//**************************************************************************/
// Copyright 2013 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.
//**************************************************************************/

// World-view-projection transformation.
uniform mat4 gWVPXf : WorldViewProjection ;

// The single filter input, i.e. the image to be filtered.
uniform texture2D gInputTex : InputTexture;

// Filter input sampler.
uniform sampler2D gInputSampler = sampler_state
{
    Texture = <gInputTex>;
};

// Disable alpha output.
uniform bool gDisableAlpha;

// Flip in V
uniform bool gVerticalFlip = false;

// Vertex shader input structure.
attribute VS_INPUT
{
    vec4 Pos : POSITION;
    vec3 UV : TEXCOORD0;
}

// Vertex shader output structure.
attribute pixelOut
{
    vec4 colorOut: COLOR0;
}
attribute VS_TO_PS
{
    vec3 VSUV : TEXCOORD0;
}

// Vertex shader.
GLSLShader VS_Copy
{
    void main()
    {
        // Transform the position from object space to clip space for output.
        gl_Position = gWVPXf * Pos;

        // Pass the texture coordinates.
        VSUV  = gVerticalFlip ? vec3( UV[0], 1.0 - UV[1], UV[2] ) : UV;
    }
}

// Pixel shader.
GLSLShader PS_Copy
{
    void main()
    {
        vec4 outColor = texture2D(gInputSampler, VSUV.xy);
        vec4 result;
        if(gDisableAlpha)
        {
            result = vec4( outColor.xyz, 1.0 );
        }
        else
        {
            result = outColor;
        }

        colorOut = result;
    }
}

// The main technique.
technique Main
{
    pass p0
    {
        VertexShader (in VS_INPUT, out VS_TO_PS) = VS_Copy;
        PixelShader (in VS_TO_PS, out pixelOut) = PS_Copy;
    }
}