CConsole.h

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/* Copyright (C) 2015 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Implements the in-game console with scripting support.
 */

#ifndef INCLUDED_CCONSOLE
#define INCLUDED_CCONSOLE

#include <stdarg.h>
#include <string>
#include <deque>
#include <map>

#include "graphics/ShaderProgramPtr.h"
#include "lib/file/vfs/vfs_path.h"
#include "lib/input.h"
#include "ps/CStr.h"
#include "ps/ThreadUtil.h"

class CTextRenderer;

#define CONSOLE_BUFFER_SIZE 1024 // for text being typed into the console
#define CONSOLE_MESSAGE_SIZE 1024 // for messages being printed into the console

#define CONSOLE_FONT "mono-10"

/**
 * In-game console.
 *
 * Thread-safety:
 * - Expected to be constructed/destructed in the main thread.
 * - InsertMessage may be called from any thread while the object is alive.
 */
class CConsole
{
    NONCOPYABLE(CConsole);

public:
    CConsole();
    ~CConsole();

    void SetSize(float X = 300, float Y = 0, float W = 800, float H = 600);
    void UpdateScreenSize(int w, int h);

    void ToggleVisible();
    void SetVisible(bool visible);

    void SetCursorBlinkRate(double rate);

    /**
     * @param deltaRealTime Elapsed real time since the last frame.
     */
    void Update(const float deltaRealTime);

    void Render();

    void InsertChar(const int szChar, const wchar_t cooked);

    void InsertMessage(const std::string& message);

    void SetBuffer(const wchar_t* szMessage);

    void UseHistoryFile(const VfsPath& filename, int historysize);

    // Only returns a pointer to the buffer; copy out of here if you want to keep it.
    const wchar_t* GetBuffer();
    void FlushBuffer();

    bool IsActive() { return m_bVisible; }

    int m_iFontHeight;
    int m_iFontWidth;
    int m_iFontOffset; // distance to move up before drawing
    size_t m_charsPerPage;

private:
    // Lock for all state modified by InsertMessage
    CMutex m_Mutex;

    float m_fX;
    float m_fY;

    float m_fHeight;
    float m_fWidth;

    // "position" in show/hide animation, how visible the console is (0..1).
    // allows implementing other animations than sliding, e.g. fading in/out.
    float m_fVisibleFrac;

    std::deque<std::wstring> m_deqMsgHistory; // protected by m_Mutex
    std::deque<std::wstring> m_deqBufHistory;

    int m_iMsgHistPos;

    wchar_t* m_szBuffer;
    int m_iBufferPos;
    int m_iBufferLength;

    VfsPath m_sHistoryFile;
    int m_MaxHistoryLines;

    bool m_bVisible;    // console is to be drawn
    bool m_bToggle;     // show/hide animation is currently active
    double m_prevTime;  // the previous time the cursor draw state changed (used for blinking cursor)
    bool m_bCursorVisState; // if the cursor should be drawn or not
    double m_cursorBlinkRate;   // cursor blink rate in seconds, if greater than 0.0

    void DrawWindow(CShaderProgramPtr& shader);
    void DrawHistory(CTextRenderer& textRenderer);
    void DrawBuffer(CTextRenderer& textRenderer);
    void DrawCursor(CTextRenderer& textRenderer);

    bool IsEOB() { return (m_iBufferPos == m_iBufferLength); } // Is end of Buffer?
    bool IsBOB() { return (m_iBufferPos == 0); } // Is beginning of Buffer?
    bool IsFull() { return (m_iBufferLength == CONSOLE_BUFFER_SIZE); }
    bool IsEmpty() { return (m_iBufferLength == 0); }

    void ProcessBuffer(const wchar_t* szLine);

    void LoadHistory();
    void SaveHistory();
};

extern CConsole* g_Console;

extern InReaction conInputHandler(const SDL_Event_* ev);

#endif