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#include <stdio.h>
//GLEW
#define GLEW_STATIC
#include <GL\glew.h>
//GLFW
#include <glfw3.h>
 
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
 
// WINDOW DIMENSIONS
const GLuint WIDTH = 1280, HEIGHT = 720;
 
// SHADERS
const GLchar* vertexShaderSource = "#version 330 core\n"
"layout (location = 0) in vec3 position;\n"
"void main()\n"
"{\n"
"gl_Position = vec4(position.x, position.y, position.z 1.0);\n"
"}\0";
const GLchar* fragmentShaderSource = "#version 330 core\n"
"out vec4 color;\n"
"void main()\n"
"{\n"
"color = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
"}\0";
 
int main(void)
{
    // INIT CODE
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
 
    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearningOpenGL", nullptr, nullptr);
    if (window == nullptr) {
        printf("Failed to create GLFW window\n");
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
 
    glfwSetKeyCallback(window, key_callback);
 
    glewExperimental = GL_TRUE;
    if (glewInit() != GLEW_OK) {
        printf("Failed to init GLEW\n");
        return -1;
    }
 
    int width, height;
    glfwGetFramebufferSize(window, &width, &height);  
    glViewport(0, 0, width, height);
 
    // SETUP RENDER SETTINGS
    GLfloat vertices[] = {
        -0.5f, -0.5f, 0.0f,
         0.5f, -0.5f, 0.0f,
         0.0f,  0.5f, 0.0f
    };
 
    GLuint VBO;
    glGenBuffers(1, &VBO);
    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
 
    // SHADERS!!!!
 
    // VERTEX SHADER
    GLuint vertexShader;
    vertexShader = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
    glCompileShader(vertexShader);
    GLint success;
    GLchar infoLog[512];
    glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
    if (!success) {
        glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
        printf("ERROR SHADER VERTEX COMPILATION_FAILED\n%s", infoLog);
    }
 
    // FRAGMENT SHADER
    GLuint fragmentShader;
    fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
    glCompileShader(fragmentShader);
    glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
    if (!success) {
        glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
        printf("ERROR SHADER FRAGMENT COMPILATION_FAILED\n%s", infoLog);
    }
 
    // SHADER LINKING IN SHADER PROGRAM
    GLuint shaderProgram;
    shaderProgram = glCreateProgram();
    glAttachShader(shaderProgram, vertexShader);
    glAttachShader(shaderProgram, fragmentShader);
    glLinkProgram(shaderProgram);
    glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
    if (!success) {
        glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
        printf("ERROR SHADER PROGRAM LINKING_FAILED\n%s", infoLog);
    }
 
    glDeleteShader(vertexShader);
    glDeleteShader(fragmentShader);
 
    glUseProgram(shaderProgram);
 
 
    // MAIN GAME LOOP
    while (!glfwWindowShouldClose(window)) {
        glfwPollEvents();
 
        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
 
 
 
 
        glfwSwapBuffers(window);
    }
 
    glfwTerminate();
    return 0;
}
 
// KAY CALLBACK FUNCTIONS
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
        glfwSetWindowShouldClose(window, GL_TRUE);
    }
}