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Merge pull request #18 from jimon/fix_mat4_inverse_for_good 

Fixing mat4 inverse again
This commit is contained in:
gingerBill 2016-12-18 17:03:09 +00:00 committed by GitHub
parent 84afc68e05 e8bc38cec5
commit 216ae88426
2 changed files with 5 additions and 12 deletions
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2
README.md
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@ -5,7 +5,7 @@ gb single-file public domain libraries for C & C++
library | latest version | category | description
----------------|----------------|----------|-------------
**gb.h** | 0.26d | misc | Helper library (Standard library _improvement_)
**gb_math.h** | 0.07c | math | Vector math library geared towards game development
**gb_math.h** | 0.07d | math | Vector math library geared towards game development
**gb_gl.h** | 0.05 | graphics | OpenGL Helper Library
**gb_string.h** | 0.95a | strings | A better string library (this is built into gb.h too with custom allocator support!)
**gb_ini.h** | 0.93 | misc | Simple ini file loader library

15
gb_math.h
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@ -3,6 +3,7 @@
use '#define GB_MATH_IMPLEMENTATION' before including to create the implementation in _ONE_ file
Version History:
0.07d - Fix mat4_inverse
0.07c - Add gb_random01
0.07b - Fix mat4_inverse
0.07a - Fix Mat2
@ -1565,9 +1566,9 @@ void gb_mat4_inverse(gbMat4 *out, gbMat4 *in) {
o[3][3] = +(m[0][0] * sf15 - m[0][1] * sf17 + m[0][2] * sf18);
ood = 1.0f / (m[0][0] * o[0][0] +
m[1][0] * o[1][0] +
m[2][0] * o[2][0] +
m[3][0] * o[3][0]);
m[0][1] * o[1][0] +
m[0][2] * o[2][0] +
m[0][3] * o[3][0]);
o[0][0] *= ood;
o[0][1] *= ood;
@ -1585,14 +1586,6 @@ void gb_mat4_inverse(gbMat4 *out, gbMat4 *in) {
o[3][1] *= ood;
o[3][2] *= ood;
o[3][3] *= ood;
/* Transpose */
tmp = o[1][0]; o[1][0] = o[0][1]; o[0][1] = tmp;
tmp = o[2][0]; o[2][0] = o[0][2]; o[0][2] = tmp;
tmp = o[3][0]; o[3][0] = o[0][3]; o[0][3] = tmp;
tmp = o[2][1]; o[2][1] = o[1][2]; o[1][2] = tmp;
tmp = o[3][1]; o[3][1] = o[1][3]; o[1][3] = tmp;
tmp = o[3][2]; o[3][2] = o[2][3]; o[2][3] = tmp;
}