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render3d: a glTF material's factors are drawn - base colour, roughness, metallic and emission

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gltf_factors reads pbrMetallicRoughness.baseColorFactor, metallicFactor, roughnessFactor and the
emissiveFactor into the primitive (pr.fac), and prim_factors hands them to every program that draws its
textures (actors, the scatter's meshes and levels, the impostor bake) as 1 - factor, so a program never
given them - or a material that gives none (pr.fac null) - multiplies by 1 and draws as before. An
untextured material with a colour (or a metal/roughness) samples a pure white for it, so the factor is
exactly what it draws: horse_cornea is its own colour, not the 200 grey every untextured part had.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 18:52:42 +03:00
parent d2e1f804ce
commit f79390838a
27 changed files with 221 additions and 114 deletions
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packages/ludic.render3d/actor.ludic
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@ -220,6 +220,7 @@ function actor_draw_one(render3d_st: mut Render3dState, a: Actor, ap: AcProg, sh
else { u_v3(render3d_st, ap.l_tint, a.tint) }
}
gpu_tex_unit(render3d_st, 0); gpu_tex_bind(render3d_st, GPU_TEX2D, pr.diff)
prim_factors(render3d_st, ap.prog, pr)
if not shadow {
gpu_tex_unit(render3d_st, 1); gpu_tex_bind(render3d_st, GPU_TEX2D, pr.nrm)
gpu_tex_unit(render3d_st, 2); gpu_tex_bind(render3d_st, GPU_TEX2D, pr.arm)