bgfx/examples/24-nbody/fs_particle.sc

$input v_texCoord

/*
 * Copyright 2014 Stanlo Slasinski. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
 */

#include "../common/common.sh"
#include "uniforms.sh"

void main()
{
	vec3 color = mix(vec3(0.1f, 0.8f, 0.2f), 0.5 *  vec3(0.3, 0.25, 0.05), v_texCoord.z);
	float f = u_particleIntensity * pow(max(1.0 - length(v_texCoord.xy), 0.0), u_particlePower);
	gl_FragColor = vec4(color * f, 1.0);
}