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render3d: the height field and photograph on the CPU as tiles read from a file (off until the game asks)

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terrain_tiles_to(dir, key) before a map is made: once made, its heights, photograph and baked normals
are written tile by tile (64 m, TT_TEX) to <dir>/<key>.tiles - fresh every time, header last, so no
other generator's or a torn file is ever read - and the whole copies go. Every read goes through the
tile: resident, else read from the file there and then into a 2048-tile clock, so terrain_height,
terrain_height_smooth, terrain_ortho* and terrain_chunk_heights answer exactly what the whole copy
did (R3D_TT_CHECK: worst 0.0 m over 4000 points) whatever is resident - two machines and the boot's
placements agree to the bit. terrain_chunk_heights takes render3d_st mut for it.

terrain_height_near(read-only): the tile if it is in, else a coarse 2048^2 level (worst 0.91 m), never
the file - for line checks that must not take render3d_st mut. terrain_texel() is the texel size,
terrain_tiles_prefetch(x, z, r, budget) reads ahead, and a frame that reads more than 8 tiles says so
once. R3D_TERRAIN_TILES=<dir> turns it on for a run.

At the overlook with MallocLargeCache=0: 1731 MB off, 1658 MB on; 192 MB written in ~200 ms; the
frame unchanged (0 pixels over 8).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 16:53:28 +03:00
parent c5e58d14ea
commit 5b3cfac48e
8 changed files with 385 additions and 15 deletions
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3
packages/ludic.render3d/render.ludic
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@ -77,6 +77,8 @@ function r3d_env_flags(render3d_st: mut Render3dState) -> void {
render3d_st.r3d_no_trees = r3d_env_has(render3d_st, "R3D_NOTREES")
render3d_st.r3d_no_refl = r3d_env_has(render3d_st, "R3D_NOREFL")
# R3D_FOG_WALL=<m>: the fog wall at that distance, for a shot (a game sets it with r3d_fog_wall)
# R3D_TERRAIN_TILES=<dir>: the height field and photograph as tiles in that directory (terrain_tiles_to)
if r3d_env_has(render3d_st, "R3D_TERRAIN_TILES") and render3d_st.tt_dir == "" { terrain_tiles_to(render3d_st, r3d_env(render3d_st, "R3D_TERRAIN_TILES"), "terrain") }
if r3d_env_has(render3d_st, "R3D_FOG_WALL") { render3d_st.r3d_fog_wall = float(Text.to_int(r3d_env(render3d_st, "R3D_FOG_WALL"))) }
if r3d_env_has(render3d_st, "R3D_DEBUG") { render3d_st.r3d_debug = true }
if r3d_env_has(render3d_st, "R3D_DBGSHADOW") { render3d_st.r3d_debug_shadow = true }
@ -224,6 +226,7 @@ function r3d_frame__t(render3d_st: mut Render3dState, time: float) -> void {
# a stale attachment or a texture freed twice shows up.
render3d_st.r3d_test_frame += 1
vkmem_tick(render3d_st)
tt_frame(render3d_st)
fog_at_tick(render3d_st)
if render3d_st.r3d_test_resize == 0 and r3d_env_has(render3d_st, "R3D_RESIZE_AT") { render3d_st.r3d_test_resize = Text.to_int(r3d_env(render3d_st, "R3D_RESIZE_AT")) }
# R3D_RESIZE_AT=<n>: from frame n on, rebuild every screen-sized buffer every few