[Maintenance] [th04/th05] Bullets: Move clear/zap declarations to new header

Part of P0188, funded by [Anonymous] and nrook.

th04/bullet_a.cpp

@@ -15,6 +15,7 @@ extern "C" {
 #include "th04/main/playperf.hpp"
 #include "th04/main/player/player.hpp"
 #include "th04/main/bullet/bullet.hpp"
+#include "th04/main/bullet/clearzap.hpp"
 #include "th04/main/gather.hpp"
 
 #pragma option -a2

th04/main/bullet/bullet.hpp

@@ -200,23 +200,6 @@ extern union {
 	SubpixelLength8 speed_delta;
 } bullet_special_motion;
 
-// Set to `true` to clear all on-screen bullets, giving out a semi-exponential
-// bonus for all bullets that were alive on the first frame of activity.
-// Lasts for BULLET_ZAP_FRAMES and resets to `false` afterwards.
-extern union {
-	bool active;
-	unsigned char frames; // doubles as the animation timer
-} bullet_zap;
-static const int BULLET_ZAP_FRAMES_PER_CEL = 4;
-// ZUN bug: Effectively 1 in TH05, see bullets_update() for the cause.
-static const int BULLET_ZAP_FRAMES = (
-	BULLET_ZAP_CELS * BULLET_ZAP_FRAMES_PER_CEL
-);
-
-// # of frames left during which all on-screen bullets should decay.
-// Gives a constant point bonus for every bullet decayed during that time.
-extern unsigned char bullet_clear_time;
-
 /// Rendering
 /// ---------
 union pellet_render_t {

th04/main/bullet/clearzap.hpp

@@ -0,0 +1,20 @@
+// Set to `true` to clear all on-screen bullets, giving out a semi-exponential
+// bonus for all bullets that were alive on the first frame of activity.
+// Lasts for BULLET_ZAP_FRAMES and resets to `false` afterwards.
+extern union {
+	bool active;
+	unsigned char frames; // doubles as the animation timer
+} bullet_zap;
+
+static const int BULLET_ZAP_FRAMES_PER_CEL = 4;
+
+#ifdef BULLET_ZAP_CELS
+	// ZUN bug: Effectively 1 in TH05, see bullets_update() for the cause.
+	static const int BULLET_ZAP_FRAMES = (
+		BULLET_ZAP_CELS * BULLET_ZAP_FRAMES_PER_CEL
+	);
+#endif
+
+// # of frames left during which all on-screen bullets should decay.
+// Gives a constant point bonus for every bullet decayed during that time.
+extern unsigned char bullet_clear_time;

th04/main/bullet/update.cpp

@@ -19,6 +19,7 @@ extern "C" {
 #include "th04/main/slowdown.hpp"
 #include "th04/main/spark.hpp"
 #include "th04/main/bullet/bullet.hpp"
+#include "th04/main/bullet/clearzap.hpp"
 #include "th04/main/player/player.hpp"
 }
 #include "th04/main/hud/hud.h"

th05/main/bullet/clip.cpp

@@ -10,6 +10,7 @@ extern "C" {
 #include "th04/main/playfld.hpp"
 #include "th04/main/player/player.hpp"
 #include "th04/main/bullet/bullet.hpp"
+#include "th04/main/bullet/clearzap.hpp"
 #include "th05/main/playperf.hpp"
 
 bool near bullet_template_clip(void)