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fix(shaders): varyings meet by name on Vulkan, so the meadow's flowers draw

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OpenGL links a vertex output to a fragment input by name; SPIR-V links them by location, and
glslang's --auto-map-locations numbered each stage in its own declaration order. The foliage
prepass's depth.frag declares v_wpos then v_uv where model.vert writes v_wpos, v_nrm, v_uv, so
the prepass read a normal as its texture coordinate, its alpha test cut every flower head and
leaf, and the lit pass (depth EQUAL) drew nothing over them. `ludic-dev shaders` now gives both
stages explicit locations: the vertex stage's out order numbers them and the fragment stage looks
each in up by name. All 45 variants checked: every fragment input sits on its vertex output.

Also:
- A clear still waiting for its pass when the framebuffer changes now runs on that framebuffer,
  instead of becoming the load op of whichever pass began next.
- R3D_DUMP_ATLAS writes every impostor and card atlas a run bakes (build/atlas_<n>_*.ppm); the
  40 baked on Vulkan match OpenGL's.

The PC's Vulkan frame now shows the flowers as OpenGL does, validation-clean. ludic-dev test 140
passed; OpenGL frames byte-identical at the five viewpoints; 59 self-tests pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 12:50:54 +03:00
parent a674c9b372
commit 66940f9c0a
8 changed files with 81 additions and 4 deletions
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10
packages/ludic.render3d/scatter.ludic
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@ -341,6 +341,8 @@ var sc_printed: bool = false
var sc_a2c: bool = true
function scatter_init() -> void {
# R3D_DUMP_ATLAS: every impostor and card atlas the run bakes, to build/atlas_<n>_{color,alpha}.ppm
sc_debug_dump = Os.has_env("R3D_DUMP_ATLAS")
sc_prog = r3d_program("model.vert", "model.frag", "")
sc_prog_fol = r3d_program("model.vert", "model.frag", "#define FOLIAGE\n#define WIND\n#define ALPHA_TEST\n")
sc_prog_fol_depth = r3d_program("model.vert", "depth.frag", "#define FOLIAGE\n#define WIND\n#define ALPHA_TEST\n")
@ -413,6 +415,7 @@ function layer_add(l: Layer, x: int, y: int, z: int, scale: int, yaw: int, seed:
# ---- impostors ---------------------------------------------------------------------
var sc_bake_flower: bool = false
var sc_dump_n: int = 0
function impostor_bake(model: Model, tiles: int, tw: int, th: int) -> Impostor {
let im = new Impostor
im.tiles = tiles
@ -475,7 +478,12 @@ function impostor_bake(model: Model, tiles: int, tw: int, th: int) -> Impostor {
gpu_tex_param(GPU_TEX2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR)
gpu_tex_mips(GPU_TEX2D)
gpu_check("impostor bake")
if sc_debug_dump { tex_dump_alpha = true; tex_dump(im.albedo, aw, th, "build/atlas_alpha.ppm"); tex_dump_alpha = false }
# numbered, so every bake of a run survives to be compared (a card layer per species bakes one)
if sc_debug_dump {
sc_dump_n += 1
tex_dump_alpha = true; tex_dump(im.albedo, aw, th, `build/atlas_{sc_dump_n}_alpha.ppm`); tex_dump_alpha = false
tex_dump(im.albedo, aw, th, `build/atlas_{sc_dump_n}_color.ppm`)
}
return im
}