add platforms and AABB collision

1 files changed, 43 insertions, 9 deletions

diff --git a/src/player.odin b/src/player.odin
index e098167..1dd79ae 100644
--- a/src/player.odin
+++ b/src/player.odin
@@ -2,7 +2,6 @@ package demonchime
 
 import "core:fmt"
 import "core:math"
-import "core:math/linalg"
 
 import sapp "shared:sokol/app"
 
@@ -13,11 +12,12 @@ Player :: struct {
   vel: Vec2,
   anim: draw.Animation,
   sprite: draw.Sprite,
+  on_floor: bool
 }
 
 PLAYER_SPEED :: 100
 PLAYER_ACCEL :: 10
-PLAYER_JUMP_FORCE :: 300
+PLAYER_JUMP_FORCE :: 350
 
 init_player :: proc(p: ^Player) {
   p.pos = Vec2{50, 50}
@@ -58,7 +58,7 @@ update_player :: proc(p: ^Player, dt: f32) {
     draw.set_sprite_active_tag(&p.sprite, "down_idle")
   }
 
-  if is_keybind_down(state.input, state.input.jump) && p.pos.y >= 256 {
+  if is_keybind_down(state.input, state.input.jump) && p.on_floor {
     p.vel.y = -PLAYER_JUMP_FORCE
   }
 
@@ -69,18 +69,52 @@ update_player :: proc(p: ^Player, dt: f32) {
   )
   p.vel.y = math.min(p.vel.y + GRAVITY * dt, TERMINAL_VELOCITY)
 
-  p.pos += p.vel * dt
-  
-  if p.pos.y > 256 {
-    p.pos.y = 256
-    p.vel.y = 0
+  res_pos := p.pos + p.vel * dt
+
+  rect_size := Vec2{f32(p.sprite.width), f32(p.sprite.height)}
+  rect_offset := Vec2{-rect_size.x / 2, -rect_size.y}
+
+  rect := Rect{
+    res_pos + rect_offset,
+    rect_size,
   }
 
+  p.on_floor = false
+
+  iter := iter_entity_list(state.platform_list)
+  for plat in entity_list_iter(&iter) {
+    if aabb(rect, plat.rect) {
+      prev_rect := Rect{
+        p.pos + rect_offset,
+        rect_size,
+      }
+      if aabb_hori(prev_rect, plat.rect) {
+        if p.vel.y > 0 {
+          res_pos.y = plat.rect.start.y - rect.size.y - rect_offset.y
+          p.on_floor = true
+        } else {
+          res_pos.y = plat.rect.start.y + plat.rect.size.y - rect_offset.y
+        }
+        p.vel.y = 0
+      } else if aabb_vert(prev_rect, plat.rect) {
+        if p.vel.x > 0 {
+          res_pos.x = plat.rect.start.x - rect.size.x - rect_offset.x
+        } else {
+          res_pos.x = plat.rect.start.x + plat.rect.size.x - rect_offset.x
+        }
+        p.vel.x = 0
+      }
+    }
+  }
+
+  p.pos = res_pos
+
   p.sprite.pos = p.pos
 
   draw.update_sprite(&p.sprite, dt)
 }
 
 draw_player :: proc(p: Player) {
-  draw.draw_sprite(&state.renderer, p.sprite)
+  draw.sprite(&state.renderer, p.sprite)
 }
+