source: GTP/trunk/App/Demos/Illum/IBRBillboardCloudTrees/OGRE/IBRTreesOGRE/media/oldgeneral/tree_idtexturing_fp.shd @ 1493

//float4 main_fp(float2 texCoord: TEXCOORD0, float2 texCoordNormalized: TEXCOORD1) : COLOR
//{
//      // DirectX
//      return float4((tex2D(orderFrontBack, texCoord).w > 0.0) ? tex2D(leaf,((texCoordNormalized - tex2D(orderFrontBack, texCoord).xy) + float2(0.0,0.0)) * 4.0) : 0.0);
//}

   /*
   normal = normalize(normal);
   // Radial distance
   float depth = length(lightVec);
   // Normalizes light vector
   lightVec /= depth;

   // Standard lighting
   float odiffuse = saturate(dot(lightVec, normal));
   float ospecular = pow(saturate(dot(reflect(-normalize(viewVec), normal), lightVec)), 16);

   // The depth of the fragment closest to the light
   float shadowMap = tex2Dproj(shadowMap, shadowCrd);
   // A spot image of the spotlight
   float spotLight = tex2Dproj(spotLight, shadowCrd);
   // If the depth is larger than the stored depth, this fragment
   // is not the closest to the light, that is we are in shadow.
   // Otherwise, we're lit. Add a bias to avoid precision issues
   float shadow;
   shadow = (depth < shadowMap + shadowBias);

   // Cut back-projection, that is, make sure we don't lit
   // anything behind the light. Theoretically, you should just
   // cut at w = 0, but in practice you'll have to cut at a
   // fairly high positive number to avoid precision issue when
   // coordinates approaches zero. 
   shadow *= (shadowCrd.w > backProjectionCut);
   // Modulate with spotlight image
   shadow *= spotLight;

   // Shadow any light contribution except ambient
   //float4 tempcolor = (tex2D(orderFrontBack, texCoord).w > 0.0) ? tex2D(leaf,((texCoordNormalized - tex2D(orderFrontBack, texCoord).xy) + float2(0.0,0.0)) * 4.0) : 0.0;
   tempcolor = (tex2D(orderFrontBack, texCoord).x >= 0.0) ? tex2D(leaf,((texCoordNormalized - tex2D(orderFrontBack, texCoord).xy) + tex2D(orderFrontBack, texCoord).zw) * 4.0) : 0.0;
   // green test
   //tempcolor.xyz = float3(0.0,0.5,0.2);
   // Look the different leaves orientations used...
   //float4 tempcolor = (tex2D(orderFrontBack, texCoord).x >= 0.0) ? float4(tex2D(orderFrontBack, texCoord).zw,1.0,1.0) : 0.0;

   tempcolor = float4(lattenuation * (Ka*(gambient.xyz)) + (Kd*(odiffuse * tempcolor.xyz * ldiffuse)) + (Ks * (ospecular * lspecular)),tempcolor.w * 0.5);         
   //return float4((tex2D(orderFrontBack, texCoord).w > 0.0) ? tex2D(leaf,((texCoordNormalized - tex2D(orderFrontBack, texCoord).xy) + float2(0.0,0.0)) * 4.0) : 0.0); 
   
   //else
   //{
   //   tempcolor = float4(0.0,1.0,0.0,1.0);
   //}
   */
   
float4x4 worldmatrix;
float tex_atlas_size;
float scale_factor;
float3 ldiffuse;
float3 lspecular;
float3 lattenuation;
float4 gambient;
float Ka;
float Kd;
float Ks;
sampler orderFrontBack: register(s0);
sampler leaf: register(s1);
sampler shadowMap: register(s2);
sampler spotLight: register(s3);

float shadowBias = 45.57;
float backProjectionCut = 0.0;
float4 main_fp(float reg: VFACE, float3 normal: TEXCOORD0, float3 lightVec: TEXCOORD1, float3 viewVec: TEXCOORD2, float4 shadowCrd: TEXCOORD3, float4 texCoord: TEXCOORD4, float4 texCoordNormalized: TEXCOORD5) : COLOR
{
   float4 tempcolor;
   float4 ocolor;

   normal = normalize(normal);
   // Front and Back faces lighted
   normal = (reg > 0.0) ? normal : -normal;

   // Radial distance
   float depth = length(lightVec);
   // Normalizes light vector
   lightVec /= depth;

   // Standard lighting
   float odiffuse = saturate(dot(lightVec, normal));
   float ospecular = pow(saturate(dot(reflect(-normalize(viewVec), normal), lightVec)), 16);

   // The depth of the fragment closest to the light
   float shadowMap = tex2Dproj(shadowMap, shadowCrd);
   // A spot image of the spotlight
   float spotLight = tex2Dproj(spotLight, shadowCrd);
   // If the depth is larger than the stored depth, this fragment
   // is not the closest to the light, that is we are in shadow.
   // Otherwise, we're lit. Add a bias to avoid precision issues
   float shadow;
   shadow = (depth < shadowMap + shadowBias);

   // Cut back-projection, that is, make sure we don't lit
   // anything behind the light. Theoretically, you should just
   // cut at w = 0, but in practice you'll have to cut at a
   // fairly high positive number to avoid precision issue when
   // coordinates approaches zero. 
   shadow *= (shadowCrd.w > backProjectionCut);
   // Modulate with spotlight image
   //shadow *= spotLight;

   // Shadow any light contribution except ambient
   tempcolor = (tex2D(orderFrontBack, texCoord).x >= 0.0) ? tex2D(leaf,((texCoordNormalized - tex2D(orderFrontBack, texCoord).xy) + tex2D(orderFrontBack, texCoord).zw) * 4.0) : 0.0;

   
   // green test
   //tempcolor.xyz = float3(0.0,0.5,0.2);
        
   tempcolor = float4((Ka*(gambient.xyz)) + (Kd*(odiffuse * tempcolor.xyz * ldiffuse)) + (Ks * (ospecular * lspecular)),tempcolor.w);      

   // Look the different leaves orientations used...
   //tempcolor = (tex2D(orderFrontBack, texCoord).x >= 0.0) ? float4(tex2D(orderFrontBack, texCoord).zw,1.0,1.0) : 0.0;
   // Check the AATexQuads of the leaves...
   //tempcolor = (tex2D(orderFrontBack, texCoord).x >= 0.0) ? float4(tex2D(orderFrontBack, texCoord).xy,1.0,1.0) : 0.0;
   
   // Shows each side the front and the back side...
   //tempcolor = (reg > 0.0) ? float4(1.0,0.0,0.0,tempcolor.w) : float4(0.0,1.0,0.0,tempcolor.w);
        
   ocolor = tempcolor;
   return  ocolor;
}