OpenGL南邮计算机图形学实验报告四——用键盘控制物体

计算机图形学的新题目要求

OpenGL配置参考：
南邮老前辈wonz哥的OpenGL配置(Shader.h始终不用改)、SOIL2 环境配置、GLM 环境配置
头
light.vs/light.fs/Camera.h参考上一篇实验报告

学习网站：LearnOpenGL CN

思路：

1. 上一节课已经做了用键盘控制镜头camera，这节课用键盘控制物体就可以参考镜头的控制。
   镜头camera的位置由向量front和right加减来控制。
   而物体我选择使用直接改变物体坐标，即x，y的值。

2. 先初始化物体的坐标ObjectPos（0，0，0）。通过键盘来改变坐标。
   然后每次循环画图的时候就按照ObjectPos的坐标画物体即可，注意设置延迟deltaTime和速度velocity和灵敏度（我直接在函数里设置了）。
   为了不删减功能我使用WASD控制镜头camera，用UP\DOWN\LEFT\RIGHT来控制物体。

transform = glm::translate(transform, ObjectPos);
//*
*
*
*//
void ObjectMovement(GLfloat& xPos, GLfloat& yPos,GLfloat deltaTime)
{//物体移动GLfloat velocity =10.0f * deltaTime;//10.0f是灵敏度，也可以获取if ( keys[GLFW_KEY_UP]) {yPos += 1.0f * velocity;}if ( keys[GLFW_KEY_DOWN]) {yPos -= 1.0f * velocity;}if ( keys[GLFW_KEY_LEFT]) {xPos -= 1.0f * velocity;}if ( keys[GLFW_KEY_RIGHT]) {xPos += 1.0f * velocity;}
}

效果图如下：


话不多说上代码：

main.cpp

#include<iostream>//GLEW
#define GLEW_STATIC
#include<GL/glew.h>//GLFW
#include<GLFW/glfw3.h>
#include"shader.h"
#include"Camera.h"
#include"Light.h"#include "SOIL2/SOIL2.h"
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include<glm/gtx/rotate_vector.hpp>const GLint WIDTH = 800, HEIGTH = 600;void KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mode);
void MouseCallback(GLFWwindow* window, double xPos, double yPos);
void ScrollCallback(GLFWwindow* window, double xOffset, double yOffest);
void DoMovement();
void ObjectMovement(GLfloat &xPos,GLfloat &yPos,GLfloat deltaTime);bool keys[1024];
Camera camera(glm::vec3(0.0f, 0.0f, 2.0f));
GLfloat deltaTime = 0.0f;
GLfloat lastTime = 0.0f;GLfloat lastX = WIDTH / 2.0;
GLfloat lastY=HEIGTH/2.0;bool firstMouse = true;int main()
{glfwInit();glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGTH, "Learn OpenGL", nullptr, nullptr);if (nullptr == window){std::cout << "Failed to create GLFW window" << std::endl;glfwTerminate();return -1;}//next two lines are for mac retina displayint screenWidth, screenHeight;glfwGetFramebufferSize(window, &screenWidth, &screenHeight);glfwMakeContextCurrent(window);glfwSetKeyCallback(window, KeyCallback);glfwSetCursorPosCallback(window, MouseCallback);glfwSetScrollCallback(window, ScrollCallback);//未实现glewExperimental = GL_TRUE;if (GLEW_OK != glewInit()){std::cout << "Failed to initialise GLEW" << std::endl;return -1;}glViewport(0, 0, screenWidth, screenHeight);glEnable(GL_DEPTH_TEST);glDepthFunc(GL_LESS);glEnable(GL_BLEND);glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);Shader ourShader = Shader("res/shaders/core.vs", "res/shaders/core.fs");Shader lightShader= Shader("res/shaders/light.vs", "res/shaders/light.fs");Light lightModel = Light();glm::vec3 lightPos = glm::vec3(1.0f, 1.0f, 0.0f);glm::vec3 ObjectPos = glm::vec3(0.0f, 0.0f, 0.0f);GLfloat vertices[] ={// position                 //color                 //normal-0.5f,-0.5f,0.5f,           0.0f,1.0f,0.0f,     0.0f,0.0f,-0.1f,0.5f,-0.5f,0.5f,            0.0f,1.0f,0.0f,     0.0f,0.0f,-0.1f,0.5f,0.5f,0.5f,         0.0f,1.0f,0.0f,     0.0f,0.0f,-0.1f,0.5f,0.5f,0.5f,         0.0f,1.0f,0.0f,     0.0f,0.0f,-0.1f,-0.5f,0.5f,0.5f,            0.0f,1.0f,0.0f,     0.0f,0.0f,-0.1f,-0.5f,-0.5f,0.5f,           0.0f,1.0f,0.0f,     0.0f,0.0f,-0.1f,-0.5f,-0.5f,-0.5f,      1.0f,0.0f,0.0f,     0.0f,0.0f,0.1f,0.5f,-0.5f,-0.5f,            1.0f,0.0f,0.0f,     0.0f,0.0f,0.1f,0.5f,0.5f,-0.5f,         1.0f,0.0f,0.0f,     0.0f,0.0f,0.1f,0.5f,0.5f,-0.5f,         1.0f,0.0f,0.0f,     0.0f,0.0f,0.1f,-0.5f,0.5f,-0.5f,            1.0f,0.0f,0.0f,     0.0f,0.0f,0.1f,-0.5f,-0.5f,-0.5f,       1.0f,0.0f,0.0f,     0.0f,0.0f,0.1f,-0.5f,0.5f,0.5f,         0.0f,0.0f,1.0f,   1.0f,0.0f,0.0f,-0.5f,0.5f,-0.5f,          0.0f,0.0f,1.0f,   1.0f,0.0f,0.0f,-0.5f,-0.5f,-0.5f,     0.0f,0.0f,1.0f,   1.0f,0.0f,0.0f,-0.5f,-0.5f,-0.5f,     0.0f,0.0f,1.0f,   1.0f,0.0f,0.0f,-0.5f,-0.5f,0.5f,          0.0f,0.0f,1.0f,   1.0f,0.0f,0.0f,-0.5f,0.5f,0.5f,           0.0f,0.0f,1.0f,   1.0f,0.0f,0.0f,0.5f,0.5f,0.5f,            1.0f,1.0f,0.0f,     -1.0f,0.0f,0.0f,0.5f,0.5f,-0.5f,            1.0f,1.0f,0.0f,     -1.0f,0.0f,0.0f,0.5f,-0.5f,-0.5f,           1.0f,1.0f,0.0f,     -1.0f,0.0f,0.0f,0.5f,-0.5f,-0.5f,           1.0f,1.0f,0.0f,     -1.0f,0.0f,0.0f,0.5f,-0.5f,0.5f,            1.0f,1.0f,0.0f,     -1.0f,0.0f,0.0f,0.5f,0.5f,0.5f,         1.0f,1.0f,0.0f,      -1.0f,0.0f,0.0f,-0.5f,-0.5f,-0.5f,     1.0f,0.0f,1.0f,     0.0f,-1.0f,0.0f,0.5f,-0.5f,-0.5f,           1.0f,0.0f,1.0f,     0.0f,-1.0f,0.0f,0.5f,-0.5f,0.5f,            1.0f,0.0f,1.0f,     0.0f,-1.0f,0.0f,0.5f,-0.5f,0.5f,            1.0f,0.0f,1.0f,     0.0f,-1.0f,0.0f,-0.5f,-0.5f,0.5f,           1.0f,0.0f,1.0f,     0.0f,-1.0f,0.0f,-0.5f,-0.5f,-0.5f,      1.0f,0.0f,1.0f,     0.0f,-1.0f,0.0f,-0.5f,0.5f,-0.5f,           0.0f,1.0f,1.0f,     0.0f,1.0f,0.0f,0.5f,0.5f,-0.5f,         0.0f,1.0f,1.0f,     0.0f,1.0f,0.0f,0.5f,0.5f,0.5f,          0.0f,1.0f,1.0f,     0.0f,1.0f,0.0f,0.5f,0.5f,0.5f,          0.0f,1.0f,1.0f,     0.0f,1.0f,0.0f,-0.5f,0.5f,0.5f,         0.0f,1.0f,1.0f,     0.0f,1.0f,0.0f,-0.5f,0.5f,-0.5f,            0.0f,1.0f,1.0f,     0.0f,1.0f,0.0f,};                                                                // the data should transfer to the memory on Graphic CardGLuint VAO, VBO;glGenVertexArrays(1, &VAO);glGenBuffers(1, &VBO);glBindVertexArray(VAO);glBindBuffer(GL_ARRAY_BUFFER, VBO);glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(GLfloat), (GLvoid*)0);glEnableVertexAttribArray(0);glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));glEnableVertexAttribArray(1);glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));glEnableVertexAttribArray(2);glBindBuffer(GL_ARRAY_BUFFER, 0);glBindVertexArray(0);while (!glfwWindowShouldClose(window)){GLfloat currentTime = glfwGetTime();deltaTime = currentTime - lastTime;lastTime = currentTime;glfwPollEvents();DoMovement();ObjectMovement(ObjectPos.x,ObjectPos.y, deltaTime);glClearColor(0.2f, 0.3f, 0.3f, 1.0f);glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glm::mat4 transform = glm::mat4(1.0f);lightPos = glm::rotate(lightPos, glm::radians(0.1f), glm::vec3(0.0f, 0.0f, 1.0f));transform = glm::translate(transform, lightPos);transform = glm::scale(transform, glm::vec3(0.1f, 0.1f, 0.1f));glm::mat4 projection = glm::mat4(1.0f);projection = glm::perspective(glm::radians(camera.GetZoom()), float(screenWidth) / float(screenHeight), 0.1f, 100.0f);glm::mat4 view = camera.GetViewMatrix();lightShader.Use();GLuint transLoc = glGetUniformLocation(lightShader.Program, "transform");glUniformMatrix4fv(transLoc, 1, GL_FALSE, glm::value_ptr(transform));transLoc = glGetUniformLocation(lightShader.Program, "projection");glUniformMatrix4fv(transLoc, 1, GL_FALSE, glm::value_ptr(projection));transLoc = glGetUniformLocation(lightShader.Program, "view");glUniformMatrix4fv(transLoc, 1, GL_FALSE, glm::value_ptr(view));lightModel.Draw(lightShader);transform = glm::mat4(1.0f);transform = glm::translate(transform, ObjectPos);//每次在ObjectPos位置画物体来达到移动transform = glm::rotate(transform, glm::radians(90.0f) * static_cast<GLfloat>(glfwGetTime()), glm::vec3(1.0f, 1.0f, 1.0f));transform = glm::scale(transform, glm::vec3(0.5f, 0.5f, 0.5f));//transform = glm::translate(transform, glm::vec3(0.1f, 0.0f,-0.8f));ourShader.Use();transLoc = glGetUniformLocation(ourShader.Program, "transform");glUniformMatrix4fv(transLoc, 1, GL_FALSE, glm::value_ptr(transform));transLoc= glGetUniformLocation(ourShader.Program, "projection");glUniformMatrix4fv(transLoc, 1, GL_FALSE, glm::value_ptr(projection));transLoc = glGetUniformLocation(ourShader.Program, "view");glUniformMatrix4fv(transLoc, 1, GL_FALSE, glm::value_ptr(view));glUniform3f(glGetUniformLocation(ourShader.Program, "LightPos"), lightPos.x, lightPos.y, lightPos.z);glUniform3f(glGetUniformLocation(ourShader.Program, "ViewPos"),camera.GetPosition().x, camera.GetPosition().y, camera.GetPosition().z);glUniform1f(glGetUniformLocation(ourShader.Program, "material.diffuse"), 0.6f);glUniform1f(glGetUniformLocation(ourShader.Program, "material.specular"), 0.9f);glBindVertexArray(VAO);glDrawArrays(GL_TRIANGLES, 0, 36);glBindVertexArray(0);glfwSwapBuffers(window);}glDeleteVertexArrays(1, &VAO);glDeleteBuffers(1, &VBO);ourShader.~Shader();glfwTerminate();return 0;
}void KeyCallback(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;}
}void DoMovement()
{//镜头移动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);}
}void MouseCallback(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;//Process the camera directioncamera.ProcessMouseMovement(xOffset, yOffset);
}void ObjectMovement(GLfloat& xPos, GLfloat& yPos,GLfloat deltaTime)
{//物体移动GLfloat velocity =10.0f * deltaTime;if ( keys[GLFW_KEY_UP]) {yPos += 1.0f * velocity;}if ( keys[GLFW_KEY_DOWN]) {yPos -= 1.0f * velocity;}if ( keys[GLFW_KEY_LEFT]) {xPos -= 1.0f * velocity;}if ( keys[GLFW_KEY_RIGHT]) {xPos += 1.0f * velocity;}
}void ScrollCallback(GLFWwindow* window, double xOffset, double yOffest)
{}//滚轮操作暂时没写

滚轮操作可以参考wonz哥
需要在camera中添加一个函数即可

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