restarts
// which made image appear to "jump."
need_show = true;
#endif
if (mode == MODE_FULLSCREEN) {
glutFullScreen();
}
return;
}
// Initialize GLUT.
// Using GLUT, this should only called once,
// even if the window is closed and opened.
// Using freeGLUT, its called to reinit freeglut and
// the graphics window as freeglut 'deinitialized' itself
// when the window is destroyed
//
// note - this is called from make_new_window() when a new
// window is to be created.
//
static void boinc_glut_init() {
const char* args[2] = {"screensaver", NULL};
int one=1;
static bool first = true;
win = 0;
if (debug) fprintf(stderr, "Calling glutInit()... \n");
glutInit (&one, (char**)args);
if (debug) fprintf(stderr, "survived glutInit(). \n");
// figure out whether we're running GLUT or freeglut.
//
// note - glutGet(GLUT_VERSION) is supported in freeglut,
// other GLUT returns -1 and outputs a warning
// message to stderr.
// - must be after glutInit or will get SIGABRT
//
if (first) {
first = false;
if (glut_is_freeglut) {
glut_version = glutGet(GLUT_VERSION);
if (glut_version == -1) {
glut_version = 0;
glut_is_freeglut = false;
} else {
int major = glut_version/10000;
int minor = (glut_version -(major*10000))/100;
int maint = glut_version - (major*10000) - (minor * 100);
if (debug) fprintf(stderr, "Running freeGLUT %d.%d.%d.\n", major, minor, maint);
}
}
}
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowPosition(xpos, ypos);
glutInitWindowSize(600, 400);
g_bmsp->boinc_get_init_data_hook(aid);
if (!strlen(aid.app_name)) {
strcpy(aid.app_name, "BOINC Application");
}
glut_is_initialized = true;
if (glut_is_freeglut) {
fg_window_state = 0;
}
return;
}
// Destroy current window if any
//
// Note - glutDestroyWindow results in SIGABRT in freeglut, so
// instead of closing the window, just hide it. And
// before hiding it, make sure there is a window,
// user could have closed it.
//
void KillWindow() {
if (win) {
#ifdef __APPLE__
if (current_graphics_mode == MODE_WINDOW) {
win_width = glutGet(GLUT_WINDOW_WIDTH);
win_height = glutGet(GLUT_WINDOW_HEIGHT);
xpos = glutGet(GLUT_WINDOW_X);
ypos = glutGet(GLUT_WINDOW_Y);
} else {
// If fullscreen, resize now to avoid ugly flash if we subsequently
// redisplay as MODE_WINDOW.
glutPositionWindow(xpos, ypos);
glutReshapeWindow(win_width, win_height);
}
// On Intel Macs (but not on PowerPC Macs) GLUT's destuctors often crash when
// glutDestroyWindow() is called. So far, this has only been reported for
// SETI@home. Since it doesn't occur on PowerPC Macs, we suspect a bug in GLUT.
// To work around this, we just hide the window instead. Though this does not
// free up RAM and VM used by the graphics, glutDestroyWindow() doesn't free
// them either (surprisingly), so there is no additional penalty for doing it
// this way.
glutHideWindow();
#else
if (glut_is_freeglut && FREEGLUT_IS_INITIALIZED && GLUT_HAVE_WINDOW) {
glutHideWindow();
} else {
int oldwin = win;
win = 0; // set this to 0 FIRST to avoid recursion if the following call fails.
glutDestroyWindow(oldwin);
}
#endif
}
}
void set_mode(int mode) {
if (mode == current_graphics_mode) {
// Bring graphics window to front whenever user presses "Show graphics"
if (mode == MODE_WINDOW) {
#ifdef __APPLE__
BringAppToFront();
#else
if (glut_is_freeglut && FREEGLUT_IS_INITIALIZED && (GLUT_HAVE_WINDOW > 0)) {
// glutPopWindow();
glutShowWindow();
}
#endif
}
return;
}
if (debug) fprintf(stderr, "set_mode(%d): current_mode = %d.\n", mode, current_graphics_mode);
if (glut_is_initialized) {
if (debug) fprintf(stderr, "Calling KillWindow(): win = %d\n", win);
KillWindow();
if (debug) fprintf(stderr, "KillWindow() survived.\n");
}
if (mode != MODE_HIDE_GRAPHICS) {
if (debug) fprintf(stderr, "set_mode(): Calling make_new_window(%d)\n", mode);
make_new_window(mode);
if (debug) fprintf(stderr, "make_new_window() survived.\n");
}
#ifdef __APPLE__
else
HideThisApp();
#endif
current_graphics_mode = mode;
return;
}
static void wait_for_initial_message() {
(*g_bmsp->app_client_shmp)->shm->graphics_reply.send_msg(
xml_graphics_modes[MODE_HIDE_GRAPHICS]
);
acked_graphics_mode = MODE_HIDE_GRAPHICS;
while (1) {
if ((*g_bmsp->app_client_shmp)->shm->graphics_request.has_msg()) {
break;
}
sleep(1);
}
return;
}
static void timer_handler(int) {
char buf[MSG_CHANNEL_SIZE];
GRAPHICS_MSG m;
BOINC_STATUS boinc_status;
if (*g_bmsp->app_client_shmp) {
if ((*g_bmsp->app_client_shmp)->shm->graphics_request.get_msg(buf)) {
(*g_bmsp->app_client_shmp)->decode_graphics_msg(buf, m);
switch (m.mode) {
case MODE_REREAD_PREFS:
//only reread graphics prefs if we have a window open
//
switch (current_graphics_mode){
case MODE_WINDOW:
case MODE_FULLSCREEN:
app_graphics_reread_prefs();
break;
}
break;
case MODE_HIDE_GRAPHICS:
case MODE_WINDOW:
case MODE_FULLSCREEN:
case MODE_BLANKSCREEN:
if (strlen(m.display)) {
setenv("DISPLAY",m.display,1);
}
set_mode(m.mode);
break;
}
}
if (acked_graphics_mode != current_graphics_mode) {
bool sent = (*g_bmsp->app_client_shmp)->shm->graphics_reply.send_msg(
xml_graphics_modes[current_graphics_mode]
);
if (sent) acked_graphics_mode = current_graphics_mode;
}
}
boinc_get_status(&boinc_status);
if (! boinc_status.suspended)
suspend_render = false;
if (suspend_render) {
glutTimerFunc(TIMER_INTERVAL_SUSPENDED_MSEC, timer_handler, 0);
} else {
maybe_render();
glutTimerFunc(TIMER_INTERVAL_MSEC, timer_handler, 0);
}
return;
}
// exit handler: really only meant to handle exits() called by GLUT...
//
void restart() {
// don't do anything except when exit is called from the graphics-thread
if (!pthread_equal(pthread_self(), graphics_thread)) {
if (debug) fprintf(stderr, "exit() was called from worker-thread\n");
return;
}
if (debug) fprintf(stderr, "restart: exit() called from graphics-thread.\n");
// if we are standalone and glut was initialized,
// we assume user pressed 'close', and we exit the app
//
//
if (glut_is_initialized ) {
if (boinc_is_standalone()) {
if (debug) fprintf(stderr,
"Assuming user pressed 'close'... means we're exiting now.\n"
);
if (boinc_delete_file(LOCKFILE) != 0) {
perror ("Failed to remove lockfile..\n");
}
return;
}
}
// re-install the exit-handler to catch glut's notorious exits()...
//
atexit(restart);
// jump back to entry-point in xwin_graphics_event_loop();
//
if (debug) fprintf(stderr, "restart: Jumping back to event_loop.\n");
longjmp(jbuf, JUMP_EXIT);
}
// deal with ABORT's, typically raised by GLUT
// If we are in the graphics thread, we just return back
// into xwin_graphics_event_loop. If we are in the main thread, then
// restore the old signal handler and raise SIGABORT.
//
void restart_sig(int /*signal_number*/) {
if (pthread_equal(pthread_self(), graphics_thread)) {
// alternative approach is for the signal hander to call exit().
fprintf(stderr, "Caught SIGABRT in graphics thread\n");
if (debug) fprintf(stderr, "Caught SIGABRT in graphics thread. Jumping back to xwin_graphics_event_loop()...\n");
// jump back to entry-point in xwin_graphics_event_loop()
longjmp(jbuf, JUMP_ABORT);
} else {
// In non-graphics thread: use original signal handler
//
fprintf(stderr, "Caught SIGABRT in non-graphics thread\n");
if (debug) fprintf(stderr, "Caught SIGABRT in non-graphics thread. Trying to call previous ABRT-handler...\n");
if (sigaction(SIGABRT, &original_signal_handler, NULL)) {
perror("Unable to restore SIGABRT signal handler in non-graphics thread\n");
// what to do? call abort(3)?? call exit(nonzero)???
// Here we just return.
} else {
// we could conceivably try to call the old signal handler
// directly. But this means checking how its flags/masks
// are set, making sure it's not NULL (for no action) and so
// on. This seems simpler and more robust. On the other
// hand it may take some time for the signal to be
// delivered, and during that time, what's going to be
// executing?
raise(SIGABRT);
}
}
}
// graphics thread main-function
// NOTE: this should only be called *ONCE* by an application
//
void xwin_graphics_event_loop() {
int restarted = 0;
if (debug) fprintf(stderr, "Direct call to xwin_graphics_event_loop()\n");
struct sigaction sa = {0};
memset(&sa, 0, sizeof(sa));
sa.sa_handler = restart_sig;
sa.sa_flags = SA_RESTART;
// install signal handler to catch abort() from GLUT. Note that
// signal handlers are global to ALL threads, so the signal
// handler that we record here in &original_signal_handler is the
// previous one that applied to BOTH threads
if (sigaction(SIGABRT, &sa, &original_signal_handler)) {
perror("unable to install signal handler to catch SIGABORT");
}
// handle glut's notorious exits()..
atexit(restart);
// THIS IS THE re-entry point at exit or ABORT in the graphics-thread
restarted = setjmp(jbuf);
// if we came here from an ABORT-signal thrown in this thread,
// we put this thread to sleep
//
if (restarted == JUMP_ABORT) {
while(1) {
sleep(1);
}
}
// If using freeglut, check to see if we need to
// reinitialize glut and graphics.
// We're only resetting flags here, actual reinit function
// is called in make_new_window().
//
if (glut_is_initialized && glut_is_freeglut) {
if (1 == (glut_is_initialized = FREEGLUT_IS_INITIALIZED)) {
if (!GLUT_HAVE_WINDOW) {
win = 0;
}
}
}
if (boinc_is_standalone()) {
if (restarted) {
while(1) {
sleep(1); // assuming glutInit() failed: put graphics-thread to sleep
}
} else {
// open the graphics-window
set_mode(MODE_WINDOW);
glutTimerFunc(TIMER_INTERVAL_MSEC, timer_handler, 0);
}
} else {
if (!glut_is_initialized) {
#ifdef __APPLE__
setMacPList();
#endif
set_mode(MODE_HIDE_GRAPHICS);
while ( current_graphics_mode == MODE_HIDE_GRAPHICS ) {
if (debug) fprintf(stderr,
"Graphics-thread now waiting for client-message...\n"
);
wait_for_initial_message();
if (debug) fprintf(stderr, "got a graphics-message from client... \n");
timer_handler(0);
}
} else
// here glut has been initialized previously
// probably the user pressed window-'close'
//
set_mode(MODE_HIDE_GRAPHICS); // close any previously open windows
}
// ok we should be ready & initialized by now to call glutMainLoop()
//
if (debug) fprintf(stderr, "now calling glutMainLoop()...\n");
glutMainLoop();
if (debug) fprintf(stderr, "glutMainLoop() returned!! This should never happen...\n");
}
const char *BOINC_RCSID_c457a14644 = "$Id$";
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