forked from Mirror/Ryujinx
644 lines
No EOL
21 KiB
C#
644 lines
No EOL
21 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Text;
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namespace Ryujinx.Graphics.Gal.Shader
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{
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class GlslDecompiler
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{
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private delegate string GetInstExpr(ShaderIrOp Op);
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private Dictionary<ShaderIrInst, GetInstExpr> InstsExpr;
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private enum OperType
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{
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Bool,
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F32,
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I32
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}
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private const string IdentationStr = " ";
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private static string[] ElemTypes = new string[] { "float", "vec2", "vec3", "vec4" };
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private GlslDecl Decl;
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private StringBuilder SB;
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public GlslDecompiler()
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{
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InstsExpr = new Dictionary<ShaderIrInst, GetInstExpr>()
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{
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{ ShaderIrInst.And, GetAndExpr },
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{ ShaderIrInst.Asr, GetAsrExpr },
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{ ShaderIrInst.Band, GetBandExpr },
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{ ShaderIrInst.Bnot, GetBnotExpr },
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{ ShaderIrInst.Clt, GetCltExpr },
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{ ShaderIrInst.Ceq, GetCeqExpr },
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{ ShaderIrInst.Cle, GetCleExpr },
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{ ShaderIrInst.Cgt, GetCgtExpr },
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{ ShaderIrInst.Cne, GetCneExpr },
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{ ShaderIrInst.Cge, GetCgeExpr },
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{ ShaderIrInst.Exit, GetExitExpr },
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{ ShaderIrInst.Fabs, GetFabsExpr },
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{ ShaderIrInst.Fadd, GetFaddExpr },
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{ ShaderIrInst.Fcos, GetFcosExpr },
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{ ShaderIrInst.Fex2, GetFex2Expr },
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{ ShaderIrInst.Ffma, GetFfmaExpr },
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{ ShaderIrInst.Flg2, GetFlg2Expr },
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{ ShaderIrInst.Fmul, GetFmulExpr },
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{ ShaderIrInst.Fneg, GetFnegExpr },
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{ ShaderIrInst.Frcp, GetFrcpExpr },
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{ ShaderIrInst.Frsq, GetFrsqExpr },
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{ ShaderIrInst.Fsin, GetFsinExpr },
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{ ShaderIrInst.Ipa, GetIpaExpr },
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{ ShaderIrInst.Kil, GetKilExpr },
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{ ShaderIrInst.Lsr, GetLsrExpr },
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{ ShaderIrInst.Not, GetNotExpr },
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{ ShaderIrInst.Or, GetOrExpr },
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{ ShaderIrInst.Stof, GetStofExpr },
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{ ShaderIrInst.Utof, GetUtofExpr },
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{ ShaderIrInst.Texr, GetTexrExpr },
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{ ShaderIrInst.Texg, GetTexgExpr },
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{ ShaderIrInst.Texb, GetTexbExpr },
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{ ShaderIrInst.Texa, GetTexaExpr },
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{ ShaderIrInst.Xor, GetXorExpr },
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};
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}
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public GlslProgram Decompile(int[] Code, GalShaderType ShaderType)
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{
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ShaderIrBlock Block = ShaderDecoder.DecodeBasicBlock(Code, 0, ShaderType);
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ShaderIrNode[] Nodes = Block.GetNodes();
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Decl = new GlslDecl(Nodes, ShaderType);
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SB = new StringBuilder();
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SB.AppendLine("#version 330 core");
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PrintDeclTextures();
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PrintDeclUniforms();
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PrintDeclInAttributes();
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PrintDeclOutAttributes();
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PrintDeclGprs();
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PrintDeclPreds();
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PrintBlockScope("void main()", 1, Nodes);
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string GlslCode = SB.ToString();
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return new GlslProgram(
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GlslCode,
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Decl.Textures.Values,
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Decl.Uniforms.Values);
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}
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private void PrintDeclTextures()
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{
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PrintDecls(Decl.Textures, "uniform sampler2D");
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}
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private void PrintDeclUniforms()
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{
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foreach (ShaderDeclInfo DeclInfo in Decl.Uniforms.Values.OrderBy(DeclKeySelector))
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{
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SB.AppendLine($"uniform {GetDecl(DeclInfo)};");
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}
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if (Decl.Uniforms.Count > 0)
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{
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SB.AppendLine();
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}
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}
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private void PrintDeclInAttributes()
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{
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PrintDeclAttributes(Decl.InAttributes.Values, "in");
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}
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private void PrintDeclOutAttributes()
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{
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PrintDeclAttributes(Decl.OutAttributes.Values, "out");
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}
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private void PrintDeclAttributes(IEnumerable<ShaderDeclInfo> Decls, string InOut)
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{
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int Count = 0;
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foreach (ShaderDeclInfo DeclInfo in Decls.OrderBy(DeclKeySelector))
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{
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if (DeclInfo.Index >= 0)
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{
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SB.AppendLine($"layout (location = {DeclInfo.Index}) {InOut} {GetDecl(DeclInfo)};");
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Count++;
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}
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}
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if (Count > 0)
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{
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SB.AppendLine();
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}
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}
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private void PrintDeclGprs()
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{
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PrintDecls(Decl.Gprs);
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}
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private void PrintDeclPreds()
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{
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PrintDecls(Decl.Preds, "bool");
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}
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private void PrintDecls(IReadOnlyDictionary<int, ShaderDeclInfo> Dict, string CustomType = null)
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{
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foreach (ShaderDeclInfo DeclInfo in Dict.Values.OrderBy(DeclKeySelector))
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{
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string Name;
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if (CustomType != null)
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{
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Name = CustomType + " " + DeclInfo.Name + ";";
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}
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else if (DeclInfo.Name == GlslDecl.FragmentOutputName)
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{
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Name = "layout (location = 0) out " + GetDecl(DeclInfo) + ";";
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}
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else
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{
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Name = GetDecl(DeclInfo) + ";";
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}
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SB.AppendLine(Name);
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}
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if (Dict.Count > 0)
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{
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SB.AppendLine();
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}
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}
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private int DeclKeySelector(ShaderDeclInfo DeclInfo)
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{
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return DeclInfo.Cbuf << 24 | DeclInfo.Index;
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}
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private string GetDecl(ShaderDeclInfo DeclInfo)
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{
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return ElemTypes[DeclInfo.Size - 1] + " " + DeclInfo.Name;
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}
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private void PrintBlockScope(string ScopeName, int IdentationLevel, params ShaderIrNode[] Nodes)
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{
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string Identation = string.Empty;
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for (int Index = 0; Index < IdentationLevel - 1; Index++)
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{
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Identation += IdentationStr;
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}
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if (ScopeName != string.Empty)
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{
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ScopeName += " ";
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}
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SB.AppendLine(Identation + ScopeName + "{");
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string LastLine = Identation + "}";
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if (IdentationLevel > 0)
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{
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Identation += IdentationStr;
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}
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for (int Index = 0; Index < Nodes.Length; Index++)
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{
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ShaderIrNode Node = Nodes[Index];
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if (Node is ShaderIrCond Cond)
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{
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string SubScopeName = "if (" + GetSrcExpr(Cond.Pred, true) + ")";
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PrintBlockScope(SubScopeName, IdentationLevel + 1, Cond.Child);
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}
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else if (Node is ShaderIrAsg Asg && IsValidOutOper(Asg.Dst))
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{
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string Expr = GetSrcExpr(Asg.Src, true);
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Expr = GetExprWithCast(Asg.Dst, Asg.Src, Expr);
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SB.AppendLine(Identation + GetDstOperName(Asg.Dst) + " = " + Expr + ";");
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}
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else if (Node is ShaderIrOp Op)
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{
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SB.AppendLine(Identation + GetSrcExpr(Op, true) + ";");
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}
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else
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{
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throw new InvalidOperationException();
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}
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}
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SB.AppendLine(LastLine);
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}
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private bool IsValidOutOper(ShaderIrNode Node)
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{
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if (Node is ShaderIrOperGpr Gpr && Gpr.IsConst)
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{
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return false;
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}
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else if (Node is ShaderIrOperPred Pred && Pred.IsConst)
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{
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return false;
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}
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return true;
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}
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private string GetDstOperName(ShaderIrNode Node)
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{
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if (Node is ShaderIrOperAbuf Abuf)
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{
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return GetOutAbufName(Abuf);
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}
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else if (Node is ShaderIrOperGpr Gpr)
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{
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return GetName(Gpr);
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}
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else if (Node is ShaderIrOperPred Pred)
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{
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return GetName(Pred);
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}
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throw new ArgumentException(nameof(Node));
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}
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private string GetSrcExpr(ShaderIrNode Node, bool Entry = false)
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{
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switch (Node)
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{
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case ShaderIrOperAbuf Abuf: return GetName (Abuf);
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case ShaderIrOperCbuf Cbuf: return GetName (Cbuf);
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case ShaderIrOperGpr Gpr: return GetName (Gpr);
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case ShaderIrOperImm Imm: return GetValue(Imm);
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case ShaderIrOperImmf Immf: return GetValue(Immf);
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case ShaderIrOperPred Pred: return GetName (Pred);
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case ShaderIrOp Op:
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string Expr;
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if (InstsExpr.TryGetValue(Op.Inst, out GetInstExpr GetExpr))
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{
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Expr = GetExpr(Op);
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}
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else
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{
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throw new NotImplementedException(Op.Inst.ToString());
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}
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if (!Entry && NeedsParentheses(Op))
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{
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Expr = "(" + Expr + ")";
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}
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return Expr;
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default: throw new ArgumentException(nameof(Node));
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}
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}
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private static bool NeedsParentheses(ShaderIrOp Op)
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{
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switch (Op.Inst)
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{
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case ShaderIrInst.Frcp:
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return true;
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case ShaderIrInst.Ipa:
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case ShaderIrInst.Texr:
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case ShaderIrInst.Texg:
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case ShaderIrInst.Texb:
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case ShaderIrInst.Texa:
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return false;
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}
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return Op.OperandB != null ||
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Op.OperandC != null;
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}
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private string GetName(ShaderIrOperCbuf Cbuf)
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{
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if (!Decl.Uniforms.TryGetValue((Cbuf.Index, Cbuf.Offs), out ShaderDeclInfo DeclInfo))
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{
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throw new InvalidOperationException();
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}
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return DeclInfo.Name;
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}
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private string GetOutAbufName(ShaderIrOperAbuf Abuf)
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{
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return GetName(Decl.OutAttributes, Abuf);
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}
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private string GetName(ShaderIrOperAbuf Abuf)
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{
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if (Abuf.Offs == GlslDecl.GlPositionWAttr && Decl.ShaderType == GalShaderType.Fragment)
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{
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return "(1f / gl_FragCoord.w)";
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}
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if (Abuf.Offs == GlslDecl.VertexIdAttr)
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{
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return "gl_VertexID";
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}
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return GetName(Decl.InAttributes, Abuf);
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}
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private string GetName(IReadOnlyDictionary<int, ShaderDeclInfo> Dict, ShaderIrOperAbuf Abuf)
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{
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int Index = Abuf.Offs >> 4;
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int Elem = (Abuf.Offs >> 2) & 3;
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if (!Dict.TryGetValue(Index, out ShaderDeclInfo DeclInfo))
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{
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throw new InvalidOperationException();
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}
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return DeclInfo.Size > 1 ? DeclInfo.Name + "." + GetAttrSwizzle(Elem) : DeclInfo.Name;
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}
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private string GetName(ShaderIrOperGpr Gpr)
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{
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return Gpr.IsConst ? "0" : GetNameWithSwizzle(Decl.Gprs, Gpr.Index);
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}
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private string GetValue(ShaderIrOperImm Imm)
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{
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//Only use hex is the value is too big and would likely be hard to read as int.
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if (Imm.Value > 0xfff ||
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Imm.Value < -0xfff)
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{
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return "0x" + Imm.Value.ToString("x8", CultureInfo.InvariantCulture);
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}
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else
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{
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return Imm.Value.ToString(CultureInfo.InvariantCulture);
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}
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}
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private string GetValue(ShaderIrOperImmf Immf)
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{
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return Immf.Value.ToString(CultureInfo.InvariantCulture) + "f";
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}
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private string GetName(ShaderIrOperPred Pred)
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{
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return Pred.IsConst ? "true" : GetNameWithSwizzle(Decl.Preds, Pred.Index);
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}
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private string GetNameWithSwizzle(IReadOnlyDictionary<int, ShaderDeclInfo> Dict, int Index)
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{
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int VecIndex = Index >> 2;
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if (Dict.TryGetValue(VecIndex, out ShaderDeclInfo DeclInfo))
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{
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if (DeclInfo.Size > 1 && Index < VecIndex + DeclInfo.Size)
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{
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return DeclInfo.Name + "." + GetAttrSwizzle(Index & 3);
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}
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}
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if (!Dict.TryGetValue(Index, out DeclInfo))
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{
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throw new InvalidOperationException();
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}
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return DeclInfo.Name;
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}
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private string GetAttrSwizzle(int Elem)
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{
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return "xyzw".Substring(Elem, 1);
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}
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private string GetAndExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "&");
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private string GetAsrExpr(ShaderIrOp Op) => GetBinaryExpr(Op, ">>");
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private string GetBandExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "&&");
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private string GetBnotExpr(ShaderIrOp Op) => GetUnaryExpr(Op, "!");
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private string GetCltExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "<");
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private string GetCeqExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "==");
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private string GetCleExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "<=");
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private string GetCgtExpr(ShaderIrOp Op) => GetBinaryExpr(Op, ">");
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private string GetCneExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "!=");
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private string GetCgeExpr(ShaderIrOp Op) => GetBinaryExpr(Op, ">=");
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private string GetExitExpr(ShaderIrOp Op) => "return";
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private string GetFabsExpr(ShaderIrOp Op) => GetUnaryCall(Op, "abs");
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private string GetFaddExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "+");
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private string GetFcosExpr(ShaderIrOp Op) => GetUnaryCall(Op, "cos");
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private string GetFex2Expr(ShaderIrOp Op) => GetUnaryCall(Op, "exp2");
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private string GetFfmaExpr(ShaderIrOp Op) => GetTernaryExpr(Op, "*", "+");
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private string GetFlg2Expr(ShaderIrOp Op) => GetUnaryCall(Op, "log2");
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private string GetFmulExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "*");
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private string GetFnegExpr(ShaderIrOp Op) => GetUnaryExpr(Op, "-");
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private string GetFrcpExpr(ShaderIrOp Op) => GetUnaryExpr(Op, "1f / ");
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private string GetFrsqExpr(ShaderIrOp Op) => GetUnaryCall(Op, "inversesqrt");
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private string GetFsinExpr(ShaderIrOp Op) => GetUnaryCall(Op, "sin");
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private string GetIpaExpr(ShaderIrOp Op) => GetSrcExpr(Op.OperandA);
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private string GetKilExpr(ShaderIrOp Op) => "discard";
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private string GetLsrExpr(ShaderIrOp Op)
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{
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return "int(uint(" + GetOperExpr(Op, Op.OperandA) + ") >> " +
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GetOperExpr(Op, Op.OperandB) + ")";
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}
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private string GetNotExpr(ShaderIrOp Op) => GetUnaryExpr(Op, "~");
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private string GetOrExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "|");
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private string GetStofExpr(ShaderIrOp Op)
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{
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return "float(" + GetOperExpr(Op, Op.OperandA) + ")";
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}
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private string GetUtofExpr(ShaderIrOp Op)
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{
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return "float(uint(" + GetOperExpr(Op, Op.OperandA) + "))";
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}
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private string GetXorExpr(ShaderIrOp Op) => GetBinaryExpr(Op, "^");
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private string GetUnaryCall(ShaderIrOp Op, string FuncName)
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{
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return FuncName + "(" + GetOperExpr(Op, Op.OperandA) + ")";
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}
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private string GetUnaryExpr(ShaderIrOp Op, string Opr)
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{
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return Opr + GetOperExpr(Op, Op.OperandA);
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}
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private string GetBinaryExpr(ShaderIrOp Op, string Opr)
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{
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return GetOperExpr(Op, Op.OperandA) + " " + Opr + " " +
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GetOperExpr(Op, Op.OperandB);
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}
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private string GetTernaryExpr(ShaderIrOp Op, string Opr1, string Opr2)
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{
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return GetOperExpr(Op, Op.OperandA) + " " + Opr1 + " " +
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GetOperExpr(Op, Op.OperandB) + " " + Opr2 + " " +
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GetOperExpr(Op, Op.OperandC);
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}
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private string GetTexrExpr(ShaderIrOp Op) => GetTexExpr(Op, 'r');
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private string GetTexgExpr(ShaderIrOp Op) => GetTexExpr(Op, 'g');
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private string GetTexbExpr(ShaderIrOp Op) => GetTexExpr(Op, 'b');
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private string GetTexaExpr(ShaderIrOp Op) => GetTexExpr(Op, 'a');
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private string GetTexExpr(ShaderIrOp Op, char Ch)
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{
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return $"texture({GetTexSamplerName(Op)}, {GetTexSamplerCoords(Op)}).{Ch}";
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}
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private string GetTexSamplerName(ShaderIrOp Op)
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{
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ShaderIrOperImm Node = (ShaderIrOperImm)Op.OperandC;
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int Handle = ((ShaderIrOperImm)Op.OperandC).Value;
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if (!Decl.Textures.TryGetValue(Handle, out ShaderDeclInfo DeclInfo))
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{
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throw new InvalidOperationException();
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}
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return DeclInfo.Name;
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}
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private string GetTexSamplerCoords(ShaderIrOp Op)
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{
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return "vec2(" + GetOperExpr(Op, Op.OperandA) + ", " +
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GetOperExpr(Op, Op.OperandB) + ")";
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}
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private string GetOperExpr(ShaderIrOp Op, ShaderIrNode Oper)
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{
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return GetExprWithCast(Op, Oper, GetSrcExpr(Oper));
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}
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private static string GetExprWithCast(ShaderIrNode Dst, ShaderIrNode Src, string Expr)
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{
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//Note: The "DstType" (of the cast) is the type that the operation
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//uses on the source operands, while the "SrcType" is the destination
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//type of the operand result (if it is a operation) or just the type
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//of the variable for registers/uniforms/attributes.
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OperType DstType = GetSrcNodeType(Dst);
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OperType SrcType = GetDstNodeType(Src);
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if (DstType != SrcType)
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{
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//Check for invalid casts
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//(like bool to int/float and others).
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if (SrcType != OperType.F32 &&
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SrcType != OperType.I32)
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{
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throw new InvalidOperationException();
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}
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//For integer immediates being used as float,
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//it's better (for readability) to just return the float value.
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if (Src is ShaderIrOperImm Imm && DstType == OperType.F32)
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{
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float Value = BitConverter.Int32BitsToSingle(Imm.Value);
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return Value.ToString(CultureInfo.InvariantCulture) + "f";
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}
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|
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switch (DstType)
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{
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case OperType.F32: Expr = "intBitsToFloat(" + Expr + ")"; break;
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case OperType.I32: Expr = "floatBitsToInt(" + Expr + ")"; break;
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}
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}
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|
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return Expr;
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}
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|
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private static OperType GetDstNodeType(ShaderIrNode Node)
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|
{
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if (Node is ShaderIrOp Op)
|
|
{
|
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switch (Op.Inst)
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|
{
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case ShaderIrInst.Stof: return OperType.F32;
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case ShaderIrInst.Utof: return OperType.F32;
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}
|
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}
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|
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return GetSrcNodeType(Node);
|
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}
|
|
|
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private static OperType GetSrcNodeType(ShaderIrNode Node)
|
|
{
|
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switch (Node)
|
|
{
|
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case ShaderIrOperAbuf Abuf:
|
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return Abuf.Offs == GlslDecl.VertexIdAttr
|
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? OperType.I32
|
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: OperType.F32;
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|
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case ShaderIrOperCbuf Cbuf: return OperType.F32;
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case ShaderIrOperGpr Gpr: return OperType.F32;
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case ShaderIrOperImm Imm: return OperType.I32;
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case ShaderIrOperImmf Immf: return OperType.F32;
|
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case ShaderIrOperPred Pred: return OperType.Bool;
|
|
|
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case ShaderIrOp Op:
|
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if (Op.Inst > ShaderIrInst.B_Start &&
|
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Op.Inst < ShaderIrInst.B_End)
|
|
{
|
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return OperType.Bool;
|
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}
|
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else if (Op.Inst > ShaderIrInst.F_Start &&
|
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Op.Inst < ShaderIrInst.F_End)
|
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{
|
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return OperType.F32;
|
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}
|
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else if (Op.Inst > ShaderIrInst.I_Start &&
|
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Op.Inst < ShaderIrInst.I_End)
|
|
{
|
|
return OperType.I32;
|
|
}
|
|
break;
|
|
}
|
|
|
|
throw new ArgumentException(nameof(Node));
|
|
}
|
|
}
|
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} |