root/OpenSceneGraph-Data/tags/OpenSceneGraph-Data-2.4.0/glsl_julia.osg

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  StateSet {
    DataVariance STATIC
    rendering_hint DEFAULT_BIN
    renderBinMode INHERIT
    Uniform {
      DataVariance DYNAMIC
      name "Cimag"
      float 0.11
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    Uniform {
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      name "Creal"
      float -0.765
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    Uniform {
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      name "DiffuseContribution"
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    Uniform {
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    Uniform {
      DataVariance DYNAMIC
      name "LightPosition"
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    Uniform {
      DataVariance DYNAMIC
      name "MaxIterations"
      float 100
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    Uniform {
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      name "OuterColor1"
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    Uniform {
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      name "OuterColor2"
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    Uniform {
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    Uniform {
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    Uniform {
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      name "Xcenter"
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    Uniform {
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      name "Ycenter"
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    Uniform {
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      name "Zoom"
      float 0.7
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    Program {
      DataVariance STATIC
      num_shaders 2
      Shader {
        DataVariance DYNAMIC
        type VERTEX
        code {
          "//
"
          "// Vertex shader for drawing Julia sets
"
          "//
"
          "// Authors: Dave Baldwin, Steve Koren, Randi Rost
"
          "//          based on a shader by Michael Rivero
"
          "//
"
          "// Copyright (c) 2002-2004: 3Dlabs, Inc.
"
          "//
"
          "// See 3Dlabs-License.txt for license information
"
          "//
"
          "
"
          "uniform vec3 LightPosition;
"
          "uniform float SpecularContribution;
"
          "uniform float DiffuseContribution;
"
          "uniform float Shininess;
"
          "
"
          "varying float LightIntensity;
"
          "varying vec3  Position;
"
          "
"
          "void main(void)
"
          "{
"
          "    vec3 ecPosition = vec3 (gl_ModelViewMatrix * gl_Vertex);
"
          "    vec3 tnorm      = normalize(gl_NormalMatrix * gl_Normal);
"
          "    vec3 lightVec   = normalize(LightPosition - ecPosition);
"
          "    vec3 reflectVec = reflect(-lightVec, tnorm);
"
          "    vec3 viewVec    = normalize(-ecPosition);
"
          "    float spec      = max(dot(reflectVec, viewVec), 0.0);
"
          "    spec            = pow(spec, Shininess);
"
          "    LightIntensity  = DiffuseContribution * 
"
          "                          max(dot(lightVec, tnorm), 0.0) +
"
          "                          SpecularContribution * spec;
"
          "    Position        = vec3(gl_MultiTexCoord0 - 0.5) * 5.0;
"
          "    gl_Position     = ftransform();
"
          "
"
          "}"
        }
      }
      Shader {
        DataVariance DYNAMIC
        type FRAGMENT
        code {
          "//
"
          "// Fragment shader for drawing Julia sets
"
          "//
"
          "// Authors: Dave Baldwin, Steve Koren, Randi Rost
"
          "//          based on a shader by Michael Rivero
"
          "//
"
          "// Copyright (c) 2002-2004: 3Dlabs, Inc.
"
          "//
"
          "// See 3Dlabs-License.txt for license information
"
          "//
"
          "
"
          "varying vec3  Position;
"
          "varying float LightIntensity;
"
          "
"
          "uniform float MaxIterations;
"
          "uniform float Zoom;
"
          "uniform float Xcenter;
"
          "uniform float Ycenter;
"
          "uniform vec3  InnerColor;
"
          "uniform vec3  OuterColor1;
"
          "uniform vec3  OuterColor2;
"
          "uniform float Creal;
"
          "uniform float Cimag;
"
          "
"
          "void main(void)
"
          "{
"
          "    float   real  = Position.x * Zoom + Xcenter;
"
          "    float   imag  = Position.y * Zoom + Ycenter;
"
          "    //float   Creal = real;   // Change this line...
"
          "    //float   Cimag = imag;   // ...and this one to get a Julia set
"
          "
"
          "    float r2 = 0.0;
"
          "    float iter;
"
          "
"
          "    for (iter = 0.0; iter < MaxIterations && r2 < 4.0; ++iter)
"
          "    {
"
          "        float tempreal = real;
"
          "
"
          "        real = (tempreal * tempreal) - (imag * imag) + Creal;
"
          "        imag = 2.0 * tempreal * imag + Cimag;
"
          "        r2   = (real * real) + (imag * imag);
"
          "    }
"
          "
"
          "    // Base the color on the number of iterations
"
          "
"
          "    vec3 color;
"
          "
"
          "    if (r2 < 4.0)
"
          "        color = InnerColor;
"
          "    else
"
          "        color = mix(OuterColor1, OuterColor2, fract(iter * 0.05));
"
          "
"
          "    color *= LightIntensity;
"
          "
"
          "    gl_FragColor = vec4 (color, 1.0);
"
          "}"
        }
      }
    }
  }
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