Use a program counter to control shaders' flow
This commit is contained in:
ReinUsesLisp
parent
056c2840b1
commit
67fb356e9f
2 changed files with 135 additions and 171 deletions
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@ -158,15 +158,15 @@ namespace Ryujinx.Graphics.Gal.Shader
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if (BlocksB != null)
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{
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PrintBlockScope(Blocks[0], null, null, "void " + GlslDecl.ProgramAName + "()", IdentationStr);
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PrintBlockScope(Blocks, "bb_a");
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SB.AppendLine();
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PrintBlockScope(BlocksB[0], null, null, "void " + GlslDecl.ProgramBName + "()", IdentationStr);
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PrintBlockScope(BlocksB, "bb_b");
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}
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else
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{
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PrintBlockScope(Blocks[0], null, null, "void " + GlslDecl.ProgramName + "()", IdentationStr);
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PrintBlockScope(Blocks, "bb");
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}
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SB.AppendLine();
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@ -417,14 +417,16 @@ namespace Ryujinx.Graphics.Gal.Shader
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}
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}
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SB.AppendLine(IdentationStr + "uint pc;");
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if (BlocksB != null)
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{
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SB.AppendLine(IdentationStr + GlslDecl.ProgramAName + "();");
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SB.AppendLine(IdentationStr + GlslDecl.ProgramBName + "();");
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PrintProgram(Blocks, "bb_a");
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PrintProgram(BlocksB, "bb_b");
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}
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else
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{
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SB.AppendLine(IdentationStr + GlslDecl.ProgramName + "();");
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PrintProgram(Blocks, "bb");
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}
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if (Decl.ShaderType != GalShaderType.Geometry)
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@ -435,6 +437,37 @@ namespace Ryujinx.Graphics.Gal.Shader
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SB.AppendLine("}");
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}
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private void PrintProgram(ShaderIrBlock[] Blocks, string Name)
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{
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string Ident1 = IdentationStr;
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string Ident2 = Ident1 + IdentationStr;
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string Ident3 = Ident2 + IdentationStr;
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string Ident4 = Ident3 + IdentationStr;
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SB.AppendLine(Ident1 + "pc = " + GetBlockPosition(Blocks[0]) + ";");
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SB.AppendLine(Ident1 + "do {");
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SB.AppendLine(Ident2 + "switch (pc) {");
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foreach (ShaderIrBlock Block in Blocks)
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{
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string FunctionName = Block.Position.ToString("x8");
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SB.AppendLine(Ident3 + "case 0x" + FunctionName + ": pc = " + Name + "_" + FunctionName + "(); break;");
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}
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SB.AppendLine(Ident3 + "default:");
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SB.AppendLine(Ident4 + "pc = 0;");
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SB.AppendLine(Ident4 + "break;");
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SB.AppendLine(Ident2 + "}");
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SB.AppendLine(Ident1 + "} while (pc != 0);");
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}
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private void PrintAttrToOutput(string Identation = IdentationStr)
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{
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foreach (KeyValuePair<int, ShaderDeclInfo> KV in Decl.OutAttributes)
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@ -468,75 +501,19 @@ namespace Ryujinx.Graphics.Gal.Shader
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}
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}
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private void PrintBlockScope(
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ShaderIrBlock Block,
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ShaderIrBlock EndBlock,
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ShaderIrBlock LoopBlock,
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string ScopeName,
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string Identation,
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bool IsDoWhile = false)
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private void PrintBlockScope(ShaderIrBlock[] Blocks, string Name)
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{
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string UpIdent = Identation.Substring(0, Identation.Length - IdentationStr.Length);
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foreach (ShaderIrBlock Block in Blocks)
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{
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SB.AppendLine("uint " + Name + "_" + Block.Position.ToString("x8") + "() {");
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if (IsDoWhile)
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{
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SB.AppendLine(UpIdent + "do {");
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}
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else
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{
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SB.AppendLine(UpIdent + ScopeName + " {");
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}
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PrintNodes(Block, Block.GetNodes());
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while (Block != null && Block != EndBlock)
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{
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ShaderIrNode[] Nodes = Block.GetNodes();
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Block = PrintNodes(Block, EndBlock, LoopBlock, Identation, Nodes);
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}
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if (IsDoWhile)
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{
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SB.AppendLine(UpIdent + "} " + ScopeName + ";");
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}
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else
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{
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SB.AppendLine(UpIdent + "}");
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SB.AppendLine("}" + Environment.NewLine);
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}
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}
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private ShaderIrBlock PrintNodes(
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ShaderIrBlock Block,
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ShaderIrBlock EndBlock,
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ShaderIrBlock LoopBlock,
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string Identation,
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params ShaderIrNode[] Nodes)
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{
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/*
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* Notes about control flow and if-else/loop generation:
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* The code assumes that the program has sane control flow,
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* that is, there's no jumps to a location after another jump or
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* jump target (except for the end of an if-else block), and backwards
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* jumps to a location before the last loop dominator.
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* Such cases needs to be transformed on a step before the GLSL code
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* generation to ensure that we have sane graphs to work with.
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* TODO: Such transformation is not yet implemented.
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*/
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string NewIdent = Identation + IdentationStr;
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ShaderIrBlock LoopTail = GetLoopTailBlock(Block);
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if (LoopTail != null && LoopBlock != Block)
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{
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//Shoock! kuma shock! We have a loop here!
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//The entire sequence needs to be inside a do-while block.
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ShaderIrBlock LoopEnd = GetDownBlock(LoopTail);
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PrintBlockScope(Block, LoopEnd, Block, "while (false)", NewIdent, IsDoWhile: true);
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return LoopEnd;
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}
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foreach (ShaderIrNode Node in Nodes)
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private void PrintNode(ShaderIrBlock Block, ShaderIrNode Node, string Identation)
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{
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if (Node is ShaderIrCond Cond)
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{
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@ -547,44 +524,19 @@ namespace Ryujinx.Graphics.Gal.Shader
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IfExpr = "!(" + IfExpr + ")";
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}
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if (Cond.Child is ShaderIrOp Op && Op.Inst == ShaderIrInst.Bra)
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{
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//Branch is a loop branch and would result in infinite recursion.
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if (Block.Branch.Position <= Block.Position)
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{
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SB.AppendLine(Identation + "if (" + IfExpr + ") {");
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SB.AppendLine(Identation + IdentationStr + "continue;");
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SB.AppendLine(Identation + "}");
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continue;
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}
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string SubScopeName = "if (!" + IfExpr + ")";
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PrintBlockScope(Block.Next, Block.Branch, LoopBlock, SubScopeName, NewIdent);
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ShaderIrBlock IfElseEnd = GetUpBlock(Block.Branch).Branch;
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if (IfElseEnd?.Position > Block.Branch.Position)
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if (Cond.Child is ShaderIrOp Op && Op.Inst == ShaderIrInst.Bra)
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{
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PrintBlockScope(Block.Branch, IfElseEnd, LoopBlock, "else", NewIdent);
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return IfElseEnd;
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}
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return Block.Branch;
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SB.AppendLine(Identation + IdentationStr + "return " + GetBlockPosition(Block.Branch) + ";");
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}
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else
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{
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SB.AppendLine(Identation + "if (" + IfExpr + ") {");
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PrintNodes(Block, EndBlock, LoopBlock, NewIdent, Cond.Child);
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PrintNode(Block, Cond.Child, Identation + IdentationStr);
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}
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SB.AppendLine(Identation + "}");
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}
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}
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else if (Node is ShaderIrAsg Asg)
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{
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if (IsValidOutOper(Asg.Dst))
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@ -600,10 +552,7 @@ namespace Ryujinx.Graphics.Gal.Shader
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{
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if (Op.Inst == ShaderIrInst.Bra)
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{
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if (Block.Branch.Position <= Block.Position)
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{
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SB.AppendLine(Identation + "continue;");
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}
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SB.AppendLine(Identation + "return " + GetBlockPosition(Block.Branch) + ";");
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}
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else if (Op.Inst == ShaderIrInst.Emit)
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{
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@ -626,35 +575,38 @@ namespace Ryujinx.Graphics.Gal.Shader
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}
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}
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return Block.Next;
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private void PrintNodes(ShaderIrBlock Block, ShaderIrNode[] Nodes)
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{
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foreach (ShaderIrNode Node in Nodes)
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{
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PrintNode(Block, Node, IdentationStr);
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}
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private ShaderIrBlock GetUpBlock(ShaderIrBlock Block)
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if (Nodes.Length > 0)
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{
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return Blocks.FirstOrDefault(x => x.EndPosition == Block.Position);
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}
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ShaderIrNode Last = Nodes[Nodes.Length - 1];
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private ShaderIrBlock GetDownBlock(ShaderIrBlock Block)
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{
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return Blocks.FirstOrDefault(x => x.Position == Block.EndPosition);
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}
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bool TailBranch = false;
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private ShaderIrBlock GetLoopTailBlock(ShaderIrBlock LoopHead)
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if (Last is ShaderIrOp Op)
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{
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ShaderIrBlock Tail = null;
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foreach (ShaderIrBlock Block in LoopHead.Sources)
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switch (Op.Inst)
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{
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if (Block.Position >= LoopHead.Position)
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{
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if (Tail == null || Tail.Position < Block.Position)
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{
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Tail = Block;
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}
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case ShaderIrInst.Bra:
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case ShaderIrInst.Exit:
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case ShaderIrInst.Kil:
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TailBranch = true;
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break;
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}
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}
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return Tail;
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if (!TailBranch)
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{
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SB.AppendLine(IdentationStr + "// Jump to next block");
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SB.AppendLine(IdentationStr + "return " + GetBlockPosition(Block.Next) + ";");
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}
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}
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}
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private bool IsValidOutOper(ShaderIrNode Node)
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@ -961,7 +913,7 @@ namespace Ryujinx.Graphics.Gal.Shader
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private string GetCnumExpr(ShaderIrOp Op) => GetUnaryCall(Op, "!isnan");
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private string GetExitExpr(ShaderIrOp Op) => "return";
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private string GetExitExpr(ShaderIrOp Op) => "return 0";
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private string GetFcosExpr(ShaderIrOp Op) => GetUnaryCall(Op, "cos");
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@ -1306,5 +1258,17 @@ namespace Ryujinx.Graphics.Gal.Shader
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throw new ArgumentException(nameof(Node));
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}
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private static string GetBlockPosition(ShaderIrBlock Block)
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{
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if (Block != null)
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{
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return "0x" + Block.Position.ToString("x8") + "u";
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}
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else
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{
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return "0u";
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}
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}
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}
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}
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@ -157,7 +157,7 @@ namespace Ryujinx.Graphics.Gal.Shader
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{
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int Offset = ((int)(OpCode >> 20) << 8) >> 8;
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long Target = Position + Offset;
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long Target = Position + Offset - Beginning;
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DbgOpCode += " (0x" + Target.ToString("x16") + ")";
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}
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