GLFW - Opening a window -

Opening a window with GLEW and GLFW

CMake

Minimal CMakeLists.txt to build an OpenGL application.

CMake

cmake_minimum_required(VERSION 3.15)

set(CMAKE_CONFIGURATION_TYPES "Debug" "Release")
set(ProjectName "test00")
project(${ProjectName})

set(SOURCES "test00.cpp")

set(FILES ${SOURCES})

add_executable(${ProjectName} ${FILES})

set(CMAKE_CXX_FLAGS "-Wall -std=c++11 -std=gnu++11 -march=native")
set(CMAKE_CXX_FLAGS_DEBUG "-O0")
set(CMAKE_CXX_FLAGS_RELEASE "-O2")

target_link_libraries(${ProjectName} glfw GLEW GL)

Minimal

Open a blank window.

cpp

#include 

#include 
#include 
#include 

int main(int argc, char** argv)
{
    glewExperimental = true;
    if(!glfwInit()){
        fprintf(stderr, "Error: failed to initialize GLFW\n");
        return -1;
    }
    glfwWindowHint(GLFW_SAMPLES, 0);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    GLFWwindow* window = glfwCreateWindow(800, 600, "Test00", NULL, NULL);
    if(NULL == window){
        fprintf(stderr, "Error: failed to open GLFW window\n");
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    if(GLEW_OK != glewInit()){
        fprintf(stderr, "Error: failed to initialize GLEW\n");
        return -1;
    }
    glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);
    do{
        glClear(GL_COLOR_BUFFER_BIT);
        glfwSwapBuffers(window);
        glfwPollEvents();
    }while(glfwGetKey(window, GLFW_KEY_ESCAPE) != GLFW_PRESS && 0 == glfwWindowShouldClose(window));
    return 0;
}

Offscreen

Offscreen rendering only

cpp

glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
GLFWwindow* offscreen_context = glfwCreateWindow(640, 480, "", NULL, NULL);