#include <stdlib.h>
#include <stdio.h>
#include <GL/gl.h>
#include <GLFW/glfw3.h>

#define SCRW 512
#define SCRH 288
#define TITLE "Max texture size"

int main(void)
{
  if (!glfwInit())
  {
    fprintf(stderr, "Failed to initialize GLFW\n");
    exit(EXIT_FAILURE);
  }

  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 1); // set OpenGL 1.1
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);

  GLFWwindow *window = glfwCreateWindow(SCRW, SCRH, TITLE, NULL, NULL);
  if (!window)
  {
    fprintf(stderr, "Failed to open GLFW window\n");
    glfwTerminate();
    exit(EXIT_FAILURE);
  }

  glfwMakeContextCurrent(window);

  // get max texture size
  GLint maxTextureSize;
  glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);
  printf("Max Texture Size (width/height): %d\n", maxTextureSize);

  // save max texture size to log.txt
  FILE *fp;
  fp = fopen("log.txt", "w");
  if (fp != NULL)
  {
    fprintf(fp, "Max Texture Size (width/height): %d\n", maxTextureSize);
    fclose(fp);
  }

  // main loop
  while (!glfwWindowShouldClose(window))
  {
    // render
    glClearColor(0.2, 0.4, 0.8, 0.0);
    glClear(GL_COLOR_BUFFER_BIT);
    glfwSwapBuffers(window);
    glfwPollEvents();
  }

  glfwDestroyWindow(window);
  glfwTerminate();
  exit(EXIT_SUCCESS);
}