1 files changed, 68 insertions, 0 deletions
diff --git a/dom/canvas/WebGLExtensionCompressedTextureES3.cpp b/dom/canvas/WebGLExtensionCompressedTextureES3.cpp
new file mode 100644
index 000000000..974e4283f
--- /dev/null
+++ b/dom/canvas/WebGLExtensionCompressedTextureES3.cpp
@@ -0,0 +1,68 @@
+/* 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/. */
+
+#include "WebGLExtensions.h"
+
+#include "GLContext.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+#include "WebGLContext.h"
+
+#ifdef FOO
+#error FOO is already defined! We use FOO() macros to keep things succinct in this file.
+#endif
+
+namespace mozilla {
+
+WebGLExtensionCompressedTextureES3::WebGLExtensionCompressedTextureES3(WebGLContext* webgl)
+    : WebGLExtensionBase(webgl)
+{
+    // GLES 3.0.4, p147, table 3.19
+    // GLES 3.0.4, p286+, $C.1 "ETC Compressed Texture Image Formats"
+    // Note that all compressed texture formats are filterable:
+    // GLES 3.0.4 p161:
+    // "[A] texture is complete unless any of the following conditions hold true:
+    //  [...]
+    //  * The effective internal format specified for the texture arrays is a sized
+    //    internal color format that is not texture-filterable (see table 3.13) and [the
+    //    mag filter requires filtering]."
+    // Compressed formats are not sized internal color formats, and indeed they are not
+    // listed in table 3.13.
+
+    RefPtr<WebGLContext> webgl_ = webgl; // Bug 1201275
+    const auto fnAdd = [&webgl_](GLenum sizedFormat, webgl::EffectiveFormat effFormat) {
+        auto& fua = webgl_->mFormatUsage;
+
+        auto usage = fua->EditUsage(effFormat);
+        usage->isFilterable = true;
+        fua->AllowSizedTexFormat(sizedFormat, usage);
+
+        webgl_->mCompressedTextureFormats.AppendElement(sizedFormat);
+    };
+
+#define FOO(x) LOCAL_GL_ ## x, webgl::EffectiveFormat::x
+
+    fnAdd(FOO(COMPRESSED_R11_EAC));
+    fnAdd(FOO(COMPRESSED_SIGNED_R11_EAC));
+    fnAdd(FOO(COMPRESSED_RG11_EAC));
+    fnAdd(FOO(COMPRESSED_SIGNED_RG11_EAC));
+    fnAdd(FOO(COMPRESSED_RGB8_ETC2));
+    fnAdd(FOO(COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2));
+    fnAdd(FOO(COMPRESSED_RGBA8_ETC2_EAC));
+
+    // sRGB support is manadatory in GL 4.3 and GL ES 3.0, which are the only
+    // versions to support ETC2.
+    fnAdd(FOO(COMPRESSED_SRGB8_ALPHA8_ETC2_EAC));
+    fnAdd(FOO(COMPRESSED_SRGB8_ETC2));
+    fnAdd(FOO(COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2));
+
+#undef FOO
+}
+
+WebGLExtensionCompressedTextureES3::~WebGLExtensionCompressedTextureES3()
+{
+}
+
+IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionCompressedTextureES3, WEBGL_compressed_texture_etc)
+
+} // namespace mozilla