/*********************************************************************NVMH3****
File:  $Id: //sw/devtools/SDK/9.5/SDK/MEDIA/HLSL/post_kuwahara.fx#3 $

Copyright NVIDIA Corporation 2004
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THIS SOFTWARE IS PROVIDED
*AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS
BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES
WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS)
ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF NVIDIA HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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

float Script : STANDARDSGLOBAL <
	string UIWidget = "none";
	string ScriptClass = "scene";
	string ScriptOrder = "postprocess";
	string ScriptOutput = "color";
	string Script = "Technique=Edges;";
> = 0.8; // version #

float4 ClearColor <
	string UIWidget = "color";
	string UIName = "background";
> = {0,0,0,0.0};

float ClearDepth <string UIWidget = "none";> = 1.0;

#include <include\\Quad.fxh>

///////////////////////////////////////////////////////////
/////////////////////////////////////// Tweakables ////////
///////////////////////////////////////////////////////////

half NPixels <
    string UIName = "Pixels Steps";
    string UIWidget = "slider";
    half UIMin = 1.0f;
    half UIMax = 5.0f;
    half UIStep = 0.5f;
> = 1.5f;

half Threshhold
<
    string UIWidget = "slider";
    half UIMin = 0.01f;
    half UIMax = 0.5f;
    half UIStep = 0.01f;
> = 0.2;

///////////////////////////////////////////////////////////
///////////////////////////// Render-to-Texture Data //////
///////////////////////////////////////////////////////////

DECLARE_QUAD_TEX(SceneTexture,SceneSampler,"X8R8G8B8")

DECLARE_QUAD_DEPTH_BUFFER(DepthBuffer, "D24S8")

//////////////////////////////////////////////////////
////////////////////////////////// pixel shaders /////
//////////////////////////////////////////////////////

half getGray(half4 c)
{
    return(dot(c.rgb,((0.33333).xxx)));
}

#define GrabPix(n,a) half3 n = tex2D(ColorMap,(a)).xyz;

half4 edgeDetectPS(QuadVertexOutput IN,
	uniform sampler2D ColorMap
) : COLOR {
	half2 ox = half2(NPixels/QuadScreenSize.x,0.0);
	half2 oy = half2(0.0,NPixels/QuadScreenSize.y);
	half2 ox2 = 2 * ox;
	half2 oy2 = 2 * oy;
	half2 PP = IN.UV.xy - oy2;
	GrabPix(c00,PP-ox2)
	GrabPix(c01,PP-ox)
	GrabPix(c02,PP)
	GrabPix(c03,PP+ox)
	GrabPix(c04,PP+ox2)
	PP = IN.UV.xy - oy;
	GrabPix(c10,PP-ox2)
	GrabPix(c11,PP-ox)
	GrabPix(c12,PP)
	GrabPix(c13,PP+ox)
	GrabPix(c14,PP+ox2)
	PP = IN.UV.xy;
	GrabPix(c20,PP-ox2)
	GrabPix(c21,PP-ox)
	GrabPix(c22,PP)
	GrabPix(c23,PP+ox)
	GrabPix(c24,PP+ox2)
	half3 m00 = (c00+c01+c02 + c10+c11+c12 + c20+c21+c22)/9;
	half3 d = (c00 - m00); half v00 = dot(d,d);
	d = (c01 - m00); v00 += dot(d,d);
	d = (c02 - m00); v00 += dot(d,d);
	d = (c10 - m00); v00 += dot(d,d);
	d = (c11 - m00); v00 += dot(d,d);
	d = (c12 - m00); v00 += dot(d,d);
	d = (c20 - m00); v00 += dot(d,d);
	d = (c21 - m00); v00 += dot(d,d);
	d = (c12 - m00); v00 += dot(d,d);
	half3 m01 = (c02+c03+c04 + c12+c13+c14 + c22+c23+c24)/9;
	d = (c02 - m01); half v01 = dot(d,d);
	d = (c03 - m01); v01 += dot(d,d);
	d = (c04 - m01); v01 += dot(d,d);
	d = (c12 - m01); v01 += dot(d,d);
	d = (c13 - m01); v01 += dot(d,d);
	d = (c14 - m01); v01 += dot(d,d);
	d = (c22 - m01); v01 += dot(d,d);
	d = (c23 - m01); v01 += dot(d,d);
	d = (c14 - m01); v01 += dot(d,d);
	PP = IN.UV.xy + oy;
	GrabPix(c30,PP-ox2)
	GrabPix(c31,PP-ox)
	GrabPix(c32,PP)
	GrabPix(c33,PP+ox)
	GrabPix(c34,PP+ox2)
	PP = IN.UV.xy + oy;
	GrabPix(c40,PP-ox2)
	GrabPix(c41,PP-ox)
	GrabPix(c42,PP)
	GrabPix(c43,PP+ox)
	GrabPix(c44,PP+ox2)
	half3 m10 = (c20+c21+c22 + c30+c31+c32 + c40+c41+c42)/9;
	d = (c20 - m00); half v10 = dot(d,d);
	d = (c21 - m00); v00 += dot(d,d);
	d = (c22 - m00); v00 += dot(d,d);
	d = (c30 - m00); v00 += dot(d,d);
	d = (c31 - m00); v00 += dot(d,d);
	d = (c32 - m00); v00 += dot(d,d);
	d = (c40 - m00); v00 += dot(d,d);
	d = (c41 - m00); v00 += dot(d,d);
	d = (c42 - m00); v00 += dot(d,d);
	half3 m11 = (c22+c23+c24 + c32+c33+c34 + c42+c43+c44)/9;
	d = (c22 - m01); half v11 = dot(d,d);
	d = (c23 - m01); v01 += dot(d,d);
	d = (c24 - m01); v01 += dot(d,d);
	d = (c32 - m01); v01 += dot(d,d);
	d = (c33 - m01); v01 += dot(d,d);
	d = (c34 - m01); v01 += dot(d,d);
	d = (c42 - m01); v01 += dot(d,d);
	d = (c43 - m01); v01 += dot(d,d);
	d = (c44 - m01); v01 += dot(d,d);

	half3 result = m00;
	half rv = v00;
	if (v01 < rv) { result = m01; rv = v01; }
	if (v10 < rv) { result = m10; rv = v10; }
	if (v11 < rv) { result = m11; }
	return half4(result,1);
}

////////////////////////////////////////////////////////////
/////////////////////////////////////// techniques /////////
////////////////////////////////////////////////////////////

technique Edges <
	string ScriptClass = "scene";
	string ScriptOrder = "postprocess";
	string ScriptOutput = "color";
	string Script =
			"RenderColorTarget0=SceneTexture;"
	        "RenderDepthStencilTarget=DepthBuffer;"
	        	"ClearSetColor=ClearColor;"
	        	"ClearSetDepth=ClearDepth;"
   				"Clear=Color;"
				"Clear=Depth;"
	        	"ScriptExternal=color;"
        	"Pass=ImageProc;";
> {
    pass ImageProc <
    	string Script = "RenderColorTarget0=;"
								"Draw=Buffer;";
    > {
		cullmode = none;
		ZEnable = false;
		ZWriteEnable = false;
		VertexShader = compile vs_2_0 ScreenQuadVS();
		PixelShader = compile ps_2_b edgeDetectPS(SceneSampler);
    }
}

////////////// eof ///