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

Copyright   :   Copyright 2014 Oculus VR, LLC. All Rights reserved.

Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");
you may not use the Oculus VR Rift SDK except in compliance with the License,
which is provided at the time of installation or download, or which
otherwise accompanies this software in either electronic or hard copy form.

You may obtain a copy of the License at

http://www.oculusvr.com/licenses/LICENSE-3.2

Unless required by applicable law or agreed to in writing, the Oculus VR SDK
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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

Shader "OVRGUIShader" 
{
	Properties { _MainTex ("Texture", any) = "" {} } 

	SubShader {

		Tags { "ForceSupported" = "True" "RenderType"="Overlay" "Queue"="Overlay" } 
		
		Lighting Off 
		Blend One OneMinusSrcAlpha 
		Cull Off 
		ZWrite Off 
		Fog { Mode Off } 
		ZTest Always 
		
		Pass {	
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma fragmentoption ARB_precision_hint_fastest

			#include "UnityCG.cginc"

			struct appdata_t {
				float4 vertex : POSITION;
				fixed4 color : COLOR;
				float2 texcoord : TEXCOORD0;
			};

			struct v2f {
				float4 vertex : POSITION;
				fixed4 color : COLOR;
				float2 texcoord : TEXCOORD0;
			};

			sampler2D _MainTex;

			uniform float4 _MainTex_ST;
			
			v2f vert (appdata_t v)
			{
				v2f o;
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.color = v.color;
				o.texcoord = TRANSFORM_TEX(v.texcoord,_MainTex);
				return o;
			}

			fixed4 frag (v2f i) : COLOR
			{
				return 2.0f * tex2D(_MainTex, i.texcoord) * i.color;
			}
			ENDCG 
		}
	} 	
 
	
	SubShader { 

		Tags { "ForceSupported" = "True" "RenderType"="Overlay" } 

		Lighting Off 
		Blend SrcAlpha OneMinusSrcAlpha 
		Cull Off 
		ZWrite Off 
		Fog { Mode Off } 
		ZTest Always 
		
		BindChannels { 
			Bind "vertex", vertex 
			Bind "color", color 
			Bind "TexCoord", texcoord 
		} 
		
		Pass { 
			SetTexture [_MainTex] {
				combine primary * texture DOUBLE, primary * texture DOUBLE
			} 
		} 
	} 

	Fallback off 
}