//Cg
//
//Cg profile arbvp1 arbfp1

void vshader( in float4 vtx_position  : POSITION,
                in float2 vtx_texcoord0 : TEXCOORD0,
                in float4 vtx_normal : NORMAL,
                in uniform float4x4 mat_modelproj,
                in uniform float3 light_vec,
                in uniform float ambient,
                in uniform float scale,
                out float l_brightness,
                out float4 l_position  : POSITION,
                out float2 l_texcoord0 : TEXCOORD0,
                out float2 l_detail1   : TEXCOORD1,
                out float2 l_detail2   : TEXCOORD2,
                out float2 l_detail3   : TEXCOORD3,
                out float2 l_detail4   : TEXCOORD4 )
{
       l_position = mul(mat_modelproj,vtx_position);
       l_texcoord0 = vtx_texcoord0;
         
      //detail texture coordinates scaled, we must get the correct scale fator to make terrain look like in EarthSculptor
       l_detail1 = vtx_texcoord0 * 9.3;   //27.365000 in EarthSculptor
       l_detail2 = vtx_texcoord0 * 12.8;  //20.000000 in EarthSculptor
       l_detail3 = vtx_texcoord0 * 7.9;   //32.340000 in EarthSculptor
       l_detail4 = vtx_texcoord0 * 11.5;  //22.389999 in EarthSculptor
         
      // lighting
      float3 N = normalize(float3(vtx_normal.x * scale, vtx_normal.y * scale, vtx_normal.z));
      l_brightness = min(max(dot(N, light_vec), 0) + ambient, 1.0);
}

void fshader( in float4 l_position  : POSITION,
                in float2 l_texcoord0 : TEXCOORD0,
                in float2 l_detail1   : TEXCOORD1,
                in float2 l_detail2   : TEXCOORD2,
                in float2 l_detail3   : TEXCOORD3,
                in float2 l_detail4   : TEXCOORD4,
                in float  l_brightness,
                in uniform sampler2D tex_0 : TEXUNIT0,
                in uniform sampler2D tex_1 : TEXUNIT1,
                in uniform sampler2D tex_2 : TEXUNIT2,
                in uniform sampler2D tex_3 : TEXUNIT3,
                in uniform sampler2D tex_4 : TEXUNIT4,
                in uniform sampler2D tex_5 : TEXUNIT5,
                in uniform sampler2D tex_6 : TEXUNIT6,

                out float4 o_color : COLOR )
{
      //add 4 detail colors
      float4 alpha = tex2D(tex_0, l_texcoord0.xy);
      o_color = tex2D(tex_1, l_detail1.xy) * alpha.x
              + tex2D(tex_2, l_detail2.xy) * alpha.y
              + tex2D(tex_3, l_detail3.xy) * alpha.z
              + tex2D(tex_4, l_detail4.xy) * alpha.w;
               
      //color map, there are 3 Color Modes in EarthSculptor
      //o_color = o_color + tex2D(tex_5, l_texcoord0.xy) - 0.5;

      //light map
      //o_color = o_color * tex2D(tex_6, l_texcoord0.xy);
      o_color = o_color * l_brightness;
       
      o_color.a = 1.0;
}

self.terrain.getRoot().setShaderInput('light_vec', Vec3(1,1,1))
             self.terrain.getRoot().setShaderInput('ambient', 0.5)
             self.terrain.getRoot().setShaderInput('scale', 150)