2 files changed, 31 insertions, 2 deletions

diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h
index c158ffed2..29d88192e 100644
--- a/src/video_core/engines/shader_bytecode.h
+++ b/src/video_core/engines/shader_bytecode.h
@@ -216,7 +216,7 @@ union Instruction {
 
     union {
         BitField<20, 19, u64> imm20_19;
-        BitField<20, 32, u64> imm20_32;
+        BitField<20, 32, s64> imm20_32;
         BitField<45, 1, u64> negate_b;
         BitField<46, 1, u64> abs_a;
         BitField<48, 1, u64> negate_a;
@@ -246,7 +246,7 @@ union Instruction {
 
         float GetImm20_32() const {
             float result{};
-            u32 imm{static_cast<u32>(imm20_32)};
+            s32 imm{static_cast<s32>(imm20_32)};
             std::memcpy(&result, &imm, sizeof(imm));
             return result;
         }
@@ -270,6 +270,11 @@ union Instruction {
     } alu_integer;
 
     union {
+        BitField<54, 1, u64> saturate;
+        BitField<56, 1, u64> negate_a;
+    } iadd32i;
+
+    union {
         BitField<20, 8, u64> shift_position;
         BitField<28, 8, u64> shift_length;
         BitField<48, 1, u64> negate_b;
@@ -450,6 +455,7 @@ public:
         IADD_C,
         IADD_R,
         IADD_IMM,
+        IADD32I,
         ISCADD_C, // Scale and Add
         ISCADD_R,
         ISCADD_IMM,
@@ -509,6 +515,7 @@ public:
         Trivial,
         Arithmetic,
         ArithmeticInteger,
+        ArithmeticIntegerImmediate,
         Bfe,
         Logic,
         Shift,
@@ -641,6 +648,7 @@ private:
             INST("0100110000010---", Id::IADD_C, Type::ArithmeticInteger, "IADD_C"),
             INST("0101110000010---", Id::IADD_R, Type::ArithmeticInteger, "IADD_R"),
             INST("0011100-00010---", Id::IADD_IMM, Type::ArithmeticInteger, "IADD_IMM"),
+            INST("0001110---------", Id::IADD32I, Type::ArithmeticIntegerImmediate, "IADD32I"),
             INST("0100110000011---", Id::ISCADD_C, Type::ArithmeticInteger, "ISCADD_C"),
             INST("0101110000011---", Id::ISCADD_R, Type::ArithmeticInteger, "ISCADD_R"),
             INST("0011100-00011---", Id::ISCADD_IMM, Type::ArithmeticInteger, "ISCADD_IMM"),
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
index b94b79384..7ce150fda 100644
--- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -1003,6 +1003,27 @@ private:
             break;
         }
 
+        case OpCode::Type::ArithmeticIntegerImmediate: {
+            std::string op_a = regs.GetRegisterAsInteger(instr.gpr8);
+
+            if (instr.iadd32i.negate_a)
+                op_a = '-' + op_a;
+
+            std::string op_b = '(' + std::to_string(instr.alu.imm20_32.Value()) + ')';
+
+            switch (opcode->GetId()) {
+            case OpCode::Id::IADD32I:
+                regs.SetRegisterToInteger(instr.gpr0, true, 0, op_a + " + " + op_b, 1, 1,
+                                          instr.iadd32i.saturate != 0);
+                break;
+            default: {
+                NGLOG_CRITICAL(HW_GPU, "Unhandled ArithmeticIntegerImmediate instruction: {}",
+                               opcode->GetName());
+                UNREACHABLE();
+            }
+            }
+            break;
+        }
         case OpCode::Type::ArithmeticInteger: {
             std::string op_a = regs.GetRegisterAsInteger(instr.gpr8);