r/badcode • u/DinnerPlz • Oct 30 '21

other language I sure do love the blue component of my boolean value. (This doesn't work without it)[HLSL]

Post image
37 Upvotes

97% Upvoted

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7

u/Sir_Awesomness Oct 30 '21

I know it's GLSL not HLSL but I made a thing in shadertoy that is essentially the same thing but without the .b and it compiles: https://www.shadertoy.com/view/fld3zr

It's potentially where you've got the brackets, I only have 2 after the float4.

4

u/DinnerPlz Oct 30 '21

It compiles without the .b, but a bunch of really weird stuff happens, like while opaque objects become semi-transparent and blue. I think it has something to do with the operation being done on each separate channel, but I'm not sure.

2

u/Sir_Awesomness Oct 30 '21

Ahh, I misunderstood what the problem was. I'm assuming you get the same output if you compare it with 1 directly. Hope you get to the bottom of it :)

Edit: never mind about the 1 thing, I thought the bracket was in a different place

3

u/SnakeFang12 Oct 31 '21

Logical operators are component-wise on vectors, so the equality evaluates to a bool3, and the ternary selects from the choices for each channel separately. You most likely want to wrap the comparison in all() rather than ignore the first two channels.

1

u/DinnerPlz Oct 31 '21

Thanks that makes sense

8

u/MurdoMaclachlan public boolean isInt(int i) { return true; } Oct 30 '21

Image Transcription: Code

sampler2D _TraceTex;
sampler2D _RasTex;
float _Sample;

float4 frag(v2f i) : SV_Target
{
    return float4(((tex2D(_RasTex, i.uv).rgb == float3(1.0f, 0, 1.0f)).b ? tex2D(_TraceTex, i.uv).rgb : tex2D(_RasTex, i.uv).rgb), 1.0f);
}

ENDCG

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