160 lines
4.5 KiB
C
160 lines
4.5 KiB
C
/**
|
|
* @file wasm.h
|
|
*
|
|
* WebAssembly utility functions for libghostty-vt.
|
|
*/
|
|
|
|
#ifndef GHOSTTY_VT_WASM_H
|
|
#define GHOSTTY_VT_WASM_H
|
|
|
|
#ifdef __wasm__
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
/** @defgroup wasm WebAssembly Utilities
|
|
*
|
|
* Convenience functions for allocating various types in WebAssembly builds.
|
|
* **These are only available the libghostty-vt wasm module.**
|
|
*
|
|
* Ghostty relies on pointers to various types for ABI compatibility, and
|
|
* creating those pointers in Wasm can be tedious. These functions provide
|
|
* a purely additive set of utilities that simplify memory management in
|
|
* Wasm environments without changing the core C library API.
|
|
*
|
|
* @note These functions always use the default allocator. If you need
|
|
* custom allocation strategies, you should allocate types manually using
|
|
* your custom allocator. This is a very rare use case in the WebAssembly
|
|
* world so these are optimized for simplicity.
|
|
*
|
|
* ## Example Usage
|
|
*
|
|
* Here's a simple example of using the Wasm utilities with the key encoder:
|
|
*
|
|
* @code
|
|
* const { exports } = wasmInstance;
|
|
* const view = new DataView(wasmMemory.buffer);
|
|
*
|
|
* // Create key encoder
|
|
* const encoderPtr = exports.ghostty_wasm_alloc_opaque();
|
|
* exports.ghostty_key_encoder_new(null, encoderPtr);
|
|
* const encoder = view.getUint32(encoder, true);
|
|
*
|
|
* // Configure encoder with Kitty protocol flags
|
|
* const flagsPtr = exports.ghostty_wasm_alloc_u8();
|
|
* view.setUint8(flagsPtr, 0x1F);
|
|
* exports.ghostty_key_encoder_setopt(encoder, 5, flagsPtr);
|
|
*
|
|
* // Allocate output buffer and size pointer
|
|
* const bufferSize = 32;
|
|
* const bufPtr = exports.ghostty_wasm_alloc_u8_array(bufferSize);
|
|
* const writtenPtr = exports.ghostty_wasm_alloc_usize();
|
|
*
|
|
* // Encode the key event
|
|
* exports.ghostty_key_encoder_encode(
|
|
* encoder, eventPtr, bufPtr, bufferSize, writtenPtr
|
|
* );
|
|
*
|
|
* // Read encoded output
|
|
* const bytesWritten = view.getUint32(writtenPtr, true);
|
|
* const encoded = new Uint8Array(wasmMemory.buffer, bufPtr, bytesWritten);
|
|
* @endcode
|
|
*
|
|
* @remark The code above is pretty ugly! This is the lowest level interface
|
|
* to the libghostty-vt Wasm module. In practice, this should be wrapped
|
|
* in a higher-level API that abstracts away all this.
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Allocate an opaque pointer. This can be used for any opaque pointer
|
|
* types such as GhosttyKeyEncoder, GhosttyKeyEvent, etc.
|
|
*
|
|
* @return Pointer to allocated opaque pointer, or NULL if allocation failed
|
|
* @ingroup wasm
|
|
*/
|
|
void** ghostty_wasm_alloc_opaque(void);
|
|
|
|
/**
|
|
* Free an opaque pointer allocated by ghostty_wasm_alloc_opaque().
|
|
*
|
|
* @param ptr Pointer to free, or NULL (NULL is safely ignored)
|
|
* @ingroup wasm
|
|
*/
|
|
void ghostty_wasm_free_opaque(void **ptr);
|
|
|
|
/**
|
|
* Allocate an array of uint8_t values.
|
|
*
|
|
* @param len Number of uint8_t elements to allocate
|
|
* @return Pointer to allocated array, or NULL if allocation failed
|
|
* @ingroup wasm
|
|
*/
|
|
uint8_t* ghostty_wasm_alloc_u8_array(size_t len);
|
|
|
|
/**
|
|
* Free an array allocated by ghostty_wasm_alloc_u8_array().
|
|
*
|
|
* @param ptr Pointer to the array to free, or NULL (NULL is safely ignored)
|
|
* @param len Length of the array (must match the length passed to alloc)
|
|
* @ingroup wasm
|
|
*/
|
|
void ghostty_wasm_free_u8_array(uint8_t *ptr, size_t len);
|
|
|
|
/**
|
|
* Allocate an array of uint16_t values.
|
|
*
|
|
* @param len Number of uint16_t elements to allocate
|
|
* @return Pointer to allocated array, or NULL if allocation failed
|
|
* @ingroup wasm
|
|
*/
|
|
uint16_t* ghostty_wasm_alloc_u16_array(size_t len);
|
|
|
|
/**
|
|
* Free an array allocated by ghostty_wasm_alloc_u16_array().
|
|
*
|
|
* @param ptr Pointer to the array to free, or NULL (NULL is safely ignored)
|
|
* @param len Length of the array (must match the length passed to alloc)
|
|
* @ingroup wasm
|
|
*/
|
|
void ghostty_wasm_free_u16_array(uint16_t *ptr, size_t len);
|
|
|
|
/**
|
|
* Allocate a single uint8_t value.
|
|
*
|
|
* @return Pointer to allocated uint8_t, or NULL if allocation failed
|
|
* @ingroup wasm
|
|
*/
|
|
uint8_t* ghostty_wasm_alloc_u8(void);
|
|
|
|
/**
|
|
* Free a uint8_t allocated by ghostty_wasm_alloc_u8().
|
|
*
|
|
* @param ptr Pointer to free, or NULL (NULL is safely ignored)
|
|
* @ingroup wasm
|
|
*/
|
|
void ghostty_wasm_free_u8(uint8_t *ptr);
|
|
|
|
/**
|
|
* Allocate a single size_t value.
|
|
*
|
|
* @return Pointer to allocated size_t, or NULL if allocation failed
|
|
* @ingroup wasm
|
|
*/
|
|
size_t* ghostty_wasm_alloc_usize(void);
|
|
|
|
/**
|
|
* Free a size_t allocated by ghostty_wasm_alloc_usize().
|
|
*
|
|
* @param ptr Pointer to free, or NULL (NULL is safely ignored)
|
|
* @ingroup wasm
|
|
*/
|
|
void ghostty_wasm_free_usize(size_t *ptr);
|
|
|
|
/** @} */
|
|
|
|
#endif /* __wasm__ */
|
|
|
|
#endif /* GHOSTTY_VT_WASM_H */
|