Mindustry/core/assets/bloomshaders/bloom.frag

#ifdef GL_ES
#define LOWP lowp
#define MED mediump
precision lowp float;
#else
#define LOWP  
#define MED 
#endif
uniform sampler2D u_texture0;
uniform sampler2D u_texture1;
uniform float BloomIntensity;
uniform float OriginalIntensity;

varying MED vec2 v_texCoords;

void main(){
    vec4 original = texture2D(u_texture0, v_texCoords) * OriginalIntensity;
    vec4 bloom = texture2D(u_texture1, v_texCoords) * BloomIntensity;
    original = original *  (vec4(1.0) - bloom);
    gl_FragColor =  original + bloom;
}