Implement EXT_texture_filter_anisotropic

10 files changed, 262 insertions, 122 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 16feb52cb6d..f4a083be3b5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -274,7 +274,7 @@ dependencies = [
  "cssparser 0.23.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -291,7 +291,7 @@ version = "0.0.1"
 dependencies = [
  "cssparser 0.23.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "malloc_size_of 0.0.1",
@@ -336,7 +336,7 @@ name = "cgl"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -425,7 +425,7 @@ dependencies = [
  "embedder_traits 0.0.1",
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx_traits 0.0.1",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1063,7 +1063,7 @@ dependencies = [
 
 [[package]]
 name = "gleam"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "gl_generator 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1289,7 +1289,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cgl 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "leaky-cow 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1548,7 +1548,7 @@ dependencies = [
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "gaol 0.0.1 (git+https://github.com/servo/gaol)",
  "gfx 0.0.1",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "layout_thread 0.0.1",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2043,7 +2043,7 @@ dependencies = [
  "core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "gl_generator 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libloading 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2490,7 +2490,7 @@ dependencies = [
  "encoding_rs 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "half 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.22.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2712,7 +2712,7 @@ dependencies = [
  "bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "gdi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libservo 0.0.1",
@@ -2774,7 +2774,7 @@ dependencies = [
  "cmake 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "expat-sys 2.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "glx 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "io-surface 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3525,7 +3525,7 @@ dependencies = [
  "euclid 0.17.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "freetype 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3846,7 +3846,7 @@ dependencies = [
 "checksum getopts 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "d9047cfbd08a437050b363d35ef160452c5fe8ea5187ae0a624708c91581d685"
 "checksum gif 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8a80d6fe9e52f637df9afd4779449a7be17c39cc9c35b01589bb833f956ba596"
 "checksum gl_generator 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a795170cbd85b5a7baa58d6d7525cae6a03e486859860c220f7ebbbdd379d0a"
-"checksum gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e47b39459e47b76be4d2c82702932cdc66df09dcb8f813424167991adb8b3380"
+"checksum gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "12b793fcf40a23dd372f184c228ab3eb96f88c50bb4fba8319c483aa025a4e45"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
 "checksum glutin 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)" = "90de8e0391e57098acfbfe693b23065e9186255d370ebae12c933b7d77df8424"
 "checksum glx 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "63a6e7c2846e12626455f45ebaff9d92161436dd0fa703d9d198012e528ca7b9"
diff --git a/components/canvas/webgl_thread.rs b/components/canvas/webgl_thread.rs
index b48b72f2bfc..7b0b120d037 100644
--- a/components/canvas/webgl_thread.rs
+++ b/components/canvas/webgl_thread.rs
@@ -761,9 +761,6 @@ impl WebGLImpl {
                 Self::get_framebuffer_attachment_parameter(ctx.gl(), target, attachment, pname, chan),
             WebGLCommand::GetVertexAttribOffset(index, pname, ref chan) =>
                 Self::vertex_attrib_offset(ctx.gl(), index, pname, chan),
-            WebGLCommand::GetTexParameter(target, pname, ref chan) => {
-                chan.send(ctx.gl().get_tex_parameter_iv(target, pname)).unwrap();
-            }
             WebGLCommand::GetShaderPrecisionFormat(shader_type, precision_type, ref chan) =>
                 Self::shader_precision_format(ctx.gl(), shader_type, precision_type, chan),
             WebGLCommand::GetExtensions(ref chan) =>
@@ -864,10 +861,6 @@ impl WebGLImpl {
             WebGLCommand::TexImage2D(target, level, internal, width, height, format, data_type, ref data) =>
                 ctx.gl().tex_image_2d(target, level, internal, width, height,
                                       /*border*/0, format, data_type, Some(data)),
-            WebGLCommand::TexParameteri(target, name, value) =>
-                ctx.gl().tex_parameter_i(target, name, value),
-            WebGLCommand::TexParameterf(target, name, value) =>
-                ctx.gl().tex_parameter_f(target, name, value),
             WebGLCommand::TexSubImage2D(target, level, xoffset, yoffset, x, y, width, height, ref data) =>
                 ctx.gl().tex_sub_image_2d(target, level, xoffset, yoffset, x, y, width, height, data),
             WebGLCommand::DrawingBufferWidth(ref sender) =>
@@ -1020,6 +1013,18 @@ impl WebGLImpl {
                 };
                 sender.send(result).unwrap();
             }
+            WebGLCommand::GetTexParameterFloat(target, param, ref sender) => {
+                sender.send(ctx.gl().get_tex_parameter_fv(target, param as u32)).unwrap();
+            }
+            WebGLCommand::GetTexParameterInt(target, param, ref sender) => {
+                sender.send(ctx.gl().get_tex_parameter_iv(target, param as u32)).unwrap();
+            }
+            WebGLCommand::TexParameteri(target, param, value) => {
+                ctx.gl().tex_parameter_i(target, param as u32, value)
+            }
+            WebGLCommand::TexParameterf(target, param, value) => {
+                ctx.gl().tex_parameter_f(target, param as u32, value)
+            }
         }
 
         // TODO: update test expectations in order to enable debug assertions
diff --git a/components/canvas_traits/Cargo.toml b/components/canvas_traits/Cargo.toml
index 310c9e4eec7..e9012c92d96 100644
--- a/components/canvas_traits/Cargo.toml
+++ b/components/canvas_traits/Cargo.toml
@@ -13,7 +13,7 @@ path = "lib.rs"
 cssparser = "0.23.0"
 euclid = "0.17"
 ipc-channel = "0.10"
-gleam = "0.5"
+gleam = "0.5.1"
 lazy_static = "1"
 malloc_size_of = { path = "../malloc_size_of" }
 malloc_size_of_derive = { path = "../malloc_size_of_derive" }
diff --git a/components/canvas_traits/webgl.rs b/components/canvas_traits/webgl.rs
index 826a1c9b851..d5c7b488d59 100644
--- a/components/canvas_traits/webgl.rs
+++ b/components/canvas_traits/webgl.rs
@@ -206,7 +206,6 @@ pub enum WebGLCommand {
     FramebufferRenderbuffer(u32, u32, u32, Option<WebGLRenderbufferId>),
     FramebufferTexture2D(u32, u32, u32, Option<WebGLTextureId>, i32),
     GetExtensions(WebGLSender<String>),
-    GetTexParameter(u32, u32, WebGLSender<i32>),
     GetShaderPrecisionFormat(u32, u32, WebGLSender<(i32, i32, i32)>),
     GetActiveAttrib(WebGLProgramId, u32, WebGLSender<WebGLResult<(i32, u32, String)>>),
     GetActiveUniform(WebGLProgramId, u32, WebGLSender<WebGLResult<(i32, u32, String)>>),
@@ -259,8 +258,6 @@ pub enum WebGLCommand {
     VertexAttribPointer2f(u32, i32, bool, i32, u32),
     SetViewport(i32, i32, i32, i32),
     TexImage2D(u32, i32, i32, i32, i32, u32, u32, ByteBuf),
-    TexParameteri(u32, u32, i32),
-    TexParameterf(u32, u32, f32),
     TexSubImage2D(u32, i32, i32, i32, i32, i32, u32, u32, ByteBuf),
     DrawingBufferWidth(WebGLSender<i32>),
     DrawingBufferHeight(WebGLSender<i32>),
@@ -284,6 +281,10 @@ pub enum WebGLCommand {
     GetVertexAttribBool(u32, VertexAttribBool, WebGLSender<WebGLResult<bool>>),
     GetVertexAttribInt(u32, VertexAttribInt, WebGLSender<WebGLResult<i32>>),
     GetVertexAttribFloat4(u32, VertexAttribFloat4, WebGLSender<WebGLResult<[f32; 4]>>),
+    GetTexParameterFloat(u32, TexParameterFloat, WebGLSender<f32>),
+    GetTexParameterInt(u32, TexParameterInt, WebGLSender<i32>),
+    TexParameteri(u32, TexParameterInt, i32),
+    TexParameterf(u32, TexParameterFloat, f32),
 }
 
 macro_rules! define_resource_id_struct {
@@ -510,6 +511,7 @@ parameters! {
         Float(ParameterFloat {
             DepthClearValue = gl::DEPTH_CLEAR_VALUE,
             LineWidth = gl::LINE_WIDTH,
+            MaxTextureMaxAnisotropyExt = gl::MAX_TEXTURE_MAX_ANISOTROPY_EXT,
             PolygonOffsetFactor = gl::POLYGON_OFFSET_FACTOR,
             PolygonOffsetUnits = gl::POLYGON_OFFSET_UNITS,
             SampleCoverageValue = gl::SAMPLE_COVERAGE_VALUE,
@@ -554,6 +556,20 @@ parameters! {
 }
 
 parameters! {
+    TexParameter {
+        Float(TexParameterFloat {
+            TextureMaxAnisotropyExt = gl::TEXTURE_MAX_ANISOTROPY_EXT,
+        }),
+        Int(TexParameterInt {
+            TextureMagFilter = gl::TEXTURE_MAG_FILTER,
+            TextureMinFilter = gl::TEXTURE_MIN_FILTER,
+            TextureWrapS = gl::TEXTURE_WRAP_S,
+            TextureWrapT = gl::TEXTURE_WRAP_T,
+        }),
+    }
+}
+
+parameters! {
     VertexAttrib {
         Bool(VertexAttribBool {
             VertexAttribArrayEnabled = gl::VERTEX_ATTRIB_ARRAY_ENABLED,
diff --git a/components/script/dom/webgl_extensions/ext/exttexturefilteranisotropic.rs b/components/script/dom/webgl_extensions/ext/exttexturefilteranisotropic.rs
new file mode 100644
index 00000000000..203f4da6251
--- /dev/null
+++ b/components/script/dom/webgl_extensions/ext/exttexturefilteranisotropic.rs
@@ -0,0 +1,54 @@
+/* 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::EXTTextureFilterAnisotropicBinding;
+use dom::bindings::codegen::Bindings::EXTTextureFilterAnisotropicBinding::EXTTextureFilterAnisotropicConstants;
+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::{WebGLExtension, WebGLExtensions, WebGLExtensionSpec};
+
+#[dom_struct]
+pub struct EXTTextureFilterAnisotropic {
+    reflector_: Reflector,
+}
+
+impl EXTTextureFilterAnisotropic {
+    fn new_inherited() -> EXTTextureFilterAnisotropic {
+        Self {
+            reflector_: Reflector::new(),
+        }
+    }
+}
+
+impl WebGLExtension for EXTTextureFilterAnisotropic {
+    type Extension = EXTTextureFilterAnisotropic;
+
+    fn new(ctx: &WebGLRenderingContext) -> DomRoot<Self> {
+        reflect_dom_object(
+            Box::new(Self::new_inherited()),
+            &*ctx.global(),
+            EXTTextureFilterAnisotropicBinding::Wrap,
+        )
+    }
+
+    fn spec() -> WebGLExtensionSpec {
+        WebGLExtensionSpec::Specific(WebGLVersion::WebGL1)
+    }
+
+    fn is_supported(ext: &WebGLExtensions) -> bool {
+        ext.supports_gl_extension("GL_EXT_texture_filter_anisotropic")
+    }
+
+    fn enable(ext: &WebGLExtensions) {
+        ext.enable_get_tex_parameter_name(EXTTextureFilterAnisotropicConstants::TEXTURE_MAX_ANISOTROPY_EXT);
+        ext.enable_get_parameter_name(EXTTextureFilterAnisotropicConstants::MAX_TEXTURE_MAX_ANISOTROPY_EXT);
+    }
+
+    fn name() -> &'static str {
+        "EXT_texture_filter_anisotropic"
+    }
+}
diff --git a/components/script/dom/webgl_extensions/ext/mod.rs b/components/script/dom/webgl_extensions/ext/mod.rs
index b4b58fd10e1..e0c7b1f189a 100644
--- a/components/script/dom/webgl_extensions/ext/mod.rs
+++ b/components/script/dom/webgl_extensions/ext/mod.rs
@@ -6,6 +6,7 @@ use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderi
 use super::{ext_constants, WebGLExtension, WebGLExtensions, WebGLExtensionSpec};
 
 pub mod extshadertexturelod;
+pub mod exttexturefilteranisotropic;
 pub mod oeselementindexuint;
 pub mod oesstandardderivatives;
 pub mod oestexturefloat;
diff --git a/components/script/dom/webgl_extensions/extensions.rs b/components/script/dom/webgl_extensions/extensions.rs
index 92a34bac23e..33081e4bfe1 100644
--- a/components/script/dom/webgl_extensions/extensions.rs
+++ b/components/script/dom/webgl_extensions/extensions.rs
@@ -4,6 +4,7 @@
 
 use canvas_traits::webgl::{WebGLError, WebGLVersion};
 use dom::bindings::cell::DomRefCell;
+use dom::bindings::codegen::Bindings::EXTTextureFilterAnisotropicBinding::EXTTextureFilterAnisotropicConstants;
 use dom::bindings::codegen::Bindings::OESStandardDerivativesBinding::OESStandardDerivativesConstants;
 use dom::bindings::codegen::Bindings::OESTextureHalfFloatBinding::OESTextureHalfFloatConstants;
 use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
@@ -41,8 +42,16 @@ const DEFAULT_NOT_FILTERABLE_TEX_TYPES: [GLenum; 2] = [
 // Param names that are implemented for glGetParameter in a WebGL 1.0 context
 // but must trigger a InvalidEnum error until the related WebGL Extensions are enabled.
 // Example: https://www.khronos.org/registry/webgl/extensions/OES_standard_derivatives/
-const DEFAULT_DISABLED_GET_PARAMETER_NAMES_WEBGL1: [GLenum; 1] = [
-    OESStandardDerivativesConstants::FRAGMENT_SHADER_DERIVATIVE_HINT_OES
+const DEFAULT_DISABLED_GET_PARAMETER_NAMES_WEBGL1: [GLenum; 2] = [
+    EXTTextureFilterAnisotropicConstants::MAX_TEXTURE_MAX_ANISOTROPY_EXT,
+    OESStandardDerivativesConstants::FRAGMENT_SHADER_DERIVATIVE_HINT_OES,
+];
+
+// Param names that are implemented for glGetTexParameter in a WebGL 1.0 context
+// but must trigger a InvalidEnum error until the related WebGL Extensions are enabled.
+// Example: https://www.khronos.org/registry/webgl/extensions/OES_standard_derivatives/
+const DEFAULT_DISABLED_GET_TEX_PARAMETER_NAMES_WEBGL1: [GLenum; 1] = [
+    EXTTextureFilterAnisotropicConstants::TEXTURE_MAX_ANISOTROPY_EXT,
 ];
 
 /// WebGL features that are enabled/disabled by WebGL Extensions.
@@ -57,20 +66,30 @@ struct WebGLExtensionFeatures {
     hint_targets: FnvHashSet<GLenum>,
     /// WebGL GetParameter() names enabled by extensions.
     disabled_get_parameter_names: FnvHashSet<GLenum>,
+    /// WebGL GetTexParameter() names enabled by extensions.
+    disabled_get_tex_parameter_names: FnvHashSet<GLenum>,
     /// WebGL OES_element_index_uint extension.
     element_index_uint_enabled: bool,
 }
 
 impl WebGLExtensionFeatures {
     fn new(webgl_version: WebGLVersion) -> Self {
-        let (disabled_tex_types, disabled_get_parameter_names, element_index_uint_enabled) = match webgl_version {
+        let (
+            disabled_tex_types,
+            disabled_get_parameter_names,
+            disabled_get_tex_parameter_names,
+            element_index_uint_enabled,
+        ) = match webgl_version {
             WebGLVersion::WebGL1 => {
-                (DEFAULT_DISABLED_TEX_TYPES_WEBGL1.iter().cloned().collect(),
-                 DEFAULT_DISABLED_GET_PARAMETER_NAMES_WEBGL1.iter().cloned().collect(),
-                 false)
+                (
+                    DEFAULT_DISABLED_TEX_TYPES_WEBGL1.iter().cloned().collect(),
+                    DEFAULT_DISABLED_GET_PARAMETER_NAMES_WEBGL1.iter().cloned().collect(),
+                    DEFAULT_DISABLED_GET_TEX_PARAMETER_NAMES_WEBGL1.iter().cloned().collect(),
+                    false,
+                )
             },
             WebGLVersion::WebGL2 => {
-                (Default::default(), Default::default(), true)
+                (Default::default(), Default::default(), Default::default(), true)
             }
         };
         Self {
@@ -81,6 +100,7 @@ impl WebGLExtensionFeatures {
             query_parameter_handlers: Default::default(),
             hint_targets: Default::default(),
             disabled_get_parameter_names,
+            disabled_get_tex_parameter_names,
             element_index_uint_enabled,
         }
     }
@@ -236,7 +256,16 @@ impl WebGLExtensions {
         !self.features.borrow().disabled_get_parameter_names.contains(&name)
     }
 
+    pub fn enable_get_tex_parameter_name(&self, name: GLenum) {
+        self.features.borrow_mut().disabled_get_tex_parameter_names.remove(&name);
+    }
+
+    pub fn is_get_tex_parameter_name_enabled(&self, name: GLenum) -> bool {
+        !self.features.borrow().disabled_get_tex_parameter_names.contains(&name)
+    }
+
     fn register_all_extensions(&self) {
+        self.register::<ext::exttexturefilteranisotropic::EXTTextureFilterAnisotropic>();
         self.register::<ext::oeselementindexuint::OESElementIndexUint>();
         self.register::<ext::oesstandardderivatives::OESStandardDerivatives>();
         self.register::<ext::oestexturefloat::OESTextureFloat>();
diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 37638e36ee4..7beeef9261d 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -5,7 +5,7 @@
 use byteorder::{NativeEndian, ReadBytesExt, WriteBytesExt};
 use canvas_traits::canvas::{byte_swap, multiply_u8_pixel};
 use canvas_traits::webgl::{DOMToTextureCommand, Parameter, ProgramParameter};
-use canvas_traits::webgl::{ShaderParameter, VertexAttrib, WebGLCommand};
+use canvas_traits::webgl::{ShaderParameter, TexParameter, VertexAttrib, WebGLCommand};
 use canvas_traits::webgl::{WebGLContextShareMode, WebGLError};
 use canvas_traits::webgl::{WebGLFramebufferBindingRequest, WebGLMsg, WebGLMsgSender};
 use canvas_traits::webgl::{WebGLResult, WebGLSLVersion, WebGLVersion};
@@ -432,27 +432,35 @@ impl WebGLRenderingContext {
             constants::TEXTURE_CUBE_MAP => self.bound_texture(target),
             _ => return self.webgl_error(InvalidEnum),
         };
-        if let Some(texture) = texture {
-            handle_potential_webgl_error!(self, texture.tex_parameter(target, name, value));
 
-            // Validate non filterable TEXTURE_2D data_types
-            if target != constants::TEXTURE_2D {
-                return;
-            }
+        if !self.extension_manager.is_get_tex_parameter_name_enabled(name) {
+            return self.webgl_error(InvalidEnum);
+        }
 
-            let target = TexImageTarget::Texture2D;
-            let info = texture.image_info_for_target(&target, 0);
-            if info.is_initialized() {
-                self.validate_filterable_texture(&texture,
-                                                 target,
-                                                 0,
-                                                 info.internal_format().unwrap_or(TexFormat::RGBA),
-                                                 info.width(),
-                                                 info.height(),
-                                                 info.data_type().unwrap_or(TexDataType::UnsignedByte));
-            }
-        } else {
-            self.webgl_error(InvalidOperation)
+        let param = handle_potential_webgl_error!(self, TexParameter::from_u32(name), return);
+        let texture = match texture {
+            Some(tex) => tex,
+            None => return self.webgl_error(InvalidOperation),
+        };
+        handle_potential_webgl_error!(self, texture.tex_parameter(param, value), return);
+
+        // Validate non filterable TEXTURE_2D data_types
+        if target != constants::TEXTURE_2D {
+            return;
+        }
+
+        let target = TexImageTarget::Texture2D;
+        let info = texture.image_info_for_target(&target, 0);
+        if info.is_initialized() {
+            self.validate_filterable_texture(
+                &texture,
+                target,
+                0,
+                info.internal_format().unwrap_or(TexFormat::RGBA),
+                info.width(),
+                info.height(),
+                info.data_type().unwrap_or(TexDataType::UnsignedByte),
+            );
         }
     }
 
@@ -1437,21 +1445,16 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
     #[allow(unsafe_code)]
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.8
     unsafe fn GetTexParameter(&self, _cx: *mut JSContext, target: u32, pname: u32) -> JSVal {
-        let target_matches = match target {
+        match target {
             constants::TEXTURE_2D |
-            constants::TEXTURE_CUBE_MAP => true,
-            _ => false,
-        };
-
-        let pname_matches = match pname {
-            constants::TEXTURE_MAG_FILTER |
-            constants::TEXTURE_MIN_FILTER |
-            constants::TEXTURE_WRAP_S |
-            constants::TEXTURE_WRAP_T => true,
-            _ => false,
+            constants::TEXTURE_CUBE_MAP => {},
+            _ => {
+                self.webgl_error(InvalidEnum);
+                return NullValue();
+            }
         };
 
-        if !target_matches || !pname_matches {
+        if !self.extension_manager.is_get_tex_parameter_name_enabled(pname) {
             self.webgl_error(InvalidEnum);
             return NullValue();
         }
@@ -1461,10 +1464,18 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
             return NullValue();
         }
 
-        let (sender, receiver) = webgl_channel().unwrap();
-        self.send_command(WebGLCommand::GetTexParameter(target, pname, sender));
-
-        Int32Value(receiver.recv().unwrap())
+        match handle_potential_webgl_error!(self, TexParameter::from_u32(pname), return NullValue()) {
+            TexParameter::Float(param) => {
+                let (sender, receiver) = webgl_channel().unwrap();
+                self.send_command(WebGLCommand::GetTexParameterFloat(target, param, sender));
+                DoubleValue(receiver.recv().unwrap() as f64)
+            }
+            TexParameter::Int(param) => {
+                let (sender, receiver) = webgl_channel().unwrap();
+                self.send_command(WebGLCommand::GetTexParameterInt(target, param, sender));
+                Int32Value(receiver.recv().unwrap())
+            }
+        }
     }
 
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.3
diff --git a/components/script/dom/webgltexture.rs b/components/script/dom/webgltexture.rs
index 45b26997bc3..9fe77197825 100644
--- a/components/script/dom/webgltexture.rs
+++ b/components/script/dom/webgltexture.rs
@@ -4,8 +4,9 @@
 
 // https://www.khronos.org/registry/webgl/specs/latest/1.0/webgl.idl
 
-use canvas_traits::webgl::{webgl_channel, WebGLCommand, WebGLError, WebGLMsgSender, WebGLResult, WebGLTextureId};
-use canvas_traits::webgl::DOMToTextureCommand;
+use canvas_traits::webgl::{DOMToTextureCommand, TexParameter, TexParameterFloat};
+use canvas_traits::webgl::{TexParameterInt, WebGLCommand, WebGLError, WebGLMsgSender};
+use canvas_traits::webgl::{WebGLResult, WebGLTextureId, webgl_channel};
 use dom::bindings::cell::DomRefCell;
 use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
 use dom::bindings::codegen::Bindings::WebGLTextureBinding;
@@ -202,65 +203,75 @@ impl WebGLTexture {
     /// We have to follow the conversion rules for GLES 2.0. See:
     ///   https://www.khronos.org/webgl/public-mailing-list/archives/1008/msg00014.html
     ///
-    pub fn tex_parameter(&self,
-                     target: u32,
-                     name: u32,
-                     value: TexParameterValue) -> WebGLResult<()> {
-        let (int_value, _float_value) = match value {
+    pub fn tex_parameter(
+        &self,
+        param: TexParameter,
+        value: TexParameterValue,
+    ) -> WebGLResult<()> {
+        let target = self.target().unwrap();
+
+        let (int_value, float_value) = match value {
             TexParameterValue::Int(int_value) => (int_value, int_value as f32),
             TexParameterValue::Float(float_value) => (float_value as i32, float_value),
         };
 
-        match name {
-            constants::TEXTURE_MIN_FILTER => {
-                match int_value as u32 {
-                    constants::NEAREST |
-                    constants::LINEAR |
-                    constants::NEAREST_MIPMAP_NEAREST |
-                    constants::LINEAR_MIPMAP_NEAREST |
-                    constants::NEAREST_MIPMAP_LINEAR |
-                    constants::LINEAR_MIPMAP_LINEAR => {
-                        self.min_filter.set(Some(int_value as u32));
-                        self.renderer
-                            .send(WebGLCommand::TexParameteri(target, name, int_value))
-                            .unwrap();
-                        Ok(())
-                    },
-
-                    _ => Err(WebGLError::InvalidEnum),
+        match param {
+            TexParameter::Int(int_param) => {
+                match int_param {
+                    TexParameterInt::TextureMinFilter => {
+                        match int_value as u32 {
+                            constants::NEAREST |
+                            constants::LINEAR |
+                            constants::NEAREST_MIPMAP_NEAREST |
+                            constants::LINEAR_MIPMAP_NEAREST |
+                            constants::NEAREST_MIPMAP_LINEAR |
+                            constants::LINEAR_MIPMAP_LINEAR => {
+                                self.min_filter.set(Some(int_value as u32));
+                                self.renderer
+                                    .send(WebGLCommand::TexParameteri(target, int_param, int_value))
+                                    .unwrap();
+                                Ok(())
+                            }
+                            _ => Err(WebGLError::InvalidEnum),
+                        }
+                    }
+                    TexParameterInt::TextureMagFilter => {
+                        match int_value as u32 {
+                            constants::NEAREST | constants::LINEAR => {
+                                self.mag_filter.set(Some(int_value as u32));
+                                self.renderer
+                                    .send(WebGLCommand::TexParameteri(target, int_param, int_value))
+                                    .unwrap();
+                                Ok(())
+                            }
+                            _ => return Err(WebGLError::InvalidEnum),
+                        }
+                    }
+                    TexParameterInt::TextureWrapS | TexParameterInt::TextureWrapT => {
+                        match int_value as u32 {
+                            constants::CLAMP_TO_EDGE |
+                            constants::MIRRORED_REPEAT |
+                            constants::REPEAT => {
+                                self.renderer
+                                    .send(WebGLCommand::TexParameteri(target, int_param, int_value))
+                                    .unwrap();
+                                Ok(())
+                            }
+                            _ => Err(WebGLError::InvalidEnum),
+                        }
+                    }
                 }
-            },
-            constants::TEXTURE_MAG_FILTER => {
-                match int_value as u32 {
-                    constants::NEAREST |
-                    constants::LINEAR => {
-                        self.mag_filter.set(Some(int_value as u32));
-                        self.renderer
-                            .send(WebGLCommand::TexParameteri(target, name, int_value))
-                            .unwrap();
-                        Ok(())
-                    },
-
-                    _ => Err(WebGLError::InvalidEnum),
-                }
-            },
-            constants::TEXTURE_WRAP_S |
-            constants::TEXTURE_WRAP_T => {
-                match int_value as u32 {
-                    constants::CLAMP_TO_EDGE |
-                    constants::MIRRORED_REPEAT |
-                    constants::REPEAT => {
-                        self.renderer
-                            .send(WebGLCommand::TexParameteri(target, name, int_value))
-                            .unwrap();
-                        Ok(())
-                    },
-
-                    _ => Err(WebGLError::InvalidEnum),
+            }
+            TexParameter::Float(float_param @ TexParameterFloat::TextureMaxAnisotropyExt) => {
+                if float_value >= 1. {
+                    self.renderer
+                        .send(WebGLCommand::TexParameterf(target, float_param, float_value))
+                        .unwrap();
+                    Ok(())
+                } else {
+                    Err(WebGLError::InvalidValue)
                 }
-            },
-
-            _ => Err(WebGLError::InvalidEnum),
+            }
         }
     }
 
diff --git a/components/script/dom/webidls/EXTTextureFilterAnisotropic.webidl b/components/script/dom/webidls/EXTTextureFilterAnisotropic.webidl
new file mode 100644
index 00000000000..1c8c1a15171
--- /dev/null
+++ b/components/script/dom/webidls/EXTTextureFilterAnisotropic.webidl
@@ -0,0 +1,13 @@
+/* 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/. */
+/*
+ * WebGL IDL definitions from the Khronos specification:
+ * https://www.khronos.org/registry/webgl/extensions/EXT_texture_filter_anisotropic/
+ */
+
+[NoInterfaceObject]
+interface EXTTextureFilterAnisotropic {
+  const GLenum TEXTURE_MAX_ANISOTROPY_EXT       = 0x84FE;
+  const GLenum MAX_TEXTURE_MAX_ANISOTROPY_EXT   = 0x84FF;
+};