Added missing tonemapping vertex shader

neo/shaders/builtin/post/tonemapping.vs.hlsl

@@ -0,0 +1,33 @@
+/*
+* Copyright (c) 2014-2021, NVIDIA CORPORATION. All rights reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a
+* copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,
+* and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+* DEALINGS IN THE SOFTWARE.
+*/
+
+void main(
+	in uint iVertex : SV_VertexID,
+	out float4 o_posClip : SV_Position,
+	out float2 o_uv : UV )
+{
+	uint u = iVertex & 1;
+	uint v = ( iVertex >> 1 ) & 1;
+
+	o_posClip = float4( float( u ) * 2 - 1, 1 - float( v ) * 2, QUAD_Z, 1 );
+	o_uv = float2( u, v );
+}