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carry: the runtime and render3d work Maroon Lake builds against

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Input.text, App.monitor_count / window_to_monitor / window_fixed,
gl_sleep_us, and the grass and collide changes, uncommitted on main and
depended on by the game; carried here so the language work starts from
what the game actually uses. main's working tree is untouched.
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-23 15:55:02 +03:00
parent 86492064aa
commit e6f565a6c4
17 changed files with 622 additions and 34 deletions
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25
packages/ludic.render3d/shaders/grass.vert
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@ -100,8 +100,16 @@ void main() {
// of the count shrinks to nothing so a blade never pops.
float spacing = u_s0 * (1.0 + dist / u_d0);
float count = CELL * CELL / (spacing * spacing) * (1.0 - smoothstep(u_radius * 0.7, u_radius, dist));
if (fj >= count) { cull(); return; }
float life = 1.0 - smoothstep(0.8, 1.0, fj / max(count, 1.0));
// WHICH blades thin out has to be random, not the last indices. `fj >= count` keeps
// blades 0..N-1, and as N falls by one with distance, the SAME index dies in every
// cell at the same radius - one blade in a fixed place per cell, over a whole ring.
// Seen from above that is a set of arcs centred on the camera, and at eye level it is
// the banding that reads as a ploughed field. Giving each blade its own fixed number
// and comparing that against the density makes the thinning scatter instead.
float keep = count / float(max(per_cell, 1));
float r = bladeHash(ci, j, 5);
if (r > keep) { cull(); return; }
float life = 1.0 - smoothstep(keep * 0.75, keep, r);
// the ground under it
vec2 huv = (xz - u_ts_origin) / (2.0 * u_ts_half) + 0.5;
if (huv.x < 0.0 || huv.x > 1.0 || huv.y < 0.0 || huv.y > 1.0) { cull(); return; }
@ -136,7 +144,11 @@ void main() {
if ((u_dbg & 1) != 0) h += 0.3;
// the blade: sized so that coverage stays level as the spacing grows
float seed = hv.x * 0.7 + hv.y * 0.3;
float ang = hv.y * 6.2831853;
// A BLADE'S YAW MUST NOT BE ITS POSITION. This was `hv.y * 2pi`, and hv.y is the same
// number that places the blade along the cell's z - so every blade at the same depth
// in a cell faced the same way, in rows, sixteen metres wide. That is the single thing
// that made the meadow look ploughed. Its own hash costs nothing.
float ang = bladeHash(ci, j, 6) * 6.2831853;
float s = sin(ang), c_ = cos(ang);
float grow = spacing / u_s0; // 1 at the camera, growing with distance
// Height is biased SHORT rather than spread evenly. A meadow is not one length of grass: it
@ -146,7 +158,12 @@ void main() {
// that had been cut, which is the one thing an alpine meadow is not.
float hh = h3 * h3;
float tall = mix(0.09, 0.60, hh) * mix(0.8, 1.2, hash1(cid * 0.1)) * (1.0 + 0.35 * smoothstep(1.0, 12.0, grow)) * life;
float bw = 0.028 * mix(1.0, 0.45 * grow, smoothstep(1.0, 4.0, grow));
// 2.8 cm was FIVE TIMES a blade of meadow grass, which is 3-6 mm. At 2 m from the
// camera that is a broad dark scimitar lying along the ground rather than a blade
// standing in a sward, and no amount of profile or colour work fixes a blade that is
// the wrong size. Measured, not guessed: it is the one number behind every "too wide
// and too flat" note in this stage.
float bw = 0.010 * mix(1.0, 0.45 * grow, smoothstep(1.0, 4.0, grow));
if (far) { bw = max(bw, spacing * 0.35); tall = min(tall, spacing * 0.3); }
vec3 p = vec3(a_pos.x * bw, a_pos.y * tall, a_pos.z * tall * (0.6 + 0.8 * h4));
vec3 n = vec3(0.0, 0.3, 1.0);