From 276a44441d8795cd29a215dff35ab6aefcdc6557 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= Date: Wed, 21 Oct 2015 03:41:03 +0200 Subject: Add sdl_hints:add_callback/3 function This also sets up esdl2 to start accepting callbacks. The module/process esdl2_callbacks must always be running for that purpose, so esdl2 was made an OTP application instead of a simple library. Implementation of the rest of SDL_hints will follow in subsequent commits. --- c_src/esdl2.h | 7 ++++ c_src/internal.c | 35 +++++++++++++++++++ c_src/sdl_hints.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 143 insertions(+) create mode 100644 c_src/internal.c create mode 100644 c_src/sdl_hints.c (limited to 'c_src') diff --git a/c_src/esdl2.h b/c_src/esdl2.h index 530abc4..df16664 100644 --- a/c_src/esdl2.h +++ b/c_src/esdl2.h @@ -27,6 +27,7 @@ A(blend) \ A(borderless) \ A(button) \ + A(callback) \ A(caps) \ A(centered) \ A(charged) \ @@ -133,6 +134,8 @@ #define NIF_FUNCTION_NAME(f) esdl2_ ## f #define NIF_FUNCTIONS(F) \ + /* internal */ \ + F(register_callback_process, 0) \ /* sdl */ \ F(init, 1) \ F(init_subsystem, 1) \ @@ -166,6 +169,8 @@ /* sdl_gl */ \ F(gl_create_context, 1) \ F(gl_swap_window, 1) \ + /* sdl_hints */ \ + F(add_hint_callback, 3) \ /* sdl_keyboard */ \ F(is_text_input_active, 0) \ F(start_text_input, 0) \ @@ -254,6 +259,8 @@ NIF_FUNCTIONS(NIF_FUNCTION_H_DECL) // -- +ErlNifPid* get_callback_process(); + #define sdl_error_tuple(env) \ enif_make_tuple2(env, \ atom_error, \ diff --git a/c_src/internal.c b/c_src/internal.c new file mode 100644 index 0000000..0c58476 --- /dev/null +++ b/c_src/internal.c @@ -0,0 +1,35 @@ +// Copyright (c) 2015, Loïc Hoguin +// +// Permission to use, copy, modify, and/or distribute this software for any +// purpose with or without fee is hereby granted, provided that the above +// copyright notice and this permission notice appear in all copies. +// +// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + +#include "esdl2.h" + +// @todo Make thread-safe. + +// register_callback_process + +ErlNifPid callback_process; + +NIF_FUNCTION(register_callback_process) +{ + BADARG_IF(!enif_self(env, &callback_process)); + + return atom_ok; +} + +// get_callback_process + +ErlNifPid* get_callback_process() +{ + return &callback_process; +} diff --git a/c_src/sdl_hints.c b/c_src/sdl_hints.c new file mode 100644 index 0000000..fe4eceb --- /dev/null +++ b/c_src/sdl_hints.c @@ -0,0 +1,101 @@ +// Copyright (c) 2015, Loïc Hoguin +// +// Permission to use, copy, modify, and/or distribute this software for any +// purpose with or without fee is hereby granted, provided that the above +// copyright notice and this permission notice appear in all copies. +// +// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + +#include "esdl2.h" + +// SDL_HintCallback + +typedef struct esdl2_callback { + char* module; + char* function; +} esdl2_callback; + +void esdl2_hint_callback(void* userdata, const char* name, const char* oldValue, const char* newValue) +{ + ErlNifEnv* env = enif_alloc_env(); + esdl2_callback* callback = (esdl2_callback*)userdata; + ERL_NIF_TERM old; + ERL_NIF_TERM new; + + if (oldValue == NULL) + old = atom_undefined; + else + old = enif_make_string(env, oldValue, ERL_NIF_LATIN1); + + if (newValue == NULL) + new = atom_undefined; + else + new = enif_make_string(env, newValue, ERL_NIF_LATIN1); + + enif_send(NULL, get_callback_process(), env, + enif_make_tuple4(env, atom_callback, + enif_make_atom(env, callback->module), + enif_make_atom(env, callback->function), + enif_make_list3(env, + enif_make_string(env, name, ERL_NIF_LATIN1), + old, + new))); + + enif_free_env(env); +} + +// add_hint_callback +// @todo We must free the userdata in SDL_DelHintCallback. + +NIF_CAST_HANDLER(thread_add_hint_callback) +{ + esdl2_callback* callback = (esdl2_callback*)enif_alloc(sizeof(esdl2_callback)); + + callback->module = args[1]; + callback->function = args[2]; + + SDL_AddHintCallback(args[0], &esdl2_hint_callback, callback); + + enif_free(args[0]); +} + +NIF_FUNCTION(add_hint_callback) +{ + unsigned int hint_len, module_len, function_len; + char* hint; + char* module; + char* function; + + BADARG_IF(!enif_get_list_length(env, argv[0], &hint_len)); + BADARG_IF(!enif_get_atom_length(env, argv[1], &module_len, ERL_NIF_LATIN1)); + BADARG_IF(!enif_get_atom_length(env, argv[2], &function_len, ERL_NIF_LATIN1)); + + hint = (char*)enif_alloc(hint_len + 1); + if (!enif_get_string(env, argv[0], hint, hint_len + 1, ERL_NIF_LATIN1)) { + enif_free(hint); + return enif_make_badarg(env); + } + + module = (char*)enif_alloc(module_len + 1); + if (!enif_get_atom(env, argv[1], module, module_len + 1, ERL_NIF_LATIN1)) { + enif_free(hint); + enif_free(module); + return enif_make_badarg(env); + } + + function = (char*)enif_alloc(function_len + 1); + if (!enif_get_atom(env, argv[2], function, function_len + 1, ERL_NIF_LATIN1)) { + enif_free(hint); + enif_free(module); + enif_free(function); + return enif_make_badarg(env); + } + + return nif_thread_cast(env, thread_add_hint_callback, 3, hint, module, function); +} -- cgit v1.2.3