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*******************************************************************************
$Revision: #4 $

Copyright NVIDIA Corporation 2008
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NVIDIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.


% Color space conversion

keywords: image_processing color_conversion
date: 070317


keywords: DirectX10
// Note that this version has twin versions of all techniques,
//   so that this single effect file can be used in *either*
//   DirectX9 or DirectX10

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 */
// #define TORQUE		/* predefined in TGEA 1.7 and up */
// #define _3DSMAX_		/* predefined in 3DS Max */
#ifdef _3DSMAX_
int ParamID = 0x0003;		/* Used by Max to select the correct parser */
#endif /* _3DSMAX_ */
#ifdef _XSI_
#define Main Static		/* Technique name used for export to XNA */
#endif /* _XSI_ */

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

#ifndef DIRECT3D_VERSION
#define DIRECT3D_VERSION 0x900
#endif /* DIRECT3D_VERSION */

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

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

// shared-surface access supported in Cg version
#include <include\\color_spaces.fxh>
#include <include\\Quad.fxh>

float Script : STANDARDSGLOBAL <
    string UIWidget = "none";
    string ScriptClass = "scene";
    string ScriptOrder = "postprocess";
    string ScriptOutput = "color";
    string Script = "Technique=Technique?Main:Main10;";
> = 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 ////////////////////////
///////////////////////////////////////

//
// DirectX10 Version
//
#if DIRECT3D_VERSION >= 0xa00
//
// Standard DirectX10 Material State Blocks
//
RasterizerState DisableCulling { CullMode = NONE; };
DepthStencilState DepthEnabling { DepthEnable = TRUE; };
DepthStencilState DepthDisabling {
	DepthEnable = FALSE;
	DepthWriteMask = ZERO;
};
BlendState DisableBlend { BlendEnable[0] = FALSE; };

technique10 Main10 < 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;";
    > {
        SetVertexShader( CompileShader( vs_4_0, ScreenQuadVS2(QuadTexelOffsets) ) );
        SetGeometryShader( NULL );
        SetPixelShader( CompileShader( ps_4_0, ToHSV(gSceneSampler) ) );
	    SetRasterizerState(DisableCulling);
	    SetDepthStencilState(DepthDisabling, 0);
	    SetBlendState(DisableBlend, float4( 0.0f, 0.0f, 0.0f, 0.0f ), 0xFFFFFFFF);
    }
}
#endif /* DIRECT3D_VERSION >= 0xa00 */

//
// DirectX9 Version
//
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;";
    > {
	VertexShader = compile vs_3_0 ScreenQuadVS2(QuadTexelOffsets);
		ZEnable = false;
		ZWriteEnable = false;
		AlphaBlendEnable = false;
		CullMode = None;
	PixelShader = compile ps_3_0 ToHSV(gSceneSampler);
    }
}

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