/*
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;

void main (void)
{
	vec2 c = 2.0 * (gtf_Color.rg - 0.5);
	if(c[0] > 0.0) c[0] = 1.0 * c[0];
	if(c[0] < 0.0) c[0] = -1.0 * c[0];
	if(c[1] > 0.0) c[1] = 1.0 * c[1];
	if(c[1] < 0.0) c[1] = -1.0 * c[1];

	color = vec4(c, 0.0, 1.0);
	gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}