Question

How to get the max number of vertex attributes (vertex shader input (in) variable) can be declared in OpenGL with C++

Answer 1

#include <glad/glad.h>
#include <glfw3.h>

#include <iostream>

const unsigned int SCR_WIDTH = 800;
const unsigned int SCR_HEIGHT = 600;

// glfw: when window size changed this callback function executes // glfwSetFramebufferSizeCallback
void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
    // glfw: the viewport matches the new window dimensions
    glViewport(0, 0, width, height);
}

int main()
{
    // glfw: initialize
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    // glfw: create window
    GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "Window Title", NULL, NULL);
    if (window == NULL) {
        std::cout << "Failed to create GLFW window" << "\n";
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

    // glad: load all OpenGL function pointers
    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        std::cout << "Failed to initialize GLAD" << "\n";
        return -1;
    }

    int max_vattributes;
    glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &max_vattributes);
    std::cout << "Maximum vertex attributes supported: " << max_vattributes << std::endl;

    return 0;
}



/*
run:

Maximum vertex attributes supported: 16

*/

 

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