Daniel Borges msklywenn

Writing to Compressed Textures

In general it's not possible to use a block-compressed texture as a render target or as a compute shader output. Instead you have to either: Alias the block compressed texture with an uncompressed texture where each texel corresponds to a block, or to output the compressed blocks to an uncompressed texture buffer, and then copy the compressed blocks from that intermediate memory location to the final compressed texture.

Each of the graphics APIs expose this functionality in a different way. This document explains the options available under the following APIs:

Direct3D
Vulkan
Metal
OpenGL

How to setup a practically free CDN using Backblaze B2 and Cloudflare

⚠️ Note 2023-01-21
Some things have changed since I originally wrote this in 2016. I have updated a few minor details, and the advice is still broadly the same, but there are some new Cloudflare features you can (and should) take advantage of. In particular, pay attention to Trevor Stevens' comment here from 22 January 2022, and Matt Stenson's useful caching advice. In addition, Backblaze, with whom Cloudflare are a Bandwidth Alliance partner, have published their own guide detailing how to use Cloudflare's Web Workers to cache content from B2 private buckets. That is worth reading,

	// The following code is licensed under the MIT license: https://gist.github.com/TheRealMJP/bc503b0b87b643d3505d41eab8b332ae

	// Samples a texture with Catmull-Rom filtering, using 9 texture fetches instead of 16.
	// See http://vec3.ca/bicubic-filtering-in-fewer-taps/ for more details
	float4 SampleTextureCatmullRom(in Texture2D<float4> tex, in SamplerState linearSampler, in float2 uv, in float2 texSize)
	{
	// We're going to sample a a 4x4 grid of texels surrounding the target UV coordinate. We'll do this by rounding
	// down the sample location to get the exact center of our "starting" texel. The starting texel will be at
	// location [1, 1] in the grid, where [0, 0] is the top left corner.
	float2 samplePos = uv * texSize;

	#!/bin/bash
	#
	# Configuration
	# -------------
	# [smartctl_hddtemp_*]
	# user root
	# group root
	# env.attribute 194 # Id of SMART attribute, you probably want to use 194. http://en.wikipedia.org/wiki/S.M.A.R.T.#Known_ATA_S.M.A.R.T._attributes
	# env.warning 50 # The environment variables "warning" and "critical" sets the temperature from which Munin starts to warn.
	# env.critical 55