//**************************************************************************/
// Copyright 2012 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"

// Color texture. Assumed to be 4 channel
uniform texture2D gColorTex : SourceTexture
<
    string UIName = "Color Texture";
>;
// Color texture sampler.
uniform sampler2D gColorSampler = sampler_state
{
    Texture = <gColorTex>;
};

// Disable alpha output.
uniform bool gDisableAlpha;

// Depth texture. Assumed to be 1 channel normalized between 0 and 1
uniform texture2D gDepthTex : SourceTexture2
<
    string UIName = "Depth Texture";
>;
// Depth texture sampler.
uniform sampler2D gDepthSampler = sampler_state
{
    Texture = <gDepthTex>;
};


// Pixel shader for color + depth
//
GLSLShader PS_BlitColorDepth
{
	void main()
	{
		// Output color
		//
		vec2 uv = VSUV;
		uv.y = 1.0 - uv.y;

		colorOut = texture2D(gColorSampler, uv); 
		if (gDisableAlpha)
		{
			colorOut.a = 1.0;
		}

		// Output depth
		//
		vec4 depth = texture2D(gDepthSampler, uv); 
		gl_FragDepth = depth.r;
	}
}

// Debug depth to color. Assumes a R32 single channel texture.
//
GLSLShader PS_BlitDepthToColor
{
	void main()
	{
		vec2 uv = VSUV;
		uv.y = 1.0 - uv.y;

		vec4 depth = texture2D(gDepthSampler, uv); 
		colorOut = vec4(depth.r, depth.r, depth.r, 1.0);
	}
}

// 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_BlitColorDepth;
    }
}

// Debug by putting depth to color
technique DepthToColor
{
    pass p0
    {
        VertexShader (in VS_INPUT_ScreenQuad, out VS_TO_PS_ScreenQuad) = VS_ScreenQuad;
        PixelShader (in VS_TO_PS_ScreenQuad, out pixelOut) = PS_BlitDepthToColor;
    }
}