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authorTomaka17 <pierre.krieger1708@gmail.com>2014-08-23 18:44:24 +0200
committerPierre Krieger <pierre.krieger1708@gmail.com>2015-05-03 10:24:42 +0200
commitde7b1aa2ebb8fcf7a9e605bf720d6e644d2fa33a (patch)
tree2e9a21dd41d06fd0a8cca4ef88e779021a213794
parentb9aa741c261b12c3edd7f17d228f0b639f203952 (diff)
downloadglutin-de7b1aa2ebb8fcf7a9e605bf720d6e644d2fa33a.tar.gz
glutin-de7b1aa2ebb8fcf7a9e605bf720d6e644d2fa33a.zip
Basic implementation of emscripten
-rw-r--r--src/api/emscripten/ffi.rs82
-rw-r--r--src/api/emscripten/mod.rs251
-rw-r--r--src/api/mod.rs1
-rw-r--r--src/platform/emscripten/mod.rs49
4 files changed, 383 insertions, 0 deletions
diff --git a/src/api/emscripten/ffi.rs b/src/api/emscripten/ffi.rs
new file mode 100644
index 0000000..34b6c17
--- /dev/null
+++ b/src/api/emscripten/ffi.rs
@@ -0,0 +1,82 @@
+#![allow(dead_code)]
+#![allow(non_snake_case)]
+#![allow(non_camel_case_types)]
+
+use libc;
+
+pub type EM_BOOL = libc::c_int;
+pub type EM_UTF8 = libc::c_char;
+pub type EMSCRIPTEN_WEBGL_CONTEXT_HANDLE = libc::c_int;
+pub type EMSCRIPTEN_RESULT = libc::c_int;
+
+pub type em_webgl_context_callback = extern fn(libc::c_int, *const libc::c_void, *mut libc::c_void)
+ -> EM_BOOL;
+
+#[repr(C)]
+pub struct EmscriptenWebGLContextAttributes {
+ pub alpha: EM_BOOL,
+ pub depth: EM_BOOL,
+ pub stencil: EM_BOOL,
+ pub antialias: EM_BOOL,
+ pub premultipliedAlpha: EM_BOOL,
+ pub preserveDrawingBuffer: EM_BOOL,
+ pub preferLowPowerToHighPerformance: EM_BOOL,
+ pub failIfMajorPerformanceCaveat: EM_BOOL,
+ pub majorVersion: libc::c_int,
+ pub minorVersion: libc::c_int,
+ pub enableExtensionsByDefault: EM_BOOL,
+}
+
+// values for EMSCRIPTEN_RESULT
+pub const EMSCRIPTEN_RESULT_SUCCESS: libc::c_int = 0;
+pub const EMSCRIPTEN_RESULT_DEFERRED: libc::c_int = 1;
+pub const EMSCRIPTEN_RESULT_NOT_SUPPORTED: libc::c_int = -1;
+pub const EMSCRIPTEN_RESULT_FAILED_NOT_DEFERRED: libc::c_int = -2;
+pub const EMSCRIPTEN_RESULT_INVALID_TARGET: libc::c_int = -3;
+pub const EMSCRIPTEN_RESULT_UNKNOWN_TARGET: libc::c_int = -4;
+pub const EMSCRIPTEN_RESULT_INVALID_PARAM: libc::c_int = -5;
+pub const EMSCRIPTEN_RESULT_FAILED: libc::c_int = -6;
+pub const EMSCRIPTEN_RESULT_NO_DATA: libc::c_int = -7;
+
+extern {
+ pub fn emscripten_webgl_init_context_attributes(attributes: *mut EmscriptenWebGLContextAttributes);
+ pub fn emscripten_webgl_create_context(target: *const libc::c_char,
+ attributes: *const EmscriptenWebGLContextAttributes) -> EMSCRIPTEN_WEBGL_CONTEXT_HANDLE;
+
+ pub fn emscripten_webgl_make_context_current(context: EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)
+ -> EMSCRIPTEN_RESULT;
+
+ pub fn emscripten_webgl_get_current_context() -> EMSCRIPTEN_WEBGL_CONTEXT_HANDLE;
+
+ pub fn emscripten_webgl_destroy_context(context: EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)
+ -> EMSCRIPTEN_RESULT;
+
+ pub fn emscripten_webgl_enable_extension(context: EMSCRIPTEN_WEBGL_CONTEXT_HANDLE,
+ extension: *const libc::c_char) -> EM_BOOL;
+
+ pub fn emscripten_set_webglcontextlost_callback(target: *const libc::c_char,
+ userData: *mut libc::c_void, useCapture: EM_BOOL, callback: em_webgl_context_callback)
+ -> EMSCRIPTEN_RESULT;
+ pub fn emscripten_set_webglcontextrestored_callback(target: *const libc::c_char,
+ userData: *mut libc::c_void, useCapture: EM_BOOL, callback: em_webgl_context_callback)
+ -> EMSCRIPTEN_RESULT;
+
+ pub fn emscripten_is_webgl_context_lost(target: *const libc::c_char) -> EM_BOOL;
+
+ // note: this function is not documented but is used by the ports of glfw, SDL and EGL
+ pub fn emscripten_GetProcAddress(name: *const libc::c_char) -> *const libc::c_void;
+
+
+ pub fn emscripten_request_fullscreen(target: *const libc::c_char,
+ deferUntilInEventHandler: EM_BOOL) -> EMSCRIPTEN_RESULT;
+
+ pub fn emscripten_exit_fullscreen() -> EMSCRIPTEN_RESULT;
+
+ pub fn emscripten_set_element_css_size(target: *const libc::c_char, width: libc::c_double,
+ height: libc::c_double) -> EMSCRIPTEN_RESULT;
+
+ pub fn emscripten_get_element_css_size(target: *const libc::c_char, width: *mut libc::c_double,
+ height: *mut libc::c_double) -> EMSCRIPTEN_RESULT;
+
+ pub fn emscripten_sleep(delay: libc::c_uint);
+}
diff --git a/src/api/emscripten/mod.rs b/src/api/emscripten/mod.rs
new file mode 100644
index 0000000..48b31a9
--- /dev/null
+++ b/src/api/emscripten/mod.rs
@@ -0,0 +1,251 @@
+#![cfg(target_os = "emscripten")]
+
+use std::ffi::CString;
+use libc;
+use {Event, BuilderAttribs, CreationError, MouseCursor};
+use Api;
+use PixelFormat;
+use GlContext;
+
+use std::collections::VecDeque;
+
+mod ffi;
+
+pub struct Window {
+ context: ffi::EMSCRIPTEN_WEBGL_CONTEXT_HANDLE,
+}
+
+pub struct PollEventsIterator<'a> {
+ window: &'a Window,
+}
+
+impl<'a> Iterator for PollEventsIterator<'a> {
+ type Item = Event;
+
+ fn next(&mut self) -> Option<Event> {
+ None
+ }
+}
+
+pub struct WaitEventsIterator<'a> {
+ window: &'a Window,
+}
+
+impl<'a> Iterator for WaitEventsIterator<'a> {
+ type Item = Event;
+
+ fn next(&mut self) -> Option<Event> {
+ None
+ }
+}
+
+#[derive(Clone)]
+pub struct WindowProxy;
+
+impl WindowProxy {
+ pub fn wakeup_event_loop(&self) {
+ unimplemented!()
+ }
+}
+
+pub struct MonitorID;
+
+pub fn get_available_monitors() -> VecDeque<MonitorID> {
+ let mut list = VecDeque::new();
+ list.push_back(MonitorID);
+ list
+}
+
+pub fn get_primary_monitor() -> MonitorID {
+ MonitorID
+}
+
+impl MonitorID {
+ pub fn get_name(&self) -> Option<String> {
+ Some("Canvas".to_string())
+ }
+
+ pub fn get_dimensions(&self) -> (u32, u32) {
+ unimplemented!()
+ }
+}
+
+impl Window {
+ pub fn new(builder: BuilderAttribs) -> Result<Window, CreationError> {
+ // getting the default values of attributes
+ let mut attributes = unsafe {
+ use std::mem;
+ let mut attributes: ffi::EmscriptenWebGLContextAttributes = mem::uninitialized();
+ ffi::emscripten_webgl_init_context_attributes(&mut attributes);
+ attributes
+ };
+
+ // setting the attributes
+ // FIXME:
+ /*match builder.gl_version {
+ Some((major, minor)) => {
+ attributes.majorVersion = major as libc::c_int;
+ attributes.minorVersion = minor as libc::c_int;
+ },
+ None => ()
+ };*/
+
+ // creating the context
+ let context = unsafe {
+ use std::{mem, ptr};
+ let context = ffi::emscripten_webgl_create_context(ptr::null(), &attributes);
+ if context <= 0 {
+ return Err(CreationError::OsError(format!("Error while calling emscripten_webgl_create_context: {}",
+ error_to_str(mem::transmute(context)))));
+ }
+ context
+ };
+
+ // TODO: emscripten_set_webglcontextrestored_callback
+
+ Ok(Window {
+ context: context
+ })
+ }
+
+ pub fn is_closed(&self) -> bool {
+ use std::ptr;
+ unsafe { ffi::emscripten_is_webgl_context_lost(ptr::null()) != 0 }
+ }
+
+ pub fn set_title(&self, _title: &str) {
+ }
+
+ pub fn get_position(&self) -> Option<(i32, i32)> {
+ Some((0, 0))
+ }
+
+ pub fn set_position(&self, _: i32, _: i32) {
+ }
+
+ pub fn get_inner_size(&self) -> Option<(u32, u32)> {
+ unsafe {
+ use std::{mem, ptr};
+ let mut width = mem::uninitialized();
+ let mut height = mem::uninitialized();
+
+ if ffi::emscripten_get_element_css_size(ptr::null(), &mut width, &mut height)
+ != ffi::EMSCRIPTEN_RESULT_SUCCESS
+ {
+ None
+ } else {
+ Some((width as u32, height as u32))
+ }
+ }
+ }
+
+ pub fn get_outer_size(&self) -> Option<(u32, u32)> {
+ self.get_inner_size()
+ }
+
+ pub fn set_inner_size(&self, width: u32, height: u32) {
+ unsafe {
+ use std::ptr;
+ ffi::emscripten_set_element_css_size(ptr::null(), width as libc::c_double, height
+ as libc::c_double);
+ }
+ }
+
+ pub fn poll_events(&self) -> PollEventsIterator {
+ PollEventsIterator {
+ window: self,
+ }
+ }
+
+ pub fn wait_events(&self) -> WaitEventsIterator {
+ WaitEventsIterator {
+ window: self,
+ }
+ }
+
+ pub fn create_window_proxy(&self) -> WindowProxy {
+ WindowProxy
+ }
+
+ pub fn show(&self) {}
+ pub fn hide(&self) {}
+
+ pub fn platform_display(&self) -> *mut libc::c_void {
+ unimplemented!()
+ }
+
+ pub fn platform_window(&self) -> *mut libc::c_void {
+ unimplemented!()
+ }
+
+ pub fn set_window_resize_callback(&mut self, _: Option<fn(u32, u32)>) {
+ }
+
+ pub fn set_cursor(&self, _cursor: MouseCursor) {
+ unimplemented!()
+ }
+
+ pub fn hidpi_factor(&self) -> f32 {
+ 1.0
+ }
+}
+
+impl GlContext for Window {
+ unsafe fn make_current(&self) {
+ // TOOD: check if == EMSCRIPTEN_RESULT
+ ffi::emscripten_webgl_make_context_current(self.context);
+ }
+
+ fn is_current(&self) -> bool {
+ true // FIXME:
+ }
+
+ fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
+ let addr = CString::new(addr.as_bytes()).unwrap();
+ let addr = addr.as_ptr();
+
+ unsafe {
+ ffi::emscripten_GetProcAddress(addr) as *const _
+ }
+ }
+
+ fn swap_buffers(&self) {
+ unsafe {
+ ffi::emscripten_sleep(1); // FIXME:
+ }
+ }
+
+ fn get_api(&self) -> Api {
+ Api::WebGl
+ }
+
+ fn get_pixel_format(&self) -> PixelFormat {
+ unimplemented!();
+ }
+}
+
+impl Drop for Window {
+ fn drop(&mut self) {
+ unsafe {
+ ffi::emscripten_exit_fullscreen();
+ ffi::emscripten_webgl_destroy_context(self.context);
+ }
+ }
+}
+
+fn error_to_str(code: ffi::EMSCRIPTEN_RESULT) -> &'static str {
+ match code {
+ ffi::EMSCRIPTEN_RESULT_SUCCESS | ffi::EMSCRIPTEN_RESULT_DEFERRED
+ => "Internal error in the library (success detected as failure)",
+
+ ffi::EMSCRIPTEN_RESULT_NOT_SUPPORTED => "Not supported",
+ ffi::EMSCRIPTEN_RESULT_FAILED_NOT_DEFERRED => "Failed not deferred",
+ ffi::EMSCRIPTEN_RESULT_INVALID_TARGET => "Invalid target",
+ ffi::EMSCRIPTEN_RESULT_UNKNOWN_TARGET => "Unknown target",
+ ffi::EMSCRIPTEN_RESULT_INVALID_PARAM => "Invalid parameter",
+ ffi::EMSCRIPTEN_RESULT_FAILED => "Failed",
+ ffi::EMSCRIPTEN_RESULT_NO_DATA => "No data",
+
+ _ => "Undocumented error"
+ }
+}
diff --git a/src/api/mod.rs b/src/api/mod.rs
index b8cf9de..b1a7249 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -3,6 +3,7 @@ pub mod caca;
pub mod cocoa;
pub mod dlopen;
pub mod egl;
+pub mod emscripten;
pub mod glx;
pub mod osmesa;
pub mod win32;
diff --git a/src/platform/emscripten/mod.rs b/src/platform/emscripten/mod.rs
new file mode 100644
index 0000000..f9b011a
--- /dev/null
+++ b/src/platform/emscripten/mod.rs
@@ -0,0 +1,49 @@
+#![cfg(target_os = "emscripten")]
+
+use GlContext;
+
+pub use api::emscripten::{Window, WindowProxy, MonitorID, get_available_monitors};
+pub use api::emscripten::{get_primary_monitor, WaitEventsIterator, PollEventsIterator};
+
+#[cfg(feature = "headless")]
+pub struct HeadlessContext(Window);
+
+#[cfg(feature = "headless")]
+impl HeadlessContext {
+ /// See the docs in the crate root file.
+ pub fn new(builder: BuilderAttribs) -> Result<HeadlessContext, CreationError> {
+ Window::new(builder).map(|w| HeadlessContext(w))
+ }
+}
+
+#[cfg(feature = "headless")]
+impl GlContext for HeadlessContext {
+ unsafe fn make_current(&self) {
+ self.0.make_current()
+ }
+
+ fn is_current(&self) -> bool {
+ self.0.is_current()
+ }
+
+ fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
+ self.0.get_proc_address(addr)
+ }
+
+ fn swap_buffers(&self) {
+ self.0.swap_buffers()
+ }
+
+ fn get_api(&self) -> Api {
+ self.0.get_api()
+ }
+
+ fn get_pixel_format(&self) -> PixelFormat {
+ self.0.get_pixel_format()
+ }
+}
+
+#[cfg(feature = "headless")]
+unsafe impl Send for HeadlessContext {}
+#[cfg(feature = "headless")]
+unsafe impl Sync for HeadlessContext {}