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https://github.com/JoeyDeVries/LearnOpenGL.git
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Code re-format: lighting.
This commit is contained in:
Joey de Vries
290
src/2.lighting/3.1.materials/materials.cpp
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290
src/2.lighting/3.1.materials/materials.cpp
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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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// camera
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Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
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float lastX = 800.0f / 2.0;
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float lastY = 600.0 / 2.0;
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bool firstMouse = true;
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float deltaTime = 0.0f; // time between current frame and last frame
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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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//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // uncomment this statement to fix compilation on OS X
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// glfw window creation
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// --------------------
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GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
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glfwMakeContextCurrent(window);
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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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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("3.1.materials.vs", "3.1.materials.fs");
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Shader lampShader("1.lamp.vs", "1.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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-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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// 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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// 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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// normal attribute
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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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// 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, 6 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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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(0.2f, 0.3f, 0.3f, 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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glm::vec3 lightColor;
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lightColor.x = sin(glfwGetTime() * 2.0f);
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lightColor.y = sin(glfwGetTime() * 0.7f);
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lightColor.z = sin(glfwGetTime() * 1.3f);
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glm::vec3 diffuseColor = lightColor * glm::vec3(0.5f); // decrease the influence
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glm::vec3 ambientColor = diffuseColor * glm::vec3(0.2f); // low influence
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lightingShader.setVec3("light.ambient", ambientColor);
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lightingShader.setVec3("light.diffuse", diffuseColor);
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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.setVec3("material.ambient", 1.0f, 0.5f, 0.31f);
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lightingShader.setVec3("material.diffuse", 1.0f, 0.5f, 0.31f);
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lightingShader.setVec3("material.specular", 0.5f, 0.5f, 0.5f); // specular lighting doesn't have full effect on this object's material
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lightingShader.setFloat("material.shininess", 32.0f);
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// view/projection transformations
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glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), 800.0f / 600.0f, 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;
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lightingShader.setMat4("model", model);
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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();
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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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float cameraSpeed = 2.5 * deltaTime;
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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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