atari-graphics.h

/* 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 3 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
 * 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef BACKENDS_GRAPHICS_ATARI_H
#define BACKENDS_GRAPHICS_ATARI_H

#include "backends/graphics/graphics.h"
#include "common/events.h"

#include <mint/osbind.h>

#include "common/rect.h"
#include "graphics/surface.h"

#include "atari-cursor.h"
#include "atari-pendingscreenchanges.h"
#include "atari-screen.h"

#define MAX_HZ_SHAKE 16 // Falcon only
#define MAX_V_SHAKE  16

class AtariGraphicsManager : public GraphicsManager, Common::EventObserver {
    friend class Cursor;
    friend class PendingScreenChanges;
    friend class Screen;

public:
    AtariGraphicsManager();
    virtual ~AtariGraphicsManager();

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

    const OSystem::GraphicsMode *getSupportedGraphicsModes() const override {
        static const OSystem::GraphicsMode graphicsModes[] = {
            { "direct", "Direct rendering", kDirectRendering },
            { "single", "Single buffering", kSingleBuffering },
            { "triple", "Triple buffering", kTripleBuffering },
            { nullptr, nullptr, 0 }
        };
        return graphicsModes;
    }
    int getDefaultGraphicsMode() const override { return kTripleBuffering; }
    bool setGraphicsMode(int mode, uint flags = OSystem::kGfxModeNoFlags) override;
    int getGraphicsMode() const override { return _currentState.mode; }

    void initSize(uint width, uint height, const Graphics::PixelFormat *format = NULL) override;

    int getScreenChangeID() const override { return 0; }

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

    int16 getHeight() const override { return _currentState.height; }
    int16 getWidth() const override { return _currentState.width; }
    void setPalette(const byte *colors, uint start, uint num) override;
    void grabPalette(byte *colors, uint start, uint num) const override;
    void copyRectToScreen(const void *buf, int pitch, int x, int y, int w, int h) override;
    Graphics::Surface *lockScreen() override;
    void unlockScreen() override;
    void fillScreen(uint32 col) override;
    void fillScreen(const Common::Rect &r, uint32 col) override;
    void updateScreen() override;
    void setShakePos(int shakeXOffset, int shakeYOffset) override;
    void setFocusRectangle(const Common::Rect& rect) override {}
    void clearFocusRectangle() override {}

    void showOverlay(bool inGUI) override;
    void hideOverlay() override;
    bool isOverlayVisible() const override { return _overlayState == kOverlayVisible; }
    Graphics::PixelFormat getOverlayFormat() const override;
    void clearOverlay() override;
    void grabOverlay(Graphics::Surface &surface) const override;
    void copyRectToOverlay(const void *buf, int pitch, int x, int y, int w, int h) override;
    int16 getOverlayHeight() const override { return 480; }
    int16 getOverlayWidth() const override { return _vgaMonitor ? 640 : 640*1.2; }

    bool showMouse(bool visible) override;
    void warpMouse(int x, int y) override;
    void setMouseCursor(const void *buf, uint w, uint h, int hotspotX, int hotspotY, uint32 keycolor,
                        bool dontScale = false, const Graphics::PixelFormat *format = NULL, const byte *mask = NULL) override;
    void setCursorPalette(const byte *colors, uint start, uint num) override;

    Common::Point getMousePosition() const {
        if (isOverlayVisible()) {
            return _screen[kOverlayBuffer]->cursor.getPosition();
        } else {
            // kFrontBuffer is always up to date
            return _screen[kFrontBuffer]->cursor.getPosition();
        }
    }
    void updateMousePosition(int deltaX, int deltaY);

    bool notifyEvent(const Common::Event &event) override;
    Common::Keymap *getKeymap() const;

protected:
    typedef void* (*AtariMemAlloc)(size_t bytes);
    typedef void (*AtariMemFree)(void *ptr);

    void allocateSurfaces();
    void freeSurfaces();

private:
    enum {
        kUnknownMode        = -1,
        kDirectRendering    = 0,
        kSingleBuffering    = 1,
        kTripleBuffering    = 3
    };

    enum CustomEventAction {
        kActionToggleAspectRatioCorrection = 100,
    };

#ifndef DISABLE_FANCY_THEMES
    int16 getMaximumScreenHeight() const { return 480; }
    int16 getMaximumScreenWidth() const { return _tt ? 320 : (_vgaMonitor ? 640 : 640*1.2); }
#else
    int16 getMaximumScreenHeight() const { return _tt ? 480 : 240; }
    int16 getMaximumScreenWidth() const { return _tt ? 320 : (_vgaMonitor ? 320 : 320*1.2); }
#endif

    void unlockScreenInternal(const Graphics::Surface &dstSurface,
                              int x, int y, int w, int h);
    bool updateScreenInternal(Screen *dstScreen, const Graphics::Surface &srcSurface);
    void copyRectToScreenInternal(Graphics::Surface &dstSurface,
                                  const void *buf, int pitch, int x, int y, int w, int h,
                                  const Graphics::PixelFormat &format, bool directRendering);

    int getBitsPerPixel(const Graphics::PixelFormat &format) const;

    bool isOverlayDirectRendering() const;

    virtual AtariMemAlloc getStRamAllocFunc() const {
        return [](size_t bytes) { return (void*)Mxalloc(bytes, MX_STRAM); };
    }
    virtual AtariMemFree getStRamFreeFunc() const {
        return [](void *ptr) { Mfree(ptr); };
    }

    virtual void copyRectToSurface(Graphics::Surface &dstSurface, int dstBitsPerPixel, const Graphics::Surface &srcSurface,
                                   int destX, int destY,
                                   const Common::Rect &subRect) const {
        dstSurface.copyRectToSurface(srcSurface, destX, destY, subRect);
    }

    virtual void drawMaskedSprite(Graphics::Surface &dstSurface, int dstBitsPerPixel,
                                  const Graphics::Surface &srcSurface, const Graphics::Surface &srcMask,
                                  int destX, int destY,
                                  const Common::Rect &subRect) = 0;

    virtual Common::Rect alignRect(int x, int y, int w, int h) const = 0;

    Common::Rect alignRect(const Common::Rect &rect) const {
        return alignRect(rect.left, rect.top, rect.width(), rect.height());
    }

    bool _vgaMonitor = true;
    bool _tt = false;
    bool _checkUnalignedPitch = false;

    struct GraphicsState {
        GraphicsState()
            : inTransaction(false)
            , mode(kUnknownMode)
            , width(0)
            , height(0)
            , format(Graphics::PixelFormat()) {
        }

        bool isValid() const {
            return mode != kUnknownMode && width > 0 && height > 0 && format.bytesPerPixel != 0;
        }

        bool inTransaction;
        int mode;
        int width;
        int height;
        Graphics::PixelFormat format;
    };
    GraphicsState _pendingState;
    GraphicsState _currentState;

    // feature flags
    bool _aspectRatioCorrection = false;

    PendingScreenChanges _pendingScreenChanges;

    enum {
        kFrontBuffer    = 0,
        kBackBuffer1    = 1,
        kBackBuffer2    = 2,
        kOverlayBuffer  = 3,
        kBufferCount
    };
    Screen *_screen[kBufferCount] = {};

    Graphics::Surface _chunkySurface;

    enum {
        kOverlayVisible,
        kOverlayIgnoredHide,
        kOverlayHidden
    };
    int _overlayState = kOverlayHidden;
    bool _ignoreHideOverlay = true;
    Graphics::Surface _overlaySurface;

    Palette _palette;
    Palette _overlayPalette;
};

#endif