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use glutin_egl_sys as ffi;
#[derive(Debug)]
pub struct MakeCurrentGuard {
display: ffi::egl::types::EGLDisplay,
old_display: ffi::egl::types::EGLDisplay,
possibly_invalid: Option<MakeCurrentGuardInner>,
}
#[derive(Debug, PartialEq)]
struct MakeCurrentGuardInner {
old_draw_surface: ffi::egl::types::EGLSurface,
old_read_surface: ffi::egl::types::EGLSurface,
old_context: ffi::egl::types::EGLContext,
}
impl MakeCurrentGuard {
pub fn new(
display: ffi::egl::types::EGLDisplay,
draw_surface: ffi::egl::types::EGLSurface,
read_surface: ffi::egl::types::EGLSurface,
context: ffi::egl::types::EGLContext,
) -> Result<Self, String> {
unsafe {
let egl = super::EGL.as_ref().unwrap();
let mut ret = MakeCurrentGuard {
display,
old_display: egl.GetCurrentDisplay(),
possibly_invalid: Some(MakeCurrentGuardInner {
old_draw_surface: egl
.GetCurrentSurface(ffi::egl::DRAW as i32),
old_read_surface: egl
.GetCurrentSurface(ffi::egl::READ as i32),
old_context: egl.GetCurrentContext(),
}),
};
if ret.old_display == ffi::egl::NO_DISPLAY {
ret.invalidate();
}
let res =
egl.MakeCurrent(display, draw_surface, read_surface, context);
if res == 0 {
let err = egl.GetError();
Err(format!("`eglMakeCurrent` failed: 0x{:x}", err))
} else {
Ok(ret)
}
}
}
pub fn if_any_same_then_invalidate(
&mut self,
draw_surface: ffi::egl::types::EGLSurface,
read_surface: ffi::egl::types::EGLSurface,
context: ffi::egl::types::EGLContext,
) {
if self.possibly_invalid.is_some() {
let pi = self.possibly_invalid.as_ref().unwrap();
if pi.old_draw_surface == draw_surface
&& draw_surface != ffi::egl::NO_SURFACE
|| pi.old_read_surface == read_surface
&& read_surface != ffi::egl::NO_SURFACE
|| pi.old_context == context
{
self.invalidate();
}
}
}
pub fn invalidate(&mut self) {
self.possibly_invalid.take();
}
}
impl Drop for MakeCurrentGuard {
fn drop(&mut self) {
let egl = super::EGL.as_ref().unwrap();
let (draw_surface, read_surface, context) =
match self.possibly_invalid.take() {
Some(inner) => (
inner.old_draw_surface,
inner.old_read_surface,
inner.old_context,
),
None => (
ffi::egl::NO_SURFACE,
ffi::egl::NO_SURFACE,
ffi::egl::NO_CONTEXT,
),
};
let display = match self.old_display {
ffi::egl::NO_DISPLAY => self.display,
old_display => old_display,
};
unsafe {
let res =
egl.MakeCurrent(display, draw_surface, read_surface, context);
if res == 0 {
let err = egl.GetError();
panic!("`eglMakeCurrent` failed: 0x{:x}", err)
}
}
}
}