1 // Copyright 2018 yuzu Emulator Project
2 // Licensed under GPLv2 or any later version
3 // Refer to the license.txt file included.
4
5 #include "common/common_types.h"
6 #include "video_core/engines/shader_bytecode.h"
7 #include "video_core/shader/node_helper.h"
8 #include "video_core/shader/shader_ir.h"
9
10 namespace VideoCommon::Shader {
11
12 using Tegra::Shader::Instruction;
13 using Tegra::Shader::OpCode;
14
DecodeIntegerSet(NodeBlock & bb,u32 pc)15 u32 ShaderIR::DecodeIntegerSet(NodeBlock& bb, u32 pc) {
16 const Instruction instr = {program_code[pc]};
17
18 const Node op_a = GetRegister(instr.gpr8);
19 const Node op_b = [&]() {
20 if (instr.is_b_imm) {
21 return Immediate(instr.alu.GetSignedImm20_20());
22 } else if (instr.is_b_gpr) {
23 return GetRegister(instr.gpr20);
24 } else {
25 return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
26 }
27 }();
28
29 // The iset instruction sets a register to 1.0 or -1 (depending on the bf bit) if the condition
30 // is true, and to 0 otherwise.
31 const Node second_pred = GetPredicate(instr.iset.pred39, instr.iset.neg_pred != 0);
32 const Node first_pred =
33 GetPredicateComparisonInteger(instr.iset.cond, instr.iset.is_signed, op_a, op_b);
34
35 const OperationCode combiner = GetPredicateCombiner(instr.iset.op);
36
37 const Node predicate = Operation(combiner, first_pred, second_pred);
38
39 const Node true_value = instr.iset.bf ? Immediate(1.0f) : Immediate(-1);
40 const Node false_value = instr.iset.bf ? Immediate(0.0f) : Immediate(0);
41 const Node value =
42 Operation(OperationCode::Select, PRECISE, predicate, true_value, false_value);
43
44 SetRegister(bb, instr.gpr0, value);
45
46 return pc;
47 }
48
49 } // namespace VideoCommon::Shader
50