/*
-----------------------------------------------------------------------------
This source is part of the Stereoscopy manager for OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/
-----------------------------------------------------------------------------
* Copyright (c) 2008, Mathieu Le Ber, AXYZ-IMAGES
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright
*       notice, this list of conditions and the following disclaimer in the
*       documentation and/or other materials provided with the distribution.
*     * Neither the name of the AXYZ-IMAGES nor the
*       names of its contributors may be used to endorse or promote products
*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Mathieu Le Ber ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Mathieu Le Ber BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------------
*/

float4 Interlace_fp
(
	// input
	in float2 texCoord : TEXCOORD0,
	
	// parameters
	uniform float4 screenSize,
	uniform sampler2D LeftTex : register(s0),
	uniform sampler2D RightTex : register(s1)

) : COLOR
{
	// return 0 if the pixel position is even or 1 if it is odd 
	float2 p = step(0.5f, frac(texCoord * screenSize.xy * 0.5f));
	float4 left = tex2D(LeftTex, texCoord);
	float4 right = tex2D(RightTex, texCoord);
	
	#ifndef HORIZ
	p.y = 1;
	#endif
	#ifndef VERT
	p.x = 1;
	#endif
	
	float f = (p.x == p.y);  // 1-abs(p.x-p.y)
	return lerp(left, right, f);
}


float4 Anaglyph_fp
(
	// input
	in float2 texCoord : TEXCOORD0,
	
	// parameters
	uniform sampler2D LeftTex : register(s0),
	uniform sampler2D RightTex : register(s1)

) : COLOR
{
	float4 left = tex2D(LeftTex, texCoord);
	float4 right = tex2D(RightTex, texCoord);
	
//	return float4(left.r, right.g, right.b, 1);
	return left * float4(LEFT_MASK) + right * float4(RIGHT_MASK);
}