Novetus_src/clients/2009L/content/fonts/materials/programs/include/grass.cgh

#ifdef FXCOMPOSER_VERSION // in fxcompser editor
#include "include/common.cgh"
#else
#include "common.cgh"
#endif

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

/* data from application vertex buffer */
struct appdataTangent {
    float3 Position	: POSITION;
	float4 Color : COLOR;
    float2 StudsUV	: TEXCOORD0;
    float3 TexPos3D		: TEXCOORD1;
    float2 SurfaceUV: TEXCOORD2;
    float3 Normal	: NORMAL;
    float3 Tangent	: TANGENT0;
};

/* data passed from vertex shader to pixel shader */
struct VertexOutput {
    float4 HPosition	: POSITION;
	float4 Color 		: COLOR;
    float4 ModelUV		: TEXCOORD0;
    float4 TexPos3D		: TEXCOORD1; //  grain coordinate system
    								// coord w is attenuation 0 = no normal map, 1 = full normal map
    float3 Light0Vec	: TEXCOORD2;
    float3 Light1Vec	: TEXCOORD3;
    float3 WorldNormal	: TEXCOORD4;
    float3 WorldTangent	: TEXCOORD5;
    float3 WorldView	: TEXCOORD7;
	float4 ObjectNormal : TEXCOORD6;
};

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

VertexOutput mainVS(appdataTangent IN,
    uniform float4x4 WorldITXf, // our four standard "untweakable" xforms
	uniform float4x4 WorldXf,
	uniform float4x4 ViewIXf,
	uniform float4x4 WvpXf,
    uniform float4 Lamp0Pos,
    uniform float4 Lamp1Pos,
	uniform float NormMapScale) 
{
    VertexOutput OUT = (VertexOutput)0;
	
 	float3 unusedBinormal;
	vs_shared_lighting(
		IN.Position,
		IN.Normal,
		IN.Tangent,
    	WorldITXf, // our four standard "untweakable" xforms
		WorldXf,
		ViewIXf,
		WvpXf,
    	Lamp0Pos,
    	Lamp1Pos,
		OUT.Light0Vec,
		OUT.Light1Vec,
		OUT.WorldView,
		OUT.HPosition,
		OUT.WorldNormal,
		OUT.WorldTangent,
		unusedBinormal);
		
		
    //
    // This shader uses the object coordinates to determine the grass-grain
    //   coordinate system at shader runtime. Alternatively, you could bake
    //	 the coordinate system into the model as an alternative texcoord. The
    //	 current method applies to all possible models, while baking-in lets
    //	 you try different tricks such as modeling the grain of bent ,
    //	 say for a bow or for the hull timbers of a ship.
    //
	float cfactor = 0.980066578; 	//cos(0.2);
	float sfactor = 0.198669331; 	//sin(0.2);
	float cfactor2 = 0.955336489;	//cos(0.3);
	float sfactor2 = 0.295520207; 	//sin(0.3);
	float cfactor3 = 0.921060994;	//cos(0.4);
	float sfactor3 = 0.389418342;	//sin(0.4);
	float3 p = IN.TexPos3D;
	float3 shiftPos = p;

	shiftPos.x += p.x * cfactor + p.z * sfactor;
	shiftPos.z += p.x * -sfactor + p.z * cfactor;
	
	shiftPos.x += p.x * cfactor2 - p.y * sfactor2;
	shiftPos.y += p.x * sfactor2 + p.y * cfactor2;
	
	shiftPos.y += p.y * cfactor3 - p.z * sfactor3;
	shiftPos.z += p.y * sfactor3 + p.z * cfactor3;
	
	OUT.TexPos3D = float4(p,0); 
	OUT.ModelUV = float4(IN.StudsUV, IN.SurfaceUV* NormMapScale); // passthrough model UVs.
	OUT.Color = IN.Color; //Average color of the grass texture
	OUT.ObjectNormal = float4(IN.Normal,1);
	OUT.ObjectNormal.w = mul(WvpXf,float4(IN.Position,1)).z/200*1.5;
	OUT.TexPos3D.w = IN.TexPos3D.x ;
	OUT.ObjectNormal.xyz = normalize(OUT.ObjectNormal.xyz);
    return OUT;
}

/********* pixel shader ********/
float4 mainPSStuds(VertexOutput IN,
		uniform float3 Contrast,
		uniform float Ks,
		uniform float SpecExpon,
		uniform float3 Lamp0Color,
		uniform float3 Lamp1Color,
		uniform float3 AmbiColor,
		uniform float3 NoiseScale,
	    uniform sampler2D StudsSamp,
		uniform sampler3D NoiseSamp,
		uniform sampler2D NormalSamp,
		uniform sampler2D grassSamp,
		uniform sampler2D GrassNormalSamp) : COLOR
{
	float3 oo = IN.ObjectNormal.xyz;
	float4 studShade = tex2D(StudsSamp, IN.ModelUV.xy);
	float zdist = IN.ObjectNormal.w;
	float spread = 0.3;					  
	float grass_threshold = 0.95;	
	float NormalRatio = 0.15;
	float2 NormalUV = IN.ModelUV.zw; 
	
	float3 shiftPos = IN.TexPos3D.xyz;
	float3 ns = NoiseScale;
    float noiseval2 = tex3D(NoiseSamp,shiftPos.xyz*ns.x).x * 0.4;
	float noiseval = tex3D(NoiseSamp,shiftPos.zyx*ns.y).x * 0.6;
	noiseval -= noiseval2;
	float noiseval3 = tex3D(NoiseSamp,shiftPos.xyz*ns.z).x * 0.3;
	noiseval += noiseval3;

	float interp = (noiseval - grass_threshold + spread)/2/spread+0.5;
	interp = clamp(interp,0,1);
	
    float3 grassColor = tex2D(grassSamp, NormalUV).xyz;
	float3 dirt = tex2D(NormalSamp,NormalUV).xyz ;
	float3 grassNorm = tex2D(GrassNormalSamp,NormalUV).xyz;
	float3 dirtNorm = float3(0.5,0.5,1);
	float3 tNorm = lerp(grassNorm, dirtNorm, interp) - 0.5;
	
    float3 aWorldBinormal = cross(IN.WorldNormal , IN.WorldTangent);
	float3 NnBump = normalize(tNorm.x*IN.WorldTangent + tNorm.y*aWorldBinormal + tNorm.z*IN.WorldNormal);
    
	float fade = 1.5-abs(zdist);
	if (fade < 0.0)
		fade = 0.0;
	float3 dColor;

	dColor = lerp(grassColor+IN.Color.xyz-float3(0.31,0.43,0.146), dirt, interp*fade);
	
	float3 diffContrib;
	float3 specContrib;

	//Fade out the shader
	ps_shared_lighting(dColor, NnBump, IN.WorldView, IN.Light0Vec, IN.Light1Vec,
	Lamp0Color, Lamp1Color, AmbiColor, Ks, SpecExpon, diffContrib, specContrib);
	
    float3 result = lerp(diffContrib, studShade.xyz, studShade.w) + specContrib;
	return float4(result,1);
}