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render3d: baked textures before the PNG - a png_decode takes assets/baked/png, a cut-out load assets/baked/cutouts

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baked_tex.ludic reads ludic.base's baked form by hand (render3d uses no package): the LBAK header, the
key ("png_sheets" / "cutouts", the Bakes rows) and the generator version, then the payload -
w, h, channels, depth and the samples for a PNG (the caller frees them as it would a decode), a whole
.dds for a cut-out (tex_load_dds_at: a .dds at an offset). Missing, or another key or version, and the
PNG path runs as before. Compiles with Maroon Lake (game, lab, lab/bake/textures).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 17:30:57 +03:00
parent 104ba696c2
commit 967f15ded9
5 changed files with 104 additions and 9 deletions
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20
packages/ludic.render3d/texture_dds.ludic
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@ -44,14 +44,16 @@ function tex_load_dds_bytes(render3d_st: mut Render3dState, b: []byte, srgb: boo
render3d_st.gvk_tag = was
return r
}
function tex_load_dds_bytes__t(render3d_st: mut Render3dState, b: []byte, srgb: bool) -> int {
if len(b) < 148 or b[0] != 68 or b[1] != 68 or b[2] != 83 or b[3] != 32 { return 0 }
if b[84] != 68 or b[85] != 88 or b[86] != 49 or b[87] != 48 { return 0 } # "DX10"
let h = dds_u32(b, 12)
let w = dds_u32(b, 16)
var levels = dds_u32(b, 28)
function tex_load_dds_bytes__t(render3d_st: mut Render3dState, b: []byte, srgb: bool) -> int { return tex_load_dds_at(render3d_st, b, 0, srgb) }
# a .dds that starts `at` bytes into b (a baked file's payload, baked_tex.ludic)
function tex_load_dds_at(render3d_st: mut Render3dState, b: []byte, at0: int, srgb: bool) -> int {
if len(b) < at0 + 148 or b[at0] != 68 or b[at0 + 1] != 68 or b[at0 + 2] != 83 or b[at0 + 3] != 32 { return 0 }
if b[at0 + 84] != 68 or b[at0 + 85] != 88 or b[at0 + 86] != 49 or b[at0 + 87] != 48 { return 0 } # "DX10"
let h = dds_u32(b, at0 + 12)
let w = dds_u32(b, at0 + 16)
var levels = dds_u32(b, at0 + 28)
if levels < 1 { levels = 1 }
let dxgi = dds_u32(b, 128)
let dxgi = dds_u32(b, at0 + 128)
var ifmt = 0
var block = 16
if dxgi == DDS_BC7 or dxgi == DDS_BC7_SRGB { ifmt = R3D_BC7; if srgb { ifmt = R3D_BC7_SRGB } }
@ -65,13 +67,13 @@ function tex_load_dds_bytes__t(render3d_st: mut Render3dState, b: []byte, srgb:
at += max((max(w >> l, 1) + 3) / 4, 1) * max((max(h >> l, 1) + 3) / 4, 1) * block
}
offs[levels] = at
if 148 + at > len(b) {
if at0 + 148 + at > len(b) {
free(offs)
return 0
}
let id = gpu_tex_new(render3d_st)
gpu_tex_bind(render3d_st, GPU_TEX2D, id)
let ok = gpu_tex_compressed(render3d_st, ifmt, w, h, levels, mem_off(data_of(b), 148), offs)
let ok = gpu_tex_compressed(render3d_st, ifmt, w, h, levels, mem_off(data_of(b), at0 + 148), offs)
free(offs)
if not ok {
gpu_tex_free(render3d_st, id)