pixelpump.hh

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/*
 * Copyright (c) 2015, 2017 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
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 * redistributions in binary form must reproduce the above copyright
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 * this software without specific prior written permission.
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#ifndef __DEV_PIXELPUMP_HH__
#define __DEV_PIXELPUMP_HH__

#include "base/framebuffer.hh"
#include "sim/clocked_object.hh"

struct BasePixelPumpParams;

struct DisplayTimings : public Serializable
{
    DisplayTimings(unsigned width, unsigned height,
                   unsigned hbp, unsigned h_sync, unsigned hfp,
                   unsigned vbp, unsigned v_sync, unsigned vfp);

    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;

    Cycles cyclesPerLine() const {
        return Cycles(hSync + hBackPorch +  width + hBackPorch);
    }

    Cycles cyclesPerFrame() const {
        return Cycles(cyclesPerLine() * linesPerFrame());
    }

    unsigned lineVSyncStart() const {
        return 0;
    }

    unsigned lineVBackPorchStart() const {
        return lineVSyncStart() + vSync;
    }

    unsigned lineFirstVisible() const {
        return lineVBackPorchStart() + vBackPorch;
    }

    unsigned lineFrontPorchStart() const {
        return lineFirstVisible() + height;
    }

    unsigned linesPerFrame() const {
        return lineFrontPorchStart() + vFrontPorch;
    }

    unsigned width;
    unsigned height;

    unsigned hBackPorch;
    unsigned hFrontPorch;
    unsigned hSync;

    unsigned vBackPorch;
    unsigned vFrontPorch;
    unsigned vSync;

    static const DisplayTimings vga;
};

class BasePixelPump
    : public EventManager, public Clocked,
      public Serializable
{
  public:
    BasePixelPump(EventManager &em, ClockDomain &pxl_clk,
                  unsigned pixel_chunk);
    virtual ~BasePixelPump();

    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;

  public: // Public API
    void updateTimings(const DisplayTimings &timings);

    void renderFrame();

    void start();

    void stop();

    const DisplayTimings &timings() const { return _timings; }

    bool active() const { return evBeginLine.active(); }

    bool underrun() const { return _underrun; }

    bool visibleLine() const {
        return line >= _timings.lineFirstVisible() &&
            line < _timings.lineFrontPorchStart();
    }

    unsigned posX() const { return _posX; }

    unsigned posY() const {
        return visibleLine() ? line - _timings.lineFirstVisible() : 0;
    }

    FrameBuffer fb;

  protected: // Callbacks
    virtual bool nextPixel(Pixel &p) = 0;

    virtual void onVSyncBegin() {};

    virtual void onVSyncEnd() {};

    virtual void onHSyncBegin() {};

    virtual void onHSyncEnd() {};

    virtual void onUnderrun(unsigned x, unsigned y) {};

    virtual void onFrameDone() {};

  private: // Params
    const unsigned pixelChunk;

  private:
    class PixelEvent : public Event, public Drainable
    {
        typedef void (BasePixelPump::* CallbackType)();

      public:
        PixelEvent(const char *name, BasePixelPump *parent, CallbackType func);

        DrainState drain() override;
        void drainResume() override;

        void serialize(CheckpointOut &cp) const override;
        void unserialize(CheckpointIn &cp) override;

        const std::string name() const override { return _name; }
        void process() override {
            (parent.*func)();
        }

        bool active() const { return scheduled() || suspended; }

      private:
        void suspend();
        void resume();

        const std::string _name;
        BasePixelPump &parent;
        const CallbackType func;

        bool suspended;
        Tick relativeTick;
    };

    void beginLine();
    void renderPixels();

    void renderLine();

    std::vector<PixelEvent *> pixelEvents;

    PixelEvent evVSyncBegin;
    PixelEvent evVSyncEnd;
    PixelEvent evHSyncBegin;
    PixelEvent evHSyncEnd;
    PixelEvent evBeginLine;
    PixelEvent evRenderPixels;

    DisplayTimings _timings;

    unsigned line;
    unsigned _posX;

    bool _underrun;
};

#endif // __DEV_PIXELPUMP_HH__