//
// cgfxBuild $Revision: #1 $ (C)2003-2006 NVIDIA Corporation
//
// 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.
//

// Uses Phong (default) Specular BRDF //

////////////////////////////////////////////////////////////
//////////////////////////////////////////// Untweakables //
////////////////////////////////////////////////////////////

float4x4 WorldITXf : WorldInverseTranspose < string UIWidget="none";>;
float4x4 WVPXf : WorldViewProjection < string UIWidget="none";>;
float4x4 WorldXf : World < string UIWidget="none";>;
float4x4 ViewITXf : ViewInverseTranspose < string UIWidget="none";>;

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

//
// Ambient //////////////////////////////////
//
float3 AmbientColor <
    string UIWidget = "Color";
    string UIName = "Ambient";
> = {1,1,1};
float AmbientIntensity <
	string UIWidget = "slider";
	string UIName = "Ambient Intensity";
	float UIMin = 0;
	float UIMax = 1;
> = 0.05;

//
// Directional0 /////////////////////////////
//
float3 Directional0Color <
    string UIWidget = "Color";
    string UIName = "Directional0";
> = {1,1,1};
float Directional0Intensity <
	string UIWidget = "slider";
	string UIName = "Directional0 Intensity";
	float UIMin = 0;
	float UIMax = 1;
> = 1;

float3 Directional0Dir <
    string Object = "DirectionalLight";
    string Space = "World";
    string UIName = "Directional0 Direction";
> = {0.707,-0.707,-0.707};

//
// Surface Parameters //////////////////////////////////////
//
// SurfColor (Untextured)
float3 SurfColor : DIFFUSE <
    string UIWidget = "Color";
    string UIName = "SurfColor";
> = {1,1,1};

// AmbiColor (Untextured)
float3 AmbiColor : AMBIENT <
    string UIWidget = "Color";
    string UIName = "AmbiColor";
> = {1,1,1};

// Incandescence (Untextured)
float3 Incandescence : AMBIENT <
    string UIWidget = "Color";
    string UIName = "Incandescence";
> = {0,0,0};

float kDiffuse <
	string UIWidget = "slider";
	string UIName = "Diffuse Strength";
	float UIMin = 0;
	float UIMax = 1;
> = 0.9;

// Ks (Untextured)
float Ks : SPECULAR <
	string UIWidget = "slider";
	string UIName = "Hilight Strength";
	float UIMin = 0;
	float UIMax = 1;
> = 0.6;


float specExpon <
	string UIWidget = "slider";
	string UIName = "Highlight Sharpness (Power)";
	float UIMin = 0;
	float UIMax = 128;
> = 12;

////////////////////////////////////////////////////////////
////////////////////////////////// Structs and Connectors //
////////////////////////////////////////////////////////////

//
// Vertex Buffer Structure //////////////////
//
struct appdata {
	float3 Position	: POSITION;
	float4 UV	: TEXCOORD0;
	float4 Normal	: NORMAL0;
	float4 Tangent	: TANGENT0;
	float4 Binormal	: BINORMAL0;
};

//
// Ambient Shader Connector /////////////////
//
struct ambiVertexOutput {
	float4 HPosition	: POSITION;
	float2 UV		: TEXCOORD0;
	float3 WorldView	: TEXCOORD4;
};
//
// Directional Shader Connector /////////////
//
struct dirVertexOutput {
	float4 HPosition	: POSITION;
	float2 UV		: TEXCOORD0;
	float3 WorldNormal	: TEXCOORD2;
	float3 WorldPos		: TEXCOORD3;
	float3 WorldView	: TEXCOORD4;
};

////////////////////////////////////////////////////////////
///////////////////////////////////////// Shader Programs //
////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////
// Vertex Shaders //////////////////////////////////////////
////////////////////////////////////////////////////////////


//
// Ambient Vertex Shader ////////////////////
//
ambiVertexOutput ambi_vp(appdata IN) {
	ambiVertexOutput OUT = (ambiVertexOutput)0;
	float4 Po = float4(IN.Position.xyz, 1.0);
	float3 Pw = mul(WorldXf, Po).xyz;
	OUT.UV = IN.UV.xy;
	OUT.WorldView = normalize(ViewITXf[3].xyz - Pw);
	OUT.HPosition = mul(WVPXf, Po);
	return OUT;
}

//
// Directional Vertex Shader ////////////////
//
dirVertexOutput directional_vp(appdata IN)
{
	dirVertexOutput OUT = (dirVertexOutput)0;
	OUT.WorldNormal = mul(WorldITXf, IN.Normal).xyz;
	float4 Po = float4(IN.Position.x,IN.Position.y,IN.Position.z,1.0);
	float3 Pw = mul(WorldXf, Po).xyz;
	OUT.WorldPos = Pw;
	OUT.UV = IN.UV.xy;
	OUT.WorldView = normalize(ViewITXf[3].xyz - Pw);
	OUT.HPosition = mul(WVPXf, Po);
	return OUT;
}

////////////////////////////////////////////////////////////
// Fragment Shaders ////////////////////////////////////////
////////////////////////////////////////////////////////////


//
// Ambient Fragment Shader //////////////////
//
float4 ambi_fp(ambiVertexOutput IN,
	uniform float3 SurfColor,
	uniform float3 AmbiColor,
	uniform float3 Incandescence,
	uniform float3 AmbientColor,
	uniform float AmbientLightIntensity) : COLOR {
	float3 result = AmbientLightIntensity*SurfColor.xyz*AmbientColor*AmbiColor.xyz + Incandescence.xyz;
	return float4(result.xyz,1);
}

//
// Directional Fragment Shader //////////////
//
float4 directional_fp(dirVertexOutput IN,
	uniform float3 SurfColor,
	uniform float Kd,
	uniform float Ks,
	uniform float SpecExpon,
	uniform float3 LightColor,
	uniform float LightIntensity,
	uniform float3 LightDir) : COLOR {
	float3 Nn = normalize(IN.WorldNormal);
	float3 Ln = -normalize(LightDir);
	float ldn = dot(Ln,Nn);
	float3 Vn = normalize(IN.WorldView);
	float3 Hn = normalize(Vn + Ln);
	float hdn = dot(Hn,Nn);
	float4 litV = lit(ldn,hdn,SpecExpon);
	ldn = litV.y * LightIntensity;
	hdn = Ks * ldn * litV.z;
	float3 result = ((Kd*ldn*SurfColor.xyz) + hdn) * LightColor;
	return float4(result.xyz,1.0);
}

////////////////////////////////////////////////////////////
////////////////////////////////////////////// Techniques //
////////////////////////////////////////////////////////////

technique main {
	// Ambient
	pass AmbientPass {
	    VertexProgram = compile vp40 ambi_vp();
	    DepthTestEnable = true;
	    DepthMask = true;
	    CullFaceEnable = false;
	    BlendEnable = false;
	    FragmentProgram = compile fp40 ambi_fp(
			SurfColor,
			AmbiColor,
			Incandescence,
		AmbientColor,
		AmbientIntensity);
	}
	// Directional0
	pass Directional0Pass {
		VertexProgram = compile vp40 directional_vp();
		DepthTestEnable = true;
		DepthMask = false;
		DepthFunc = LEqual;
		CullFaceEnable = false;
		BlendEnable = true;
		BlendFunc = int2(One,One);
		FragmentProgram = compile fp40 directional_fp(
			SurfColor,
			kDiffuse,
			Ks,
			specExpon,
			Directional0Color,
			Directional0Intensity,
			Directional0Dir);
	}
}

///////////////////////////////////////////////////// EOF //