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Wall the city in and paste posters on it

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A 14 m concrete wall now encloses the city 24 m beyond its outermost
blocks. It is in the collision index (not the pick index), blocked on
the navigation grid so residents and routes stay inside, and walk/fly
positions are clamped within it so nobody leaves by flying over.

Posters are pasted on the city side at random spots, sizes and tilts
(up to 25 degrees), one per ~35 m, overlapping like a real hoarding.
They are painted into one atlas from civic slogans plus facts about the
loaded codebase (welcome, tallest tower, largest district, most
connected file), seeded by the repository name so each city's wall is
stable. The wall shader draws concrete courses and joints with a lit
coping, and the minimap outlines the wall. README covers routes,
residents, the wall and security alerts.
This commit is contained in:
Andy Dixon
2026-07-05 13:29:21 +01:00
parent a3f9ef2d9d
commit 630636b3af
6 changed files with 207 additions and 13 deletions
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web/renderer.js
+25 -2
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@@ -16,7 +16,7 @@ const VERTICES = new Float32Array([
]);
// Instance kinds in the box program.
export const KIND = { building: 0, block: 1, ground: 2, beacon: 3 };
export const KIND = { building: 0, block: 1, ground: 2, beacon: 3, wall: 4 };
const FLOATS_PER_INSTANCE = 16;
// Landscape heights are exaggerated relative to the 1000x680 map so small repositories still read as 3D.
@@ -107,6 +107,18 @@ void main(){
return;
}
if(vKind.x == 2){ outColor = vec4(fog(vec3(.03, .036, .052)), uAlpha); return; } // asphalt
if(vKind.x == 4){
// City wall: concrete courses and panel joints in metres, lit coping along the top.
vec2 faceUv = vFace == 0 || vFace == 5 ? vUnit.xy : vFace < 3 ? vUnit.xz : vUnit.yz;
float along = (vFace < 3 ? vUnit.x * vSize.x : vUnit.y * vSize.y), up = vUnit.z * vSize.z;
float joints = max(step(.97, fract(along / 6.0)), step(.95, fract(up / 2.8)));
vec3 concrete = vec3(.12, .13, .16) * (.65 + .35 * vUnit.z) * (1.0 - joints * .35);
if(vFace == 0) concrete = vec3(.2, .21, .26);
float edgeWall = min(min(faceUv.x, 1.0 - faceUv.x), min(faceUv.y, 1.0 - faceUv.y));
float rim = 1.0 - smoothstep(0.0, fwidth(edgeWall) * 1.5 + .002, edgeWall);
outColor = vec4(fog(mix(concrete, vec3(.55, .5, 1.0) * .8, rim * step(.9, vUnit.z + (vFace == 0 ? 1.0 : 0.0)))), uAlpha);
return;
}
#endif
if(uMode < .5 && vFace > 0) discard;
vec2 face = vFace == 0 || vFace == 5 ? vUnit.xy : vFace < 3 ? vUnit.xz : vUnit.yz;
@@ -418,7 +430,7 @@ export class LandscapeRenderer {
this.landscape = this.boxLayer(); this.cityLayer = this.boxLayer();
this.signProgram = program(gl, SIGN_VS, SIGN_FS); this.signUniforms = uniformsOf(gl, this.signProgram);
this.corners = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, this.corners); gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([0, 0, 1, 0, 0, 1, 1, 1]), gl.STATIC_DRAW);
this.signLayer = this.quadLayer(); this.facadeLayer = this.quadLayer();
this.signLayer = this.quadLayer(); this.facadeLayer = this.quadLayer(); this.posterLayer = this.quadLayer(); this.posterTexture = this.texture();
this.atlasTexture = this.texture(); this.facadeTexture = this.texture(); this.atlasGeneration = -1;
this.trailProgram = program(gl, TRAIL_VS, TRAIL_FS); this.trailUniforms = uniformsOf(gl, this.trailProgram);
this.trailLayer = { vao: gl.createVertexArray(), buffer: gl.createBuffer(), count: 0 };
@@ -487,6 +499,16 @@ export class LandscapeRenderer {
this.signLayer.count = quads.length;
}
// Posters on the city wall: a PosterAtlas and quads with uv rects; uploaded once per city.
setPosters(atlas, quads) {
const gl = this.gl;
gl.bindTexture(gl.TEXTURE_2D, this.posterTexture); gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, atlas.canvas); gl.generateMipmap(gl.TEXTURE_2D);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
gl.bindBuffer(gl.ARRAY_BUFFER, this.posterLayer.buffer); gl.bufferData(gl.ARRAY_BUFFER, LandscapeRenderer.packQuads(quads), gl.STATIC_DRAW);
this.posterLayer.count = quads.length;
}
// Source code on one wall: a canvas and its quad, or null to hide.
setFacade(canvas, quad) {
const gl = this.gl;
@@ -763,6 +785,7 @@ export class LandscapeRenderer {
this.syncAtlas();
gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA); gl.depthMask(false);
gl.enable(gl.POLYGON_OFFSET_FILL); gl.polygonOffset(-2, -8);
this.drawQuads(this.posterLayer, this.posterTexture);
this.drawQuads(this.facadeLayer, this.facadeTexture);
this.drawQuads(this.signLayer, this.atlasTexture);
gl.disable(gl.POLYGON_OFFSET_FILL); gl.depthMask(true); gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);