mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
synced 2026-01-02 04:37:54 +08:00
Update lighting maps exercise code.
This commit is contained in:
Joey de Vries
@@ -0,0 +1,350 @@
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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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 <learnopengl/filesystem.h>
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#include <learnopengl/shader_m.h>
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#include <learnopengl/camera.h>
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#include <iostream>
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void framebuffer_size_callback(GLFWwindow* window, int width, int height);
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void mouse_callback(GLFWwindow* window, double xpos, double ypos);
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
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void processInput(GLFWwindow *window);
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unsigned int loadTexture(const char *path);
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// settings
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const unsigned int SCR_WIDTH = 800;
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const unsigned int SCR_HEIGHT = 600;
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// camera
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Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
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float lastX = SCR_WIDTH / 2.0f;
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float lastY = SCR_HEIGHT / 2.0f;
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bool firstMouse = true;
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// timing
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float deltaTime = 0.0f;
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float lastFrame = 0.0f;
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// lighting
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glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
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int main()
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{
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// glfw: initialize and configure
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// ------------------------------
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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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#ifdef __APPLE__
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glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
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#endif
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// glfw window creation
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// --------------------
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GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
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if (window == NULL)
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{
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std::cout << "Failed to create GLFW window" << std::endl;
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glfwTerminate();
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return -1;
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}
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glfwMakeContextCurrent(window);
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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// tell GLFW to capture our mouse
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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// glad: load all OpenGL function pointers
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// ---------------------------------------
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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
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{
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std::cout << "Failed to initialize GLAD" << std::endl;
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return -1;
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}
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// configure global opengl state
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// -----------------------------
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glEnable(GL_DEPTH_TEST);
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// build and compile our shader zprogram
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// ------------------------------------
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Shader lightingShader("4.3.lighting_maps.vs", "4.3.lighting_maps.fs");
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Shader lampShader("4.3.lamp.vs", "4.3.lamp.fs");
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// set up vertex data (and buffer(s)) and configure vertex attributes
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// ------------------------------------------------------------------
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float vertices[] = {
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// positions // normals // texture coords
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
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0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
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-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
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0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f,
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f
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};
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// first, configure the cube's VAO (and VBO)
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unsigned int VBO, cubeVAO;
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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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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
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glEnableVertexAttribArray(2);
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// second, configure the light's VAO (VBO stays the same; the vertices are the same for the light object which is also a 3D cube)
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unsigned int lightVAO;
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glGenVertexArrays(1, &lightVAO);
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glBindVertexArray(lightVAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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// note that we update the lamp's position attribute's stride to reflect the updated buffer data
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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// load textures (we now use a utility function to keep the code more organized)
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// -----------------------------------------------------------------------------
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unsigned int diffuseMap = loadTexture(FileSystem::getPath("resources/textures/container2.png").c_str());
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unsigned int specularMap = loadTexture(FileSystem::getPath("resources/textures/container2_specular.png").c_str());
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unsigned int emissionMap = loadTexture(FileSystem::getPath("resources/textures/matrix.jpg").c_str());
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// shader configuration
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// --------------------
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lightingShader.use();
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lightingShader.setInt("material.diffuse", 0);
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lightingShader.setInt("material.specular", 1);
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lightingShader.setInt("material.emission", 2);
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// render loop
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// -----------
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while (!glfwWindowShouldClose(window))
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{
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// per-frame time logic
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// --------------------
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float currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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// input
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// -----
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processInput(window);
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// render
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// ------
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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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// be sure to activate shader when setting uniforms/drawing objects
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lightingShader.use();
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lightingShader.setVec3("light.position", lightPos);
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lightingShader.setVec3("viewPos", camera.Position);
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// light properties
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lightingShader.setVec3("light.ambient", 0.2f, 0.2f, 0.2f);
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lightingShader.setVec3("light.diffuse", 0.5f, 0.5f, 0.5f);
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lightingShader.setVec3("light.specular", 1.0f, 1.0f, 1.0f);
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// material properties
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lightingShader.setFloat("material.shininess", 64.0f);
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// view/projection transformations
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glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
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glm::mat4 view = camera.GetViewMatrix();
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lightingShader.setMat4("projection", projection);
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lightingShader.setMat4("view", view);
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// world transformation
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glm::mat4 model = glm::mat4(1.0f);
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lightingShader.setMat4("model", model);
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// bind diffuse map
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, diffuseMap);
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// bind specular map
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D, specularMap);
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// bind emission map
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glActiveTexture(GL_TEXTURE2);
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glBindTexture(GL_TEXTURE_2D, emissionMap);
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// render the cube
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glBindVertexArray(cubeVAO);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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// also draw the lamp object
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lampShader.use();
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lampShader.setMat4("projection", projection);
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lampShader.setMat4("view", view);
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model = glm::mat4(1.0f);
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model = glm::translate(model, lightPos);
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model = glm::scale(model, glm::vec3(0.2f)); // a smaller cube
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lampShader.setMat4("model", model);
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glBindVertexArray(lightVAO);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
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// -------------------------------------------------------------------------------
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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// optional: de-allocate all resources once they've outlived their purpose:
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// ------------------------------------------------------------------------
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glDeleteVertexArrays(1, &cubeVAO);
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glDeleteVertexArrays(1, &lightVAO);
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glDeleteBuffers(1, &VBO);
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// glfw: terminate, clearing all previously allocated GLFW resources.
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// ------------------------------------------------------------------
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glfwTerminate();
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return 0;
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}
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// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
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// ---------------------------------------------------------------------------------------------------------
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void processInput(GLFWwindow *window)
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{
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if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
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glfwSetWindowShouldClose(window, true);
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if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
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camera.ProcessKeyboard(FORWARD, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
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camera.ProcessKeyboard(BACKWARD, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
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camera.ProcessKeyboard(LEFT, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
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camera.ProcessKeyboard(RIGHT, deltaTime);
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}
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// glfw: whenever the window size changed (by OS or user resize) this callback function executes
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// ---------------------------------------------------------------------------------------------
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void framebuffer_size_callback(GLFWwindow* window, int width, int height)
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{
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// make sure the viewport matches the new window dimensions; note that width and
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// height will be significantly larger than specified on retina displays.
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glViewport(0, 0, width, height);
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}
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// glfw: whenever the mouse moves, this callback is called
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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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float xoffset = xpos - lastX;
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float yoffset = lastY - ypos; // reversed since y-coordinates go from bottom to top
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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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// glfw: whenever the mouse scroll wheel scrolls, this callback is called
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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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// utility function for loading a 2D texture from file
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// ---------------------------------------------------
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unsigned int loadTexture(char const * path)
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{
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unsigned int textureID;
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glGenTextures(1, &textureID);
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int width, height, nrComponents;
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unsigned char *data = stbi_load(path, &width, &height, &nrComponents, 0);
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if (data)
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{
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GLenum format;
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if (nrComponents == 1)
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format = GL_RED;
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else if (nrComponents == 3)
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format = GL_RGB;
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else if (nrComponents == 4)
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format = GL_RGBA;
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glBindTexture(GL_TEXTURE_2D, textureID);
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glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
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glGenerateMipmap(GL_TEXTURE_2D);
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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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stbi_image_free(data);
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}
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else
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{
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std::cout << "Texture failed to load at path: " << path << std::endl;
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stbi_image_free(data);
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}
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return textureID;
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}
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