1 files changed, 58 insertions, 0 deletions
diff --git a/src/video_core/shader/decode/float_set.cpp b/src/video_core/shader/decode/float_set.cpp
new file mode 100644
index 000000000..ba846f1bd
--- /dev/null
+++ b/src/video_core/shader/decode/float_set.cpp
@@ -0,0 +1,58 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "video_core/engines/shader_bytecode.h"
+#include "video_core/shader/shader_ir.h"
+
+namespace VideoCommon::Shader {
+
+using Tegra::Shader::Instruction;
+using Tegra::Shader::OpCode;
+
+u32 ShaderIR::DecodeFloatSet(BasicBlock& bb, const BasicBlock& code, u32 pc) {
+    const Instruction instr = {program_code[pc]};
+    const auto opcode = OpCode::Decode(instr);
+
+    const Node op_a = GetOperandAbsNegFloat(GetRegister(instr.gpr8), instr.fset.abs_a != 0,
+                                            instr.fset.neg_a != 0);
+
+    Node op_b = [&]() {
+        if (instr.is_b_imm) {
+            return GetImmediate19(instr);
+        } else if (instr.is_b_gpr) {
+            return GetRegister(instr.gpr20);
+        } else {
+            return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.offset);
+        }
+    }();
+
+    op_b = GetOperandAbsNegFloat(op_b, instr.fset.abs_b != 0, instr.fset.neg_b != 0);
+
+    // The fset instruction sets a register to 1.0 or -1 (depending on the bf bit) if the
+    // condition is true, and to 0 otherwise.
+    const Node second_pred = GetPredicate(instr.fset.pred39, instr.fset.neg_pred != 0);
+
+    const OperationCode combiner = GetPredicateCombiner(instr.fset.op);
+    const Node first_pred = GetPredicateComparisonFloat(instr.fset.cond, op_a, op_b);
+
+    const Node predicate = Operation(combiner, first_pred, second_pred);
+
+    const Node true_value = instr.fset.bf ? Immediate(1.0f) : Immediate(-1);
+    const Node false_value = instr.fset.bf ? Immediate(0.0f) : Immediate(0);
+    const Node value =
+        Operation(OperationCode::Select, PRECISE, predicate, true_value, false_value);
+
+    if (instr.fset.bf) {
+        SetInternalFlagsFromFloat(bb, value, instr.generates_cc);
+    } else {
+        SetInternalFlagsFromInteger(bb, value, instr.generates_cc);
+    }
+    SetRegister(bb, instr.gpr0, value);
+
+    return pc;
+}
+
+} // namespace VideoCommon::Shader
+\ No newline at end of file