// global relevant parameters

float4x4 view : View;
float4x4 proj : Projection;
float4x4 world : World;
float4x4 wvp : WorldViewProjection;
float4x4 viewInverse : ViewInverse;

float3 pLightPos[16];
bool   pLightOn[16];
float3 pLightDiffuse[16];
float3 pLightSpecular[16];
float  pLightNear[16];
float  pLightFar[16];

float4 ambientColor : Ambient = { 0.1f, 0.1f, 0.1f, 1.0f };
float4 diffuseColor : Diffuse = { 0.5f, 0.5f, 0.5f, 1.0f };
float4 specularColor : Specular = { 1.0f, 1.0f, 1.0f, 1.0f };
float shininess : SpecularPower = 24.0f;


texture diffuseTexture : Diffuse <...>;
sampler DiffuseTextureSampler = sampler_state {...};
texture bumpTexture : Specular <...>;
sampler BumpTextureSampler = sampler_state {...};







//local relevant variables:
  float4 diffuseTex = tex2D(DiffuseTextureSampler,input.texCoord);
  float3 normalVector = (2.0 * tex2D(BumpTextureSampler, input.texCoord).rgb) - 1.0;
  
  normalVector = normalize(normalVector);
  
  float4 ambientCol = ambientColor;
  float4 diffuseCol = { 0, 0, 0, 1 };
  float4 specularCol = { 0, 0, 0, 1 };








// variable "input" is of type:
struct EngineVertexToPixel
{
    float4 pos : POSITION; //transformed vertex pos
    float2 texCoord : TEXCOORD0; // tex uv
    float3 wPos : TEXCOORD1; // untransformed "naked" pos
    float3 viewVec : TEXCOORD2; // view vector (bumpmapping)
    float3x3 tangentMatrix : TEXCOORD3; // worldspace-to-tangentspace matrix
};








//BROKEN CODE:
//inside the pixel shader

for(int i=0;i<16;i+=1) //pLights
  {
   if(pLightOn[i]) // if the light is activated
   {
    float dist = sqrt( pow(pLightPos[i].x-input.wPos.x,2)+pow(pLightPos[i].y-input.wPos.y,2)+pow(pLightPos[i].z-input.wPos.z,2) ); // light-to-pixel distance
	if(dist < pLightFar[i]) // <<--PROBLEM--<< checks to see if the distance is smaller than the max fadeout for the light
	{
                //bunch of light stuff
		float3 pLightDir = pLightPos[i]-input.wPos;
		float3 pLightVector = normalize(mul(input.tangentMatrix, pLightDir));
	        float bump = saturate(dot(normalVector, pLightVector));
	        float3 reflect = normalize(2 * bump * normalVector - pLightVector);
	        float spec = pow(saturate(dot(reflect, viewVector)), shininess);
		diffuseCol += (saturate(dot(float3(0,0,1), pLightVector))*diffuseColor);
		specularCol += saturate(bump*spec*specularColor);
	}
   }
  }