everything everywhere

all at once

1 files changed, 115 insertions, 0 deletions

diff --git a/source/game/StarCollisionBlock.hpp b/source/game/StarCollisionBlock.hpp
new file mode 100644
index 0000000..40234c9
--- /dev/null
+++ b/source/game/StarCollisionBlock.hpp
@@ -0,0 +1,115 @@
+#ifndef STAR_COLLISION_BLOCK_HPP
+#define STAR_COLLISION_BLOCK_HPP
+
+#include "StarPoly.hpp"
+#include "StarList.hpp"
+#include "StarBiMap.hpp"
+
+namespace Star {
+
+enum class CollisionKind : uint8_t {
+  // Special collision block that is used for unloaded / un-generated tiles.
+  // Collides the same as "Block", but does not tile with it.
+  Null,
+  None,
+  Platform,
+  Dynamic,
+  Slippery,
+  Block
+};
+
+class CollisionSet {
+public:
+  CollisionSet();
+  CollisionSet(initializer_list<CollisionKind> kinds);
+
+  void insert(CollisionKind kind);
+  void remove(CollisionKind kind);
+  bool contains(CollisionKind kind) const;
+
+private:
+  static uint8_t kindBit(CollisionKind kind);
+
+  uint8_t m_kinds;
+};
+
+// The default CollisionSet consists of Null, Slippery, Dynamic and Block
+CollisionSet const DefaultCollisionSet({CollisionKind::Null, CollisionKind::Slippery, CollisionKind::Dynamic, CollisionKind::Block});
+
+// Defines what can be "blocks" e.g. for tile rendering: Block and Slippery
+CollisionSet const BlockCollisionSet({CollisionKind::Block, CollisionKind::Slippery});
+
+extern EnumMap<CollisionKind> const CollisionKindNames;
+
+bool isColliding(CollisionKind kind, CollisionSet const& collisionSet);
+bool isSolidColliding(CollisionKind kind);
+
+// Returns the highest priority collision kind, where Block > Slippery >
+// Dynamic > Platform > None > Null
+CollisionKind maxCollision(CollisionKind first, CollisionKind second);
+
+struct CollisionBlock {
+  // Make a null collision block for the given space.
+  static CollisionBlock nullBlock(Vec2I const& space);
+
+  CollisionKind kind;
+  Vec2I space;
+  PolyF poly;
+  RectF polyBounds;
+};
+
+inline CollisionSet::CollisionSet()
+  : m_kinds(0) {}
+
+inline CollisionSet::CollisionSet(initializer_list<CollisionKind> kinds)
+  : CollisionSet() {
+  for (auto kind : kinds) {
+    insert(kind);
+  }
+}
+
+inline void CollisionSet::insert(CollisionKind kind) {
+  m_kinds = m_kinds | kindBit(kind);
+}
+
+inline void CollisionSet::remove(CollisionKind kind) {
+  m_kinds = m_kinds & ~kindBit(kind);
+}
+
+inline bool CollisionSet::contains(CollisionKind kind) const {
+  return m_kinds & kindBit(kind);
+}
+
+inline uint8_t CollisionSet::kindBit(CollisionKind kind) {
+  return 1 << ((uint8_t)kind + 1);
+}
+
+inline bool isColliding(CollisionKind kind, CollisionSet const& collisionSet) {
+  return collisionSet.contains(kind);
+}
+
+inline bool isSolidColliding(CollisionKind kind) {
+  return isColliding(kind, DefaultCollisionSet);
+}
+
+inline CollisionKind maxCollision(CollisionKind first, CollisionKind second) {
+  return max(first, second);
+}
+
+inline CollisionBlock CollisionBlock::nullBlock(Vec2I const& space) {
+  CollisionBlock block;
+  block.kind = CollisionKind::Null;
+  block.space = space;
+  block.poly = {
+    Vec2F(space) + Vec2F(0, 0),
+    Vec2F(space) + Vec2F(1, 0),
+    Vec2F(space) + Vec2F(1, 1),
+    Vec2F(space) + Vec2F(0, 1)
+  };
+  block.polyBounds = RectF::withSize(Vec2F(space), Vec2F(1, 1));
+  return block;
+}
+
+}
+
+#endif