stereo-instancing-test.shader

        Pass
        {
            CGPROGRAM

			#pragma multi_compile_instancing

            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
				UNITY_VERTEX_INPUT_INSTANCE_ID
			};

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 grabPos : TEXCOORD1;
                float4 pos : SV_POSITION;
				UNITY_VERTEX_INPUT_INSTANCE_ID
				UNITY_VERTEX_OUTPUT_STEREO
            };

            v2f vert(appdata v) {
				v2f o;
				UNITY_INITIALIZE_OUTPUT(v2f, o);
				UNITY_SETUP_INSTANCE_ID(v);
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
                o.pos = UnityObjectToClipPos(v.vertex);
                o.grabPos = ComputeGrabScreenPos(o.pos);
                return o;
            }

            sampler2D _BackgroundTexture;

            half4 frag(v2f i) : SV_Target
            {
				UNITY_SETUP_INSTANCE_ID(i);
				UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);

			#ifdef UNITY_STEREO_INSTANCING_ENABLED
			#endif

				half4 bgcolor = tex2D(_BackgroundTexture, i.grabPos / i.grabPos.w);
                return 1 - bgcolor;
            }
            ENDCG