104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
#include "Camera.h"
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#include "OGL.h"
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#include <glm/gtx/rotate_vector.hpp>
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#include <glm/gtx/quaternion.hpp>
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Camera::Camera() {
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_viewDistance = 4.0f;
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_eye = glm::vec3(0.0f, 0.0f, _viewDistance);
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_at = glm::vec3(0.0f, 0.0f, 0.0f);
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_up = glm::vec3(0.0f, 1.0f, 0.0f);
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_view = glm::lookAt(_eye, _at, _up);
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_projection = glm::perspective(45.0f, 1.0f, 1.0f, 7.0f);
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}
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void Camera::init() {
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ShaderProgram* sp = OGL::instance()->getCurShaderProgram();
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GLint view = glGetUniformLocation(*sp, "mView");
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glUniformMatrix4fv(view, 1, GL_FALSE, glm::value_ptr(_view));
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GLint projection = glGetUniformLocation(*sp, "mProjection");
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glUniformMatrix4fv(projection, 1, GL_FALSE, glm::value_ptr(_projection));
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GLint eye = glGetUniformLocation(*sp, "vEye");
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glUniform3fv(eye, 1, glm::value_ptr(_eye));
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}
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Camera *Camera::instance() {
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static Camera camera;
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return &camera;
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}
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void Camera::updateView() {
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_view = glm::lookAt(_eye, _at, _up);
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ShaderProgram* sp = OGL::instance()->getCurShaderProgram();
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GLint view = glGetUniformLocation(*sp, "mView");
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glUniformMatrix4fv(view, 1, GL_FALSE, glm::value_ptr(_view));
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GLint eye = glGetUniformLocation(*sp, "vEye");
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glUniform3fv(eye, 1, glm::value_ptr(_eye));
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}
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void Camera::turnLeft(float angle) {
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glm::quat q = glm::angleAxis(angle, _up);
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_eye = glm::rotate(q, _eye);
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updateView();
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}
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void Camera::turnRight(float angle) {
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glm::quat q = glm::angleAxis(-angle, _up);
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_eye = glm::rotate(q, _eye);
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updateView();
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}
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void Camera::turnUp(float angle) {
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glm::vec3 axis = glm::normalize(glm::cross(_up, _eye));
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glm::quat q = glm::angleAxis(angle, axis);
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_eye = glm::rotate(q, _eye);
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_up = glm::normalize(glm::cross(_eye, axis));
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updateView();
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}
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void Camera::turnDown(float angle) {
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glm::vec3 axis = glm::normalize(glm::cross(_up, _eye));
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glm::quat q = glm::angleAxis(-angle, axis);
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_eye = glm::rotate(q, _eye);
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_up = glm::normalize(glm::cross(_eye, axis));
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updateView();
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}
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void Camera::rotateCW(float angle) {
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glm::quat q = glm::angleAxis(-angle, glm::normalize(_eye));
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_up = glm::rotate(q, _up);
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updateView();
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}
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void Camera::rotateCCW(float angle) {
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glm::quat q = glm::angleAxis(angle, glm::normalize(_eye));
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_up = glm::rotate(q, _up);
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updateView();
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}
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void Camera::moveToCenter(float distance) {
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_eye -= distance*glm::normalize(_eye);
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updateView();
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}
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void Camera::moveFromCenter(float distance) {
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_eye += distance*glm::normalize(_eye);
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updateView();
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}
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void Camera::moveForward(float distance) {
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}
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void Camera::moveBackward(float distance) {
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}
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void Camera::mouseMoveAroundCenter(float dx, float dy) {
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glm::quat q = glm::angleAxis(-dx, _up);
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glm::vec3 axis = glm::normalize(glm::cross(_up, _eye));
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glm::quat q2 = glm::angleAxis(-dy, axis);
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_eye = q*q2*_eye;
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_up = glm::normalize(glm::cross(_eye, axis));
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updateView();
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}
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