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Feb 21, 2018
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100644
39 lines (30 sloc)
972 Bytes
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--Script for render scanlines, where horizontal scroll changed
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--Emulator: Mesen 0.9.4
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--Rom: any
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--Author: spiiin
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PPUSCROLL = 0x2005;
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colorCode = 0x4000FF00;
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function onStartFrame()
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emu.log("New frame");
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end
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function onEndFrame()
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emu.log("End frame");
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end
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function onIrq()
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emu.log("Irq");
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end
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function hex(arg)
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return string.format("%02x", arg)
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end
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function onScroll(address, value)
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local state = emu.getState();
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emu.log("Scrolling change. Scanline: "..state.ppu.scanline.." Value:"..value);
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local color = colorCode + state.ppu.scanline;
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emu.drawLine(0, state.ppu.scanline, 256, state.ppu.scanline, color, 1)
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end;
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emu.addEventCallback(onStartFrame, emu.eventType.startFrame);
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emu.addEventCallback(onEndFrame, emu.eventType.endFrame);
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emu.addEventCallback(onIrq, emu.eventType.irq);
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emu.addMemoryCallback(onScroll, emu.memCallbackType.cpuWrite, PPUSCROLL, PPUSCROLL+1);
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--Display a startup message
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emu.displayMessage("Script", "Script loaded.")