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File:  $Id: //sw/devrel/SDK/MEDIA/HLSL/Toksvig-split-directional.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.



Comments:

	Toksvig-factor bump mapping

	Note use of 16-bit textures (g16r16) for precision with performance



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



// Compile-time flags

// feature flags

//#define DO_COLORTEX



float Script : STANDARDSGLOBAL

<

	string UIWidget = "none";

	string ScriptClass = "object";

	string ScriptOrder = "standard";

	string ScriptOutput = "color";

	// We just call a script in the main technique.

	string Script = "Technique=Technique?Toksvig:Non_Toksvig;";

> = 0.8; // version #



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



#define SPEC_EXPON 64.0

#define TOX_TABLE_SIZE 256

#define TOX_FORMAT "g16r16"



/************* "UN-TWEAKABLES," TRACKED BY CPU APPLICATION **************/



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

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

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

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



float2 ScreenSize : VIEWPORTPIXELSIZE <string UIWidget="None";>;



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

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

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



////////////////////////////////////////////// light



float3 LightDir : DIRECTION <

	string UIName = "Direction";

	string Object = "DirectionalLight";

	string Space = "World";

> = {-1.0f, -1.0f, -0.2f};



float3 LightColor : SPECULAR <

	string UIName = "Lamp";

	string UIWidget = "Color";

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



////////////////////////////////////////////// ambient light



float3 AmbiLightColor : Ambient

<

    string UIName = "Ambient";

	string UIWidget = "Color";

> = {0.07f, 0.07f, 0.07f};



////////////////////////////////////////////// surface



float3 SurfColor : Diffuse

<

    string UIName = "Surface";

	string UIWidget = "Color";

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



float Kd

<

    string UIWidget = "slider";

    float UIMin = 0.0;

    float UIMax = 1.5;

    float UIStep = 0.01;

    string UIName = "Diffuse";

> = 0.6;



float Ks

<

    string UIWidget = "slider";

    float UIMin = 0.0;

    float UIMax = 1.5;

    float UIStep = 0.01;

    string UIName = "Specular";

> = 1.0;



float Bumpy <string UIWidget="None";> = 1.0;



float URep

<

    string UIWidget = "slider";

    float UIMin = 1.0;

    float UIMax = 40.0;

    float UIStep = 1.0;

    string UIName = "U Repeat";

> = 1.0;



float VRep

<

    string UIWidget = "slider";

    float UIMin = 1.0;

    float UIMax = 40.0;

    float UIStep = 1.0;

    string UIName = "V Repeat";

> = 1.0;



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

/// TEXTURES ///////////////////////////////////////////

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



#ifdef DO_COLORTEX

texture ColorTexture : DIFFUSE

<

    string ResourceName = "default_color.dds";

    string TextureType = "2D";

>;



sampler2D ColorSampler = sampler_state

{

	Texture = <ColorTexture>;

	MinFilter = Linear;

	MagFilter = Linear;

	MipFilter = Linear;

};

#endif /* !DO_COLORTEX */



texture NormalTexture : NORMAL

<

    string ResourceName = "default_bump_normal.dds";

    string TextureType = "2D";

>;



sampler2D NormalSampler = sampler_state

{

	Texture = <NormalTexture>;

	MinFilter = Linear;

	MagFilter = Linear;

	MipFilter = Linear;

};



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



float spec_func(float s, float NaH, float NaNa) {

    float toksvig = sqrt(NaNa)/(sqrt(NaNa)+s*(1-sqrt(NaNa)));

    return (1.0+toksvig*s)/(1.0+s)*pow(NaH/sqrt(NaNa), toksvig*s);

}



float4 make_specular_tex(float2 Pos : POSITION, float2 Size : PSIZE) : COLOR {

	float f  = spec_func(SPEC_EXPON,Pos.x,Pos.y);

	return float4(f.xxx,0.0);

}



texture SpecTex <

    string function = "make_specular_tex";

    int width = TOX_TABLE_SIZE;

    int height = TOX_TABLE_SIZE;

	string UIWidget = "None";

	string format = (TOX_FORMAT);

>;



sampler SpecSampler = sampler_state 

{

    texture = <SpecTex>;

    AddressU  = CLAMP;        

    AddressV  = CLAMP;

    MIPFILTER = NONE;

    MINFILTER = ANISOTROPIC;

    MAGFILTER = ANISOTROPIC;

};



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



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

/************* DATA STRUCTS ******************************/

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



/* data from application vertex buffer */

struct appdata {

    float3 Position	: POSITION;

    float4 UV		: TEXCOORD0;

    float4 Normal	: NORMAL;

    float4 Tangent	: TANGENT0;

    float4 Binormal	: BINORMAL0;

};



struct vertexOutput {

    float4 HPosition	: POSITION;

    float2 UV			: TEXCOORD0;

    float3 WorldNormal	: TEXCOORD1;

    float3 WorldView	: TEXCOORD2;

    float3 WorldTangent	: TEXCOORD3;

    float3 WorldBinorm	: TEXCOORD4;

};



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

/*********** vertex shader *******************************/

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



vertexOutput basicVS(appdata IN) {

    vertexOutput OUT;

    OUT.WorldNormal = normalize(mul(IN.Normal,WorldITXf).xyz);

    OUT.WorldTangent = normalize(mul(IN.Tangent,WorldITXf).xyz);

    OUT.WorldBinorm = normalize(mul(IN.Binormal,WorldITXf).xyz);

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

    float3 Pw = mul(Po,WorldXf).xyz;		// world coordinates

    OUT.UV = (float2(URep,VRep) * IN.UV.xy);

    OUT.WorldView = normalize(ViewIXf[3].xyz - Pw);	// obj coords

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

    return OUT;

}



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

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

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



float4 toksvigPS(vertexOutput IN) : COLOR {

    float3 Nn = /*normalize*/(IN.WorldNormal);

    float3 Tn = /*normalize*/(IN.WorldTangent);

    float3 Bn = /*normalize*/(IN.WorldBinorm);

    float3 bumps = 2.0 * (tex2D(NormalSampler,IN.UV).xyz-(0.5).xxx);

    float3 Na = bumps.x * Tn + bumps.y * Bn + bumps.z * Nn;

    float3 Vn = normalize(IN.WorldView);

    float3 Ln = /*normalize*/(-LightDir);	// normalize() required? FXComposer should provide pre-norm'd value

    float3 Hn = normalize(Vn + Ln);

    float NaH = dot(Hn,Na);

	float NaNa = dot(Na,Na);

	//float2 texelAdjust = (0.5/TOX_TABLE_SIZE).xx;

	//float s = tex2D(SpecSampler,float2(NaH,NaNa)+texelAdjust).x;

	float s = tex2D(SpecSampler,float2(NaH,NaNa)).x;

    Nn = normalize(Na);

    float ldn = dot(Ln,Nn);

	ldn = max(ldn,0);

    float3 diffContrib = ldn * LightColor;

    float3 specContrib = ((s * Ks) * LightColor);

    // add, incorporating ambient light term

#ifdef DO_COLORTEX

    float3 colorTex = SurfColor * tex2D(ColorSampler,IN.UV).xyz;

#define SURF_COLOR colorTex

#else /* !DO_COLORTEX */

#define SURF_COLOR SurfColor

#endif /* !DO_COLORTEX */

    float3 result = SURF_COLOR*(Kd*diffContrib+AmbiLightColor) + specContrib;

    return float4(result.xyz,1.0);

}



float4 nonToksvigPS(vertexOutput IN) : COLOR {

    float3 Nn = normalize(IN.WorldNormal);

    float3 Tn = normalize(IN.WorldTangent);

    float3 Bn = normalize(IN.WorldBinorm);

    float3 bumps = (Bumpy*2.0) * (tex2D(NormalSampler,IN.UV).xyz-(0.5).xxx);

    Nn = (bumps.x*Tn + bumps.y*Bn + bumps.z*Nn);

    Nn = normalize(Nn);

    float3 Vn = normalize(IN.WorldView);

    float3 Ln = normalize(-LightDir);	// normalize() required?

    float3 Hn = normalize(Vn + Ln);

    float hdn = dot(Hn,Nn);

    float ldn = dot(Ln,Nn);

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

    float3 diffContrib = litVec.y * LightColor;

    float3 specContrib = ((litVec.z * Ks) * LightColor);

    // add, incorporating ambient light term

#ifdef DO_COLORTEX

    float3 colorTex = SurfColor * tex2D(ColorSampler,IN.UV).xyz;

#define SURF_COLOR colorTex

#else /* !DO_COLORTEX */

#define SURF_COLOR SurfColor

#endif /* !DO_COLORTEX */

    float3 result = SURF_COLOR*(Kd*diffContrib+AmbiLightColor) + specContrib;

    return float4(result.xyz,1.0);

}



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

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

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



technique Toksvig <

	string Script = "Pass=p0;";

> {

	pass p0  <

		string Script = "Draw=geometry;";

	> {

		VertexShader = compile vs_2_0 basicVS();

		ZEnable = true;

		ZWriteEnable = true;

		CullMode = None;

		PixelShader = compile ps_2_a toksvigPS();

	}

}



technique Non_Toksvig <

	string Script = "Pass=p0;";

> {

	pass p0  <

		string Script = "Draw=geometry;";

	> {

		VertexShader = compile vs_2_0 basicVS();

		ZEnable = true;

		ZWriteEnable = true;

		CullMode = None;

		PixelShader = compile ps_2_a nonToksvigPS();

	}

}



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

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