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#![cfg(target_os = "linux")]
use BuilderAttribs;
use CreationError;
use GlRequest;
use Api;
use libc;
use std::ffi::CString;
use std::{mem, ptr};
pub mod ffi;
pub struct Context {
egl: ffi::egl::Egl,
display: ffi::egl::types::EGLDisplay,
context: ffi::egl::types::EGLContext,
surface: ffi::egl::types::EGLSurface,
}
impl Context {
pub fn new(egl: ffi::egl::Egl, builder: BuilderAttribs,
native_display: Option<ffi::EGLNativeDisplayType>,
native_window: ffi::EGLNativeWindowType) -> Result<Context, CreationError>
{
if builder.sharing.is_some() {
unimplemented!()
}
let display = unsafe {
let display = egl.GetDisplay(native_display.unwrap_or(mem::transmute(ffi::egl::DEFAULT_DISPLAY)));
if display.is_null() {
return Err(CreationError::OsError("No EGL display connection available".to_string()));
}
display
};
let (_major, _minor) = unsafe {
let mut major: ffi::egl::types::EGLint = mem::uninitialized();
let mut minor: ffi::egl::types::EGLint = mem::uninitialized();
if egl.Initialize(display, &mut major, &mut minor) == 0 {
return Err(CreationError::OsError(format!("eglInitialize failed")))
}
(major, minor)
};
let use_gles2 = match builder.gl_version {
GlRequest::Specific(Api::OpenGlEs, (2, _)) => true,
GlRequest::Specific(Api::OpenGlEs, _) => false,
GlRequest::Specific(_, _) => return Err(CreationError::NotSupported),
GlRequest::GlThenGles { opengles_version: (2, _), .. } => true,
_ => false,
};
let mut attribute_list = vec!();
attribute_list.push(ffi::egl::RENDERABLE_TYPE as i32);
attribute_list.push(ffi::egl::OPENGL_ES2_BIT as i32);
attribute_list.push(ffi::egl::CONFORMANT as i32);
attribute_list.push(ffi::egl::OPENGL_ES2_BIT as i32);
attribute_list.push(ffi::egl::SURFACE_TYPE as i32);
attribute_list.push(ffi::egl::WINDOW_BIT as i32);
{
let (red, green, blue) = match builder.color_bits.unwrap_or(24) {
24 => (8, 8, 8),
16 => (6, 5, 6),
_ => panic!("Bad color_bits"),
};
attribute_list.push(ffi::egl::RED_SIZE as i32);
attribute_list.push(red);
attribute_list.push(ffi::egl::GREEN_SIZE as i32);
attribute_list.push(green);
attribute_list.push(ffi::egl::BLUE_SIZE as i32);
attribute_list.push(blue);
}
attribute_list.push(ffi::egl::DEPTH_SIZE as i32);
attribute_list.push(builder.depth_bits.unwrap_or(8) as i32);
attribute_list.push(ffi::egl::NONE as i32);
let config = unsafe {
let mut num_config: ffi::egl::types::EGLint = mem::uninitialized();
let mut config: ffi::egl::types::EGLConfig = mem::uninitialized();
if egl.ChooseConfig(display, attribute_list.as_ptr(), &mut config, 1,
&mut num_config) == 0
{
return Err(CreationError::OsError(format!("eglChooseConfig failed")))
}
if num_config <= 0 {
return Err(CreationError::OsError(format!("eglChooseConfig returned no available config")))
}
config
};
let surface = unsafe {
let surface = egl.CreateWindowSurface(display, config, native_window, ptr::null());
if surface.is_null() {
return Err(CreationError::OsError(format!("eglCreateWindowSurface failed")))
}
surface
};
let context = unsafe {
let mut context_attributes = vec!();
context_attributes.push(ffi::egl::CONTEXT_CLIENT_VERSION as i32);
context_attributes.push(2);
context_attributes.push(ffi::egl::NONE as i32);
let context = egl.CreateContext(display, config, ptr::null(),
context_attributes.as_ptr());
if context.is_null() {
return Err(CreationError::OsError(format!("eglCreateContext failed")))
}
context
};
Ok(Context {
egl: egl,
display: display,
context: context,
surface: surface,
})
}
pub fn make_current(&self) {
let ret = unsafe {
self.egl.MakeCurrent(self.display, self.surface, self.surface, self.context)
};
if ret == 0 {
panic!("eglMakeCurrent failed");
}
}
pub fn is_current(&self) -> bool {
unsafe { self.egl.GetCurrentContext() == self.context }
}
pub fn get_proc_address(&self, addr: &str) -> *const () {
let addr = CString::new(addr.as_bytes()).unwrap();
let addr = addr.as_ptr();
unsafe {
self.egl.GetProcAddress(addr) as *const ()
}
}
pub fn swap_buffers(&self) {
let ret = unsafe {
self.egl.SwapBuffers(self.display, self.surface)
};
if ret == 0 {
panic!("eglSwapBuffers failed");
}
}
pub fn get_api(&self) -> ::Api {
::Api::OpenGlEs
}
}
unsafe impl Send for Context {}
unsafe impl Sync for Context {}
impl Drop for Context {
fn drop(&mut self) {
use std::ptr;
unsafe {
// we don't call MakeCurrent(0, 0) because we are not sure that the context
// is still the current one
self.egl.DestroyContext(self.display, self.context);
self.egl.DestroySurface(self.display, self.surface);
self.egl.Terminate(self.display);
}
}
}
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