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Implement WebGL extensions.
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40 changed files with 1346 additions and 86 deletions
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use canvas_traits::CanvasMsg;
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use dom::bindings::codegen::Bindings::OESVertexArrayObjectBinding::{self, OESVertexArrayObjectMethods};
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use dom::bindings::codegen::Bindings::OESVertexArrayObjectBinding::OESVertexArrayObjectConstants;
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use dom::bindings::js::{JS, MutNullableJS, Root};
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use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
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use dom::webglrenderingcontext::WebGLRenderingContext;
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use dom::webglvertexarrayobjectoes::WebGLVertexArrayObjectOES;
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use dom_struct::dom_struct;
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use js::conversions::ToJSValConvertible;
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use js::jsapi::JSContext;
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use js::jsval::{JSVal, NullValue};
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use std::iter;
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use super::{WebGLExtension, WebGLExtensions};
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use webrender_traits::{self, WebGLCommand, WebGLError};
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#[dom_struct]
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pub struct OESVertexArrayObject {
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reflector_: Reflector,
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ctx: JS<WebGLRenderingContext>,
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bound_vao: MutNullableJS<WebGLVertexArrayObjectOES>,
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}
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impl OESVertexArrayObject {
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fn new_inherited(ctx: &WebGLRenderingContext) -> OESVertexArrayObject {
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Self {
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reflector_: Reflector::new(),
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ctx: JS::from_ref(ctx),
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bound_vao: MutNullableJS::new(None)
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}
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}
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#[allow(unsafe_code)]
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fn get_current_binding(&self, cx:*mut JSContext) -> JSVal {
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rooted!(in(cx) let mut rval = NullValue());
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if let Some(bound_vao) = self.bound_vao.get() {
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unsafe {
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bound_vao.to_jsval(cx, rval.handle_mut());
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}
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}
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rval.get()
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}
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}
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impl OESVertexArrayObjectMethods for OESVertexArrayObject {
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// https://www.khronos.org/registry/webgl/extensions/OES_vertex_array_object/
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fn CreateVertexArrayOES(&self) -> Option<Root<WebGLVertexArrayObjectOES>> {
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let (sender, receiver) = webrender_traits::channel::msg_channel().unwrap();
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self.ctx.send_renderer_message(CanvasMsg::WebGL(WebGLCommand::CreateVertexArray(sender)));
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let result = receiver.recv().unwrap();
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result.map(|vao_id| WebGLVertexArrayObjectOES::new(&self.global(), vao_id))
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}
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// https://www.khronos.org/registry/webgl/extensions/OES_vertex_array_object/
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fn DeleteVertexArrayOES(&self, vao: Option<&WebGLVertexArrayObjectOES>) {
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if let Some(vao) = vao {
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if vao.is_deleted() {
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return;
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}
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// Unbind deleted VAO if currently bound
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if let Some(bound_vao) = self.bound_vao.get() {
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if bound_vao.id() == vao.id() {
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self.bound_vao.set(None);
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self.ctx.send_renderer_message(CanvasMsg::WebGL(WebGLCommand::BindVertexArray(None)));
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}
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}
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// Remove VAO references from buffers
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let buffers = vao.bound_attrib_buffers();
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for buffer in buffers {
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buffer.remove_vao_reference(vao.id());
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}
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if let Some(buffer) = vao.bound_buffer_element_array() {
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buffer.remove_vao_reference(vao.id());
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}
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// Delete the vao
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self.ctx.send_renderer_message(CanvasMsg::WebGL(WebGLCommand::DeleteVertexArray(vao.id())));
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vao.set_deleted();
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}
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}
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// https://www.khronos.org/registry/webgl/extensions/OES_vertex_array_object/
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fn IsVertexArrayOES(&self, vao: Option<&WebGLVertexArrayObjectOES>) -> bool {
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// Conformance tests expect false if vao never bound
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vao.map_or(false, |vao| !vao.is_deleted() && vao.ever_bound())
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}
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// https://www.khronos.org/registry/webgl/extensions/OES_vertex_array_object/
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fn BindVertexArrayOES(&self, vao: Option<&WebGLVertexArrayObjectOES>) {
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if let Some(bound_vao) = self.bound_vao.get() {
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// Store buffers attached to attrib pointers
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let buffers = self.ctx.borrow_bound_attrib_buffers();
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bound_vao.set_bound_attrib_buffers(buffers.iter().map(|(key, buffer)| {
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(*buffer).add_vao_reference(bound_vao.id());
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(*key, &**buffer)
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}));
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// Store element array buffer
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let element_array = self.ctx.bound_buffer_element_array();
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bound_vao.set_bound_buffer_element_array(element_array.as_ref().map(|buffer| {
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buffer.add_vao_reference(bound_vao.id());
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&**buffer
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}));
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}
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if let Some(vao) = vao {
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if vao.is_deleted() {
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self.ctx.webgl_error(WebGLError::InvalidOperation);
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return;
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}
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self.ctx.send_renderer_message(CanvasMsg::WebGL(WebGLCommand::BindVertexArray(Some(vao.id()))));
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vao.set_ever_bound();
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self.bound_vao.set(Some(&vao));
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// Restore WebGLRenderingContext current bindings
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let buffers = vao.borrow_bound_attrib_buffers();
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self.ctx.set_bound_attrib_buffers(buffers.iter().map(|(k, v)| (*k, &**v)));
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let element_array = vao.bound_buffer_element_array();
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self.ctx.set_bound_buffer_element_array(element_array.as_ref().map(|buffer| &**buffer));
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} else {
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self.ctx.send_renderer_message(CanvasMsg::WebGL(WebGLCommand::BindVertexArray(None)));
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self.bound_vao.set(None);
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self.ctx.set_bound_attrib_buffers(iter::empty());
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}
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}
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}
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impl WebGLExtension for OESVertexArrayObject {
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type Extension = OESVertexArrayObject;
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fn new(ctx: &WebGLRenderingContext) -> Root<OESVertexArrayObject> {
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reflect_dom_object(box OESVertexArrayObject::new_inherited(ctx),
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&*ctx.global(),
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OESVertexArrayObjectBinding::Wrap)
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}
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fn is_supported(ext: &WebGLExtensions) -> bool {
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ext.supports_any_gl_extension(&["GL_OES_vertex_array_object",
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"GL_ARB_vertex_array_object",
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"GL_APPLE_vertex_array_object"])
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}
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fn enable(ext: &WebGLExtensions) {
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let query = OESVertexArrayObjectConstants::VERTEX_ARRAY_BINDING_OES;
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ext.add_query_parameter_handler(query, Box::new(|cx, webgl_ctx| {
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match webgl_ctx.get_extension_manager().get_dom_object::<OESVertexArrayObject>() {
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Some(dom_object) => {
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Ok(dom_object.get_current_binding(cx))
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},
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None => {
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// Extension instance not found!
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Err(WebGLError::InvalidOperation)
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}
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}
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}));
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}
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fn name() -> &'static str {
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"OES_vertex_array_object"
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}
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}
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