1 files changed, 58 insertions, 0 deletions
diff --git a/dom/canvas/WebGLExtensionCompressedTextureES3.cpp b/dom/canvas/WebGLExtensionCompressedTextureES3.cpp
new file mode 100644
index 0000000000..5e72ab6139
--- /dev/null
+++ b/dom/canvas/WebGLExtensionCompressedTextureES3.cpp
@@ -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 http://mozilla.org/MPL/2.0/. */
+
+#include "WebGLExtensions.h"
+
+#include "GLContext.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+#include "WebGLContext.h"
+#include "WebGLFormats.h"
+
+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);
+  };
+
+#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
+}
+
+}  // namespace mozilla