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template <typename T>
bool operator()(T const* const* parameters, T* residuals) const {
    const T* inputs = parameters[0];
    size_t i = 0;
    for (size_t n = _constraints.size(); i < n; ++i) {
        T residual(0.0);
        const Constraint& constraint = _constraints[i];
        switch (constraint.type) {
            case ConstraintType::ArcLineTangent: {
                const auto& info = constraint.arc_line_tangent;

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Pipeline Cache

Vk:

• https://github.com/google/filament/blob/main/filament/backend/src/vulkan/VulkanPipelineCache.h
• https://github.com/google/filament/blob/main/filament/backend/src/vulkan/VulkanPipelineCache.cpp

Metal:

• https://github.com/google/filament/blob/main/filament/backend/src/metal/MetalState.h#L210-L255

Blitting / Depth Resolve Commits

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zstd is a C library that features very fast decompression (similar to snappy) and dictionary-based compression.

Asking zstd to perform best possible compression is slow, but decompressing the result is still fast.

It also has command tool:

brew install zstd

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#!/usr/bin/env python3

from nfft import nfft
import matplotlib.pyplot as plt
import numpy as np
from numpy.fft import fft

def gen_values(times: np.ndarray) -> np.ndarray:
    "Compose three waves."
    freq = 1

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#version 310 es

// glslc -std=310es -fshader-stage=vertex piecewise.glsl
// spirv-opt -Os a.spv -o b.spv
// spirv-cross b.spv

layout(binding = 0) uniform FrameUniforms {
  mat4 clipFromWorldMatrix;
} frameUniforms;

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* thread #3, name = 'FEngine::loop', stop reason = signal SIGSEGV: invalid address (fault address: 0x7fff00000000)
  * frame #0: 0x00007ffff2b6f37e libc.so.6`__libc_malloc + 286
    frame #1: 0x00007ffff32ac4b9 libvk_swiftshader.so`(anonymous namespace)::alignedMalloc(alignment=8, size=272) at memory.cpp:185:21
    frame #2: 0x00007ffff32ac1f8 libvk_swiftshader.so`(anonymous namespace)::DefaultAllocator::allocate(this=0x00007ffff7e22be8, request=0x00007ffff10a7a68) at memory.cpp:210:13
    frame #3: 0x00007ffff30d4763 libvk_swiftshader.so`std::shared_ptr<marl::Event::Shared> marl::Allocator::make_shared<marl::Event::Shared, marl::Allocator*&, marl::Event::Mode&, bool&>(this=0x00007ffff7e22be8, args=0x00007ffff10a7ab8, args=0x00007ffff10a7ac7, args=0x00007ffff10a7ac6) at memory.h:227:16
    frame #4: 0x00007ffff30d36c7 libvk_swiftshader.so`marl::Event::Event(this=0x0000000002071440, mode=Manual, initialState=false, allocator=0x00007ffff7e22be8) at event.h:187:25
    frame #5: 0x00007ffff30d35e3 libvk_swiftshad

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(1) cd ~/github/glslang/build
    git pull
    cmake ..
    sudo chown -R $(whoami) /usr/local/bin /usr/local/etc /usr/local/sbin /usr/local/share /usr/local/share/doc
    make install

(2) cd ~/github/Vulkan-Headers
    git pull
    rm -rf build ; mkdir -p build && cd build

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// clock all <button> with aria-label="Display the rich diff"

buttons = [].filter.call(
    document.getElementsByTagName('button'),
    el => el.getAttribute('aria-label') == "Display the rich diff");

buttons.forEach(el => el.click())

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val asset = modelViewer.asset!!
val rm = modelViewer.engine.renderableManager
for (entity in asset.entities) {
   val renderable = rm.getInstance(entity)
   if (renderable == 0) {
       continue
   }
   if (asset.getName(entity) == "Scheibe_Boden_0") {
       rm.setLayerMask(renderable, 0xff, 0x00)
   }

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private fun Int.getTransform(): Mat4 {
   val tm = modelViewer.engine.transformManager
   return Mat4.of(*tm.getTransform(tm.getInstance(this), null))
}

private fun Int.setTransform(mat: Mat4) {
   val tm = modelViewer.engine.transformManager
   tm.setTransform(tm.getInstance(this), mat.toFloatArray())
}