Initial work

1 files changed, 127 insertions, 0 deletions

diff --git a/Ryujinx.Graphics.Shader/CodeGen/Glsl/Instructions/InstGen.cs b/Ryujinx.Graphics.Shader/CodeGen/Glsl/Instructions/InstGen.cs
new file mode 100644
index 00000000..350de348
--- /dev/null
+++ b/Ryujinx.Graphics.Shader/CodeGen/Glsl/Instructions/InstGen.cs
@@ -0,0 +1,127 @@
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using Ryujinx.Graphics.Shader.StructuredIr;
+using System;
+
+using static Ryujinx.Graphics.Shader.CodeGen.Glsl.Instructions.InstGenHelper;
+using static Ryujinx.Graphics.Shader.StructuredIr.InstructionInfo;
+
+namespace Ryujinx.Graphics.Shader.CodeGen.Glsl.Instructions
+{
+    static class InstGen
+    {
+        public static string GetExpression(CodeGenContext context, IAstNode node)
+        {
+            if (node is AstOperation operation)
+            {
+                return GetExpression(context, operation);
+            }
+            else if (node is AstOperand operand)
+            {
+                return context.OperandManager.GetExpression(operand, context.Config.Stage);
+            }
+
+            throw new ArgumentException($"Invalid node type \"{node?.GetType().Name ?? "null"}\".");
+        }
+
+        private static string GetExpression(CodeGenContext context, AstOperation operation)
+        {
+            Instruction inst = operation.Inst;
+
+            InstInfo info = GetInstructionInfo(inst);
+
+            if ((info.Type & InstType.Call) != 0)
+            {
+                int arity = (int)(info.Type & InstType.ArityMask);
+
+                string args = string.Empty;
+
+                for (int argIndex = 0; argIndex < arity; argIndex++)
+                {
+                    if (argIndex != 0)
+                    {
+                        args += ", ";
+                    }
+
+                    VariableType dstType = GetSrcVarType(inst, argIndex);
+
+                    args += GetSoureExpr(context, operation.GetSource(argIndex), dstType);
+                }
+
+                return info.OpName + "(" + args + ")";
+            }
+            else if ((info.Type & InstType.Op) != 0)
+            {
+                string op = info.OpName;
+
+                int arity = (int)(info.Type & InstType.ArityMask);
+
+                string[] expr = new string[arity];
+
+                for (int index = 0; index < arity; index++)
+                {
+                    IAstNode src = operation.GetSource(index);
+
+                    string srcExpr = GetSoureExpr(context, src, GetSrcVarType(inst, index));
+
+                    bool isLhs = arity == 2 && index == 0;
+
+                    expr[index] = Enclose(srcExpr, src, inst, info, isLhs);
+                }
+
+                switch (arity)
+                {
+                    case 0:
+                        return op;
+
+                    case 1:
+                        return op + expr[0];
+
+                    case 2:
+                        return $"{expr[0]} {op} {expr[1]}";
+
+                    case 3:
+                        return $"{expr[0]} {op[0]} {expr[1]} {op[1]} {expr[2]}";
+                }
+            }
+            else if ((info.Type & InstType.Special) != 0)
+            {
+                switch (inst)
+                {
+                    case Instruction.LoadAttribute:
+                        return InstGenMemory.LoadAttribute(context, operation);
+
+                    case Instruction.LoadConstant:
+                        return InstGenMemory.LoadConstant(context, operation);
+
+                    case Instruction.LoadLocal:
+                        return InstGenMemory.LoadLocal(context, operation);
+
+                    case Instruction.LoadStorage:
+                        return InstGenMemory.LoadStorage(context, operation);
+
+                    case Instruction.PackHalf2x16:
+                        return InstGenPacking.PackHalf2x16(context, operation);
+
+                    case Instruction.StoreLocal:
+                        return InstGenMemory.StoreLocal(context, operation);
+
+                    case Instruction.StoreStorage:
+                        return InstGenMemory.StoreStorage(context, operation);
+
+                    case Instruction.TextureSample:
+                        return InstGenMemory.TextureSample(context, operation);
+
+                    case Instruction.TextureSize:
+                        return InstGenMemory.TextureSize(context, operation);
+
+                    case Instruction.UnpackHalf2x16:
+                        return InstGenPacking.UnpackHalf2x16(context, operation);
+                }
+            }
+
+            return "0";
+
+            throw new InvalidOperationException($"Unexpected instruction type \"{info.Type}\".");
+        }
+    }
+}
\ No newline at end of file