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
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef __DEV_PIXELPUMP_HH__
#define __DEV_PIXELPUMP_HH__
 
#include <vector>
 
#include "base/framebuffer.hh"
#include "sim/clocked_object.hh"
 
namespace gem5
{
 
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 size_t
    nextLine(std::vector<Pixel>::iterator ps, size_t line_length)
    {
        size_t count = 0;
        while (count < line_length && nextPixel(*ps++))
            count++;
        return count;
    }
 
    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;
};
 
} // namespace gem5
 
#endif // __DEV_PIXELPUMP_HH__