1 files changed, 65 insertions, 0 deletions
diff --git a/src/game/raycast.h b/src/game/raycast.h
new file mode 100644
index 0000000..5920e09
--- /dev/null
+++ b/src/game/raycast.h
@@ -0,0 +1,65 @@
+#pragma once
+
+#include "../util.h"
+
+const static U32 RAY_ITER_MAX = 10;
+const static U32 TRACE_HIT_NONE = (U32)-1;
+
+enum TraceHitType_t {
+  TH_NONE,
+  TH_WALL,
+  TH_CEILING,
+  TH_FLOOR
+};
+
+enum TraceFilter_t {
+  TF_NONE = 0x0,
+  TF_WALLS = 0x1,
+  TF_SPRITES = 0x2,
+  TF_ENTITIES = 0x4,
+
+  TF_WORLD = TF_WALLS | TF_SPRITES,
+  TF_ALL = TF_WALLS | TF_SPRITES | TF_ENTITIES,
+};
+
+struct TRACE {
+  /* input */
+  VEC3 startpos;
+  /* output*/
+  VEC3 endpos;
+  /* output */
+  F32  fract;
+  /* output */
+  F32  hitang;
+  /* output */
+  U32  hitwall;
+  /* input */
+  U32  filter;
+};
+
+struct RAY_HITDATA {
+  VEC3 point;
+  F32  dist;
+  F32  ang;
+
+  U8 type;
+  U32 obj_idx;
+};
+
+extern LIST<RAY_HITDATA> ray_trace_list( VEC3 start, F32 ang, U32 max_iter = RAY_ITER_MAX );
+extern LIST<RAY_HITDATA> ray_trace_list( VEC3 start, VEC3 end, U32 max_iter = RAY_ITER_MAX );
+
+extern U32 ray_trace( TRACE* tr, F32 ang );
+extern U32 ray_trace( TRACE* tr, VEC3 end );
+extern U32 ray_trace( TRACE* tr, VEC3 start, F32 ang );
+extern U32 ray_trace( TRACE* tr, VEC3 start, VEC3 end );
+
+extern VEC2 project_vertex(
+    VEC3 vertex_pos,
+    VEC3 player_pos,
+    F32 player_angle_deg,
+    F32 fov_deg,
+    VEC2 window,
+    VEC2 winsize,
+    U8* in_view = 0
+);