/************************************************************************************

Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.

See SampleFramework license.txt for license terms.  Unless required by applicable law
or agreed to in writing, the sample code is provided “AS IS” WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.  See the license for specific
language governing permissions and limitations under the license.

************************************************************************************/


Shader "Oculus Sample/Button Glow" {
  Properties{
    _ColorMask("Texture", 2D) = "white" {}
    _Color("Color", Color) = (0.5, 0.5, 0.5, 0.5)
  }
   SubShader {
    Tags{"Queue" = "Transparent" "RenderType" = "Transparent"
         "IgnoreProjector" = "True" "PreviewType" = "Plane"}
    LOD 100 Blend SrcAlpha OneMinusSrcAlpha Cull Off Lighting Off ZWrite Off

    Pass {
      CGPROGRAM
      #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 vertex : SV_POSITION;

        UNITY_VERTEX_OUTPUT_STEREO
      };

      sampler2D _ColorMask;
      float4 _ColorMask_ST;
      fixed4 _Color;

      v2f vert(appdata v) {
        v2f o;

        UNITY_SETUP_INSTANCE_ID(v);
        UNITY_INITIALIZE_OUTPUT(v2f, o);
        UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);

        o.vertex = UnityObjectToClipPos(v.vertex);
        o.uv = TRANSFORM_TEX(v.uv, _ColorMask);
        return o;
      }

      fixed4 frag(v2f i) : SV_Target {
        fixed4 colMask = tex2D(_ColorMask, i.uv);
        return fixed4(_Color.rgb, colMask.r * 1.0);
      }
      ENDCG
    }
  }
}