A minimal test app for OpenGL using GLFW, with nice defaults for debugging (ASAN, glDebugMessageCallback)

gl-test.cc

//usr/bin/make LDLIBS="-lGL -lglfw" CPPFLAGS="-Wall -Wextra -g -O1 -fno-omit-frame-pointer -fsanitize=address,undefined" -s "${0%.*}"&&exec "${0%.*}" "$@";exit
#define GLFW_INCLUDE_GLCOREARB
#define GL_GLEXT_PROTOTYPES
#include <GLFW/glfw3.h>
#include <stdio.h>

static GLFWwindow *window = NULL;
static int swapAndPollInput();

static void run() {
  glClearColor(0, 0, 1, 0);
  do {
    int display_w, display_h;
    glfwGetFramebufferSize(window, &display_w, &display_h);
    glViewport(0, 0, display_w, display_h);
    glClear(GL_COLOR_BUFFER_BIT);
  } while (swapAndPollInput());
}

static int swapAndPollInput() {
  glfwSwapBuffers(window);
  glfwPollEvents();
  return !glfwWindowShouldClose(window);
}

static void glfwErrorCallback(int, const char *message) {
  fprintf(stderr, "%s\n", message);
}

static void glMessageCallback(GLenum, GLenum, GLuint, GLenum, GLsizei,
                              const GLchar *message, const void *) {
  glfwErrorCallback(0, message);
}

int main() {
  // GLFW + OpenGL init
  glfwInit();
  glfwSetErrorCallback(glfwErrorCallback);
  glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);
  glfwWindowHint(GLFW_CONTEXT_ROBUSTNESS, GLFW_LOSE_CONTEXT_ON_RESET);
  window = glfwCreateWindow(1024, 768, "GL test app", NULL, NULL);
  glfwMakeContextCurrent(window);
  glDebugMessageCallback(glMessageCallback, NULL);
  glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, NULL, GL_FALSE);
  glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_HIGH, 0, NULL, GL_TRUE);
  glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_MEDIUM, 0, NULL, GL_TRUE);

  // Event loop
  run();
  // Cleanup
  glfwTerminate();
  return 0;
}