// Copyright (c) 2017 Valve Corporation
// Copyright (c) 2017 LunarG Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <string>
#include <vector>

#include "gmock/gmock.h"
#include "test/opt/pass_fixture.h"
#include "test/opt/pass_utils.h"

namespace spvtools {
namespace opt {
namespace {

// Returns the initial part of the assembly text for a valid
// SPIR-V module, including instructions prior to decorations.
std::string PreambleAssembly() {
  return
      R"(OpCapability Shader
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %hue %saturation %value
OpExecutionMode %main OriginUpperLeft
OpName %main "main"
OpName %void_fn "void_fn"
OpName %hue "hue"
OpName %saturation "saturation"
OpName %value "value"
OpName %entry "entry"
OpName %Point "Point"
OpName %Camera "Camera"
)";
}

// Retuns types
std::string TypesAndFunctionsAssembly() {
  return
      R"(%void = OpTypeVoid
%void_fn = OpTypeFunction %void
%float = OpTypeFloat 32
%Point = OpTypeStruct %float %float %float
%Camera = OpTypeStruct %float %float
%_ptr_Input_float = OpTypePointer Input %float
%hue = OpVariable %_ptr_Input_float Input
%saturation = OpVariable %_ptr_Input_float Input
%value = OpVariable %_ptr_Input_float Input
%main = OpFunction %void None %void_fn
%entry = OpLabel
OpReturn
OpFunctionEnd
)";
}

struct FlattenDecorationCase {
  // Names and decorations before the pass.
  std::string input;
  // Names and decorations after the pass.
  std::string expected;
};

using FlattenDecorationTest =
    PassTest<::testing::TestWithParam<FlattenDecorationCase>>;

TEST_P(FlattenDecorationTest, TransformsDecorations) {
  const auto before =
      PreambleAssembly() + GetParam().input + TypesAndFunctionsAssembly();
  const auto after =
      PreambleAssembly() + GetParam().expected + TypesAndFunctionsAssembly();

  SinglePassRunAndCheck<FlattenDecorationPass>(before, after, false, true);
}

INSTANTIATE_TEST_CASE_P(NoUses, FlattenDecorationTest,
                        ::testing::ValuesIn(std::vector<FlattenDecorationCase>{
                            // No OpDecorationGroup
                            {"", ""},

                            // OpDecorationGroup without any uses, and
                            // no OpName.
                            {"%group = OpDecorationGroup\n", ""},

                            // OpDecorationGroup without any uses, and
                            // with OpName targeting it. Proves you must
                            // remove the names as well.
                            {"OpName %group \"group\"\n"
                             "%group = OpDecorationGroup\n",
                             ""},

                            // OpDecorationGroup with decorations that
                            // target it, but no uses in OpGroupDecorate
                            // or OpGroupMemberDecorate instructions.
                            {"OpDecorate %group Flat\n"
                             "OpDecorate %group NoPerspective\n"
                             "%group = OpDecorationGroup\n",
                             ""},
                        }), );

INSTANTIATE_TEST_CASE_P(OpGroupDecorate, FlattenDecorationTest,
                        ::testing::ValuesIn(std::vector<FlattenDecorationCase>{
                            // One OpGroupDecorate
                            {"OpName %group \"group\"\n"
                             "OpDecorate %group Flat\n"
                             "OpDecorate %group NoPerspective\n"
                             "%group = OpDecorationGroup\n"
                             "OpGroupDecorate %group %hue %saturation\n",
                             "OpDecorate %hue Flat\n"
                             "OpDecorate %saturation Flat\n"
                             "OpDecorate %hue NoPerspective\n"
                             "OpDecorate %saturation NoPerspective\n"},
                            // Multiple OpGroupDecorate
                            {"OpName %group \"group\"\n"
                             "OpDecorate %group Flat\n"
                             "OpDecorate %group NoPerspective\n"
                             "%group = OpDecorationGroup\n"
                             "OpGroupDecorate %group %hue %value\n"
                             "OpGroupDecorate %group %saturation\n",
                             "OpDecorate %hue Flat\n"
                             "OpDecorate %value Flat\n"
                             "OpDecorate %saturation Flat\n"
                             "OpDecorate %hue NoPerspective\n"
                             "OpDecorate %value NoPerspective\n"
                             "OpDecorate %saturation NoPerspective\n"},
                            // Two group decorations, interleaved
                            {"OpName %group0 \"group0\"\n"
                             "OpName %group1 \"group1\"\n"
                             "OpDecorate %group0 Flat\n"
                             "OpDecorate %group1 NoPerspective\n"
                             "%group0 = OpDecorationGroup\n"
                             "%group1 = OpDecorationGroup\n"
                             "OpGroupDecorate %group0 %hue %value\n"
                             "OpGroupDecorate %group1 %saturation\n",
                             "OpDecorate %hue Flat\n"
                             "OpDecorate %value Flat\n"
                             "OpDecorate %saturation NoPerspective\n"},
                            // Decoration with operands
                            {"OpName %group \"group\"\n"
                             "OpDecorate %group Location 42\n"
                             "%group = OpDecorationGroup\n"
                             "OpGroupDecorate %group %hue %saturation\n",
                             "OpDecorate %hue Location 42\n"
                             "OpDecorate %saturation Location 42\n"},
                        }), );

INSTANTIATE_TEST_CASE_P(OpGroupMemberDecorate, FlattenDecorationTest,
                        ::testing::ValuesIn(std::vector<FlattenDecorationCase>{
                            // One OpGroupMemberDecorate
                            {"OpName %group \"group\"\n"
                             "OpDecorate %group Flat\n"
                             "OpDecorate %group Offset 16\n"
                             "%group = OpDecorationGroup\n"
                             "OpGroupMemberDecorate %group %Point 1\n",
                             "OpMemberDecorate %Point 1 Flat\n"
                             "OpMemberDecorate %Point 1 Offset 16\n"},
                            // Multiple OpGroupMemberDecorate using the same
                            // decoration group.
                            {"OpName %group \"group\"\n"
                             "OpDecorate %group Flat\n"
                             "OpDecorate %group NoPerspective\n"
                             "OpDecorate %group Offset 8\n"
                             "%group = OpDecorationGroup\n"
                             "OpGroupMemberDecorate %group %Point 2\n"
                             "OpGroupMemberDecorate %group %Camera 1\n",
                             "OpMemberDecorate %Point 2 Flat\n"
                             "OpMemberDecorate %Camera 1 Flat\n"
                             "OpMemberDecorate %Point 2 NoPerspective\n"
                             "OpMemberDecorate %Camera 1 NoPerspective\n"
                             "OpMemberDecorate %Point 2 Offset 8\n"
                             "OpMemberDecorate %Camera 1 Offset 8\n"},
                            // Two groups of member decorations, interleaved.
                            // Decoration is with and without operands.
                            {"OpName %group0 \"group0\"\n"
                             "OpName %group1 \"group1\"\n"
                             "OpDecorate %group0 Flat\n"
                             "OpDecorate %group0 Offset 8\n"
                             "OpDecorate %group1 NoPerspective\n"
                             "OpDecorate %group1 Offset 16\n"
                             "%group0 = OpDecorationGroup\n"
                             "%group1 = OpDecorationGroup\n"
                             "OpGroupMemberDecorate %group0 %Point 0\n"
                             "OpGroupMemberDecorate %group1 %Point 2\n",
                             "OpMemberDecorate %Point 0 Flat\n"
                             "OpMemberDecorate %Point 0 Offset 8\n"
                             "OpMemberDecorate %Point 2 NoPerspective\n"
                             "OpMemberDecorate %Point 2 Offset 16\n"},
                        }), );

INSTANTIATE_TEST_CASE_P(UnrelatedDecorations, FlattenDecorationTest,
                        ::testing::ValuesIn(std::vector<FlattenDecorationCase>{
                            // A non-group non-member decoration is untouched.
                            {"OpDecorate %hue Centroid\n"
                             "OpDecorate %saturation Flat\n",
                             "OpDecorate %hue Centroid\n"
                             "OpDecorate %saturation Flat\n"},
                            // A non-group member decoration is untouched.
                            {"OpMemberDecorate %Point 0 Offset 0\n"
                             "OpMemberDecorate %Point 1 Offset 4\n"
                             "OpMemberDecorate %Point 1 Flat\n",
                             "OpMemberDecorate %Point 0 Offset 0\n"
                             "OpMemberDecorate %Point 1 Offset 4\n"
                             "OpMemberDecorate %Point 1 Flat\n"},
                            // A non-group non-member decoration survives any
                            // replacement of group decorations.
                            {"OpName %group \"group\"\n"
                             "OpDecorate %group Flat\n"
                             "OpDecorate %hue Centroid\n"
                             "OpDecorate %group NoPerspective\n"
                             "%group = OpDecorationGroup\n"
                             "OpGroupDecorate %group %hue %saturation\n",
                             "OpDecorate %hue Flat\n"
                             "OpDecorate %saturation Flat\n"
                             "OpDecorate %hue Centroid\n"
                             "OpDecorate %hue NoPerspective\n"
                             "OpDecorate %saturation NoPerspective\n"},
                            // A non-group member decoration survives any
                            // replacement of group decorations.
                            {"OpDecorate %group Offset 0\n"
                             "OpDecorate %group Flat\n"
                             "OpMemberDecorate %Point 1 Offset 4\n"
                             "%group = OpDecorationGroup\n"
                             "OpGroupMemberDecorate %group %Point 0\n",
                             "OpMemberDecorate %Point 0 Offset 0\n"
                             "OpMemberDecorate %Point 0 Flat\n"
                             "OpMemberDecorate %Point 1 Offset 4\n"},
                        }), );

}  // namespace
}  // namespace opt
}  // namespace spvtools