Implement FCMP shader instruction (#1067)

Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs

@@ -90,6 +90,10 @@ namespace Ryujinx.Graphics.Shader.Decoders
             Set("0011100x01011x", InstEmit.Fadd,    typeof(OpCodeFArithImm));
             Set("000010xxxxxxxx", InstEmit.Fadd,    typeof(OpCodeFArithImm32));
             Set("0101110001011x", InstEmit.Fadd,    typeof(OpCodeFArithReg));
+            Set("010010111010xx", InstEmit.Fcmp,    typeof(OpCodeFArithCbuf));
+            Set("0011011x1010xx", InstEmit.Fcmp,    typeof(OpCodeFArithImm));
+            Set("010110111010xx", InstEmit.Fcmp,    typeof(OpCodeFArithReg));
+            Set("010100111010xx", InstEmit.Fcmp,    typeof(OpCodeFArithRegCbuf));
             Set("010010011xxxxx", InstEmit.Ffma,    typeof(OpCodeFArithCbuf));
             Set("0011001x1xxxxx", InstEmit.Ffma,    typeof(OpCodeFArithImm));
             Set("000011xxxxxxxx", InstEmit.Ffma32i, typeof(OpCodeFArithImm32));

Ryujinx.Graphics.Shader/Instructions/InstEmitFArith.cs

@@ -16,6 +16,24 @@ namespace Ryujinx.Graphics.Shader.Instructions
         public static void Dmul(EmitterContext context) => EmitFPMultiply(context, Instruction.FP64);
 
         public static void Fadd(EmitterContext context) => EmitFPAdd(context, Instruction.FP32);
+
+        public static void Fcmp(EmitterContext context)
+        {
+            OpCode op = context.CurrOp;
+
+            Condition cmpOp = (Condition)op.RawOpCode.Extract(48, 4);
+
+            Operand srcA = GetSrcA(context);
+            Operand srcB = GetSrcB(context);
+            Operand srcC = GetSrcC(context);
+
+            Operand cmpRes = GetFPComparison(context, cmpOp, srcC, ConstF(0));
+
+            Operand res = context.ConditionalSelect(cmpRes, srcA, srcB);
+
+            context.Copy(GetDest(context), res);
+        }
+
         public static void Ffma(EmitterContext context) => EmitFPFma(context, Instruction.FP32);
 
         public static void Ffma32i(EmitterContext context)