X11 implementation
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Pierre Krieger
parent
bf2773c233
commit
4028b925d3
3 changed files with 595 additions and 0 deletions
336
src/x11/mod.rs
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336
src/x11/mod.rs
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@ -0,0 +1,336 @@
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use {Event, Hints};
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use libc;
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use std::{mem, ptr};
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mod ffi;
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pub struct Window {
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display: *mut ffi::Display,
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window: ffi::Window,
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context: ffi::GLXContext,
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}
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impl Window {
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pub fn new(dimensions: Option<(uint, uint)>, title: &str, hints: &Hints)
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-> Result<Window, String>
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{
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// calling XOpenDisplay
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let display = unsafe {
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let display = ffi::XOpenDisplay(ptr::null());
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if display.is_null() {
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return Err(format!("XOpenDisplay failed"));
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}
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display
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};
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// TODO: set error handler
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static VISUAL_ATTRIBUTES: [libc::c_int, ..5] = [
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ffi::GLX_RGBA,
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ffi::GLX_DEPTH_SIZE,
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24,
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ffi::GLX_DOUBLEBUFFER,
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0
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];
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// getting the visual infos
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let visual_infos = unsafe {
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let vi = ffi::glXChooseVisual(display, 0, VISUAL_ATTRIBUTES.as_ptr());
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if vi.is_null() {
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return Err(format!("glXChooseVisual failed"));
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}
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vi
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};
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// getting the root window
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let root = unsafe { ffi::XDefaultRootWindow(display) };
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// creating the color map
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let cmap = unsafe {
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let cmap = ffi::XCreateColormap(display, root,
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(*visual_infos).visual, ffi::AllocNone);
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// TODO: error checking?
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cmap
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};
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// creating
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let mut set_win_attr = {
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let mut swa: ffi::XSetWindowAttributes = unsafe { mem::zeroed() };
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swa.colormap = cmap;
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//swa.event_mask = ExposureMask | KeyPressMask;
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swa
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};
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// finally creating the window
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let window = unsafe {
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let win = ffi::XCreateWindow(display, root, 10, 10, 800, 600,
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0, (*visual_infos).depth, ffi::InputOutput, (*visual_infos).visual,
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ffi::CWColormap/* | ffi::CWEventMask*/, &mut set_win_attr);
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win
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};
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// showing window
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unsafe { ffi::XMapWindow(display, window) };
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unsafe { ffi::XStoreName(display, window, mem::transmute(title.as_slice().as_ptr())); }
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unsafe { ffi::XFlush(display); }
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// creating GL context
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let context = unsafe {
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ffi::glXCreateContext(display, visual_infos, ptr::null(), 1)
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};
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// returning
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Ok(Window{
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display: display,
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window: window,
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context: context,
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})
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}
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pub fn should_close(&self) -> bool {
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// TODO:
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false
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}
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pub fn set_title(&self, title: &str) {
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unsafe {
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ffi::XStoreName(self.display, self.window,
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mem::transmute(title.as_slice().as_ptr()));
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}
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}
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pub fn get_position(&self) -> (uint, uint) {
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unimplemented!()
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}
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pub fn set_position(&self, x: uint, y: uint) {
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unimplemented!()
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}
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pub fn get_size(&self) -> (uint, uint) {
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unimplemented!()
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}
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pub fn set_size(&self, x: uint, y: uint) {
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unimplemented!()
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}
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pub fn poll_events(&self) -> Vec<Event> {
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unimplemented!()
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}
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pub fn wait_events(&self) -> Vec<Event> {
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// TODO:
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Vec::new()
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}
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pub fn make_current(&self) {
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let res = unsafe { ffi::glXMakeCurrent(self.display, self.window, self.context) };
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if res == 0 {
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fail!("glXMakeCurrent failed");
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}
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}
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pub fn get_proc_address(&self, addr: &str) -> *const () {
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use std::c_str::ToCStr;
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use std::mem;
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unsafe {
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addr.with_c_str(|s| {
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let p = ffi::glXGetProcAddress(mem::transmute(s)) as *const ();
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if !p.is_null() { return p; }
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println!("{}", p);
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p
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})
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}
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}
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pub fn swap_buffers(&self) {
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unsafe { ffi::glXSwapBuffers(self.display, self.window) }
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}
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}
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impl Drop for Window {
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fn drop(&mut self) {
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unsafe { ffi::XCloseDisplay(self.display) }
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}
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}
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/*
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printf( "Getting matching framebuffer configs\n" );
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int fbcount;
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GLXFBConfig* fbc = glXChooseFBConfig(display, DefaultScreen(display), visual_attribs, &fbcount);
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if (!fbc)
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{
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printf( "Failed to retrieve a framebuffer config\n" );
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exit(1);
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}
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printf( "Found %d matching FB configs.\n", fbcount );
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// Pick the FB config/visual with the most samples per pixel
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printf( "Getting XVisualInfos\n" );
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int best_fbc = -1, worst_fbc = -1, best_num_samp = -1, worst_num_samp = 999;
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int i;
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for (i=0; i<fbcount; ++i)
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{
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XVisualInfo *vi = glXGetVisualFromFBConfig( display, fbc[i] );
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if ( vi )
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{
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int samp_buf, samples;
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glXGetFBConfigAttrib( display, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf );
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glXGetFBConfigAttrib( display, fbc[i], GLX_SAMPLES , &samples );
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printf( " Matching fbconfig %d, visual ID 0x%2x: SAMPLE_BUFFERS = %d,"
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" SAMPLES = %d\n",
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i, vi -> visualid, samp_buf, samples );
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if ( best_fbc < 0 || samp_buf && samples > best_num_samp )
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best_fbc = i, best_num_samp = samples;
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if ( worst_fbc < 0 || !samp_buf || samples < worst_num_samp )
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worst_fbc = i, worst_num_samp = samples;
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}
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XFree( vi );
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}
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GLXFBConfig bestFbc = fbc[ best_fbc ];
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// Be sure to free the FBConfig list allocated by glXChooseFBConfig()
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XFree( fbc );
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// Get a visual
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XVisualInfo *vi = glXGetVisualFromFBConfig( display, bestFbc );
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printf( "Chosen visual ID = 0x%x\n", vi->visualid );
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printf( "Creating colormap\n" );
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XSetWindowAttributes swa;
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Colormap cmap;
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swa.colormap = cmap = XCreateColormap( display,
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RootWindow( display, vi->screen ),
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vi->visual, AllocNone );
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swa.background_pixmap = None ;
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swa.border_pixel = 0;
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swa.event_mask = StructureNotifyMask;
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printf( "Creating window\n" );
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Window win = XCreateWindow( display, RootWindow( display, vi->screen ),
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0, 0, 100, 100, 0, vi->depth, InputOutput,
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vi->visual,
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CWBorderPixel|CWColormap|CWEventMask, &swa );
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if ( !win )
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{
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printf( "Failed to create window.\n" );
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exit(1);
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}
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// Done with the visual info data
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XFree( vi );
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XStoreName( display, win, "GL 3.0 Window" );
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printf( "Mapping window\n" );
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XMapWindow( display, win );
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// Get the default screen's GLX extension list
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const char *glxExts = glXQueryExtensionsString( display,
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DefaultScreen( display ) );
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// NOTE: It is not necessary to create or make current to a context before
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// calling glXGetProcAddressARB
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glXCreateContextAttribsARBProc glXCreateContextAttribsARB = 0;
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glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)
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glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
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GLXContext ctx = 0;
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// Install an X error handler so the application won't exit if GL 3.0
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// context allocation fails.
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//
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// Note this error handler is global. All display connections in all threads
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// of a process use the same error handler, so be sure to guard against other
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// threads issuing X commands while this code is running.
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ctxErrorOccurred = false;
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int (*oldHandler)(Display*, XErrorEvent*) =
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XSetErrorHandler(&ctxErrorHandler);
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// Check for the GLX_ARB_create_context extension string and the function.
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// If either is not present, use GLX 1.3 context creation method.
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if ( !isExtensionSupported( glxExts, "GLX_ARB_create_context" ) ||
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!glXCreateContextAttribsARB )
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{
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printf( "glXCreateContextAttribsARB() not found"
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" ... using old-style GLX context\n" );
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ctx = glXCreateNewContext( display, bestFbc, GLX_RGBA_TYPE, 0, True );
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}
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// If it does, try to get a GL 3.0 context!
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else
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{
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int context_attribs[] =
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{
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GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
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GLX_CONTEXT_MINOR_VERSION_ARB, 0,
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//GLX_CONTEXT_FLAGS_ARB , GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
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None
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};
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printf( "Creating context\n" );
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ctx = glXCreateContextAttribsARB( display, bestFbc, 0,
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True, context_attribs );
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// Sync to ensure any errors generated are processed.
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XSync( display, False );
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if ( !ctxErrorOccurred && ctx )
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printf( "Created GL 3.0 context\n" );
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else
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{
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// Couldn't create GL 3.0 context. Fall back to old-style 2.x context.
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// When a context version below 3.0 is requested, implementations will
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// return the newest context version compatible with OpenGL versions less
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// than version 3.0.
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// GLX_CONTEXT_MAJOR_VERSION_ARB = 1
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context_attribs[1] = 1;
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// GLX_CONTEXT_MINOR_VERSION_ARB = 0
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context_attribs[3] = 0;
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ctxErrorOccurred = false;
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printf( "Failed to create GL 3.0 context"
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" ... using old-style GLX context\n" );
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ctx = glXCreateContextAttribsARB( display, bestFbc, 0,
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True, context_attribs );
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}
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}
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// Sync to ensure any errors generated are processed.
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XSync( display, False );
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// Restore the original error handler
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XSetErrorHandler( oldHandler );
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if ( ctxErrorOccurred || !ctx )
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{
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printf( "Failed to create an OpenGL context\n" );
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exit(1);
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}
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// Verifying that context is a direct context
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if ( ! glXIsDirect ( display, ctx ) )
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{
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printf( "Indirect GLX rendering context obtained\n" );
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}
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else
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{
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printf( "Direct GLX rendering context obtained\n" );
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}
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printf( "Making context current\n" );
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glXMakeCurrent( display, win, ctx );
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glClearColor( 0, 0.5, 1, 1 );
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glClear( GL_COLOR_BUFFER_BIT );
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glXSwapBuffers ( display, win );
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*/
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