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This gives a very noisy version of the real audio.

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This commit is contained in:
Thomas Harte 2017-03-20 20:38:29 -04:00
parent f3f4e1a541
commit 4c3cc42c91
1 changed files with 5 additions and 5 deletions
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10
Machines/Atari2600/Cartridges/CartridgePitfall2.hpp
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@ -47,7 +47,6 @@ class CartridgePitfall2: public Cartridge<CartridgePitfall2> {
case 0x1005: case 0x1006: case 0x1007:
*value = update_audio();
printf("%01x ", *value);
break;
case 0x1008: case 0x1009: case 0x100a: case 0x100b: case 0x100c: case 0x100d: case 0x100e: case 0x100f:
@ -102,13 +101,14 @@ class CartridgePitfall2: public Cartridge<CartridgePitfall2> {
}
inline uint8_t update_audio() {
unsigned int cycles_to_run_for = cycles_since_audio_update_ / 57;
cycles_since_audio_update_ %= 57;
const unsigned int clock_divisor = 57;
unsigned int cycles_to_run_for = cycles_since_audio_update_ / clock_divisor;
cycles_since_audio_update_ %= clock_divisor;
int table_position = 0;
for(int c = 0; c < 3; c++) {
audio_channel_[c] = (audio_channel_[c] + cycles_to_run_for) % (top_[5 + c] ^ 0xff);
if((featcher_address_[5 + c] & 0x1000) && ((audio_channel_[c] ^ 0xff) > bottom_[5 + c])) {
audio_channel_[c] = (audio_channel_[c] + cycles_to_run_for) % (1 + top_[5 + c]);
if((featcher_address_[5 + c] & 0x1000) && ((top_[5 + c] - audio_channel_[c]) > bottom_[5 + c])) {
table_position |= 0x4 >> c;
}
}