stk-code_catmod/data/shaders/bloom.frag

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#version 130
uniform sampler2D tex;
uniform float low;
in vec2 uv;
void main()
{
vec3 weights = vec3(0.2126, 0.7152, 0.0722); // ITU-R BT. 709
vec3 col = texture(tex, uv).xyz;
float luma = dot(weights, col);
col *= smoothstep(low, 0.9, luma);
gl_FragColor = vec4(col, 1.0);
}