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Better camera noise on frontends without camera support

This commit is contained in:
Lior Halphon 2021-01-03 16:52:18 +02:00
parent f9b13c66b1
commit 29a3b18186
1 changed files with 13 additions and 13 deletions
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26
Core/camera.c
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@ -1,26 +1,26 @@
#include "gb.h" #include "gb.h"
static signed noise_seed = 0; static uint32_t noise_seed = 0;
/* This is not a complete emulation of the camera chip. Only the features used by the GameBoy Camera ROMs are supported. /* This is not a complete emulation of the camera chip. Only the features used by the Game Boy Camera ROMs are supported.
We also do not emulate the timing of the real cart, as it might be actually faster than the webcam. */ We also do not emulate the timing of the real cart, as it might be actually faster than the webcam. */
static uint8_t generate_noise(uint8_t x, uint8_t y) static uint8_t generate_noise(uint8_t x, uint8_t y)
{ {
signed value = (x + y * 128 + noise_seed); uint32_t value = (x * 151 + y * 149) ^ noise_seed;
uint8_t *data = (uint8_t *) &value; uint32_t hash = 0;
unsigned hash = 0;
while ((signed *) data != &value + 1) { while (value) {
hash ^= (*data << 8);
if (hash & 0x8000) {
hash ^= 0x8a00;
hash ^= *data;
}
data++;
hash <<= 1; hash <<= 1;
if (hash & 0x100) {
hash ^= 0x101;
}
if (value & 0x80000000) {
hash ^= 0xA1;
}
value <<= 1;
} }
return (hash >> 8); return hash;
} }
static long get_processed_color(GB_gameboy_t *gb, uint8_t x, uint8_t y) static long get_processed_color(GB_gameboy_t *gb, uint8_t x, uint8_t y)