From c00bb458f40dd8ab015a1b738c1c71e7f4893ed2 Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Sat, 17 Feb 2024 09:56:03 +0100
Subject: Support runtime speed scaling

---
 src/ahoy/config.h |  6 ++++--
 src/ahoy/gui.c    | 14 +++++++++++---
 src/ahoy/main.c   |  8 ++------
 3 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/src/ahoy/config.h b/src/ahoy/config.h
index 23d756f..4361d7d 100644
--- a/src/ahoy/config.h
+++ b/src/ahoy/config.h
@@ -3,14 +3,16 @@
 
 #include <stdint.h>
 
-#define VOLMAX 10'000
+#define FPS      60
+#define CPUHZMAX 10'000
+#define VOLMAX   10'000
 
 struct config {
 	bool scanls;
 	bool seeded;
 	uint16_t seed;
-	unsigned cpu_hz;
 	int vol;
+	int cpu_hz;
 };
 
 extern struct config cfg;
diff --git a/src/ahoy/gui.c b/src/ahoy/gui.c
index 5ec20f3..cd01bcb 100644
--- a/src/ahoy/gui.c
+++ b/src/ahoy/gui.c
@@ -143,18 +143,26 @@ readevnt(void)
 			case SDLK_SPACE:
 				estate = estate == ES_RUNNING ? ES_PAUSED : ES_RUNNING;
 				break;
+			case SDLK_l:
+				cfg.scanls = !cfg.scanls;
+				windrw();
+				break;
 			case SDLK_p:
 				estate = ES_RESET;
 				break;
+
 			case SDLK_EQUALS:
 				cfg.vol = MIN(cfg.vol + 500, VOLMAX);
 				break;
 			case SDLK_MINUS:
 				cfg.vol = MAX(cfg.vol - 500, 0);
 				break;
-			case SDLK_l:
-				cfg.scanls = !cfg.scanls;
-				windrw();
+
+			case SDLK_PERIOD:
+				cfg.cpu_hz = MIN(cfg.cpu_hz + 10, CPUHZMAX);
+				break;
+			case SDLK_COMMA:
+				cfg.cpu_hz = MAX(cfg.cpu_hz - 10, FPS);
 				break;
 
 			case SDLK_1:
diff --git a/src/ahoy/main.c b/src/ahoy/main.c
index 85db49e..f1feef5 100644
--- a/src/ahoy/main.c
+++ b/src/ahoy/main.c
@@ -33,8 +33,6 @@
 #	warning "ckd_*() not supported on the current platform"
 #endif
 
-#define FPS 60
-
 #define STRTOX(T, SUF) \
 	static T strto##SUF(const char8_t *s, rune *ch) \
 	{ \
@@ -51,7 +49,6 @@
 	}
 
 STRTOX(int, i)
-STRTOX(unsigned, u)
 STRTOX(uint16_t, u16)
 
 [[noreturn]] static void usage(void);
@@ -115,8 +112,7 @@ main(int argc, char **argv)
 			execlp("man", "man", "1", argv[0], nullptr);
 			die("execlp: man 1 %s", argv[0]);
 		case 'c':
-			NUMERIC_ARG(unsigned, UINT_MAX, "u", strtou, cpu_hz,
-			            "cpu clock speed");
+			NUMERIC_ARG(int, CPUHZMAX, "d", strtoi, cpu_hz, "cpu clock speed");
 			if (cfg.cpu_hz < FPS) {
 				warnx("cpu clock speed may not be lower than the framerate (%d "
 				      "FPS)",
@@ -211,7 +207,7 @@ reset:
 		}
 
 		st = SDL_GetPerformanceCounter();
-		for (unsigned i = 0; i < cfg.cpu_hz / FPS; i++)
+		for (int i = 0; i < cfg.cpu_hz / FPS; i++)
 			emutick();
 		et = SDL_GetPerformanceCounter();
 		dt = (double)((et - st) * 1000) / SDL_GetPerformanceFrequency();
-- 
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