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75 lines
2 KiB
C++
75 lines
2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* Additional copyright for this file:
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* Copyright (C) 1999-2000 Revolution Software Ltd.
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* This code is based on source code created by Revolution Software,
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* used with permission.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "engines/icb/common/px_common.h"
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#include "engines/icb/keyboard.h"
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namespace ICB {
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#define MAX_KEY_BUFFER 32
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uint8 keyBacklog = 0; // The number of key presses waiting to be processed.
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uint8 keyPointer = 0; // Index of the next key to read from the buffer.
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char keyBuffer[MAX_KEY_BUFFER]; // The keyboard buffer
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void WriteKey(char key) {
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if (keyBacklog < MAX_KEY_BUFFER) {
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keyBuffer[(keyPointer + keyBacklog) % MAX_KEY_BUFFER] = key;
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keyBacklog += 1;
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}
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}
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void Clear_key_buffer() {
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// clear all the backlog - we need this when we start using other methods (direct input) for reading keys
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keyBacklog = 0;
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keyPointer = 0;
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}
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bool KeyWaiting() {
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if (keyBacklog)
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return (true);
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else
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return (false);
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}
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int32 ReadKey(char *key) {
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if (!keyBacklog)
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return (0);
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if (key == nullptr)
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return 0;
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*key = keyBuffer[keyPointer++];
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if (keyPointer == MAX_KEY_BUFFER)
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keyPointer = 0;
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keyBacklog -= 1;
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return (1);
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}
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} // End of namespace ICB
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