//
//  Draw the unit quad [-1,-1 -> 1,1] amd pass along the unit texcoords [0, 0 -> 1, 1]. Not transform used.
//  Simply draw a Triangle_strip of 2 triangles, no input buffers or index buffer needed
//
//  Created by Sam Gateau on 6/22/2015
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
out vec2 varTexCoord0;

void main(void) {
    const float depth = 1.0;
    const vec4 UNIT_QUAD[4] = vec4[4](
        vec4(-1.0, -1.0, depth, 1.0),
        vec4(1.0, -1.0, depth, 1.0),
        vec4(-1.0, 1.0, depth, 1.0),
        vec4(1.0, 1.0, depth, 1.0)
    );
    vec4 pos = UNIT_QUAD[gl_VertexID];

    varTexCoord0 = (pos.xy + 1) * 0.5;

    gl_Position = pos;
}

   #version 410 core
//  Generated on Wed Mar 02 02:25:32 2016
//
//  Draw and transform the unit quad [-1,-1 -> 1,1]
//  Simply draw a Triangle_strip of 2 triangles, no input buffers or index buffer needed
//
//  Created by Sam Gateau on 6/22/2015
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

struct TransformObject {
    mat4 _model;
    mat4 _modelInverse;
};

layout(location=15) in ivec2 _drawCallInfo;

uniform samplerBuffer transformObjectBuffer;

TransformObject getTransformObject() {
    int offset = 8 * _drawCallInfo.x;
    TransformObject object;
    object._model[0] = texelFetch(transformObjectBuffer, offset);
    object._model[1] = texelFetch(transformObjectBuffer, offset + 1);
    object._model[2] = texelFetch(transformObjectBuffer, offset + 2);
    object._model[3] = texelFetch(transformObjectBuffer, offset + 3);

    object._modelInverse[0] = texelFetch(transformObjectBuffer, offset + 4);
    object._modelInverse[1] = texelFetch(transformObjectBuffer, offset + 5);
    object._modelInverse[2] = texelFetch(transformObjectBuffer, offset + 6);
    object._modelInverse[3] = texelFetch(transformObjectBuffer, offset + 7);

    return object;
}

struct TransformCamera {
    mat4 _view;
    mat4 _viewInverse;
    mat4 _projectionViewUntranslated;
    mat4 _projection;
    mat4 _projectionInverse;
    vec4 _viewport;
};

layout(std140) uniform transformCameraBuffer {
    TransformCamera _camera;
};
TransformCamera getTransformCamera() {
    return _camera;
}



out vec2 varTexCoord0;

void main(void) {
    const vec4 UNIT_QUAD[4] = vec4[4](
        vec4(-1.0, -1.0, 0.0, 1.0),
        vec4(1.0, -1.0, 0.0, 1.0),
        vec4(-1.0, 1.0, 0.0, 1.0),
        vec4(1.0, 1.0, 0.0, 1.0)
    );
    vec4 pos = UNIT_QUAD[gl_VertexID];

    // standard transform
    TransformCamera cam = getTransformCamera();
    TransformObject obj = getTransformObject();
    { // transformModelToClipPos
        vec4 _eyepos = (obj._model * pos) + vec4(-pos.w * cam._viewInverse[3].xyz, 0.0);
        gl_Position = cam._projectionViewUntranslated * _eyepos;
    }


    varTexCoord0 = (pos.xy + 1) * 0.5;
}

                #version 410 core
//  Generated on Wed Mar 02 02:25:32 2016
//
//  Draw and transform the unit quad [-1,-1 -> 1,1]
//  Transform the normalized texcoords [0, 1] to be in the range [texcoordRect.xy, texcoordRect.xy + texcoordRect.zw]
//  Simply draw a Triangle_strip of 2 triangles, no input buffers or index buffer needed
//
//  Created by Sam Gateau on 6/22/2015
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

struct TransformObject {
    mat4 _model;
    mat4 _modelInverse;
};

layout(location=15) in ivec2 _drawCallInfo;

uniform samplerBuffer transformObjectBuffer;

TransformObject getTransformObject() {
    int offset = 8 * _drawCallInfo.x;
    TransformObject object;
    object._model[0] = texelFetch(transformObjectBuffer, offset);
    object._model[1] = texelFetch(transformObjectBuffer, offset + 1);
    object._model[2] = texelFetch(transformObjectBuffer, offset + 2);
    object._model[3] = texelFetch(transformObjectBuffer, offset + 3);

    object._modelInverse[0] = texelFetch(transformObjectBuffer, offset + 4);
    object._modelInverse[1] = texelFetch(transformObjectBuffer, offset + 5);
    object._modelInverse[2] = texelFetch(transformObjectBuffer, offset + 6);
    object._modelInverse[3] = texelFetch(transformObjectBuffer, offset + 7);

    return object;
}

struct TransformCamera {
    mat4 _view;
    mat4 _viewInverse;
    mat4 _projectionViewUntranslated;
    mat4 _projection;
    mat4 _projectionInverse;
    vec4 _viewport;
};

layout(std140) uniform transformCameraBuffer {
    TransformCamera _camera;
};
TransformCamera getTransformCamera() {
    return _camera;
}



uniform vec4 texcoordRect;

out vec2 varTexCoord0;

void main(void) {
    const vec4 UNIT_QUAD[4] = vec4[4](
        vec4(-1.0, -1.0, 0.0, 1.0),
        vec4(1.0, -1.0, 0.0, 1.0),
        vec4(-1.0, 1.0, 0.0, 1.0),
        vec4(1.0, 1.0, 0.0, 1.0)
    );
    vec4 pos = UNIT_QUAD[gl_VertexID];

    // standard transform
    TransformCamera cam = getTransformCamera();
    TransformObject obj = getTransformObject();
    { // transformModelToClipPos
        vec4 _eyepos = (obj._model * pos) + vec4(-pos.w * cam._viewInverse[3].xyz, 0.0);
        gl_Position = cam._projectionViewUntranslated * _eyepos;
    }


    varTexCoord0 = ((pos.xy + 1) * 0.5) * texcoordRect.zw + texcoordRect.xy;
}

        #version 410 core
//  Generated on Wed Mar 02 02:25:32 2016
//
//  Draw the unit quad [-1,-1 -> 1,1] filling in 
//  Simply draw a Triangle_strip of 2 triangles, no input buffers or index buffer needed
//
//  Created by Sam Gateau on 6/22/2015
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

struct TransformObject {
    mat4 _model;
    mat4 _modelInverse;
};

layout(location=15) in ivec2 _drawCallInfo;

uniform samplerBuffer transformObjectBuffer;

TransformObject getTransformObject() {
    int offset = 8 * _drawCallInfo.x;
    TransformObject object;
    object._model[0] = texelFetch(transformObjectBuffer, offset);
    object._model[1] = texelFetch(transformObjectBuffer, offset + 1);
    object._model[2] = texelFetch(transformObjectBuffer, offset + 2);
    object._model[3] = texelFetch(transformObjectBuffer, offset + 3);

    object._modelInverse[0] = texelFetch(transformObjectBuffer, offset + 4);
    object._modelInverse[1] = texelFetch(transformObjectBuffer, offset + 5);
    object._modelInverse[2] = texelFetch(transformObjectBuffer, offset + 6);
    object._modelInverse[3] = texelFetch(transformObjectBuffer, offset + 7);

    return object;
}

struct TransformCamera {
    mat4 _view;
    mat4 _viewInverse;
    mat4 _projectionViewUntranslated;
    mat4 _projection;
    mat4 _projectionInverse;
    vec4 _viewport;
};

layout(std140) uniform transformCameraBuffer {
    TransformCamera _camera;
};
TransformCamera getTransformCamera() {
    return _camera;
}



out vec2 varTexCoord0;

void main(void) {
    const vec4 UNIT_QUAD[4] = vec4[4](
        vec4(-1.0, -1.0, 0.0, 1.0),
        vec4(1.0, -1.0, 0.0, 1.0),
        vec4(-1.0, 1.0, 0.0, 1.0),
        vec4(1.0, 1.0, 0.0, 1.0)
    );
    vec4 pos = UNIT_QUAD[gl_VertexID];

    // standard transform but applied to the Texcoord
    vec4 tc = vec4((pos.xy + 1) * 0.5, pos.zw);

    TransformObject obj = getTransformObject();
    { // transformModelToWorldPos
        tc = (obj._model * tc);
    }


    gl_Position = pos;
    varTexCoord0 = tc.xy;
}

    #version 410 core
//  Generated on Wed Mar 02 02:25:32 2016
//
//  Draw texture 0 fetched at texcoord.xy
//
//  Created by Sam Gateau on 6/22/2015
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//


uniform sampler2D colorMap;

in vec2 varTexCoord0;
out vec4 outFragColor;

void main(void) {
    outFragColor = texture(colorMap, varTexCoord0);
}

          #version 410 core
//  Generated on Wed Mar 02 02:25:32 2016
//
//  Draw texture 0 fetched at texcoord.xy
// Alpha is 1
//
//  Created by Sam Gateau on 6/22/2015
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//


uniform sampler2D colorMap;

in vec2 varTexCoord0;
out vec4 outFragColor;

void main(void) {
    outFragColor = vec4(texture(colorMap, varTexCoord0).xyz, 1.0);
}

             #version 410 core
//  Generated on Wed Mar 02 02:25:32 2016
//
//  Draw texture 0 fetched at texcoord.xy, Blend with color uniform
//
//  Created by Sam Gateau on 7/12/2015
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//


uniform sampler2D colorMap;
uniform vec4 color;

in vec2 varTexCoord0;
out vec4 outFragColor;

void main(void) {
    outFragColor = texture(colorMap, varTexCoord0) * color;
}

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           #version 410 core
//  Generated on Wed Mar 02 02:26:36 2016
//  skybox.vert
//  vertex shader
//
//  Created by Sam Gateau on 5/5/2015.
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

struct TransformObject {
    mat4 _model;
    mat4 _modelInverse;
};

layout(location=15) in ivec2 _drawCallInfo;

uniform samplerBuffer transformObjectBuffer;

TransformObject getTransformObject() {
    int offset = 8 * _drawCallInfo.x;
    TransformObject object;
    object._model[0] = texelFetch(transformObjectBuffer, offset);
    object._model[1] = texelFetch(transformObjectBuffer, offset + 1);
    object._model[2] = texelFetch(transformObjectBuffer, offset + 2);
    object._model[3] = texelFetch(transformObjectBuffer, offset + 3);

    object._modelInverse[0] = texelFetch(transformObjectBuffer, offset + 4);
    object._modelInverse[1] = texelFetch(transformObjectBuffer, offset + 5);
    object._modelInverse[2] = texelFetch(transformObjectBuffer, offset + 6);
    object._modelInverse[3] = texelFetch(transformObjectBuffer, offset + 7);

    return object;
}

struct TransformCamera {
    mat4 _view;
    mat4 _viewInverse;
    mat4 _projectionViewUntranslated;
    mat4 _projection;
    mat4 _projectionInverse;
    vec4 _viewport;
};

layout(std140) uniform transformCameraBuffer {
    TransformCamera _camera;
};
TransformCamera getTransformCamera() {
    return _camera;
}



out vec3 _normal;

void main(void) {
    const float depth = 0.0;
    const vec4 UNIT_QUAD[4] = vec4[4](
        vec4(-1.0, -1.0, depth, 1.0),
        vec4(1.0, -1.0, depth, 1.0),
        vec4(-1.0, 1.0, depth, 1.0),
        vec4(1.0, 1.0, depth, 1.0)
    );
    vec4 inPosition = UNIT_QUAD[gl_VertexID];

    // standard transform
    TransformCamera cam = getTransformCamera();
    vec3 clipDir = vec3(inPosition.xy, 0.0);
    vec3 eyeDir;
    { // transformClipToEyeDir
        eyeDir = vec3(cam._projectionInverse * vec4(clipDir.xyz, 1.0)); // Must be 1.0 here
    }

    { // transformEyeToWorldDir
        _normal = vec3(cam._viewInverse * vec4(eyeDir.xyz, 0.0));
    }

    
    // Position is supposed to come in clip space
    gl_Position = vec4(inPosition.xy, 0.0, 1.0);
}
 #version 410 core
//  Generated on Wed Mar 02 02:26:36 2016
//  skybox.frag
//  fragment shader
//
//  Created by Sam Gateau on 5/5/2015.
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

uniform samplerCube cubeMap;

struct Skybox {
    vec4 _color;
};

uniform skyboxBuffer {
    Skybox _skybox;
};

in vec3  _normal;
out vec4 _fragColor;

//PROCEDURAL_COMMON_BLOCK

#line 1001
//PROCEDURAL_BLOCK

#line 2033
void main(void) {

#ifdef PROCEDURAL

    vec3 color = getSkyboxColor();
     // Procedural Shaders are expected to be Gamma corrected so let's bring back the RGB in linear space for the rest of the pipeline
     color = pow(color, vec3(2.2));
    _fragColor = vec4(color, 0.0);

#else 

    vec3 coord = normalize(_normal);
    vec3 texel = texture(cubeMap, coord).rgb;
    vec3 color = texel * _skybox._color.rgb;
    _fragColor = vec4(color, 0.0);

#endif

}

                    
   
               
   
    

 









  
   
   
   
   
             
                         
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float mod289(float x) {
    return x - floor(x * (1.0 / 289.0)) * 289.0; 
}

vec2 mod289(vec2 x) {
    return x - floor(x * (1.0 / 289.0)) * 289.0;
}

vec3 mod289(vec3 x) {
    return x - floor(x * (1.0 / 289.0)) * 289.0;
}

vec4 mod289(vec4 x) {
    return x - floor(x * (1.0 / 289.0)) * 289.0;
}

float permute(float x) {
    return mod289(((x*34.0)+1.0)*x);
}

vec3 permute(vec3 x) {
    return mod289(((x*34.0)+1.0)*x);
}

vec4 permute(vec4 x) {
    return mod289(((x*34.0)+1.0)*x);
}

float taylorInvSqrt(float r) {
    return 1.79284291400159 - 0.85373472095314 * r;
}

vec4 taylorInvSqrt(vec4 r) {
    return 1.79284291400159 - 0.85373472095314 * r;
}

vec4 grad4(float j, vec4 ip) {
    const vec4 ones = vec4(1.0, 1.0, 1.0, -1.0);
    vec4 p, s;

    p.xyz = floor(fract(vec3(j) * ip.xyz) * 7.0) * ip.z - 1.0;
    p.w = 1.5 - dot(abs(p.xyz), ones.xyz);
    s = vec4(lessThan(p, vec4(0.0)));
    p.xyz = p.xyz + (s.xyz * 2.0 - 1.0) * s.www;

    return p;
}

// (sqrt(5) - 1)/4 = F4, used once below
#define F4 0.309016994374947451

float snoise(vec4 v) {
    const vec4 C = vec4(0.138196601125011,  // (5 - sqrt(5))/20  G4
            0.276393202250021,  // 2 * G4
            0.414589803375032,  // 3 * G4
            -0.447213595499958); // -1 + 4 * G4

    // First corner
    vec4 i = floor(v + dot(v, vec4(F4)));
    vec4 x0 = v - i + dot(i, C.xxxx);

    // Other corners

    // Rank sorting originally contributed by Bill Licea-Kane, AMD (formerly ATI)
    vec4 i0;
    vec3 isX = step(x0.yzw, x0.xxx);
    vec3 isYZ = step(x0.zww, x0.yyz);
    i0.x = isX.x + isX.y + isX.z;
    i0.yzw = 1.0 - isX;
    i0.y += isYZ.x + isYZ.y;
    i0.zw += 1.0 - isYZ.xy;
    i0.z += isYZ.z;
    i0.w += 1.0 - isYZ.z;

    // i0 now contains the unique values 0,1,2,3 in each channel
    vec4 i3 = clamp(i0, 0.0, 1.0);
    vec4 i2 = clamp(i0 - 1.0, 0.0, 1.0);
    vec4 i1 = clamp(i0 - 2.0, 0.0, 1.0);

    vec4 x1 = x0 - i1 + C.xxxx;
    vec4 x2 = x0 - i2 + C.yyyy;
    vec4 x3 = x0 - i3 + C.zzzz;
    vec4 x4 = x0 + C.wwww;

    // Permutations
    i = mod289(i);
    float j0 = permute(permute(permute(permute(i.w) + i.z) + i.y) + i.x);
    vec4 j1 = permute(
            permute(
                    permute(
                            permute(i.w + vec4(i1.w, i2.w, i3.w, 1.0)) + i.z
                                    + vec4(i1.z, i2.z, i3.z, 1.0)) + i.y
                            + vec4(i1.y, i2.y, i3.y, 1.0)) + i.x
                    + vec4(i1.x, i2.x, i3.x, 1.0));

    // Gradients: 7x7x6 points over a cube, mapped onto a 4-cross polytope
    // 7*7*6 = 294, which is close to the ring size 17*17 = 289.
    vec4 ip = vec4(1.0 / 294.0, 1.0 / 49.0, 1.0 / 7.0, 0.0);

    vec4 p0 = grad4(j0, ip);
    vec4 p1 = grad4(j1.x, ip);
    vec4 p2 = grad4(j1.y, ip);
    vec4 p3 = grad4(j1.z, ip);
    vec4 p4 = grad4(j1.w, ip);

    // Normalise gradients
    vec4 norm = taylorInvSqrt(
            vec4(dot(p0, p0), dot(p1, p1), dot(p2, p2), dot(p3, p3)));
    p0 *= norm.x;
    p1 *= norm.y;
    p2 *= norm.z;
    p3 *= norm.w;
    p4 *= taylorInvSqrt(dot(p4, p4));

    // Mix contributions from the five corners
    vec3 m0 = max(0.6 - vec3(dot(x0, x0), dot(x1, x1), dot(x2, x2)), 0.0);
    vec2 m1 = max(0.6 - vec2(dot(x3, x3), dot(x4, x4)), 0.0);
    m0 = m0 * m0;
    m1 = m1 * m1;
    return 49.0
            * (dot(m0 * m0, vec3(dot(p0, x0), dot(p1, x1), dot(p2, x2)))
                    + dot(m1 * m1, vec2(dot(p3, x3), dot(p4, x4))));

}

float snoise(vec3 v) {
    const vec2 C = vec2(1.0 / 6.0, 1.0 / 3.0);
    const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);

    // First corner
    vec3 i = floor(v + dot(v, C.yyy));
    vec3 x0 = v - i + dot(i, C.xxx);

    // Other corners
    vec3 g = step(x0.yzx, x0.xyz);
    vec3 l = 1.0 - g;
    vec3 i1 = min(g.xyz, l.zxy);
    vec3 i2 = max(g.xyz, l.zxy);

    vec3 x1 = x0 - i1 + C.xxx;
    vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.y
    vec3 x3 = x0 - D.yyy;      // -1.0+3.0*C.x = -0.5 = -D.y

    // Permutations
    i = mod289(i);
    vec4 p = permute(
            permute(
                    permute(i.z + vec4(0.0, i1.z, i2.z, 1.0)) + i.y
                            + vec4(0.0, i1.y, i2.y, 1.0)) + i.x
                    + vec4(0.0, i1.x, i2.x, 1.0));

    // Gradients: 7x7 points over a square, mapped onto an octahedron.
    // The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294)
    float n_ = 0.142857142857; // 1.0/7.0
    vec3 ns = n_ * D.wyz - D.xzx;

    vec4 j = p - 49.0 * floor(p * ns.z * ns.z);  //  mod(p,7*7)

    vec4 x_ = floor(j * ns.z);
    vec4 y_ = floor(j - 7.0 * x_);    // mod(j,N)

    vec4 x = x_ * ns.x + ns.yyyy;
    vec4 y = y_ * ns.x + ns.yyyy;
    vec4 h = 1.0 - abs(x) - abs(y);

    vec4 b0 = vec4(x.xy, y.xy);
    vec4 b1 = vec4(x.zw, y.zw);

    //vec4 s0 = vec4(lessThan(b0,0.0))*2.0 - 1.0;
    //vec4 s1 = vec4(lessThan(b1,0.0))*2.0 - 1.0;
    vec4 s0 = floor(b0) * 2.0 + 1.0;
    vec4 s1 = floor(b1) * 2.0 + 1.0;
    vec4 sh = -step(h, vec4(0.0));

    vec4 a0 = b0.xzyw + s0.xzyw * sh.xxyy;
    vec4 a1 = b1.xzyw + s1.xzyw * sh.zzww;

    vec3 p0 = vec3(a0.xy, h.x);
    vec3 p1 = vec3(a0.zw, h.y);
    vec3 p2 = vec3(a1.xy, h.z);
    vec3 p3 = vec3(a1.zw, h.w);

    //Normalise gradients
    vec4 norm = taylorInvSqrt(
            vec4(dot(p0, p0), dot(p1, p1), dot(p2, p2), dot(p3, p3)));
    p0 *= norm.x;
    p1 *= norm.y;
    p2 *= norm.z;
    p3 *= norm.w;

    // Mix final noise value
    vec4 m = max(0.6 - vec4(dot(x0, x0), dot(x1, x1), dot(x2, x2), dot(x3, x3)),
            0.0);
    m = m * m;
    return 42.0
            * dot(m * m, vec4(dot(p0, x0), dot(p1, x1), dot(p2, x2), dot(p3, x3)));
}

float snoise(vec2 v) {
    const vec4 C = vec4(0.211324865405187,  // (3.0-sqrt(3.0))/6.0
            0.366025403784439,  // 0.5*(sqrt(3.0)-1.0)
            -0.577350269189626,  // -1.0 + 2.0 * C.x
            0.024390243902439); // 1.0 / 41.0
    // First corner
    vec2 i = floor(v + dot(v, C.yy));
    vec2 x0 = v - i + dot(i, C.xx);

    // Other corners
    vec2 i1;
    i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
    vec4 x12 = x0.xyxy + C.xxzz;
    x12.xy -= i1;

    // Permutations
    i = mod289(i); // Avoid truncation effects in permutation
    vec3 p = permute(
            permute(i.y + vec3(0.0, i1.y, 1.0)) + i.x + vec3(0.0, i1.x, 1.0));

    vec3 m = max(0.5 - vec3(dot(x0, x0), dot(x12.xy, x12.xy), dot(x12.zw, x12.zw)),
            0.0);
    m = m * m;
    m = m * m;

    // Gradients: 41 points uniformly over a line, mapped onto a diamond.
    // The ring size 17*17 = 289 is close to a multiple of 41 (41*7 = 287)

    vec3 x = 2.0 * fract(p * C.www) - 1.0;
    vec3 h = abs(x) - 0.5;
    vec3 ox = floor(x + 0.5);
    vec3 a0 = x - ox;

    // Normalise gradients implicitly by scaling m
    // Approximation of: m *= inversesqrt( a0*a0 + h*h );
    m *= 1.79284291400159 - 0.85373472095314 * (a0 * a0 + h * h);

    // Compute final noise value at P
    vec3 g;
    g.x = a0.x * x0.x + h.x * x0.y;
    g.yz = a0.yz * x12.xz + h.yz * x12.yw;
    return 130.0 * dot(m, g);
}

// shader playback time (in seconds)
uniform float iGlobalTime;
// the dimensions of the object being rendered
uniform vec3 iWorldScale;            

#define PROCEDURAL 1

//PROCEDURAL_VERSION

#ifdef PROCEDURAL_V1

#else

// Unimplemented uniforms
// Resolution doesn't make sense in the VR context
const vec3 iResolution = vec3(1.0);
// Mouse functions not enabled currently
const vec4 iMouse = vec4(0.0);
// No support for audio input
const float iSampleRate = 1.0;
// No support for video input
const vec4 iChannelTime = vec4(0.0);


uniform vec4 iDate;
uniform int iFrameCount;
uniform vec3 iWorldPosition;
uniform vec3 iChannelResolution[4];
uniform sampler2D iChannel0;
uniform sampler2D iChannel1;
uniform sampler2D iChannel2;
uniform sampler2D iChannel3;

#endif

   ProceduralEntity        shaderUrl       uniforms        channels        //PROCEDURAL_BLOCK      //PROCEDURAL_COMMON_BLOCK       //PROCEDURAL_VERSION    iDate   iFrameCount     iWorldScale     iWorldPosition  iChannelResolution      Invalid shader URL:     Shader path:    Shader url:     #define PROCEDURAL_V1 1 #define PROCEDURAL_V2 1 iChannel0       iChannel1       iChannel2       iChannel3