Implement CAL and RET shader instructions (#1618)

* Add support for CAL and RET shader instructions

* Remove unused stuff

* Fix a bug that could cause the wrong values to be passed to a function

* Avoid repopulating function id dictionary every time

* PR feedback

* Fix vertex shader A/B merge

Ryujinx.Graphics.Shader/IntermediateRepresentation/BasicBlock.cs

@@ -24,6 +24,7 @@ namespace Ryujinx.Graphics.Shader.IntermediateRepresentation
         }
 
         public bool HasBranch => _branch != null;
+        public bool Reachable => Index == 0 || Predecessors.Count != 0;
 
         public List<BasicBlock> Predecessors { get; }
 

Ryujinx.Graphics.Shader/IntermediateRepresentation/Function.cs

@@ -0,0 +1,23 @@
+namespace Ryujinx.Graphics.Shader.IntermediateRepresentation
+{
+    class Function
+    {
+        public BasicBlock[] Blocks { get; }
+
+        public string Name { get; }
+
+        public bool ReturnsValue { get; }
+
+        public int InArgumentsCount { get; }
+        public int OutArgumentsCount { get; }
+
+        public Function(BasicBlock[] blocks, string name, bool returnsValue, int inArgumentsCount, int outArgumentsCount)
+        {
+            Blocks = blocks;
+            Name = name;
+            ReturnsValue = returnsValue;
+            InArgumentsCount = inArgumentsCount;
+            OutArgumentsCount = outArgumentsCount;
+        }
+    }
+}

Ryujinx.Graphics.Shader/IntermediateRepresentation/Instruction.cs

@@ -31,6 +31,8 @@ namespace Ryujinx.Graphics.Shader.IntermediateRepresentation
         Branch,
         BranchIfFalse,
         BranchIfTrue,
+        Call,
+        CallOutArgument,
         Ceiling,
         Clamp,
         ClampU32,

Ryujinx.Graphics.Shader/IntermediateRepresentation/OperandHelper.cs

@@ -5,6 +5,11 @@ namespace Ryujinx.Graphics.Shader.IntermediateRepresentation
 {
     static class OperandHelper
     {
+        public static Operand Argument(int value)
+        {
+            return new Operand(OperandType.Argument, value);
+        }
+
         public static Operand Attribute(int value)
         {
             return new Operand(OperandType.Attribute, value);

Ryujinx.Graphics.Shader/IntermediateRepresentation/OperandType.cs

@@ -2,6 +2,7 @@ namespace Ryujinx.Graphics.Shader.IntermediateRepresentation
 {
     enum OperandType
     {
+        Argument,
         Attribute,
         Constant,
         ConstantBuffer,

Ryujinx.Graphics.Shader/IntermediateRepresentation/Operation.cs

@@ -48,6 +48,25 @@ namespace Ryujinx.Graphics.Shader.IntermediateRepresentation
             Index = index;
         }
 
+        public void AppendOperands(params Operand[] operands)
+        {
+            int startIndex = _sources.Length;
+
+            Array.Resize(ref _sources, startIndex + operands.Length);
+
+            for (int index = 0; index < operands.Length; index++)
+            {
+                Operand source = operands[index];
+
+                if (source.Type == OperandType.LocalVariable)
+                {
+                    source.UseOps.Add(this);
+                }
+
+                _sources[startIndex + index] = source;
+            }
+        }
+
         private Operand AssignDest(Operand dest)
         {
             if (dest != null && dest.Type == OperandType.LocalVariable)