Removed physics for now.

archive/physics/2d/Box.cpp

@@ -0,0 +1,97 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#include "Box.hpp"
+
+using namespace Dawn;
+
+bool_t boxIsPointInside(glm::vec2 point, glm::vec2 min, glm::vec2 max) {
+  return (
+    point.x >= min.x && point.x <= max.x &&
+    point.y >= min.y && point.y <= max.y
+  );
+}
+
+bool_t Dawn::boxCheckCollision(
+  glm::vec2 posA, glm::vec2 minA, glm::vec2 maxA,
+  glm::vec2 posB, glm::vec2 minB, glm::vec2 maxB,
+  glm::vec2 velocity,
+  glm::vec2 &normal,
+  float_t &entryTime,
+  float_t &exitTime,
+  glm::vec2 &entryPoint,
+  glm::vec2 &exitPoint
+) {
+  // Calculate the time intervals of overlap in the x and y axes
+  glm::vec2 invEntry = glm::vec2(0.0f);
+  glm::vec2 invExit = glm::vec2(0.0f);
+
+  if (velocity.x >= 0.0f) {
+    invEntry.x = ((minB.x + posB.x) - (maxA.x + posA.x)) / velocity.x;
+    invExit.x = ((maxB.x + posB.x) - (minA.x + posA.x)) / velocity.x;
+  } else {
+    invEntry.x = ((maxB.x + posB.x) - (minA.x + posA.x)) / velocity.x;
+    invExit.x = ((minB.x + posB.x) - (maxA.x + posA.x)) / velocity.x;
+  }
+
+
+  if (velocity.y >= 0.0f) {
+    invEntry.y = ((minB.y + posB.y) - (maxA.y + posA.y)) / velocity.y;
+    invExit.y = ((maxB.y + posB.y) - (minA.y + posA.y)) / velocity.y;
+  } else {
+    invEntry.y = ((maxB.y + posB.y) - (minA.y + posA.y)) / velocity.y;
+    invExit.y = ((minB.y + posB.y) - (maxA.y + posA.y)) / velocity.y;
+  }
+
+  // Calculate the time of entry and exit for each axis
+  glm::vec2 entry = glm::max(invEntry, glm::vec2(0.0f));
+  glm::vec2 exit = glm::min(invExit, glm::vec2(1.0f));
+
+  // Find the time of entry and exit
+  entryTime = glm::max(entry.x, entry.y);
+  exitTime = glm::min(exit.x, exit.y);
+
+  // If there is no overlap in either axis, there is no collision
+  if (entryTime > exitTime || entry.x < 0.0f && entry.y < 0.0f || entry.x > 1.0f || entry.y > 1.0f) {
+    return false;
+  }
+
+  // Calculate the normal of the collision
+  if (entry.x > entry.y) {
+    if (invEntry.x < 0.0f) {
+      normal = glm::vec2(1.0f, 0.0f);
+    } else {
+      normal = glm::vec2(-1.0f, 0.0f);
+    }
+  } else {
+    if (invEntry.y < 0.0f) {
+      normal = glm::vec2(0.0f, 1.0f);
+    } else {
+      normal = glm::vec2(0.0f, -1.0f);
+    }
+  }
+
+  // Calculate the entry and exit points
+  entryPoint = posA + velocity * entryTime;
+  exitPoint = posA + velocity * exitTime;
+
+  return true;
+}
+
+bool_t Dawn::boxIsBoxColliding(
+  glm::vec2 posA, glm::vec2 minA, glm::vec2 maxA,
+  glm::vec2 posB, glm::vec2 minB, glm::vec2 maxB
+) {
+  // Check for no overlap in X axis
+  if (posA.x + maxA.x < posB.x + minB.x || posB.x + maxB.x < posA.x + minA.x) {
+    return false;
+  }
+
+  // Check for no overlap in Y axis
+  if (posA.y + maxA.y < posB.y + minB.y || posB.y + maxB.y < posA.y + minA.y) {
+    return false;
+  }
+  return true;
+}