Add game framework and whitebox level

game/src/movement/platform_world.cpp

@@ -0,0 +1,39 @@
+#include "platform_world.h"
+
+#include <algorithm>
+
+namespace ns_game {
+
+MovementBody PlatformMover::Step(const MovementBody& body,
+                                 const PlatformWorld& world, float gravity,
+                                 float deltaTime) const {
+  MovementBody next = body;
+  const frostbite2D::Vec2 previousPosition = next.position;
+
+  next.velocity.y += gravity * deltaTime;
+  next.position += next.velocity * deltaTime;
+  next.grounded = false;
+
+  const float previousBottom = previousPosition.y + next.size.y;
+  const float newBottom = next.position.y + next.size.y;
+
+  for (const auto& platform : world.platforms) {
+    const bool horizontallyOverlaps =
+        next.position.x + next.size.x > platform.left() &&
+        next.position.x < platform.right();
+    const bool wasAbove = previousBottom <= platform.top() + 4.0f;
+    const bool crossedTop = newBottom >= platform.top();
+    if (next.velocity.y >= 0.0f && horizontallyOverlaps && wasAbove &&
+        crossedTop) {
+      next.position.y = platform.top() - next.size.y;
+      next.velocity.y = 0.0f;
+      next.grounded = true;
+    }
+  }
+
+  next.position.x =
+      std::clamp(next.position.x, world.levelLeft, world.levelRight - next.size.x);
+  return next;
+}
+
+} // namespace ns_game

game/src/movement/platform_world.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <frostbite2D/types/type_math.h>
+#include <vector>
+
+namespace ns_game {
+
+struct PlatformWorld {
+  float levelLeft = 0.0f;
+  float levelRight = 1280.0f;
+  std::vector<frostbite2D::Rect> platforms;
+};
+
+struct MovementBody {
+  frostbite2D::Vec2 position;
+  frostbite2D::Vec2 size;
+  frostbite2D::Vec2 velocity;
+  bool grounded = false;
+};
+
+class PlatformMover {
+public:
+  MovementBody Step(const MovementBody& body, const PlatformWorld& world,
+                    float gravity, float deltaTime) const;
+};
+
+} // namespace ns_game