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attribute vec3 position;
attribute vec3 normal;
attribute vec2 uv;
attribute vec4 boneweights;
attribute vec4 boneindices;

uniform vec4 agk_bonequats1[40];
uniform vec4 agk_bonequats2[40];
	
varying vec3 normalVarying;
varying vec2 uvVarying;
	
uniform vec4 uvBounds0;

uniform mat4 agk_ViewProj;
uniform mat4 agk_World;
	
vec3 transformDQ( vec3 p, vec4 q1, vec4 q2 )
{
   p += 2.0 * cross( q1.xyz, cross(q1.xyz, p) + q1.w*p );
   p += 2.0 * (q1.w*q2.xyz - q2.w*q1.xyz + cross(q1.xyz,q2.xyz));
   return p;
}
	
void main()
{ 
   vec4 q1 = agk_bonequats1[ int(boneindices.x) ] * boneweights.x;
   q1 += agk_bonequats1[ int(boneindices.y) ] * boneweights.y;
   q1 += agk_bonequats1[ int(boneindices.z) ] * boneweights.z;
   q1 += agk_bonequats1[ int(boneindices.w) ] * boneweights.w;
	
   vec4 q2 = agk_bonequats2[ int(boneindices.x) ] * boneweights.x;
   q2 += agk_bonequats2[ int(boneindices.y) ] * boneweights.y;
   q2 += agk_bonequats2[ int(boneindices.z) ] * boneweights.z;
   q2 += agk_bonequats2[ int(boneindices.w) ] * boneweights.w;
	
   float len = 1.0/length(q1);
   q1 *= len;
   //strcat ( srcVertShader, "   q2 *= len; // quicker but less accurate?
   q2 = (q2 - q1*dot(q1,q2)) * len;
	
   vec4 pos = vec4( transformDQ(position,q1,q2), 1.0 );
	
   gl_Position = agk_ViewProj * pos;
   normalVarying = normal + 2.0*cross( q1.xyz, cross(q1.xyz,normal) + q1.w*normal );
   uvVarying = uv * uvBounds0.xy + uvBounds0.zw;
}