bgfx/examples/02-metaballs/fs_metaballs.sc

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$input v_normal, v_color0
/*
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* Copyright 2011-2013 Branimir Karadzic. All rights reserved.
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* License: http://www.opensource.org/licenses/BSD-2-Clause
*/
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#include "../common/common.sh"
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void main()
{
vec3 lightDir = vec3(0.0, 0.0, -1.0);
float ndotl = max(dot(normalize(v_normal), lightDir), 0.0);
float spec = pow(ndotl, 30.0);
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gl_FragColor = pow(pow(v_color0, vec4_splat(2.2) ) * ndotl + spec, vec4_splat(1.0/2.2) );
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}