Orkuncakilkaya
6c690c5db6
ludic.lab: lab_png_write / lab_png_write_from (raw 8-bit, 1-4 channels, stored deflate) in png_write.ludic, importable alone with its own LabPngState; png_convert.ludic's previews of float textures (R32F min..max, RG16F x255, HDR x/(1+x) + sRGB); lab_ppm_to_png on the same encoder. render3d: bake_load.ludic - impostor_from_baked / impostor_source / impostor_refill (a fog re-open reads the bake), sky_baked_in and sky_precompute trying the bake at the start yaw (sky_compute is the convolution, and sky_ibl_bytes always uses it), carpet_from_baked / carpet_bytes / carpet_finish, bake_part_count / _len / _off. Compile-only: nothing run. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
36 lines
1.2 KiB
Text
36 lines
1.2 KiB
Text
# png.ludic - the renderer writes a frame as a PPM; the lab keeps it as a PNG, stored rather than
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# compressed (png_write.ludic: a PNG anything opens, with no zlib here).
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# a PPM's header: "P6", width, height, maxval, each after white space; returns the pixel offset
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function lp_ppm_header(lab_st: mut LabState, d: []byte) -> int {
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var i = 2
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var got = 0
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var vals = new []int
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while got < 3 and i < len(d) {
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while i < len(d) and (d[i] == 32 or d[i] == 10 or d[i] == 13 or d[i] == 9) { i += 1 }
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var v = 0
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while i < len(d) and d[i] >= 48 and d[i] <= 57 {
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v = v * 10 + (d[i] - 48)
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i += 1
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}
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push(vals, v)
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got += 1
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}
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lab_st.lp_w = vals[0]
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lab_st.lp_h = vals[1]
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return i + 1
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}
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# the PPM at `ppm` as a PNG at `png`; the PPM is removed
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export function lab_ppm_to_png(lab_st: mut LabState, ppm: string, png: string) -> bool {
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let d = Fs.read_bytes(ppm)
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if d == null or len(d) < 8 { return false }
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let px = lp_ppm_header(lab_st, d)
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let w = lab_st.lp_w
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let h = lab_st.lp_h
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if px + w * h * 3 > len(d) { return false }
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let out = buffer(lp_png_size(w, h, 3))
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let n = lp_encode(lab_st.lp_table, w, h, 3, d, px, out)
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if not Fs.write_bytes(png, out, n) { return false }
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Fs.remove(ppm)
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return true
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}
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