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// FxMap vertex shader  : FXMap_HLSL.vert

float4x4 worldViewProj_matrix; 
float3 lightPosition; 
float3 eyePosition;

struct VS_OUTPUT 
{
  float4 Pos : POSITION;
  float2 UV : TEXCOORD0; 
  float3 LightDir : TEXCOORD1; 
  float3 HalfAngle : TEXCOORD2; 
}; 

VS_OUTPUT main(float4 Pos : POSITION, float2 Tex : TEXCOORD0, float3 Normal : NORMAL, float3 Tangent : TEXCOORD1 ) 
{ 
  VS_OUTPUT Out = (VS_OUTPUT)0; 
  // transform Position 
  Out.Pos = mul(worldViewProj_matrix, Pos); 

  Out.UV = Tex.xy; 

  // calculate tangent space light vector 
  // Get object space light direction 
  float3 lightDir = lightPosition - Pos.xyz; 
  float3 eyeDir = eyePosition - Pos.xyz; 

  // compute the 3x3 tranform matrix 
  // to transform from object space to tangent space 
  float3x3 rotation; 
  rotation[0] = Tangent; 
  // calculate the binormal (NB we assume both normal and tangent are 
  // already normalised) 
  rotation[1] = cross(Tangent, Normal); 
  rotation[2] = Normal; 

  // rotate the light and eye vectors according to tangent space rotation matrix 
  lightDir = normalize(mul(rotation, lightDir)); 
  eyeDir = normalize( mul(rotation, eyeDir) ); 

  Out.LightDir = lightDir; 
  Out.HalfAngle = normalize(eyeDir + lightDir); 

  return Out; 
} 

Code: Select all

// Fx Map pixel shader : FXMap_HLSL.frag

float4 ambientColor; 
sampler normalMap; 
sampler diffuseMap; 
sampler fxMap; 
/* 
  Fx Map has the following data in the color channels 
  RED: specular intensity 
  GREEN: specular size (power exponent) 
  BLUE: diffuse intensity 
  ALPHA: ambient/emmisive intensity (optional) 
*/ 

float diffuse(float3 LightDir, float3 N, float diffLevel) 
{ 
  return max(dot(normalize(LightDir), N), 0.0) * diffLevel; 
} 

float specular(float3 HalfAngle, float3 N, float specLevel, float specPower) 
{ 
  return specLevel * pow(max( dot( normalize(HalfAngle), N), 0.0), 128.0 * specPower ) ; 
} 


float4 main(float2 UV: TEXCOORD0, float3 LightDir : TEXCOORD1, 
float3 HalfAngle : TEXCOORD2) : COLOR 
{ 
  float4 texdiff = tex2D(diffuseMap, UV); 
  // expand the normal vector from the normal map form 0..1 to -1..1 
  float3 N = tex2D(normalMap, UV).xyz * 2 - 1; 
  float4 fxVals = tex2D(fxMap, UV); 

  return texdiff * (ambientColor * fxVals.w + diffuse(LightDir, N, fxVals.z)) + specular(HalfAngle, N, fxVals.x, fxVals.y); 
}