normalMap Shader
float4 AmbientColor : Ambient
<
string UIName = "Ambient Color";
> = {0.25f, 0.25f, 0.25f, 1.0f};
float4 DiffuseColor : Diffuse
<
string UIName = "Diffuse Color";
> = {1.0f, 1.0f, 1.0f, 1.0f};
texture diffuseMap : DiffuseMap
<
string name = "default_color.dds";
string UIName = "Diffuse Texture";
string TextureType = "2D";
>;
texture normalMap : NormalMap
<
string name = "default_bump_normal.dds";
string UIName = "Normal Map";
string TextureType = "2D";
>;
/************** light info **************/
float4 light1Pos : POSITION
<
string UIName = "Light Position";
string Object = "PointLight";
string Space = "World";
int refID = 0;
> = {100.0f, 100.0f, 100.0f, 0.0f};
float4 light1Color : LIGHTCOLOR
<
int LightRef = 0;
> = { 1.0f, 1.0f, 1.0f, 0.0f };
/****************************************************/
/********** SAMPLERS ********************************/
/****************************************************/
sampler2D diffuseMapSampler = sampler_state
{
Texture = <diffuseMap>;
MinFilter = Linear;
MagFilter = Linear;
MipFilter = Anisotropic;
ADDRESSU = WRAP;
ADDRESSV = WRAP;
};
sampler2D normalMapSampler = sampler_state
{
Texture = <normalMap>;
MinFilter = Linear;
MagFilter = Linear;
MipFilter = Anisotropic;
ADDRESSU = WRAP;
ADDRESSV = WRAP;
};
/***********************************************/
/*** automatically-tracked "tweakables" ********/
/***********************************************/
float4x4 WorldViewProjection : WorldViewProjection < string UIWidget = "None"; >;
float4x4 WorldInverseTranspose : WorldInverseTranspose < string UIWidget = "None"; >;
float4x4 ViewInverse : ViewInverse < string UIWidget = "None"; >;
float4x4 World : World < string UIWidget = "None"; >;
/****************************************************/
/********** CG SHADER FUNCTIONS *********************/
/****************************************************/
// input from application
struct a2v {
float4 position : POSITION;
float2 texCoord : TEXCOORD0;
float3 normal : NORMAL;
float3 binormal : BINORMAL;
float3 tangent : TANGENT;
};
// output to fragment program
struct v2f {
float4 position : POSITION;
float2 texCoord : TEXCOORD0;
float3 lightVec : TEXCOORD1;
float3 worldNormal : TEXCOORD2;
float3 worldBinormal : TEXCOORD3;
float3 worldTangent : TEXCOORD4;
};
/**************************************/
/***** VERTEX SHADER ******************/
/**************************************/
v2f v(a2v In, uniform float4 lightPosition)
{
v2f Out; //create the output struct
Out.worldNormal = mul(In.normal, WorldInverseTranspose).xyz; //put the normal in world space pass it to the pixel shader
Out.worldBinormal = mul(In.binormal, WorldInverseTranspose).xyz; //put the binormal in world space pass it to the pixel shader
Out.worldTangent = mul(In.tangent, WorldInverseTranspose).xyz; //put the tangent in world space pass it to the pixel shader
float3 worldSpacePos = mul(In.position, World); //put the vertex in world space
Out.lightVec = lightPosition - worldSpacePos; //create the world space light vector and pass it to the pixel shader
Out.texCoord.xy = In.texCoord; //pass the UV coordinates to the pixel shader
Out.position = mul(In.position, WorldViewProjection); //put the vertex position in clip space and pass it to the pixel shader
return Out;
}
/**************************************/
/***** FRAGMENT PROGRAM ***************/
/**************************************/
float4 f(v2f In,uniform float4 lightColor) : COLOR
{
//fetch the diffuse and normal maps
float4 ColorTexture = tex2D(diffuseMapSampler, In.texCoord.xy); //the tex2d function takes the texture sampler and the texture coordinates and returns the texel color at that point
float3 normal = tex2D(normalMapSampler, In.texCoord).xyz * 2.0 - 1.0; //the normal must be expanded from 0-1 to -1 to 1
//create tangent space vectors
float3 Nn = In.worldNormal;
float3 Bn = In.worldBinormal;
float3 Tn = In.worldTangent;
//offset world space normal with normal map values
float3 N = (normal.z * Nn) + (normal.x * Bn) + (normal.y * -Tn); //we use the values of the normal map to tweek surface normal, tangent, and binormal
N = normalize(N); //normalizing the result gives us the new surface normal
//create lighting vectors - view vector and light vector
float3 L = normalize(In.lightVec.xyz); //the light vector must be normalized here so all vectors will be normalized
//lighting
//ambient light
float4 Ambient = AmbientColor * ColorTexture; //To create the ambient term, we multiply the ambient color and the diffuse texture
//diffuse light
float4 diffuselight = saturate(dot(N,L)) * lightColor; //To get the diffuse light value we calculate the dot product between the light vector and the normal
float4 Diffuse = DiffuseColor * ColorTexture * diffuselight; //To get the final diffuse color we multiply the diffuse color by the diffuse texture
return Diffuse + Ambient;
}
/****************************************************/
/********** TECHNIQUES ******************************/
/****************************************************/
technique regular
{
pass one
{
VertexShader = compile vs_1_1 v(light1Pos); //here we call the vertex shader function and tell it we want to use VS 1.1 as the profile
ZEnable = true; //this enables sorting based on the Z buffer
ZWriteEnable = true; //this writes the depth value to the Z buffer so other objects will sort correctly this this one
CullMode = CW; //this enables backface culling. CW stands for clockwise. You can change it to CCW, or none if you want.
AlphaBlendEnable = false; //This disables transparency. If you make it true, the alpha value of the final pixel shader color will determine how transparent the surface is.
PixelShader = compile ps_2_0 f(light1Color); //here we call the pixel shader function and tell it we want to use the PS 2.0 profile
}
}
