6 files changed, 94 insertions, 4 deletions
diff --git a/src/systems/input.c b/src/systems/input.c
index 292d438..0c8f768 100644
--- a/src/systems/input.c
+++ b/src/systems/input.c
@@ -1,11 +1,17 @@
 #include "input.h"
 
+#include <assert.h>
 #include <glfw3.h>
+#include <string.h>
 
 #include "log.h"
 
+static input_state *g_input;  // Use a global to simplify caller code
+
 bool input_system_init(input_state *input, GLFWwindow *window) {
   INFO("Input init");
+  memset(input, 0, sizeof(input_state));
+
   input->window = window;
   // Set everything to false. Could just set memory to zero but where's the fun in that
   for (int i = 0; i < KEYCODE_MAX; i++) {
@@ -14,10 +20,19 @@ bool input_system_init(input_state *input, GLFWwindow *window) {
     input->just_released_keys[i] = false;
   }
 
+  g_input = input;
+
+  assert(input->mouse.x_delta == 0);
+  assert(input->mouse.y_delta == 0);
+
+  INFO("Finish input init");
   return true;
 }
 
+void input_system_shutdown(input_state *input) {}
+
 void input_update(input_state *input) {
+  glfwPollEvents();
   // --- update keyboard input
 
   // if we go from un-pressed -> pressed, set as "just pressed"
@@ -75,3 +90,9 @@ void input_update(input_state *input) {
 
   input->mouse = new_mouse_state;
 }
+
+bool key_is_pressed(keycode key) { return g_input->depressed_keys[key]; }
+
+bool key_just_pressed(keycode key) { return g_input->just_pressed_keys[key]; }
+
+bool key_just_released(keycode key) { return g_input->just_released_keys[key]; }
+\ No newline at end of file
diff --git a/src/systems/keys.h b/src/systems/keys.h
index 090bb49..a76e101 100644
--- a/src/systems/keys.h
+++ b/src/systems/keys.h
@@ -2,5 +2,18 @@
 
 typedef enum keycode {
   // TODO: add all keycodes
-  KEYCODE_MAX
+  KEYCODE_SPACE = 32,
+  KEYCODE_A = 65,
+  KEYCODE_D = 68,
+  KEYCODE_S = 83,
+  KEYCODE_W = 87,
+  KEYCODE_ESCAPE = 256,
+  KEYCODE_ENTER = 257,
+  KEYCODE_TAB = 258,
+  KEYCODE_BACKSPACE = 259,
+  KEYCODE_KEY_RIGHT = 262,
+  KEYCODE_KEY_LEFT = 263,
+  KEYCODE_KEY_DOWN = 264,
+  KEYCODE_KEY_UP = 265,
+  KEYCODE_MAX = 348
 } keycode;
 \ No newline at end of file
diff --git a/src/systems/screenspace.h b/src/systems/screenspace.h
index 2250847..5f0c579 100644
--- a/src/systems/screenspace.h
+++ b/src/systems/screenspace.h
@@ -25,7 +25,7 @@ struct draw_circle {
 
 /** @brief Tagged union that represents a UI shape to be drawn. */
 typedef struct draw_cmd {
-  enum { RECT, CIRCLE } draw_cmd_type;
+  enum { DRAW_RECT, CIRCLE } draw_cmd_type;
   union {
     struct draw_rect rect;
     struct draw_circle circle;
@@ -37,7 +37,7 @@ KITC_DECL_TYPED_ARRAY(draw_cmd)
 typedef struct screenspace_state {
   u32 rect_vbo;
   u32 rect_vao;
-  shader rect_shader;
+  // shader rect_shader;
   draw_cmd_darray* draw_cmd_buf;
 } screenspace_state;
 
diff --git a/src/systems/terrain.c b/src/systems/terrain.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/systems/terrain.c
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
diff --git a/src/systems/text.h b/src/systems/text.h
index 19248a6..f40cfd6 100644
--- a/src/systems/text.h
+++ b/src/systems/text.h
@@ -7,6 +7,7 @@
 
 #include "darray.h"
 #include "defines.h"
+#include "ral.h"
 #include "render_types.h"
 
 struct core;
@@ -29,7 +30,7 @@ KITC_DECL_TYPED_ARRAY(draw_text_packet)
 
 typedef struct text_system_state {
   font default_font;
-  shader glyph_shader;
+  shader_handle glyph_shader;
   u32 glyph_vbo;
   u32 glyph_vao;
   draw_text_packet_darray *draw_cmd_buf;