Add a new property to LinkedUniform struct

The new property isTransformedFloat will be used by front end
API to determine if we should transform 32-bit float to 16-bit float
before writing to memory, and transform 16-bit float to 32-bit float
after reading from memory. The property value will be passed from
UsedUniform (child struct of ShaderVariable) object in
UniformLinkder::getResults().

This CL is no op.

Bug: angleproject:405795981
Change-Id: Ic4908712f5fa56cb657206a25d9d618b51ac6322
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6851554
Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Yuxin Hu <yuxinhu@google.com>

Author: HuYuxin

src/libANGLE/Uniform.cpp

@@ -77,6 +77,7 @@ LinkedUniform::LinkedUniform(const UsedUniform &usedUniform)
 
     SetBitField(pod.flagBits.isFragmentInOut, usedUniform.isFragmentInOut);
     SetBitField(pod.flagBits.texelFetchStaticUse, usedUniform.texelFetchStaticUse);
+    SetBitField(pod.flagBits.isFloat16, usedUniform.isFloat16);
     ASSERT(!usedUniform.isArray() || pod.arraySize == usedUniform.getArraySizeProduct());
 }
 

src/libANGLE/Uniform.h

@@ -128,6 +128,7 @@ struct LinkedUniform
     int getBufferIndex() const { return pod.bufferIndex; }
     int getLocation() const { return pod.location; }
     GLenum getImageUnitFormat() const { return pod.imageUnitFormat; }
+    bool isFloat16() const { return pod.flagBits.isFloat16; }
 
     ACTIVE_VARIABLE_COMMON_INTERFACES
 
@@ -166,7 +167,8 @@ struct LinkedUniform
                 uint8_t isArray : 1;
                 uint8_t blockIsRowMajorMatrix : 1;
                 uint8_t isBlock : 1;
-                uint8_t padding : 3;
+                uint8_t isFloat16 : 1;
+                uint8_t padding : 2;
             } flagBits;
             uint8_t flagBitsAsUByte;
         };