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      1 attribute highp   vec3  inVertex;
      2 attribute mediump vec3  inNormal;
      3 attribute mediump vec2  inTexCoord;
      4 
      5 uniform highp   mat4  MVPMatrix;
      6 uniform mediump vec3  LightDirection;
      7 uniform mediump	float  DisplacementFactor;
      8 
      9 varying lowp    float  LightIntensity;
     10 varying mediump vec2   TexCoord;
     11 
     12 uniform sampler2D  sDisMap;
     13 
     14 void main()
     15 {
     16 	/* 
     17 		Calculate the displacemnt value by taking the colour value from our texture
     18 		and scale it by out displacement factor.
     19 	*/
     20 	mediump float disp = texture2D(sDisMap, inTexCoord).r * DisplacementFactor;
     21 
     22 	/* 
     23 		Transform position by the model-view-projection matrix but first
     24 		move the untransformed position along the normal by our displacement
     25 		value.
     26 	*/
     27 	gl_Position = MVPMatrix * vec4(inVertex + (inNormal * disp), 1.0);
     28 
     29 	// Pass through texcoords
     30 	TexCoord = inTexCoord;
     31 	
     32 	// Simple diffuse lighting in model space
     33 	LightIntensity = dot(inNormal, -LightDirection);
     34 }