Description

The GLSL to TSL transpiler turns multiplications with negative numbers into subtractions if they are not surrounded by parenthesis.

The GLSL code

float correct = 1.0 * (-1.0);
float wrong = 1.0 * -1.0;

is transpiled to the obviously wrong result:

// Three.js Transpiler r177

import { float, mul } from 'three/tsl';

const correct = float( mul( 1.0, float( - 1.0 ) ) ).toVar();
const wrong = float( 1.0 - 1.0 ).toVar();

The same issue occurs for vector (and matrix?) data types when they are multiplied by a negative number.

Reproduction steps

1. Copy the above example into the TSL transpiler.

Code

GLSL code that gives wrong transpilation result:

float correct = 1.0 * (-1.0);
float wrong = 1.0 * -1.0;

Live example

TSL transpiler (copy the code from above).

Screenshots

No response

Version

r177

Device

Desktop

Browser

Firefox

OS

MacOS