glsl-fog  #

Basic fog functions for GLSL, generic but intended for use with
glslify.

Usage ##


Here's a hypothetical example of linear fog calculated in a vertex shader:

`` glsl
#define FOG_START 100
#define FOG_END 500

varying float fogAmount;
uniform vec3 position;

#pragma glslify: fog_linear = require(glsl-fog/linear)

void main() {
gl_Position = projection view model * vec4(positon, 1.0);
float fogDistance = length(gl_Position.xyz);
fogAmount = fog_linear(fogDistance, FOG_START, FOG_END);
}
`

And another (separate) example using exp/exp2 per-pixel fog:

` glsl
#define FOG_DENSITY 0.05

varying vec4 vertexColor;

// Take your pick: these should be usable interchangeably.
#pragma glslify: fog_exp2 = require(glsl-fog/exp2)
#pragma glslify: fog_exp = require(glsl-fog/exp)

void main() {
float fogDistance = gl_FragCoord.z / gl_FragCoord.w;
float fogAmount = fog_exp2(fogDistance, FOG_DENSITY);
const float fogColor = vec4(1.0); // white

gl_FragColor = mix(vertexColor, fogColor, fogAmount);
}
``

License ##

MIT. See LICENSE.md for details.