// Offset mapping options:
//	  texture: defaults to material_name.png.
//		 This specifies which texture (in the form of a file such as wall.png) will be
//		applied to the material.
//
//	  offset_map: defaults to texture_filename_normals.texture_extension
//				  (example :texture => "wall.png" offset_map will be "wall_normals.png")
//		  The normal map (defined in tangent space) for the object( to simulate detail ).
//
//    generate_tangents:  defaults to true.
//       This will generate the tangents for the loaded mesh, but if you do not move the
//		mesh throughout the scene, there is no need.
//

<% @texture ||= "#{name}.png" %>
<% tangent_space = @generate_tangents %>
<% tangent_space = true if @generate_tangents.nil? %>
<% @offset_map ||= "#{texture.split('.')[0]}_normals.#{texture.split('.')[1]}"%>

material <%= name %>
{ 

  // This is the preferred technique which uses both vertex and 
   // fragment programs, supports coloured lights 
   technique 
   { 
      // do the lighting  and bump mapping with parallax pass 
      // NB we don't do decal texture here because this is repeated per light 
      pass 
      { 
		 // Vertex program reference 
         vertex_program_ref OffsetMappingVP 
         { 
            param_named_auto lightPosition light_position_object_space 0 
            param_named_auto eyePosition camera_position_object_space 
            param_named_auto worldViewProj worldviewproj_matrix 
         } 

         // Fragment program 
         fragment_program_ref OffsetMappingFP
         { 
            param_named_auto lightDiffuse light_diffuse_colour 0 
            param_named_auto lightSpecular light_specular_colour 0 
            // Parallax Height scale and bias 
            param_named scaleBias float4 0.04 -0.02 1 0 
         } 
          
         // Normal + height(alpha) map 
         texture_unit 
         { 
            texture <%= offset_map %> 
		 } 

         // Base diffuse texture map 
         texture_unit 
         { 
			texture <%= texture %>
         }
      } 
   } 


   // This is the preferred technique which uses both vertex and 
   // fragment programs, supports coloured lights 
   technique 
   { 
      // do the lighting  and bump mapping with parallax pass 
      // NB we don't do decal texture here because this is repeated per light 
      pass 
      { 
       
		// Vertex program reference 
         vertex_program_ref OffsetMappingVP 
         { 
            param_named_auto lightPosition light_position_object_space 0 
            param_named_auto eyePosition camera_position_object_space 
            param_named_auto worldViewProj worldviewproj_matrix 
         } 

         // Fragment program 
         fragment_program_ref OffsetMappingPS 
         { 
            param_indexed_auto 0 light_diffuse_colour 0 
            param_indexed_auto 1 light_specular_colour 0 
            // Parallax Height scale and bias 
            param_indexed 2 float4 0.04 -0.02 1 0 
         } 
          
         // Normal + height(alpha) map 
         texture_unit 
         { 
            texture <%= offset_map %>
         } 

         // Base diffuse texture map 
         texture_unit 
         { 
			texture <%= texture %>
         } 
      } 
   } 
   
   // Simple no-shader fallback
   technique 
   { 
      pass 
      { 
         // Base diffuse texture map 
         texture_unit 
         { 
				texture <%= texture %>
         } 
	  }
   }

}