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/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/
attribute vec4 gtf_Color;
attribute vec4 gtf_Vertex;
uniform mat4 gtf_ModelViewProjectionMatrix;
varying vec4 color;
float lerp(float a, float b, float s)
{
return a + (b - a) * s;
}
void main (void)
{
float sinValues[17];
sinValues[0] = 0.0;
sinValues[1] = 0.382683;
sinValues[2] = 0.707107;
sinValues[3] = 0.92388;
sinValues[4] = 1.0;
sinValues[5] = 0.92388;
sinValues[6] = 0.707107;
sinValues[7] = 0.382683;
sinValues[8] = 0.0;
sinValues[9] = -0.382683;
sinValues[10] = -0.707107;
sinValues[11] = -0.92388;
sinValues[12] = -1.0;
sinValues[13] = -0.923879;
sinValues[14] = -0.707107;
sinValues[15] = -0.382683;
sinValues[16] = 0.0;
const float M_PI = 3.14159265358979323846;
vec3 c = 2.0 * M_PI * gtf_Color.rgb;
float sign = 1.0;
vec3 sin_c = vec3(0.0);
float fact;
float fact_of;
// Taylors series expansion for sin
for(int i = 0; i < 12; i++)
{
fact = 1.0;
for(int j = 2; j <= 23; j++)
if (j <= 2 * i + 1)
fact *= float(j);
sin_c += sign * pow(c, vec3(2.0 * float(i) + 1.0)) / fact;
sign *= -1.0;
}
color = vec4(0.5 * sin_c + 0.5, 1.0);
gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}
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