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// constant values sent through from AGK code.
uniform sampler2D texture0; 
uniform sampler2D texture1; 
uniform sampler2D texture2;
uniform sampler2D texture3;
uniform sampler2D texture4;
uniform sampler2D texture5;
uniform sampler2D texture6;
uniform sampler2D texture7;


uniform vec4 fade;
uniform vec4 fade2;

uniform highp vec4 agk_bonequats1[100];
uniform highp vec4 agk_bonequats2[100];

// Anything that the vertex shader passes as output needs to 
// be defined here as input. The vertex shader is passing the 
// texture coordinate, so it is defined again here.


varying vec2 uv0Varying;
varying vec2 uv1Varying;
varying vec2 uv2Varying; 
varying vec2 uv3Varying;
varying vec2 uv4Varying;
varying vec2 uv5Varying;
varying vec2 uv6Varying;
varying vec2 uv7Varying;





void main()

{
  // copy the textures coords
vec2 texCoord0 = uv0Varying;
vec2 texCoord1 = uv1Varying;
vec2 texCoord2 = uv2Varying;
vec2 texCoord3 = uv3Varying;
vec2 texCoord4 = uv4Varying; 
vec2 texCoord5 = uv5Varying; 
vec2 texCoord6 = uv6Varying; 
vec2 texCoord7 = uv7Varying; 


vec4 colorResult0  = texture2D(texture0, texCoord0);
vec4 colorResult1  = texture2D(texture1, texCoord0); 
vec4 colorResult2  = texture2D(texture2, texCoord0);   
vec4 colorResult3  = texture2D(texture3, texCoord0);  
vec4 colorResult4  = texture2D(texture4, texCoord0);  
vec4 colorResult5  = texture2D(texture5, texCoord0);  
vec4 colorResult6  = texture2D(texture6, texCoord0);  
vec4 colorResult7  = texture2D(texture7, texCoord0);  


colorResult1.a *= fade.x;
colorResult2.a *= fade.y;
colorResult3.a *= fade.z;
colorResult4.a *= fade.w;
colorResult5.a *= fade2.x;
colorResult6.a *= fade2.y;
colorResult7.a *= fade2.z;



gl_FragColor = mix(colorResult0, colorResult1, colorResult1.a); 
gl_FragColor = mix(gl_FragColor, colorResult2, colorResult2.a);
gl_FragColor = mix(gl_FragColor, colorResult3, colorResult3.a);
gl_FragColor = mix(gl_FragColor, colorResult4, colorResult4.a);
gl_FragColor = mix(gl_FragColor, colorResult5, colorResult5.a);
gl_FragColor = mix(gl_FragColor, colorResult6, colorResult6.a);
gl_FragColor = mix(gl_FragColor, colorResult7, colorResult7.a);

}

attribute highp vec3 position;
attribute mediump vec3 normal;



   
varying vec2 uv0Varying;
varying vec2 uv1Varying;
varying vec2 uv2Varying;
varying vec2 uv3Varying;
varying vec2 uv4Varying;
varying vec2 uv5Varying;
varying vec2 uv6Varying;
varying vec2 uv7Varying;



varying highp vec3 posVarying;
varying mediump vec3 normalVarying;
varying mediump vec3 lightVarying;
mediump vec3 GetVSLighting( mediump vec3 normal, highp vec3 pos );
 
uniform highp mat4 agk_ViewProj;
attribute highp vec2 uv;
varying highp vec2 uvVarying;
uniform highp vec4 uvBounds0;
 
attribute highp vec4 boneweights;
attribute mediump vec4 boneindices;
uniform highp vec4 agk_bonequats1[28];
uniform highp vec4 agk_bonequats2[28];
 
highp vec3 transformDQ( highp vec3 p, highp vec4 q1, highp 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()
{ 
    uv0Varying = uv * uvBounds0.xy + uvBounds0.zw;
    uvVarying = uv * uvBounds0.xy + uvBounds0.zw;
    highp 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;
    highp 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;
    highp float len = 1.0/length(q1);
    q1 *= len;
    q2 = (q2 - q1*dot(q1,q2)) * len;
    highp 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 );
    posVarying = pos.xyz;
    lightVarying = GetVSLighting( normalVarying, posVarying );



     
}