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Correct inverse and inverse_transpose for 2x2 matrices

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gingerBill
2022-01-20 13:18:37 +00:00
parent 1b23dd2257
commit cfbc1a447b
1 changed files with 12 additions and 12 deletions
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core/runtime/core_builtin_matrix.odin
+12 -12
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@@ -146,14 +146,14 @@ matrix2x2_inverse_transpose :: proc "contextless" (x: $M/matrix[2, 2]$T) -> (y:
d := x[0, 0]*x[1, 1] - x[0, 1]*x[1, 0] d := x[0, 0]*x[1, 1] - x[0, 1]*x[1, 0]
when intrinsics.type_is_integer(T) { when intrinsics.type_is_integer(T) {
y[0, 0] = +x[1, 1] / d y[0, 0] = +x[1, 1] / d
y[1, 0] = -x[1, 0] / d y[1, 0] = -x[0, 1] / d
y[0, 1] = -x[0, 1] / d y[0, 1] = -x[1, 0] / d
y[1, 1] = +x[0, 0] / d y[1, 1] = +x[0, 0] / d
} else { } else {
id := 1 / d id := 1 / d
y[0, 0] = +x[1, 1] * id y[0, 0] = +x[1, 1] * id
y[1, 0] = -x[1, 0] * id y[1, 0] = -x[0, 1] * id
y[0, 1] = -x[0, 1] * id y[0, 1] = -x[1, 0] * id
y[1, 1] = +x[0, 0] * id y[1, 1] = +x[0, 0] * id
} }
return return
@@ -214,16 +214,16 @@ matrix1x1_inverse :: proc "contextless" (x: $M/matrix[1, 1]$T) -> (y: M) {
matrix2x2_inverse :: proc "contextless" (x: $M/matrix[2, 2]$T) -> (y: M) { matrix2x2_inverse :: proc "contextless" (x: $M/matrix[2, 2]$T) -> (y: M) {
d := x[0, 0]*x[1, 1] - x[0, 1]*x[1, 0] d := x[0, 0]*x[1, 1] - x[0, 1]*x[1, 0]
when intrinsics.type_is_integer(T) { when intrinsics.type_is_integer(T) {
y[0, 0] = x[1, 1] / d y[0, 0] = +x[1, 1] / d
y[0, 1] = x[1, 0] / d y[0, 1] = -x[0, 1] / d
y[1, 0] = x[0, 1] / d y[1, 0] = -x[1, 0] / d
y[1, 1] = x[0, 0] / d y[1, 1] = +x[0, 0] / d
} else { } else {
id := 1 / d id := 1 / d
y[0, 0] = x[1, 1] * id y[0, 0] = +x[1, 1] * id
y[0, 1] = x[1, 0] * id y[0, 1] = -x[0, 1] * id
y[1, 0] = x[0, 1] * id y[1, 0] = -x[1, 0] * id
y[1, 1] = x[0, 0] * id y[1, 1] = +x[0, 0] * id
} }
return return
} }