first pass at sounds

1 files changed, 97 insertions, 0 deletions

diff --git a/sounds.c b/sounds.c
new file mode 100644
index 0000000..aee7319
--- /dev/null
+++ b/sounds.c
@@ -0,0 +1,97 @@
+/* Sounds for Taipan! Atari 800 port.
+
+	Made by capturing the Apple II audio and taking wild guesses,
+	then refining them.
+
+	I'm not shooting for Atari sounds that are identical to the
+	Apple ones: (a) it's impossible anyway, and (b) the Apple
+	sounds are a bit harsh to the ear. Hopefully these sound
+	a little smoother while still being pretty close.
+*/
+
+#include <atari.h>
+#include <peekpoke.h>
+
+/* to build standalone xex that just plays the 3 sounds:
+	cl65 -DTESTXEX -t atari -o sounds.xex sounds.c 
+*/
+#ifdef TESTXEX
+#include <stdio.h>
+
+void jsleep(unsigned int j) {
+	POKE(20,0);
+	while(PEEK(20) < j)
+		;
+}
+#else
+extern void __fastcall__ jsleep(unsigned int j);
+#endif
+
+void init_sound(void) {
+	/* init POKEY audio */
+	POKEY_WRITE.audctl = 0;
+	POKEY_WRITE.skctl = 3;
+	POKEY_WRITE.audc1 = 0xaa; /* SOUND 0,x,10,10 */
+}
+
+void stop_sound(void) {
+	POKEY_WRITE.audc1 = 0x00; /* SOUND 0,x,0,0 */
+}
+
+void bad_joss_sound() {
+	unsigned char i;
+
+	init_sound();
+	for(i=0; i<10; i++) {
+		POKEY_WRITE.audf1 = 80-i*8;
+		jsleep(1);
+	}
+	stop_sound();
+}
+
+void good_joss_sound() {
+	unsigned char i, j;
+
+	init_sound();
+	for(j=0; j<3; j++) {
+		for(i=0; i<4; i++) {
+			POKEY_WRITE.audf1 = 20-i*5;
+			jsleep(2);
+		}
+	}
+	stop_sound();
+}
+
+void under_attack_sound() {
+	unsigned char i, j;
+
+	init_sound();
+	for(j=0; j<3; j++) {
+		for(i=0; i<3; i++) {
+			POKEY_WRITE.audf1 = 20-i*3;
+			jsleep(3);
+		}
+	}
+	stop_sound();
+}
+
+#ifdef TESTXEX
+int main(void) {
+	for(;;) {
+		puts("Bad joss, Taipan!");
+		bad_joss_sound();
+		jsleep(30);
+
+		puts("Good joss, Taipan!");
+		good_joss_sound();
+		jsleep(30);
+
+		puts("1.0E+97 hostile ships approaching, Taipan!");
+		under_attack_sound();
+		jsleep(30);
+	}
+
+hang: goto hang;
+	return 0;
+}
+#endif