simplify entityimpl a bit

src/deathpart.c

@@ -3,7 +3,7 @@
 #include "entityimpl.h"
 #include <stdlib.h>
 
-IMPL_UPDATE() {
+IMPL(update) {
 	if (this->deathpart.skip == 0) {
 		this->vel[1] *= AIR_RESISTANCE;
 		this->vel[1] += GRAVITY;
@@ -11,16 +11,16 @@ IMPL_UPDATE() {
 		this->deathpart.skip = 3;
 	} else
 		this->deathpart.skip -= 1;
-} IMPL_END
+}
 
-IMPL_DRAW() {
+IMPL(draw) {
 	LZY_DrawSetColor(BLACK);
 	if (this->width == 1)
 		(void)LZY_DrawPoint(this->pos[0], this->pos[1]);
 	else
 		(void)LZY_DrawRect(this->pos[0], this->pos[1],
 		                   this->width, this->width);
-} IMPL_END
+}
 
 IMPL_INIT(deathpart) {
 	this->ignore_solids = true;

src/entity.c

@@ -20,7 +20,7 @@ unsigned int
 entity_type(const char *type)
 {
 	for (unsigned int i = 0; i < num_entitytags; i++)
-		if (strcmp(type, entitytags[i]) == 0)
+		if (strcmp(type, entitytags[i].name) == 0)
 			return i + 1;
 	fprintf(stderr, "unknown type '%s'\n", type);
 	return 0;
@@ -100,5 +100,5 @@ entity_move(Entity *this, Game *g)
 Entity *
 entity_init(Entity *this, unsigned int type, int x, int y)
 {
-	return entityinits[type - 1](this, x, y);
+	return entitytags[type - 1].init(this, x, y);
 }

src/entity.h

@@ -11,8 +11,8 @@ enum { ET_NONE = 0 };
 typedef struct Entity Entity;
 struct Entity {
 	unsigned long uuid;
-	Entity *(*update)(Entity *this, struct Game *g);
-	Entity *(*draw)(Entity *this, struct Game *g);
+	void (*update)(Entity *this, struct Game *g);
+	void (*draw)(Entity *this, struct Game *g);
 	unsigned int type;
 	int id;
 	int pos[2];

src/entityimpl.h

@@ -5,16 +5,13 @@
 #include "entitytag.h"
 #include <string.h>
 
-#define IMPL_UPDATE() static Entity * \
-update([[maybe_unused]] Entity *this, [[maybe_unused]] Game *g) {
-
-#define IMPL_DRAW() static Entity * \
-draw([[maybe_unused]] Entity *this, [[maybe_unused]] Game *g) {
+#define IMPL(X) static void \
+X([[maybe_unused]] Entity *this, [[maybe_unused]] Game *g)
 
 #define IMPL_INIT(X) static Entity *init(Entity *this, int x, int y); \
 __attribute__((constructor)) static void init_tag() { \
-	entityinits[num_entitytags] = init; \
-	entitytags[num_entitytags++] = #X; \
+	entitytags[num_entitytags].init = init; \
+	entitytags[num_entitytags++].name = #X; \
 } \
 static Entity * \
 init(Entity *this, int x, int y) { do { \

src/entitytag.c

@@ -1,5 +1,4 @@
 #include "entitytag.h"
 
 unsigned int num_entitytags = 0;
-const char *entitytags[256] = {};
-EntityInit entityinits[256] = {};
+EntityTag entitytags[256] = {};

src/entitytag.h

@@ -1,7 +1,10 @@
 #pragma once
 #include "entity.h"
 
-typedef Entity *(*EntityInit)(Entity *this, int x, int y);
+typedef struct {
+	const char *name;
+	Entity *(*init)(Entity *this, int x, int y);
+} EntityTag;
+
 extern unsigned int num_entitytags;
-extern const char *entitytags[256];
-extern EntityInit entityinits[256];
+extern EntityTag entitytags[256];

src/exit.c

@@ -1,14 +1,14 @@
 #include "entityimpl.h"
 #include "rotrect.h"
 
-IMPL_UPDATE() {
-} IMPL_END
+IMPL(update) {
+}
 
-IMPL_DRAW() {
+IMPL(draw) {
 	LZY_DrawSetColor(BLACK);
 	rotrect(this->pos[0], this->pos[1],
 	        this->width, this->height, 0.2 * this->exit.dir);
-} IMPL_END
+}
 
 IMPL_INIT(exit) {
 	this->width = 12;

src/player.c

@@ -5,7 +5,7 @@
 #include "rotrect.h"
 #include <math.h>
 
-IMPL_UPDATE() {
+IMPL(update) {
 	const int on_ground = entity_collide(this, g, 0, 1);
 
 	this->vel[0] = 2.0 * this->player.dirx;
@@ -71,15 +71,15 @@ IMPL_UPDATE() {
 
 	if (entity_place_meeting(this, g, entity_type("exit")) != NULL)
 		g->queue_next_scene = true;
-} IMPL_END
+}
 
-IMPL_DRAW() {
+IMPL(draw) {
 	LZY_DrawSetColor(BLACK);
 	const double width = this->width * this->player.scale_x + 2;
 	const double height = this->height * this->player.scale_y + 2;
 	rotrect(this->pos[0] - 1, this->pos[1] - 1,
 	        width, height, this->player.angle);
-} IMPL_END
+}
 
 IMPL_INIT(player) {
 	this->width = 10;

src/spike.c

@@ -1,13 +1,12 @@
 #include "entityimpl.h"
 #include "rotrect.h"
 
-IMPL_UPDATE() {
-} IMPL_END
+IMPL(update) {}
 
-IMPL_DRAW() {
+IMPL(draw) {
 	rotrect_draw(g->spike_rect, this->pos[0], this->pos[1]);
 	rotrect_draw(g->spike_irect, this->pos[0], this->pos[1]);
-} IMPL_END
+}
 
 IMPL_INIT(spike) {
 	this->height = this->width = 8;