3 files changed, 116 insertions, 0 deletions

diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h
index fcb2d7935..7400e1aa9 100644
--- a/src/video_core/engines/shader_bytecode.h
+++ b/src/video_core/engines/shader_bytecode.h
@@ -302,6 +302,23 @@ enum class VmadShr : u64 {
     Shr15 = 2,
 };
 
+enum class VmnmxType : u64 {
+    Bits8,
+    Bits16,
+    Bits32,
+};
+
+enum class VmnmxOperation : u64 {
+    Mrg_16H = 0,
+    Mrg_16L = 1,
+    Mrg_8B0 = 2,
+    Mrg_8B2 = 3,
+    Acc = 4,
+    Min = 5,
+    Max = 6,
+    Nop = 7,
+};
+
 enum class XmadMode : u64 {
     None = 0,
     CLo = 1,
@@ -1663,6 +1680,42 @@ union Instruction {
     } vmad;
 
     union {
+        BitField<54, 1, u64> is_dest_signed;
+        BitField<48, 1, u64> is_src_a_signed;
+        BitField<49, 1, u64> is_src_b_signed;
+        BitField<37, 2, u64> src_format_a;
+        BitField<29, 2, u64> src_format_b;
+        BitField<56, 1, u64> mx;
+        BitField<55, 1, u64> sat;
+        BitField<36, 2, u64> selector_a;
+        BitField<28, 2, u64> selector_b;
+        BitField<50, 1, u64> is_op_b_register;
+        BitField<51, 3, VmnmxOperation> operation;
+
+        VmnmxType SourceFormatA() const {
+            switch (src_format_a) {
+            case 0b11:
+                return VmnmxType::Bits32;
+            case 0b10:
+                return VmnmxType::Bits16;
+            default:
+                return VmnmxType::Bits8;
+            }
+        }
+
+        VmnmxType SourceFormatB() const {
+            switch (src_format_b) {
+            case 0b11:
+                return VmnmxType::Bits32;
+            case 0b10:
+                return VmnmxType::Bits16;
+            default:
+                return VmnmxType::Bits8;
+            }
+        }
+    } vmnmx;
+
+    union {
         BitField<20, 16, u64> imm20_16;
         BitField<35, 1, u64> high_b_rr; // used on RR
         BitField<36, 1, u64> product_shift_left;
@@ -1773,6 +1826,7 @@ public:
         MEMBAR,
         VMAD,
         VSETP,
+        VMNMX,
         FFMA_IMM, // Fused Multiply and Add
         FFMA_CR,
         FFMA_RC,
@@ -2078,6 +2132,7 @@ private:
             INST("1110111110011---", Id::MEMBAR, Type::Trivial, "MEMBAR"),
             INST("01011111--------", Id::VMAD, Type::Video, "VMAD"),
             INST("0101000011110---", Id::VSETP, Type::Video, "VSETP"),
+            INST("0011101---------", Id::VMNMX, Type::Video, "VMNMX"),
             INST("0011001-1-------", Id::FFMA_IMM, Type::Ffma, "FFMA_IMM"),
             INST("010010011-------", Id::FFMA_CR, Type::Ffma, "FFMA_CR"),
             INST("010100011-------", Id::FFMA_RC, Type::Ffma, "FFMA_RC"),
diff --git a/src/video_core/shader/decode/video.cpp b/src/video_core/shader/decode/video.cpp
index b047cf870..64ba60ea2 100644
--- a/src/video_core/shader/decode/video.cpp
+++ b/src/video_core/shader/decode/video.cpp
@@ -10,16 +10,24 @@
 
 namespace VideoCommon::Shader {
 
+using std::move;
 using Tegra::Shader::Instruction;
 using Tegra::Shader::OpCode;
 using Tegra::Shader::Pred;
 using Tegra::Shader::VideoType;
 using Tegra::Shader::VmadShr;
+using Tegra::Shader::VmnmxOperation;
+using Tegra::Shader::VmnmxType;
 
 u32 ShaderIR::DecodeVideo(NodeBlock& bb, u32 pc) {
     const Instruction instr = {program_code[pc]};
     const auto opcode = OpCode::Decode(instr);
 
+    if (opcode->get().GetId() == OpCode::Id::VMNMX) {
+        DecodeVMNMX(bb, instr);
+        return pc;
+    }
+
     const Node op_a =
         GetVideoOperand(GetRegister(instr.gpr8), instr.video.is_byte_chunk_a, instr.video.signed_a,
                         instr.video.type_a, instr.video.byte_height_a);
@@ -109,4 +117,54 @@ Node ShaderIR::GetVideoOperand(Node op, bool is_chunk, bool is_signed,
     }
 }
 
+void ShaderIR::DecodeVMNMX(NodeBlock& bb, Tegra::Shader::Instruction instr) {
+    UNIMPLEMENTED_IF(!instr.vmnmx.is_op_b_register);
+    UNIMPLEMENTED_IF(instr.vmnmx.SourceFormatA() != VmnmxType::Bits32);
+    UNIMPLEMENTED_IF(instr.vmnmx.SourceFormatB() != VmnmxType::Bits32);
+    UNIMPLEMENTED_IF(instr.vmnmx.is_src_a_signed != instr.vmnmx.is_src_b_signed);
+    UNIMPLEMENTED_IF(instr.vmnmx.sat);
+    UNIMPLEMENTED_IF(instr.generates_cc);
+
+    Node op_a = GetRegister(instr.gpr8);
+    Node op_b = GetRegister(instr.gpr20);
+    Node op_c = GetRegister(instr.gpr39);
+
+    const bool is_oper1_signed = instr.vmnmx.is_src_a_signed; // Stubbed
+    const bool is_oper2_signed = instr.vmnmx.is_dest_signed;
+
+    const auto operation_a = instr.vmnmx.mx ? OperationCode::IMax : OperationCode::IMin;
+    Node value = SignedOperation(operation_a, is_oper1_signed, move(op_a), move(op_b));
+
+    switch (instr.vmnmx.operation) {
+    case VmnmxOperation::Mrg_16H:
+        value = BitfieldInsert(move(op_c), move(value), 16, 16);
+        break;
+    case VmnmxOperation::Mrg_16L:
+        value = BitfieldInsert(move(op_c), move(value), 0, 16);
+        break;
+    case VmnmxOperation::Mrg_8B0:
+        value = BitfieldInsert(move(op_c), move(value), 0, 8);
+        break;
+    case VmnmxOperation::Mrg_8B2:
+        value = BitfieldInsert(move(op_c), move(value), 16, 8);
+        break;
+    case VmnmxOperation::Acc:
+        value = Operation(OperationCode::IAdd, move(value), move(op_c));
+        break;
+    case VmnmxOperation::Min:
+        value = SignedOperation(OperationCode::IMin, is_oper2_signed, move(value), move(op_c));
+        break;
+    case VmnmxOperation::Max:
+        value = SignedOperation(OperationCode::IMax, is_oper2_signed, move(value), move(op_c));
+        break;
+    case VmnmxOperation::Nop:
+        break;
+    default:
+        UNREACHABLE();
+        break;
+    }
+
+    SetRegister(bb, instr.gpr0, move(value));
+}
+
 } // namespace VideoCommon::Shader
diff --git a/src/video_core/shader/shader_ir.h b/src/video_core/shader/shader_ir.h
index 80fc9b82c..0f1ebef1b 100644
--- a/src/video_core/shader/shader_ir.h
+++ b/src/video_core/shader/shader_ir.h
@@ -350,6 +350,9 @@ private:
     /// Marks the usage of a input or output attribute.
     void MarkAttributeUsage(Tegra::Shader::Attribute::Index index, u64 element);
 
+    /// Decodes VMNMX instruction and inserts its code into the passed basic block.
+    void DecodeVMNMX(NodeBlock& bb, Tegra::Shader::Instruction instr);
+
     void WriteTexInstructionFloat(NodeBlock& bb, Tegra::Shader::Instruction instr,
                                   const Node4& components);