webgl: Make bind* calls more spec-compliant

components/canvas/webgl_paint_task.rs

@@ -2,7 +2,7 @@
  * 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::{CanvasMsg, CanvasWebGLMsg, CanvasCommonMsg};
+use canvas_traits::{CanvasMsg, CanvasWebGLMsg, CanvasCommonMsg, WebGLShaderParameter, WebGLFramebufferBindingRequest};
 use euclid::size::Size2D;
 use core::nonzero::NonZero;
 use gleam::gl;
@@ -109,8 +109,8 @@ impl WebGLPaintTask {
                 self.delete_shader(id),
             CanvasWebGLMsg::BindBuffer(target, id) =>
                 self.bind_buffer(target, id),
-            CanvasWebGLMsg::BindFramebuffer(target, id) =>
-                self.bind_framebuffer(target, id),
+            CanvasWebGLMsg::BindFramebuffer(target, request) =>
+                self.bind_framebuffer(target, request),
             CanvasWebGLMsg::BindRenderbuffer(target, id) =>
                 self.bind_renderbuffer(target, id),
             CanvasWebGLMsg::BindTexture(target, id) =>
@@ -329,7 +329,13 @@ impl WebGLPaintTask {
     }
 
     #[inline]
-    fn bind_framebuffer(&self, target: u32, id: u32) {
+    fn bind_framebuffer(&self, target: u32, request: WebGLFramebufferBindingRequest) {
+        let id = match request {
+            WebGLFramebufferBindingRequest::Explicit(id) => id,
+            WebGLFramebufferBindingRequest::Default =>
+                self.gl_context.borrow_draw_buffer().unwrap().get_framebuffer(),
+        };
+
         gl::bind_framebuffer(target, id);
     }
 

components/canvas_traits/lib.rs

@@ -37,6 +37,14 @@ pub enum CanvasMsg {
     WebGL(CanvasWebGLMsg),
 }
 
+#[derive(Clone)]
+pub enum CanvasCommonMsg {
+    Close,
+    Recreate(Size2D<i32>),
+    SendPixelContents(Sender<Vec<u8>>),
+    SendNativeSurface(Sender<NativeSurface>),
+}
+
 #[derive(Clone)]
 pub enum Canvas2dMsg {
     Arc(Point2D<f32>, f32, f32, f32, bool),
@@ -102,7 +110,7 @@ pub enum CanvasWebGLMsg {
     DeleteProgram(u32),
     DeleteShader(u32),
     BindBuffer(u32, u32),
-    BindFramebuffer(u32, u32),
+    BindFramebuffer(u32, WebGLFramebufferBindingRequest),
     BindRenderbuffer(u32, u32),
     BindTexture(u32, u32),
     DrawArrays(u32, i32, i32),
@@ -132,6 +140,12 @@ pub enum WebGLError {
 
 pub type WebGLResult<T> = Result<T, WebGLError>;
 
+#[derive(Clone)]
+pub enum WebGLFramebufferBindingRequest {
+    Explicit(u32),
+    Default,
+}
+
 #[derive(Clone)]
 pub enum WebGLShaderParameter {
     Int(i32),
@@ -139,15 +153,6 @@ pub enum WebGLShaderParameter {
     Invalid,
 }
 
-#[derive(Clone)]
-pub enum CanvasCommonMsg {
-    Close,
-    Recreate(Size2D<i32>),
-    SendPixelContents(Sender<Vec<u8>>),
-    SendNativeSurface(Sender<NativeSurface>),
-}
-
-
 #[derive(Clone)]
 pub struct CanvasGradientStop {
     pub offset: f64,

components/script/dom/webglbuffer.rs

@@ -5,7 +5,7 @@
 // https://www.khronos.org/registry/webgl/specs/latest/1.0/webgl.idl
 use dom::bindings::codegen::Bindings::WebGLBufferBinding;
 use dom::bindings::global::GlobalRef;
-use dom::bindings::js::{Temporary, JSRef};
+use dom::bindings::js::Root;
 use dom::bindings::utils::reflect_dom_object;
 use dom::webglobject::WebGLObject;
 
@@ -44,9 +44,9 @@ impl WebGLBuffer {
 }
 
 pub trait WebGLBufferHelpers {
-    fn id(&self) -> u32;
-    fn bind(&self, target: u32);
-    fn delete(&self);
+    fn id(self) -> u32;
+    fn bind(self, target: u32);
+    fn delete(self);
 }
 
 impl<'a> WebGLBufferHelpers for &'a WebGLBuffer {

components/script/dom/webglframebuffer.rs

@@ -9,7 +9,7 @@ use dom::bindings::js::Root;
 use dom::bindings::utils::reflect_dom_object;
 use dom::webglobject::WebGLObject;
 
-use canvas_traits::{CanvasMsg, CanvasWebGLMsg};
+use canvas_traits::{CanvasMsg, CanvasWebGLMsg, WebGLFramebufferBindingRequest};
 use std::sync::mpsc::{channel, Sender};
 use std::cell::Cell;
 
@@ -49,13 +49,15 @@ pub trait WebGLFramebufferHelpers {
     fn delete(self);
 }
 
-impl<'a> WebGLFramebufferHelpers for JSRef<'a, WebGLFramebuffer> {
+impl<'a> WebGLFramebufferHelpers for &'a WebGLFramebuffer {
     fn id(self) -> u32 {
         self.id
     }
 
     fn bind(self, target: u32) {
-        self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::BindFramebuffer(target, self.id))).unwrap();
+        self.renderer.send(
+            CanvasMsg::WebGL(
+                CanvasWebGLMsg::BindFramebuffer(target, WebGLFramebufferBindingRequest::Explicit(self.id)))).unwrap();
     }
 
     fn delete(self) {

components/script/dom/webglprogram.rs

@@ -5,9 +5,17 @@
 // https://www.khronos.org/registry/webgl/specs/latest/1.0/webgl.idl
 use dom::bindings::codegen::Bindings::WebGLProgramBinding;
 use dom::bindings::global::GlobalRef;
-use dom::bindings::js::Root;
+use dom::bindings::js::{JS, MutNullableHeap, Root};
 use dom::bindings::utils::reflect_dom_object;
 use dom::webglobject::WebGLObject;
+use dom::webglshader::{WebGLShader, WebGLShaderHelpers};
+use dom::webglrenderingcontext::MAX_UNIFORM_AND_ATTRIBUTE_LEN;
+
+use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
+
+use canvas_traits::{CanvasMsg, CanvasWebGLMsg, WebGLResult, WebGLError};
+use std::sync::mpsc::{channel, Sender};
+use std::cell::Cell;
 
 #[dom_struct]
 pub struct WebGLProgram {
@@ -47,7 +55,7 @@ pub trait WebGLProgramHelpers {
     fn delete(self);
     fn link(self);
     fn use_program(self);
-    fn attach_shader(self, shader: JSRef<WebGLShader>) -> WebGLResult<()>;
+    fn attach_shader(self, shader: &WebGLShader) -> WebGLResult<()>;
     fn get_attrib_location(self, name: String) -> WebGLResult<Option<i32>>;
     fn get_uniform_location(self, name: String) -> WebGLResult<Option<i32>>;
 }
@@ -72,7 +80,7 @@ impl<'a> WebGLProgramHelpers for &'a WebGLProgram {
     }
 
     /// glAttachShader
-    fn attach_shader(self, shader: &'a WebGLShader) -> WebGLResult<()> {
+    fn attach_shader(self, shader: &WebGLShader) -> WebGLResult<()> {
         let shader_slot = match shader.gl_type() {
             constants::FRAGMENT_SHADER => &self.fragment_shader,
             constants::VERTEX_SHADER => &self.vertex_shader,
@@ -85,7 +93,7 @@ impl<'a> WebGLProgramHelpers for &'a WebGLProgram {
             return Err(WebGLError::InvalidOperation);
         }
 
-        shader_slot.set(Some(JS::from_rooted(shader)));
+        shader_slot.set(Some(JS::from_ref(shader)));
 
         self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::AttachShader(self.id, shader.id()))).unwrap();
 

components/script/dom/webglrenderingcontext.rs

@@ -3,10 +3,13 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use canvas::webgl_paint_task::WebGLPaintTask;
-use canvas_traits::{CanvasMsg, CanvasWebGLMsg, CanvasCommonMsg};
-use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding;
-use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::{
-    WebGLContextAttributes, WebGLRenderingContextMethods, WebGLRenderingContextConstants};
+use canvas_traits::
+            {CanvasMsg, CanvasWebGLMsg, CanvasCommonMsg, WebGLError,
+             WebGLShaderParameter, WebGLFramebufferBindingRequest};
+use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::
+            {self, WebGLContextAttributes, WebGLRenderingContextMethods};
+use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
+
 use dom::bindings::global::{GlobalRef, GlobalField};
 use dom::bindings::js::{JS, LayoutJS, Root};
 use dom::bindings::utils::{Reflector, reflect_dom_object};
@@ -22,7 +25,7 @@ use dom::webgluniformlocation::{WebGLUniformLocation, WebGLUniformLocationHelper
 use euclid::size::Size2D;
 use js::jsapi::{JSContext, JSObject, RootedValue};
 use js::jsapi::{JS_GetFloat32ArrayData, JS_GetObjectAsArrayBufferView};
-use js::jsval::{JSVal, UndefinedValue, NullValue, Int32Value};
+use js::jsval::{JSVal, UndefinedValue, NullValue, Int32Value, BooleanValue};
 use std::mem;
 use std::ptr;
 use std::slice;
@@ -116,10 +119,10 @@ impl<'a> WebGLRenderingContextMethods for &'a WebGLRenderingContext {
         // TODO(ecoal95): Implement the missing parameters from the spec
         let mut rval = RootedValue::new(cx, UndefinedValue());
         match parameter {
-            WebGLRenderingContextConstants::VERSION =>
+            constants::VERSION =>
                 "WebGL 1.0".to_jsval(cx, rval.handle_mut()),
-            WebGLRenderingContextConstants::RENDERER |
-            WebGLRenderingContextConstants::VENDOR =>
+            constants::RENDERER |
+            constants::VENDOR =>
                 "Mozilla/Servo".to_jsval(cx, rval.handle_mut()),
             _ => rval.ptr = NullValue(),
         }
@@ -199,6 +202,9 @@ impl<'a> WebGLRenderingContextMethods for &'a WebGLRenderingContext {
     fn BindBuffer(self, target: u32, buffer: Option<&WebGLBuffer>) {
         if let Some(buffer) = buffer {
             buffer.bind(target)
+        } else {
+            // Unbind the current buffer
+            self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::BindBuffer(target, 0))).unwrap()
         }
     }
 
@@ -206,6 +212,11 @@ impl<'a> WebGLRenderingContextMethods for &'a WebGLRenderingContext {
     fn BindFramebuffer(self, target: u32, framebuffer: Option<&WebGLFramebuffer>) {
         if let Some(framebuffer) = framebuffer {
             framebuffer.bind(target)
+        } else {
+            // Bind the default framebuffer
+            self.renderer.send(
+                CanvasMsg::WebGL(
+                    CanvasWebGLMsg::BindFramebuffer(target, WebGLFramebufferBindingRequest::Default))).unwrap()
         }
     }
 
@@ -213,6 +224,9 @@ impl<'a> WebGLRenderingContextMethods for &'a WebGLRenderingContext {
     fn BindRenderbuffer(self, target: u32, renderbuffer: Option<&WebGLRenderbuffer>) {
         if let Some(renderbuffer) = renderbuffer {
             renderbuffer.bind(target)
+        } else {
+            // Unbind the currently bound renderbuffer
+            self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::BindRenderbuffer(target, 0))).unwrap()
         }
     }
 
@@ -225,7 +239,7 @@ impl<'a> WebGLRenderingContextMethods for &'a WebGLRenderingContext {
 
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.5
     #[allow(unsafe_code)]
-    fn BufferData(self, cx: *mut JSContext, target: u32, data: Option<*mut JSObject>, usage: u32) {
+    fn BufferData(self, _cx: *mut JSContext, target: u32, data: Option<*mut JSObject>, usage: u32) {
         let data = match data {
             Some(data) => data,
             None => return,
@@ -447,7 +461,7 @@ impl<'a> WebGLRenderingContextMethods for &'a WebGLRenderingContext {
     fn VertexAttribPointer(self, attrib_id: u32, size: i32, data_type: u32,
                            normalized: bool, stride: i32, offset: i64) {
         match data_type {
-            WebGLRenderingContextConstants::FLOAT => {
+            constants::FLOAT => {
                let msg = CanvasMsg::WebGL(
                    CanvasWebGLMsg::VertexAttribPointer2f(attrib_id, size, normalized, stride, offset));
                 self.renderer.send(msg).unwrap()

components/script/dom/webglshader.rs

@@ -69,7 +69,7 @@ pub trait WebGLShaderHelpers {
     fn set_source(self, src: String);
 }
 
-impl<'a> WebGLShaderHelpers for JSRef<'a, WebGLShader> {
+impl<'a> WebGLShaderHelpers for &'a WebGLShader {
     fn id(self) -> u32 {
         self.id
     }

components/script/dom/webgltexture.rs

@@ -50,7 +50,7 @@ pub trait WebGLTextureHelpers {
 }
 
 impl<'a> WebGLTextureHelpers for &'a WebGLTexture {
-    fn id(&self) -> u32 {
+    fn id(self) -> u32 {
         self.id
     }