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render3d: the blades' density window filled apart from its upload - gb_window_fill (the tiles round the camera's, zeros off the map, the corner) and gb_frame sends it; the same bytes, now readable by a test without a GPU

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-30 02:03:43 +03:00
parent 00b45742d1
commit 7c4e6870b3
2 changed files with 15 additions and 4 deletions
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5
changes/gb-window-fill.md Normal file
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@ -0,0 +1,5 @@
bump: patch
type: feature
**The blades' density window can be filled without a GPU.** grass_density.ludic's gb_frame is split: gb_window_fill
fills the GB_TILES x GB_TILES window of density tiles round the camera's (zeros off the map) and sets its corner,
and gb_frame sends it. The same bytes as before; a test reads gb_win after gb_window_fill.

14
packages/ludic.render3d/grass_density.ludic
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@ -54,13 +54,19 @@ function gb_frame(render3d_st: mut Render3dState) -> void {
let tx = (ctx - GB_TILES / 2) * GD_SIDE
let tz = (ctz - GB_TILES / 2) * GD_SIDE
if tx == render3d_st.gb_tx and tz == render3d_st.gb_tz { return }
gb_window_fill(render3d_st, ctx, ctz)
let side = GB_TILES * GD_SIDE
gpu_buffer_upload(render3d_st, render3d_st.gb_buf, side * side, data_of(render3d_st.gb_win), GPU_DYNAMIC)
}
# the window's bytes, on the CPU, for the camera in map tile (ctx, ctz): the GB_TILES x GB_TILES tiles round
# it, zeros off the map, and its corner (gb_tx, gb_tz) in texels. gb_frame sends it; a test reads gb_win
function gb_window_fill(render3d_st: mut Render3dState, ctx: int, ctz: int) -> void {
for j in 0 .. GB_TILES {
for i in 0 .. GB_TILES { gb_fill_tile(render3d_st, i, j, ctx - GB_TILES / 2 + i, ctz - GB_TILES / 2 + j) }
}
let side = GB_TILES * GD_SIDE
gpu_buffer_upload(render3d_st, render3d_st.gb_buf, side * side, data_of(render3d_st.gb_win), GPU_DYNAMIC)
render3d_st.gb_tx = tx
render3d_st.gb_tz = tz
render3d_st.gb_tx = (ctx - GB_TILES / 2) * GD_SIDE
render3d_st.gb_tz = (ctz - GB_TILES / 2) * GD_SIDE
}
# window tile (i, j) from the map's tile (mx, mz): its density bytes, four to a word; zeros off the map