V9990SDLRasterizer.cc

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#include "V9990SDLRasterizer.hh"
#include "V9990.hh"
#include "RawFrame.hh"
#include "PostProcessor.hh"
#include "Display.hh"
#include "OutputSurface.hh"
#include "RenderSettings.hh"
#include "enumerate.hh"
#include "narrow.hh"
#include "one_of.hh"
#include "ranges.hh"
#include "xrange.hh"
#include <algorithm>
#include <array>
#include <cstdint>
#include <memory>
 
namespace openmsx {
 
V9990SDLRasterizer::V9990SDLRasterizer(
                V9990& vdp_, Display& display, OutputSurface& screen_,
                std::unique_ptr<PostProcessor> postProcessor_)
        : vdp(vdp_), vram(vdp.getVRAM())
        , screen(screen_)
        , workFrame(std::make_unique<RawFrame>(1280, 240))
        , renderSettings(display.getRenderSettings())
        , postProcessor(std::move(postProcessor_))
        , bitmapConverter(vdp, palette64, palette64_32768, palette256, palette256_32768, palette32768)
        , p1Converter(vdp, palette64)
        , p2Converter(vdp, palette64)
{
        // Fill palettes
        preCalcPalettes();
 
        renderSettings.getGammaSetting()      .attach(*this);
        renderSettings.getBrightnessSetting() .attach(*this);
        renderSettings.getContrastSetting()   .attach(*this);
        renderSettings.getColorMatrixSetting().attach(*this);
}
 
V9990SDLRasterizer::~V9990SDLRasterizer()
{
        renderSettings.getColorMatrixSetting().detach(*this);
        renderSettings.getGammaSetting()      .detach(*this);
        renderSettings.getBrightnessSetting() .detach(*this);
        renderSettings.getContrastSetting()   .detach(*this);
}
 
PostProcessor* V9990SDLRasterizer::getPostProcessor() const
{
        return postProcessor.get();
}
 
bool V9990SDLRasterizer::isActive()
{
        return postProcessor->needRender() &&
               vdp.getMotherBoard().isActive() &&
               !vdp.getMotherBoard().isFastForwarding();
}
 
void V9990SDLRasterizer::reset()
{
        setDisplayMode(vdp.getDisplayMode());
        setColorMode(vdp.getColorMode());
        resetPalette();
}
 
void V9990SDLRasterizer::frameStart()
{
        const V9990DisplayPeriod& horTiming = vdp.getHorizontalTiming();
        const V9990DisplayPeriod& verTiming = vdp.getVerticalTiming();
 
        // Center image on the window.
 
        // In SDLLo, one window pixel represents 8 UC clock ticks, so the
        // window = 320 * 8 UC ticks wide. In SDLHi, one pixel is 4 clock-
        // ticks and the window 640 pixels wide -- same amount of UC ticks.
        colZero = horTiming.blank + horTiming.border1 +
                  (horTiming.display - SCREEN_WIDTH * 8) / 2;
 
        // 240 display lines can be shown. In SDLHi, we can do interlace,
        // but still 240 lines per frame.
        lineRenderTop = verTiming.blank + verTiming.border1 +
                        (verTiming.display - SCREEN_HEIGHT) / 2;
}
 
void V9990SDLRasterizer::frameEnd(EmuTime::param time)
{
        workFrame = postProcessor->rotateFrames(std::move(workFrame), time);
        workFrame->init(
            vdp.isInterlaced() ? (vdp.getEvenOdd() ? RawFrame::FieldType::EVEN
                                                   : RawFrame::FieldType::ODD)
                               : RawFrame::FieldType::NONINTERLACED);
}
 
void V9990SDLRasterizer::setDisplayMode(V9990DisplayMode mode)
{
        displayMode = mode;
        bitmapConverter.setColorMode(colorMode, displayMode);
}
 
void V9990SDLRasterizer::setColorMode(V9990ColorMode mode)
{
        colorMode = mode;
        bitmapConverter.setColorMode(colorMode, displayMode);
}
 
void V9990SDLRasterizer::drawBorder(
        int fromX, int fromY, int limitX, int limitY)
{
        Pixel bgColor = vdp.isOverScan()
                      ? 0
                      : palette64[vdp.getBackDropColor() & 63];
 
        int startY = std::max(fromY  - lineRenderTop,   0);
        int endY   = std::min(limitY - lineRenderTop, 240);
        if (startY >= endY) return;
 
        if ((fromX == 0) && (limitX == V9990DisplayTiming::UC_TICKS_PER_LINE)) {
                // optimization
                for (auto y : xrange(startY, endY)) {
                        workFrame->setBlank(y, bgColor);
                }
                return;
        }
 
        static int const screenW = SCREEN_WIDTH * 8; // in ticks
        int startX = std::max(0, V9990::UCtoX(fromX - colZero, displayMode));
        int endX = V9990::UCtoX(
                (limitX == V9990DisplayTiming::UC_TICKS_PER_LINE)
                ? screenW : std::min(screenW, limitX - colZero), displayMode);
        if (startX >= endX) return;
 
        unsigned lineWidth = vdp.getLineWidth();
        for (auto y : xrange(startY, endY)) {
                ranges::fill(workFrame->getLineDirect(y).subspan(startX, size_t(endX - startX)),
                             bgColor);
                workFrame->setLineWidth(y, lineWidth);
        }
}
 
void V9990SDLRasterizer::drawDisplay(
        int fromX, int fromY, int toX, int toY,
        int displayX, int displayY, int displayYA, int displayYB)
{
        static int const screenW = SCREEN_WIDTH * 8;
        static int const screenH = SCREEN_HEIGHT;
 
        // from VDP coordinates to screen coordinates
        fromX -= colZero;
        toX   -= colZero;
        fromY -= lineRenderTop;
        toY   -= lineRenderTop;
 
        // Clip to screen
        if (fromX < 0) {
                displayX -= fromX;
                fromX = 0;
        }
        if (fromY < 0) {
                displayY  -= fromY;
                displayYA -= fromY;
                displayYB -= fromY;
                fromY = 0;
        }
        if (toX > screenW) {
                toX = screenW;
        }
        if (toY > screenH) {
                toY = screenH;
        }
        fromX = V9990::UCtoX(fromX, displayMode);
        toX   = V9990::UCtoX(toX,   displayMode);
 
        if ((toX > fromX) && (toY > fromY)) {
                bool drawSprites = vdp.spritesEnabled() &&
                        !renderSettings.getDisableSprites();
 
                displayX = V9990::UCtoX(displayX, displayMode);
                int displayWidth  = toX - fromX;
                int displayHeight = toY - fromY;
 
                if (displayMode == V9990DisplayMode::P1) {
                        drawP1Mode(fromX, fromY, displayX,
                                   displayY, displayYA, displayYB,
                                   displayWidth, displayHeight,
                                   drawSprites);
                } else if (displayMode == V9990DisplayMode::P2) {
                        drawP2Mode(fromX, fromY, displayX,
                                   displayY, displayYA,
                                   displayWidth, displayHeight,
                                   drawSprites);
                } else {
                        drawBxMode(fromX, fromY, displayX,
                                   displayY, displayYA,
                                   displayWidth, displayHeight,
                                   drawSprites);
                }
        }
}
 
void V9990SDLRasterizer::drawP1Mode(
        int fromX, int fromY, int displayX,
        int displayY, int displayYA, int displayYB,
        int displayWidth, int displayHeight, bool drawSprites)
{
        while (displayHeight--) {
                auto dst = workFrame->getLineDirect(fromY).subspan(fromX, displayWidth);
                p1Converter.convertLine(dst, displayX, displayY,
                                        displayYA, displayYB, drawSprites);
                workFrame->setLineWidth(fromY, 320);
                ++fromY;
                ++displayY;
                ++displayYA;
                ++displayYB;
        }
}
 
void V9990SDLRasterizer::drawP2Mode(
        int fromX, int fromY, int displayX, int displayY, int displayYA,
        int displayWidth, int displayHeight, bool drawSprites)
{
        while (displayHeight--) {
                auto dst = workFrame->getLineDirect(fromY).subspan(fromX, displayWidth);
                p2Converter.convertLine(dst, displayX, displayY, displayYA, drawSprites);
                workFrame->setLineWidth(fromY, 640);
                ++fromY;
                ++displayY;
                ++displayYA;
        }
}
 
void V9990SDLRasterizer::drawBxMode(
        int fromX, int fromY, int displayX, int displayY, int displayYA,
        int displayWidth, int displayHeight, bool drawSprites)
{
        unsigned scrollX = vdp.getScrollAX();
        unsigned x = displayX + scrollX;
 
        int lineStep = 1;
        if (vdp.isEvenOddEnabled()) {
                displayYA *= 2;
                if (vdp.getEvenOdd()) {
                        ++displayY;
                        ++displayYA;
                }
                lineStep = 2;
        }
 
        unsigned scrollY = vdp.getScrollAY();
        unsigned rollMask = vdp.getRollMask(0x1FFF);
        unsigned scrollYBase = scrollY & ~rollMask & 0x1FFF;
        int cursorY = displayY - vdp.getCursorYOffset();
        while (displayHeight--) {
                // Note: convertLine() can draw up to 3 pixels too many. But
                // that's ok, the buffer is big enough: buffer can hold 1280
                // pixels, max displayWidth is 1024 pixels. When taking the
                // position of the borders into account, the display area
                // plus 3 pixels cannot go beyond the end of the buffer.
                unsigned y = scrollYBase + ((displayYA + scrollY) & rollMask);
                auto dst = workFrame->getLineDirect(fromY).subspan(fromX, displayWidth);
                bitmapConverter.convertLine(dst, x, y, cursorY, drawSprites);
                workFrame->setLineWidth(fromY, vdp.getLineWidth());
                ++fromY;
                displayYA += lineStep;
                cursorY   += lineStep;
        }
}
 
 
void V9990SDLRasterizer::preCalcPalettes()
{
        // the 32768 color palette
        if (renderSettings.isColorMatrixIdentity()) {
                // Most users use the "normal" monitor type; making this a
                // special case speeds up palette precalculation a lot.
                std::array<int, 32> intensity;
                for (auto [i, r] : enumerate(intensity)) {
                        r = narrow_cast<int>(255.0f * renderSettings.transformComponent(narrow<float>(i) * (1.0f / 31.0f)));
                }
                for (auto [grb, col] : enumerate(palette32768)) {
                        col = screen.mapRGB255(gl::ivec3(
                                intensity[(grb >>  5) & 31],
                                intensity[(grb >> 10) & 31],
                                intensity[(grb >>  0) & 31]));
                }
        } else {
                for (auto g : xrange(32)) {
                        for (auto r : xrange(32)) {
                                for (auto b : xrange(32)) {
                                        gl::vec3 rgb{narrow<float>(r),
                                                     narrow<float>(g),
                                                     narrow<float>(b)};
                                        palette32768[(g << 10) + (r << 5) + b] = Pixel(
                                                screen.mapRGB(renderSettings.transformRGB(rgb * (1.0f / 31.0f))));
                                }
                        }
                }
        }
 
        // the 256 color palette
        std::array<int, 8> mapRG = {0, 4, 9, 13, 18, 22, 27, 31};
        std::array<int, 4> mapB = {0, 11, 21, 31};
        for (auto g : xrange(8)) {
                for (auto r : xrange(8)) {
                        for (auto b : xrange(4)) {
                                auto idx256 = (g << 5) | (r << 2) | b;
                                auto idx32768 = (mapRG[g] << 10) | (mapRG[r] << 5) | mapB[b];
                                palette256_32768[idx256] = narrow<int16_t>(idx32768);
                                palette256[idx256] = palette32768[idx32768];
                        }
                }
        }
 
        resetPalette();
}
 
void V9990SDLRasterizer::setPalette(int index,
                                           byte r, byte g, byte b, bool ys)
{
        auto idx32768 = ((g & 31) << 10) | ((r & 31) << 5) | ((b & 31) << 0);
        palette64_32768[index & 63] = narrow<int16_t>(idx32768); // TODO what with ys?
        palette64[index & 63] = ys ? screen.getKeyColor()
                                   : palette32768[idx32768];
}
 
void V9990SDLRasterizer::resetPalette()
{
        // get 64 color palette from VDP
        for (auto i : xrange(64)) {
                auto [r, g, b, ys] = vdp.getPalette(i);
                setPalette(i, r, g, b, ys);
        }
        palette256[0] = vdp.isSuperimposing() ? screen.getKeyColor()
                                              : palette32768[0];
        // TODO what with palette256_32768[0]?
}
 
void V9990SDLRasterizer::setSuperimpose(bool /*enabled*/)
{
        resetPalette();
}
 
bool V9990SDLRasterizer::isRecording() const
{
        return postProcessor->isRecording();
}
 
void V9990SDLRasterizer::update(const Setting& setting) noexcept
{
        if (&setting == one_of(&renderSettings.getGammaSetting(),
                               &renderSettings.getBrightnessSetting(),
                               &renderSettings.getContrastSetting(),
                               &renderSettings.getColorMatrixSetting())) {
                preCalcPalettes();
        }
}
 
} // namespace openmsx