Function that loads OpenGL shader program from .vert and .frag files

shader-loader.cpp

#include<iostream>
#include<fstream>
#include<algorithm>
#include<string>
#include<glad/glad.h>
#include<GLFW/glfw3.h>

// Example: GLuint program = loadShader("src/shaders/vertexShader.vert", "src/shaders/fragmentShader.frag");

GLuint loadShader(const char* vertex_path, const char* fragment_path) { // Returns OpenGL shaderProgram
	GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);
	GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);

	// Read shaders
	std::string vertShaderStr = readFile(vertex_path);
	std::string fragShaderStr = readFile(fragment_path);
	const char* vertShaderSrc = vertShaderStr.c_str();
	const char* fragShaderSrc = fragShaderStr.c_str();

	// Compile vertex shader
	glShaderSource(vertShader, 1, &vertShaderSrc, NULL);
	glCompileShader(vertShader);

	// Compile fragment shader
	glShaderSource(fragShader, 1, &fragShaderSrc, NULL);
	glCompileShader(fragShader);

	GLuint program = glCreateProgram();
	glAttachShader(program, vertShader);
	glAttachShader(program, fragShader);
	glLinkProgram(program);

	glDeleteShader(vertShader);
	glDeleteShader(fragShader);

	// Check is program was linked successfully
	char log[512];
	GLint success;
	glGetProgramiv(program, GL_LINK_STATUS, &success);
	if (success == GL_FALSE) {
		glGetProgramInfoLog(program, 512, NULL, log);
		std::cerr << "ERROR: Failed to link shader program " << &program << ". Check log for more information: \n" << log << "\n";
		return -1;
	}
	std::cout << "Program " << &program << " has been successfully linked.\n";
	return program;
}

std::string readFile(const char* filePath) {
	std::string content;
	std::ifstream fileStream(filePath, std::ios::in);

	if (!fileStream.is_open()) {
		std::cerr << "ERROR: Could not read file " << filePath << ". File does not exist.\n";
		return "";
	}

	std::string line = "";
	while (!fileStream.eof()) {
		std::getline(fileStream, line);
		content.append(line + "\n");
	}

	fileStream.close();
	return content;
}