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ReC98/th04/main/custom.hpp

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[Reverse-engineering] [th04] Custom entities: Structure Part of P0240, funded by JonathKane.
2023-05-04 20:44:11 +00:00
// Fixed-size memory block for entities of a custom type, specific to a stage
// or boss portion. To define such a custom type, declare your own structure,
// then reinterpret_cast [custom_entities] to that type.
[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
[Maintenance] #include each header's dependencies within the header itself OK, this is the big one. We still keep using `#include` guards only where we absolutely need to, but with each header now being valid in isolation, this can now actually help *minimize* the length of each translation unit's `#include` list. Turns out that after removing all the duplicates, we only *actually* need to guard 29 headers across all 5 games. Part of P0285, funded by [Anonymous] and iruleatgames.
2024-05-25 18:31:09 +00:00
#include "th04/main/playfld.hpp"
[Maintenance] [th04/th05] Custom entities: Move declarations to TH04 Part of P0240, funded by JonathKane.
2023-05-03 17:38:15 +00:00
#if (GAME == 5)
#define CUSTOM_COUNT 64
[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
[Maintenance] [th04/th05] Custom entities: Move declarations to TH04 Part of P0240, funded by JonathKane.
2023-05-03 17:38:15 +00:00
struct custom_t {
uint8_t flag;
uint8_t angle;
PlayfieldMotion pos;
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
};
[Reverse-engineering] [th04] Custom entities: Structure Part of P0240, funded by JonathKane.
2023-05-04 20:44:11 +00:00
#else
#define CUSTOM_COUNT 32
struct custom_t {
uint8_t flag;
uint8_t angle;
point_t center;
int16_t val1;
Subpixel origin_y;
PlayfieldPoint velocity;
uint16_t val2;
int16_t distance;
int16_t val3;
int16_t hp;
int16_t damage_this_frame;
uint8_t val4;
uint8_t angle_speed;
};
[Maintenance] [th04/th05] Custom entities: Move declarations to TH04 Part of P0240, funded by JonathKane.
2023-05-03 17:38:15 +00:00
#endif
[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
[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
[Maintenance] Add a static_assert() polyfill to platform.h Part of P0198, funded by Lmocinemod and Ember2528.
2022-06-09 15:03:49 +00:00
#define custom_assert_count(derived_type, derived_count) \
static_assert( \
(sizeof(derived_type) * derived_count) <= \
(sizeof(custom_t) * CUSTOM_COUNT) \
)