4.4面剔除

LearnOpenGL/src/Main/4高级OpenGL/4.3.2混合-窗户-正确.cpp

@@ -83,7 +83,6 @@ int main()
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
 
-
     // build and compile shaders
     // -------------------------
     Shader shader("assest/shader/4<>߼<EFBFBD>OpenGL/3.1.<2E><><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>.vs", "assest/shader/4<>߼<EFBFBD>OpenGL/3.1.<2E><><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>.fs");

LearnOpenGL/src/Main/4高级OpenGL/4.3.3.面剔除.cpp

@@ -0,0 +1,344 @@
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <stb_image.h>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+#include "Core/Shader/Shader.h"
+#include "Core/Camera/Camera.h"
+#include "Core/LoadModel/Model.h"
+
+#include <iostream>
+#include "MyFileSystem.h"
+
+void framebuffer_size_callback(GLFWwindow* window, int width, int height);
+void mouse_callback(GLFWwindow* window, double xpos, double ypos);
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
+void processInput(GLFWwindow* window);
+unsigned int loadTexture(const char* path);
+
+// settings
+const unsigned int SCR_WIDTH = 1280;
+const unsigned int SCR_HEIGHT = 720;
+
+// camera
+Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
+float lastX = (float)SCR_WIDTH / 2.0;
+float lastY = (float)SCR_HEIGHT / 2.0;
+bool firstMouse = true;
+
+// timing
+float deltaTime = 0.0f;
+float lastFrame = 0.0f;
+
+int main()
+{
+    // glfw: initialize and configure
+    // ------------------------------
+    glfwInit();
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+#ifdef __APPLE__
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#endif
+
+    // glfw window creation
+    // --------------------
+    GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
+    if (window == NULL)
+    {
+        std::cout << "Failed to create GLFW window" << std::endl;
+        glfwTerminate();
+        return -1;
+    }
+    glfwMakeContextCurrent(window);
+    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+    glfwSetCursorPosCallback(window, mouse_callback);
+    glfwSetScrollCallback(window, scroll_callback);
+
+    // tell GLFW to capture our mouse
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+    // glad: load all OpenGL function pointers
+    // ---------------------------------------
+    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
+    {
+        std::cout << "Failed to initialize GLAD" << std::endl;
+        return -1;
+    }
+
+    // configure global opengl state
+    // -----------------------------
+    glEnable(GL_DEPTH_TEST);
+    //glDepthFunc(GL_ALWAYS); // always pass the depth test (same effect as glDisable(GL_DEPTH_TEST))
+    glDepthFunc(GL_LESS);
+
+
+
+    // 1.<2E><>ȷ<EFBFBD>IJü<C4B2><C3BC><EFBFBD><EFBFBD><EFBFBD>
+    glEnable(GL_CULL_FACE);
+    glCullFace(GL_BACK);
+
+    // 2. <20>޳<EFBFBD>ǰ<EFBFBD><C7B0>
+    //glEnable(GL_CULL_FACE);
+    //glCullFace(GL_BACK);
+    //glFrontFace(GL_CW);// ˳ʱ<CBB3><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+    //glEnable(GL_CULL_FACE);
+    //glCullFace(GL_FRONT);
+
+    // build and compile shaders
+    // -------------------------
+    Shader shader("assest/shader/4<>߼<EFBFBD>OpenGL/1.1.depth_testing.vs", "assest/shader/4<>߼<EFBFBD>OpenGL/1.1.depth_testing.fs");
+
+    // set up vertex data (and buffer(s)) and configure vertex attributes
+    // ------------------------------------------------------------------
+    float cubeVertices[] = { // ȷ<><C8B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>붨<EFBFBD><EBB6A8><EFBFBD><EFBFBD>
+        // Back face<63><65><EFBFBD><EFBFBD><EFBFBD>棬<EFBFBD><E6A3AC><EFBFBD>ӽǿ<D3BD><C7BF>Ļ<EFBFBD><C4BB><EFBFBD>˳ʱ<CBB3><CAB1>˳<EFBFBD><CBB3><EFBFBD><EFBFBD>Ⱦ<EFBFBD>ģ<EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>붨<EFBFBD><EBB6A8><EFBFBD><EFBFBD>
+        -0.5f, -0.5f, -0.5f,  0.0f, 0.0f, // Bottom-left
+         0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-right
+         0.5f, -0.5f, -0.5f,  1.0f, 0.0f, // bottom-right         
+         0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-right
+        -0.5f, -0.5f, -0.5f,  0.0f, 0.0f, // bottom-left
+        -0.5f,  0.5f, -0.5f,  0.0f, 1.0f, // top-left
+        // Front face<63><65><EFBFBD><EFBFBD><EFBFBD>棬<EFBFBD><E6A3AC><EFBFBD>ӽǿ<D3BD><C7BF>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>Ⱦ<EFBFBD>ģ<EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD>Ҳ<EFBFBD><D2B2><EFBFBD><EFBFBD>ʱ<EFBFBD>붨<EFBFBD><EBB6A8><EFBFBD><EFBFBD>
+        -0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-left
+         0.5f, -0.5f,  0.5f,  1.0f, 0.0f, // bottom-right
+         0.5f,  0.5f,  0.5f,  1.0f, 1.0f, // top-right
+         0.5f,  0.5f,  0.5f,  1.0f, 1.0f, // top-right
+        -0.5f,  0.5f,  0.5f,  0.0f, 1.0f, // top-left
+        -0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-left
+        // Left face
+        -0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // top-right
+        -0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-left
+        -0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // bottom-left
+        -0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // bottom-left
+        -0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-right
+        -0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // top-right
+        // Right face
+         0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // top-left
+         0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // bottom-right
+         0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-right         
+         0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // bottom-right
+         0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // top-left
+         0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-left     
+        // Bottom face
+        -0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // top-right
+         0.5f, -0.5f, -0.5f,  1.0f, 1.0f, // top-left
+         0.5f, -0.5f,  0.5f,  1.0f, 0.0f, // bottom-left
+         0.5f, -0.5f,  0.5f,  1.0f, 0.0f, // bottom-left
+        -0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-right
+        -0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // top-right
+        // Top face
+        -0.5f,  0.5f, -0.5f,  0.0f, 1.0f, // top-left
+         0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // bottom-right
+         0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-right     
+         0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // bottom-right
+        -0.5f,  0.5f, -0.5f,  0.0f, 1.0f, // top-left
+        -0.5f,  0.5f,  0.5f,  0.0f, 0.0f  // bottom-left        
+    };
+    float planeVertices[] = {
+        // positions          // texture Coords (note we set these higher than 1 (together with GL_REPEAT as texture wrapping mode). this will cause the floor texture to repeat)
+        // <20><>ʱ<EFBFBD><CAB1>
+         5.0f, -0.5f,  5.0f,  2.0f, 0.0f,// <20><><EFBFBD><EFBFBD>
+         5.0f, -0.5f, -5.0f,  2.0f, 2.0f,// <20><><EFBFBD><EFBFBD>
+        -5.0f, -0.5f, -5.0f,  0.0f, 2.0f,// <20><><EFBFBD><EFBFBD>
+
+        -5.0f, -0.5f, -5.0f,  0.0f, 2.0f,// <20><><EFBFBD><EFBFBD>
+        -5.0f, -0.5f,  5.0f,  0.0f, 0.0f,// <20><><EFBFBD><EFBFBD>
+         5.0f, -0.5f,  5.0f,  2.0f, 0.0f,// <20><><EFBFBD><EFBFBD>
+    };
+    // cube VAO
+    unsigned int cubeVAO, cubeVBO;
+    glGenVertexArrays(1, &cubeVAO);
+    glGenBuffers(1, &cubeVBO);
+    glBindVertexArray(cubeVAO);
+    glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(cubeVertices), &cubeVertices, GL_STATIC_DRAW);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
+    glBindVertexArray(0);
+    // plane VAO
+    unsigned int planeVAO, planeVBO;
+    glGenVertexArrays(1, &planeVAO);
+    glGenBuffers(1, &planeVBO);
+    glBindVertexArray(planeVAO);
+    glBindBuffer(GL_ARRAY_BUFFER, planeVBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), &planeVertices, GL_STATIC_DRAW);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
+    glBindVertexArray(0);
+
+    // load textures
+    // -------------
+    unsigned int cubeTexture = loadTexture(FileSystem::getPath("assest/textures/container2.png").c_str());
+    unsigned int floorTexture = loadTexture(FileSystem::getPath("assest/textures/wall.jpg").c_str());
+
+    // shader configuration
+    // --------------------
+    shader.use();
+    shader.setInt("texture1", 0);
+
+    // render loop
+    // -----------
+    while (!glfwWindowShouldClose(window))
+    {
+        // per-frame time logic
+        // --------------------
+        float currentFrame = static_cast<float>(glfwGetTime());
+        deltaTime = currentFrame - lastFrame;
+        lastFrame = currentFrame;
+
+        // input
+        // -----
+        processInput(window);
+
+        // render
+        // ------
+        glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        shader.use();
+        glm::mat4 model = glm::mat4(1.0f);
+        glm::mat4 view = camera.GetViewMatrix();
+        glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
+        shader.setMat4("view", view);
+        shader.setMat4("projection", projection);
+        // cubes
+        glBindVertexArray(cubeVAO);
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, cubeTexture);
+        model = glm::translate(model, glm::vec3(-1.0f, 0.0f, -1.0f));
+        shader.setMat4("model", model);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        model = glm::mat4(1.0f);
+        model = glm::translate(model, glm::vec3(2.0f, 0.0f, 0.0f));
+        shader.setMat4("model", model);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        // floor
+        glBindVertexArray(planeVAO);
+        glBindTexture(GL_TEXTURE_2D, floorTexture);
+        model = glm::mat4(1.0f);
+        shader.setMat4("model", model);
+        glDrawArrays(GL_TRIANGLES, 0, 6);
+        glBindVertexArray(0);
+
+        // glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
+        // -------------------------------------------------------------------------------
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+    }
+
+    // optional: de-allocate all resources once they've outlived their purpose:
+    // ------------------------------------------------------------------------
+    glDeleteVertexArrays(1, &cubeVAO);
+    glDeleteVertexArrays(1, &planeVAO);
+    glDeleteBuffers(1, &cubeVBO);
+    glDeleteBuffers(1, &planeVBO);
+
+    glfwTerminate();
+    return 0;
+}
+
+// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
+// ---------------------------------------------------------------------------------------------------------
+void processInput(GLFWwindow* window)
+{
+    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+        glfwSetWindowShouldClose(window, true);
+
+    if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
+        camera.ProcessKeyboard(FORWARD, deltaTime);
+    if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
+        camera.ProcessKeyboard(BACKWARD, deltaTime);
+    if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
+        camera.ProcessKeyboard(LEFT, deltaTime);
+    if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
+        camera.ProcessKeyboard(RIGHT, deltaTime);
+}
+
+// glfw: whenever the window size changed (by OS or user resize) this callback function executes
+// ---------------------------------------------------------------------------------------------
+void framebuffer_size_callback(GLFWwindow* window, int width, int height)
+{
+    // make sure the viewport matches the new window dimensions; note that width and 
+    // height will be significantly larger than specified on retina displays.
+    glViewport(0, 0, width, height);
+}
+
+// glfw: whenever the mouse moves, this callback is called
+// -------------------------------------------------------
+void mouse_callback(GLFWwindow* window, double xposIn, double yposIn)
+{
+    float xpos = static_cast<float>(xposIn);
+    float ypos = static_cast<float>(yposIn);
+
+    if (firstMouse)
+    {
+        lastX = xpos;
+        lastY = ypos;
+        firstMouse = false;
+    }
+
+    float xoffset = xpos - lastX;
+    float yoffset = lastY - ypos; // reversed since y-coordinates go from bottom to top
+
+    lastX = xpos;
+    lastY = ypos;
+
+    camera.ProcessMouseMovement(xoffset, yoffset);
+}
+
+// glfw: whenever the mouse scroll wheel scrolls, this callback is called
+// ----------------------------------------------------------------------
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
+{
+    camera.ProcessMouseScroll(static_cast<float>(yoffset));
+}
+
+// utility function for loading a 2D texture from file
+// ---------------------------------------------------
+unsigned int loadTexture(char const* path)
+{
+    unsigned int textureID;
+    glGenTextures(1, &textureID);
+
+    int width, height, nrComponents;
+    unsigned char* data = stbi_load(path, &width, &height, &nrComponents, 0);
+    if (data)
+    {
+        GLenum format;
+        if (nrComponents == 1)
+            format = GL_RED;
+        else if (nrComponents == 3)
+            format = GL_RGB;
+        else if (nrComponents == 4)
+            format = GL_RGBA;
+
+        glBindTexture(GL_TEXTURE_2D, textureID);
+        glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, 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;
+}