1 2/* 3Copyright (c) 2019 The Khronos Group Inc. 4Use of this source code is governed by an MIT-style license that can be 5found in the LICENSE.txt file. 6*/ 7 8 9attribute vec4 gtf_Vertex; 10attribute vec4 gtf_Color; 11uniform mat4 gtf_ModelViewProjectionMatrix; 12varying vec4 color; 13 14void main (void) 15{ 16 const float M_PI = 3.14159265358979323846; 17 vec2 c = 4.0 * 2.0 * (gtf_Color.rg - 0.5); 18 color = vec4(atan(c) / M_PI + 0.5, 0.0, 1.0); 19 gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; 20} 21