TSL: Add bitcast functions and transpiler support #31781
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+106
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Instead of modifying the transpiler, could you create these functions as aliases in I think the GLSL functions have better names and this would also make migration easier since the transpiler is optional. |
📦 Bundle sizeFull ESM build, minified and gzipped.
🌳 Bundle size after tree-shakingMinimal build including a renderer, camera, empty scene, and dependencies.
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Example Code: // ToVar() added for clarity
const instanceIndexBitcastFloat = uintBitsToFloat( float( instanceIndex ) );
const instanceIndexBitcastUint = floatBitsToUint( uint( instanceIndexBitcastFloat ) );
const floatToFloat = bitcast( instanceIndex, 'uint' ).toVar();
// vectors
const vec2Example = uintBitsToFloat( vec2(instanceIndex));
const vec2NativeBitcast = bitcast(instanceIndex, 'vec2')
// Note how with GLSL alias functions, inputType of original GLSL function is enforced
nodeVar0 = bitcast<f32>( u32( f32( instanceIndex ) ) );
nodeVar1 = bitcast<u32>( f32( u32( nodeVar0 ) ) );
// Whereas WGSL implementation is more freeform
nodeVar3 = bitcast<u32>( instanceIndex );
// vectors
nodeVar4 = bitcast<vec2<f32>>(vec2<u32>(instanceIndex, instanceIndex));
// regular bitcast will just translate what is given to it
nodeVar5 = bitcast<vec2<f32>>(instanceIndex);
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sunag
reviewed
Aug 31, 2025
sunag
reviewed
Sep 2, 2025
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Related issue: #31735
Description
Adds specialized blocks for translating bitcast functionality.