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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 http://mozilla.org/MPL/2.0/. */
use canvas_traits::webgl::WebGLVersion;
use dom::bindings::codegen::Bindings::OESTextureHalfFloatBinding::{self, OESTextureHalfFloatConstants};
use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
use dom::bindings::root::DomRoot;
use dom::webglrenderingcontext::WebGLRenderingContext;
use dom_struct::dom_struct;
use super::{constants as webgl, ext_constants as gl, WebGLExtension, WebGLExtensions, WebGLExtensionSpec};
#[dom_struct]
pub struct OESTextureHalfFloat {
reflector_: Reflector,
}
impl OESTextureHalfFloat {
fn new_inherited() -> OESTextureHalfFloat {
Self {
reflector_: Reflector::new(),
}
}
}
impl WebGLExtension for OESTextureHalfFloat {
type Extension = OESTextureHalfFloat;
fn new(ctx: &WebGLRenderingContext) -> DomRoot<OESTextureHalfFloat> {
reflect_dom_object(Box::new(OESTextureHalfFloat::new_inherited()),
&*ctx.global(),
OESTextureHalfFloatBinding::Wrap)
}
fn spec() -> WebGLExtensionSpec {
WebGLExtensionSpec::Specific(WebGLVersion::WebGL1)
}
fn is_supported(ext: &WebGLExtensions) -> bool {
ext.supports_any_gl_extension(&["GL_OES_texture_half_float",
"GL_ARB_half_float_pixel",
"GL_NV_half_float",
"GL_EXT_color_buffer_half_float"])
}
fn enable(ext: &WebGLExtensions) {
// Enable FLOAT text data type
let hf = OESTextureHalfFloatConstants::HALF_FLOAT_OES;
ext.enable_tex_type(hf);
let needs_replace = !ext.supports_gl_extension("GL_OES_texture_float");
if needs_replace {
// Special internal formats must be used to avoid clamped float values
ext.add_effective_tex_internal_format(webgl::RGBA, hf, gl::RGBA16F);
ext.add_effective_tex_internal_format(webgl::RGB, hf, gl::RGB16F);
ext.add_effective_tex_internal_format(webgl::LUMINANCE, hf, gl::LUMINANCE16F_ARB);
ext.add_effective_tex_internal_format(webgl::ALPHA, hf, gl::ALPHA16F_ARB);
ext.add_effective_tex_internal_format(webgl::LUMINANCE_ALPHA, hf, gl::LUMINANCE_ALPHA16F_ARB);
}
}
fn name() -> &'static str {
"OES_texture_half_float"
}
}
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