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feat(render3d): read the SPIR-V manifest the way a Vulkan backend will

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gpu_manifest.ludic loads shaders/spv/manifest.txt and answers what a backend asks while drawing:
which variant a program built by r3d_program is, where a uniform lives in its stage's block,
which binding a sampler has, what the vertex inputs are. examples/rendering/vk_manifest.ludic
resolves every program in variants.list against it (45 of 45) and checks a few offsets and
bindings. Nothing imports it yet.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 10:41:43 +03:00
parent 78c1f4f9ca
commit f97d54aa2a
2 changed files with 164 additions and 0 deletions
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examples/rendering/vk_manifest.ludic Normal file
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# vk_manifest.ludic — reads render3d's SPIR-V manifest the way the Vulkan backend will,
# and checks every program in variants.list resolves, with its uniforms and samplers.
# bin/ludicc examples/rendering/vk_manifest.ludic --headless -o build/vk_manifest && build/vk_manifest
program VkManifest {
import "../../packages/ludic.render3d/gpu_manifest.ludic"
property Marker { on: int = 1 }
model Anchor { Marker }
handler Boot phase Start {
spawn Anchor {}
let n = gpu_manifest_load("packages/ludic.render3d/shaders/spv/manifest.txt")
print(`manifest: {n} programs`)
var ok = n > 0
let list = Fs.read_text("packages/ludic.render3d/shaders/variants.list")
let lines = Text.split(list, "\n")
var listed = 0
var found = 0
for i in 0 .. len(lines) {
let ln = Text.trim(lines[i])
let lp: pointer = ln
if len(lp) == 0 or lp[0] == '#' { continue }
let parts = Text.split(ln, "|")
var defs = ""
if len(parts) > 2 { defs = parts[2] }
listed += 1
let v = gpu_variant_find_key(parts[0], parts[1], defs)
if v == null { print(` NOT FOUND: {ln}`); ok = false } else { found += 1 }
}
print(`variants.list: {listed} listed, {found} resolved`)
if found != listed { ok = false }
# spot checks against what the tool wrote: the lit foliage program as scatter builds it
let fol = gpu_variant_find("model.vert", "model.frag", "#define FOLIAGE\n#define WIND\n#define ALPHA_TEST\n")
if fol == null { print(" the foliage program did not resolve"); ok = false }
else {
let uv = gpu_variant_uniform(fol, 0, "u_view")
let us = gpu_variant_uniform(fol, 1, "u_sun_dir")
print(`foliage {fol.id}: vertex block {fol.vblock} bytes, fragment block {fol.fblock} bytes, {len(fol.u_name)} uniforms, {len(fol.t_name)} samplers, {len(fol.i_name)} vertex inputs`)
if uv >= 0 { print(` u_view (vertex) at {fol.u_off[uv]}, {fol.u_type[uv]}`) } else { print(" u_view missing from the vertex stage"); ok = false }
if us >= 0 { print(` u_sun_dir (fragment) at {fol.u_off[us]}, {fol.u_type[us]}`) } else { print(" u_sun_dir missing from the fragment stage"); ok = false }
let bd = gpu_variant_sampler(fol, "u_diff")
let bs = gpu_variant_sampler(fol, "u_shadow")
print(` u_diff binding {bd}, u_shadow binding {bs}`)
if bd < 2 or bs < 2 or bd == bs { ok = false }
}
if ok { print("VKMANIFEST OK") } else { print("VKMANIFEST FAILED") }
quit()
}
}