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- /*
- * Copyright (C) 2017-2019 Christopher J. Howard
- *
- * This file is part of Antkeeper Source Code.
- *
- * Antkeeper Source Code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Antkeeper Source Code is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Antkeeper Source Code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include "resource-loader.hpp"
- #include "resource-manager.hpp"
- #include <algorithm>
- #include <stdexcept>
- #include <sstream>
- #include <vector>
-
- #include <emergent/emergent.hpp>
- using namespace Emergent;
-
- static bool loadShaderInt(ShaderInt* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- int value;
- std::stringstream stream;
- stream << elements[i][0];
- stream >> value;
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- static bool loadShaderFloat(ShaderFloat* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- float value;
- std::stringstream stream;
- stream << elements[i][0];
- stream >> value;
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- static bool loadShaderVector2(ShaderVector2* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- Vector2 value;
-
- for (int j = 0; j < 2; ++j)
- {
- std::stringstream stream;
- stream << elements[i][j];
- stream >> value[j];
- }
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- static bool loadShaderVector3(ShaderVector3* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- Vector3 value;
-
- for (int j = 0; j < 3; ++j)
- {
- std::stringstream stream;
- stream << elements[i][j];
- stream >> value[j];
- }
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- static bool loadShaderVector4(ShaderVector4* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- Vector4 value;
-
- for (int j = 0; j < 4; ++j)
- {
- std::stringstream stream;
- stream << elements[i][j];
- stream >> value[j];
- }
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- static bool loadShaderMatrix3(ShaderMatrix3* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- Matrix3 value;
-
- for (int j = 0; j < 3; ++j)
- {
- for (int k = 0; k < 3; ++k)
- {
- std::stringstream stream;
- stream << elements[i][k * 3 + j];
- stream >> value[j][k];
- }
- }
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- static bool loadShaderMatrix4(ShaderMatrix4* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- Matrix4 value;
-
- for (int j = 0; j < 4; ++j)
- {
- for (int k = 0; k < 4; ++k)
- {
- std::stringstream stream;
- stream << elements[i][k * 4 + j];
- stream >> value[j][k];
- }
- }
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- static bool loadShaderTexture2D(ResourceManager* resourceManager, ShaderTexture2D* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- std::string filename;
- std::stringstream stream;
- stream << elements[i][0];
- stream >> filename;
-
- Texture2D* value = resourceManager->load<Texture2D>(filename);
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- static bool loadShaderTextureCube(ResourceManager* resourceManager, ShaderTextureCube* variable, const std::vector<std::vector<std::string>>& elements)
- {
- for (int i = 0; i < elements.size(); ++i)
- {
- std::string filename;
- std::stringstream stream;
- stream << elements[i][0];
- stream >> filename;
-
- TextureCube* value = resourceManager->load<TextureCube>(filename);
-
- variable->setValue(i, value);
- }
-
- return true;
- }
-
- template <>
- Material* ResourceLoader<Material>::load(ResourceManager* resourceManager, std::istream* is)
- {
- // Allocate new material
- Material* material = new Material();
-
- std::string line;
- std::size_t lineNumber = 0;
- const std::string whitespace = " \t\r\n";
-
- // Parse lines
- while (is->good() && std::getline(*is, line))
- {
- if (is->bad() || is->fail())
- {
- break;
- }
-
- // Increment current line number
- ++lineNumber;
-
- // Skip empty lines
- if (line.empty())
- {
- continue;
- }
-
- // Find position of first character in the command
- std::size_t commandPosition = line.find_first_not_of(whitespace, 0);
- if (commandPosition == std::string::npos)
- {
- // Skip whitespace-only lines
- continue;
- }
-
- // Determine command type
- std::string command = line.substr(commandPosition, line.find_first_of(" \t=", commandPosition) - commandPosition);
-
- // Parse command
- if (command == "shader" || command == "flags")
- {
- // Find position of equals sign
- std::size_t equalsSignPosition = line.find_first_of("=", commandPosition);
- if (equalsSignPosition == std::string::npos)
- {
- // Line has no equals sign
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Invalid line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
-
- // Find position of first character in the value string
- std::size_t valueStartPosition = line.find_first_not_of(whitespace, equalsSignPosition + 1);
- if (valueStartPosition == std::string::npos)
- {
- // Line has no value
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Invalid line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
-
- // Find position the end of the value string
- std::size_t valueEndPosition = line.find_first_of(" \t;\r\n", valueStartPosition);
-
- // Determine value string
- std::string valueString;
- if (valueEndPosition == std::string::npos)
- {
- valueString = line.substr(valueStartPosition);
- }
- else
- {
- valueString = line.substr(valueStartPosition, valueEndPosition - valueStartPosition);
- }
-
- // Execute command
- if (command == "shader")
- {
- // Load shader
- Shader* shader = nullptr;
- try
- {
- shader = resourceManager->load<Shader>(valueString);
- }
- catch (const std::exception& e)
- {
- std::string error = std::string("ResourceLoader<Material>::load(): Failed to load shader \"") + valueString + std::string("\": \"") + e.what() + std::string("\"");
- throw std::runtime_error(error.c_str());
- }
-
- material->setShader(shader);
- }
- else
- {
- // Parse flags
- std::uint64_t flags;
- std::stringstream stream;
- stream << valueString;
- stream >> flags;
-
- material->setFlags(flags);
- }
- }
- else if (command == "var")
- {
- // Find position of first character in variable name
- std::size_t variableNamePosition = line.find_first_not_of(whitespace, commandPosition + command.length());
- if (variableNamePosition == std::string::npos)
- {
- // Skip lines with no variable name
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Invalid variable on line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
-
- // Find position of equals sign
- std::size_t equalsSignPosition = line.find_first_of("=", variableNamePosition);
- if (equalsSignPosition == std::string::npos)
- {
- // Skip lines with no equals sign
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Invalid variable on line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
-
- // Find position of first character in variable type
- std::size_t variableTypePosition = line.find_first_not_of(whitespace, equalsSignPosition + 1);
- if (variableTypePosition == std::string::npos)
- {
- // Skip lines with no variable type definition
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Invalid variable on line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
-
- // Count parentheses
- std::size_t leftParenthesisCount = std::count(line.begin() + variableNamePosition, line.end(), '(');
- std::size_t rightParenthesisCount = std::count(line.begin() + variableNamePosition, line.end(), ')');
- if (leftParenthesisCount != rightParenthesisCount || leftParenthesisCount == 0)
- {
- // Skip lines with invalid number of parentheses
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Invalid variable on line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
-
- std::string variableName = line.substr(variableNamePosition, line.find_first_of(" \t=", variableNamePosition) - variableNamePosition);
- std::string variableType = line.substr(variableTypePosition, line.find_first_of(" \t[(", variableTypePosition) - variableTypePosition);
- std::size_t elementCount = leftParenthesisCount;
-
- std::size_t currentPosition = variableTypePosition;
- std::vector<std::vector<std::string>> elements;
- bool invalid = false;
- for (std::size_t i = 0; i < elementCount; ++i)
- {
- std::size_t leftParenthesisPosition = line.find_first_of("(", currentPosition);
- std::size_t rightParenthesisPosition = line.find_first_of(")", leftParenthesisPosition + 1);
-
- if (leftParenthesisPosition == std::string::npos || rightParenthesisPosition == std::string::npos)
- {
- invalid = true;
- break;
- }
-
- currentPosition = leftParenthesisPosition + 1;
- std::size_t argumentCount = std::count(line.begin() + leftParenthesisPosition + 1, line.begin() + rightParenthesisPosition, ',') + 1;
- std::vector<std::string> arguments;
- for (std::size_t j = 0; j < argumentCount; ++j)
- {
- std::size_t argumentStart = line.find_first_not_of(whitespace, currentPosition);
- std::size_t argumentEnd = line.find_first_of(" \t,)", argumentStart + 1);
-
- if (argumentStart == std::string::npos || argumentEnd == std::string::npos)
- {
- // Unable to parse argument
- invalid = true;
- break;
- }
-
- std::string argument = line.substr(argumentStart, argumentEnd - argumentStart);
- arguments.push_back(argument);
-
- currentPosition = argumentEnd + 1;
- }
-
- if (invalid)
- {
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Unable to parse element on line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
-
- elements.push_back(arguments);
-
- currentPosition = rightParenthesisPosition + 1;
- }
-
- if (invalid)
- {
- // Unable to parse line
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Unable to parse line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
-
- if (variableType == "int")
- {
- ShaderInt* variable = material->addVariable<int>(variableName, elements.size());
- loadShaderInt(variable, elements);
- }
- else if (variableType == "float")
- {
- ShaderFloat* variable = material->addVariable<float>(variableName, elements.size());
- loadShaderFloat(variable, elements);
- }
- else if (variableType == "vec2")
- {
- ShaderVector2* variable = material->addVariable<Vector2>(variableName, elements.size());
- loadShaderVector2(variable, elements);
- }
- else if (variableType == "vec3")
- {
-
- ShaderVector3* variable = material->addVariable<Vector3>(variableName, elements.size());
- loadShaderVector3(variable, elements);
- }
- else if (variableType == "vec4")
- {
- ShaderVector4* variable = material->addVariable<Vector4>(variableName, elements.size());
- loadShaderVector4(variable, elements);
- }
- else if (variableType == "mat3")
- {
- ShaderMatrix3* variable = material->addVariable<Matrix3>(variableName, elements.size());
- loadShaderMatrix3(variable, elements);
- }
- else if (variableType == "mat4")
- {
- ShaderMatrix4* variable = material->addVariable<Matrix4>(variableName, elements.size());
- loadShaderMatrix4(variable, elements);
- }
- else if (variableType == "texture")
- {
- ShaderTexture2D* variable = material->addVariable<const Texture2D*>(variableName, elements.size());
- loadShaderTexture2D(resourceManager, variable, elements);
- }
- else if (variableType == "textureCube")
- {
- ShaderTextureCube* variable = material->addVariable<const TextureCube*>(variableName, elements.size());
- loadShaderTextureCube(resourceManager, variable, elements);
- }
- }
- else
- {
- if (command[0] == '#')
- {
- // Skip comments
- continue;
- }
-
- // Invalid command
- std::stringstream stream;
- stream << "ResourceLoader<Material>::load(): Invalid command \"" << command << "\" on line " << lineNumber << ".";
- throw std::runtime_error(stream.str().c_str());
- }
- }
-
- return material;
- }
-
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