mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
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Start code re-work Advanced OpenGL chapter.
This commit is contained in:
Joey de Vries
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// Std. Includes
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#include <string>
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#include <algorithm>
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using namespace std;
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// GLEW
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#define GLEW_STATIC
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#include <GL/glew.h>
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// GLFW
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#include <GLFW/glfw3.h>
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// GL includes
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#include <learnopengl/shader.h>
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#include <learnopengl/camera.h>
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// GLM Mathemtics
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#include <glm/glm.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtc/type_ptr.hpp>
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// Other Libs
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#include <SOIL.h>
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#include <learnopengl/filesystem.h>
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// Properties
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GLuint screenWidth = 800, screenHeight = 600;
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// Function prototypes
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void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
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void mouse_callback(GLFWwindow* window, double xpos, double ypos);
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void Do_Movement();
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GLuint loadTexture(GLchar const * path);
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GLuint loadCubemap(std::vector<std::string> faces);
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// Camera
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Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
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bool keys[1024];
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GLfloat lastX = 400, lastY = 300;
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bool firstMouse = true;
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GLfloat deltaTime = 0.0f;
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GLfloat lastFrame = 0.0f;
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// The MAIN function, from here we start our application and run our Game loop
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int main()
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{
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// Init GLFW
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
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GLFWwindow* window = glfwCreateWindow(screenWidth, screenHeight, "LearnOpenGL", nullptr, nullptr); // Windowed
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glfwMakeContextCurrent(window);
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// Set the required callback functions
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glfwSetKeyCallback(window, key_callback);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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// Options
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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// Initialize GLEW to setup the OpenGL Function pointers
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glewExperimental = GL_TRUE;
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glewInit();
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// Define the viewport dimensions
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glViewport(0, 0, screenWidth, screenHeight);
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// Setup some OpenGL options
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_LESS);
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// Setup and compile our shaders
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Shader shader("cubemaps.vs", "cubemaps.frag");
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Shader skyboxShader("skybox.vs", "skybox.frag");
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#pragma region "object_initialization"
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// Set the object data (buffers, vertex attributes)
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GLfloat cubeVertices[] = {
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// Positions // Normals
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
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0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f
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};
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GLfloat skyboxVertices[] = {
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// Positions
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, -1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, 1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, -1.0f, 1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, 1.0f, -1.0f,
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1.0f, 1.0f, -1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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-1.0f, 1.0f, 1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, 1.0f
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};
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// Setup cube VAO
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GLuint cubeVAO, cubeVBO;
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glGenVertexArrays(1, &cubeVAO);
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glGenBuffers(1, &cubeVBO);
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glBindVertexArray(cubeVAO);
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glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(cubeVertices), &cubeVertices, GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
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glBindVertexArray(0);
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// Setup skybox VAO
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GLuint skyboxVAO, skyboxVBO;
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glGenVertexArrays(1, &skyboxVAO);
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glGenBuffers(1, &skyboxVBO);
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glBindVertexArray(skyboxVAO);
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glBindBuffer(GL_ARRAY_BUFFER, skyboxVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(skyboxVertices), &skyboxVertices, GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (GLvoid*)0);
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glBindVertexArray(0);
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#pragma endregion
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// Cubemap (Skybox)
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std::vector<std::string> faces;
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faces.push_back(FileSystem::getPath("resources/textures/skybox/right.jpg"));
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faces.push_back(FileSystem::getPath("resources/textures/skybox/left.jpg"));
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faces.push_back(FileSystem::getPath("resources/textures/skybox/top.jpg"));
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faces.push_back(FileSystem::getPath("resources/textures/skybox/bottom.jpg"));
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faces.push_back(FileSystem::getPath("resources/textures/skybox/back.jpg"));
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faces.push_back(FileSystem::getPath("resources/textures/skybox/front.jpg"));
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GLuint skyboxTexture = loadCubemap(faces);
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// Draw as wireframe
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//glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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// Game loop
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while (!glfwWindowShouldClose(window))
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{
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// Set frame time
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GLfloat currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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// Check and call events
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glfwPollEvents();
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Do_Movement();
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// Clear buffers
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// Draw scene as normal
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shader.Use();
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glm::mat4 model;
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glm::mat4 view = camera.GetViewMatrix();
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glm::mat4 projection = glm::perspective(camera.Zoom, (float)screenWidth / (float)screenHeight, 0.1f, 100.0f);
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
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glUniform3f(glGetUniformLocation(shader.Program, "cameraPos"), camera.Position.x, camera.Position.y, camera.Position.z);
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// Cubes
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glBindVertexArray(cubeVAO);
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glBindTexture(GL_TEXTURE_CUBE_MAP, skyboxTexture);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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glBindVertexArray(0);
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// Draw skybox as last
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glDepthFunc(GL_LEQUAL); // Change depth function so depth test passes when values are equal to depth buffer's content
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skyboxShader.Use();
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view = glm::mat4(glm::mat3(camera.GetViewMatrix())); // Remove any translation component of the view matrix
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glUniformMatrix4fv(glGetUniformLocation(skyboxShader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
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glUniformMatrix4fv(glGetUniformLocation(skyboxShader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
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// skybox cube
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glBindVertexArray(skyboxVAO);
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glBindTexture(GL_TEXTURE_CUBE_MAP, skyboxTexture);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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glBindVertexArray(0);
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glDepthFunc(GL_LESS); // Set depth function back to default
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// Swap the buffers
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glfwSwapBuffers(window);
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}
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glfwTerminate();
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return 0;
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}
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// Loads a cubemap texture from 6 individual texture faces
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// Order should be:
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// +X (right)
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// -X (left)
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// +Y (top)
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// -Y (bottom)
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// +Z (front)? (CHECK THIS)
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// -Z (back)?
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GLuint loadCubemap(std::vector<std::string> faces)
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{
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GLuint textureID;
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glGenTextures(1, &textureID);
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glActiveTexture(GL_TEXTURE0);
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int width, height;
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unsigned char* image;
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glBindTexture(GL_TEXTURE_CUBE_MAP, textureID);
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for (GLuint i = 0; i < faces.size(); i++)
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{
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image = SOIL_load_image(faces[i].c_str(), &width, &height, 0, SOIL_LOAD_RGB);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
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}
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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return textureID;
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}
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// This function loads a texture from file. Note: texture loading functions like these are usually
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// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
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// For learning purposes we'll just define it as a utility function.
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GLuint loadTexture(GLchar const * path)
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{
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//Generate texture ID and load texture data
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GLuint textureID;
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glGenTextures(1, &textureID);
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int width, height;
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unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
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// Assign texture to ID
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glBindTexture(GL_TEXTURE_2D, textureID);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
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glGenerateMipmap(GL_TEXTURE_2D);
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// Parameters
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glBindTexture(GL_TEXTURE_2D, 0);
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SOIL_free_image_data(image);
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return textureID;
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}
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#pragma region "User input"
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// Moves/alters the camera positions based on user input
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void Do_Movement()
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{
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// Camera controls
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if (keys[GLFW_KEY_W])
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camera.ProcessKeyboard(FORWARD, deltaTime);
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if (keys[GLFW_KEY_S])
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camera.ProcessKeyboard(BACKWARD, deltaTime);
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if (keys[GLFW_KEY_A])
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camera.ProcessKeyboard(LEFT, deltaTime);
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if (keys[GLFW_KEY_D])
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camera.ProcessKeyboard(RIGHT, deltaTime);
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}
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// Is called whenever a key is pressed/released via GLFW
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void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
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{
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if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
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glfwSetWindowShouldClose(window, GL_TRUE);
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if (action == GLFW_PRESS)
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keys[key] = true;
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else if (action == GLFW_RELEASE)
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keys[key] = false;
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}
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void mouse_callback(GLFWwindow* window, double xpos, double ypos)
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{
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if (firstMouse)
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{
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lastX = xpos;
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lastY = ypos;
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firstMouse = false;
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}
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GLfloat xoffset = xpos - lastX;
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GLfloat yoffset = lastY - ypos;
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lastX = xpos;
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lastY = ypos;
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camera.ProcessMouseMovement(xoffset, yoffset);
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}
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
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{
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camera.ProcessMouseScroll(yoffset);
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}
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#pragma endregion
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Block a user