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feat(OpenGL-hello): camera

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This commit is contained in:
iridiumR 2023-05-25 16:55:12 +08:00
parent 342604514a
commit 1c5b887de1
4 changed files with 242 additions and 52 deletions
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4
OpenGL/hello/Makefile
View file

@ -11,7 +11,7 @@ LDFLAGS := $(shell pkg-config --static --libs glfw3)
#编译工具链
CC := g++
#输出文件命名
OUT := $(OUT_DIR)/lab1
OUT := $(OUT_DIR)/hello
#增加所有头文件所在的目录
# INC_DIR += ./include/glad
@ -55,6 +55,8 @@ nv:$(OUT)
run:$(OUT)
./$(OUT)
all:$(OUT)
.PHONY:clean
clean:
rm -rf ./${OUT_DIR}/*

148
OpenGL/hello/include/camera.h Normal file
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@ -0,0 +1,148 @@
#ifndef CAMERA_H
#define CAMERA_H
#include "glad/glad.h"
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <iostream>
#include <vector>
// Defines several possible options for camera movement. Used as abstraction to
// stay away from window-system specific input methods
enum Camera_Movement { FORWARD, BACKWARD, LEFT, RIGHT };
// Default camera values
const float YAW = -90.0f;
const float PITCH = 0.0f;
const float SPEED = 2.5f;
const float SENSITIVITY = 0.1f;
const float ZOOM = 45.0f;
// An abstract camera class that processes input and calculates the
// corresponding Euler Angles, Vectors and Matrices for use in OpenGL
class Camera {
public:
// camera Attributes
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Up;
glm::vec3 Right;
glm::vec3 WorldUp;
// euler Angles
float Yaw;
float Pitch;
// camera options
float MovementSpeed;
float MouseSensitivity;
float Zoom;
bool firstMouse;
float lastX, lastY;
// constructor with vectors
Camera(float X, float Y, glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f), float yaw = YAW,
float pitch = PITCH)
: Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(SPEED),
MouseSensitivity(SENSITIVITY), Zoom(ZOOM) {
lastX = X;
lastY = Y;
Position = position;
WorldUp = up;
Yaw = yaw;
Pitch = pitch;
updateCameraVectors();
}
// constructor with scalar values
Camera(float posX, float posY, float posZ, float upX, float upY, float upZ,
float yaw, float pitch)
: Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(SPEED),
MouseSensitivity(SENSITIVITY), Zoom(ZOOM) {
Position = glm::vec3(posX, posY, posZ);
WorldUp = glm::vec3(upX, upY, upZ);
Yaw = yaw;
Pitch = pitch;
updateCameraVectors();
}
// returns the view matrix calculated using Euler Angles and the LookAt Matrix
glm::mat4 GetViewMatrix() {
return glm::lookAt(Position, Position + Front, Up);
}
// processes input received from any keyboard-like input system. Accepts input
// parameter in the form of camera defined ENUM (to abstract it from windowing
// systems)
void ProcessKeyboard(Camera_Movement direction, float deltaTime) {
float velocity = MovementSpeed * deltaTime;
if (direction == FORWARD)
Position += Front * velocity;
if (direction == BACKWARD)
Position -= Front * velocity;
if (direction == LEFT)
Position -= Right * velocity;
if (direction == RIGHT)
Position += Right * velocity;
}
// processes input received from a mouse input system. Expects the offset
// value in both the x and y direction.
void ProcessMouseMovement(float xpos, float ypos,
GLboolean constrainPitch = true) {
if (firstMouse) {
lastX = xpos;
lastY = ypos;
firstMouse = false;
}
float xoffset = xpos - lastX;
float yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
xoffset *= MouseSensitivity;
yoffset *= MouseSensitivity;
Yaw += xoffset;
Pitch += yoffset;
// make sure that when pitch is out of bounds, screen doesn't get flipped
if (constrainPitch) {
if (Pitch > 89.0f)
Pitch = 89.0f;
if (Pitch < -89.0f)
Pitch = -89.0f;
}
// update Front, Right and Up Vectors using the updated Euler angles
updateCameraVectors();
}
// processes input received from a mouse scroll-wheel event. Only requires
// input on the vertical wheel-axis
void ProcessMouseScroll(float yoffset) {
Zoom -= (float)yoffset;
if (Zoom < 1.0f)
Zoom = 1.0f;
if (Zoom > 45.0f)
Zoom = 45.0f;
}
private:
// calculates the front vector from the Camera's (updated) Euler Angles
void updateCameraVectors() {
// calculate the new Front vector
glm::vec3 front;
front.x = cos(glm::radians(Yaw)) * cos(glm::radians(Pitch));
front.y = sin(glm::radians(Pitch));
front.z = sin(glm::radians(Yaw)) * cos(glm::radians(Pitch));
Front = glm::normalize(front);
// also re-calculate the Right and Up vector
Right = glm::normalize(glm::cross(
Front, WorldUp)); // normalize the vectors, because their length gets
// closer to 0 the more you look up or down which
// results in slower movement.
Up = glm::normalize(glm::cross(Right, Front));
}
};
#endif

52
OpenGL/hello/include/source.h Normal file
View file

@ -0,0 +1,52 @@
#include "camera.h"
#include "glad/glad.h"
#include "shader.h"
#include "stb_image.h"
#include <GLFW/glfw3.h>
#include <cmath>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <iostream>
float vertices[] = {
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, -0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, -0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f, -0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, -0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, -0.5f, 0.5f, -0.5f, 0.0f, 1.0f};
glm::vec3 cubePositions[] = {
glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(2.0f, 5.0f, -15.0f),
glm::vec3(-1.5f, -2.2f, -2.5f), glm::vec3(-3.8f, -2.0f, -12.3f),
glm::vec3(2.4f, -0.4f, -3.5f), glm::vec3(-1.7f, 3.0f, -7.5f),
glm::vec3(1.3f, -2.0f, -2.5f), glm::vec3(1.5f, 2.0f, -2.5f),
glm::vec3(1.5f, 0.2f, -1.5f), glm::vec3(-1.3f, 1.0f, -1.5f)};
float deltaTime = 0.0f; // 当前帧与上一帧的时间差
float lastFrame = 0.0f; // 上一帧的时间
// settings
const unsigned int SCR_WIDTH = 800;
const unsigned int SCR_HEIGHT = 800;
// 创建摄像机
Camera camera = Camera(SCR_HEIGHT / 2.0f, SCR_HEIGHT / 2.0f);

90
OpenGL/hello/src/main.cpp
View file

@ -1,51 +1,9 @@
#include "glad/glad.h"
#include "shader.h"
#include "stb_image.h"
#include <GLFW/glfw3.h>
#include <cmath>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <iostream>
float vertices[] = {
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, -0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, -0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f, -0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, -0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, -0.5f, 0.5f, -0.5f, 0.0f, 1.0f};
glm::vec3 cubePositions[] = {
glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(2.0f, 5.0f, -15.0f),
glm::vec3(-1.5f, -2.2f, -2.5f), glm::vec3(-3.8f, -2.0f, -12.3f),
glm::vec3(2.4f, -0.4f, -3.5f), glm::vec3(-1.7f, 3.0f, -7.5f),
glm::vec3(1.3f, -2.0f, -2.5f), glm::vec3(1.5f, 2.0f, -2.5f),
glm::vec3(1.5f, 0.2f, -1.5f), glm::vec3(-1.3f, 1.0f, -1.5f)};
#include "source.h"
void framebuffer_size_callback(GLFWwindow *window, int width, int height);
void processInput(GLFWwindow *window);
// settings
const unsigned int SCR_WIDTH = 600;
const unsigned int SCR_HEIGHT = 600;
void mouse_callback(GLFWwindow *window, double xpos, double ypos);
void scroll_callback(GLFWwindow *window, double xoffset, double yoffset);
int main() {
@ -73,7 +31,10 @@ int main() {
}
// 设置视口
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// 创建着色器程序
Shader shader = Shader("src/tex.vs", "src/tex.fs");
@ -158,19 +119,23 @@ int main() {
shader.setInt("texture2", 1);
// create transformations
glm::mat4 view = glm::mat4(1.0f);
glm::mat4 view =
glm::lookAt(glm::vec3(0.0f, 0.0f, 3.0f), glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3(0.0f, 1.0f, 0.0f));
glm::mat4 projection = glm::mat4(1.0f);
view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));
projection = glm::perspective(
glm::radians(45.0f), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
shader.setMat4("view", view);
shader.setMat4("projection", projection);
// 开启深度测试
glEnable(GL_DEPTH_TEST);
// 循环渲染
while (!glfwWindowShouldClose(window)) {
// 计算帧时间差
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// 处理输入
processInput(window);
@ -196,7 +161,7 @@ int main() {
for (unsigned int i = 0; i < 10; i++) {
glm::mat4 model(1.0f);
model = glm::translate(model, cubePositions[i]);
float angle = 20.0f * i;
float angle = 20.0f * i + 50.0f;
model =
glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
shader.setMat4("model", model);
@ -204,6 +169,13 @@ int main() {
glDrawArrays(GL_TRIANGLES, 0, 36);
}
float radius = 10.0f;
view = camera.GetViewMatrix();
shader.setMat4("view", view);
projection = glm::perspective(
glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
shader.setMat4("projection", projection);
// 检查并调用事件，交换缓冲
glfwSwapBuffers(window);
glfwPollEvents();
@ -218,9 +190,25 @@ int main() {
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);
}
// 窗口大小改变时回调该函数
void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
glViewport(0, 0, width, height);
}
void mouse_callback(GLFWwindow *window, double xpos, double ypos) {
camera.ProcessMouseMovement(xpos, ypos);
}
void scroll_callback(GLFWwindow *window, double xoffset, double yoffset) {
camera.ProcessMouseScroll(yoffset);
}