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6d582c80d3
SourceGen Edit Commands is a feature that allows you to generate commands into a file and have SourceGen apply them to the current project. I'm not expecting this to be used by anyone but me, so for now I'm just adding an entry to the debug menu that can read comments out of a file. Also, fixed a bug in the re-centering min/max code that prevented it from working on trivial shapes. Also, renamed the atari-avg visualizer to atari-avg-bz, with the expectation that one day somebody might want to create a variant for newer games.
296 lines
12 KiB
C#
296 lines
12 KiB
C#
/*
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* Copyright 2020 faddenSoft
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.ObjectModel;
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using PluginCommon;
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namespace RuntimeData.Atari {
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/// <summary>
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/// Visualizer for Atari Analog Vector Generator commands.
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///
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/// References:
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/// http://www.ionpool.net/arcade/atari_docs/avg.pdf
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/// https://www.jmargolin.com/vgens/vgcmd.pdf
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/// http://www.brouhaha.com/~eric/software/vecsim/
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///
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/// https://github.com/mamedev/mame/blob/master/src/mame/video/avgdvg.cpp is the
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/// definitive description, but it's harder to parse than the above (it's emulating
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/// the hardware at a lower level).
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/// </summary>
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public class VisAVG : MarshalByRefObject, IPlugin, IPlugin_Visualizer_v2 {
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// IPlugin
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public string Identifier {
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get { return "Atari AVG Visualizer"; }
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}
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private IApplication mAppRef;
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private byte[] mFileData;
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private AddressTranslate mAddrTrans;
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// Visualization identifiers; DO NOT change or projects that use them will break.
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private const string VIS_GEN_AVG = "atari-avg-bz"; // Battlezone, Red Baron
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private const string P_OFFSET = "offset";
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private const string P_BASE_ADDR = "baseAddr";
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// Visualization descriptors.
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private VisDescr[] mDescriptors = new VisDescr[] {
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new VisDescr(VIS_GEN_AVG, "Atari AVG Commands", VisDescr.VisType.Wireframe,
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new VisParamDescr[] {
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new VisParamDescr("File offset (hex)",
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P_OFFSET, typeof(int), 0, 0x00ffffff, VisParamDescr.SpecialMode.Offset, 0),
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new VisParamDescr("Base address",
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P_BASE_ADDR, typeof(int), 0x0000, 0xffff, 0, 0x2000),
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VisWireframe.Param_IsRecentered("Centered", true),
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}),
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};
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// IPlugin
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public void Prepare(IApplication appRef, byte[] fileData, AddressTranslate addrTrans) {
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mAppRef = appRef;
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mFileData = fileData;
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mAddrTrans = addrTrans;
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}
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// IPlugin
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public void Unprepare() {
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mAppRef = null;
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mFileData = null;
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mAddrTrans = null;
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}
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// IPlugin_Visualizer
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public VisDescr[] GetVisGenDescrs() {
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if (mFileData == null) {
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return null;
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}
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return mDescriptors;
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}
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// IPlugin_Visualizer
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public IVisualization2d Generate2d(VisDescr descr,
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ReadOnlyDictionary<string, object> parms) {
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mAppRef.ReportError("2d not supported");
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return null;
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}
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// IPlugin_Visualizer_v2
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public IVisualizationWireframe GenerateWireframe(VisDescr descr,
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ReadOnlyDictionary<string, object> parms) {
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switch (descr.Ident) {
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case VIS_GEN_AVG:
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return GenerateWireframe(parms);
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default:
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mAppRef.ReportError("Unknown ident " + descr.Ident);
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return null;
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}
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}
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private enum Opcode {
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Unknown = 0, VCTR, HALT, SVEC, STAT, SCAL, CNTR, JSR, RTS, JMP
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}
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private IVisualizationWireframe GenerateWireframe(ReadOnlyDictionary<string, object> parms) {
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int offset = Util.GetFromObjDict(parms, P_OFFSET, 0);
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int baseAddr = Util.GetFromObjDict(parms, P_BASE_ADDR, 0);
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if (offset < 0 || offset >= mFileData.Length) {
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// should be caught by editor
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mAppRef.ReportError("Invalid parameter");
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return null;
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}
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VisWireframe vw = new VisWireframe();
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vw.Is2d = true;
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try {
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int[] stack = new int[4];
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int stackPtr = 0;
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int beamX = 0;
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int beamY = 0;
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double scale = 1.0;
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bool done = false;
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int centerVertex = vw.AddVertex(0, 0, 0);
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int curVertex = centerVertex;
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while (!done && offset < mFileData.Length) {
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ushort code0 = (ushort)Util.GetWord(mFileData, offset, 2, false);
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offset += 2;
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Opcode opc = GetOpcode(code0);
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int dx, dy, ii, vaddr;
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switch (opc) {
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case Opcode.VCTR: // 000YYYYY YYYYYYYY IIIXXXXX XXXXXXXX
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ushort code1 = (ushort)Util.GetWord(mFileData, offset, 2, false);
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offset += 2;
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dy = sign13(code0 & 0x1fff);
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dx = sign13(code1 & 0x1fff);
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ii = code1 >> 13;
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beamX += (int)Math.Round(dx * scale);
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beamY += (int)Math.Round(dy * scale);
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if (ii == 0) {
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// move only
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curVertex = vw.AddVertex(beamX, beamY, 0);
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} else if (dx == 0 && dy == 0) {
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// plot point
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vw.AddPoint(curVertex);
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//mAppRef.DebugLog("PLOT v" + curVertex + ": "
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// + beamX + "," + beamY);
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} else {
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// draw line from previous vertex
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int newVertex = vw.AddVertex(beamX, beamY, 0);
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vw.AddEdge(curVertex, newVertex);
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curVertex = newVertex;
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}
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break;
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case Opcode.HALT: // 00100000 00100000
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if (stackPtr != 0) {
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mAppRef.DebugLog("NOTE: encountered HALT with nonzero stack");
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}
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done = true;
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break;
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case Opcode.SVEC: // 010YYYYY IIIXXXXX
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dy = sign5((code0 >> 8) & 0x1f) * 2;
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dx = sign5(code0 & 0x1f) * 2;
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ii = (code0 >> 5) & 0x07;
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if (ii != 1) {
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ii *= 2;
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}
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// note dx/dy==0 is not supported for SVEC
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beamX += (int)Math.Round(dx * scale);
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beamY += (int)Math.Round(dy * scale);
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if (ii == 0) {
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// move only
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curVertex = vw.AddVertex(beamX, beamY, 0);
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} else {
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// draw line from previous vertex
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int newVertex = vw.AddVertex(beamX, beamY, 0);
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vw.AddEdge(curVertex, newVertex);
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//mAppRef.DebugLog("SVEC edge " + curVertex + " - " + newVertex);
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curVertex = newVertex;
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}
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break;
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case Opcode.STAT: // 0110-EHO IIIICCCC
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// Note this is different for e.g. Star Wars: 0110-RGB ZZZZZZZZ
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ii = (code0 >> 4) & 0x0f;
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break;
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case Opcode.SCAL: // 0111-BBB LLLLLLLL
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// Binary scaling adjusts vector drawing time, linear scaling does
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// not. (Does this affect the intensity?)
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int bs = (code0 >> 8) & 0x07;
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int ls = code0 & 0xff;
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scale = (16384 - (ls << 6)) >> bs;
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break;
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case Opcode.CNTR: // 10000000 01------
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beamX = beamY = 0;
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curVertex = centerVertex;
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break;
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case Opcode.JSR: // 101-AAAA AAAAAAAA
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vaddr = code0 & 0x0fff; // spec says 12 bits, VECSIM uses 13
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if (stackPtr == stack.Length) {
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mAppRef.ReportError("Stack overflow at +" + offset.ToString("x6"));
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return null;
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}
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stack[stackPtr++] = offset;
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if (!Branch(vaddr, baseAddr, ref offset)) {
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return null;
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}
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break;
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case Opcode.RTS: // 110----- --------
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if (stackPtr == 0) {
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done = true;
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} else {
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offset = stack[--stackPtr];
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}
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break;
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case Opcode.JMP: // 111-AAAA AAAAAAAA
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vaddr = code0 & 0x0fff; // spec says 12 bits, VECSIM uses 13
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if (!Branch(vaddr, baseAddr, ref offset)) {
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return null;
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}
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break;
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default:
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mAppRef.ReportError("Unhandled code $" + code0.ToString("x4"));
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return null;
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}
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}
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} catch (IndexOutOfRangeException) {
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// assume it was our file data access that caused the failure
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mAppRef.ReportError("Ran off end of file");
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return null;
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}
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string msg;
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if (!vw.Validate(out msg)) {
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mAppRef.ReportError("Data error: " + msg);
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return null;
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}
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return vw;
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}
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private Opcode GetOpcode(ushort code) {
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switch (code & 0xe000) {
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case 0x0000: return Opcode.VCTR;
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case 0x2000: return Opcode.HALT;
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case 0x4000: return Opcode.SVEC;
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case 0x6000: return ((code & 0xf000) == 0x6000) ? Opcode.STAT : Opcode.SCAL;
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case 0x8000: return Opcode.CNTR;
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case 0xa000: return Opcode.JSR;
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case 0xc000: return Opcode.RTS;
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case 0xe000: return Opcode.JMP;
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default: return Opcode.Unknown; // shouldn't be possible
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}
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}
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// Sign-extend a signed 5-bit value.
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int sign5(int val) {
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byte val5 = (byte)(val << 3);
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return (sbyte)val5 >> 3;
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}
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// Sign-extend a signed 13-bit value.
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int sign13(int val) {
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ushort val13 = (ushort)(val << 3);
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return (short)val13 >> 3;
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}
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/// <summary>
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/// Converts a JSR/JMP operand to a file offset.
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/// </summary>
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/// <param name="vaddr">AVG address operand.</param>
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/// <param name="baseAddr">Base address of vector memory.</param>
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/// <param name="offset">File offset of instruction.</param>
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/// <returns>False if the target address is outside the file bounds.</returns>
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private bool Branch(int vaddr, int baseAddr, ref int offset) {
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int fileAddr = baseAddr + vaddr * 2;
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int fileOffset = mAddrTrans.AddressToOffset(offset, fileAddr);
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if (fileOffset < 0) {
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mAppRef.ReportError("JMP/JSR to " + vaddr.ToString("x4") + " invalid");
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return false;
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}
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offset = fileOffset;
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return true;
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}
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}
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}
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