From e657cd65bccc0c60f5666386409a5f4ae02df626 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sun, 20 Jun 2021 11:52:06 +0200
Subject: Improve camera, volumetric example sections

---
 tangle/util/camera.h | 152 +++++++++++++++++++++++++++------------------------
 1 file changed, 81 insertions(+), 71 deletions(-)

(limited to 'tangle/util/camera.h')

diff --git a/tangle/util/camera.h b/tangle/util/camera.h
index 4f31489..aa334d9 100644
--- a/tangle/util/camera.h
+++ b/tangle/util/camera.h
@@ -1,85 +1,95 @@
+#pragma once
 #include <cuda-samples/Common/helper_math.h>
 #include <glm/gtx/quaternion.hpp>
 #include "SFML/Window/Event.hpp"
 
+glm::vec3 apply(glm::quat q, glm::vec3 v) {
+  return glm::axis(q * glm::quat(0, v) * glm::conjugate(q));
+}
+
 class Camera {
 private:
-  glm::quat _rotation;
-  glm::vec3 _target;
-  glm::vec3 _position;
-  glm::vec3 _forward;
-  glm::vec3 _right;
-  glm::vec3 _up;
-  float _distance;
-  bool _dragging;
-  bool _moving;
-  float2 _lastMouse;
+glm::quat _rotation;
+
+glm::vec3 _target;
+glm::vec3 _position;
+glm::vec3 _forward;
+glm::vec3 _right;
+glm::vec3 _up;
+float _distance;
+
+float2 _lastMouse;
+bool _dragging;
+bool _moving;
+
+void update() {
+  _position = _target + apply(_rotation, glm::vec3(0, _distance, 0));
+  _forward = glm::normalize(_target - _position);
+  _right = apply(_rotation, glm::vec3(-1, 0, 0));
+  _up = apply(_rotation, glm::cross(glm::vec3(0, 1, 0), glm::vec3(-1, 0, 0)));
+}
 
 public:
-  Camera(float3 target, float distance):
-    _distance(distance),
-    _target(target.x, target.y, target.z),
-    _dragging(false),
-    _moving(false) {
-    update();
-  }
+Camera(float3 target, float distance):
+  _distance(distance),
+  _target(target.x, target.y, target.z),
+  _dragging(false),
+  _moving(false) {
+  update();
+}
 
-  void update() {
-    _position = _target + glm::axis(_rotation * glm::quat(0, 0, _distance, 0) * glm::conjugate(_rotation));
-    _forward = glm::normalize(_target - _position);
-    _right = glm::axis(_rotation * glm::quat(0, -1, 0, 0) * glm::conjugate(_rotation));
-    _up = glm::axis(_rotation * glm::quat(0, glm::cross(glm::vec3(0, 1, 0), glm::vec3(-1, 0, 0))) * glm::conjugate(_rotation));
-  }
+void handle(sf::Event& event) {
+  switch (event.type) {
+  case sf::Event::MouseButtonPressed:
+    if (event.mouseButton.button == sf::Mouse::Left) {
+      _dragging = true;
+      _lastMouse = make_float2(event.mouseButton.x, event.mouseButton.y);
+    } else if (event.mouseButton.button == sf::Mouse::Right) {
+      _moving = true;
+      _lastMouse = make_float2(event.mouseButton.x, event.mouseButton.y);
+    }
+    break;
+  case sf::Event::MouseButtonReleased:
+    if (event.mouseButton.button == sf::Mouse::Left) {
+      _dragging = false;
+    } else if (event.mouseButton.button == sf::Mouse::Right) {
+      _moving = false;
+    }
+    break;
 
-  void handle(sf::Event& event) {
-    switch (event.type) {
-    case sf::Event::MouseWheelMoved:
-      _distance -= event.mouseWheel.delta * 10;
-      break;
-    case sf::Event::MouseButtonPressed:
-      if (event.mouseButton.button == sf::Mouse::Left) {
-        _dragging = true;
-        _lastMouse = make_float2(event.mouseButton.x, event.mouseButton.y);
-      } else if (event.mouseButton.button == sf::Mouse::Right) {
-        _moving = true;
-        _lastMouse = make_float2(event.mouseButton.x, event.mouseButton.y);
-      }
-      break;
-    case sf::Event::MouseButtonReleased:
-      if (event.mouseButton.button == sf::Mouse::Left) {
-        _dragging = false;
-      } else if (event.mouseButton.button == sf::Mouse::Right) {
-        _moving = false;
-      }
-      break;
-    case sf::Event::MouseMoved:
-      float2 mouse = make_float2(event.mouseMove.x, event.mouseMove.y);
-      if (_dragging) {
-        float2 delta = 0.005 * (mouse - _lastMouse);
-        glm::quat rotation_z = glm::vec3(0,0,delta.x);
-        glm::quat rotation_x = glm::vec3(delta.y,0,0);
-        _rotation *= glm::cross(rotation_x, rotation_z);
-      }
-      if (_moving) {
-        float2 delta = 0.04 * (mouse - _lastMouse);
-        _target += _right*delta.x + _up*delta.y;
-      }
-      _lastMouse = mouse;
-      break;
+  case sf::Event::MouseWheelMoved:
+    _distance -= event.mouseWheel.delta * 10;
+    break;
+
+  case sf::Event::MouseMoved:
+    float2 mouse = make_float2(event.mouseMove.x, event.mouseMove.y);
+    if (_dragging) {
+      float2 delta = 0.005 * (mouse - _lastMouse);
+      glm::quat rotation_z = glm::vec3(0,0,delta.x);
+      glm::quat rotation_x = glm::vec3(delta.y,0,0);
+      _rotation *= glm::cross(rotation_x, rotation_z);
     }
-    update();
-  }
 
-  float3 getPosition() const {
-    return make_float3(_position.x, _position.y, _position.z);
-  }
-  float3 getForward() const {
-    return make_float3(_forward.x, _forward.y, _forward.z);
-  }
-  float3 getRight() const {
-    return make_float3(_right.x, _right.y, _right.z);
-  }
-  float3 getUp() const {
-    return make_float3(_up.x, _up.y, _up.z);
+    if (_moving) {
+      float2 delta = 0.04 * (mouse - _lastMouse);
+      _target += _right*delta.x + _up*delta.y;
+    }
+    _lastMouse = mouse;
+    break;
   }
+  update();
+}
+
+float3 getPosition() const {
+  return make_float3(_position.x, _position.y, _position.z);
+}
+float3 getForward() const {
+  return make_float3(_forward.x, _forward.y, _forward.z);
+}
+float3 getRight() const {
+  return make_float3(_right.x, _right.y, _right.z);
+}
+float3 getUp() const {
+  return make_float3(_up.x, _up.y, _up.z);
+}
 };
-- 
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