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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::ptr::NonNull;
use js::jsapi::JSObject;
use malloc_size_of::MallocSizeOf;
use super::{WebGLExtension, WebGLExtensionSpec, WebGLExtensions};
use crate::dom::bindings::reflector::DomObject;
use crate::dom::bindings::root::MutNullableDom;
use crate::dom::bindings::trace::JSTraceable;
use crate::dom::webglrenderingcontext::WebGLRenderingContext;
/// Trait used internally by WebGLExtensions to store and
/// handle the different WebGL extensions in a common list.
pub(crate) trait WebGLExtensionWrapper: JSTraceable + MallocSizeOf {
fn instance_or_init(
&self,
ctx: &WebGLRenderingContext,
ext: &WebGLExtensions,
) -> NonNull<JSObject>;
fn spec(&self) -> WebGLExtensionSpec;
fn is_supported(&self, _: &WebGLExtensions) -> bool;
fn is_enabled(&self) -> bool;
fn enable(&self, ext: &WebGLExtensions);
fn name(&self) -> &'static str;
}
#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
#[derive(JSTraceable, MallocSizeOf)]
pub(crate) struct TypedWebGLExtensionWrapper<T: WebGLExtension> {
extension: MutNullableDom<T::Extension>,
}
/// Typed WebGL Extension implementation.
/// Exposes the exact `MutNullableDom<DOMObject>` type defined by the extension.
impl<T: WebGLExtension> TypedWebGLExtensionWrapper<T> {
pub(crate) fn new() -> TypedWebGLExtensionWrapper<T> {
TypedWebGLExtensionWrapper {
extension: MutNullableDom::new(None),
}
}
}
impl<T> WebGLExtensionWrapper for TypedWebGLExtensionWrapper<T>
where
T: WebGLExtension + JSTraceable + MallocSizeOf + 'static,
{
#[allow(unsafe_code)]
fn instance_or_init(
&self,
ctx: &WebGLRenderingContext,
ext: &WebGLExtensions,
) -> NonNull<JSObject> {
let mut enabled = true;
let extension = self.extension.or_init(|| {
enabled = false;
T::new(ctx)
});
if !enabled {
self.enable(ext);
}
unsafe { NonNull::new_unchecked(extension.reflector().get_jsobject().get()) }
}
fn spec(&self) -> WebGLExtensionSpec {
T::spec()
}
fn is_supported(&self, ext: &WebGLExtensions) -> bool {
self.is_enabled() || T::is_supported(ext)
}
fn is_enabled(&self) -> bool {
self.extension.get().is_some()
}
fn enable(&self, ext: &WebGLExtensions) {
T::enable(ext);
}
fn name(&self) -> &'static str {
T::name()
}
}
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