source/extensions.cpp

// Copyright (c) 2017 Google 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 "extensions.h"

#include <cassert>
#include <sstream>
#include <string>

namespace libspirv {

std::string GetExtensionString(const spv_parsed_instruction_t* inst) {
  if (inst->opcode != SpvOpExtension)
    return "ERROR_not_op_extension";

  assert(inst->num_operands == 1);

  const auto& operand = inst->operands[0];
  assert(operand.type == SPV_OPERAND_TYPE_LITERAL_STRING);
  assert(inst->num_words > operand.offset);

  return reinterpret_cast<const char*>(inst->words + operand.offset);
}

bool ParseSpvExtensionFromString(const std::string& str, Extension* extension) {
  if (str == "SPV_KHR_shader_ballot") {
    *extension = Extension::kSPV_KHR_shader_ballot;
  } else if (str == "SPV_KHR_shader_draw_parameters") {
    *extension = Extension::kSPV_KHR_shader_draw_parameters;
  } else if (str == "SPV_KHR_subgroup_vote") {
    *extension = Extension::kSPV_KHR_subgroup_vote;
  } else if (str == "SPV_KHR_16bit_storage") {
    *extension = Extension::kSPV_KHR_16bit_storage;
  } else if (str == "SPV_KHR_device_group") {
    *extension = Extension::kSPV_KHR_device_group;
  } else if (str == "SPV_KHR_multiview") {
    *extension = Extension::kSPV_KHR_multiview;
  } else if (str == "SPV_NV_sample_mask_override_coverage") {
    *extension = Extension::kSPV_NV_sample_mask_override_coverage;
  } else if (str == "SPV_NV_geometry_shader_passthrough") {
    *extension = Extension::kSPV_NV_geometry_shader_passthrough;
  } else if (str == "SPV_NV_viewport_array2") {
    *extension = Extension::kSPV_NV_viewport_array2;
  } else if (str == "SPV_NV_stereo_view_rendering") {
    *extension = Extension::kSPV_NV_stereo_view_rendering;
  } else if (str == "SPV_NVX_multiview_per_view_attributes") {
    *extension = Extension::kSPV_NVX_multiview_per_view_attributes;
  } else {
    return false;
  }

  return true;
}

std::string ExtensionToString(Extension extension) {
  switch (extension) {
    case Extension::kSPV_KHR_shader_ballot:
      return "SPV_KHR_shader_ballot";
    case Extension::kSPV_KHR_shader_draw_parameters:
      return "SPV_KHR_shader_draw_parameters";
    case Extension::kSPV_KHR_subgroup_vote:
      return "SPV_KHR_subgroup_vote";
    case Extension::kSPV_KHR_16bit_storage:
      return "SPV_KHR_16bit_storage";
    case Extension::kSPV_KHR_device_group:
      return "SPV_KHR_device_group";
    case Extension::kSPV_KHR_multiview:
      return "SPV_KHR_multiview";
    case Extension::kSPV_NV_sample_mask_override_coverage:
      return "SPV_NV_sample_mask_override_coverage";
    case Extension::kSPV_NV_geometry_shader_passthrough:
      return "SPV_NV_geometry_shader_passthrough";
    case Extension::kSPV_NV_viewport_array2:
      return "SPV_NV_viewport_array2";
    case Extension::kSPV_NV_stereo_view_rendering:
      return "SPV_NV_stereo_view_rendering";
    case Extension::kSPV_NVX_multiview_per_view_attributes:
      return "SPV_NVX_multiview_per_view_attributes";
  }

  return "ERROR_unknown_extension";
}

std::string ExtensionSetToString(const ExtensionSet& extensions) {
  std::stringstream ss;
  extensions.ForEach([&ss](Extension ext) {
      ss << ExtensionToString(ext) << " ";
  });
  return ss.str();
}

}  // namespace libspirv