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render3d: gpu_tex_read_all and gpu_tex_write_all flush the frame first - the read-back is a submit of its own and took the image before the draws that fill it (the sky bake's BRDF table was all zeros at one width in three)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 23:18:05 +03:00
parent b5b3edc6ec
commit 92530c5db7
2 changed files with 11 additions and 1 deletions
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6
packages/ludic.render3d/gpu_vk_readback.ludic
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@ -36,8 +36,11 @@ function gvk_tex_read_layer(render3d_st: mut Render3dState, tex: int, layer: int
return ok
}
# every layer's level 0 into `out` (gpu_tex_byte_size bytes), layer after layer
# every layer's level 0 into `out` (gpu_tex_byte_size bytes), layer after layer. The frame so far goes
# first: the copy is a submit of its own, and read before the draws that fill the texture were submitted
# it took whatever the image held - a bake of the sky's BRDF table came out all zeros at one width in three
function gpu_tex_read_all(render3d_st: mut Render3dState, tex: int, out: pointer) -> bool {
gvk_flush(render3d_st)
let layers = render3d_st.gvk_tex_layers[tex]
let per = gpu_tex_byte_size(render3d_st, tex) / max(layers, 1)
for l in 0 .. layers { if not gvk_tex_read_layer(render3d_st, tex, l, mem_off(out, l * per)) { return false } }
@ -47,6 +50,7 @@ function gpu_tex_read_all(render3d_st: mut Render3dState, tex: int, out: pointer
# level 0 of every layer written from bytes read back by gpu_tex_read_all; the texture's storage must
# already be what it was (same format, size and layers). Mips, where it has them, are the caller's
function gpu_tex_write_all(render3d_st: mut Render3dState, tex: int, data: pointer) -> bool {
gvk_flush(render3d_st) # after whatever the frame so far drew into it
let ifmt = render3d_st.gvk_tex_glfmt[tex]
let c = gvk_channels(ifmt)
let b = gvk_channel_bytes(ifmt)