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$Revision: #3 $

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% Create a scratched-movie-film look using animated noise

keywords: image_processing animation 
date: 070401



To learn more about shading, shaders, and to bounce ideas off other shader
    authors and users, visit the NVIDIA Shader Library Forums at:

    http://developer.nvidia.com/forums/

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

/*****************************************************************/
/*** HOST APPLICATION IDENTIFIERS ********************************/
/*** Potentially predefined by varying host environments *********/
/*****************************************************************/

// #define _XSI_		/* predefined when running in XSI */

#ifndef FXCOMPOSER_VERSION	/* for very old versions */
#define FXCOMPOSER_VERSION 180
#endif /* FXCOMPOSER_VERSION */

// #define FLIP_TEXTURE_Y	/* Different in OpenGL & DirectX */

/*****************************************************************/
/*** EFFECT-SPECIFIC CODE BEGINS HERE ****************************/
/*****************************************************************/

//
// #define this macro to permit reading of COLLADA-FX 
//   shared-surface render targets
//
// #define SHARED_BG_IMAGE

#include "include/Quad.cgh"

#define NOISE2D_SCALE 1
//#define NOISE2D_FORMAT "A16B16G16R16F"
#include "include/noise_2d.cgh"

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

// color and depth used for full-screen clears

float4 gClearColor <
    string UIWidget = "Color";
    string UIName = "Background";
> = {0.1, 0.1, 0.1, 0.0};

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

float gTimer : TIME < string UIWidget = "None"; >;

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

float gSpeed1 <
    string UIName = "Speed (Slower=Longer Scratches)";
    string UIWidget = "slider";
    float UIMin = 0.0f;
    float UIMax = 0.2f;
    float UIStep = 0.0001f;
> = 0.03f;

float gSpeed2 <
    string UIName = "Side Scroll Speed";
    string UIWidget = "slider";
    float UIMin = 0.0f;
    float UIMax = 0.01f;
    float UIStep = 0.0001f;
> = 0.01f;

float gScratchIntensity <
    string UIName = "Scratch Threshhold";
    string UIWidget = "slider";
    float UIMin = 0.0f;
    float UIMax = 1.0f;
    float UIStep = 0.0001f;
> = 0.65f;

float gIS <
    string UIName = "Scratch Width";
    string UIWidget = "slider";
    float UIMin = 0.0f;
    float UIMax = 0.1f;
    float UIStep = 0.0001f;
> = 0.01f;

///////////////////////////////////////////////////////////
/////////////////////////////////////// Textures //////////
///////////////////////////////////////////////////////////

DECLARE_QUAD_TEX(gSceneTexture,gSceneSampler,"A8R8G8B8")
DECLARE_QUAD_DEPTH_BUFFER(DepthBuffer,"D24S8")

//////////////////////////////////////////////////////
/////////////////////////////////// pixel shader /////
//////////////////////////////////////////////////////

float4 scratchPS(QuadVertexOutput IN,
		uniform sampler2D SceneSampler,
		uniform sampler2D Noise2DSamp,
		uniform float Timer,
		uniform float Speed1,
		uniform float Speed2,
		uniform float ScratchIntensity,
		uniform float IS
) : COLOR {
    float ScanLine = (Timer*Speed1);
    float Side = (Timer*Speed2);
    float4 img = tex2D(SceneSampler,IN.UV);
    float2 s = float2(IN.UV.x+Side,ScanLine);
    float scratch = tex2D(Noise2DSamp,s).x;
    scratch = 2.0f*(scratch - ScratchIntensity)/IS;
    scratch = 1.0-abs(1.0f-scratch);
    //scratch = scratch * 100.0f;
    scratch = max(0,scratch);
    //scratch = min(scratch,1.0f);
    return img + float4(scratch.xxx,0);
}

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

technique Main < string Script =
#ifndef SHARED_BG_IMAGE
    "RenderColorTarget0=gSceneTexture;"
    "RenderDepthStencilTarget=DepthBuffer;"
    "ClearSetColor=gClearColor;"
    "ClearSetDepth=gClearDepth;"
	"Clear=Color;"
	"Clear=Depth;"
    "ScriptExternal=Color;" // calls all "previous" techniques & materials
    "Pass=PostP0;";
#else /* defined(SHARED_BG_IMAGE)  - no nead to create one, COLLADA has done it for us  */
    "ClearSetColor=gClearColor;"
    "ClearSetDepth=gClearDepth;"
	"Clear=Color;"
	"Clear=Depth;"
    "Pass=PostP0;";
#endif /* SHARED_BG_IMAGE */
> {
    pass PostP0 < string Script =
	"RenderColorTarget0=;"
	"RenderDepthStencilTarget=;"
	"Draw=Buffer;";
    > {
	VertexProgram = compile vp40 ScreenQuadVS2(QuadTexelOffsets);
		DepthTestEnable = false;
		DepthMask = false;
		BlendEnable = false;
		CullFaceEnable = false;
		DepthFunc = LEqual;
	FragmentProgram = compile fp40 scratchPS(gSceneSampler,
			    gNoise2DSamp,
			    gTimer,gSpeed1,gSpeed2,
			    gScratchIntensity,gIS);
    }
}

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