diff options
Diffstat (limited to 'src/video_core/shader/decode/video.cpp')
| -rw-r--r-- | src/video_core/shader/decode/video.cpp | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/video_core/shader/decode/video.cpp b/src/video_core/shader/decode/video.cpp new file mode 100644 index 000000000..c3432356d --- /dev/null +++ b/src/video_core/shader/decode/video.cpp @@ -0,0 +1,111 @@ +// 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; +using Tegra::Shader::Pred; +using Tegra::Shader::VideoType; +using Tegra::Shader::VmadShr; + +u32 ShaderIR::DecodeVideo(BasicBlock& bb, const BasicBlock& code, u32 pc) { + const Instruction instr = {program_code[pc]}; + const auto opcode = OpCode::Decode(instr); + + 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); + const Node op_b = [&]() { + if (instr.video.use_register_b) { + return GetVideoOperand(GetRegister(instr.gpr20), instr.video.is_byte_chunk_b, + instr.video.signed_b, instr.video.type_b, + instr.video.byte_height_b); + } + if (instr.video.signed_b) { + const auto imm = static_cast<s16>(instr.alu.GetImm20_16()); + return Immediate(static_cast<u32>(imm)); + } else { + return Immediate(instr.alu.GetImm20_16()); + } + }(); + + switch (opcode->get().GetId()) { + case OpCode::Id::VMAD: { + const bool result_signed = instr.video.signed_a == 1 || instr.video.signed_b == 1; + const Node op_c = GetRegister(instr.gpr39); + + Node value = SignedOperation(OperationCode::IMul, result_signed, NO_PRECISE, op_a, op_b); + value = SignedOperation(OperationCode::IAdd, result_signed, NO_PRECISE, value, op_c); + + if (instr.vmad.shr == VmadShr::Shr7 || instr.vmad.shr == VmadShr::Shr15) { + const Node shift = Immediate(instr.vmad.shr == VmadShr::Shr7 ? 7 : 15); + value = + SignedOperation(OperationCode::IArithmeticShiftRight, result_signed, value, shift); + } + + SetInternalFlagsFromInteger(bb, value, instr.generates_cc); + SetRegister(bb, instr.gpr0, value); + break; + } + case OpCode::Id::VSETP: { + // We can't use the constant predicate as destination. + ASSERT(instr.vsetp.pred3 != static_cast<u64>(Pred::UnusedIndex)); + + const bool sign = instr.video.signed_a == 1 || instr.video.signed_b == 1; + const Node first_pred = GetPredicateComparisonInteger(instr.vsetp.cond, sign, op_a, op_b); + const Node second_pred = GetPredicate(instr.vsetp.pred39, false); + + const OperationCode combiner = GetPredicateCombiner(instr.vsetp.op); + + // Set the primary predicate to the result of Predicate OP SecondPredicate + SetPredicate(bb, instr.vsetp.pred3, Operation(combiner, first_pred, second_pred)); + + if (instr.vsetp.pred0 != static_cast<u64>(Pred::UnusedIndex)) { + // Set the secondary predicate to the result of !Predicate OP SecondPredicate, + // if enabled + const Node negate_pred = Operation(OperationCode::LogicalNegate, first_pred); + SetPredicate(bb, instr.vsetp.pred0, Operation(combiner, negate_pred, second_pred)); + } + break; + } + default: + UNIMPLEMENTED_MSG("Unhandled video instruction: {}", opcode->get().GetName()); + } + + return pc; +} + +Node ShaderIR::GetVideoOperand(Node op, bool is_chunk, bool is_signed, + Tegra::Shader::VideoType type, u64 byte_height) { + if (!is_chunk) { + return BitfieldExtract(op, static_cast<u32>(byte_height * 8), 8); + } + const Node zero = Immediate(0); + + switch (type) { + case Tegra::Shader::VideoType::Size16_Low: + return BitfieldExtract(op, 0, 16); + case Tegra::Shader::VideoType::Size16_High: + return BitfieldExtract(op, 16, 16); + case Tegra::Shader::VideoType::Size32: + // TODO(Rodrigo): From my hardware tests it becomes a bit "mad" when this type is used + // (1 * 1 + 0 == 0x5b800000). Until a better explanation is found: abort. + UNIMPLEMENTED(); + return zero; + case Tegra::Shader::VideoType::Invalid: + UNREACHABLE_MSG("Invalid instruction encoding"); + return zero; + default: + UNREACHABLE(); + return zero; + } +} + +} // namespace VideoCommon::Shader
\ No newline at end of file |