Super basic glfw setup - this uses GLFX to setup function pointers

.gitignore

._DS*
*DS_Store*
build
install
extern
node-*
references

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

set(app ocean)
set(sd ${CMAKE_CURRENT_LIST_DIR}/../src/)

include_directories(
  ${CMAKE_CURRENT_LIST_DIR}/../src
  ${CMAKE_CURRENT_LIST_DIR}/../extern/include
)

add_executable(${app} 
  ${sd}/main.cpp
)

if(APPLE)

  find_library(fr_corefoundation CoreFoundation)
  find_library(fr_cocoa Cocoa)
  find_library(fr_opengl OpenGL)
  find_library(fr_iokit IOKit)
  find_library(fr_corevideo CoreVideo)

  target_link_libraries(
    ${app}
    ${CMAKE_CURRENT_LIST_DIR}/../extern/lib/libglfw3.a
    ${fr_corefoundation}
    ${fr_cocoa}
    ${fr_opengl}
    ${fr_iokit}  
    ${fr_corevideo}
    -lz
    )
elseif(WIN32)
    get_filename_component(ed ${EXTERN_DIR} ABSOLUTE)
    target_link_libraries(
       ${app}
       ${ed}/lib/glfw3.lib
       Opengl32.lib                                   
       ws2_32.lib                  # opengl / glfw
       psapi.lib                   # opengl / glfw
       iphlpapi.lib                # opengl / glfw
endif()

main.cpp

/*

  GLFW TEMPLATE
  =============
  
  Latest version:

  ------------------------------------------------------------
  https://gist.github.com/roxlu/6698180
  ------------------------------------------------------------

  - 2020-05-06: Cleaned up a bit. 
  - 2019-07-24: Cleaned up, starting to keep history.

  NOTES: 

  - We make use of the GLAD library for GL loading, see: https://github.com/Dav1dde/glad/
  - Add the following to your cmakelists:

    list(APPEND poly_sources
       ${POLY_DIR}/src/poly/CommandLineParser.cpp
       ${POLY_DIR}/src/poly/CommandLineOptions.cpp
    )

 */
#include <stdlib.h>
#include <stdio.h>
#include <sstream>
#include <poly/Glad.h>
#include <GLFW/glfw3.h>
#include <poly/Log.h>
#include <poly/CommandLineOptions.h>

using namespace poly;

/* -------------------------------------------------------------------- */ 

void button_callback(GLFWwindow* win, int bt, int action, int mods);
void cursor_callback(GLFWwindow* win, double x, double y);
void key_callback(GLFWwindow* win, int key, int scancode, int action, int mods);
void char_callback(GLFWwindow* win, unsigned int key);
void error_callback(int err, const char* desc);
void resize_callback(GLFWwindow* window, int width, int height);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);

/* -------------------------------------------------------------------- */ 

int win_h = 0;
int win_w = 0;

/* -------------------------------------------------------------------- */ 
  
int main(int argc, char* argv[]) {

  glfwSetErrorCallback(error_callback);
  
  CommandLineOptions cmd;
  cmd.addU32("width", false, 1920, "Window width");
  cmd.addU32("height", false, 1080, "Window height");
  cmd.addU32("x", false, 0, "Window X position");
  cmd.addU32("y", false, 0, "Window Y position");
  cmd.addFlag("decorated", "Draw window title, min/max buttons and border.");

  if (0 != cmd.init(argc, argv)) {
    SX_ERROR("Failed to initialize.");
    exit(EXIT_FAILURE);
  }

  if(!glfwInit()) {
    printf("Error: cannot setup glfw.\n");
    exit(EXIT_FAILURE);
  }

  glfwWindowHint(GLFW_SAMPLES, 4);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
  glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
  glfwWindowHint(GLFW_COCOA_RETINA_FRAMEBUFFER, GL_FALSE);
  glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
  glfwWindowHint(GLFW_DECORATED, (true == cmd.hasFlag("decorated")) ? GL_TRUE : GL_FALSE);
 
  GLFWwindow* win = NULL;
  int w = cmd.getU32("width");
  int h = cmd.getU32("height");
  int x = cmd.getU32("x");
  int y = cmd.getU32("y");
  win_w = w;
  win_h = h;

  win = glfwCreateWindow(w, h, "application title", NULL, NULL);
  if(!win) {
    glfwTerminate();
    exit(EXIT_FAILURE);
  }

  glfwSetFramebufferSizeCallback(win, resize_callback);
  glfwSetKeyCallback(win, key_callback);
  glfwSetCharCallback(win, char_callback);
  glfwSetCursorPosCallback(win, cursor_callback);
  glfwSetMouseButtonCallback(win, button_callback);
  glfwSetScrollCallback(win, scroll_callback);
  glfwMakeContextCurrent(win);
  glfwSwapInterval(1);

  if (cmd.getU32("x") && cmd.getU32("y")) {
    glfwSetWindowPos(win, x, y);
  }
  
  if (!gladLoadGL()) {
    printf("Cannot load GL.\n");
    exit(1);
  }

  // ----------------------------------------------------------------
  // THIS IS WHERE YOU START CALLING OPENGL FUNCTIONS, NOT EARLIER!!
  // ----------------------------------------------------------------

  poly_log_init(1024, argc, argv);
  poly_log_add_sink_stdout();

  glDisable(GL_DEPTH_TEST);
  glDisable(GL_DITHER);
  glEnable(GL_BLEND);
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  /* -------------------------------------------------------------------- */

  /* Our main render loop. */
  while(!glfwWindowShouldClose(win)) {
    
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glViewport(0, 0, w, h);
    glClearColor(0.13f, 0.13f, 0.13f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    
    glfwSwapBuffers(win);
    glfwPollEvents();
  }

  glfwTerminate();

  return EXIT_SUCCESS;
}

/* -------------------------------------------------------------------- */ 

void key_callback(GLFWwindow* win, int key, int scancode, int action, int mods) {

  if (GLFW_RELEASE == action) {
    return;
  }
  
  switch(key) {
    case GLFW_KEY_ESCAPE: {
      glfwSetWindowShouldClose(win, GL_TRUE);
      break;
    }
  };
}


void button_callback(GLFWwindow* win, int bt, int action, int mods) {
  
  double mx = 0.0;
  double my = 0.0;
  glfwGetCursorPos(win, &mx, &my);
  
  if (GLFW_PRESS == action) {
  }
  else if (GLFW_RELEASE == action) {
  }
}

void error_callback(int err, const char* desc) {
  printf("GLFW error: %s (%d)\n", desc, err);
}

/* -------------------------------------------------------------------- */

void char_callback(GLFWwindow* win, unsigned int key) { }
void resize_callback(GLFWwindow* window, int width, int height) { }
void cursor_callback(GLFWwindow* win, double x, double y) { }
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset) { }

/* -------------------------------------------------------------------- */

run.sh

#!/bin/sh

if [ ! -d build ] ; then 
    mkdir build
fi

cd build
cmake ../
cmake --build .
./ocean