mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
synced 2026-01-02 04:37:54 +08:00
Template PBR lighting tut with folder re-structure to fit PBR tuts.
This commit is contained in:
Joey de Vries
473
src/6.pbr/1.1.lighting/lighting.cpp
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473
src/6.pbr/1.1.lighting/lighting.cpp
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// Std. Includes
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#include <string>
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// GLEW
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#define GLEW_STATIC
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#include <GL/glew.h>
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// GLFW
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#include <GLFW/glfw3.h>
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// GL includes
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#include <learnopengl/shader.h>
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#include <learnopengl/camera.h>
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#include <learnopengl/model.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 = 1280, SCR_HEIGHT = 720;
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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 RenderQuad();
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void renderSphere();
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// camera
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Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
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// timing
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GLfloat deltaTime = 0.0f;
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GLfloat lastFrame = 0.0f;
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// The MAIN function, from here we start our application and run our Game loop
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int main()
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{
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// Init GLFW
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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glfwWindowHint(GLFW_SAMPLES, 32);
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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("pbr.vs", "pbr.frag");
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// set (constant) material properties
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shader.Use();
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glUniform3f(glGetUniformLocation(shader.Program, "albedo"), 0.5f, 0.0f, 0.0f);
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glUniform1f(glGetUniformLocation(shader.Program, "ao"), 1.0f);
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// projection setup
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glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
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// lights
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glm::vec3 lightPositions[] = {
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glm::vec3(-10.0f, 10.0f, 10.0f),
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glm::vec3( 10.0f, 10.0f, 10.0f),
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glm::vec3(-10.0f, -10.0f, 10.0f),
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glm::vec3( 10.0f, -10.0f, 10.0f),
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};
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glm::vec3 lightColors[] = {
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glm::vec3(5.0f, 5.0f, 5.0f),
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glm::vec3(5.0f, 5.0f, 5.0f),
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glm::vec3(5.0f, 5.0f, 5.0f),
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glm::vec3(5.0f, 5.0f, 5.0f)
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};
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int nrRows = 7;
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int nrColumns = 7;
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float spacing = 2.5;
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// Game loop
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while (!glfwWindowShouldClose(window))
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{
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// set frame time
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GLfloat currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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// check and call events
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glfwPollEvents();
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Do_Movement();
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// clear the colorbuffer
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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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// configure view matrix
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shader.Use();
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glm::mat4 view = camera.GetViewMatrix();
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
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// setup relevant shader uniforms
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glUniform3fv(glGetUniformLocation(shader.Program, "camPos"), 1, &camera.Position[0]);
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glUniform1f(glGetUniformLocation(shader.Program, "exposure"), 1.0f);
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// render rows*column number of spheres with varying metallic/roughness values scaled by rows and columns respectively
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glm::mat4 model;
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for (int row = 0; row < nrRows; ++row)
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{
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glUniform1f(glGetUniformLocation(shader.Program, "metallic"), (float)row / (float)nrRows);
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for (int col = 0; col < nrColumns; ++col)
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{
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// we clamp the roughness to 0.025 - 1.0 as perfectly smooth surfaces (roughness of 0.0) tend to look a bit off
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// on direct lighting.
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glUniform1f(glGetUniformLocation(shader.Program, "roughness"), glm::clamp((float)col / (float)nrColumns, 0.05f, 1.0f));
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model = glm::mat4();
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model = glm::translate(model, glm::vec3(
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(float)(col - (nrColumns / 2)) * spacing,
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(float)(row - (nrRows / 2)) * spacing,
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0.0f
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));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
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renderSphere();
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}
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}
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// render light source (simply re-render sphere at light positions)
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// this looks a bit off as we use the same shader, but it'll make their positions obvious and
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// keeps the codeprint small.
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for (unsigned int i = 0; i < sizeof(lightPositions) / sizeof(lightPositions[0]); ++i)
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//for (unsigned int i = 0; i < 1; ++i)
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{
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glUniform3fv(glGetUniformLocation(shader.Program, ("lightPositions[" + std::to_string(i) + "]").c_str()), 1, &lightPositions[i][0]);
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glUniform3fv(glGetUniformLocation(shader.Program, ("lightColors[" + std::to_string(i) + "]").c_str()), 1, &lightColors[i][0]);
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model = glm::mat4();
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model = glm::translate(model, lightPositions[i]);
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model = glm::scale(model, glm::vec3(0.5f));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
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renderSphere();
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}
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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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unsigned int sphereVAO = 0;
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unsigned int indexCount;
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void renderSphere()
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{
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if (sphereVAO == 0)
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{
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glGenVertexArrays(1, &sphereVAO);
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unsigned int vbo, ebo;
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glGenBuffers(1, &vbo);
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glGenBuffers(1, &ebo);
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std::vector<glm::vec3> positions;
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std::vector<glm::vec2> uv;
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std::vector<glm::vec3> normals;
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std::vector<glm::vec3> tangents;
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std::vector<glm::vec3> bitangents;
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std::vector<unsigned int> indices;
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const unsigned int X_SEGMENTS = 64;
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const unsigned int Y_SEGMENTS = 64;
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const float PI = 3.14159265359;
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for (unsigned int y = 0; y <= Y_SEGMENTS; ++y)
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{
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for (unsigned int x = 0; x <= X_SEGMENTS; ++x)
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{
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float xSegment = (float)x / (float)X_SEGMENTS;
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float ySegment = (float)y / (float)Y_SEGMENTS;
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float xPos = std::cos(xSegment * 2.0f * PI) * std::sin(ySegment * PI); // NOTE(Joey): TAU is 2PI
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float yPos = std::cos(ySegment * PI);
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float zPos = std::sin(xSegment * 2.0f * PI) * std::sin(ySegment * PI);
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positions.push_back(glm::vec3(xPos, yPos, zPos));
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uv.push_back(glm::vec2(xSegment, ySegment));
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normals.push_back(glm::vec3(xPos, yPos, zPos));
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}
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}
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bool oddRow = false;
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for (int y = 0; y < Y_SEGMENTS; ++y)
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{
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if (!oddRow) // NOTE(Joey): even rows: y == 0, y == 2; and so on
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{
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for (int x = 0; x <= X_SEGMENTS; ++x)
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{
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indices.push_back(y * (X_SEGMENTS + 1) + x);
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indices.push_back((y + 1) * (X_SEGMENTS + 1) + x);
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}
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}
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else
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{
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for (int x = X_SEGMENTS; x >= 0; --x)
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{
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indices.push_back((y + 1) * (X_SEGMENTS + 1) + x);
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indices.push_back(y * (X_SEGMENTS + 1) + x);
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}
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}
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oddRow = !oddRow;
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}
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indexCount = indices.size();
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std::vector<float> data;
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for (int i = 0; i < positions.size(); ++i)
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{
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data.push_back(positions[i].x);
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data.push_back(positions[i].y);
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data.push_back(positions[i].z);
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if (uv.size() > 0)
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{
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data.push_back(uv[i].x);
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data.push_back(uv[i].y);
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}
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if (normals.size() > 0)
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{
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data.push_back(normals[i].x);
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data.push_back(normals[i].y);
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data.push_back(normals[i].z);
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}
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if (tangents.size() > 0)
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{
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data.push_back(tangents[i].x);
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data.push_back(tangents[i].y);
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data.push_back(tangents[i].z);
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}
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if (bitangents.size() > 0)
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{
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data.push_back(bitangents[i].x);
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data.push_back(bitangents[i].y);
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data.push_back(bitangents[i].z);
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}
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}
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glBindVertexArray(sphereVAO);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(float), &data[0], GL_STATIC_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), &indices[0], GL_STATIC_DRAW);
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//float stride = (3 + 2 + 3 + 3 + 3) * sizeof(float);
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float stride = (3 + 2 + 3) * sizeof(float);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, stride, (GLvoid*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (GLvoid*)(3 * sizeof(float)));
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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, stride, (GLvoid*)(5 * sizeof(float)));
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//glEnableVertexAttribArray(3);
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/* glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, stride, (GLvoid*)(8 * sizeof(float)));
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glEnableVertexAttribArray(4);
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glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, stride, (GLvoid*)(11 * sizeof(float)));*/
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}
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glBindVertexArray(sphereVAO);
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glDrawElements(GL_TRIANGLE_STRIP, indexCount, GL_UNSIGNED_INT, 0);
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}
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// RenderQuad() Renders a 1x1 quad in NDC
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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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// positions
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glm::vec3 pos1(-1.0, 1.0, 0.0);
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glm::vec3 pos2(-1.0, -1.0, 0.0);
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glm::vec3 pos3(1.0, -1.0, 0.0);
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glm::vec3 pos4(1.0, 1.0, 0.0);
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// texture coordinates
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glm::vec2 uv1(0.0, 1.0);
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glm::vec2 uv2(0.0, 0.0);
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glm::vec2 uv3(1.0, 0.0);
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glm::vec2 uv4(1.0, 1.0);
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// normal vector
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glm::vec3 nm(0.0, 0.0, 1.0);
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// calculate tangent/bitangent vectors of both triangles
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glm::vec3 tangent1, bitangent1;
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glm::vec3 tangent2, bitangent2;
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// - triangle 1
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glm::vec3 edge1 = pos2 - pos1;
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glm::vec3 edge2 = pos3 - pos1;
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glm::vec2 deltaUV1 = uv2 - uv1;
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glm::vec2 deltaUV2 = uv3 - uv1;
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GLfloat f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
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tangent1.x = f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x);
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tangent1.y = f * (deltaUV2.y * edge1.y - deltaUV1.y * edge2.y);
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tangent1.z = f * (deltaUV2.y * edge1.z - deltaUV1.y * edge2.z);
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tangent1 = glm::normalize(tangent1);
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bitangent1.x = f * (-deltaUV2.x * edge1.x + deltaUV1.x * edge2.x);
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bitangent1.y = f * (-deltaUV2.x * edge1.y + deltaUV1.x * edge2.y);
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bitangent1.z = f * (-deltaUV2.x * edge1.z + deltaUV1.x * edge2.z);
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bitangent1 = glm::normalize(bitangent1);
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// - triangle 2
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edge1 = pos3 - pos1;
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edge2 = pos4 - pos1;
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deltaUV1 = uv3 - uv1;
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deltaUV2 = uv4 - uv1;
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f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
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tangent2.x = f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x);
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tangent2.y = f * (deltaUV2.y * edge1.y - deltaUV1.y * edge2.y);
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tangent2.z = f * (deltaUV2.y * edge1.z - deltaUV1.y * edge2.z);
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tangent2 = glm::normalize(tangent2);
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bitangent2.x = f * (-deltaUV2.x * edge1.x + deltaUV1.x * edge2.x);
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bitangent2.y = f * (-deltaUV2.x * edge1.y + deltaUV1.x * edge2.y);
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bitangent2.z = f * (-deltaUV2.x * edge1.z + deltaUV1.x * edge2.z);
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bitangent2 = glm::normalize(bitangent2);
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GLfloat quadVertices[] = {
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// Positions // normal // TexCoords // Tangent // Bitangent
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pos1.x, pos1.y, pos1.z, nm.x, nm.y, nm.z, uv1.x, uv1.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
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pos2.x, pos2.y, pos2.z, nm.x, nm.y, nm.z, uv2.x, uv2.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
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pos3.x, pos3.y, pos3.z, nm.x, nm.y, nm.z, uv3.x, uv3.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
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pos1.x, pos1.y, pos1.z, nm.x, nm.y, nm.z, uv1.x, uv1.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z,
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pos3.x, pos3.y, pos3.z, nm.x, nm.y, nm.z, uv3.x, uv3.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z,
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pos4.x, pos4.y, pos4.z, nm.x, nm.y, nm.z, uv4.x, uv4.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z
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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, 14 * sizeof(GLfloat), (GLvoid*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
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glEnableVertexAttribArray(3);
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glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)(8 * sizeof(GLfloat)));
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glEnableVertexAttribArray(4);
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glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)(11 * sizeof(GLfloat)));
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}
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glBindVertexArray(quadVAO);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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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
|
||||
// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
|
||||
// For learning purposes we'll just define it as a utility function.
|
||||
GLuint loadTexture(GLchar const * path)
|
||||
{
|
||||
//Generate texture ID and load texture data
|
||||
GLuint textureID;
|
||||
glGenTextures(1, &textureID);
|
||||
int width, height;
|
||||
unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
|
||||
// Assign texture to ID
|
||||
glBindTexture(GL_TEXTURE_2D, textureID);
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
|
||||
glGenerateMipmap(GL_TEXTURE_2D);
|
||||
|
||||
// Parameters
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
glBindTexture(GL_TEXTURE_2D, 0);
|
||||
SOIL_free_image_data(image);
|
||||
return textureID;
|
||||
}
|
||||
|
||||
#pragma region "User input"
|
||||
|
||||
bool keys[1024];
|
||||
bool keysPressed[1024];
|
||||
// Moves/alters the camera positions based on user input
|
||||
void Do_Movement()
|
||||
{
|
||||
// Camera controls
|
||||
if (keys[GLFW_KEY_W])
|
||||
camera.ProcessKeyboard(FORWARD, deltaTime);
|
||||
if (keys[GLFW_KEY_S])
|
||||
camera.ProcessKeyboard(BACKWARD, deltaTime);
|
||||
if (keys[GLFW_KEY_A])
|
||||
camera.ProcessKeyboard(LEFT, deltaTime);
|
||||
if (keys[GLFW_KEY_D])
|
||||
camera.ProcessKeyboard(RIGHT, deltaTime);
|
||||
}
|
||||
|
||||
// Is called whenever a key is pressed/released via GLFW
|
||||
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
|
||||
{
|
||||
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
|
||||
glfwSetWindowShouldClose(window, GL_TRUE);
|
||||
|
||||
if (key >= 0 && key <= 1024)
|
||||
{
|
||||
if (action == GLFW_PRESS)
|
||||
keys[key] = true;
|
||||
else if (action == GLFW_RELEASE)
|
||||
{
|
||||
keys[key] = false;
|
||||
keysPressed[key] = false;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
GLfloat lastX = 400, lastY = 300;
|
||||
bool firstMouse = true;
|
||||
// Moves/alters the camera positions based on user input
|
||||
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
|
||||
{
|
||||
if (firstMouse)
|
||||
{
|
||||
lastX = xpos;
|
||||
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);
|
||||
}
|
||||
|
||||
#pragma endregion
|
||||
Reference in New Issue
Block a user