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Allow swizzle to accept 0 or 1 #72

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Merged
kooparse merged 4 commits into from
Nov 18, 2025
Merged

Allow swizzle to accept 0 or 1 #72

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8d4d3fc
Improve swizzle function for vector components
SlashScreen Nov 10, 2025
2da5f56
Document 'swizzle' operation in README
SlashScreen Nov 10, 2025
315e23c
Fix typo in swizzle function comment
SlashScreen Nov 14, 2025
28ae768
Merge branch 'main' into swizzle_0
kooparse Nov 18, 2025
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -94,6 +94,7 @@ pub fn main () void {
| div | Construct new vector resulting from the division between two vectors |
| mul | Construct new vector resulting from the multiplication between two vectors |
| scale | Construct new vector after multiplying each components by a given scalar |
| swizzle | Comptime vector component swizzle. Accepts component names, 0, or 1 |
| cross | Construct the cross product (as vector) from two vectors (only for vec3) |
| dot | Return the dot product between two vectors |
| lerp | Linear interpolation between two vectors |
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14 changes: 12 additions & 2 deletions src/generic_vector.zig
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Expand Up @@ -402,14 +402,24 @@ pub fn GenericVector(comptime dimensions: comptime_int, comptime T: type) type {
pub const rotate = DimensionImpl.rotate;
pub const cross = DimensionImpl.cross;

/// Comptime vector component swizzle. Accepts component names, 0, or 1.
pub fn swizzle(self: Self, comptime comps: []const u8) SwizzleType(comps.len) {
// Someone doing a single component swizzle with 0 or 1 is weird but... it's supported...
if (comps.len == 1) {
return self.data[@intFromEnum(@field(Component, &.{comps[0]}))];
return switch (comps[0]) {
'0' => 0,
'1' => 1,
else => self.data[@intFromEnum(@field(Component, &.{comps[0]}))],
};
}

var result = GenericVector(comps.len, T).zero();
inline for (comps, 0..) |comp, i| {
result.data[i] = self.data[@intFromEnum(@field(Component, &.{comp}))];
switch (comp) {
'0' => result.data[i] = 0,
'1' => result.data[i] = 1,
else => result.data[i] = self.data[@intFromEnum(@field(Component, &.{comp}))],
}
}
return result;
}
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