Add initial support for WebGL compressed textures

3 files changed, 146 insertions, 0 deletions

diff --git a/components/script/dom/webgl_extensions/ext/mod.rs b/components/script/dom/webgl_extensions/ext/mod.rs
index 888e977c68e..ccb768cc04f 100644
--- a/components/script/dom/webgl_extensions/ext/mod.rs
+++ b/components/script/dom/webgl_extensions/ext/mod.rs
@@ -18,3 +18,5 @@ pub mod oestexturehalffloat;
 pub mod oestexturehalffloatlinear;
 pub mod oesvertexarrayobject;
 pub mod webglcolorbufferfloat;
+pub mod webglcompressedtextureetc1;
+pub mod webglcompressedtextures3tc;
diff --git a/components/script/dom/webgl_extensions/ext/webglcompressedtextureetc1.rs b/components/script/dom/webgl_extensions/ext/webglcompressedtextureetc1.rs
new file mode 100644
index 00000000000..29805fd4bdd
--- /dev/null
+++ b/components/script/dom/webgl_extensions/ext/webglcompressedtextureetc1.rs
@@ -0,0 +1,58 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+use super::{WebGLExtension, WebGLExtensionSpec, WebGLExtensions};
+use crate::dom::bindings::codegen::Bindings::WEBGLCompressedTextureETC1Binding;
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::webglrenderingcontext::WebGLRenderingContext;
+use crate::dom::webgltexture::{TexCompression, TexCompressionValidation};
+use canvas_traits::webgl::{TexFormat, WebGLVersion};
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct WEBGLCompressedTextureETC1 {
+    reflector_: Reflector,
+}
+
+impl WEBGLCompressedTextureETC1 {
+    fn new_inherited() -> WEBGLCompressedTextureETC1 {
+        Self {
+            reflector_: Reflector::new(),
+        }
+    }
+}
+
+impl WebGLExtension for WEBGLCompressedTextureETC1 {
+    type Extension = WEBGLCompressedTextureETC1;
+    fn new(ctx: &WebGLRenderingContext) -> DomRoot<WEBGLCompressedTextureETC1> {
+        reflect_dom_object(
+            Box::new(WEBGLCompressedTextureETC1::new_inherited()),
+            &*ctx.global(),
+            WEBGLCompressedTextureETC1Binding::Wrap,
+        )
+    }
+
+    fn spec() -> WebGLExtensionSpec {
+        WebGLExtensionSpec::Specific(WebGLVersion::WebGL1)
+    }
+
+    fn is_supported(ext: &WebGLExtensions) -> bool {
+        ext.supports_gl_extension("GL_OES_compressed_ETC1_RGB8_texture")
+    }
+
+    fn enable(ext: &WebGLExtensions) {
+        ext.add_tex_compression_formats(&[TexCompression {
+            format: TexFormat::CompressedRgbEtc1,
+            bytes_per_block: 8,
+            block_width: 4,
+            block_height: 4,
+            validation: TexCompressionValidation::None,
+        }]);
+    }
+
+    fn name() -> &'static str {
+        "WEBGL_compressed_texture_etc1"
+    }
+}
diff --git a/components/script/dom/webgl_extensions/ext/webglcompressedtextures3tc.rs b/components/script/dom/webgl_extensions/ext/webglcompressedtextures3tc.rs
new file mode 100644
index 00000000000..0e4385abd6b
--- /dev/null
+++ b/components/script/dom/webgl_extensions/ext/webglcompressedtextures3tc.rs
@@ -0,0 +1,86 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+use super::{WebGLExtension, WebGLExtensionSpec, WebGLExtensions};
+use crate::dom::bindings::codegen::Bindings::WEBGLCompressedTextureS3TCBinding;
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::webglrenderingcontext::WebGLRenderingContext;
+use crate::dom::webgltexture::{TexCompression, TexCompressionValidation};
+use canvas_traits::webgl::{TexFormat, WebGLVersion};
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct WEBGLCompressedTextureS3TC {
+    reflector_: Reflector,
+}
+
+impl WEBGLCompressedTextureS3TC {
+    fn new_inherited() -> WEBGLCompressedTextureS3TC {
+        Self {
+            reflector_: Reflector::new(),
+        }
+    }
+}
+
+impl WebGLExtension for WEBGLCompressedTextureS3TC {
+    type Extension = WEBGLCompressedTextureS3TC;
+    fn new(ctx: &WebGLRenderingContext) -> DomRoot<WEBGLCompressedTextureS3TC> {
+        reflect_dom_object(
+            Box::new(WEBGLCompressedTextureS3TC::new_inherited()),
+            &*ctx.global(),
+            WEBGLCompressedTextureS3TCBinding::Wrap,
+        )
+    }
+
+    fn spec() -> WebGLExtensionSpec {
+        WebGLExtensionSpec::Specific(WebGLVersion::WebGL1)
+    }
+
+    fn is_supported(ext: &WebGLExtensions) -> bool {
+        ext.supports_gl_extension("GL_EXT_texture_compression_s3tc") ||
+            ext.supports_all_gl_extension(&[
+                "GL_EXT_texture_compression_dxt1",
+                "GL_ANGLE_texture_compression_dxt3",
+                "GL_ANGLE_texture_compression_dxt5",
+            ])
+    }
+
+    fn enable(ext: &WebGLExtensions) {
+        ext.add_tex_compression_formats(&[
+            TexCompression {
+                format: TexFormat::CompressedRgbS3tcDxt1,
+                bytes_per_block: 8,
+                block_width: 4,
+                block_height: 4,
+                validation: TexCompressionValidation::S3TC,
+            },
+            TexCompression {
+                format: TexFormat::CompressedRgbaS3tcDxt1,
+                bytes_per_block: 8,
+                block_width: 4,
+                block_height: 4,
+                validation: TexCompressionValidation::S3TC,
+            },
+            TexCompression {
+                format: TexFormat::CompressedRgbaS3tcDxt3,
+                bytes_per_block: 16,
+                block_width: 4,
+                block_height: 4,
+                validation: TexCompressionValidation::S3TC,
+            },
+            TexCompression {
+                format: TexFormat::CompressedRgbaS3tcDxt5,
+                bytes_per_block: 16,
+                block_width: 4,
+                block_height: 4,
+                validation: TexCompressionValidation::S3TC,
+            },
+        ]);
+    }
+
+    fn name() -> &'static str {
+        "WEBGL_compressed_texture_s3tc"
+    }
+}