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83
...m-ula/src/main/java/net/emustudio/plugins/device/zxspectrum/ula/PassedCyclesMediator.java
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| /* | ||
| * This file is part of emuStudio. | ||
| * | ||
| * Copyright (C) 2006-2024 Peter Jakubčo | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
| package net.emustudio.plugins.device.zxspectrum.ula; | ||
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| import net.emustudio.emulib.plugins.cpu.CPUContext; | ||
| import net.emustudio.plugins.device.zxspectrum.ula.gui.DisplayCanvas; | ||
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| import java.util.Objects; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
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| import static net.emustudio.plugins.device.zxspectrum.ula.ZxParameters.*; | ||
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| /** | ||
| * Triggers actions based on passed CPU cycles. | ||
| * <p> | ||
| * For <a href="https://worldofspectrum.org/faq/reference/48kreference.htm">ZX Spectrum 48K</a> the actions are: | ||
| * <p> | ||
| * - 0: CPU interrupt | ||
| * - 0 - 14336: first 64 lines. From those, at least 48 are border-lines, others are either border or vertical retraces | ||
| * After an interrupt occurs, 64 line times (14336 T states; see below for exact timings) pass before | ||
| * - 14337 - 57344: 192 screen lines are displayed | ||
| * - 57345 - 69888: 56 border-lines are displayed | ||
| * <p> | ||
| * This means a frame is (64+192+56)*224=69888 T states long, which means that the CPU interrupt occurs | ||
| * at 3.5MHz/69888=50.08 Hz. | ||
| */ | ||
| public class PassedCyclesMediator implements CPUContext.PassedCyclesListener { | ||
| private static final long LINE_CYCLES = 224; | ||
| private static final long FRAME_CYCLES = (PRE_SCREEN_LINES + SCREEN_HEIGHT + POST_SCREEN_LINES) * LINE_CYCLES; // 69888; | ||
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| private long frameCycles = 0; | ||
| private long lineCycles = 0; | ||
| private int lastLinePainted = 0; | ||
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| private final AtomicReference<DisplayCanvas> canvas = new AtomicReference<>(); | ||
| private final ULA ula; | ||
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| public PassedCyclesMediator(ULA ula) { | ||
| this.ula = Objects.requireNonNull(ula); | ||
| } | ||
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| public void setCanvas(DisplayCanvas canvas) { | ||
| this.canvas.set(canvas); | ||
| } | ||
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| @Override | ||
| public void passedCycles(long cycles) { | ||
| frameCycles += cycles; | ||
| lineCycles += cycles; | ||
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| DisplayCanvas canvas = this.canvas.get(); | ||
| if (canvas != null) { | ||
| if (lineCycles >= LINE_CYCLES) { | ||
| canvas.drawNextLine(lastLinePainted++); | ||
| } | ||
| } | ||
| lineCycles = lineCycles % LINE_CYCLES; | ||
| if (frameCycles >= FRAME_CYCLES) { | ||
| lastLinePainted = 0; | ||
| ula.onNextFrame(); | ||
| frameCycles = frameCycles % FRAME_CYCLES; | ||
| if (canvas != null) { | ||
| canvas.runPaintCycle(); // expensive operation | ||
| } | ||
| } | ||
| } | ||
| } |
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36
...xspectrum-ula/src/main/java/net/emustudio/plugins/device/zxspectrum/ula/ZxParameters.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,36 @@ | ||
| /* | ||
| * This file is part of emuStudio. | ||
| * | ||
| * Copyright (C) 2006-2024 Peter Jakubčo | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
| package net.emustudio.plugins.device.zxspectrum.ula; | ||
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| public class ZxParameters { | ||
| public static final int SCREEN_WIDTH = 32; // in bytes; each byte represents 8 pixels in a row, reversed | ||
| public static final int SCREEN_HEIGHT = 192; | ||
| public static final int ATTRIBUTE_HEIGHT = SCREEN_HEIGHT / 8; | ||
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| public static final int PRE_SCREEN_LINES = 64; | ||
| public static final int POST_SCREEN_LINES = 56; | ||
| public static final int BORDER_WIDTH = 48; // pixels | ||
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| public static final int SCREEN_IMAGE_WIDTH = 2 * BORDER_WIDTH + SCREEN_WIDTH * 8; | ||
| public static final int SCREEN_IMAGE_HEIGHT = PRE_SCREEN_LINES + SCREEN_HEIGHT + POST_SCREEN_LINES; | ||
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| // The Spectrum's 'FLASH' effect is also produced by the ULA: Every 16 frames, the ink and paper of all flashing | ||
| // bytes is swapped; ie a normal to inverted to normal cycle takes 32 frames, which is (good as) 0.64 seconds. | ||
| public static final int VIDEO_FLASH_FRAME = 15; | ||
| } |
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