From 5470826fd6a3ed5ad8af947239ee2fc1d1058cac Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Sat, 10 Aug 2024 12:27:32 +0200
Subject: Update landscape

---
 examples/landscape.c | 135 ++++++---------------------------------------------
 1 file changed, 14 insertions(+), 121 deletions(-)

diff --git a/examples/landscape.c b/examples/landscape.c
index 624183e..018242b 100755
--- a/examples/landscape.c
+++ b/examples/landscape.c
@@ -180,21 +180,7 @@ Platform platform = {0};
 #define EPS 1e-8
 
 enum {
-  F_ENABLED = 1,
-  F_HIDDEN  = 2,
-
-  TILE_NONE = 0,
-  TILE_GROUND,
-  TILE_ROCK,
-  TILE_GRASS,
-
-  ENTITY_NONE = 0,
-  ENTITY_STONE,
-  ENTITY_TREE,
-  ENTITY_CABIN,
-
-  MAX_NUM_TILES    = 10 * 1024 * 1024,
-  MAX_NUM_ENTITIES = 10 * 1024 * 1024,
+  MAX_NUM_TILES = 10 * 1024 * 1024,
 };
 
 typedef struct {
@@ -227,41 +213,20 @@ typedef struct {
 } Screen_Area;
 
 typedef struct {
-  u32 flags;
-  u16 id;
-  u16 variation;
-  f64 height;
-  f64 water;
-} Tile;
-
-typedef struct {
-  u32  flags;
-  i32  version;
-  u16  type;
-  u16  variation;
-  f64  size;
   i64  time;
-  Vec3 position;
-} Entity;
-
-typedef struct {
-  i64    time;
-  i32    map_num_x;
-  i32    map_num_y;
-  Tile   map[MAX_NUM_TILES];
-  i32    num_entities;
-  i32    next_entity;
-  Entity entities[MAX_NUM_ENTITIES];
-  f64    screen_distance;
-  f64    zoom;
-  f64    tilt;
-  Vec3   eye_position;
-  Vec3   right;
-  Vec3   up;
-  Vec3   forward;
-  Vec3   screen_x_axis;
-  Vec3   screen_y_axis;
-  Vec3   screen_z_axis;
+  i32  map_num_x;
+  i32  map_num_y;
+  f64  map[MAX_NUM_TILES];
+  f64  screen_distance;
+  f64  zoom;
+  f64  tilt;
+  Vec3 eye_position;
+  Vec3 right;
+  Vec3 up;
+  Vec3 forward;
+  Vec3 screen_x_axis;
+  Vec3 screen_y_axis;
+  Vec3 screen_z_axis;
 } World;
 
 #define CHECK(fail_return, condition) \
@@ -269,9 +234,6 @@ typedef struct {
   if (!(condition))                   \
     return fail_return;
 
-#define Y(flags, mask) (((flags) & (mask)) == (mask))
-#define N(flags, mask) (((flags) & (mask)) != (mask))
-
 World world = {0};
 
 f64 dot(Vec3 a, Vec3 b) {
@@ -397,59 +359,6 @@ Vec3 screen_to_world(i32 x, i32 y) {
   return add(world.eye_position, r);
 }
 
-Handle e_create_in(i32 index, Entity data) {
-  CHECK((Handle) {0}, index < MAX_NUM_ENTITIES);
-  CHECK((Handle) {0}, N(world.entities[index].flags, F_ENABLED));
-  Handle h = {
-    .index   = index,
-    .version = world.entities[index].version + 1,
-  };
-  world.entities[index]          = data;
-  world.entities[index].version  = h.version;
-  world.entities[index].flags   |= F_ENABLED;
-  while (Y(world.entities[world.next_entity].flags, F_ENABLED)) {
-    ++world.next_entity;
-    CHECK(h, world.next_entity < MAX_NUM_ENTITIES);
-  }
-  if (world.num_entities <= index)
-    world.num_entities = index + 1;
-  return h;
-}
-
-Handle e_create(Entity data) {
-  return e_create_in(world.next_entity, data);
-}
-
-void e_destroy(Handle id) {
-  CHECK(, world.entities[id.index].version == id.version);
-  CHECK(, Y(world.entities[id.index].flags, F_ENABLED));
-  world.entities[id.index].flags = 0;
-  if (world.next_entity > id.index)
-    world.next_entity = id.index;
-}
-
-void e_render(i32 index) {
-  Entity *e = world.entities + index;
-  CHECK(, Y(e->flags, F_ENABLED));
-  if (Y(e->flags, F_HIDDEN))
-    return;
-
-  Screen_Area a = world_to_screen(e->position, e->size);
-
-  i32 nx = (i32) floor(a.x    + .5);
-  i32 ny = (i32) floor(a.y    + .5);
-  i32 ns = (i32) floor(a.size + .5);
-
-  if (!a.visible)
-    return;
-
-  for (i64 j = -ns; j <= ns; ++j)
-    if (ny + j >= 0 && ny + j < platform.frame_height)
-      for (i64 i = -ns; i <= ns; ++i)
-        if (nx + i >= 0 && nx + i < platform.frame_width)
-          platform.pixels[(ny + j) * platform.frame_width + (nx + i)] = 0x00ff00;
-}
-
 i64 time_milliseconds() {
   struct timespec t;
   timespec_get(&t, TIME_UTC);
@@ -521,19 +430,6 @@ i32 main(i32 argc, c8 **argv) {
         world.eye_position.y += platform.cursor_dy * k;
       }
 
-      if (platform.key_pressed[BUTTON_LEFT]) {
-        e_create((Entity) {
-          .size     = .1,
-          .position = screen_to_world(platform.cursor_x, platform.cursor_y),
-        });
-      }
-
-      if (platform.key_down[BUTTON_LEFT])
-        world.entities[world.num_entities - 1].position.z += .01 * time_elapsed;
-
-      for (i32 k = 0; k < world.num_entities; ++k)
-        world.entities[k].time += time_elapsed;
-
       world.time += time_elapsed;
     }
 
@@ -541,9 +437,6 @@ i32 main(i32 argc, c8 **argv) {
       for (i32 i = 0; i < platform.frame_width; ++i)
         platform.pixels[j * platform.frame_width + i] = background;
 
-    for (i32 k = 0; k < world.num_entities; ++k)
-      e_render(k);
-
     p_render_frame();
   }
 
-- 
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