excaliburjs / Excalibur / 31910541623

89%

push

github

feat: glsl tagged template literal (#3821)

This PR adds a new `glsl` tagged template literal that helps with some common paper cuts when authoring custom shaders

1. Detect and automatically premultiply alpha, can opt out with the pragma `#pragma excalibur premultiply(off)`
   a. injects `ex_premultiply` and `ex_unpremultiply` if you want to do it by hand
   b. injects `pixel_texture(sampler2D, vec2)` to sample pixel art nicely using the same internals as excalibur
3. It'll automatically tag the magic `#version 300 es` if it's not present
4. Automatically sets `precision mediump float;` which is probably what you want by default,

7147 of 9346 branches covered (76.47%)

43 of 44 new or added lines in 1 file covered. (97.73%)

15762 of 17703 relevant lines covered (89.04%)

25317.74 hits per line