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perf(render3d): the terrain's height and normal in R32F + RG16F, 128 MB where one RGBA32F was 256

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The first generation pass's R32F height is kept as ter_height_tex (not copied into an RGBA32F),
so every reader of the height - placement, the read-back, physics, selftest16's 9 mm - sees the
same 32 bits. ternormal.frag writes the baked normal's x and z into ter_normal_tex (RG16F), and
the six places that read it (terrain.frag twice, tersun.frag, grass.vert, grass.mesh,
grass_cull.comp, which takes a third texture at binding 6) rebuild y. SPIR-V regenerated.

Maroon Lake's play, headless Vulkan: 2793 -> 2647 MB. The camp's frame: 0.066% of pixels differ by
more than 8 (mean 0.024/255), isolated grass blades at the slope gate. ludic-dev test 307/307.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-28 02:31:18 +03:00
parent f1049953c4
commit 1675eb451f
26 changed files with 77 additions and 36 deletions
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5
packages/ludic.render3d/shaders/tersun.frag
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@ -12,13 +12,16 @@ in vec3 v_wpos;
in vec2 v_huv;
out float o_sh;
uniform sampler2D u_height;
// the baked terrain normal: x and z in RG16F, y rebuilt (a terrain normal always points up)
uniform sampler2D u_ter_normal;
vec3 terNormal(vec2 uv) { vec2 xz = texture(u_ter_normal, uv).rg; return vec3(xz.x, sqrt(max(1.0 - dot(xz, xz), 0.0)), xz.y); }
uniform mat4 u_view;
uniform float u_far_split;
uniform float u_far_band;
void main() {
vec3 p = v_wpos;
if (p.y < u_clip_y) discard;
vec3 N = normalize(texture(u_height, v_huv).gba);
vec3 N = terNormal(v_huv);
float dist = length(p - u_cam_pos);
float viewDepth = -(u_view * vec4(p, 1.0)).z;
// The same tier choice the ground makes, cross-faded over the same band: the near tier