From 89b65f3a02e621c076b1946563cbfc99682e5de8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <ecoal95@gmail.com>
Date: Mon, 7 Dec 2015 18:02:20 +0100
Subject: [PATCH 1/2] webgl: Use mediump in triangle test

Support for this should be almost universal.
---
 tests/html/test_webgl_triangle.html | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tests/html/test_webgl_triangle.html b/tests/html/test_webgl_triangle.html
index b55a746b4a2..980049f4466 100644
--- a/tests/html/test_webgl_triangle.html
+++ b/tests/html/test_webgl_triangle.html
@@ -19,9 +19,7 @@
    }
 </script>
 <script id="fragmentshader" type="x-shader">
-   #ifdef GL_ES
-   precision highp float;
-   #endif
+   precision mediump float;
 
    varying vec4 aVertexColor;
 

From a14b605c8e8a778a778983cdf7ccff7146b35e94 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <ecoal95@gmail.com>
Date: Mon, 7 Dec 2015 18:03:31 +0100
Subject: [PATCH 2/2] webgl: Add correct error handling to BufferSubData

From the WebGL spec:

> If data is null then an INVALID_VALUE error is generated.
---
 components/script/dom/webglrenderingcontext.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 37fc47d9d78..eecfeceee15 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -417,7 +417,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
         }
         let data = match data {
             Some(data) => data,
-            None => return,
+            None => return self.webgl_error(InvalidValue),
         };
         if offset < 0 {
             return self.webgl_error(InvalidValue);