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ReC98/th05/main/custom.h

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[Reverse-engineering] [th05] Custom entity structure On the surface, TH05 uses one single 26-byte structure for • the Stage 2 starfield, • Alice's puppets, • curve bullet heads, • Mai's snowballs and Yuki's fireballs, • Yumeko's knives, • and Shinki's 32×32 bullets. But looking closer, it turns out that the fields of all these have very different semantics, and in some cases, even different types. uth05win treated all of those as distinct structures, and we're going to do the same, merely overlaying the pointers onto the same generic array. Part of P0078, funded by iruleatgames and -Tom-.
2020-02-25 21:02:44 +00:00
// Memory for up to 64 entities of a single extra custom type, specific to a
// stage or boss portion, with sizeof(custom_t) bytes per entity.
// To define such a custom type, declare your own structure, then
// reinterpret_cast [custom_entities] to that type.
#define CUSTOM_COUNT 64
typedef struct {
uint8_t flag;
uint8_t angle;
[Maintenance] Turn motion_t into a template motion_t is also used for certain animations in MAINE.EXE, so not all instances refer to entities in playfield space. Explicitly specifying the latter now allows us to gain… Part of P0149, funded by Blue Bolt, Ember2528, and -Tom-.
2021-06-30 14:30:06 +00:00
PlayfieldMotion pos;
[Reverse-engineering] [th05] Custom entity structure On the surface, TH05 uses one single 26-byte structure for • the Stage 2 starfield, • Alice's puppets, • curve bullet heads, • Mai's snowballs and Yuki's fireballs, • Yumeko's knives, • and Shinki's 32×32 bullets. But looking closer, it turns out that the fields of all these have very different semantics, and in some cases, even different types. uth05win treated all of those as distinct structures, and we're going to do the same, merely overlaying the pointers onto the same generic array. Part of P0078, funded by iruleatgames and -Tom-.
2020-02-25 21:02:44 +00:00
uint16_t val1;
uint16_t val2;
int16_t sprite;
int16_t val3;
int16_t damage;
SubpixelLength8 speed;
int8_t padding; // Unused across all custom entities in ZUN's code
} custom_t;
[Decompilation] [th05] Curved bullets: Update function The algorithm for gradually rotating these clockwise or counterclockwise towards the player could have been 5 lines long. ZUN blows it up to 26 lines. Also, a 16×16 killbox for the head node, and a 12×12 one for trail nodes. Part of P0185, funded by [Anonymous], -Tom-, and Blue Bolt.
2022-02-20 14:48:41 +00:00
extern custom_t custom_entities[CUSTOM_COUNT];
[Reverse-engineering] [th05] Custom entity structure On the surface, TH05 uses one single 26-byte structure for • the Stage 2 starfield, • Alice's puppets, • curve bullet heads, • Mai's snowballs and Yuki's fireballs, • Yumeko's knives, • and Shinki's 32×32 bullets. But looking closer, it turns out that the fields of all these have very different semantics, and in some cases, even different types. uth05win treated all of those as distinct structures, and we're going to do the same, merely overlaying the pointers onto the same generic array. Part of P0078, funded by iruleatgames and -Tom-.
2020-02-25 21:02:44 +00:00
#define CUSTOM_VERIFY(derived_type, derived_count) \
((void)sizeof(char[1 - 2*!!( \
(sizeof(derived_type) * derived_count) \
> (sizeof(custom_t) * CUSTOM_COUNT) \
)]))