mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
synced 2026-01-02 04:37:54 +08:00
434 lines
17 KiB
C++
434 lines
17 KiB
C++
#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.h>
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#include <learnopengl/camera.h>
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#include <learnopengl/model.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, bool gammaCorrection);
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void renderQuad();
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void renderCube();
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// settings
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const unsigned int SCR_WIDTH = 1280;
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const unsigned int SCR_HEIGHT = 720;
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bool hdr = true;
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bool hdrKeyPressed = false;
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float exposure = 1.0f;
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// camera
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Camera camera(glm::vec3(0.0f, 0.0f, 5.0f));
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float lastX = (float)SCR_WIDTH / 2.0;
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float lastY = (float)SCR_HEIGHT / 2.0;
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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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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); // uncomment this statement to fix compilation on OS X
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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 shaders
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// -------------------------
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Shader shader("6.lighting.vs", "6.lighting.fs");
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Shader hdrShader("6.hdr.vs", "6.hdr.fs");
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// load textures
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// -------------
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unsigned int woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str(), true); // note that we're loading the texture as an SRGB texture
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// configure floating point framebuffer
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// ------------------------------------
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unsigned int hdrFBO;
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glGenFramebuffers(1, &hdrFBO);
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// create floating point color buffer
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unsigned int 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_RGBA16F, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGBA, 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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unsigned int 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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// lighting info
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// -------------
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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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// shader configuration
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// --------------------
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shader.use();
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shader.setInt("diffuseTexture", 0);
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hdrShader.use();
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hdrShader.setInt("hdrBuffer", 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(0.1f, 0.1f, 0.1f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// 1. render scene into floating point framebuffer
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// -----------------------------------------------
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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(glm::radians(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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shader.use();
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shader.setMat4("projection", projection);
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shader.setMat4("view", 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 (unsigned int i = 0; i < lightPositions.size(); i++)
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{
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shader.setVec3("lights[" + std::to_string(i) + "].Position", lightPositions[i]);
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shader.setVec3("lights[" + std::to_string(i) + "].Color", lightColors[i]);
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}
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shader.setVec3("viewPos", camera.Position);
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// render tunnel
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glm::mat4 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(2.5f, 2.5f, 27.5f));
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shader.setMat4("model", model);
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shader.setInt("inverse_normals", 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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// --------------------------------------------------------------------------------------------------------------------------
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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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hdrShader.setInt("hdr", hdr);
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hdrShader.setFloat("exposure", exposure);
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renderQuad();
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std::cout << "hdr: " << (hdr ? "on" : "off") << "| exposure: " << exposure << std::endl;
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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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glfwTerminate();
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return 0;
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}
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// renderCube() renders a 1x1 3D cube in NDC.
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// -------------------------------------------------
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unsigned int cubeVAO = 0;
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unsigned int 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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float vertices[] = {
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// back face
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-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
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1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
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1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
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1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
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-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
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-1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, // top-left
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// front face
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-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
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1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
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1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
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1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
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-1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
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-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
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// left face
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-1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
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-1.0f, 1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
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-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
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-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
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-1.0f, -1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
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-1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
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// right face
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1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
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1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
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1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
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1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
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1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
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1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
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// bottom face
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-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
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1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
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1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
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1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
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-1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
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-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
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// top face
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-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top-left
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1.0f, 1.0f , 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
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1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
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1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
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-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top-left
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-1.0f, 1.0f, 1.0f, 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(float), (void*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
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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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// renderQuad() renders a 1x1 XY quad in NDC
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// -----------------------------------------
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unsigned int quadVAO = 0;
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unsigned int 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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float 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(float), (void*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
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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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// 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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if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS && !hdrKeyPressed)
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{
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hdr = !hdr;
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hdrKeyPressed = true;
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}
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if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_RELEASE)
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{
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hdrKeyPressed = false;
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}
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if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
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{
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if (exposure > 0.0f)
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exposure -= 0.001f;
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else
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exposure = 0.0f;
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}
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else if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS)
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{
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exposure += 0.001f;
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}
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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
|
|
// ---------------------------------------------------
|
|
unsigned int loadTexture(char const * path, bool gammaCorrection)
|
|
{
|
|
unsigned int textureID;
|
|
glGenTextures(1, &textureID);
|
|
|
|
int width, height, nrComponents;
|
|
unsigned char *data = stbi_load(path, &width, &height, &nrComponents, 0);
|
|
if (data)
|
|
{
|
|
GLenum internalFormat;
|
|
GLenum dataFormat;
|
|
if (nrComponents == 1)
|
|
{
|
|
internalFormat = dataFormat = GL_RED;
|
|
}
|
|
else if (nrComponents == 3)
|
|
{
|
|
internalFormat = gammaCorrection ? GL_SRGB : GL_RGB;
|
|
dataFormat = GL_RGB;
|
|
}
|
|
else if (nrComponents == 4)
|
|
{
|
|
internalFormat = gammaCorrection ? GL_SRGB_ALPHA : GL_RGBA;
|
|
dataFormat = GL_RGBA;
|
|
}
|
|
|
|
glBindTexture(GL_TEXTURE_2D, textureID);
|
|
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, dataFormat, GL_UNSIGNED_BYTE, data);
|
|
glGenerateMipmap(GL_TEXTURE_2D);
|
|
|
|
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);
|
|
|
|
stbi_image_free(data);
|
|
}
|
|
else
|
|
{
|
|
std::cout << "Texture failed to load at path: " << path << std::endl;
|
|
stbi_image_free(data);
|
|
}
|
|
|
|
return textureID;
|
|
}
|