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find_package(OpenGL)

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FetchContent_Declare(glad GIT_REPOSITORY https://github.com/Dav1dde/glad.git GIT_TAG df8e9e16110b305479a875399cee13daa0ccadd9)
FetchContent_MakeAvailable(glad)

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set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
set(GLFW_INSTALL OFF CACHE BOOL "" FORCE)
FetchContent_Declare(glfw GIT_REPOSITORY https://github.com/glfw/glfw.git GIT_TAG 3.3.2)
FetchContent_MakeAvailable(glfw)

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add_executable(opengl_hello opengl_hello.cpp)
target_link_libraries(opengl_hello PUBLIC glad glfw)

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

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void framebuffer_size_callback(GLFWwindow *window, int width, int height);
void processInput(GLFWwindow *window);

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    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

#ifdef __APPLE__
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif

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

GLFWwindow *window =
    glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
if (window == NULL) {
    std::cout << "Failed to create GLFW window" << std::endl;
    glfwTerminate();
    return -1;
}
glfwMakeContextCurrent(window);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
    std::cout << "Failed to initialize GLAD" << std::endl;
    return -1;
}

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while (!glfwWindowShouldClose(window)) {

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processInput(window);

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glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);

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    glfwSwapBuffers(window);
    glfwPollEvents();
}

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glfwTerminate();

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void processInput(GLFWwindow *window) {
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);
}

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void framebuffer_size_callback([[maybe_unused]] GLFWwindow *window, int width, int height) {
    // make sure the viewport matches the new window dimensions; note that width
    // and height will be significantly larger than specified on retina
    // displays.
    glViewport(0, 0, width, height);
}

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