CROSS(3clc)

💖 CROSS(3clc) — the OpenCL manual, but make it bestie 💖

okay so this is a page from the OpenCL Manual, and today's main character is cross 🧚✨ no cap.

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✨ NAME ✨

cross — the cross product, babe. literally.

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🦋 SYNOPSIS 🦋

here's the whole squad of overloads, verbatim, don't @ me:

float4 cross(float4 p0, float4 p1);

float3 cross(float3 p0, float3 p1);

double4 cross(double4 p0, double4 p1);

double3 cross(double3 p0, double3 p1);

half4 cross (half4 p0, half4 p1)   //
if half extension enabled
half3 cross (half3 p0, half3 p1)   //
if half extension enabled

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🌸 DESCRIPTION 🌸

so like, it returns the cross product of p0.xyz and p1.xyz. that's the vibe. 🫶

and the w component of the float4 result — or double, if the cl_khr_fp16(3clc) extension is enabled — will be 0.0. yes, zero. periodt. 💅

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👑 NOTES 👑

okay listen up bestie, this part is lowkey important:

• Built-in geometric functions operate component-wise. The description is per-component. 🧠
• floatn is float, float2, float3, or float4, and doublen is double, double2, double3, or double4.
• The built-in geometric functions are implemented using the round to nearest even rounding mode. iconic behaviour honestly.
• The geometric functions can be implemented using contractions such as mad(3clc) or fma(3clc). 🔥
• An application that wants to use half and halfn types will need to include the #pragma OPENCL EXTENSION cl_khr_fp16(3clc) : enable directive.

not me reminding you again that half needs that pragma. iykyk. 🙈

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⭐ SPECIFICATION ⭐

OpenCL Specification[1] 📚

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🎀 SEE ALSO 🎀

geometricFunctions(3clc) — go read that one too, it's giving family reunion. 💜

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🌈 AUTHORS 🌈

The Khronos Group 👑

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💖 COPYRIGHT 💖

Copyright © 2007-2011 The Khronos Group Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated documentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to the condition that this copyright notice and permission notice shall be included in all copies or substantial portions of the Materials.

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💀 NOTES 💀

(again, but numbered this time, don't shoot the messenger)

1. OpenCL Specification page 262, section 6.12.5 - Geometric Functions

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and that's the whole page, bestie!! 🦋 this lil doc came from The Khronos Group and it's dated 01/14/2021 — shoutout to CROSS(3clc) for being exactly what it says on the tin. slay, stay cross-producting, mwah 💅💖✨