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render3d: terrain tiles for a map with no photograph (Lamar)

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The tiles' photograph side is 0 when the map has none: no photograph or coarse photograph sections, no
decode, ter_o answers 0, and no coarse photograph texture - as such a map has always drawn. The cut and
terrain_tiles_bake no longer require one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 17:40:39 +03:00
parent 199109f1ae
commit f02eab5c51
4 changed files with 30 additions and 14 deletions
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10
packages/ludic.render3d/terrain_ltt2_write.ludic
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@ -12,7 +12,9 @@ const LT_HEAD: int = 128 # 32 words
@alloc_ok("a map being made or baked: the tiles written once")
function ltt2_write(render3d_st: mut Render3dState, f: pointer, base: int) -> int {
let n = TERRAIN_RES / TT_TEX
let side = render3d_st.ter_ortho_w / n
# a map with no photograph (Lamar's ground is painted by its materials) has no photograph sections
var side = 0
if render3d_st.ter_ortho_px != null { side = render3d_st.ter_ortho_w / n }
let head = words(32)
for k in 0 .. 32 { head[k] = 0 }
file_write(f, data_of(head), LT_HEAD)
@ -20,11 +22,13 @@ function ltt2_write(render3d_st: mut Render3dState, f: pointer, base: int) -> in
head[8] = at; at += ltt2_write_heights(render3d_st, f, n)
let nrm = ltt2_normals_back(render3d_st)
head[10] = at; at += ltt2_write_normals(f, nrm, n)
head[11] = at; at += ltt2_write_ortho(render3d_st, f, n, side)
head[11] = at
if side > 0 { at += ltt2_write_ortho(render3d_st, f, n, side) }
head[12] = at; at += ltt2_write_coarse_h(render3d_st, f)
head[13] = at; at += ltt2_write_coarse_n(f, nrm)
free(nrm)
head[14] = at; at += ltt2_write_coarse_o(render3d_st, f)
head[14] = at
if side > 0 { at += ltt2_write_coarse_o(render3d_st, f) }
head[0] = LT_MAGIC; head[1] = LT_VERSION; head[2] = TT_TEX; head[3] = n; head[4] = side
head[5] = TERRAIN_RES; head[6] = render3d_st.ter_ortho_w; head[7] = TT_COARSE; head[15] = at
file_seek(f, base, 0)