Make everything 2x smaller

README

@@ -3,10 +3,8 @@
 This is a clone (ish) of the classic game Asteroids, written in C23
 for Linux.  To build the program, you'll need the Linux headers, a
 C23-compatible compiler and libdrm, along with its headers.  There is
-a build script that uses GCC; simply running this (./build.sh) is
+a build script that uses GCC; simply running this (`./build.sh`) is
-likely to work on many systems.  However, you will likely need to
+likely to work on many systems.
-adjust the input and video devices used (in input.c and renderer.c
-respectively) to match your system.
 
 The game directly uses Linux DRM, so it doesn't play nice with X,
 display managers etc.  You'll likely want to change to a virtual TTY

build.sh

@@ -9,5 +9,4 @@ defs="-D_POSIX_C_SOURCE=200809L"
 $cc $warn $flags $libs $defs \
 	-o asteroids \
 	asteroids.c collisions.c entity.c fb.c game.c input.c \
-	main.c maths.c physics.c scene.c renderer.c rng.c \
+	main.c maths.c physics.c scene.c renderer.c rng.c text.c
-	self_destruct.c text.c

game.c

@@ -8,7 +8,6 @@
 #include "renderer.h"
 #include "rng.h"
 #include "scene.h"
-#include "self_destruct.h"
 #include "text.h"
 
 #include <assert.h>
@@ -16,8 +15,6 @@
 #include <math.h>
 #include <string.h>
 
-#define FPS 60
-
 #define INIT_LEVEL 1
 
 #define SHIP_COLLIDE_R 0.025
@@ -26,12 +23,11 @@
 #define FIRE_JITTER 0.005
 
 #define LIN_PWR 0.00005
-#define ROT_PWR 0.002
+#define ROT_PWR 0.001
 
-#define SHOT_VEL 0.03
+#define SHOT_VEL 0.015
 #define SHOT_COLLIDE_R 0.015
-#define SHOT_MASS 0.00025
+#define SHOT_MASS 0.0005
-#define SHOT_LIFETIME_S 4
 
 #define ARROW_SCALE 0.0125
 #define ARROW_WIDTH 4
@@ -178,7 +174,6 @@ static void shoot()
 	scene_add(id, shot_verts, NELEMS(shot_verts), false);
 	physics_add(id, pos, ship->dir, vel, 0, SHOT_MASS);
 	collisions_add(id, SHOT_COLLIDE_R, SHOT_COLLIDE_PRIOR, shot_collide);
-	self_destruct_add(id, FPS * SHOT_LIFETIME_S);
 
 	const vec2_t p_ship = vec2_scale(ship->vel, ship->mass);
 	const vec2_t p_shot = vec2_scale(vel, SHOT_MASS);
@@ -218,7 +213,6 @@ static void create_field()
 	scene_clear();
 	physics_init();
 	collisions_init();
-	self_destruct_clear();
 
 	ship_entity_id = entity_add();
 	scene_add(ship_entity_id, ship_verts, NELEMS(ship_verts), true);
@@ -315,7 +309,6 @@ void game_update()
 
 	ship_update();
 	physics_update();
-	self_destruct_update();
 	collisions_update();
 	scene_update();
 
@@ -324,7 +317,7 @@ void game_update()
 	const bool items_enabled
 	    = !clear && score >= ITEM_MIN_SCORE && armour_level < 9;
 	if (items_enabled && !item
-	    && rng_canon() < 1.0f / (FPS * ITEM_SPAWN_EXP_S))
+	    && rng_canon() < 1.0f / (60 * ITEM_SPAWN_EXP_S))
 		add_item();
 }
 

self_destruct.c

@@ -1,60 +0,0 @@
-#include "self_destruct.h"
-
-#include "entity.h"
-
-#include <assert.h>
-#include <string.h>
-
-#define MAX 256U
-
-typedef struct {
-	unsigned entity_id;
-	unsigned component_id;
-	unsigned rem;
-} cmp_t;
-
-static unsigned count;
-static cmp_t cmps[MAX];
-
-static void update(unsigned new_entity_id, void *ref)
-{
-	cmp_t *c = (cmp_t *)ref;
-	c->entity_id = new_entity_id;
-}
-
-static void remove(void *ref)
-{
-	cmp_t *c = (cmp_t *)ref;
-	const cmp_t *last = cmps + (count - 1);
-	if (c < last) {
-		memcpy(c, last, sizeof(cmp_t));
-		entity_update_component(c->entity_id, c->component_id, c);
-	}
-	--count;
-}
-
-void self_destruct_clear()
-{
-	count = 0;
-}
-
-void self_destruct_update()
-{
-	for (unsigned i = 0; i < count; ++i) {
-		if (cmps[i].rem == 0)
-			entity_mark(cmps[i].entity_id);
-		else
-			--cmps[i].rem;
-	}
-}
-
-void self_destruct_add(unsigned id, unsigned frames)
-{
-	assert(count < MAX);
-	cmp_t *c = cmps + count++;
-	*c = (cmp_t) {
-		.entity_id = id,
-		.rem = frames,
-		.component_id = entity_add_component(id, update, remove, c),
-	};
-}

self_destruct.h

@@ -1,8 +0,0 @@
-#ifndef SELF_DESTRUCT_H
-#define SELF_DESTRUCT_H
-
-void self_destruct_clear();
-void self_destruct_update();
-void self_destruct_add(unsigned id, unsigned frames);
-
-#endif