js/SceneKit/_SCNDefaultShadowFragmentShader.js
'use strict'
/**
* @access private
* @type {string}
*/
const _SCNDefaultShadowFragmentShader =
`#version 300 es
precision mediump float;
in vec3 v_position;
layout(location = 0) out vec4 out_depth;
//layout(location = 0) out float out_depth;
void main() {
float r = (v_position.z + 1.0) * 0.5;
float g = fract(r * 255.0);
float b = fract(g * 255.0);
float a = fract(b * 255.0);
float coef = 1.0 / 255.0;
r -= g * coef;
g -= b * coef;
b -= a * coef;
out_depth = vec4(r, g, b, a);
//out_depth = v_position.z;
}
`
export default _SCNDefaultShadowFragmentShader