// Copyright (c) 2015-2016 The Khronos Group 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 "ext_inst.h"

#include <cassert>
#include <cstring>

#include "spirv/1.0/GLSL.std.450.h"
#include "spirv/1.0/OpenCL.std.h"
#include "spirv_definition.h"

#include "macro.h"

static const spv_ext_inst_desc_t glslStd450Entries_1_0[] = {
#include "glsl.std.450.insts-1.0.inc"
};

static const spv_ext_inst_desc_t openclEntries_1_0[] = {
#include "opencl.std.insts-1.0.inc"
};

spv_result_t spvExtInstTableGet(spv_ext_inst_table* pExtInstTable,
                                spv_target_env env) {
  if (!pExtInstTable) return SPV_ERROR_INVALID_POINTER;

  static const spv_ext_inst_group_t groups_1_0[] = {
      {SPV_EXT_INST_TYPE_GLSL_STD_450, ARRAY_SIZE(glslStd450Entries_1_0),
       glslStd450Entries_1_0},
      {SPV_EXT_INST_TYPE_OPENCL_STD, ARRAY_SIZE(openclEntries_1_0),
       openclEntries_1_0},
  };

  static const spv_ext_inst_table_t table_1_0 = {ARRAY_SIZE(groups_1_0),
                                                 groups_1_0};

  switch (env) {
    // The extended instruction sets are all version 1.0 so far.
    case SPV_ENV_UNIVERSAL_1_0:
    case SPV_ENV_VULKAN_1_0:
    case SPV_ENV_UNIVERSAL_1_1:
    case SPV_ENV_OPENCL_2_1:
    case SPV_ENV_OPENCL_2_2:
    case SPV_ENV_OPENGL_4_0:
    case SPV_ENV_OPENGL_4_1:
    case SPV_ENV_OPENGL_4_2:
    case SPV_ENV_OPENGL_4_3:
    case SPV_ENV_OPENGL_4_5:
      *pExtInstTable = &table_1_0;
      return SPV_SUCCESS;
    default:
      assert(0 && "Unknown spv_target_env in spvExtInstTableGet()");
      return SPV_ERROR_INVALID_TABLE;
  }
}

spv_ext_inst_type_t spvExtInstImportTypeGet(const char* name) {
  // The names are specified by the respective extension instruction
  // specifications.
  if (!strcmp("GLSL.std.450", name)) {
    return SPV_EXT_INST_TYPE_GLSL_STD_450;
  }
  if (!strcmp("OpenCL.std", name)) {
    return SPV_EXT_INST_TYPE_OPENCL_STD;
  }
  return SPV_EXT_INST_TYPE_NONE;
}

spv_result_t spvExtInstTableNameLookup(const spv_ext_inst_table table,
                                       const spv_ext_inst_type_t type,
                                       const char* name,
                                       spv_ext_inst_desc* pEntry) {
  if (!table) return SPV_ERROR_INVALID_TABLE;
  if (!pEntry) return SPV_ERROR_INVALID_POINTER;

  for (uint32_t groupIndex = 0; groupIndex < table->count; groupIndex++) {
    const auto& group = table->groups[groupIndex];
    if (type != group.type) continue;
    for (uint32_t index = 0; index < group.count; index++) {
      const auto& entry = group.entries[index];
      if (!strcmp(name, entry.name)) {
        *pEntry = &entry;
        return SPV_SUCCESS;
      }
    }
  }

  return SPV_ERROR_INVALID_LOOKUP;
}

spv_result_t spvExtInstTableValueLookup(const spv_ext_inst_table table,
                                        const spv_ext_inst_type_t type,
                                        const uint32_t value,
                                        spv_ext_inst_desc* pEntry) {
  if (!table) return SPV_ERROR_INVALID_TABLE;
  if (!pEntry) return SPV_ERROR_INVALID_POINTER;

  for (uint32_t groupIndex = 0; groupIndex < table->count; groupIndex++) {
    const auto& group = table->groups[groupIndex];
    if (type != group.type) continue;
    for (uint32_t index = 0; index < group.count; index++) {
      const auto& entry = group.entries[index];
      if (value == entry.ext_inst) {
        *pEntry = &entry;
        return SPV_SUCCESS;
      }
    }
  }

  return SPV_ERROR_INVALID_LOOKUP;
}