1 files changed, 55 insertions, 0 deletions
diff --git a/src/systems/terrain.h b/src/systems/terrain.h
new file mode 100644
index 0000000..bfd90b5
--- /dev/null
+++ b/src/systems/terrain.h
@@ -0,0 +1,55 @@
+/**
+ * @file terrain.h
+ * @author your name (you@domain.com)
+ * @brief
+ * @version 0.1
+ * @date 2024-04-27
+ *
+ * @copyright Copyright (c) 2024
+ *
+ */
+
+/*
+Future:
+ - Chunked terrain
+ - Dynamic LOD
+*/
+
+#include "defines.h"
+#include "maths_types.h"
+#include "mem.h"
+#include "render_types.h"
+#include "str.h"
+
+typedef struct heightmap {
+  str8 filepath;
+  u32x2 size;
+  void* image_data;
+  bool is_uploaded;
+} heightmap;
+
+typedef struct terrain_state {
+  arena terrain_allocator;
+  heightmap* heightmap;  // NULL = no heightmap
+} terrain_state;
+
+bool terrain_system_init(terrain_state* state);
+void terrain_system_shutdown(terrain_state* state);
+void terrain_system_render_hmap(renderer* rend, terrain_state* state);
+
+heightmap heightmap_from_image(str8 filepath);
+heightmap heightmap_from_perlin(/* TODO: perlin noise generation parameters */);
+
+/** @brief Get the height (the Y component) for a vertex at a particular coordinate in the heightmap
+ */
+f32 heightmap_height_at_xz(heightmap* hmap, f32 x, f32 z);
+
+/** @brief Calculate the normal vector of a vertex at a particular coordinate in the heightmap */
+vec3 heightmap_normal_at_xz(heightmap* hmap, f32 x, f32 z);
+
+/** @brief Generate the `geometry_data` for a heightmap ready to be uploaded to the GPU */
+geometry_data geo_heightmap(arena* a, heightmap heightmap);
+
+// somewhere there will be an easy way to add a heightmap
+
+// scene_add_heightmap
+\ No newline at end of file