Added vertex attribute types

Added a few types:
- Half float
- 2_10_10_10_INT
- 2_10_10_10_UINT

Related dEQP tests pass.

Change-Id: I2fb04fee89c3d69367dc2e401ac53d9758add9bf
Reviewed-on: https://swiftshader-review.googlesource.com/5356
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/OpenGL/libGLESv2/Context.h

diff --git a/src/OpenGL/libGLESv2/Context.h b/src/OpenGL/libGLESv2/Context.h
index 94b8fe8..6477734 100644
--- a/src/OpenGL/libGLESv2/Context.h
+++ b/src/OpenGL/libGLESv2/Context.h
@@ -210,6 +210,9 @@
 		case GL_UNSIGNED_INT:   return mSize * sizeof(GLuint);
 		case GL_FIXED:          return mSize * sizeof(GLfixed);
 		case GL_FLOAT:          return mSize * sizeof(GLfloat);
+		case GL_HALF_FLOAT:     return mSize * sizeof(GLhalf);
+		case GL_INT_2_10_10_10_REV:          return sizeof(GLint);
+		case GL_UNSIGNED_INT_2_10_10_10_REV: return sizeof(GLuint);
 		default: UNREACHABLE(mType); return mSize * sizeof(GLfloat);
 		}
 	}