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/* ScummVM - Graphic Adventure Engine
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 * This program 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.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * $URL$
 * $Id$


#include "backends/graphics/opengl/gltexture.h"
#include "backends/graphics/graphics.h"
#include "common/array.h"
#include "common/events.h"
#include "graphics/pixelformat.h"

// Uncomment this to enable the 'on screen display' code.
#define USE_OSD   1

namespace OpenGL {
// The OpenGL GFX modes. They have to be inside the OpenGL namespace so they
// do not clash with the SDL GFX modes.
enum {
      GFX_NORMAL = 0,
      GFX_CONSERVE = 1,
      GFX_ORIGINAL = 2


 * OpenGL graphics manager. This is an abstract class, it does not do the
 * window and OpenGL context initialization.
 * Derived classes should at least override internUpdateScreen for doing
 * the buffers swap, and implement loadGFXMode for handling the window/context if
 * needed. If USE_RGB_COLOR is enabled, getSupportedFormats must be implemented.
00056 class OpenGLGraphicsManager : public GraphicsManager, public Common::EventObserver {
      virtual ~OpenGLGraphicsManager();

      virtual void initEventObserver();

      virtual bool hasFeature(OSystem::Feature f);
      virtual void setFeatureState(OSystem::Feature f, bool enable);
      virtual bool getFeatureState(OSystem::Feature f);

      static const OSystem::GraphicsMode *supportedGraphicsModes();
      virtual const OSystem::GraphicsMode *getSupportedGraphicsModes() const;
      virtual int getDefaultGraphicsMode() const;
      virtual bool setGraphicsMode(int mode);
      virtual int getGraphicsMode() const;
      virtual void resetGraphicsScale();
      virtual Graphics::PixelFormat getScreenFormat() const;
      virtual Common::List<Graphics::PixelFormat> getSupportedFormats() const = 0;
      virtual void initSize(uint width, uint height, const Graphics::PixelFormat *format = NULL);
      virtual int getScreenChangeID() const;

      virtual void beginGFXTransaction();
      virtual OSystem::TransactionError endGFXTransaction();

      virtual int16 getHeight();
      virtual int16 getWidth();
      // PaletteManager API
      virtual void setPalette(const byte *colors, uint start, uint num);
      virtual void grabPalette(byte *colors, uint start, uint num);

      virtual void copyRectToScreen(const byte *buf, int pitch, int x, int y, int w, int h);
      virtual Graphics::Surface *lockScreen();
      virtual void unlockScreen();
      virtual void fillScreen(uint32 col);
      virtual void updateScreen();
      virtual void setShakePos(int shakeOffset);
      virtual void setFocusRectangle(const Common::Rect &rect);
      virtual void clearFocusRectangle();

      virtual void showOverlay();
      virtual void hideOverlay();
      virtual Graphics::PixelFormat getOverlayFormat() const;
      virtual void clearOverlay();
      virtual void grabOverlay(OverlayColor *buf, int pitch);
      virtual void copyRectToOverlay(const OverlayColor *buf, int pitch, int x, int y, int w, int h);
      virtual int16 getOverlayHeight();
      virtual int16 getOverlayWidth();

      virtual bool showMouse(bool visible);
      virtual void warpMouse(int x, int y);
      virtual void setMouseCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, uint32 keycolor, int cursorTargetScale = 1, const Graphics::PixelFormat *format = NULL);
      virtual void setCursorPalette(const byte *colors, uint start, uint num);
      virtual void disableCursorPalette(bool disable);

      virtual void displayMessageOnOSD(const char *msg);

      // Override from Common::EventObserver
      bool notifyEvent(const Common::Event &event);

       * Setup OpenGL settings
      virtual void initGL();

       * Creates and refreshs OpenGL textures.
      virtual void loadTextures();

      // GFX and video
      enum {
            kTransactionNone = 0,
            kTransactionActive = 1,
            kTransactionRollback = 2

00140       struct TransactionDetails {
            bool sizeChanged;
            bool needRefresh;
            bool needUpdatescreen;
            bool filterChanged;
            bool formatChanged;
      TransactionDetails _transactionDetails;
      int _transactionMode;

00152       struct VideoState {
            bool setup;

            bool fullscreen;

            int mode;
            int scaleFactor;
            bool antialiasing;
            bool aspectRatioCorrection;

            int screenWidth, screenHeight;
            int overlayWidth, overlayHeight;
            int hardwareWidth, hardwareHeight;
            Graphics::PixelFormat format;
      VideoState _videoMode, _oldVideoMode;

       * Sets the OpenGL texture format for the given pixel format. If format is not support will raise an error.
      virtual void getGLPixelFormat(Graphics::PixelFormat pixelFormat, byte &bpp, GLenum &intFormat, GLenum &glFormat, GLenum &type);

      virtual void internUpdateScreen();
      virtual bool loadGFXMode();
      virtual void unloadGFXMode();

       * Setup the fullscreen mode state.
      void setFullscreenMode(bool enable);

       * Query the fullscreen state.
00188       inline bool getFullscreenMode() const { return _videoMode.fullscreen; }

       * Set the scale factor.
       * This can only be used in a GFX transaction.
       * @param newScale New scale factor.
      void setScale(int newScale);

       * Query the scale factor.
00202       inline int getScale() const { return _videoMode.scaleFactor; }

       * Toggle the antialiasing state of the current video mode.
       * This can only be used in a GFX transaction.
      void toggleAntialiasing();

       * Query the antialiasing state.
00214       inline bool getAntialiasingState() const { return _videoMode.antialiasing; }

      // Drawing coordinates for the current display mode and scale
      int _displayX;
      int _displayY;
      int _displayWidth;
      int _displayHeight;

      virtual const char *getCurrentModeName();

      virtual void calculateDisplaySize(int &width, int &height);
      virtual void refreshDisplaySize();

       * Returns the current target aspect ratio x 10000
      virtual uint getAspectRatio();

      bool _formatBGR;

      // Game screen
      GLTexture *_gameTexture;
      Graphics::Surface _screenData;
      int _screenChangeCount;
      bool _screenNeedsRedraw;
      Common::Rect _screenDirtyRect;

      Graphics::PixelFormat _screenFormat;
      byte *_gamePalette;

      virtual void refreshGameScreen();

      // Shake mode
      int _shakePos;

      // Overlay
      GLTexture *_overlayTexture;
      Graphics::Surface _overlayData;
      Graphics::PixelFormat _overlayFormat;
      bool _overlayVisible;
      bool _overlayNeedsRedraw;
      Common::Rect _overlayDirtyRect;

      virtual void refreshOverlay();

      // Mouse
00268       struct MousePos {
            // The mouse position in hardware screen coordinates.
            int16 x, y;

            // The size and hotspot of the original cursor image.
            int16 w, h;
            int16 hotX, hotY;

            // The size and hotspot of the scaled cursor, in real coordinates.
            int16 rW, rH;
            int16 rHotX, rHotY;

            // The size and hotspot of the scaled cursor, in game coordinates.
            int16 vW, vH;
            int16 vHotX, vHotY;

            MousePos() : x(0), y(0), w(0), h(0), hotX(0), hotY(0),
                              rW(0), rH(0), rHotX(0), rHotY(0), vW(0), vH(0),
                              vHotX(0), vHotY(0)      {}

      GLTexture *_cursorTexture;
      Graphics::Surface _cursorData;
      Graphics::PixelFormat _cursorFormat;
      byte *_cursorPalette;
      bool _cursorPaletteDisabled;
      MousePos _cursorState;
      bool _cursorVisible;
      uint32 _cursorKeyColor;
      int _cursorTargetScale;
      bool _cursorNeedsRedraw;

      virtual void refreshCursor();
      virtual void refreshCursorScale();

       * Set up the mouse position for the (event) system.
       * @param x X coordinate in native coordinates.
       * @param y Y coordinate in native coordinates.
      virtual void setInternalMousePosition(int x, int y) = 0;

       * Adjusts hardware screen coordinates to either overlay or game screen
       * coordinates depending on whether the overlay is visible or not.
       * @param x X coordinate of the mouse position.
       * @param y Y coordinate of the mouse position.
      virtual void adjustMousePosition(int16 &x, int16 &y);

      // Misc
      virtual bool saveScreenshot(const char *filename);

#ifdef USE_OSD
       * The OSD contents.
00329       Common::Array<Common::String> _osdLines;

       * Update the OSD texture / surface.
      void updateOSD();

      GLTexture *_osdTexture;
      Graphics::Surface _osdSurface;
      uint8 _osdAlpha;
      uint32 _osdFadeStartTime; 
      bool _requireOSDUpdate;
      enum {
            kOSDFadeOutDelay = 2 * 1000,
            kOSDFadeOutDuration = 500,
            kOSDInitialAlpha = 80


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