Open Duckonaut opened 11 months ago
When compiling a GLSL shader to WGSL, if the shader is using the modf function, the error unhandled GLSL.std.450 instruction 35 is thrown.
modf
unhandled GLSL.std.450 instruction 35
As far as I understand, this is because the modf in GLSL gets compiled to the SPIR-V instruction Modf, (which apparently is deprecated? https://registry.khronos.org/SPIR-V/specs/unified1/GLSL.std.450.html) and is an instruction that returns a single value, while the modf in WGSL returns the fractional and whole parts (https://www.w3.org/TR/WGSL/#modf-builtin) which I would assume is the ModfStruct instruction in SPIR-V.
I don't know if this is on sokol-shdc to handle, or an odd incompatibility with the SPIR-V tools, because I'd imagine it isn't impossible to just use that struct-returning function on wgsl and add a .fract .
.fract
Attached is the shader that causes trouble.
modf.txt
When compiling a GLSL shader to WGSL, if the shader is using the
modffunction, the errorunhandled GLSL.std.450 instruction 35is thrown.As far as I understand, this is because the
modfin GLSL gets compiled to the SPIR-V instruction Modf, (which apparently is deprecated? https://registry.khronos.org/SPIR-V/specs/unified1/GLSL.std.450.html) and is an instruction that returns a single value, while themodfin WGSL returns the fractional and whole parts (https://www.w3.org/TR/WGSL/#modf-builtin) which I would assume is the ModfStruct instruction in SPIR-V.I don't know if this is on sokol-shdc to handle, or an odd incompatibility with the SPIR-V tools, because I'd imagine it isn't impossible to just use that struct-returning function on wgsl and add a
.fract.Attached is the shader that causes trouble.
modf.txt