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authorPierre Krieger <pierre.krieger1708@gmail.com>2014-07-27 15:10:58 +0200
committerPierre Krieger <pierre.krieger1708@gmail.com>2014-07-27 15:10:58 +0200
commit4028b925d37f5e97063cac0356206f165580312e (patch)
treeb398ba547f88606ef114bdb6cfe54a74716a0a73 /src/x11
parentbf2773c2333a35e731eb81aba688fa0ecb2ebe80 (diff)
downloadglutin-4028b925d37f5e97063cac0356206f165580312e.tar.gz
glutin-4028b925d37f5e97063cac0356206f165580312e.zip
X11 implementation
Diffstat (limited to 'src/x11')
-rw-r--r--src/x11/ffi.rs255
-rw-r--r--src/x11/mod.rs336
2 files changed, 591 insertions, 0 deletions
diff --git a/src/x11/ffi.rs b/src/x11/ffi.rs
new file mode 100644
index 0000000..51e70b4
--- /dev/null
+++ b/src/x11/ffi.rs
@@ -0,0 +1,255 @@
+#![allow(dead_code)]
+#![allow(non_snake_case_functions)]
+#![allow(non_camel_case_types)]
+
+use libc;
+
+pub type Bool = libc::c_int;
+pub type Colormap = XID;
+pub type Cursor = XID;
+pub type Display = ();
+pub type GLXContext = *const ();
+pub type GLXContextID = XID;
+pub type GLXDrawable = XID;
+pub type GLXFBConfig = ();
+pub type GLXPbuffer = XID;
+pub type GLXPixmap = XID;
+pub type GLXWindow = XID;
+pub type Pixmap = XID;
+pub type Visual = (); // TODO: not sure
+pub type VisualID = libc::c_ulong; // TODO: not sure
+pub type Window = XID;
+pub type XID = uint;
+
+pub static AllocNone: libc::c_int = 0;
+pub static AllocAll: libc::c_int = 1;
+
+pub static InputOutput: libc::c_uint = 1;
+pub static InputOnly: libc::c_uint = 2;
+
+pub static CWBackPixmap: libc::c_ulong = (1<<0);
+pub static CWBackPixel: libc::c_ulong = (1<<1);
+pub static CWBorderPixmap: libc::c_ulong = (1<<2);
+pub static CWBorderPixel: libc::c_ulong = (1<<3);
+pub static CWBitGravity: libc::c_ulong = (1<<4);
+pub static CWWinGravity: libc::c_ulong = (1<<5);
+pub static CWBackingStore: libc::c_ulong = (1<<6);
+pub static CWBackingPlanes: libc::c_ulong = (1<<7);
+pub static CWBackingPixel: libc::c_ulong = (1<<8);
+pub static CWOverrideRedirect: libc::c_ulong = (1<<9);
+pub static CWSaveUnder: libc::c_ulong = (1<<10);
+pub static CWEventMask: libc::c_ulong = (1<<11);
+pub static CWDontPropagate: libc::c_ulong = (1<<12);
+pub static CWColormap: libc::c_ulong = (1<<13);
+pub static CWCursor: libc::c_ulong = (1<<14);
+
+pub static GLX_USE_GL: libc::c_int = 1;
+pub static GLX_BUFFER_SIZE: libc::c_int = 2;
+pub static GLX_LEVEL: libc::c_int = 3;
+pub static GLX_RGBA: libc::c_int = 4;
+pub static GLX_DOUBLEBUFFER: libc::c_int = 5;
+pub static GLX_STEREO: libc::c_int = 6;
+pub static GLX_AUX_BUFFERS: libc::c_int = 7;
+pub static GLX_RED_SIZE: libc::c_int = 8;
+pub static GLX_GREEN_SIZE: libc::c_int = 9;
+pub static GLX_BLUE_SIZE: libc::c_int = 10;
+pub static GLX_ALPHA_SIZE: libc::c_int = 11;
+pub static GLX_DEPTH_SIZE: libc::c_int = 12;
+pub static GLX_STENCIL_SIZE: libc::c_int = 13;
+pub static GLX_ACCUM_RED_SIZE: libc::c_int = 14;
+pub static GLX_ACCUM_GREEN_SIZE: libc::c_int = 15;
+pub static GLX_ACCUM_BLUE_SIZE: libc::c_int = 16;
+pub static GLX_ACCUM_ALPHA_SIZE: libc::c_int = 17;
+pub static GLX_BAD_SCREEN: libc::c_int = 1;
+pub static GLX_BAD_ATTRIBUTE: libc::c_int = 2;
+pub static GLX_NO_EXTENSION: libc::c_int = 3;
+pub static GLX_BAD_VISUAL: libc::c_int = 4;
+pub static GLX_BAD_CONTEXT: libc::c_int = 5;
+pub static GLX_BAD_VALUE: libc::c_int = 6;
+pub static GLX_BAD_ENUM: libc::c_int = 7;
+pub static GLX_VENDOR: libc::c_int = 1;
+pub static GLX_VERSION: libc::c_int = 2;
+pub static GLX_EXTENSIONS: libc::c_int = 3;
+pub static GLX_WINDOW_BIT: libc::c_int = 0x00000001;
+pub static GLX_PIXMAP_BIT: libc::c_int = 0x00000002;
+pub static GLX_PBUFFER_BIT: libc::c_int = 0x00000004;
+pub static GLX_RGBA_BIT: libc::c_int = 0x00000001;
+pub static GLX_COLOR_INDEX_BIT: libc::c_int = 0x00000002;
+pub static GLX_PBUFFER_CLOBBER_MASK: libc::c_int = 0x08000000;
+pub static GLX_FRONT_LEFT_BUFFER_BIT: libc::c_int = 0x00000001;
+pub static GLX_FRONT_RIGHT_BUFFER_BIT: libc::c_int = 0x00000002;
+pub static GLX_BACK_LEFT_BUFFER_BIT: libc::c_int = 0x00000004;
+pub static GLX_BACK_RIGHT_BUFFER_BIT: libc::c_int = 0x00000008;
+pub static GLX_AUX_BUFFERS_BIT: libc::c_int = 0x00000010;
+pub static GLX_DEPTH_BUFFER_BIT: libc::c_int = 0x00000020;
+pub static GLX_STENCIL_BUFFER_BIT: libc::c_int = 0x00000040;
+pub static GLX_ACCUM_BUFFER_BIT: libc::c_int = 0x00000080;
+pub static GLX_CONFIG_CAVEAT: libc::c_int = 0x20;
+pub static GLX_X_VISUAL_TYPE: libc::c_int = 0x22;
+pub static GLX_TRANSPARENT_TYPE: libc::c_int = 0x23;
+pub static GLX_TRANSPARENT_INDEX_VALUE: libc::c_int = 0x24;
+pub static GLX_TRANSPARENT_RED_VALUE: libc::c_int = 0x25;
+pub static GLX_TRANSPARENT_GREEN_VALUE: libc::c_int = 0x26;
+pub static GLX_TRANSPARENT_BLUE_VALUE: libc::c_int = 0x27;
+pub static GLX_TRANSPARENT_ALPHA_VALUE: libc::c_int = 0x28;
+pub static GLX_DONT_CARE: libc::c_int = 0xFFFFFFFF;
+pub static GLX_NONE: libc::c_int = 0x8000;
+pub static GLX_SLOW_CONFIG: libc::c_int = 0x8001;
+pub static GLX_TRUE_COLOR: libc::c_int = 0x8002;
+pub static GLX_DIRECT_COLOR: libc::c_int = 0x8003;
+pub static GLX_PSEUDO_COLOR: libc::c_int = 0x8004;
+pub static GLX_STATIC_COLOR: libc::c_int = 0x8005;
+pub static GLX_GRAY_SCALE: libc::c_int = 0x8006;
+pub static GLX_STATIC_GRAY: libc::c_int = 0x8007;
+pub static GLX_TRANSPARENT_RGB: libc::c_int = 0x8008;
+pub static GLX_TRANSPARENT_INDEX: libc::c_int = 0x8009;
+pub static GLX_VISUAL_ID: libc::c_int = 0x800B;
+pub static GLX_SCREEN: libc::c_int = 0x800C;
+pub static GLX_NON_CONFORMANT_CONFIG: libc::c_int = 0x800D;
+pub static GLX_DRAWABLE_TYPE: libc::c_int = 0x8010;
+pub static GLX_RENDER_TYPE: libc::c_int = 0x8011;
+pub static GLX_X_RENDERABLE: libc::c_int = 0x8012;
+pub static GLX_FBCONFIG_ID: libc::c_int = 0x8013;
+pub static GLX_RGBA_TYPE: libc::c_int = 0x8014;
+pub static GLX_COLOR_INDEX_TYPE: libc::c_int = 0x8015;
+pub static GLX_MAX_PBUFFER_WIDTH: libc::c_int = 0x8016;
+pub static GLX_MAX_PBUFFER_HEIGHT: libc::c_int = 0x8017;
+pub static GLX_MAX_PBUFFER_PIXELS: libc::c_int = 0x8018;
+pub static GLX_PRESERVED_CONTENTS: libc::c_int = 0x801B;
+pub static GLX_LARGEST_PBUFFER: libc::c_int = 0x801C;
+pub static GLX_WIDTH: libc::c_int = 0x801D;
+pub static GLX_HEIGHT: libc::c_int = 0x801E;
+pub static GLX_EVENT_MASK: libc::c_int = 0x801F;
+pub static GLX_DAMAGED: libc::c_int = 0x8020;
+pub static GLX_SAVED: libc::c_int = 0x8021;
+pub static GLX_WINDOW: libc::c_int = 0x8022;
+pub static GLX_PBUFFER: libc::c_int = 0x8023;
+pub static GLX_PBUFFER_HEIGHT: libc::c_int = 0x8040;
+pub static GLX_PBUFFER_WIDTH: libc::c_int = 0x8041;
+
+#[repr(C)]
+pub struct XVisualInfo {
+ pub visual: *mut Visual,
+ pub visualid: VisualID,
+ pub screen: libc::c_int,
+ pub depth: libc::c_int,
+ pub class: libc::c_int,
+ pub red_mask: libc::c_ulong,
+ pub green_mask: libc::c_ulong,
+ pub blue_mask: libc::c_ulong,
+ pub colormap_size: libc::c_int,
+ pub bits_per_rgb: libc::c_int,
+}
+
+#[repr(C)]
+pub struct XSetWindowAttributes {
+ pub background_pixmap: Pixmap,
+ pub background_pixel: libc::c_ulong,
+ pub border_pixmap: Pixmap,
+ pub border_pixel: libc::c_ulong,
+ pub bit_gravity: libc::c_int,
+ pub win_gravity: libc::c_int,
+ pub backing_store: libc::c_int,
+ pub backing_planes: libc::c_ulong,
+ pub backing_pixel: libc::c_long,
+ pub save_under: Bool,
+ pub event_mask: libc::c_long,
+ pub do_not_propagate_mask: libc::c_long,
+ pub override_redirect: Bool,
+ pub colormap: Colormap,
+ pub cursor: Cursor,
+}
+
+#[link(name = "GL")]
+#[link(name = "X11")]
+extern "C" {
+ pub fn XCloseDisplay(display: *mut Display);
+ pub fn XCreateColormap(display: *mut Display, w: Window,
+ visual: *mut Visual, alloc: libc::c_int) -> Colormap;
+ pub fn XCreateWindow(display: *mut Display, parent: Window, x: libc::c_int,
+ y: libc::c_int, width: libc::c_uint, height: libc::c_uint,
+ border_width: libc::c_uint, depth: libc::c_int, class: libc::c_uint,
+ visual: *mut Visual, valuemask: libc::c_ulong,
+ attributes: *mut XSetWindowAttributes) -> Window;
+ pub fn XDefaultRootWindow(display: *mut Display) -> Window;
+ pub fn XDefaultScreen(display: *mut Display) -> libc::c_int;
+ pub fn XFlush(display: *mut Display);
+ pub fn XMapWindow(display: *mut Display, w: Window);
+ pub fn XOpenDisplay(display_name: *const libc::c_char) -> *mut Display;
+ pub fn XStoreName(display: *mut Display, w: Window, window_name: *const libc::c_char);
+
+ pub fn glXCreateContext(dpy: *mut Display, vis: *const XVisualInfo,
+ shareList: GLXContext, direct: Bool) -> GLXContext;
+
+ pub fn glXChooseFBConfig(dpy: *mut Display, screen: libc::c_int,
+ attrib_list: *const libc::c_int, nelements: *mut libc::c_int);
+
+ pub fn glXChooseVisual(dpy: *mut Display, screen: libc::c_int,
+ attribList: *const libc::c_int) -> *const XVisualInfo;
+
+ pub fn glXGetProcAddress(procName: *const libc::c_uchar) -> *const ();
+
+ pub fn glXMakeCurrent(dpy: *mut Display, drawable: GLXDrawable,
+ ctx: GLXContext) -> Bool;
+
+ pub fn glXSwapBuffers(dpy: *mut Display, drawable: GLXDrawable);
+}
+
+/*
+GLXFBConfig *glXGetFBConfigs (Display *dpy, int screen, int *nelements);
+int glXGetFBConfigAttrib (Display *dpy, GLXFBConfig config, int attribute, int *value);
+XVisualInfo *glXGetVisualFromFBConfig (Display *dpy, GLXFBConfig config);
+GLXWindow glXCreateWindow (Display *dpy, GLXFBConfig config, Window win, const int *attrib_list);
+void glXDestroyWindow (Display *dpy, GLXWindow win);
+GLXPixmap glXCreatePixmap (Display *dpy, GLXFBConfig config, Pixmap pixmap, const int *attrib_list);
+void glXDestroyPixmap (Display *dpy, GLXPixmap pixmap);
+GLXPbuffer glXCreatePbuffer (Display *dpy, GLXFBConfig config, const int *attrib_list);
+void glXDestroyPbuffer (Display *dpy, GLXPbuffer pbuf);
+void glXQueryDrawable (Display *dpy, GLXDrawable draw, int attribute, unsigned int *value);
+GLXContext glXCreateNewContext (Display *dpy, GLXFBConfig config, int render_type, GLXContext share_list, Bool direct);
+Bool glXMakeContextCurrent (Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx);
+GLXDrawable glXGetCurrentReadDrawable (void);
+int glXQueryContext (Display *dpy, GLXContext ctx, int attribute, int *value);
+void glXSelectEvent (Display *dpy, GLXDrawable draw, unsigned long event_mask);
+void glXGetSelectedEvent (Display *dpy, GLXDrawable draw, unsigned long *event_mask);
+
+extern void glXDestroyContext( Display *dpy, GLXContext ctx );
+
+
+extern void glXCopyContext( Display *dpy, GLXContext src, GLXContext dst,
+ unsigned long mask );
+
+
+extern GLXPixmap glXCreateGLXPixmap( Display *dpy, XVisualInfo *visual,
+ Pixmap pixmap );
+
+extern void glXDestroyGLXPixmap( Display *dpy, GLXPixmap pixmap );
+
+extern Bool glXQueryExtension( Display *dpy, int *errorb, int *event );
+
+extern Bool glXQueryVersion( Display *dpy, int *maj, int *min );
+
+extern Bool glXIsDirect( Display *dpy, GLXContext ctx );
+
+extern int glXGetConfig( Display *dpy, XVisualInfo *visual,
+ int attrib, int *value );
+
+extern GLXContext glXGetCurrentContext( void );
+
+extern GLXDrawable glXGetCurrentDrawable( void );
+
+extern void glXWaitGL( void );
+
+extern void glXWaitX( void );
+
+extern void glXUseXFont( Font font, int first, int count, int list );
+
+extern const char *glXQueryExtensionsString( Display *dpy, int screen );
+
+extern const char *glXQueryServerString( Display *dpy, int screen, int name );
+
+extern const char *glXGetClientString( Display *dpy, int name );
+
+extern Display *glXGetCurrentDisplay( void );
+
+*/ \ No newline at end of file
diff --git a/src/x11/mod.rs b/src/x11/mod.rs
new file mode 100644
index 0000000..8849441
--- /dev/null
+++ b/src/x11/mod.rs
@@ -0,0 +1,336 @@
+use {Event, Hints};
+use libc;
+use std::{mem, ptr};
+
+mod ffi;
+
+pub struct Window {
+ display: *mut ffi::Display,
+ window: ffi::Window,
+ context: ffi::GLXContext,
+}
+
+impl Window {
+ pub fn new(dimensions: Option<(uint, uint)>, title: &str, hints: &Hints)
+ -> Result<Window, String>
+ {
+ // calling XOpenDisplay
+ let display = unsafe {
+ let display = ffi::XOpenDisplay(ptr::null());
+ if display.is_null() {
+ return Err(format!("XOpenDisplay failed"));
+ }
+ display
+ };
+
+ // TODO: set error handler
+
+ static VISUAL_ATTRIBUTES: [libc::c_int, ..5] = [
+ ffi::GLX_RGBA,
+ ffi::GLX_DEPTH_SIZE,
+ 24,
+ ffi::GLX_DOUBLEBUFFER,
+ 0
+ ];
+
+ // getting the visual infos
+ let visual_infos = unsafe {
+ let vi = ffi::glXChooseVisual(display, 0, VISUAL_ATTRIBUTES.as_ptr());
+ if vi.is_null() {
+ return Err(format!("glXChooseVisual failed"));
+ }
+ vi
+ };
+
+ // getting the root window
+ let root = unsafe { ffi::XDefaultRootWindow(display) };
+
+ // creating the color map
+ let cmap = unsafe {
+ let cmap = ffi::XCreateColormap(display, root,
+ (*visual_infos).visual, ffi::AllocNone);
+ // TODO: error checking?
+ cmap
+ };
+
+ // creating
+ let mut set_win_attr = {
+ let mut swa: ffi::XSetWindowAttributes = unsafe { mem::zeroed() };
+ swa.colormap = cmap;
+ //swa.event_mask = ExposureMask | KeyPressMask;
+ swa
+ };
+
+ // finally creating the window
+ let window = unsafe {
+ let win = ffi::XCreateWindow(display, root, 10, 10, 800, 600,
+ 0, (*visual_infos).depth, ffi::InputOutput, (*visual_infos).visual,
+ ffi::CWColormap/* | ffi::CWEventMask*/, &mut set_win_attr);
+ win
+ };
+
+ // showing window
+ unsafe { ffi::XMapWindow(display, window) };
+ unsafe { ffi::XStoreName(display, window, mem::transmute(title.as_slice().as_ptr())); }
+ unsafe { ffi::XFlush(display); }
+
+ // creating GL context
+ let context = unsafe {
+ ffi::glXCreateContext(display, visual_infos, ptr::null(), 1)
+ };
+
+ // returning
+ Ok(Window{
+ display: display,
+ window: window,
+ context: context,
+ })
+ }
+
+ pub fn should_close(&self) -> bool {
+ // TODO:
+ false
+ }
+
+ pub fn set_title(&self, title: &str) {
+ unsafe {
+ ffi::XStoreName(self.display, self.window,
+ mem::transmute(title.as_slice().as_ptr()));
+ }
+ }
+
+ pub fn get_position(&self) -> (uint, uint) {
+ unimplemented!()
+ }
+
+ pub fn set_position(&self, x: uint, y: uint) {
+ unimplemented!()
+ }
+
+ pub fn get_size(&self) -> (uint, uint) {
+ unimplemented!()
+ }
+
+ pub fn set_size(&self, x: uint, y: uint) {
+ unimplemented!()
+ }
+
+ pub fn poll_events(&self) -> Vec<Event> {
+ unimplemented!()
+ }
+
+ pub fn wait_events(&self) -> Vec<Event> {
+ // TODO:
+ Vec::new()
+ }
+
+ pub fn make_current(&self) {
+ let res = unsafe { ffi::glXMakeCurrent(self.display, self.window, self.context) };
+ if res == 0 {
+ fail!("glXMakeCurrent failed");
+ }
+ }
+
+ pub fn get_proc_address(&self, addr: &str) -> *const () {
+ use std::c_str::ToCStr;
+ use std::mem;
+
+ unsafe {
+ addr.with_c_str(|s| {
+ let p = ffi::glXGetProcAddress(mem::transmute(s)) as *const ();
+ if !p.is_null() { return p; }
+ println!("{}", p);
+ p
+ })
+ }
+ }
+
+ pub fn swap_buffers(&self) {
+ unsafe { ffi::glXSwapBuffers(self.display, self.window) }
+ }
+}
+
+impl Drop for Window {
+ fn drop(&mut self) {
+ unsafe { ffi::XCloseDisplay(self.display) }
+ }
+}
+
+
+
+/*
+ printf( "Getting matching framebuffer configs\n" );
+ int fbcount;
+ GLXFBConfig* fbc = glXChooseFBConfig(display, DefaultScreen(display), visual_attribs, &fbcount);
+ if (!fbc)
+ {
+ printf( "Failed to retrieve a framebuffer config\n" );
+ exit(1);
+ }
+ printf( "Found %d matching FB configs.\n", fbcount );
+
+ // Pick the FB config/visual with the most samples per pixel
+ printf( "Getting XVisualInfos\n" );
+ int best_fbc = -1, worst_fbc = -1, best_num_samp = -1, worst_num_samp = 999;
+
+ int i;
+ for (i=0; i<fbcount; ++i)
+ {
+ XVisualInfo *vi = glXGetVisualFromFBConfig( display, fbc[i] );
+ if ( vi )
+ {
+ int samp_buf, samples;
+ glXGetFBConfigAttrib( display, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf );
+ glXGetFBConfigAttrib( display, fbc[i], GLX_SAMPLES , &samples );
+
+ printf( " Matching fbconfig %d, visual ID 0x%2x: SAMPLE_BUFFERS = %d,"
+ " SAMPLES = %d\n",
+ i, vi -> visualid, samp_buf, samples );
+
+ if ( best_fbc < 0 || samp_buf && samples > best_num_samp )
+ best_fbc = i, best_num_samp = samples;
+ if ( worst_fbc < 0 || !samp_buf || samples < worst_num_samp )
+ worst_fbc = i, worst_num_samp = samples;
+ }
+ XFree( vi );
+ }
+
+ GLXFBConfig bestFbc = fbc[ best_fbc ];
+
+ // Be sure to free the FBConfig list allocated by glXChooseFBConfig()
+ XFree( fbc );
+
+ // Get a visual
+ XVisualInfo *vi = glXGetVisualFromFBConfig( display, bestFbc );
+ printf( "Chosen visual ID = 0x%x\n", vi->visualid );
+
+ printf( "Creating colormap\n" );
+ XSetWindowAttributes swa;
+ Colormap cmap;
+ swa.colormap = cmap = XCreateColormap( display,
+ RootWindow( display, vi->screen ),
+ vi->visual, AllocNone );
+ swa.background_pixmap = None ;
+ swa.border_pixel = 0;
+ swa.event_mask = StructureNotifyMask;
+
+ printf( "Creating window\n" );
+ Window win = XCreateWindow( display, RootWindow( display, vi->screen ),
+ 0, 0, 100, 100, 0, vi->depth, InputOutput,
+ vi->visual,
+ CWBorderPixel|CWColormap|CWEventMask, &swa );
+ if ( !win )
+ {
+ printf( "Failed to create window.\n" );
+ exit(1);
+ }
+
+ // Done with the visual info data
+ XFree( vi );
+
+ XStoreName( display, win, "GL 3.0 Window" );
+
+ printf( "Mapping window\n" );
+ XMapWindow( display, win );
+
+ // Get the default screen's GLX extension list
+ const char *glxExts = glXQueryExtensionsString( display,
+ DefaultScreen( display ) );
+
+ // NOTE: It is not necessary to create or make current to a context before
+ // calling glXGetProcAddressARB
+ glXCreateContextAttribsARBProc glXCreateContextAttribsARB = 0;
+ glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)
+ glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
+
+ GLXContext ctx = 0;
+
+ // Install an X error handler so the application won't exit if GL 3.0
+ // context allocation fails.
+ //
+ // Note this error handler is global. All display connections in all threads
+ // of a process use the same error handler, so be sure to guard against other
+ // threads issuing X commands while this code is running.
+ ctxErrorOccurred = false;
+ int (*oldHandler)(Display*, XErrorEvent*) =
+ XSetErrorHandler(&ctxErrorHandler);
+
+ // Check for the GLX_ARB_create_context extension string and the function.
+ // If either is not present, use GLX 1.3 context creation method.
+ if ( !isExtensionSupported( glxExts, "GLX_ARB_create_context" ) ||
+ !glXCreateContextAttribsARB )
+ {
+ printf( "glXCreateContextAttribsARB() not found"
+ " ... using old-style GLX context\n" );
+ ctx = glXCreateNewContext( display, bestFbc, GLX_RGBA_TYPE, 0, True );
+ }
+
+ // If it does, try to get a GL 3.0 context!
+ else
+ {
+ int context_attribs[] =
+ {
+ GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
+ GLX_CONTEXT_MINOR_VERSION_ARB, 0,
+ //GLX_CONTEXT_FLAGS_ARB , GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
+ None
+ };
+
+ printf( "Creating context\n" );
+ ctx = glXCreateContextAttribsARB( display, bestFbc, 0,
+ True, context_attribs );
+
+ // Sync to ensure any errors generated are processed.
+ XSync( display, False );
+ if ( !ctxErrorOccurred && ctx )
+ printf( "Created GL 3.0 context\n" );
+ else
+ {
+ // Couldn't create GL 3.0 context. Fall back to old-style 2.x context.
+ // When a context version below 3.0 is requested, implementations will
+ // return the newest context version compatible with OpenGL versions less
+ // than version 3.0.
+ // GLX_CONTEXT_MAJOR_VERSION_ARB = 1
+ context_attribs[1] = 1;
+ // GLX_CONTEXT_MINOR_VERSION_ARB = 0
+ context_attribs[3] = 0;
+
+ ctxErrorOccurred = false;
+
+ printf( "Failed to create GL 3.0 context"
+ " ... using old-style GLX context\n" );
+ ctx = glXCreateContextAttribsARB( display, bestFbc, 0,
+ True, context_attribs );
+ }
+ }
+
+ // Sync to ensure any errors generated are processed.
+ XSync( display, False );
+
+ // Restore the original error handler
+ XSetErrorHandler( oldHandler );
+
+ if ( ctxErrorOccurred || !ctx )
+ {
+ printf( "Failed to create an OpenGL context\n" );
+ exit(1);
+ }
+
+ // Verifying that context is a direct context
+ if ( ! glXIsDirect ( display, ctx ) )
+ {
+ printf( "Indirect GLX rendering context obtained\n" );
+ }
+ else
+ {
+ printf( "Direct GLX rendering context obtained\n" );
+ }
+
+ printf( "Making context current\n" );
+ glXMakeCurrent( display, win, ctx );
+
+ glClearColor( 0, 0.5, 1, 1 );
+ glClear( GL_COLOR_BUFFER_BIT );
+ glXSwapBuffers ( display, win );
+
+*/ \ No newline at end of file