Commit of work up to day 11 of learnopengl.com.
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Zed A. Shaw
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319
09-basic-light-materials/src/main.cpp
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319
09-basic-light-materials/src/main.cpp
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#define _USE_MATH_DEFINES
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#include <math.h>
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#include "dbc.hpp"
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#include <print>
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#include <vector>
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#include <functional>
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#include "shader.hpp"
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#include <stb_image.h>
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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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#include "data.hpp"
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#include "physics.hpp"
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#include "model.hpp"
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#include "camera.hpp"
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void framebuffer_size_callback(GLFWwindow *window, int width, int height);
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void processInput(GLFWwindow *window);
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const unsigned int SCR_WIDTH = 800;
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const unsigned int SCR_HEIGHT = 600;
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struct Config {
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Shader shader;
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Shader light;
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Model model;
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glm::vec3 lightPos{1.2f, 1.0f, 2.0f};
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glm::vec3 boxPos{2.0f, 0.0f, 0.0f};
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unsigned int cubeVAO = 0;
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unsigned int lightCubeVAO = 0;
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unsigned int VBO = 0;
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Camera camera{};
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float deltaTime = 0.0f;
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float lastFrame = 0.0f;
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void updateDelta() {
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float currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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}
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};
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void 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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}
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void framebuffer_size_callback(GLFWwindow *, int width, int height) {
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glViewport(0, 0, width, height);
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}
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void mouse_callback(GLFWwindow *window, double xpos, double ypos) {
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Camera* camera = static_cast<Camera*>(glfwGetWindowUserPointer(window));
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camera->mouse_move(xpos, ypos);
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}
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void scroll_callback(GLFWwindow *window, double xoffset, double yoffset) {
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Camera* camera = static_cast<Camera*>(glfwGetWindowUserPointer(window));
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camera->mouse_scroll(xoffset, yoffset);
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}
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GLFWwindow* create_window() {
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GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
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dbc::check(window != NULL, "failed to open window");
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glfwMakeContextCurrent(window);
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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auto good = gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
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dbc::check(good, "failed to load GLAD");
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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return window;
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}
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void processInput(GLFWwindow *window, BoxTest &box, Camera& camera) {
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if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
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glfwSetWindowShouldClose(window, true);
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}
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if(glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS) {
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b2Vec2 force(0.0f, 0.5f);
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for(size_t i = 0; i < BODY_COUNT; i++) {
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box.bodies[i]->ApplyForceToCenter(force, true);
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box.bodies[i]->ApplyTorque(0.1f, true);
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}
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}
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if(glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
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camera.forward();
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}
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if(glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
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camera.back();
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}
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if(glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) {
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camera.left();
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}
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if(glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
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camera.right();
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}
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}
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unsigned int load_texture(const std::string& image_file) {
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unsigned int texture_id;
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glGenTextures(1, &texture_id);
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glBindTexture(GL_TEXTURE_2D, texture_id);
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// set the texture wrapping 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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// set texture filtering parameters
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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int width = 0;
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int height = 0;
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int nrChannels = 0;
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stbi_set_flip_vertically_on_load(true);
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unsigned char *data = stbi_load(image_file.c_str(), &width, &height, &nrChannels, 0);
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dbc::check(data != nullptr, std::format("Failed to load texture: {}", image_file));
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dbc::check(nrChannels == 3 || nrChannels == 4,
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std::format("Image {} has invalid channels {} should be 3 or 4.", image_file, nrChannels));
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auto rgb_or_a = nrChannels == 3 ? GL_RGB : GL_RGBA;
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glTexImage2D(GL_TEXTURE_2D, 0, rgb_or_a, width, height, 0, rgb_or_a, GL_UNSIGNED_BYTE, data);
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glGenerateMipmap(GL_TEXTURE_2D);
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stbi_image_free(data);
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return texture_id;
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}
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Config setup() {
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glEnable(GL_DEPTH_TEST);
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Config config{
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.shader={"shaders/08-vert.glsl", "shaders/08-frag.glsl"},
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.light={"shaders/08-vert.glsl", "shaders/08-lightsource.frag.glsl"},
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.model={"assets/popcorn_model_a.glb"}
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};
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unsigned int VBO = 0;
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unsigned int lightCubeVAO = 0;
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unsigned int cubeVAO = 0;
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// cube vao configure, this is the light target
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glGenVertexArrays(1, &cubeVAO);
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glGenBuffers(1, &VBO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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glBindVertexArray(cubeVAO);
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// position attribute
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)0);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)(3 * sizeof(float)));
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glEnableVertexAttribArray(1);
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// light vao configure, this is the light source
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glGenVertexArrays(1, &lightCubeVAO);
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glBindVertexArray(lightCubeVAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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config.lightCubeVAO = lightCubeVAO;
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config.cubeVAO = cubeVAO;
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config.VBO = VBO;
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return config;
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}
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void draw_popcorn(Config& config, BoxTest& box, size_t box_i, glm::mat4& projection, glm::mat4& view)
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{
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config.shader.use();
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config.shader.setVec3("objectColor", 1.0f, 0.5f, 0.31f);
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config.shader.setVec3("lightColor", 1.0f, 1.0f, 1.0f);
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// THIS WAS MISSING
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config.shader.setVec3("lightPos", config.lightPos);
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config.shader.setMat4("view", view);
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config.shader.setMat4("projection", projection);
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config.shader.setVec3("viewPos", config.camera.pos);
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float time = glfwGetTime();
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// get position from box
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b2Vec2 position = box.bodies[box_i]->GetPosition();
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float angle = box.bodies[box_i]->GetAngle();
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glm::mat4 model = glm::mat4(1.0f);
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model = glm::translate(model, glm::vec3(position.x, position.y, 0.0f));
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model = glm::rotate(model, angle / 5.0f, glm::vec3(1.0f, 0.0f, 0.0f));
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model = glm::rotate(model, glm::radians(time * 10.0f), glm::vec3(0.0f, 1.0f, 1.0f));
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config.shader.setMat4("model", model);
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config.model.Draw(config.shader);
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}
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void draw_cube(Config& config, glm::mat4& projection, glm::mat4& view) {
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config.shader.use();
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config.shader.setVec3("objectColor", 1.0f, 0.5f, 0.31f);
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config.shader.setVec3("lightColor", 1.0f, 1.0f, 1.0f);
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// THIS WAS MISSING
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config.shader.setVec3("lightPos", config.lightPos);
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config.shader.setMat4("view", view);
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config.shader.setMat4("projection", projection);
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config.shader.setVec3("viewPos", config.camera.pos);
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glm::mat4 model = glm::mat4(1.0f);
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model = glm::translate(model, config.boxPos);
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config.shader.setMat4("model", model);
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glBindVertexArray(config.cubeVAO);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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}
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void draw_light(Config& config, glm::mat4& projection, glm::mat4& view) {
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config.light.use();
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config.light.setVec3("lightPos", config.lightPos);
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config.light.setMat4("projection", projection);
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config.light.setMat4("view", view);
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glm::mat4 model = glm::mat4(1.0f);
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model = glm::translate(model, config.lightPos);
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model = glm::scale(model, glm::vec3(0.2f));
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config.light.setMat4("model", model);
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glBindVertexArray(config.lightCubeVAO);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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}
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void render(GLFWwindow* window, Config& config, BoxTest& box, b2World& world) {
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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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config.shader.use();
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Box2d_step_world(world);
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// time is used for fake 3d rotation
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float time = glfwGetTime();
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config.camera.update(config.deltaTime);
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glm::mat4 view = config.camera.lookAt();
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glm::mat4 projection = glm::mat4(1.0f);
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// fov, aspect, near plane, far plane
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projection = glm::perspective(glm::radians(config.camera.fov), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
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// update light color
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draw_cube(config, projection, view);
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// the 0 is for which popcorn, so later when we have N for-loop
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draw_popcorn(config, box, 0, projection, view);
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draw_light(config, projection, view);
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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void cleanup(Config& config) {
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glDeleteVertexArrays(1, &config.lightCubeVAO);
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glDeleteBuffers(1, &config.lightCubeVAO);
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glDeleteBuffers(1, &config.VBO);
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config.shader.cleanup();
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}
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int main() {
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init_glfw();
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b2Vec2 gravity(0.0f, -10.0f);
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b2World world(gravity);
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BoxTest box = Box2d_setup(world);
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auto window = create_window();
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auto config = setup();
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glfwSetWindowUserPointer(window, &config.camera);
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while(!glfwWindowShouldClose(window)) {
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processInput(window, box, config.camera);
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render(window, config, box, world);
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config.updateDelta();
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}
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cleanup(config);
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glfwTerminate();
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return 0;
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}
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