/*********************************************************************NVMH3****
*******************************************************************************
$Revision: #3 $

Copyright NVIDIA Corporation 2008
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*AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS
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LOSS) ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
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% Color space conversion

keywords: image_processing color_conversion
date: 070317



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/color_spaces.cgh"
#include "include/Quad.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;

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

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

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

QUAD_REAL4 ToHSV(QuadVertexOutput IN,
		    uniform sampler2D SceneSampler) : COLOR
{   
    QUAD_REAL4 rgba = tex2D(SceneSampler, IN.UV);
    return QUAD_REAL4(rgb_to_hsv(rgba.xyz),rgba.w); // don't lose alpha
}  

///////////////////////////////////////
/// 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 ToHSV(gSceneSampler);
    }
}

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