Parser: Implement extension GL_AMD_gpu_shader_half_float.

- Add built-in types: float16_t, f16vec, f16mat.
- Add support of half float constant: hf, HF.
- Extend built-in floating-point operators: +, -, *, /, ++, --, +=, -=,
  *=, /=, ==, !=, >=, <=, >, <.
- Add support of type conversions: float16_t -> XXX, XXX -> float16_t.
- Add new built-in functions.

SPIRV/CMakeLists.txt

@@ -11,10 +11,12 @@ set(SPVREMAP_SOURCES
     doc.cpp)
 
 set(HEADERS
+    bitutils.h
     spirv.hpp
     GLSL.std.450.h
     GLSL.ext.KHR.h
     GlslangToSpv.h
+    hex_float.h
     Logger.h
     SpvBuilder.h
     spvIR.h
@@ -26,8 +28,9 @@ set(SPVREMAP_HEADERS
     doc.h)
 
 if(ENABLE_AMD_EXTENSIONS)
-    set(HEADERS
-        GLSL.ext.AMD.h)
+    list(APPEND
+         HEADERS
+         GLSL.ext.AMD.h)
 endif(ENABLE_AMD_EXTENSIONS)
 
 add_library(SPIRV STATIC ${SOURCES} ${HEADERS})