From 70a92a88625f6ff1ec48d1d2636d894a0d407008 Mon Sep 17 00:00:00 2001
From: Orkuncakilkaya <orkuncakilkaya@gmail.com>
Date: Sun, 27 Sep 2026 23:07:28 +0300
Subject: [PATCH] fix(render3d): a refused pipeline is not retried every draw,
 and an evicted chunk is freed whole

gvk_pipeline_fast cached only pipelines it made, so one the driver refused was attempted again on
every draw, each attempt building its key string and create structs anew; the refusal is cached
too (a Vulkan program's variants are fixed when it is made, so it would fail the same way).
stream_evict made a new chunk list per eviction and never freed the evicted chunks' records; it
compacts the list in place and frees each evicted chunk with its data.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 packages/ludic.render3d/gpu_vk_draw.ludic |  3 ++-
 packages/ludic.render3d/stream.ludic      | 18 +++++++++++++-----
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/packages/ludic.render3d/gpu_vk_draw.ludic b/packages/ludic.render3d/gpu_vk_draw.ludic
index 5efb7f12..c8a5b294 100644
--- a/packages/ludic.render3d/gpu_vk_draw.ludic
+++ b/packages/ludic.render3d/gpu_vk_draw.ludic
@@ -1903,8 +1903,9 @@ function gvk_pipeline_fast(render3d_st: mut Render3dState, p: int, m: Mesh, st:
       return render3d_st.gvk_pc_pipe[k]
     }
   }
+  # a pipeline the driver refused is remembered as 0 too: retried on every draw, each try built its
+  # key and its create structs again and gave none of them back
   let pipe = gvk_pipeline(render3d_st, p, m, st, n_color, color_fmt, depth_fmt, samples)
-  if pipe == 0 { return pipe }
   push(render3d_st.gvk_pc_prog, p);  push(render3d_st.gvk_pc_layout, layout);  push(render3d_st.gvk_pc_state, state)
   push(render3d_st.gvk_pc_bias, bias);  push(render3d_st.gvk_pc_pass, pass);  push(render3d_st.gvk_pc_pipe, pipe)
   if p < 4096 { render3d_st.gvk_pc_last[p] = len(render3d_st.gvk_pc_prog) - 1 }
diff --git a/packages/ludic.render3d/stream.ludic b/packages/ludic.render3d/stream.ludic
index d5bde33a..754c9c4c 100644
--- a/packages/ludic.render3d/stream.ludic
+++ b/packages/ludic.render3d/stream.ludic
@@ -162,16 +162,24 @@ function stream_evict(render3d_st: mut Render3dState, s: Stream) -> void {
   }
   t = lo
   # everything wanted by the walk in progress stays whatever the threshold says
-  let kept = new []Chunk
+  # compacted in place, and an evicted chunk goes whole: a new list per eviction and the chunks'
+  # own records were never given back
+  var w = 0
   var i = 0
   while i < s.n {
     let c = s.chunks[i]
-    if c.used >= t or c.used == render3d_st.stream_walk_no { push(kept, c) }
-    else { if c.data != null { free(c.data) } }
+    if c.used >= t or c.used == render3d_st.stream_walk_no {
+      s.chunks[w] = c
+      w += 1
+    } else {
+      if c.data != null { free(c.data) }
+      free(c)
+    }
     i += 1
   }
-  s.chunks = kept
-  s.n = len(kept)
+  let ch = s.chunks
+  while len(ch) > w { List.pop(ch) }
+  s.n = w
   for h in 0 .. STREAM_HASH { s.htab[h] = 0 }
   i = 0
   while i < s.n { s.keys[i] = s.chunks[i].key;  stream_remember(s, s.chunks[i].key, i);  i += 1 }