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File:  $Id: //sw/devrel/SDK/MEDIA/HLSL/uvDetective.fx#1 $



Copyright NVIDIA Corporation 2002

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:

	Look for regions where desired texture reso is dominant.

	Set desired size in the "Reso" parameter

	In the "TexRez" techniques, areas of red and green mean that in those

		area a lower-res MIP level will be used. Blue areas can use maps of higher

		res than the selected reso. Note that you should size the object to

		the approxiamte size of the expected final view!



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



// for generated MipTex - TEX_RESO should be 2^TEX_LEVELS

#define TEX_LEVELS 9

#define TEX_RESO 512



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

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

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



int Reso = 512;

static float TargetDeriv = 1.0f/((float)Reso);

static float HalfTD = (TargetDeriv*0.5);

static float TwoTD = (TargetDeriv*2.0);



static float Diagonal = sqrt(2.0*TargetDeriv*TargetDeriv);

static float HalfDiag = (Diagonal*0.5);

static float TwoDiag = (Diagonal*2.0);



float Scale : UNITSSCALE

<

    string UIWidget = "slider";

    float UIMin = 1;

    float UIMax = 64.0;

    float UIStep = 1;

    string UIName = "Scale for uvDerivs technique";

> = 64.0;



/************* UN-TWEAKABLES **************/



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

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

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

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



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



/************ Texture ***********/



float4 mip_colors(float2 Pos:POSITION,float2 dP:PSIZE) : COLOR

{

	float d = 1.0/((dP.x+dP.y)/2.0);

	float3 p = 0;

	if (d < 8) {

		p = 1;

	} else {

		float q = log(d)/log(2);

		q = floor(q+.5);

		if (fmod(q,3) == 0) { p.x = .5;}

		if (fmod(q,6) == 0) { p.x = 1;}

		if (fmod(q,2) == 0) { p.y = .5;}

		if (fmod(q,4) == 0) { p.y = 1;}

		q = q / TEX_LEVELS;

		p.z = q;

	}

	return float4(p,1);

}



texture MipTex  <

    string TextureType = "2D";

    string function = "mip_colors";

    string UIWidget = "None";

    int width = TEX_RESO;

    int height = TEX_RESO;

>;



sampler MipSamp = sampler_state 

{

    texture = <MipTex>;

    AddressU  = WRAP;        

    AddressV  = WRAP;

    MIPFILTER = LINEAR;

    MINFILTER = LINEAR;

    MAGFILTER = LINEAR;

};



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



/* data from application vertex buffer */

struct appdata {

    float3 Pos    : POSITION;

    float4 UV        : TEXCOORD0;

    // float4 Normal    : NORMAL;		// superfluous for now

    // float4 Tangent    : TANGENT0;

    // float4 Binormal    : BINORMAL0;

};



/* data passed from vertex shader to pixel shader */

struct vertexOutput {

    float4 HPosition    : POSITION;

    float2 UV    : TEXCOORD0;

};



/*********** vertex shader for all ******/



vertexOutput simpleVS(appdata IN) {

    vertexOutput OUT;

    float4 Po = float4(IN.Pos,1.0);

    OUT.HPosition = mul(Po, WorldViewProjectionXf);

    OUT.UV = IN.UV.xy;

    return OUT;

}



/********* utility functions for pixel shaders ********/



float4 vecColor(float4 V) {

    float3 Nc = 0.5 * ((V.xyz) + ((1.0).xxx));

    return float4(Nc,1);

}



float4 vecColor(float3 V) {

    float3 Nc = 0.5 * ((V.xyz) + ((1.0).xxx));

    return float4(Nc,1);

}



float4 vecColorN(float4 V) {

    float3 Nc = 0.5 * (normalize(V.xyz) + ((1.0).xxx));

    return float4(Nc,1);

}



float4 vecColorN(float3 V) {

    float3 Nc = 0.5 * (normalize(V.xyz) + ((1.0).xxx));

    return float4(Nc,1);

}



/********* pixel shaders ********/



float4 uvcPS(vertexOutput IN) : COLOR { return float4(IN.UV,0,1); }



float4 uvDerivsPS(vertexOutput IN) : COLOR

{

    float2 dd = Scale * (abs(ddx(IN.UV)) + abs(ddy(IN.UV)));

    return float4(dd,0,1);

}





float4 dv_col(float2 d)

{

    float4 dd = float4(0,0,0,1);

    if (d.x > TwoTD) { dd.x = 1.0;}

    if (d.y > TwoTD) { dd.y = 1.0;}

    if (d.x < HalfTD) { dd.z = 1.0;}

    //if (d.y < HalfTD) { dd.z = 1.0;}

    return(dd);

}



float4 texSizeXPS(vertexOutput IN) : COLOR

{

    return dv_col(abs(ddx(IN.UV)));

}

float4 texSizeYPS(vertexOutput IN) : COLOR

{

    return dv_col(abs(ddy(IN.UV)));

}



float4 texSizeDPS_old(vertexOutput IN) : COLOR

{

	float2 dx = ddx(IN.UV);

	float2 dy = ddy(IN.UV);

	float2 du = float2(dx.x,dy.x);

	float2 dv = float2(dx.y,dy.y);

    float d = sqrt(dot(du,du) + dot(dv,dv));

    float4 yc = dv_col(abs(ddy(IN.UV)));

    float4 dd = float4(0,0,0,1);

    if (d > TwoDiag) { dd.x = 1.0;}

    if (d > TwoDiag) { dd.y = 1.0;}

    if (d < HalfDiag) { dd.z = 1.0;}

    //if (d.y < HalfDiag) { dd.z = 1.0;}

    return(dd);

}



float4 texSizeDPS(vertexOutput IN) : COLOR

{

	float2 dx = ddx(IN.UV);

	float2 dy = ddy(IN.UV);

    float d = sqrt(dot(dx,dx) + dot(dy,dy));

    float4 yc = dv_col(abs(ddy(IN.UV)));

    float4 dd = float4(0,0,0,1);

    if (d > TwoDiag) { dd.x = 1.0;}

    if (d > TwoDiag) { dd.y = 1.0;}

    if (d < HalfDiag) { dd.z = 1.0;}

    //if (d.y < HalfDiag) { dd.z = 1.0;}

    return(dd);

}



float4 mtPS(vertexOutput IN) : COLOR { return tex2D(MipSamp,IN.UV); }



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

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

/******* TECHNIQUES *********************************************/

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

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



#define TECH(name,vertShader,pixShader) technique name { pass p0 { \

		VertexShader = compile vs_2_0 vertShader (); \

		ZEnable = true; ZWriteEnable = true; CullMode = None; \

		PixelShader = compile ps_2_a pixShader (); } }



#define TECH3(name,vertShader,pixShader) technique name { pass p0 { \

		VertexShader = compile vs_3_0 vertShader (); \

		ZEnable = true; ZWriteEnable = true; CullMode = None; \

		PixelShader = compile ps_3_0 pixShader (); } }



TECH(texRezDiagonal,simpleVS,texSizeDPS)

TECH(texRezX,simpleVS,texSizeXPS)

TECH(texRezY,simpleVS,texSizeYPS)

TECH(uvValues,simpleVS,uvcPS)

TECH(uvDerivs,simpleVS,uvDerivsPS)

TECH(mipTex,simpleVS,mtPS)



/***************************** eof ***/]]></effect></media_objects></fxstudio_project>