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Auto merge of #21129 - servo:webgl, r=emilio
Implement instanced WebGL drawing calls (part of #20791) This is half of #20599. The check for drawElements is a bit more complex to implement. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/21129) <!-- Reviewable:end -->
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92
components/script/dom/webgl_extensions/ext/angleinstancedarrays.rs
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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/. */ | ||
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use canvas_traits::webgl::WebGLVersion; | ||
use dom::bindings::codegen::Bindings::ANGLEInstancedArraysBinding; | ||
use dom::bindings::codegen::Bindings::ANGLEInstancedArraysBinding::ANGLEInstancedArraysConstants; | ||
use dom::bindings::codegen::Bindings::ANGLEInstancedArraysBinding::ANGLEInstancedArraysMethods; | ||
use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object}; | ||
use dom::bindings::root::{Dom, DomRoot}; | ||
use dom::webglrenderingcontext::WebGLRenderingContext; | ||
use dom_struct::dom_struct; | ||
use super::{WebGLExtension, WebGLExtensions, WebGLExtensionSpec}; | ||
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#[dom_struct] | ||
pub struct ANGLEInstancedArrays { | ||
reflector_: Reflector, | ||
ctx: Dom<WebGLRenderingContext>, | ||
} | ||
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impl ANGLEInstancedArrays { | ||
fn new_inherited(ctx: &WebGLRenderingContext) -> Self { | ||
Self { | ||
reflector_: Reflector::new(), | ||
ctx: Dom::from_ref(ctx), | ||
} | ||
} | ||
} | ||
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impl WebGLExtension for ANGLEInstancedArrays { | ||
type Extension = Self; | ||
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fn new(ctx: &WebGLRenderingContext) -> DomRoot<Self> { | ||
reflect_dom_object( | ||
Box::new(ANGLEInstancedArrays::new_inherited(ctx)), | ||
&*ctx.global(), | ||
ANGLEInstancedArraysBinding::Wrap, | ||
) | ||
} | ||
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fn spec() -> WebGLExtensionSpec { | ||
WebGLExtensionSpec::Specific(WebGLVersion::WebGL1) | ||
} | ||
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fn is_supported(ext: &WebGLExtensions) -> bool { | ||
ext.supports_any_gl_extension(&[ | ||
"GL_ANGLE_instanced_arrays", | ||
"GL_ARB_instanced_arrays", | ||
"GL_EXT_instanced_arrays", | ||
"GL_NV_instanced_arrays", | ||
]) | ||
} | ||
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fn enable(ext: &WebGLExtensions) { | ||
ext.enable_get_vertex_attrib_name( | ||
ANGLEInstancedArraysConstants::VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE, | ||
); | ||
} | ||
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fn name() -> &'static str { | ||
"ANGLE_instanced_arrays" | ||
} | ||
} | ||
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impl ANGLEInstancedArraysMethods for ANGLEInstancedArrays { | ||
// https://www.khronos.org/registry/webgl/extensions/ANGLE_instanced_arrays/ | ||
fn DrawArraysInstancedANGLE( | ||
&self, | ||
mode: u32, | ||
first: i32, | ||
count: i32, | ||
primcount: i32, | ||
) { | ||
self.ctx.draw_arrays_instanced(mode, first, count, primcount); | ||
} | ||
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// https://www.khronos.org/registry/webgl/extensions/ANGLE_instanced_arrays/ | ||
fn DrawElementsInstancedANGLE( | ||
&self, | ||
mode: u32, | ||
count: i32, | ||
type_: u32, | ||
offset: i64, | ||
primcount: i32, | ||
) { | ||
self.ctx.draw_elements_instanced(mode, count, type_, offset, primcount); | ||
} | ||
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fn VertexAttribDivisorANGLE(&self, index: u32, divisor: u32) { | ||
self.ctx.vertex_attrib_divisor(index, divisor); | ||
} | ||
} |
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