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gb: pause function

--- a/sys/src/games/gb/audio.c

+++ b/sys/src/games/gb/audio.c

@@ -7,6 +7,7 @@

 static int fd;

 static int sc, ch1c, ch2c, ch3c, ch4c, ch4sr = 1, ch1vec, ch2vec, ch4vec, ch1v, ch2v, ch4v;

+extern int paused;

 enum { SAMPLE = 44100 };

@@ -201,8 +202,11 @@

 	int i;

 	for(;;){

-		for(i = 0; i < sizeof samples/4; i++)

-			dosample(samples + 2 * i);

+		if(paused)

+			memset(samples, 0, sizeof samples);

+		else

+			for(i = 0; i < sizeof samples/4; i++)

+				dosample(samples + 2 * i);

 		write(fd, samples, sizeof samples);

 	}

 }

--- a/sys/src/games/gb/gb.c

+++ b/sys/src/games/gb/gb.c

@@ -9,10 +9,11 @@

 #include "fns.h"

 uchar *cart, *ram;

-int mbc, rombanks, rambanks, clock, ppuclock, divclock, timerclock, syncclock, syncfreq, sleeps, checkclock, msgclock, timerfreq, timer, keys, savefd, savereq, loadreq, scale;

+int mbc, rombanks, rambanks, clock, ppuclock, divclock, timerclock, syncclock, syncfreq, sleeps, checkclock, msgclock, timerfreq, timer, keys, savefd, savereq, loadreq, scale, paused;

 Rectangle picr;

 Image *bg, *tmp;

 Mousectl *mc;

+QLock pauselock;

 void

 message(char *fmt, ...)

@@ -177,7 +178,7 @@

 		if(read(fd, buf, 256) <= 0)

 			sysfatal("read /dev/kbd: %r");

 		if(buf[0] == 'c'){

-			if(strchr(buf, Kesc))

+			if(utfrune(buf, KF|12) || utfrune(buf, 'o'))

 				threadexitsall(nil);

 			if(utfrune(buf, KF|5))

 				savereq = 1;

@@ -192,6 +193,13 @@

 			s += chartorune(&r, s);

 			switch(r){

 			case Kesc:

+				if(paused)

+					qunlock(&pauselock);

+				else

+					qlock(&pauselock);

+				paused = !paused;

+				break;

+			case KF|12:

 				threadexitsall(nil);

 			case Kdown:

 				keys |= 1<<3;

@@ -269,6 +277,10 @@

 		if(loadreq){

 			loadstate("gb.save");

 			loadreq = 0;

+		}

+		if(paused){

+			qlock(&pauselock);

+			qunlock(&pauselock);

 		}

 		t = step();

 		clock += t;

-- 

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