137 lines
4.1 KiB
C++
137 lines
4.1 KiB
C++
// Shader.cpp
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#include "Shader.h"
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#include <fstream>
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#include <sstream>
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#include <iostream>
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#include <filesystem> // C++17 feature for file existence
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namespace fs = std::filesystem;
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Shader::Shader(const char* vertexPath, const char* fragmentPath)
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{
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// 1. Retrieve the vertex/fragment source code from filePath
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std::string vertexCode;
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std::string fragmentCode;
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std::ifstream vShaderFile;
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std::ifstream fShaderFile;
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// Check if shader files exist
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if (!fs::exists(vertexPath)) {
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std::cerr << "ERROR::SHADER::VERTEX_SHADER_FILE_NOT_FOUND: " << vertexPath << "\n";
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return;
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}
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if (!fs::exists(fragmentPath)) {
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std::cerr << "ERROR::SHADER::FRAGMENT_SHADER_FILE_NOT_FOUND: " << fragmentPath << "\n";
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return;
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}
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// Ensure ifstream objects can throw exceptions:
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vShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
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fShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
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try
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{
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// Open files
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vShaderFile.open(vertexPath);
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fShaderFile.open(fragmentPath);
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std::stringstream vShaderStream, fShaderStream;
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// Read file's buffer contents into streams
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vShaderStream << vShaderFile.rdbuf();
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fShaderStream << fShaderFile.rdbuf();
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// Close file handlers
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vShaderFile.close();
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fShaderFile.close();
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// Convert stream into string
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vertexCode = vShaderStream.str();
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fragmentCode = fShaderStream.str();
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}
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catch (std::ifstream::failure& e)
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{
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std::cerr << "ERROR::SHADER::FILE_NOT_SUCCESSFULLY_READ\n";
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std::cerr << "Failed to read shader files: " << vertexPath << " and " << fragmentPath << "\n";
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return;
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}
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const char* vShaderCode = vertexCode.c_str();
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const char * fShaderCode = fragmentCode.c_str();
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// 2. Compile shaders
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GLuint vertex, fragment;
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GLint success;
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GLchar infoLog[1024];
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// Vertex Shader
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vertex = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertex, 1, &vShaderCode, NULL);
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glCompileShader(vertex);
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// Print compile errors if any
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glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
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if(!success)
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{
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glGetShaderInfoLog(vertex, 1024, NULL, infoLog);
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std::cerr << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << "\n";
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}
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// Fragment Shader
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fragment = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragment, 1, &fShaderCode, NULL);
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glCompileShader(fragment);
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// Print compile errors if any
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glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
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if(!success)
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{
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glGetShaderInfoLog(fragment, 1024, NULL, infoLog);
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std::cerr << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << "\n";
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}
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// Shader Program
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ID = glCreateProgram();
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glAttachShader(ID, vertex);
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glAttachShader(ID, fragment);
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glLinkProgram(ID);
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// Print linking errors if any
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glGetProgramiv(ID, GL_LINK_STATUS, &success);
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if(!success)
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{
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glGetProgramInfoLog(ID, 1024, NULL, infoLog);
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std::cerr << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << "\n";
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}
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// Delete the shaders as they're linked into our program now and no longer necessary
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glDeleteShader(vertex);
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glDeleteShader(fragment);
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}
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void Shader::Use()
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{
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glUseProgram(ID);
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}
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void Shader::SetBool(const std::string &name, bool value) const
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{
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glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
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}
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void Shader::SetInt(const std::string &name, int value) const
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{
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glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
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}
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void Shader::SetFloat(const std::string &name, float value) const
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{
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glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
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}
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void Shader::SetVec3(const std::string &name, const glm::vec3 &value) const
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{
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glUniform3fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
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}
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void Shader::SetMat4(const std::string &name, const glm::mat4 &mat) const
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{
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glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
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}
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