From 20fe0f35b58cd0be20102b82c4f3fff883911017 Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Fri, 16 Feb 2024 22:40:21 +0100
Subject: Improve reset code

---
 src/ahoy/emulator.c | 11 +++--------
 src/ahoy/emulator.h |  1 -
 src/ahoy/gui.c      |  8 ++++----
 src/ahoy/gui.h      | 11 ++++++-----
 src/ahoy/main.c     | 11 +++++++++--
 5 files changed, 22 insertions(+), 20 deletions(-)

diff --git a/src/ahoy/emulator.c b/src/ahoy/emulator.c
index 3b6544b..79ff4dc 100644
--- a/src/ahoy/emulator.c
+++ b/src/ahoy/emulator.c
@@ -43,20 +43,15 @@ static uint8_t mem[MEM_TOTAL] = {
 void
 emuinit(struct u8view prog, const char *fn)
 {
+	struct timespec tp;
+
 	filename = fn;
 	if (prog.len > MEM_FREE) {
 		diex("%s: binary of size %.1f KiB exceeds %d B maximum", filename,
 		     (double)prog.len / 1024, MEM_FREE);
 	}
-	memcpy(mem + MEM_RESERVED, prog.p, prog.len);
-	emureset();
-}
-
-void
-emureset(void)
-{
-	struct timespec tp;
 
+	memcpy(mem + MEM_RESERVED, prog.p, prog.len);
 	memset(&c8, 0, sizeof(c8));
 	c8.PC = MEM_RESERVED;
 
diff --git a/src/ahoy/emulator.h b/src/ahoy/emulator.h
index 33618da..24aa8ce 100644
--- a/src/ahoy/emulator.h
+++ b/src/ahoy/emulator.h
@@ -26,7 +26,6 @@ struct chip8 {
 
 void emuinit(struct u8view, const char *);
 void emutick(void);
-void emureset(void);
 
 extern struct chip8 c8;
 
diff --git a/src/ahoy/gui.c b/src/ahoy/gui.c
index 083d4e2..0997bf9 100644
--- a/src/ahoy/gui.c
+++ b/src/ahoy/gui.c
@@ -17,7 +17,7 @@
 
 static void audio_callback(void *, uint8_t *, int);
 
-guistate gs;
+emustate estate = ES_RUNNING;
 static SDL_Window *win;
 static SDL_Renderer *rndr;
 static SDL_AudioDeviceID adev;
@@ -119,17 +119,17 @@ readkb(void)
 	while (SDL_PollEvent(&e)) {
 		switch (e.type) {
 		case SDL_QUIT:
-			gs = GUI_STOP;
+			estate = ES_STOP;
 			break;
 
 		case SDL_KEYDOWN:
 			switch (e.key.keysym.sym) {
 			case SDLK_SPACE:
-				gs = gs == GUI_RUNNING ? GUI_PAUSED : GUI_RUNNING;
+				estate = estate == ES_RUNNING ? ES_PAUSED : ES_RUNNING;
 				break;
 
 			case SDLK_EQUALS:
-				emureset();
+				estate = ES_RESET;
 				break;
 
 			// case SDLK_j:
diff --git a/src/ahoy/gui.h b/src/ahoy/gui.h
index d3953b5..0760437 100644
--- a/src/ahoy/gui.h
+++ b/src/ahoy/gui.h
@@ -5,10 +5,11 @@
 #include <stdint.h>
 
 typedef enum {
-	GUI_RUNNING,
-	GUI_PAUSED,
-	GUI_STOP,
-} guistate;
+	ES_PAUSED,
+	ES_RESET,
+	ES_RUNNING,
+	ES_STOP,
+} emustate;
 
 void wininit(void);
 void winfree(void);
@@ -16,6 +17,6 @@ void windrw(void);
 void auplay(bool);
 void readkb(void);
 
-extern guistate gs;
+extern emustate estate;
 
 #endif /* !AHOY_AHOY_GUI_H */
diff --git a/src/ahoy/main.c b/src/ahoy/main.c
index 857185b..b107fa2 100644
--- a/src/ahoy/main.c
+++ b/src/ahoy/main.c
@@ -176,15 +176,22 @@ run(int fd, const char *fn)
 
 	free(buf);
 	wininit();
+reset:
 	emuinit(u8strtou8(sb), fn);
+	windrw();
+	auplay(true);
 
-	while (gs != GUI_STOP) {
+	while (estate != ES_STOP) {
 		double dt;
 		uint64_t st, et;
 
 		readkb();
-		if (gs == GUI_PAUSED)
+		if (estate == ES_PAUSED)
 			continue;
+		if (estate == ES_RESET) {
+			estate = ES_RUNNING;
+			goto reset;
+		}
 
 		st = SDL_GetPerformanceCounter();
 		for (unsigned i = 0; i < cfg.cpu_hz / FPS; i++)
-- 
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