Update glslang version (#940)

* Update glslang

This moves to a version of glslang that is hosted with the slang project and that includes a patch for a high-priority fix that hasn't been upstreamed into the main glslang repository yet.

* Change a GLSL extension name

The glslang codebase changed the extension name required to enable certain features from `GL_KHX_shader_explicit_arithmetic_types` to `GL_EXT_shader_explicit_arithmetic_types`.

1 files changed, 1 insertions, 2 deletions

diff --git a/source/slang/emit.cpp b/source/slang/emit.cpp
index 1e9970b1a..c17bb3266 100644
--- a/source/slang/emit.cpp
+++ b/source/slang/emit.cpp
@@ -86,8 +86,7 @@ void requireGLSLHalfExtension(ExtensionUsageTracker* tracker)
         requireGLSLExtension(tracker, "GL_EXT_shader_16bit_storage");
 
         // https://github.com/KhronosGroup/GLSL/blob/master/extensions/ext/GL_EXT_shader_explicit_arithmetic_types.txt
-        // Use GL_KHX_shader_explicit_arithmetic_types because that is what appears defined in glslang 
-        requireGLSLExtension(tracker, "GL_KHX_shader_explicit_arithmetic_types");
+        requireGLSLExtension(tracker, "GL_EXT_shader_explicit_arithmetic_types");
         
         tracker->hasHalfExtension = true;
     }