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going-digital/fast_trig.frag

Created December 17, 2012 17:21
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Revisions

  1. going-digital revised this gist Dec 17, 2012. 1 changed file with 3 additions and 0 deletions.
    3 changes: 3 additions & 0 deletions fast_trig.frag
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    Original file line number Diff line number Diff line change
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    // Language is OpenGL ES, but gist.github.com doesn't know that language
    //
    // Approximation is based on multiply/accumulate, because thats the only
    // thing Videocore can do quickly!

    precision highp float;

  2. going-digital created this gist Dec 17, 2012.
    53 changes: 53 additions & 0 deletions fast_trig.frag
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    // Language is OpenGL ES, but gist.github.com doesn't know that language

    precision highp float;

    float sinf(float x)
    {
    x*=0.159155;
    x-=floor(x);
    float xx=x*x;
    float y=-6.87897;
    y=y*xx+33.7755;
    y=y*xx-72.5257;
    y=y*xx+80.5874;
    y=y*xx-41.2408;
    y=y*xx+6.28077;
    return x*y;
    }
    float cosf(float x)
    {
    return sinf(x+1.5708);
    }
    vec3 z()
    {
    return vec3(0.);
    }
    //
    // There is no speed advantage in vectorising the following.
    // Maybe the compiler figures out the vectorisation itself?
    //
    vec2 sinf(vec2 x)
    {
    return vec2(sinf(x.x),sinf(x.y));
    }
    vec2 cosf(vec2 x)
    {
    return vec2(cosf(x.x),cosf(x.y));
    }
    vec3 sinf(vec3 x)
    {
    return vec3(sinf(x.x),sinf(x.y),sinf(x.z));
    }
    vec3 cosf(vec3 x)
    {
    return vec3(cosf(x.x),cosf(x.y),cosf(x.z));
    }
    vec4 sinf(vec4 x)
    {
    return vec4(sinf(x.x),sinf(x.y),sinf(x.z),sinf(x.w));
    }
    vec4 cosf(vec4 x)
    {
    return vec4(cosf(x.x),cosf(x.y),cosf(x.z),cosf(x.w));
    }