mirror of
https://github.com/godotengine/godot
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397 lines
14 KiB
C++
397 lines
14 KiB
C++
/**************************************************************************/
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/* multiplayer_api.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "multiplayer_api.h"
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#include "core/debugger/engine_debugger.h"
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#include "core/io/marshalls.h"
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#include <stdint.h>
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#ifdef DEBUG_ENABLED
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#include "core/os/os.h"
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#endif
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StringName MultiplayerAPI::default_interface;
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void MultiplayerAPI::set_default_interface(const StringName &p_interface) {
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ERR_FAIL_COND_MSG(!ClassDB::is_parent_class(p_interface, MultiplayerAPI::get_class_static()), vformat("Can't make %s the default multiplayer interface since it does not extend MultiplayerAPI.", p_interface));
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default_interface = StringName(p_interface, true);
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}
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StringName MultiplayerAPI::get_default_interface() {
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return default_interface;
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}
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Ref<MultiplayerAPI> MultiplayerAPI::create_default_interface() {
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if (default_interface != StringName()) {
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return Ref<MultiplayerAPI>(Object::cast_to<MultiplayerAPI>(ClassDB::instantiate(default_interface)));
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}
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return Ref<MultiplayerAPI>(memnew(MultiplayerAPIExtension));
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}
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// The variant is compressed and encoded; The first byte contains all the meta
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// information and the format is:
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// - The first LSB 6 bits are used for the variant type.
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// - The next two bits are used to store the encoding mode.
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// - Boolean values uses the encoding mode to store the value.
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#define VARIANT_META_TYPE_MASK 0x3F
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#define VARIANT_META_EMODE_MASK 0xC0
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#define VARIANT_META_BOOL_MASK 0x80
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#define ENCODE_8 0 << 6
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#define ENCODE_16 1 << 6
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#define ENCODE_32 2 << 6
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#define ENCODE_64 3 << 6
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Error MultiplayerAPI::encode_and_compress_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bool p_allow_object_decoding) {
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// Unreachable because `VARIANT_MAX` == 38 and `ENCODE_VARIANT_MASK` == 77
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CRASH_COND(p_variant.get_type() > VARIANT_META_TYPE_MASK);
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uint8_t *buf = r_buffer;
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r_len = 0;
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uint8_t encode_mode = 0;
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switch (p_variant.get_type()) {
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case Variant::BOOL: {
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if (buf) {
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// We don't use encode_mode for booleans, so we can use it to store the value.
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buf[0] = (p_variant.operator bool()) ? (1 << 7) : 0;
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buf[0] |= p_variant.get_type();
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}
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r_len += 1;
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} break;
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case Variant::INT: {
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if (buf) {
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// Reserve the first byte for the meta.
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buf += 1;
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}
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r_len += 1;
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int64_t val = p_variant;
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if (val <= (int64_t)INT8_MAX && val >= (int64_t)INT8_MIN) {
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// Use 8 bit
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encode_mode = ENCODE_8;
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if (buf) {
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buf[0] = val;
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}
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r_len += 1;
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} else if (val <= (int64_t)INT16_MAX && val >= (int64_t)INT16_MIN) {
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// Use 16 bit
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encode_mode = ENCODE_16;
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if (buf) {
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encode_uint16(val, buf);
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}
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r_len += 2;
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} else if (val <= (int64_t)INT32_MAX && val >= (int64_t)INT32_MIN) {
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// Use 32 bit
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encode_mode = ENCODE_32;
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if (buf) {
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encode_uint32(val, buf);
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}
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r_len += 4;
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} else {
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// Use 64 bit
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encode_mode = ENCODE_64;
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if (buf) {
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encode_uint64(val, buf);
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}
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r_len += 8;
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}
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// Store the meta
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if (buf) {
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buf -= 1;
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buf[0] = encode_mode | p_variant.get_type();
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}
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} break;
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default:
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// Any other case is not yet compressed.
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Error err = encode_variant(p_variant, r_buffer, r_len, p_allow_object_decoding);
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if (err != OK) {
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return err;
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}
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if (r_buffer) {
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// The first byte is not used by the marshaling, so store the type
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// so we know how to decompress and decode this variant.
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r_buffer[0] = p_variant.get_type();
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}
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}
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return OK;
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}
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Error MultiplayerAPI::decode_and_decompress_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int *r_len, bool p_allow_object_decoding) {
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const uint8_t *buf = p_buffer;
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int len = p_len;
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ERR_FAIL_COND_V(len < 1, ERR_INVALID_DATA);
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uint8_t type = buf[0] & VARIANT_META_TYPE_MASK;
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uint8_t encode_mode = buf[0] & VARIANT_META_EMODE_MASK;
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ERR_FAIL_COND_V(type >= Variant::VARIANT_MAX, ERR_INVALID_DATA);
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switch (type) {
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case Variant::BOOL: {
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bool val = (buf[0] & VARIANT_META_BOOL_MASK) > 0;
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r_variant = val;
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if (r_len) {
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*r_len = 1;
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}
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} break;
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case Variant::INT: {
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buf += 1;
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len -= 1;
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if (r_len) {
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*r_len = 1;
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}
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if (encode_mode == ENCODE_8) {
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// 8 bits.
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ERR_FAIL_COND_V(len < 1, ERR_INVALID_DATA);
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int8_t val = buf[0];
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r_variant = val;
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if (r_len) {
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(*r_len) += 1;
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}
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} else if (encode_mode == ENCODE_16) {
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// 16 bits.
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ERR_FAIL_COND_V(len < 2, ERR_INVALID_DATA);
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int16_t val = decode_uint16(buf);
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r_variant = val;
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if (r_len) {
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(*r_len) += 2;
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}
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} else if (encode_mode == ENCODE_32) {
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// 32 bits.
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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int32_t val = decode_uint32(buf);
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r_variant = val;
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if (r_len) {
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(*r_len) += 4;
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}
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} else {
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// 64 bits.
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ERR_FAIL_COND_V(len < 8, ERR_INVALID_DATA);
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int64_t val = decode_uint64(buf);
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r_variant = val;
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if (r_len) {
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(*r_len) += 8;
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}
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}
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} break;
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default:
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Error err = decode_variant(r_variant, p_buffer, p_len, r_len, p_allow_object_decoding);
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if (err != OK) {
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return err;
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}
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}
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return OK;
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}
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Error MultiplayerAPI::encode_and_compress_variants(const Variant **p_variants, int p_count, uint8_t *p_buffer, int &r_len, bool *r_raw, bool p_allow_object_decoding) {
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r_len = 0;
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int size = 0;
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if (p_count == 0) {
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if (r_raw) {
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*r_raw = true;
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}
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return OK;
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}
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// Try raw encoding optimization.
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if (r_raw && p_count == 1) {
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*r_raw = false;
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const Variant &v = *(p_variants[0]);
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if (v.get_type() == Variant::PACKED_BYTE_ARRAY) {
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*r_raw = true;
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const PackedByteArray pba = v;
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if (p_buffer) {
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memcpy(p_buffer, pba.ptr(), pba.size());
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}
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r_len += pba.size();
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} else {
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encode_and_compress_variant(v, p_buffer, size, p_allow_object_decoding);
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r_len += size;
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}
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return OK;
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}
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// Regular encoding.
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for (int i = 0; i < p_count; i++) {
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const Variant &v = *(p_variants[i]);
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encode_and_compress_variant(v, p_buffer ? p_buffer + r_len : nullptr, size, p_allow_object_decoding);
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r_len += size;
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}
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return OK;
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}
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Error MultiplayerAPI::decode_and_decompress_variants(Vector<Variant> &r_variants, const uint8_t *p_buffer, int p_len, int &r_len, bool p_raw, bool p_allow_object_decoding) {
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r_len = 0;
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int argc = r_variants.size();
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if (argc == 0 && p_raw) {
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return OK;
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}
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ERR_FAIL_COND_V(p_raw && argc != 1, ERR_INVALID_DATA);
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if (p_raw) {
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r_len = p_len;
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PackedByteArray pba;
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pba.resize(p_len);
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memcpy(pba.ptrw(), p_buffer, p_len);
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r_variants.write[0] = pba;
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return OK;
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}
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for (int i = 0; i < argc; i++) {
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ERR_FAIL_COND_V_MSG(r_len >= p_len, ERR_INVALID_DATA, "Invalid packet received. Size too small.");
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int vlen;
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Error err = MultiplayerAPI::decode_and_decompress_variant(r_variants.write[i], &p_buffer[r_len], p_len - r_len, &vlen, p_allow_object_decoding);
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ERR_FAIL_COND_V_MSG(err != OK, err, "Invalid packet received. Unable to decode state variable.");
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r_len += vlen;
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}
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return OK;
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}
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Error MultiplayerAPI::_rpc_bind(int p_peer, Object *p_object, const StringName &p_method, Array p_args) {
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Vector<Variant> args;
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Vector<const Variant *> argsp;
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args.resize(p_args.size());
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argsp.resize(p_args.size());
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Variant *ptr = args.ptrw();
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const Variant **pptr = argsp.ptrw();
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for (int i = 0; i < p_args.size(); i++) {
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ptr[i] = p_args[i];
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pptr[i] = &ptr[i];
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}
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return rpcp(p_object, p_peer, p_method, argsp.size() ? argsp.ptrw() : nullptr, argsp.size());
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}
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void MultiplayerAPI::_bind_methods() {
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ClassDB::bind_method(D_METHOD("has_multiplayer_peer"), &MultiplayerAPI::has_multiplayer_peer);
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ClassDB::bind_method(D_METHOD("get_multiplayer_peer"), &MultiplayerAPI::get_multiplayer_peer);
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ClassDB::bind_method(D_METHOD("set_multiplayer_peer", "peer"), &MultiplayerAPI::set_multiplayer_peer);
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ClassDB::bind_method(D_METHOD("get_unique_id"), &MultiplayerAPI::get_unique_id);
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ClassDB::bind_method(D_METHOD("is_server"), &MultiplayerAPI::is_server);
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ClassDB::bind_method(D_METHOD("get_remote_sender_id"), &MultiplayerAPI::get_remote_sender_id);
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ClassDB::bind_method(D_METHOD("poll"), &MultiplayerAPI::poll);
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ClassDB::bind_method(D_METHOD("rpc", "peer", "object", "method", "arguments"), &MultiplayerAPI::_rpc_bind, DEFVAL(Array()));
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ClassDB::bind_method(D_METHOD("object_configuration_add", "object", "configuration"), &MultiplayerAPI::object_configuration_add);
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ClassDB::bind_method(D_METHOD("object_configuration_remove", "object", "configuration"), &MultiplayerAPI::object_configuration_remove);
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ClassDB::bind_method(D_METHOD("get_peers"), &MultiplayerAPI::get_peer_ids);
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ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "multiplayer_peer", PROPERTY_HINT_RESOURCE_TYPE, "MultiplayerPeer", PROPERTY_USAGE_NONE), "set_multiplayer_peer", "get_multiplayer_peer");
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ClassDB::bind_static_method("MultiplayerAPI", D_METHOD("set_default_interface", "interface_name"), &MultiplayerAPI::set_default_interface);
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ClassDB::bind_static_method("MultiplayerAPI", D_METHOD("get_default_interface"), &MultiplayerAPI::get_default_interface);
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ClassDB::bind_static_method("MultiplayerAPI", D_METHOD("create_default_interface"), &MultiplayerAPI::create_default_interface);
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ADD_SIGNAL(MethodInfo("peer_connected", PropertyInfo(Variant::INT, "id")));
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ADD_SIGNAL(MethodInfo("peer_disconnected", PropertyInfo(Variant::INT, "id")));
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ADD_SIGNAL(MethodInfo("connected_to_server"));
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ADD_SIGNAL(MethodInfo("connection_failed"));
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ADD_SIGNAL(MethodInfo("server_disconnected"));
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BIND_ENUM_CONSTANT(RPC_MODE_DISABLED);
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BIND_ENUM_CONSTANT(RPC_MODE_ANY_PEER);
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BIND_ENUM_CONSTANT(RPC_MODE_AUTHORITY);
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}
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/// MultiplayerAPIExtension
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Error MultiplayerAPIExtension::poll() {
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Error err = OK;
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GDVIRTUAL_CALL(_poll, err);
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return err;
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}
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void MultiplayerAPIExtension::set_multiplayer_peer(const Ref<MultiplayerPeer> &p_peer) {
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GDVIRTUAL_CALL(_set_multiplayer_peer, p_peer);
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}
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Ref<MultiplayerPeer> MultiplayerAPIExtension::get_multiplayer_peer() {
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Ref<MultiplayerPeer> peer;
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GDVIRTUAL_CALL(_get_multiplayer_peer, peer);
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return peer;
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}
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int MultiplayerAPIExtension::get_unique_id() {
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int id = 1;
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GDVIRTUAL_CALL(_get_unique_id, id);
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return id;
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}
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Vector<int> MultiplayerAPIExtension::get_peer_ids() {
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Vector<int> ids;
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GDVIRTUAL_CALL(_get_peer_ids, ids);
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return ids;
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}
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Error MultiplayerAPIExtension::rpcp(Object *p_obj, int p_peer_id, const StringName &p_method, const Variant **p_arg, int p_argcount) {
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if (!GDVIRTUAL_IS_OVERRIDDEN(_rpc)) {
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return ERR_UNAVAILABLE;
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}
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Array args;
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for (int i = 0; i < p_argcount; i++) {
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args.push_back(*p_arg[i]);
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}
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Error ret = FAILED;
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GDVIRTUAL_CALL(_rpc, p_peer_id, p_obj, p_method, args, ret);
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return ret;
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}
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int MultiplayerAPIExtension::get_remote_sender_id() {
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int id = 0;
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GDVIRTUAL_CALL(_get_remote_sender_id, id);
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return id;
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}
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Error MultiplayerAPIExtension::object_configuration_add(Object *p_object, Variant p_config) {
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Error err = ERR_UNAVAILABLE;
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GDVIRTUAL_CALL(_object_configuration_add, p_object, p_config, err);
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return err;
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}
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Error MultiplayerAPIExtension::object_configuration_remove(Object *p_object, Variant p_config) {
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Error err = ERR_UNAVAILABLE;
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GDVIRTUAL_CALL(_object_configuration_remove, p_object, p_config, err);
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return err;
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}
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void MultiplayerAPIExtension::_bind_methods() {
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GDVIRTUAL_BIND(_poll);
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GDVIRTUAL_BIND(_set_multiplayer_peer, "multiplayer_peer");
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GDVIRTUAL_BIND(_get_multiplayer_peer);
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GDVIRTUAL_BIND(_get_unique_id);
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GDVIRTUAL_BIND(_get_peer_ids);
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GDVIRTUAL_BIND(_rpc, "peer", "object", "method", "args");
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GDVIRTUAL_BIND(_get_remote_sender_id);
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GDVIRTUAL_BIND(_object_configuration_add, "object", "configuration");
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GDVIRTUAL_BIND(_object_configuration_remove, "object", "configuration");
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}
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