Output unknown enum to aid debugging

When investigating issues with apps it's handy to see the actual enum value, not just that it's an invalid value. Based on http://crrev.com/c/2182578 by Courtney Goeltzenleuchter. Bug: b/155487768 Change-Id: I91611cb620a3bf2d302d667e0f168ca5cb6c9d3c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2507637 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Tim Van Patten <timvp@google.com>

Output unknown enum to aid debugging
bef8124f · Jamie Madill · Commit Bot · 8f36b846 · bef8124f · bef8124f
Commit bef8124f authored Jun 24, 2020 by Jamie Madill Committed by Commit Bot Oct 30, 2020
3 changed files
--- a/scripts/code_generation_hashes/GLenum_value_to_string_map.json
+++ b/scripts/code_generation_hashes/GLenum_value_to_string_map.json
 {
  "scripts/gen_gl_enum_utils.py":
-    "05fa5314e0a9e4974846f03a3f0c7a05",
+    "7c409a08898d49014584b10880f828df",
  "scripts/gl.xml":
    "e74a595068cbdd6064300be1e71b7cc9",
  "scripts/gl_angle_ext.xml":
@@ -8,7 +8,7 @@
  "scripts/registry_xml.py":
    "81856de1b9e68a4ed009f4e41b51ee72",
  "src/libANGLE/gl_enum_utils_autogen.cpp":
-    "823b9cac0022281ac7ea5aa7b23a3a66",
+    "aefd6f8d92a098843b886d739d02363e",
  "src/libANGLE/gl_enum_utils_autogen.h":
    "dd54f34be733affcb994fc315c3b972d"
 }
\ No newline at end of file
--- a/scripts/gen_gl_enum_utils.py
+++ b/scripts/gen_gl_enum_utils.py
@@ -54,13 +54,24 @@ template_gl_enums_source = """// GENERATED FILE - DO NOT EDIT.

 namespace gl
 {{
+namespace
+{{
+const char *UnknownGLenumToString(unsigned int value)
+{{
+    constexpr size_t kBufferSize = 64;
+    static thread_local char sBuffer[kBufferSize];
+    snprintf(sBuffer, kBufferSize, "0x%04X", value);
+    return sBuffer;
+}}
+}}  // anonymous namespace
+
 const char *GLenumToString(GLenumGroup enumGroup, unsigned int value)
 {{
    switch (enumGroup)
    {{
        {gl_enums_value_to_string_table}
        default:
-            return kUnknownGLenumString;
+            return UnknownGLenumToString(value);
    }}
 }}
 }}  // namespace gl
@@ -71,7 +82,7 @@ template_enum_group_case = """case GLenumGroup::{group_name}: {{
    switch (value) {{
        {inner_group_cases}
        default:
-            return kUnknownGLenumString;
+            return UnknownGLenumToString(value);
    }}
 }}
 """

--- a/src/libANGLE/gl_enum_utils_autogen.cpp
+++ b/src/libANGLE/gl_enum_utils_autogen.cpp