mirror of https://github.com/stella-emu/stella.git
384 lines
11 KiB
C++
384 lines
11 KiB
C++
//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2017 by Bradford W. Mott, Stephen Anthony
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// and the Stella Team
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//
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// See the file "License.txt" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//============================================================================
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#include <cmath>
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#include "FrameBuffer.hxx"
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#include "Settings.hxx"
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#include "OSystem.hxx"
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#include "Console.hxx"
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#include "TIA.hxx"
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#include "TIASurface.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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TIASurface::TIASurface(OSystem& system)
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: myOSystem(system),
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myFB(system.frameBuffer()),
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myTIA(nullptr),
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myFilterType(kNormal),
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myUsePhosphor(false),
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myPhosphorPercent(0.77),
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myScanlinesEnabled(false),
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myPalette(nullptr)
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{
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// Load NTSC filter settings
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myNTSCFilter.loadConfig(myOSystem.settings());
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// Create a surface for the TIA image and scanlines; we'll need them eventually
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myTiaSurface = myFB.allocateSurface(ATARI_NTSC_OUT_WIDTH(kTIAW), kTIAH);
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// Generate scanline data, and a pre-defined scanline surface
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uInt32 scanData[kScanH];
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for(int i = 0; i < kScanH; i+=2)
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{
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scanData[i] = 0x00000000;
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scanData[i+1] = 0xff000000;
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}
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mySLineSurface = myFB.allocateSurface(1, kScanH, scanData);
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// Base TIA surface for use in taking snapshots in 1x mode
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myBaseTiaSurface = myFB.allocateSurface(kTIAW*2, kTIAH);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::initialize(const Console& console, const VideoMode& mode)
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{
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myTIA = &(console.tia());
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myTiaSurface->setDstPos(mode.image.x(), mode.image.y());
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myTiaSurface->setDstSize(mode.image.width(), mode.image.height());
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mySLineSurface->setDstPos(mode.image.x(), mode.image.y());
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mySLineSurface->setDstSize(mode.image.width(), mode.image.height());
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bool p_enable = console.properties().get(Display_Phosphor) == "YES";
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int p_blend = atoi(console.properties().get(Display_PPBlend).c_str());
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enablePhosphor(p_enable, p_blend);
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setNTSC(NTSCFilter::Preset(myOSystem.settings().getInt("tv.filter")), false);
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// Scanline repeating is sensitive to non-integral vertical resolution,
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// so rounding is performed to eliminate it
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// This won't be 100% accurate, but non-integral scaling isn't 100%
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// accurate anyway
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mySLineSurface->setSrcSize(1, int(2 * float(mode.image.height()) /
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floor((float(mode.image.height()) / myTIA->height()) + 0.5)));
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#if 0
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cerr << "INITIALIZE:\n"
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<< "TIA:\n"
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<< "src: " << myTiaSurface->srcRect() << endl
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<< "dst: " << myTiaSurface->dstRect() << endl
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<< endl;
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cerr << "SLine:\n"
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<< "src: " << mySLineSurface->srcRect() << endl
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<< "dst: " << mySLineSurface->dstRect() << endl
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<< endl;
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#endif
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::setPalette(const uInt32* tia_palette, const uInt32* rgb_palette)
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{
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myPalette = tia_palette;
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// The NTSC filtering needs access to the raw RGB data, since it calculates
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// its own internal palette
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myNTSCFilter.setTIAPalette(*this, rgb_palette);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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const FBSurface& TIASurface::baseSurface(GUI::Rect& rect) const
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{
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uInt32 tiaw = myTIA->width(), width = tiaw*2, height = myTIA->height();
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rect.setBounds(0, 0, width, height);
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// Fill the surface with pixels from the TIA, scaled 2x horizontally
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uInt32 *buf_ptr, pitch;
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myBaseTiaSurface->basePtr(buf_ptr, pitch);
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for(uInt32 y = 0; y < height; ++y)
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{
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for(uInt32 x = 0; x < tiaw; ++x)
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{
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uInt32 pixel = myFB.tiaSurface().pixel(y*tiaw+x);
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*buf_ptr++ = pixel;
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*buf_ptr++ = pixel;
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}
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}
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return *myBaseTiaSurface;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt32 TIASurface::pixel(uInt32 idx, uInt8 shift) const
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{
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uInt8 c = *(myTIA->frameBuffer() + idx) | shift;
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if(!myUsePhosphor)
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return myPalette[c];
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else
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{
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const uInt32 p = *(myTIA->rgbFramebuffer() + idx);
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// Mix current calculated frame with previous displayed frame
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const uInt32 retVal = getRGBPhosphor(myPalette[c], p, shift);
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// Store back into displayed frame buffer (for next frame)
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*(myTIA->rgbFramebuffer() + idx) = retVal;
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return retVal;
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::setNTSC(NTSCFilter::Preset preset, bool show)
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{
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ostringstream buf;
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if(preset == NTSCFilter::PRESET_OFF)
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{
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enableNTSC(false);
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buf << "TV filtering disabled";
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}
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else
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{
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enableNTSC(true);
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const string& mode = myNTSCFilter.setPreset(preset);
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buf << "TV filtering (" << mode << " mode)";
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}
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myOSystem.settings().setValue("tv.filter", int(preset));
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if(show) myFB.showMessage(buf.str());
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::setScanlineIntensity(int amount)
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{
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ostringstream buf;
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if(ntscEnabled())
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{
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uInt32 intensity = enableScanlines(amount);
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buf << "Scanline intensity at " << intensity << "%";
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myOSystem.settings().setValue("tv.scanlines", intensity);
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}
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else
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buf << "Scanlines only available in TV filtering mode";
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myFB.showMessage(buf.str());
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::toggleScanlineInterpolation()
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{
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ostringstream buf;
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if(ntscEnabled())
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{
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bool enable = !myOSystem.settings().getBool("tv.scaninter");
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enableScanlineInterpolation(enable);
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buf << "Scanline interpolation " << (enable ? "enabled" : "disabled");
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myOSystem.settings().setValue("tv.scaninter", enable);
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}
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else
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buf << "Scanlines only available in TV filtering mode";
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myFB.showMessage(buf.str());
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt32 TIASurface::enableScanlines(int relative, int absolute)
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{
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FBSurface::Attributes& attr = mySLineSurface->attributes();
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if(relative == 0) attr.blendalpha = absolute;
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else attr.blendalpha += relative;
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attr.blendalpha = std::min(100u, attr.blendalpha);
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mySLineSurface->applyAttributes();
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mySLineSurface->setDirty();
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return attr.blendalpha;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::enableScanlineInterpolation(bool enable)
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{
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FBSurface::Attributes& attr = mySLineSurface->attributes();
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attr.smoothing = enable;
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mySLineSurface->applyAttributes();
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mySLineSurface->setDirty();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::enablePhosphor(bool enable, int blend)
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{
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myUsePhosphor = enable;
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myPhosphorPercent = blend / 100.0;
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myFilterType = FilterType(enable ? myFilterType | 0x01 : myFilterType & 0x10);
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myTiaSurface->setDirty();
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mySLineSurface->setDirty();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt32 TIASurface::getRGBPhosphor(uInt32 c, uInt32 p, uInt8 shift) const
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{
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uInt8 rc, gc, bc, rp, gp, bp;
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myFB.getRGB(c, &rc, &gc, &bc);
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myFB.getRGB(p, &rp, &gp, &bp);
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// mix current calculated frame with previous displayed frame
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uInt8 rn = getPhosphor(rc, rp);
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uInt8 gn = getPhosphor(gc, gp);
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uInt8 bn = getPhosphor(bc, bp);
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if(shift)
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{
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// convert RGB to grayscale
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rn = gn = bn = (uInt8)(0.2126*rn + 0.7152*gn + 0.0722*bn);
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}
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return myFB.mapRGB(rn, gn, bn);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::enableNTSC(bool enable)
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{
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myFilterType = FilterType(enable ? myFilterType | 0x10 : myFilterType & 0x01);
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// Normal vs NTSC mode uses different source widths
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myTiaSurface->setSrcSize(enable ? ATARI_NTSC_OUT_WIDTH(160) : 160, myTIA->height());
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FBSurface::Attributes& tia_attr = myTiaSurface->attributes();
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tia_attr.smoothing = myOSystem.settings().getBool("tia.inter");
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myTiaSurface->applyAttributes();
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myScanlinesEnabled = enable;
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FBSurface::Attributes& sl_attr = mySLineSurface->attributes();
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sl_attr.smoothing = myOSystem.settings().getBool("tv.scaninter");
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sl_attr.blending = myScanlinesEnabled;
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sl_attr.blendalpha = myOSystem.settings().getInt("tv.scanlines");
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mySLineSurface->applyAttributes();
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myTiaSurface->setDirty();
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mySLineSurface->setDirty();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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string TIASurface::effectsInfo() const
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{
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const FBSurface::Attributes& attr = mySLineSurface->attributes();
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ostringstream buf;
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switch(myFilterType)
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{
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case kNormal:
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buf << "Disabled, normal mode";
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break;
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case kPhosphor:
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buf << "Disabled, phosphor mode";
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break;
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case kBlarggNormal:
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buf << myNTSCFilter.getPreset() << ", scanlines=" << attr.blendalpha << "/"
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<< (attr.smoothing ? "inter" : "nointer");
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break;
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case kBlarggPhosphor:
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buf << myNTSCFilter.getPreset() << ", phosphor, scanlines="
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<< attr.blendalpha << "/" << (attr.smoothing ? "inter" : "nointer");
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break;
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}
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return buf.str();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void TIASurface::render()
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{
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// Copy the mediasource framebuffer to the RGB texture
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// In hardware rendering mode, it's faster to just assume that the screen
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// is dirty and always do an update
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uInt8* tiaFrame = myTIA->frameBuffer();
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uInt32* rgbFrame = myTIA->rgbFramebuffer();
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uInt32 width = myTIA->width();
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uInt32 height = myTIA->height();
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uInt32 *buffer, pitch;
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myTiaSurface->basePtr(buffer, pitch);
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switch(myFilterType)
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{
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case kNormal:
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{
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uInt32 bufofsY = 0;
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uInt32 screenofsY = 0;
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for(uInt32 y = 0; y < height; ++y)
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{
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uInt32 pos = screenofsY;
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for(uInt32 x = 0; x < width; ++x)
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buffer[pos++] = myPalette[tiaFrame[bufofsY + x]];
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bufofsY += width;
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screenofsY += pitch;
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}
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break;
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}
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case kPhosphor:
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{
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uInt32 bufofsY = 0;
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uInt32 screenofsY = 0;
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for(uInt32 y = 0; y < height; ++y)
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{
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uInt32 pos = screenofsY;
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for(uInt32 x = 0; x < width; ++x)
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{
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const uInt32 bufofs = bufofsY + x;
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const uInt8 c = tiaFrame[bufofs];
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const uInt32 retVal = getRGBPhosphor(myPalette[c], rgbFrame[bufofs]);
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// Store back into displayed frame buffer (for next frame)
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rgbFrame[bufofs] = retVal;
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buffer[pos++] = retVal;
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}
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bufofsY += width;
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screenofsY += pitch;
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}
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break;
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}
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case kBlarggNormal:
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{
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myNTSCFilter.blit_single(tiaFrame, width, height, buffer, pitch << 2);
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break;
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}
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case kBlarggPhosphor:
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{
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#if 0 // FIXME
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myNTSCFilter.blit_double(currentFrame, previousFrame, width, height,
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buffer, pitch << 2);
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#endif
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break;
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}
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}
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// Draw TIA image
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myTiaSurface->setDirty();
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myTiaSurface->render();
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// Draw overlaying scanlines
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if(myScanlinesEnabled)
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{
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mySLineSurface->setDirty();
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mySLineSurface->render();
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}
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}
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