//**************************************************************************/
// Copyright 2014 Autodesk, Inc.
// All rights reserved.
// Use of this software is subject to the terms of the Autodesk license
// agreement provided at the time of installation or download, or which
// otherwise accompanies this software in either electronic or hard copy form.
//**************************************************************************/

#include "Common.ogsfh"

// The source texture
uniform texture2D gSourceTex : SourceTexture;

// Sampler of source texture
uniform sampler2D gSourceSamp = sampler_state
{
    Texture = <gSourceTex>;
};

// The 2nd source texture
uniform texture2D gSourceTex2 : SourceTexture2;

// Sampler of 2nd source texture
uniform sampler2D gSourceSamp2 = sampler_state
{
    Texture = <gSourceTex2>;
};

// Amount to blend source
uniform float gBlendSrc = 0.3f;
uniform vec4 gUVTransform : RelativeViewportDimensions;

GLSLShader PS_Blend
{
	void main()
	{
		vec4 source = texture2D(gSourceSamp, VSUV * gUVTransform.zw + gUVTransform.xy);
		vec4 source2 = texture2D(gSourceSamp2, VSUV * gUVTransform.zw + gUVTransform.xy);
		vec4 result = vec4( lerp(source2, source, gBlendSrc).xyz, source.a);		

        colorOut = result;
	}
}

GLSLShader PS_AlphaBlend
{
	void main()
	{
		vec4 source = texture2D(gSourceSamp, VSUV * gUVTransform.zw + gUVTransform.xy);
		vec4 source2 = texture2D(gSourceSamp2, VSUV * gUVTransform.zw + gUVTransform.xy);
		vec4 result = lerp(source2, source, source.a);

        colorOut = result;
	}
}


GLSLShader PS_Add
{
	void main()
	{
		vec4 source = texture2D(gSourceSamp, VSUV * gUVTransform.zw + gUVTransform.xy);
		vec4 source2 = texture2D(gSourceSamp2, VSUV * gUVTransform.zw + gUVTransform.xy);
		vec4 result = source2 + source;

        colorOut = result;
	}
}


// The main technique.
technique Main
{
    pass p0
    {
        VertexShader (in VS_INPUT_ScreenQuad, out VS_TO_PS_ScreenQuad) = VS_ScreenQuad;
        PixelShader (in VS_TO_PS_ScreenQuad, out pixelOut) = PS_Blend;
    }
}

technique AlphaBlend
{
    pass p0
    {
        VertexShader (in VS_INPUT_ScreenQuad, out VS_TO_PS_ScreenQuad) = VS_ScreenQuad;
        PixelShader (in VS_TO_PS_ScreenQuad, out pixelOut) = PS_AlphaBlend;
    }
}

technique Add
{
    pass p0
    {
        VertexShader (in VS_INPUT_ScreenQuad, out VS_TO_PS_ScreenQuad) = VS_ScreenQuad;
        PixelShader (in VS_TO_PS_ScreenQuad, out pixelOut) = PS_Add;
    }
}