Поддерживаемые библиотеки для 2D графики

#include <iostream>
#include <string>
 
#include <glad/glad.h>
#include <GLFW/glfw3.h>
 
int fatalError(std::string errorString);
 
// Window dimensions
const GLuint WIDTH = 800, HEIGHT = 600;
 
// Shaders
const GLchar* vertexShaderSource = "#version 330 core\n"
"layout (location = 0) in vec3 position;\n"
"void main()\n"
"{\n"
"gl_Position = vec4(position.x, position.y, position.z, 1.0);\n"
"}\0";
const GLchar* fragmentShaderSource = "#version 330 core\n"
"out vec4 color;\n"
"void main()\n"
"{\n"
"color = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
"}\n\0";
 
// The MAIN function, from here we start the application and run the game loop
int main()
{
    // Set all the required options for GLFW
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
 
    //glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
 
    if (!glfwInit())
    {
        return fatalError("Faied to initialize GLFW");
    }
 
    // Create a GLFWwindow object that we can use for GLFW's functions
    GLFWwindow *window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
 
    if (nullptr == window)
    {
        return fatalError("Failed to create GLFW window");
    }
 
    int screenWidth, screenHeight;
    glfwGetFramebufferSize(window, &screenWidth, &screenHeight);
 
    glfwMakeContextCurrent(window);
 
    // Initialize GLAD to setup the OpenGL Function pointers
    if (!gladLoadGL())
    {
        return fatalError("Failed to initialize GLAD");
    }
 
    // Define the viewport dimensions
    glViewport(0, 0, screenWidth, screenHeight);
 
 
    // Build and compile our shader program
    // Vertex shader
    GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
    glCompileShader(vertexShader);
 
    // Check for compile time errors
    GLint success;
    GLchar infoLog[512];
 
    glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
    if (!success)
    {
        glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
        std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
    }
 
    // Fragment shader
    GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
    glCompileShader(fragmentShader);
 
    // Check for compile time errors
    glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
 
    if (!success)
    {
        glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
        std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
    }
 
    // Link shaders
    GLuint shaderProgram = glCreateProgram();
    glAttachShader(shaderProgram, vertexShader);
    glAttachShader(shaderProgram, fragmentShader);
    glLinkProgram(shaderProgram);
 
    // Check for linking errors
    glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
 
    if (!success)
    {
        glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
        std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
    }
 
    glDeleteShader(vertexShader);
    glDeleteShader(fragmentShader);
 
    // Set up vertex data (and buffer(s)) and attribute pointers
    GLfloat vertices[] =
    {
        -0.5f, -0.5f, 0.0f, // Bottom-Left
         0.5f, -0.5f, 0.0f, // Bottom-Right
        -0.5f,  0.5f, 0.0f, // Top-Left
         0.5f,  0.5f, 0.0f  // Top-Right
    };
 
    GLuint VBO, VAO;
    glGenVertexArrays(1, &VAO);
    glGenBuffers(1, &VBO);
    // Bind the Vertex Array Object first, then bind and set vertex buffer(s) and attribute pointer(s).
    glBindVertexArray(VAO);
 
    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
 
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (GLvoid *)0);
    glEnableVertexAttribArray(0);
 
    glBindBuffer(GL_ARRAY_BUFFER, 0); // Note that this is allowed, the call to glVertexAttribPointer registered VBO as the currently bound vertex buffer object so afterwards we can safely unbind
 
    glBindVertexArray(0); // Unbind VAO (it's always a good thing to unbind any buffer/array to prevent strange bugs)
 
    // Game loop
    while (!glfwWindowShouldClose(window))
    {
        // Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
        glfwPollEvents();
 
        // Render
        // Clear the colorbuffer
        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
 
        // Draw our first triangle
        glUseProgram(shaderProgram);
        glBindVertexArray(VAO);
        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
        glBindVertexArray(0);
 
        // Swap the screen buffers
        glfwSwapBuffers(window);
    }
 
    // Properly de-allocate all resources once they've outlived their purpose
    glDeleteVertexArrays(1, &VAO);
    glDeleteBuffers(1, &VBO);
 
    // Terminate GLFW, clearing any resources allocated by GLFW.
    glfwTerminate();
 
    return EXIT_SUCCESS;
}
 
int fatalError(std::string errorString)
{
    std::cout << errorString << std::endl;
    std::cout << "Press Enter key to quit..." << std::endl;
    std::getchar();
    glfwTerminate();
    return EXIT_FAILURE;
}