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#ifndef _TIL_TAP_H
#define _TIL_TAP_H
#include <stdint.h>
#include <string.h>
#include "til_jenkins.h"
/* A "tap" is a named binding of a local variable+pointer to that variable.
*
* Its purpose is to facilitate exposing local variables controlling rendering
* to potential external influence.
*
* The tap itself is not a registry or otherwise discoverable entity by itself.
* This is strictly just the local glue, Other pieces must index and tie taps
* into streams or settings stuff for addressing them by name at a path or other
* means.
*
* Note the intended way for taps to work is that the caller will always access their
* local variables indirectly via the pointers they provided when initializing the taps.
* There will be a function for managing the tap the caller must call before accessing
* the variable indirectly as well. It's that function which will update the indirection
* pointer to potentially point elsewhere if another tap is driving the variable.
*/
/* These are all the supported tap types, nothing is set in stone this just
* seemed like the likely stuff to need. Feel free to add anything as needed.
*/
typedef enum til_tap_type_t {
TIL_TAP_TYPE_I8,
TIL_TAP_TYPE_I16,
TIL_TAP_TYPE_I32,
TIL_TAP_TYPE_I64,
TIL_TAP_TYPE_U8,
TIL_TAP_TYPE_U16,
TIL_TAP_TYPE_U32,
TIL_TAP_TYPE_U64,
TIL_TAP_TYPE_FLOAT,
TIL_TAP_TYPE_DOUBLE,
TIL_TAP_TYPE_V2F, /* 2D vector of floats */
TIL_TAP_TYPE_V3F, /* 3D vector of floats */
TIL_TAP_TYPE_V4F, /* 4D vector of floats */
TIL_TAP_TYPE_M4F, /* 4x4 float matrix */
TIL_TAP_TYPE_VOIDP, /* escape hatch for when you're getting exotic and want to bypass type checking */
TIL_TAP_TYPE_MAX,
} til_tap_type_t;
/* this is deliberately left entirely public so taps can be easily embedded in contexts */
typedef struct til_tap_t {
til_tap_type_t type;
void **ptr; /* points at the caller-provided tap-managed indirection pointer */
size_t n_elems; /* when > 1, *ptr is an array of n_elems elements. Otherwise individual variable. */
void *elems; /* points at the first element of type type, may or may not be an array of them */
const char *name;
uint32_t name_hash; /* cached hash of name, set once @ initialization */
} til_tap_t;
/* just some forward declared higher-order vector and matrix types for the wrappers */
typedef struct v2f_t v2f_t;
typedef struct v3f_t v3f_t;
typedef struct v4f_t v4f_t;
typedef struct m4f_t m4f_t;
/* This is the bare tap initializer but use the type-checked wrappers below and add one if one's missing */
static inline til_tap_t til_tap_init(til_tap_type_t type, void *ptr, size_t n_elems, void *elems, const char *name)
{
assert(type < TIL_TAP_TYPE_MAX);
assert(ptr);
assert(n_elems);
assert(elems);
assert(name);
*((void **)ptr) = elems;
return (til_tap_t){
.type = type,
.ptr = ptr,
.n_elems = n_elems,
.elems = elems,
.name = name,
.name_hash = til_jenkins((uint8_t *)name, strlen(name)),
};
}
/* typed wrappers, just supply n_elems=1 for individual variables - note n_elems is just a defensive
* programming sanity check to catch callers mismatching array sizes
*/
static inline til_tap_t til_tap_init_i8(int8_t **ptr, size_t n_elems, int8_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_I8, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_i16(int16_t **ptr, size_t n_elems, int16_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_I16, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_i32(int32_t **ptr, size_t n_elems, int32_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_I32, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_i64(int64_t **ptr, size_t n_elems, int64_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_I64, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_u8(uint8_t **ptr, size_t n_elems, uint8_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_U8, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_u16(uint16_t **ptr, size_t n_elems, uint16_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_U16, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_u32(uint32_t **ptr, size_t n_elems, uint32_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_U32, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_u64(uint64_t **ptr, size_t n_elems, uint64_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_U64, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_float(float **ptr, size_t n_elems, float *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_FLOAT, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_double(double **ptr, size_t n_elems, double *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_DOUBLE, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_v2f(v2f_t **ptr, size_t n_elems, v2f_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_V2F, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_v3f(v3f_t **ptr, size_t n_elems, v3f_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_V3F, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_v4f(v4f_t **ptr, size_t n_elems, v4f_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_V4F, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_m4f(m4f_t **ptr, size_t n_elems, m4f_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_M4F, ptr, n_elems, elems, name);
}
static inline til_tap_t til_tap_init_til_tap_voidp(void **ptr, size_t n_elems, til_tap_t *elems, const char *name)
{
return til_tap_init(TIL_TAP_TYPE_VOIDP, ptr, n_elems, elems, name);
}
#endif
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