From b8c213eaf6183208f87bad4cd583958ae9967cc9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Wed, 3 Jan 2018 16:53:27 +0100
Subject: Add many sdl_keyboard functions

---
 c_src/sdl_keyboard.c | 173 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)

(limited to 'c_src/sdl_keyboard.c')

diff --git a/c_src/sdl_keyboard.c b/c_src/sdl_keyboard.c
index f88b5ca..0e961a8 100644
--- a/c_src/sdl_keyboard.c
+++ b/c_src/sdl_keyboard.c
@@ -14,6 +14,161 @@
 
 #include "esdl2.h"
 
+// get_key_from_name
+
+NIF_FUNCTION(get_key_from_name)
+{
+	ErlNifBinary bin;
+	char* name;
+	SDL_Keycode key;
+
+	BADARG_IF(!enif_inspect_binary(env, argv[0], &bin));
+
+	name = malloc(bin.size + 1);
+	memcpy(name, bin.data, bin.size);
+	name[bin.size] = '\0';
+
+	key = SDL_GetKeyFromName(name);
+
+	free(name);
+
+	if (key == SDLK_UNKNOWN)
+		return atom_undefined;
+
+	return enif_make_int(env, key);
+}
+
+// get_key_from_scancode
+
+NIF_FUNCTION(get_key_from_scancode)
+{
+	SDL_Scancode scancode;
+	SDL_Keycode key;
+
+	BADARG_IF(!enif_get_uint(env, argv[0], &scancode));
+
+	key = SDL_GetKeyFromScancode(scancode);
+
+	if (key == SDLK_UNKNOWN)
+		return atom_undefined;
+
+	return enif_make_int(env, key);
+}
+
+// get_key_name
+//
+// SDL_GetKeyName is not thread-safe as it stores the returned
+// value in a static array in at least some cases. We use the
+// NIF thread to avoid any issues.
+
+NIF_CALL_HANDLER(thread_get_key_name)
+{
+	const char* name;
+	ErlNifBinary bin;
+
+	name = SDL_GetKeyName((long)args[0]);
+
+	enif_alloc_binary(strlen(name), &bin);
+
+	memcpy(bin.data, name, bin.size);
+
+	return enif_make_binary(env, &bin);
+}
+
+NIF_FUNCTION(get_key_name)
+{
+	SDL_Keycode key;
+
+	BADARG_IF(!enif_get_int(env, argv[0], &key));
+
+	return nif_thread_call(env, thread_get_key_name, 1, key);
+}
+
+// get_scancode_from_key
+
+NIF_FUNCTION(get_scancode_from_key)
+{
+	SDL_Keycode key;
+	SDL_Scancode scancode;
+
+	BADARG_IF(!enif_get_int(env, argv[0], &key));
+
+	scancode = SDL_GetScancodeFromKey(key);
+
+	if (scancode == SDL_SCANCODE_UNKNOWN)
+		return atom_undefined;
+
+	return enif_make_uint(env, scancode);
+}
+
+// get_scancode_from_name
+
+NIF_FUNCTION(get_scancode_from_name)
+{
+	ErlNifBinary bin;
+	char* name;
+	SDL_Scancode scancode;
+
+	BADARG_IF(!enif_inspect_binary(env, argv[0], &bin));
+
+	name = malloc(bin.size + 1);
+	memcpy(name, bin.data, bin.size);
+	name[bin.size] = '\0';
+
+	scancode = SDL_GetScancodeFromName(name);
+
+	free(name);
+
+	if (scancode == SDL_SCANCODE_UNKNOWN)
+		return atom_undefined;
+
+	return enif_make_uint(env, scancode);
+}
+
+// get_scancode_name
+//
+// The SDL_GetScancodeName function only ever points to static
+// data and is therefore thread-safe, unlike SDL_GetKeyName.
+
+NIF_FUNCTION(get_scancode_name)
+{
+	SDL_Scancode scancode;
+	const char* name;
+	ErlNifBinary bin;
+
+	BADARG_IF(!enif_get_uint(env, argv[0], &scancode));
+
+	name = SDL_GetScancodeName(scancode);
+
+	enif_alloc_binary(strlen(name), &bin);
+
+	memcpy(bin.data, name, bin.size);
+
+	return enif_make_binary(env, &bin);
+}
+
+// @todo get_keyboard_focus
+// @todo get_keyboard_state
+
+// get_mod_state
+
+NIF_CALL_HANDLER(thread_get_mod_state)
+{
+	SDL_Keymod mod;
+
+	mod = SDL_GetModState();
+
+	return keymod_flags_to_list(env, mod);
+}
+
+NIF_FUNCTION(get_mod_state)
+{
+	return nif_thread_call(env, thread_get_mod_state, 0);
+}
+
+// @todo has_screen_keyboard_support
+// @todo is_screen_keyboard_shown
+
 // is_text_input_active
 
 NIF_CALL_HANDLER(thread_is_text_input_active)
@@ -29,6 +184,24 @@ NIF_FUNCTION(is_text_input_active)
 	return nif_thread_call(env, thread_is_text_input_active, 0);
 }
 
+// set_mod_state
+
+NIF_CAST_HANDLER(thread_set_mod_state)
+{
+	SDL_SetModState((long)args[0]);
+}
+
+NIF_FUNCTION(set_mod_state)
+{
+	Uint16 mod;
+
+	BADARG_IF(!keymod_list_to_flags(env, argv[0], &mod));
+
+	return nif_thread_cast(env, thread_set_mod_state, 1, mod);
+}
+
+// @todo set_text_input_rect
+
 // start_text_input
 
 NIF_CAST_HANDLER(thread_start_text_input)
-- 
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