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23 lines
539 B
C
23 lines
539 B
C
unsigned short rng;
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short sky_colour = 0xEEEF;
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unsigned short rng_function(unsigned short input){
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if(input == 0x560A) input=0;
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unsigned short S0 = (unsigned char)input<<8;
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S0 = S0 ^ input;
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input = ((S0 & 0xFF) << 8) | ((S0 & 0xFF00) >> 8);
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S0 = ((unsigned char)S0 << 1) ^ input;
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short S1 = (S0 >> 1) ^ 0xFF80;
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if((S0 & 1) == 0){
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if(S1 == 0xAA55){input = 0;}else{input=S1 ^ 0x1FF4;}
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}else{
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input = S1 ^ 0x1FF4;
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}
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return (unsigned short)input;
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}
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void rng_update() {
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rng = rng_function(GlobalTimer);
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}
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