mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
synced 2026-01-02 04:37:54 +08:00
a8a8d11f22
Uses environment variable to tell the program where to find resource files. Sharder sources are still search for in the current workind directory.
384 lines
15 KiB
C++
384 lines
15 KiB
C++
// 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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const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 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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void RenderScene(Shader &shader);
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void RenderCube();
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void RenderQuad();
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// Camera
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Camera camera(glm::vec3(0.0f, 0.0f, 5.0f));
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// Delta
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GLfloat deltaTime = 0.0f;
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GLfloat lastFrame = 0.0f;
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// Options
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GLboolean hdr = true; // Change with 'Space'
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GLfloat exposure = 1.0f; // Change with Q and E
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// Global variables
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GLuint woodTexture;
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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(SCR_WIDTH, SCR_HEIGHT, "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, SCR_WIDTH, SCR_HEIGHT);
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// Setup some OpenGL options
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glEnable(GL_DEPTH_TEST);
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// Setup and compile our shaders
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Shader shader("lighting.vs", "lighting.frag");
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Shader hdrShader("hdr.vs", "hdr.frag");
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// Light sources
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// - Positions
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std::vector<glm::vec3> lightPositions;
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lightPositions.push_back(glm::vec3(0.0f, 0.0f, 49.5f)); // back light
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lightPositions.push_back(glm::vec3(-1.4f, -1.9f, 9.0f));
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lightPositions.push_back(glm::vec3(0.0f, -1.8f, 4.0f));
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lightPositions.push_back(glm::vec3(0.8f, -1.7f, 6.0f));
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// - Colors
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std::vector<glm::vec3> lightColors;
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lightColors.push_back(glm::vec3(200.0f, 200.0f, 200.0f));
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lightColors.push_back(glm::vec3(0.1f, 0.0f, 0.0f));
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lightColors.push_back(glm::vec3(0.0f, 0.0f, 0.2f));
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lightColors.push_back(glm::vec3(0.0f, 0.1f, 0.0f));
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// Load textures
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woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
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// Set up floating point framebuffer to render scene to
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GLuint hdrFBO;
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glGenFramebuffers(1, &hdrFBO);
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// - Create floating point color buffer
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GLuint colorBuffer;
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glGenTextures(1, &colorBuffer);
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glBindTexture(GL_TEXTURE_2D, colorBuffer);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGB, GL_FLOAT, NULL);
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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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// - Create depth buffer (renderbuffer)
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GLuint rboDepth;
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glGenRenderbuffers(1, &rboDepth);
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glBindRenderbuffer(GL_RENDERBUFFER, rboDepth);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, SCR_WIDTH, SCR_HEIGHT);
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// - Attach buffers
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glBindFramebuffer(GL_FRAMEBUFFER, hdrFBO);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorBuffer, 0);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rboDepth);
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if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
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std::cout << "Framebuffer not complete!" << std::endl;
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
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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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// 1. Render scene into floating point framebuffer
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glBindFramebuffer(GL_FRAMEBUFFER, hdrFBO);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)SCR_WIDTH / (GLfloat)SCR_HEIGHT, 0.1f, 100.0f);
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glm::mat4 view = camera.GetViewMatrix();
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glm::mat4 model;
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shader.Use();
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, woodTexture);
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// - set lighting uniforms
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for (GLuint i = 0; i < lightPositions.size(); i++)
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{
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glUniform3fv(glGetUniformLocation(shader.Program, ("lights[" + std::to_string(i) + "].Position").c_str()), 1, &lightPositions[i][0]);
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glUniform3fv(glGetUniformLocation(shader.Program, ("lights[" + std::to_string(i) + "].Color").c_str()), 1, &lightColors[i][0]);
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}
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glUniform3fv(glGetUniformLocation(shader.Program, "viewPos"), 1, &camera.Position[0]);
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// - render tunnel
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model = glm::mat4();
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model = glm::translate(model, glm::vec3(0.0f, 0.0f, 25.0));
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model = glm::scale(model, glm::vec3(5.0f, 5.0f, 55.0f));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
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glUniform1i(glGetUniformLocation(shader.Program, "inverse_normals"), GL_TRUE);
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RenderCube();
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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// 2. Now render floating point color buffer to 2D quad and tonemap HDR colors to default framebuffer's (clamped) color range
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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hdrShader.Use();
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, colorBuffer);
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glUniform1i(glGetUniformLocation(hdrShader.Program, "hdr"), hdr);
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glUniform1f(glGetUniformLocation(hdrShader.Program, "exposure"), exposure);
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RenderQuad();
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std::cout << "exposure: " << exposure << std::endl;
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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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// RenderQuad() Renders a 1x1 quad in NDC, best used for framebuffer color targets
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// and post-processing effects.
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GLuint quadVAO = 0;
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GLuint quadVBO;
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void RenderQuad()
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{
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if (quadVAO == 0)
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{
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GLfloat quadVertices[] = {
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// Positions // Texture Coords
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-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
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-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
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1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
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1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
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};
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// Setup plane VAO
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glGenVertexArrays(1, &quadVAO);
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glGenBuffers(1, &quadVBO);
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glBindVertexArray(quadVAO);
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glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
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}
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glBindVertexArray(quadVAO);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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glBindVertexArray(0);
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}
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// RenderCube() Renders a 1x1 3D cube in NDC.
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GLuint cubeVAO = 0;
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GLuint cubeVBO = 0;
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void RenderCube()
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{
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// Initialize (if necessary)
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if (cubeVAO == 0)
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{
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GLfloat vertices[] = {
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// Back face
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // Bottom-left
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
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0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
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-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,// top-left
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// Front face
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
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0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
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-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
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// Left face
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
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-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
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-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
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// Right face
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
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0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
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// Bottom face
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
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0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,// bottom-left
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
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-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
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// Top face
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
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0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
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-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
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};
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glGenVertexArrays(1, &cubeVAO);
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glGenBuffers(1, &cubeVBO);
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// Fill buffer
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glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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// Link vertex attributes
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glBindVertexArray(cubeVAO);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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}
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// Render Cube
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glBindVertexArray(cubeVAO);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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glBindVertexArray(0);
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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_SRGB, 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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bool keys[1024];
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bool keysPressed[1024];
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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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if (keys[GLFW_KEY_SPACE] && !keysPressed[GLFW_KEY_SPACE])
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{
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hdr = !hdr;
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keysPressed[GLFW_KEY_SPACE] = true;
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}
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// Change parallax height scale
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if (keys[GLFW_KEY_Q])
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exposure -= 0.5 * deltaTime;
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else if (keys[GLFW_KEY_E])
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exposure += 0.5 * deltaTime;
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}
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GLfloat lastX = 400, lastY = 300;
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bool firstMouse = true;
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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 (key >= 0 && key <= 1024)
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{
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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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{
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keys[key] = false;
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keysPressed[key] = false;
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}
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}
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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;
|
|
firstMouse = false;
|
|
}
|
|
|
|
GLfloat xoffset = xpos - lastX;
|
|
GLfloat yoffset = lastY - ypos;
|
|
|
|
lastX = xpos;
|
|
lastY = ypos;
|
|
|
|
camera.ProcessMouseMovement(xoffset, yoffset);
|
|
}
|
|
|
|
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
|
|
{
|
|
camera.ProcessMouseScroll(yoffset);
|
|
} |