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math: Add Matrix multiplication tests (#1066)

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Co-authored-by: Stephen Gutekanst <stephen@hexops.com>
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Joel 2023-10-17 04:32:20 +02:00 • committed by GitHub
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commit fde4f820d7
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src/math/mat.zig
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@ -340,7 +340,6 @@ pub fn Mat(
};
/// Matrix multiplication a*b
// TODO: needs tests
pub inline fn mul(a: *const Matrix, b: *const Matrix) Matrix {
@setEvalBranchQuota(10000);
var result: Matrix = undefined;
@ -686,3 +685,48 @@ test "Mat4x4_mulVec_vec4" {
const expected = math.vec4(4, 47, 5, 68);
try testing.expect(math.Vec4, expected).eql(m);
}
test "Mat3x3_mul" {
const a = math.Mat3x3.init(
&math.vec3(4, 2, -3),
&math.vec3(7, 9, -8),
&math.vec3(-1, 8, -8),
);
const b = math.Mat3x3.init(
&math.vec3(5, -7, -8),
&math.vec3(6, -3, 2),
&math.vec3(-3, -4, 4),
);
const c = math.Mat3x3.mul(&a, &b);
const expected = math.Mat3x3.init(
&math.vec3(41, -22, -40),
&math.vec3(113, -44, -70),
&math.vec3(67, 15, -8),
);
try testing.expect(math.Mat3x3, expected).eql(c);
}
test "Mat4x4_mul" {
const a = math.Mat4x4.init(
&math.vec4(10, -5, 6, -2),
&math.vec4(0, -1, 0, 9),
&math.vec4(-1, 6, -4, 8),
&math.vec4(9, -8, -6, -10),
);
const b = math.Mat4x4.init(
&math.vec4(7, -7, -3, -8),
&math.vec4(1, -1, -7, -2),
&math.vec4(-10, 2, 2, -2),
&math.vec4(10, -7, 7, 1),
);
const c = math.Mat4x4.mul(&a, &b);
const expected = math.Mat4x4.init(
&math.vec4(-15, -39, 3, -84),
&math.vec4(89, -62, 70, 11),
&math.vec4(119, -63, 9, 12),
&math.vec4(15, 3, -53, -54),
);
try testing.expect(math.Mat4x4, expected).eql(c);
}