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File:  $Id: //sw/devrel/SDK/MEDIA/HLSL/goochy_shadow.fx#4 $



Copyright NVIDIA Corporation 2002-2004

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.





Comments:

	Gooch shading w/glossy hilight in HLSL ps_2 pixel shader.



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



#define MAX_SHADOW_BIAS 0.003

#define SHADOW_SIZE 1024

#include <include\\shadowMap.fxh>

#include <include\\spot_tex.fxh>



float Script : STANDARDSGLOBAL <

    string UIWidget = "none";

    string ScriptClass = "sceneorobject";

    string ScriptOrder = "standard";

    string ScriptOutput = "color";

    string Script = "Technique=Technique?Main:Unshadowed;";

> = 0.8;



float4 ClearColor <

	string UIWidget = "color";

	string UIName = "background";

> = {0,0,0,0.0};



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



/************* TWEAKABLES **************/



float4x4 WorldITXf : WorldInverseTranspose < string UIWidget="None"; >;

float4x4 WorldViewProjXf : WorldViewProjection < string UIWidget="None"; >;

float4x4 WorldViewXf : WorldView < string UIWidget="None"; >; // no projection

float4x4 WorldXf : World < string UIWidget="None"; >;

float4x4 ViewIXf : ViewInverse < string UIWidget="None"; >;

float4x4 ViewITXf : ViewInverseTranspose <string UIWidget="None";>;



DECLARE_SHADOW_XFORMS("light0",LampViewXf,LampProjXf,ShadowViewProjXf)

DECLARE_SHADOW_BIAS

DECLARE_SHADOW_MAPS(ColorShadMap,ColorShadSampler,ShadDepthTarget,ShadDepthSampler)



///////////////////////////////////////////////////////////////

/// TWEAKABLES ////////////////////////////////////////////////

///////////////////////////////////////////////////////////////



float3 SpotLightPos : POSITION <

	string UIName = "Light Posistion";

	string Object = "SpotLight";

	string Space = "World";

> = {-1.0f, 1.0f, 0.0f};



/////////////////////////////



float3 LiteColor <

    string UIName =  "Bright Surface Color";

    string UIWidget = "Color";

> = {0.8f, 0.5f, 0.1f};



float3 DarkColor <

    string UIName =  "Dark Surface Color";

    string UIWidget = "Color";

> = {0.0f, 0.0f, 0.0f};



float3 WarmColor <

    string UIName =  "Gooch warm tone";

    string UIWidget = "Color";

> = {0.5f, 0.4f, 0.05f};



float3 CoolColor <

    string UIName =  "Gooch cool tone";

    string UIWidget = "Color";

> = {0.05f, 0.05f, 0.6f};



float3 SpecColor : Specular <

    string UIName =  "Hilight color";

    string UIWidget = "Color";

> = {0.7f, 0.7f, 1.0f};



float SpecExpon : SpecularPower <

    string UIWidget = "slider";

    float UIMin = 1.0;

    float UIMax = 128.0;

    float UIStep = 1.0;

    string UIName =  "specular power";

> = 40.0;



float GlossTop <

    string UIWidget = "slider";

    float UIMin = 0.2;

    float UIMax = 1.0;

    float UIStep = 0.05;

    string UIName =  "Maximum for Gloss Dropoff";

> = 0.7;



float GlossBot

<

    string UIWidget = "slider";

    float UIMin = 0.05;

    float UIMax = 0.95;

    float UIStep = 0.05;

    string UIName =  "Minimum for Gloss Dropoff";

> = 0.5;



float GlossDrop

<

    string UIWidget = "slider";

    float UIMin = 0.0;

    float UIMax = 1.0;

    float UIStep = 0.05;

    string UIName =  "Strength of Glossy Dropoff";

> = 0.2;



float StripeScale

<

    string UIWidget = "slider";

    float UIMin = 1.0;

    float UIMax = 100.0;

    float UIStep = 0.05;

   // string UIName =  "Strength of Glossy Dropoff";

> = 50.0;



float StripeDens

<

    string UIWidget = "slider";

    float UIMin = 0.1;

    float UIMax = 0.9;

    float UIStep = 0.001;

   // string UIName =  "Strength of Glossy Dropoff";

> = 0.25;



float StripeRotation

<

    string UIWidget = "slider";

    float UIMin = -180.0;

    float UIMax = 180.0;

    float UIStep = 0.05;

   // string UIName =  "Strength of Glossy Dropoff";

> = 73.0;

static float SR = radians(StripeRotation);

static float cr = cos(SR);

static float sr = sin(SR);



/////////////// prodecural texture for shadowing /////////////



#define TEX_SIZE 64



float4 stripe_function(float2 Pos : POSITION,float ps : PSIZE) : COLOR

{

   float v = 0;

   float nx = Pos.x+ps; // keep the last column full-on, always

   v = nx > Pos.y;

   return float4(v.xxxx);

}



texture stripeTex <

    string function = "stripe_function";

    string UIWidget = "None";

    float2 Dimensions = { TEX_SIZE, TEX_SIZE };

>;



sampler2D stripeSampler = sampler_state

{

    Texture = <stripeTex>;

    MinFilter = LINEAR;

    MagFilter = LINEAR;

    MipFilter = LINEAR;

    AddressU = WRAP;

    AddressV = CLAMP;

};



////////////////// struct



//

// Connector from vertex to pixel shader for typical usage. The

//		"LProj" member is the crucial one for shadow mapping.

//

struct GoochShadVertexOutput {

    float4 HPosition	: POSITION;

    float2 UV		: TEXCOORD0;

    float3 LightVec	: TEXCOORD1;

    float3 WNormal	: TEXCOORD2;

    float3 WView	: TEXCOORD3;

    float4 LProj	: TEXCOORD4;	// current position in light-projection space

    float2 HatchPos	: TEXCOORD5;	// in scaled/rotated screen space

};



////////////////// vertex shader -- like shadowMap.fxh's shadowUseVS but with additional "HatchPos" output field



GoochShadVertexOutput goochShadVS(ShadowAppData IN,

		uniform float4x4 WorldXform,

		uniform float4x4 WorldITXform,

		uniform float4x4 WVPXform,

		uniform float4x4 ShadowVPXform,

		uniform float4x4 ViewIXform,

		uniform float4x4 BiasXform,

		uniform float3 LightPosition) {

    GoochShadVertexOutput OUT = (GoochShadVertexOutput)0;

    OUT.WNormal = mul(IN.Normal,WorldITXform).xyz; // world coords

    float4 Po = float4(IN.Position.xyz,(float)1.0);	// "P" in object coordinates

    float4 Pw = mul(Po,WorldXform);			// "P" in world coordinates

    float4 Pl = mul(Pw,ShadowVPXform);  // "P" in light coords

    //OUT.LProj = Pl;							// ...for pixel-shader shadow calcs

    OUT.LProj = mul(Pl,BiasXform);				// bias to make texcoord

    //

    OUT.WView = normalize(ViewIXform[3].xyz - Pw.xyz);	// world coords

    float4 Ph = mul(Po,WVPXform);		// screen clipspace coords

    OUT.HPosition = Ph;

    OUT.UV = IN.UV.xy;							// pass-thru

    OUT.LightVec = LightPosition - Pw.xyz;		// world coords

	float2 simpleStripe = StripeScale * float2(Ph.x*cr - Ph.y*sr, Ph.x*sr+Ph.y*cr);

	OUT.HatchPos = float2(simpleStripe.x/Ph.w,StripeDens);

    return OUT;

}



/*********** pixel shader ******/



void gooch_shared(GoochShadVertexOutput IN,

		out float4 DiffuseContrib,

		out float4 SpecularContrib)

{

    float3 Ln = normalize(IN.LightVec);

    float3 Nn = normalize(IN.WNormal);

    float3 Vn = normalize(IN.WView);

    Nn = faceforward(Nn,-Vn,Nn);

    float3 Hn = normalize(Vn + Ln);

    float hdn = pow(max(0,dot(Hn,Nn)),SpecExpon);

    hdn = hdn * (GlossDrop+smoothstep(GlossBot,GlossTop,hdn)*(1.0-GlossDrop));

    SpecularContrib = float4((hdn * SpecColor),1);

    float ldn = dot(Ln,Nn);

    float mixer = 0.5 * (ldn + 1.0);

    float diffComp = max(0,ldn);

    float3 surfColor = lerp(DarkColor,LiteColor,mixer);

    float3 toneColor = lerp(CoolColor,WarmColor,mixer);

    DiffuseContrib = float4((surfColor + toneColor),1);

}



float4 gooch_PS_unshadowed(GoochShadVertexOutput IN) :COLOR

{

	float4 diffContrib;

	float4 specContrib;

	gooch_shared(IN,diffContrib,specContrib);

    float4 result = diffContrib + specContrib;

    return result;

}



float4 gooch_PS_noshad(GoochShadVertexOutput IN) :COLOR

{

	float4 diffContrib;

	float4 specContrib;

	gooch_shared(IN,diffContrib,specContrib);

    float4 result = diffContrib + specContrib;

    return result;

}



float4 gooch_PS_shad(GoochShadVertexOutput IN) :COLOR

{

	float4 diffContrib;

	float4 specContrib;

	gooch_shared(IN,diffContrib,specContrib);

    float4 shadowed = tex2Dproj(ShadDepthSampler,IN.LProj);

    float stripes = tex2D(stripeSampler,IN.HatchPos.xy).x;

    float4 result = (diffContrib + specContrib)*max(stripes,shadowed);

    return  result;

}



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



technique Main <

	string Script = "Pass=MakeShadow;"

					"Pass=UseShadow;";

> {

	pass MakeShadow <

		string Script = "RenderColorTarget0=ColorShadMap;"

						"RenderDepthStencilTarget=ShadDepthTarget;"

						"RenderPort=light0;"

						"ClearSetColor=ClearColor;"

						"ClearSetDepth=ClearDepth;"

						"Clear=Color;"

						"Clear=Depth;"

						"Draw=geometry;";

	> {

		VertexShader = compile vs_2_0 shadowGenVS(WorldXf,WorldITXf,ShadowViewProjXf);

		ZEnable = true;

		ZWriteEnable = true;

		ZFunc = LessEqual;

		CullMode = None;

		// no pixel shader

	}

	pass UseShadow <

		string Script = "RenderColorTarget0=;"

						"RenderDepthStencilTarget=;"

						"RenderPort=;"

						"ClearSetColor=ClearColor;"

						"ClearSetDepth=ClearDepth;"

						"Clear=Color;"

						"Clear=Depth;"

						"Draw=geometry;";

	> {

		VertexShader = compile vs_2_0 goochShadVS(WorldXf,WorldITXf, WorldViewProjXf,

								ShadowViewProjXf,ViewIXf,ShadBiasXf, SpotLightPos);

		ZEnable = true;

		ZWriteEnable = true;

		ZFunc = LessEqual;

		CullMode = None;

		PixelShader = compile ps_2_a gooch_PS_shad();

	}

}



technique Unshadowed <

	string Script = "Pass=UseShadow;";

> {

	pass UseShadow <

		string Script = "RenderColorTarget0=;"

						"RenderDepthStencilTarget=;"

						"RenderPort=;"

						"ClearSetColor=ClearColor;"

						"ClearSetDepth=ClearDepth;"

						"Clear=Color;"

						"Clear=Depth;"

						"Draw=geometry;";

	> {

		VertexShader = compile vs_2_0 goochShadVS(WorldXf,WorldITXf, WorldViewProjXf,

								ShadowViewProjXf,ViewIXf,ShadBiasXf, SpotLightPos);

		ZEnable = true;

		ZWriteEnable = true;

		ZFunc = LessEqual;

		CullMode = None;

		PixelShader = compile ps_2_a gooch_PS_noshad();

	}

}



/***************************** eof ***/

]]></effect><effect path="f:\devrel\sdk\media\hlsl\include\\quad.fxh"><![CDATA[/*********************************************************************NVMH3****

File:  $Id: //sw/devrel/SDK/MEDIA/HLSL/include/Quad.fxh#1 $



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.



Comments:

    Header file with lots of useful macros, types, and functions for use

		with textures and render-to-texture-buffer effects in DirectX.



Example Macro Usages:

	Texture-declaration Macros:

		FILE_TEXTURE_2D(SurfTexture,SurfSampler,"myfile.dds") // simple 2D wrap texture

		FILE_TEXTURE_2D_MODAL(SpotTexture,SpotSampler,"myfile.dds",CLAMP) // user-defined addr mode

	RenderTarget Texture-declaration Macros:

		DECLARE_QUAD_TEX(ObjTexture,ObjSampler,"A8R8G8B8")

		DECLARE_QUAD_DEPTH_BUFFER(DepthTexture,"D24S8")

		DECLARE_SIZED_QUAD_TEX(GlowTexture,GlowSampler,"A8R8G8B8",0.5) // scaled versions of above

		DECLARE_SIZED_QUAD_DEPTH_BUFFER(DepthTexture,"D24S8",0.5)

		DECLARE_SIZED_TEX(BlahMap,BlahSampler,"R32F",128,1)	// address mode is "clamp"

		DECLARE_SQUARE_QUAD_TEX(ShadTexture,ShadObjSampler,"A16R16G16B16F",512) // for shadows etc

		DECLARE_SQUARE_QUAD_DEPTH_BUFFER(ShadDepth,"D24S8",512)

	Data types used in shaders:

		QUAD_REAL & QUAD_REAL# -- defaults to HALF but you can define QUAD_REAL float

			before #including "Quad.fxh" either by explicitly declaring all the QUAD_REAL types

			yourself, or #define-ing the symbol QUAD_FLOAT

	Flags (define before #including "Quad.fxh"):

		TWEAKABLE_TEXEL_OFFSET	// shows in paramter panel

		NO_TEXEL_OFFSET	// disables



Structure:

	QuadVertexOutput -- used by shaders, defines simple connection for "Draw=buffer" VS and PS



Shader Functions for "Draw=buffer" passes:

	QuadVertexOutput ScreenQuadVS():

		standard vertex shader for screen-aligned quads

	QUAD_REAL4 TexQuadPS(QuadVertexOutput IN,uniform sampler2D InputSampler)

		pass this pixel shader a sampler -- will draw it to the screen

	QUAD_REAL4 TexQuadBiasPS(QuadVertexOutput IN,uniform sampler2D InputSampler,QUAD_REAL TBias)

		Same as above, but uses tex2Dbias()



Utility Functions for Texture-Based Lookup Tables:

	QUAD_REAL scale_lookup(QUAD_REAL Value,const QUAD_REAL TableSize)

	QUAD_REAL2 scale_lookup(QUAD_REAL2 Value,const QUAD_REAL TableSize)

	QUAD_REAL3 scale_lookup(QUAD_REAL3 Value,const QUAD_REAL TableSize)

Other Utility Functions:

	QUAD_REAL4 premultiply(QUAD_REAL4 C)

	QUAD_REAL4 unpremultiply(QUAD_REAL4 C) // uses macro value NV_ALPHA_EPSILON



Global Variables:

	QUAD_REAL QuadTexOffset // reconciles difference between pixel and texel centers

	QUAD_REAL2 QuadScreenSize // VIEWPORTPIXELSIZE, contains dimensions of render window



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



#ifndef _QUAD_FXH

#define _QUAD_FXH



// Numeric types we are likely to encounter....

//	Redefine these before including "Quad.fxh" if you want

//		to use a type other than "half" for these data or just

//		define the symbol QUAD_FLOAT to use "floats"

#ifndef QUAD_REAL

#ifdef QUAD_FLOAT

#define QUAD_REAL float

#define QUAD_REAL2 float2

#define QUAD_REAL3 float3

#define QUAD_REAL4 float4

#define QUAD_REAL3x3 float3x3

#define QUAD_REAL4x3 float4x3

#define QUAD_REAL3x4 float3x4

#define QUAD_REAL4x4 float4x4

#else /* ! QUAD_FLOAT */

#define QUAD_REAL half

#define QUAD_REAL2 half2

#define QUAD_REAL3 half3

#define QUAD_REAL4 half4

#define QUAD_REAL3x3 half3x3

#define QUAD_REAL4x3 half4x3

#define QUAD_REAL3x4 half3x4

#define QUAD_REAL4x4 half4x4

#endif /* ! QUAD_FLOAT */

#endif /* ! QUAD_REAL */



///////////////////////////////////////////////////////////////////////

/// Texture-Declaration Macros ////////////////////////////////////////

///////////////////////////////////////////////////////////////////////



//

// Modal 2D File Textures

//

// example usage: FILE_TEXTURE_2D_MODAL(GlowMap,GlowSampler,"myfile.dds",CLAMP)

//

#define FILE_TEXTURE_2D_MODAL(TexName,SampName,Filename,AddrMode) texture TexName < \

	string ResourceName = (Filename); \

    string ResourceType = "2D"; \

>; \

sampler SampName = sampler_state { \

    texture = <TexName>; \

    AddressU  = AddrMode; \

    AddressV = AddrMode; \

    MipFilter = LINEAR; \

    MinFilter = LINEAR; \

    MagFilter = LINEAR; \

};



//

// Simple 2D File Textures

//

// example usage: FILE_TEXTURE_2D(GlowMap,GlowSampler,"myfile.dds")

//

#define FILE_TEXTURE_2D(TextureName,SamplerName,Diskfile) FILE_TEXTURE_2D_MODAL(TextureName,SamplerName,(Diskfile),WRAP)



//

// Use this variation of DECLARE_QUAD_TEX() if you want a *scaled* render target

//

// example usage: DECLARE_SIZED_QUAD_TEX(GlowMap,GlowSampler,"A8R8G8B8",1.0)

#define DECLARE_SIZED_QUAD_TEX(TexName,SampName,PixFmt,Multiple) texture TexName : RENDERCOLORTARGET < \

    float2 ViewPortRatio = {Multiple,Multiple}; \

    int MipLevels = 1; \

    string Format = PixFmt ; \

	string UIWidget = "None"; \

>; \

sampler SampName = sampler_state { \

    texture = <TexName>; \

    AddressU  = CLAMP; \

    AddressV = CLAMP; \

    MipFilter = POINT; \

    MinFilter = LINEAR; \

    MagFilter = LINEAR; \

};



//

// Use this macro to easily declare typical color render targets

//

// example usage: DECLARE_QUAD_TEX(ObjMap,ObjSampler,"A8R8G8B8")

#define DECLARE_QUAD_TEX(TextureName,SamplerName,PixelFormat) DECLARE_SIZED_QUAD_TEX(TextureName,SamplerName,(PixelFormat),1.0)



//

// Use this macro to easily declare variable-sized depth render targets

//

// example usage: DECLARE_SIZED_QUAD_DEPTH_BUFFER(DepthMap,"D24S8",0.5)

#define DECLARE_SIZED_QUAD_DEPTH_BUFFER(TextureName,PixelFormat,Multiple) texture TextureName : RENDERDEPTHSTENCILTARGET < \

    float2 ViewPortRatio = {Multiple,Multiple}; \

    string Format = (PixelFormat); \

	string UIWidget = "None"; \

>; 



//

// Use this macro to easily declare typical depth render targets

//

// example usage: DECLARE_QUAD_DEPTH_BUFFER(DepthMap,"D24S8")

#define DECLARE_QUAD_DEPTH_BUFFER(TexName,PixFmt) DECLARE_SIZED_QUAD_DEPTH_BUFFER(TexName,PixFmt,1.0)



//

// declare exact-sized arbitrary texture

//

// example usage: DECLARE_SIZED_TEX(BlahMap,BlahSampler,"R32F",128,1)

#define DECLARE_SIZED_TEX(Tex,Samp,Fmt,Wd,Ht) texture Tex : RENDERCOLORTARGET < \

	float2 Dimensions = { Wd, Ht }; \

    string Format = Fmt ; \

	string UIWidget = "None"; \

	int miplevels=1;\

>; \

sampler Samp = sampler_state { \

    texture = <Tex>; \

    AddressU  = CLAMP; \

    AddressV = CLAMP; \

    MipFilter = NONE; \

    MinFilter = LINEAR; \

    MagFilter = LINEAR; \

};



//

// declare exact-sized square texture, as for shadow maps

//

// example usage: DECLARE_SQUARE_QUAD_TEX(ShadMap,ShadObjSampler,"A16R16G16B16F",512)

#define DECLARE_SQUARE_QUAD_TEX(TexName,SampName,PixFmt,Size) DECLARE_SIZED_TEX(TexName,SampName,(PixFmt),Size,Size)



//

// likewise for shadow depth targets

//

// example usage: DECLARE_SQUARE_QUAD_DEPTH_BUFFER(ShadDepth,"D24S8",512)

#define DECLARE_SQUARE_QUAD_DEPTH_BUFFER(TextureName,PixelFormat,Size) texture TextureName : RENDERDEPTHSTENCILTARGET < \

	float2 Dimensions = { Size, Size }; \

    string Format = (PixelFormat) ; \

	string UIWidget = "None"; \

>; 



////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////// Utility Functions ////////

////////////////////////////////////////////////////////////////////////////



//

// Scale inputs for use with texture-based lookup tables. A value ranging from zero to one needs

//   a slight scaling and offset to be sure to point at the centers of the first and last pixels

//	 of that lookup texture. Pass the integer size of the table in TableSize

// For now we'll assume that all tables are 1D, square, or cube-shaped -- all axes of equal size

//

// Cost of this operation for pixel shaders: two const-register

//   entries and a MAD (one cycle)

QUAD_REAL scale_lookup(QUAD_REAL Value,const QUAD_REAL TableSize)

{

	QUAD_REAL scale = ((TableSize - 1.0)/TableSize);

	QUAD_REAL shift = (0.5 / TableSize);

	return (scale*Value + shift);

}



QUAD_REAL2 scale_lookup(QUAD_REAL2 Value,const QUAD_REAL TableSize)

{

	QUAD_REAL scale = ((TableSize - 1.0)/TableSize);

	QUAD_REAL shift = (0.5 / TableSize);

	return (scale.xx*Value + shift.xx);

}



QUAD_REAL3 scale_lookup(QUAD_REAL3 Value,const QUAD_REAL TableSize)

{

	QUAD_REAL scale = ((TableSize - 1.0)/TableSize);

	QUAD_REAL shift = (0.5 / TableSize);

	return (scale.xxx*Value + shift.xxx);

}



// pre-multiply and un-pre-mutliply functions. The precision

//		of thse operatoions is often limited to 8-bit so don't

//		always count on them!

// The macro value of NV_ALPHA_EPSILON, if defined, is used to

//		avoid IEEE "NaN" values that may occur when erroneously

//		dividing by a zero alpha (thanks to Pete Warden @ Apple

//		Computer for the suggestion in GPU GEMS II)



// multiply color by alpha to turn an un-premultipied

//	pixel value into a premultiplied one

QUAD_REAL4 premultiply(QUAD_REAL4 C)

{

	return QUAD_REAL4((C.w*C.xyz),C.w);

}



#define NV_ALPHA_EPSILON 0.0001



// given a premultiplied pixel color, try to undo the premultiplication.

// beware of precision errors

QUAD_REAL4 unpremultiply(QUAD_REAL4 C)

{

#ifdef NV_ALPHA_EPSILON

	QUAD_REAL a = C.w + NV_ALPHA_EPSILON;

	return QUAD_REAL4((C.xyz / a),C.w);

#else /* ! NV_ALPHA_EPSILON */

	return QUAD_REAL4((C.xyz / C.w),C.w);

#endif /* ! NV_ALPHA_EPSILON */

}



/////////////////////////////////////////////////////////////////////////////////////

// Structure Declaration ////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////



struct QuadVertexOutput {

   	QUAD_REAL4 Position	: POSITION;

    QUAD_REAL2 UV		: TEXCOORD0;

};



/////////////////////////////////////////////////////////////////////////////////////

// Hidden tweakables declared by this .fxh file /////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////



#ifndef NO_TEXEL_OFFSET



#ifdef TWEAKABLE_TEXEL_OFFSET

		QUAD_REAL QuadTexOffset = 0.5;

#else /* !TWEAKABLE_TEXEL_OFFSET */

		QUAD_REAL QuadTexOffset < string UIWidget="None"; > = 0.5;

#endif /* !TWEAKABLE_TEXEL_OFFSET */



	QUAD_REAL2 QuadScreenSize : VIEWPORTPIXELSIZE < string UIWidget="None"; >;



#endif /* NO_TEXEL_OFFSET */



////////////////////////////////////////////////////////////

////////////////////////////////// vertex shaders //////////

////////////////////////////////////////////////////////////



QuadVertexOutput ScreenQuadVS(

		QUAD_REAL3 Position : POSITION, 

		QUAD_REAL3 TexCoord : TEXCOORD0

) {

    QuadVertexOutput OUT;

    OUT.Position = QUAD_REAL4(Position, 1);

#ifdef NO_TEXEL_OFFSET

    OUT.UV = TexCoord.xy;

#else /* NO_TEXEL_OFFSET */

	QUAD_REAL2 off = QUAD_REAL2(QuadTexOffset/(QuadScreenSize.x),QuadTexOffset/(QuadScreenSize.y));

    OUT.UV = QUAD_REAL2(TexCoord.xy+off); 

#endif /* NO_TEXEL_OFFSET */

    return OUT;

}



//////////////////////////////////////////////////////

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

//////////////////////////////////////////////////////



// add glow on top of model



QUAD_REAL4 TexQuadPS(QuadVertexOutput IN,uniform sampler2D InputSampler) : COLOR

{   

	QUAD_REAL4 texCol = tex2D(InputSampler, IN.UV);

	return texCol;

}  



QUAD_REAL4 TexQuadBiasPS(QuadVertexOutput IN,uniform sampler2D InputSampler,QUAD_REAL TBias) : COLOR

{   

	QUAD_REAL4 texCol = tex2Dbias(InputSampler, QUAD_REAL4(IN.UV,0,TBias));

	return texCol;

}  



//////////////////////////////////////////////////////////////////

/// Macros to define passes within Techniques ////////////////////

//////////////////////////////////////////////////////////////////



// older HLSL syntax

#define TEX_TECH(TechName,SamplerName) technique TechName { \

    pass TexturePass  { \

		VertexShader = compile vs_2_0 ScreenQuadVS(); \

		AlphaBlendEnable = false; ZEnable = false; \

		PixelShader  = compile ps_2_a TexQuadPS(SamplerName); } }



#define TEX_BLEND_TECH(TechName,SamplerName) technique TechName { \

    pass TexturePass { \

		VertexShader = compile vs_2_0 ScreenQuadVS(); \

		ZEnable = false; AlphaBlendEnable = true; \

		SrcBlend = SrcAlpha; DestBlend = InvSrcAlpha; \

		PixelShader  = compile ps_2_a TexQuadPS(SamplerName); } }



// newer HLSL syntax



#define TEX_TECH2(TechName,SamplerName,TargName) technique TechName { \

    pass TexturePass  < \

		string ScriptFunction = "RenderColorTarget0=" (TargName) ";" \

    							"DrawInternal=Buffer;"; \

	> { \

		VertexShader = compile vs_2_0 ScreenQuadVS(); \

		AlphaBlendEnable = false; ZEnable = false; \

		PixelShader  = compile ps_2_a TexQuadPS(SamplerName); } }



#define TEX_BLEND_TECH2(TechName,SamplerName) technique TechName { \

    pass TexturePass < \

		string ScriptFunction = "RenderColorTarget0=" (TargName) ";" \

    							"DrawInternal=Buffer;"; \

	> { \

		VertexShader = compile vs_2_0 ScreenQuadVS(); \

		ZEnable = false; AlphaBlendEnable = true; \

		SrcBlend = SrcAlpha; DestBlend = InvSrcAlpha; \

		PixelShader  = compile ps_2_a TexQuadPS(SamplerName); } }



#endif /* _QUAD_FXH */



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

]]></effect><effect path="f:\devrel\sdk\media\hlsl\include\\shadowmap.fxh"><![CDATA[/*********************************************************************NVMH3****

File:  $Id: //sw/devrel/SDK/MEDIA/HLSL/include/shadowMap.fxh#2 $



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.



A few utility macros and functions for shadow mapping.

	See typical usage in effect files like shadRPortHW.fx and see notes below.



$Date: 2005/07/19 $

$Author: kbjorke $



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



#ifndef _SHADOWMAP_FXH

#define _SHADOWMAP_FXH



#include <include\\Quad.fxh>



//////////////////////////////////////////////

// CONSTANTS /////////////////////////////////

//////////////////////////////////////////////



// Some user-assignable macros -- define their values before including

//		"shadowMap.fxh" to override these defaults



#ifndef SHADOW_SIZE

#define SHADOW_SIZE 512

#endif /* !SHADOW_SIZE */



// other formats include "D24X8_SHADOWMAP" and "D16_SHADOWMAP"

#ifndef SHADOW_FORMAT

#define SHADOW_FORMAT "D24S8_SHADOWMAP"

#endif /* SHADOW_FORMAT */



#ifndef MAX_SHADOW_BIAS

#define MAX_SHADOW_BIAS 0.00015

#endif /* !MAX_SHADOW_BIAS */



// Define BLACK_SHADOW_PASS before including "shadowMap.fxh" for a SLIGHTLY faster generation

//		of the "throwaway" RGB buffer created when generating depth maps

// #define BLACK_SHADOW_PASS



//////////////////////////////////////////////////////

//// VM FUNCTIONS ////////////////////////////////////

//////////////////////////////////////////////////////



// #define SHAD_BIT_DEPTH 16	/* only significant for DirectX8 */



float4x4 make_bias_mat(float BiasVal)

{

	float fTexWidth = SHADOW_SIZE;

	float fTexHeight = SHADOW_SIZE;

	// float fZScale = pow(2.0,((float)SHAD_BIT_DEPTH))-1.0; // dx8

	float fZScale = 1.0; //dx9

	float fOffsetX = 0.5f + (0.5f / fTexWidth);

	float fOffsetY = 0.5f + (0.5f / fTexHeight);

	float4x4 result = float4x4(0.5f,     0.0f,     0.0f,      0.0f,

					0.0f,    -0.5f,     0.0f,      0.0f,

					0.0f,     0.0f,     fZScale,   0.0f,

					fOffsetX, fOffsetY, -BiasVal,     1.0f );

	return result;

}



//////////////////////////////////////////////////////

// DECLARATION MACROS ////////////////////////////////

//////////////////////////////////////////////////////



//

// Create standard biasing tweakable slider, and create a

//		static global bias transofrm at the same time

// Typical usage: SHADOW_XFORMS("light0",L0ViewXf,L0ProjXf,L0VPXf)

//

#define DECLARE_SHADOW_BIAS float ShadBias < string UIWidget = "slider"; \

    float UIMin = 0; float UIMax = MAX_SHADOW_BIAS; float UIStep = 0.00001; \

    string UIName = "Shadow Bias"; > = 0.0001; \

static float4x4 ShadBiasXf = make_bias_mat(ShadBias);



//

// Declare standard setup for lamp transofrms using "frustrum."

// Typical usage: SHADOW_XFORMS("light0",L0ViewXf,L0ProjXf,L0VPXf)

//

#define DECLARE_SHADOW_XFORMS(LampName,LampView,LampProj,LampViewProj) \

	float4x4 LampView : View < string frustum = (LampName); >; \

	float4x4 LampProj : Projection < string frustum = (LampName); >; \

	static float4x4 LampViewProj = mul(LampView,LampProj);



//

// Declare standard square_sized shadow map targets.

// Typical use: DECLARE_SHADOW_MAPS(ColorShadMap,ColorShadSampler,ShadDepthTarget,ShadDepthSampler)

//

#define DECLARE_SHADOW_MAPS(CTex,CSamp,DTex,DSamp) \

texture CTex : RENDERCOLORTARGET < float2 Dimensions = {SHADOW_SIZE,SHADOW_SIZE}; \

    string Format = "x8b8g8r8" ; string UIWidget = "None"; >; \

sampler CSamp = sampler_state { texture = <CTex>; \

    AddressU  = CLAMP; AddressV = CLAMP; \

    MipFilter = NONE; MinFilter = LINEAR; MagFilter = LINEAR; }; \

texture DTex : RENDERDEPTHSTENCILTARGET < float2 Dimensions = {SHADOW_SIZE,SHADOW_SIZE}; \

    string format = (SHADOW_FORMAT); string UIWidget = "None"; >; \

sampler DSamp = sampler_state { texture = <DTex>; \

    AddressU  = CLAMP; AddressV = CLAMP; \

    MipFilter = NONE; MinFilter = LINEAR; MagFilter = LINEAR; };



/////////////////////////////////////////////////////////

// Structures ///////////////////////////////////////////

/////////////////////////////////////////////////////////



/* data from application vertex buffer */

struct ShadowAppData {

    float3 Position	: POSITION;

    float4 UV		: TEXCOORD0;	// provided for potential use

    float4 Normal	: NORMAL;		// ignored if BLACK_SHADOW_PASS

};



// Connector from vertex (no pixel shader needed) for simple shadow 

struct ShadowVertexOutput {

    float4 HPosition	: POSITION;

	float4 diff : COLOR0;

};



//

// Connector from vertex to pixel shader for typical usage. The

//		"LProj" member is the crucial one for shadow mapping.

//

struct ShadowingVertexOutput {

    float4 HPosition	: POSITION;

    float2 UV		: TEXCOORD0;

    float3 LightVec	: TEXCOORD1;

    float3 WNormal	: TEXCOORD2;

    float3 WView	: TEXCOORD3;

    float4 LProj	: TEXCOORD4;	// current position in light-projection space

};



/////////////////////////////////////////////////////////

// Vertex Shaders ///////////////////////////////////////

/////////////////////////////////////////////////////////



//

// Use this vertex shader for GENERATING shadows. It needs to know some transforms

//		from your scene, pass them as uniform aguments in the technique like so:

//			VertexShader = compile vs_2_0 shadowGenVS(WorldXf,WorldITXf,ShadowViewProjXf);

// Note that a color is returned because DirectX requires you to render an RGB value in

//		addition to the depth map. If BLACK_SHADOW_PASS is defined this will just be black,

//		otherwise it will encode the object-space normal as a color, which can be useful

//		for debugging. Either way, no pixel shader is required for the shadow-generation pass.

//

ShadowVertexOutput shadowGenVS(ShadowAppData IN,

		uniform float4x4 WorldXform,

		uniform float4x4 WorldITXform,

		uniform float4x4 ShadowVPXform) {

    ShadowVertexOutput OUT = (ShadowVertexOutput)0;

    float4 Po = float4(IN.Position.xyz,(float)1.0);	// object coordinates

    float4 Pw = mul(Po,WorldXform);			// "P" in world coordinates

    float4 Pl = mul(Pw,ShadowVPXform);  // "P" in light coords

    OUT.HPosition = Pl; // screen clipspace coords

#ifndef BLACK_SHADOW_PASS

    // shading this just for amusement in the texture pane

    float4 N = mul(IN.Normal,WorldITXform); // world coords

    N = normalize(N);

    OUT.diff = 0.5 + 0.5 * N;

#else /* !BLACK_SHADOW_PASS */

    OUT.diff = float4(0,0,0,1);

#endif /* !BLACK_SHADOW_PASS */

    return OUT;

}



//

// A typical vertex shader for USING shadows. It needs to know some transforms

//		from your scene, pass them as uniform aguments in the technique like so:

//			VertexShader = compile vs_2_0

//						shadowUseVS(WorldXf,WorldITXf,WorldViewProjXf,

//								ShadowViewProjXf,ViewIXf,ShadBiasXf, LightPosition);

// Note that a color is returned because DirectX requires you to render an RGB value in

//		addition to the depth map. If BLACK_SHADOW_PASS is defined this will just be black,

//		otherwise it will encode the object-space normal as a color, which can be useful

//		for debugging. Either way, no pixel shader is required for the shadow-generation pass.

//

ShadowingVertexOutput shadowUseVS(ShadowAppData IN,

		uniform float4x4 WorldXform,

		uniform float4x4 WorldITXform,

		uniform float4x4 WVPXform,

		uniform float4x4 ShadowVPXform,

		uniform float4x4 ViewIXform,

		uniform float4x4 BiasXform,

		uniform float3 LightPosition) {

    ShadowingVertexOutput OUT = (ShadowingVertexOutput)0;

    OUT.WNormal = mul(IN.Normal,WorldITXform).xyz; // world coords

    float4 Po = float4(IN.Position.xyz,(float)1.0);	// "P" in object coordinates

    float4 Pw = mul(Po,WorldXform);			// "P" in world coordinates

    float4 Pl = mul(Pw,ShadowVPXform);  // "P" in light coords

    //OUT.LProj = Pl;							// ...for pixel-shader shadow calcs

    OUT.LProj = mul(Pl,BiasXform);				// bias to make texcoord

    //

    OUT.WView = normalize(ViewIXform[3].xyz - Pw.xyz);	// world coords

    OUT.HPosition = mul(Po,WVPXform);	// screen clipspace coords

    OUT.UV = IN.UV.xy;							// pass-thru

    OUT.LightVec = LightPosition - Pw.xyz;		// world coords

    return OUT;

}







#if 0



//

// TYPICAL USAGE: This code matches shadRPortHW.fx

//



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

/*********** pixel shader ********************************/

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



//

// Typical pixel shader that uses ShadowVertexOutput data -- all you need for the shadow

//		is one tex2Dproj() call!

//

// In this shader, when DEBUG_VIEW is defined, show the RGB portion of the

//		shadow pass, to verify that projection is correct



float4 useShadowPS(ShadowingVertexOutput IN) : COLOR

{

#ifdef DEBUG_VIEW

    return tex2Dproj(ColorShadSampler,IN.LProj);	// show the RGB render instead

#else /*!DEBUG_VIEW */

    //

    // shading...

    //

    float3 Nn = normalize(IN.WNormal);

    float3 Vn = normalize(IN.WView);

    float falloff = 1.0 / dot(IN.LightVec,IN.LightVec);

    float3 Ln = normalize(IN.LightVec);

    float3 Hn = normalize(Vn + Ln);

    float hdn = dot(Hn,Nn);

    float ldn = dot(Ln,Nn);

    float4 litVec = lit(ldn,hdn,SpecExpon);

    ldn = litVec.y * SpotLightIntensity;

    float cone = normalize(IN.LProj.xyz).z;

    cone = max((float)0,((cone-CosSpotAng)/(((float)1.0)-CosSpotAng)));

    float3 ambiContrib = SurfColor * AmbiLightColor;

    float3 diffContrib = SurfColor*(Kd*ldn * SpotLightColor);

    float3 specContrib = ((ldn * litVec.z * Ks) * SpotLightColor);

    float3 result = diffContrib + specContrib;

    //

    // shadowing.....

    //

    float4 shadowed = tex2Dproj(ShadDepthSampler,IN.LProj);

    return float4((cone*falloff*shadowed.x*result)+ambiContrib,1);

#endif /*!DEBUG_VIEW */

}



////////////////////////////////////////////////////////////////////

/// TECHNIQUES /////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////



technique Main <

	string Script = "Pass=MakeShadow;"

					"Pass=UseShadow;";

> {

	pass MakeShadow <

		string Script = "RenderColorTarget0=ColorShadMap;"

						"RenderDepthStencilTarget=ShadDepthTarget;"

						"RenderPort=light0;"

						"ClearSetColor=ShadowClearColor;"

						"ClearSetDepth=ClearDepth;"

						"Clear=Color;"

						"Clear=Depth;"

						"Draw=geometry;";

	> {

		VertexShader = compile vs_2_0 shadCamVS();

		ZEnable = true;

		ZWriteEnable = true;

		ZFunc = LessEqual;

		CullMode = None;

		// no pixel shader

	}

	pass UseShadow <

		string Script = "RenderColorTarget0=;"

						"RenderDepthStencilTarget=;"

						"RenderPort=;"

						"ClearSetColor=ClearColor;"

						"ClearSetDepth=ClearDepth;"

						"Clear=Color;"

						"Clear=Depth;"

						"Draw=geometry;";

	> {

		VertexShader = compile vs_2_0 mainCamVS();

		ZEnable = true;

		ZWriteEnable = true;

		ZFunc = LessEqual;

		CullMode = None;

		PixelShader = compile ps_2_a useShadowPS();

	}

}



#endif /* ZERO */



#endif /* _SHADOWMAP_FXH */



/***************************** eof ***/

]]></effect><effect path="f:\devrel\sdk\media\hlsl\include\\spot_tex.fxh"><![CDATA[// spot_tex makes a spotlight pattern to be projected

// $Revision: #1 $ 



#ifndef _H_SPOT_TEX

#define _H_SPOT_TEX



#ifndef SPOT_TEX_SIZE

#define SPOT_TEX_SIZE 64

#endif /* SPOT_TEX_SIZE */



#ifndef SPOT_TEX_INSIDE

#define SPOT_TEX_INSIDE 0.4

#endif /* SPOT_TEX_INSIDE */



// function used to fill texture

float4 spot_texel(float2 P : POSITION,float2 dP : PSIZE) : COLOR

{

	//adjust so the outer rows and columns are ALWAYS black

	float2 rad = float2(0.5,0.5) - dP;

	float2 v = P - float2(0.5,0.5);

	float d = length(v)/rad.x;	// for now simple case of (dP.x==dP.y)

	float s = 1.0 - smoothstep(SPOT_TEX_INSIDE,1,d);

    return s.xxxx;

}



texture SpotTex  <

    string TextureType = "2D";

    string function = "spot_texel";

    string UIWidget = "None";

    int width = SPOT_TEX_SIZE, height = SPOT_TEX_SIZE;

>;



// samplers

sampler SpotSamp = sampler_state 

{

    texture = <SpotTex>;

    AddressU  = CLAMP;        

    AddressV  = CLAMP;

    MIPFILTER = LINEAR;

    MINFILTER = LINEAR;

    MAGFILTER = LINEAR;

};



#endif /* _H_SPOT_TEX */



]]></effect></media_objects></fxstudio_project>