From 68a9505d8a1d00c6ba2739bc0af3069cf87b9b84 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Wed, 24 Mar 2021 01:33:45 -0300
Subject: shader: Implement NDC [-1, 1], attribute types and default varying
 initialization

---
 src/shader_recompiler/frontend/ir/ir_emitter.cpp                  | 8 ++++++++
 src/shader_recompiler/frontend/ir/ir_emitter.h                    | 3 +++
 src/shader_recompiler/frontend/ir/microinstruction.cpp            | 2 ++
 src/shader_recompiler/frontend/ir/opcodes.inc                     | 4 ++++
 .../frontend/maxwell/structured_control_flow.cpp                  | 7 ++++++-
 5 files changed, 23 insertions(+), 1 deletion(-)

(limited to 'src/shader_recompiler/frontend')

diff --git a/src/shader_recompiler/frontend/ir/ir_emitter.cpp b/src/shader_recompiler/frontend/ir/ir_emitter.cpp
index ff2970125..ce610799a 100644
--- a/src/shader_recompiler/frontend/ir/ir_emitter.cpp
+++ b/src/shader_recompiler/frontend/ir/ir_emitter.cpp
@@ -92,6 +92,14 @@ void IREmitter::DemoteToHelperInvocation(Block* continue_label) {
     Inst(Opcode::DemoteToHelperInvocation, continue_label);
 }
 
+void IREmitter::Prologue() {
+    Inst(Opcode::Prologue);
+}
+
+void IREmitter::Epilogue() {
+    Inst(Opcode::Epilogue);
+}
+
 U32 IREmitter::GetReg(IR::Reg reg) {
     return Inst<U32>(Opcode::GetRegister, reg);
 }
diff --git a/src/shader_recompiler/frontend/ir/ir_emitter.h b/src/shader_recompiler/frontend/ir/ir_emitter.h
index 1708be3ef..39109b0de 100644
--- a/src/shader_recompiler/frontend/ir/ir_emitter.h
+++ b/src/shader_recompiler/frontend/ir/ir_emitter.h
@@ -39,6 +39,9 @@ public:
     void Return();
     void DemoteToHelperInvocation(Block* continue_label);
 
+    void Prologue();
+    void Epilogue();
+
     [[nodiscard]] U32 GetReg(IR::Reg reg);
     void SetReg(IR::Reg reg, const U32& value);
 
diff --git a/src/shader_recompiler/frontend/ir/microinstruction.cpp b/src/shader_recompiler/frontend/ir/microinstruction.cpp
index 21b7d8a9f..ba3968056 100644
--- a/src/shader_recompiler/frontend/ir/microinstruction.cpp
+++ b/src/shader_recompiler/frontend/ir/microinstruction.cpp
@@ -56,6 +56,8 @@ bool Inst::MayHaveSideEffects() const noexcept {
     case Opcode::SelectionMerge:
     case Opcode::Return:
     case Opcode::DemoteToHelperInvocation:
+    case Opcode::Prologue:
+    case Opcode::Epilogue:
     case Opcode::SetAttribute:
     case Opcode::SetAttributeIndexed:
     case Opcode::SetFragColor:
diff --git a/src/shader_recompiler/frontend/ir/opcodes.inc b/src/shader_recompiler/frontend/ir/opcodes.inc
index fe888b8b2..8945c7b04 100644
--- a/src/shader_recompiler/frontend/ir/opcodes.inc
+++ b/src/shader_recompiler/frontend/ir/opcodes.inc
@@ -15,6 +15,10 @@ OPCODE(SelectionMerge,                                      Void,           Labe
 OPCODE(Return,                                              Void,                                                                                           )
 OPCODE(DemoteToHelperInvocation,                            Void,           Label,                                                                          )
 
+// Special operations
+OPCODE(Prologue,                                            Void,                                                                                           )
+OPCODE(Epilogue,                                            Void,                                                                                           )
+
 // Context getters/setters
 OPCODE(GetRegister,                                         U32,            Reg,                                                                            )
 OPCODE(SetRegister,                                         Void,           Reg,            U32,                                                            )
diff --git a/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp b/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp
index cec03e73e..fdac1c95a 100644
--- a/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp
+++ b/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp
@@ -634,6 +634,9 @@ public:
         : stmt_pool{stmt_pool_}, inst_pool{inst_pool_}, block_pool{block_pool_}, env{env_},
           block_list{block_list_} {
         Visit(root_stmt, nullptr, nullptr);
+
+        IR::IREmitter ir{*block_list.front()};
+        ir.Prologue();
     }
 
 private:
@@ -734,7 +737,9 @@ private:
                     current_block = block_pool.Create(inst_pool);
                     block_list.push_back(current_block);
                 }
-                IR::IREmitter{*current_block}.Return();
+                IR::IREmitter ir{*current_block};
+                ir.Epilogue();
+                ir.Return();
                 current_block = nullptr;
                 break;
             }
-- 
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