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feat: threads

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This commit is contained in:
Dan Finch 2026-08-05 09:24:13 +02:00
parent 6fb46573da
commit 46e7070b6b
18 changed files with 878 additions and 125 deletions
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9
engine/render/Sky.ts
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@ -64,8 +64,9 @@ export namespace Sky {
* block and is copied across it. The sky is low-frequency, so 2 is nearly free
* visually and quarters the cloud cost; 1 is full resolution.
*/
export function render(fb: Framebuffer, camera: Camera, sky: SkyConfig, time: number, step = 1): void {
export function render(fb: Framebuffer, camera: Camera, sky: SkyConfig, time: number, step = 1, y0 = 0, y1 = -1): void {
const { width, height, color, depth } = fb
const bottom = y1 < 0 ? height : y1
const forward = Camera.forward(camera)
const right = Vec3.normalize(Vec3.cross(forward, UP))
const up = Vec3.cross(right, forward)
@ -76,11 +77,13 @@ export namespace Sky {
const clouds = sky.clouds
const cloud: CloudSample = { cover: 0, shade: 1 }
const s = Math.max(1, step | 0)
for (let by = 0; by < height; by += s) {
// Band `y0`..`bottom` must be step-aligned (callers ensure it) so the block
// grid stays global and neighboring bands don't seam.
for (let by = y0; by < bottom; by += s) {
// Shade at the block center, then flood the whole block with that color.
const sampleY = Math.min(height - 1, by + (s >> 1))
const ndcY = 1 - ((sampleY + 0.5) / height) * 2
const yEnd = Math.min(height, by + s)
const yEnd = Math.min(bottom, by + s)
for (let bx = 0; bx < width; bx += s) {
const sampleX = Math.min(width - 1, bx + (s >> 1))
const ndcX = ((sampleX + 0.5) / width) * 2 - 1