V9990PixelRenderer.cc

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#include "V9990PixelRenderer.hh"
#include "V9990.hh"
#include "V9990VRAM.hh"
#include "V9990DisplayTiming.hh"
#include "V9990Rasterizer.hh"
#include "PostProcessor.hh"
#include "Display.hh"
#include "VideoSystem.hh"
#include "VideoSourceSetting.hh"
#include "Event.hh"
#include "RealTime.hh"
#include "Timer.hh"
#include "EventDistributor.hh"
#include "MSXMotherBoard.hh"
#include "Reactor.hh"
#include "RenderSettings.hh"
#include "IntegerSetting.hh"
#include "one_of.hh"
#include "unreachable.hh"
#include <cassert>
 
namespace openmsx {
 
V9990PixelRenderer::V9990PixelRenderer(V9990& vdp_)
        : vdp(vdp_)
        , eventDistributor(vdp.getReactor().getEventDistributor())
        , realTime(vdp.getMotherBoard().getRealTime())
        , renderSettings(vdp.getReactor().getDisplay().getRenderSettings())
        , videoSourceSetting(vdp.getMotherBoard().getVideoSource())
        , rasterizer(vdp.getReactor().getDisplay().
                        getVideoSystem().createV9990Rasterizer(vdp))
{
        frameSkipCounter = 999; // force drawing of frame;
        finishFrameDuration = 0;
        drawFrame = false; // don't draw before frameStart is called
        prevDrawFrame = false;
 
        reset(vdp.getMotherBoard().getCurrentTime());
 
        renderSettings.getMaxFrameSkipSetting().attach(*this);
        renderSettings.getMinFrameSkipSetting().attach(*this);
}
 
V9990PixelRenderer::~V9990PixelRenderer()
{
        renderSettings.getMaxFrameSkipSetting().detach(*this);
        renderSettings.getMinFrameSkipSetting().detach(*this);
}
 
PostProcessor* V9990PixelRenderer::getPostProcessor() const
{
        return rasterizer->getPostProcessor();
}
 
void V9990PixelRenderer::reset(EmuTime::param time)
{
        displayEnabled = vdp.isDisplayEnabled();
        setDisplayMode(vdp.getDisplayMode(), time);
        setColorMode(vdp.getColorMode(), time);
 
        rasterizer->reset();
}
 
void V9990PixelRenderer::frameStart(EmuTime::param time)
{
        if (!rasterizer->isActive()) {
                frameSkipCounter = 999;
                drawFrame = false;
                prevDrawFrame = false;
                return;
        }
        prevDrawFrame = drawFrame;
        if (vdp.isInterlaced() && renderSettings.getDeinterlace() &&
            vdp.getEvenOdd() && vdp.isEvenOddEnabled()) {
                // deinterlaced odd frame, do same as even frame
        } else {
                if (frameSkipCounter < renderSettings.getMinFrameSkip()) {
                        ++frameSkipCounter;
                        drawFrame = false;
                } else if (frameSkipCounter >= renderSettings.getMaxFrameSkip()) {
                        frameSkipCounter = 0;
                        drawFrame = true;
                } else {
                        ++frameSkipCounter;
                        if (rasterizer->isRecording()) {
                                drawFrame = true;
                        } else {
                                drawFrame = realTime.timeLeft(
                                        unsigned(finishFrameDuration), time);
                        }
                        if (drawFrame) {
                                frameSkipCounter = 0;
                        }
                }
        }
        if (!drawFrame) return;
 
        accuracy = renderSettings.getAccuracy();
        lastX = 0;
        lastY = 0;
        verticalOffsetA = verticalOffsetB = vdp.getTopBorder();
 
        // Make sure that the correct timing is used
        setDisplayMode(vdp.getDisplayMode(), time);
        rasterizer->frameStart();
}
 
void V9990PixelRenderer::frameEnd(EmuTime::param time)
{
        bool skipEvent = !drawFrame;
        if (drawFrame) {
                // Render last changes in this frame before starting a new frame
                sync(time, true);
 
                auto time1 = Timer::getTime();
                rasterizer->frameEnd(time);
                auto time2 = Timer::getTime();
                auto current = time2 - time1;
                const float ALPHA = 0.2f;
                finishFrameDuration = finishFrameDuration * (1 - ALPHA) +
                                      current * ALPHA;
 
                if (vdp.isInterlaced() && vdp.isEvenOddEnabled() &&
                    renderSettings.getDeinterlace() &&
                    !prevDrawFrame) {
                        // dont send event in deinterlace mode when
                        // previous frame was not rendered
                        skipEvent = true;
                }
 
        }
        if (vdp.getMotherBoard().isActive() &&
            !vdp.getMotherBoard().isFastForwarding()) {
                eventDistributor.distributeEvent(
                        Event::create<FinishFrameEvent>(
                                rasterizer->getPostProcessor()->getVideoSource(),
                                videoSourceSetting.getSource(),
                                skipEvent));
        }
}
 
void V9990PixelRenderer::sync(EmuTime::param time, bool force)
{
        if (!drawFrame) return;
 
        if (accuracy != RenderSettings::ACC_SCREEN || force) {
                vdp.getVRAM().sync(time);
                renderUntil(time);
        }
}
 
void V9990PixelRenderer::renderUntil(EmuTime::param time)
{
        // Translate time to pixel position
        int limitTicks = vdp.getUCTicksThisFrame(time);
        assert(limitTicks <=
               V9990DisplayTiming::getUCTicksPerFrame(vdp.isPalTiming()));
        auto [toX, toY] = [&] {
                switch (accuracy) {
                case RenderSettings::ACC_PIXEL:
                        return std::pair{
                                limitTicks % V9990DisplayTiming::UC_TICKS_PER_LINE,
                                limitTicks / V9990DisplayTiming::UC_TICKS_PER_LINE
                        };
                case RenderSettings::ACC_LINE:
                case RenderSettings::ACC_SCREEN:
                        // TODO figure out rounding point
                        return std::pair{
                                0,
                                (limitTicks + V9990DisplayTiming::UC_TICKS_PER_LINE - 400) /
                                     V9990DisplayTiming::UC_TICKS_PER_LINE
                        };
                default:
                        UNREACHABLE;
                        return std::pair{0, 0}; // avoid warning
                }
        }();
 
        if ((toX == lastX) && (toY == lastY)) return;
 
        // edges of the DISPLAY part of the vdp output
        int left       = vdp.getLeftBorder();
        int right      = vdp.getRightBorder();
        int rightEdge  = V9990DisplayTiming::UC_TICKS_PER_LINE;
 
        if (displayEnabled) {
                // Left border
                subdivide(lastX, lastY, toX, toY, 0, left, DRAW_BORDER);
                // Display area
                //  It's possible this draws a few pixels too many (this
                //  allowed to simplify the implementation of the Bx modes).
                //  So it's important to draw from left to right (right border
                //  must come _after_ display area).
                subdivide(lastX, lastY, toX, toY, left, right, DRAW_DISPLAY);
                // Right border
                subdivide(lastX, lastY, toX, toY, right, rightEdge, DRAW_BORDER);
        } else {
                // complete screen
                subdivide(lastX, lastY, toX, toY, 0, rightEdge, DRAW_BORDER);
        }
 
        lastX = toX;
        lastY = toY;
}
 
void V9990PixelRenderer::subdivide(int fromX, int fromY, int toX, int toY,
                                   int clipL, int clipR, DrawType drawType)
{
        // partial first line
        if (fromX > clipL) {
                if (fromX < clipR) {
                        bool atEnd = (fromY != toY) || (toX >= clipR);
                        draw(fromX, fromY, (atEnd ? clipR : toX), fromY + 1,
                             drawType);
                }
                if (fromY == toY) return;
                fromY++;
        }
 
        bool drawLast = false;
        if (toX >= clipR) {
                toY++;
        } else if (toX > clipL) {
                drawLast = true;
        }
        // full middle lines
        if (fromY < toY) {
                draw(clipL, fromY, clipR, toY, drawType);
        }
 
        // partial last line
        if (drawLast) draw(clipL, toY, toX, toY + 1, drawType);
}
 
void V9990PixelRenderer::draw(int fromX, int fromY, int toX, int toY,
                              DrawType type)
{
        if (type == DRAW_BORDER) {
                rasterizer->drawBorder(fromX, fromY, toX, toY);
 
        } else {
                assert(type == DRAW_DISPLAY);
 
                int displayX  = fromX - vdp.getLeftBorder();
                int displayY  = fromY - vdp.getTopBorder();
                int displayYA = fromY - verticalOffsetA;
                int displayYB = fromY - verticalOffsetB;
 
                rasterizer->drawDisplay(fromX, fromY, toX, toY,
                                        displayX,
                                        displayY, displayYA, displayYB);
        }
}
 
void V9990PixelRenderer::updateDisplayEnabled(bool enabled, EmuTime::param time)
{
        sync(time, true);
        displayEnabled = enabled;
}
 
void V9990PixelRenderer::setDisplayMode(V9990DisplayMode mode, EmuTime::param time)
{
        sync(time);
        rasterizer->setDisplayMode(mode);
}
 
void V9990PixelRenderer::updatePalette(int index, byte r, byte g, byte b, bool ys,
                                       EmuTime::param time)
{
        if (displayEnabled) {
                sync(time);
        } else {
                // TODO only sync if border color changed
                sync(time);
        }
        rasterizer->setPalette(index, r, g, b, ys);
}
void V9990PixelRenderer::updateSuperimposing(bool enabled, EmuTime::param time)
{
        sync(time);
        rasterizer->setSuperimpose(enabled);
}
void V9990PixelRenderer::setColorMode(V9990ColorMode mode, EmuTime::param time)
{
        sync(time);
        rasterizer->setColorMode(mode);
}
 
void V9990PixelRenderer::updateBackgroundColor(int /*index*/, EmuTime::param time)
{
        sync(time);
}
 
void V9990PixelRenderer::updateScrollAX(EmuTime::param time)
{
        if (displayEnabled) sync(time);
}
void V9990PixelRenderer::updateScrollBX(EmuTime::param time)
{
        // TODO only in P1 mode
        if (displayEnabled) sync(time);
}
void V9990PixelRenderer::updateScrollAYLow(EmuTime::param time)
{
        if (displayEnabled) {
                sync(time);
                // happens in all display modes (verified)
                // TODO high byte still seems to be wrong .. need to investigate
                verticalOffsetA = lastY;
        }
}
void V9990PixelRenderer::updateScrollBYLow(EmuTime::param time)
{
        // TODO only in P1 mode
        if (displayEnabled) {
                sync(time);
                // happens in all display modes (verified)
                // TODO high byte still seems to be wrong .. need to investigate
                verticalOffsetB = lastY;
        }
}
 
void V9990PixelRenderer::update(const Setting& setting) noexcept
{
        assert(&setting == one_of(&renderSettings.getMinFrameSkipSetting(),
                                  &renderSettings.getMaxFrameSkipSetting()));
        (void)setting;
        // Force drawing of frame
        frameSkipCounter = 999;
}
 
} // namespace openmsx