From 7229daf49c35060898f7e6d791500c407ba7f4be Mon Sep 17 00:00:00 2001
From: jacob <jacob@cagori.com>
Date: Sun, 8 Jun 2025 14:10:27 -0500
Subject: [PATCH] draw collider fast path when radius=0

---
 src/draw.c | 36 +++++++++++++++++++++++++++---------
 src/draw.h |  2 +-
 src/user.c |  8 +++-----
 3 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/src/draw.c b/src/draw.c
index 777afbcc..59432a44 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -239,21 +239,39 @@ void draw_arrow_ray(struct gpu_handle cmd_list, struct v2 pos, struct v2 rel, f3
     draw_arrow_line(cmd_list, pos, end, thickness, arrowhead_height, color);
 }
 
-void draw_collider_line(struct gpu_handle cmd_list, struct xform draw_xf, struct collider_shape shape, struct xform shape_xf, f32 thickness, u32 color, u32 detail)
+void draw_collider_line(struct gpu_handle cmd_list, struct collider_shape shape, struct xform shape_xf, f32 thickness, u32 color, u32 detail)
 {
+    /* FIXME: Graphics bug when lots of colliders are drawn */
+    DEBUGBREAKABLE;
     struct arena_temp scratch = scratch_begin_no_conflict();
 
-    struct v2 *points = arena_push_array_no_zero(scratch.arena, struct v2, detail);
-    for (u32 i = 0; i < detail; ++i) {
-        f32 angle = ((f32)i / (f32)detail) * (2 * PI);
-        struct v2 dir = V2(math_cos(angle), math_sin(angle));
-        struct v2 p = collider_get_support_point(&shape, shape_xf, dir).p;
-        p = xform_mul_v2(draw_xf, p);
-        points[i] = p;
+    struct v2_array poly = ZI;
+
+    if (shape.radius == 0) {
+        poly.count = shape.count;
+        poly.points = arena_push_array_no_zero(scratch.arena, struct v2, shape.count);
+        for (u32 i = 0; i < shape.count; ++i) {
+            struct v2 p = xform_mul_v2(shape_xf, shape.points[i]);
+            poly.points[i] = p;
+        }
+    } else {
+        poly.count = detail;
+        poly.points = arena_push_array_no_zero(scratch.arena, struct v2, detail);
+        for (u32 i = 0; i < detail; ++i) {
+            f32 angle = ((f32)i / (f32)detail) * (2 * PI);
+            struct v2 dir = V2(math_cos(angle), math_sin(angle));
+            struct v2 p = collider_get_support_point(&shape, shape_xf, dir).p;
+            poly.points[i] = p;
+        }
     }
 
-    struct v2_array poly = { .points = points, .count = detail };
+    DEBUGBREAKABLE;
+#if 1
     draw_poly_line(cmd_list, poly, true, thickness, color);
+#else
+    draw_poly(cmd_list, poly, color);
+    (UNUSED)thickness;
+#endif
 
     scratch_end(scratch);
 }
diff --git a/src/draw.h b/src/draw.h
index 65d46988..f1e07477 100644
--- a/src/draw.h
+++ b/src/draw.h
@@ -69,7 +69,7 @@ void draw_arrow_line(struct gpu_handle cmd_list, struct v2 start, struct v2 end,
 
 void draw_arrow_ray(struct gpu_handle cmd_list, struct v2 pos, struct v2 rel, f32 thickness, f32 arrowhead_height, u32 color);
 
-void draw_collider_line(struct gpu_handle cmd_list, struct xform draw_xf, struct collider_shape shape, struct xform shape_xf, f32 thickness, u32 color, u32 detail);
+void draw_collider_line(struct gpu_handle cmd_list, struct collider_shape shape, struct xform shape_xf, f32 thickness, u32 color, u32 detail);
 
 /* ========================== *
  * Grid
diff --git a/src/user.c b/src/user.c
index cf44c0f8..937a2384 100644
--- a/src/user.c
+++ b/src/user.c
@@ -1226,7 +1226,7 @@ INTERNAL void user_update(void)
             b32 skip_debug_draw_transform = sim_ent_has_prop(ent, SEPROP_CAMERA);
             skip_debug_draw_transform = true;
 
-            struct xform sprite_xform = xf;
+            struct xform sprite_xform = xform_mul(xf, ent->sprite_local_xform);
 
             /* Draw tracer */
             if (sim_ent_has_prop(ent, SEPROP_TRACER)) {
@@ -1269,9 +1269,6 @@ INTERNAL void user_update(void)
             /* Draw sprite */
             //if ((false)) {
             if (!sprite_tag_is_nil(sprite)) {
-                /* Calculate sprite xform */
-                sprite_xform = xform_mul(xf, ent->sprite_local_xform);
-
                 /* Async load */
                 struct sprite_sheet *sheet = sprite_sheet_from_tag_async(sprite_frame_scope, sprite);
                 struct sprite_texture *texture = sprite_texture_from_tag_async(sprite_frame_scope, sprite);
@@ -1422,7 +1419,8 @@ INTERNAL void user_update(void)
                     {
                         /* Draw collider using support points */
                         u32 detail = 32;
-                        draw_collider_line(G.user_gpu_cmd_list, G.world_to_user_xf, collider, xf, thickness, color, detail);
+                        struct xform collider_draw_xf = xform_mul(G.world_to_user_xf, xf);
+                        draw_collider_line(G.user_gpu_cmd_list, collider, collider_draw_xf, thickness, color, detail);
                     }
                     {
                         /* Draw collider shape points */