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Optimized inverse

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This commit is contained in:
Christophe Riccio 2010-11-27 13:24:28 +00:00
parent 81456e8b62
commit 4409032a9d
2 changed files with 34 additions and 2 deletions
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13
glm/core/type_mat3x3.inl
View File

@ -377,7 +377,7 @@ namespace detail
T S20 = value[2][0];
T S21 = value[2][1];
T S22 = value[2][2];
/*
tmat3x3<T> Inverse(
+ (S11 * S22 - S21 * S12),
- (S10 * S22 - S20 * S12),
@ -388,6 +388,17 @@ namespace detail
+ (S01 * S12 - S11 * S02),
- (S00 * S12 - S10 * S02),
+ (S00 * S11 - S10 * S01));
*/
tmat3x3<T> Inverse(
S11 * S22 - S21 * S12,
S12 * S20 - S22 * S10,
S10 * S21 - S20 * S11,
S02 * S21 - S01 * S22,
S00 * S22 - S02 * S20,
S01 * S20 - S00 * S21,
S12 * S01 - S11 * S02,
S10 * S02 - S12 * S00,
S11 * S00 - S10 * S01);
T Determinant = S00 * (S11 * S22 - S21 * S12)
- S10 * (S01 * S22 - S21 * S02)

23
glm/core/type_mat4x4.inl
View File

@ -413,7 +413,7 @@ namespace detail
value_type SubFactor16 = this->value[1][0] * this->value[2][3] - this->value[2][0] * this->value[1][3];
value_type SubFactor17 = this->value[1][0] * this->value[2][2] - this->value[2][0] * this->value[1][2];
value_type SubFactor18 = this->value[1][0] * this->value[2][1] - this->value[2][0] * this->value[1][1];
/*
tmat4x4<T> Inverse(
+ (this->value[1][1] * SubFactor00 - this->value[1][2] * SubFactor01 + this->value[1][3] * SubFactor02),
- (this->value[1][0] * SubFactor00 - this->value[1][2] * SubFactor03 + this->value[1][3] * SubFactor04),
@ -434,6 +434,27 @@ namespace detail
+ (this->value[0][0] * SubFactor13 - this->value[0][2] * SubFactor16 + this->value[0][3] * SubFactor17),
- (this->value[0][0] * SubFactor14 - this->value[0][1] * SubFactor16 + this->value[0][3] * SubFactor18),
+ (this->value[0][0] * SubFactor15 - this->value[0][1] * SubFactor17 + this->value[0][2] * SubFactor18));
*/
tmat4x4<T> Inverse(
+ this->value[1][1] * SubFactor00 - this->value[1][2] * SubFactor01 + this->value[1][3] * SubFactor02,
- this->value[1][0] * SubFactor00 + this->value[1][2] * SubFactor03 - this->value[1][3] * SubFactor04,
+ this->value[1][0] * SubFactor01 - this->value[1][1] * SubFactor03 + this->value[1][3] * SubFactor05,
- this->value[1][0] * SubFactor02 + this->value[1][1] * SubFactor04 - this->value[1][2] * SubFactor05,
- this->value[0][1] * SubFactor00 + this->value[0][2] * SubFactor01 - this->value[0][3] * SubFactor02,
+ this->value[0][0] * SubFactor00 - this->value[0][2] * SubFactor03 + this->value[0][3] * SubFactor04,
- this->value[0][0] * SubFactor01 + this->value[0][1] * SubFactor03 - this->value[0][3] * SubFactor05,
+ this->value[0][0] * SubFactor02 - this->value[0][1] * SubFactor04 + this->value[0][2] * SubFactor05,
+ this->value[0][1] * SubFactor06 - this->value[0][2] * SubFactor07 + this->value[0][3] * SubFactor08,
- this->value[0][0] * SubFactor06 + this->value[0][2] * SubFactor09 - this->value[0][3] * SubFactor10,
+ this->value[0][0] * SubFactor11 - this->value[0][1] * SubFactor09 + this->value[0][3] * SubFactor12,
- this->value[0][0] * SubFactor08 + this->value[0][1] * SubFactor10 - this->value[0][2] * SubFactor12,
- this->value[0][1] * SubFactor13 + this->value[0][2] * SubFactor14 - this->value[0][3] * SubFactor15,
+ this->value[0][0] * SubFactor13 - this->value[0][2] * SubFactor16 + this->value[0][3] * SubFactor17,
- this->value[0][0] * SubFactor14 + this->value[0][1] * SubFactor16 - this->value[0][3] * SubFactor18,
+ this->value[0][0] * SubFactor15 - this->value[0][1] * SubFactor17 + this->value[0][2] * SubFactor18);
value_type Determinant =
+ this->value[0][0] * Inverse[0][0]