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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 super::{WebGLExtension, WebGLExtensionSpec, WebGLExtensions};
use canvas_traits::webgl::{is_gles, WebGLVersion};
use crate::dom::bindings::codegen::Bindings::OESStandardDerivativesBinding;
use crate::dom::bindings::codegen::Bindings::OESStandardDerivativesBinding::OESStandardDerivativesConstants;
use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
use crate::dom::bindings::root::DomRoot;
use crate::dom::webglrenderingcontext::WebGLRenderingContext;
use dom_struct::dom_struct;
#[dom_struct]
pub struct OESStandardDerivatives {
reflector_: Reflector,
}
impl OESStandardDerivatives {
fn new_inherited() -> OESStandardDerivatives {
Self {
reflector_: Reflector::new(),
}
}
}
impl WebGLExtension for OESStandardDerivatives {
type Extension = OESStandardDerivatives;
fn new(ctx: &WebGLRenderingContext) -> DomRoot<OESStandardDerivatives> {
reflect_dom_object(
Box::new(OESStandardDerivatives::new_inherited()),
&*ctx.global(),
OESStandardDerivativesBinding::Wrap,
)
}
fn spec() -> WebGLExtensionSpec {
WebGLExtensionSpec::Specific(WebGLVersion::WebGL1)
}
fn is_supported(ext: &WebGLExtensions) -> bool {
// The standard derivatives are always available in desktop OpenGL.
!is_gles() || ext.supports_any_gl_extension(&["GL_OES_standard_derivatives"])
}
fn enable(ext: &WebGLExtensions) {
ext.enable_hint_target(
OESStandardDerivativesConstants::FRAGMENT_SHADER_DERIVATIVE_HINT_OES,
);
ext.enable_get_parameter_name(
OESStandardDerivativesConstants::FRAGMENT_SHADER_DERIVATIVE_HINT_OES,
);
}
fn name() -> &'static str {
"OES_standard_derivatives"
}
}
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