duplicate output from TSL

[trusktr]

Description

Migrated from the forum.

Looks like TSL can output duplicate statements in some case(s).

Reproduction steps

• open the linked fiddle
• uncomment either of the .debug lines
• run the fiddle

Code

I wrote this TSL,

If(diffuseColor.a.mul(alphaFactor).lessThanEqual(0.1337), () => Discard())

and I noticed the output has duplicate discard statements:

	if ( ( ( DiffuseColor.w * nodeVar1 ) <= 0.1337 ) ) {

		discard;
		discard;
		

	}

However if I write this TSL,

diffuseColor.a.mul(alphaFactor).lessThanEqual(0.1337).discard()

then the output is fine:

	if ( ( ( DiffuseColor.w * nodeVar1 ) <= 0.1337 ) ) {

		discard;
		

	}

This example happens to be harmless. Might be worth checking to ensure other less-harmless statements are not duplicated (if they were, maybe someone would have errors already).

Live example

• r182 WebGPURenderer

Screenshots

No response

Version

r182

Device

No response

Browser

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OS

No response

[DennisSmolek]

Note: Discard(conditional) Takes the conditional value as an argument so:

  Discard(diffuseColor.a.mul(alphaFactor).lessThanEqual(0.1337));

is producing the expected results.

Doesn't solve the double execution though.

Its something with the if/discard because I tried with () => float(2) and only got a single return 2.0 response.