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mat4_cofactor;

This commit is contained in:
bjorn 2022-05-29 23:48:17 -07:00
parent 082ddc0e1b
commit 7e0e5222da
1 changed files with 24 additions and 0 deletions
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24
src/core/maf.h
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@ -455,6 +455,30 @@ MAF mat4 mat4_invert(mat4 m) {
return m;
}
MAF mat4 mat4_cofactor(mat4 m) {
float m00 = m[0], m04 = m[4], m08 = m[8], m12 = m[12];
float m01 = m[1], m05 = m[5], m09 = m[9], m13 = m[13];
float m02 = m[2], m06 = m[6], m10 = m[10], m14 = m[14];
float m03 = m[3], m07 = m[7], m11 = m[11], m15 = m[15];
m[0] = (m05 * (m10 * m15 - m11 * m14) - m09 * (m06 * m15 - m07 * m14) + m13 * (m06 * m11 - m07 * m10));
m[1] = -(m04 * (m10 * m15 - m11 * m14) - m08 * (m06 * m15 - m07 * m14) + m12 * (m06 * m11 - m07 * m10));
m[2] = (m04 * (m09 * m15 - m11 * m13) - m08 * (m05 * m15 - m07 * m13) + m12 * (m05 * m11 - m07 * m09));
m[3] = -(m04 * (m09 * m14 - m10 * m13) - m08 * (m05 * m14 - m06 * m13) + m12 * (m05 * m10 - m06 * m09));
m[4] = -(m01 * (m10 * m15 - m11 * m14) - m09 * (m02 * m15 - m03 * m14) + m13 * (m02 * m11 - m03 * m10));
m[5] = (m00 * (m10 * m15 - m11 * m14) - m08 * (m02 * m15 - m03 * m14) + m12 * (m02 * m11 - m03 * m10));
m[6] = -(m00 * (m09 * m15 - m11 * m13) - m08 * (m01 * m15 - m03 * m13) + m12 * (m01 * m11 - m03 * m09));
m[7] = (m00 * (m09 * m14 - m10 * m13) - m08 * (m01 * m14 - m02 * m13) + m12 * (m01 * m10 - m02 * m09));
m[8] = (m01 * (m06 * m15 - m07 * m14) - m05 * (m02 * m15 - m03 * m14) + m13 * (m02 * m07 - m03 * m06));
m[9] = -(m00 * (m10 * m15 - m07 * m14) - m04 * (m02 * m15 - m03 * m14) + m12 * (m02 * m07 - m03 * m10));
m[10] = (m00 * (m05 * m15 - m07 * m13) - m04 * (m01 * m15 - m03 * m13) + m12 * (m01 * m07 - m03 * m05));
m[11] = -(m00 * (m05 * m14 - m06 * m13) - m04 * (m01 * m14 - m02 * m13) + m12 * (m01 * m06 - m02 * m05));
m[12] = -(m01 * (m06 * m11 - m07 * m10) - m05 * (m02 * m11 - m03 * m10) + m09 * (m02 * m07 - m03 * m06));
m[13] = (m00 * (m06 * m11 - m07 * m10) - m04 * (m02 * m11 - m03 * m10) + m08 * (m02 * m07 - m03 * m06));
m[14] = -(m00 * (m05 * m11 - m07 * m09) - m04 * (m01 * m11 - m03 * m09) + m08 * (m01 * m07 - m03 * m05));
m[15] = (m00 * (m05 * m10 - m06 * m09) - m04 * (m01 * m10 - m02 * m09) + m08 * (m01 * m06 - m02 * m05));
return m;
}
// Calculate matrix equivalent to "apply n, then m"
MAF mat4 mat4_mul(mat4 m, mat4 n) {
float m00 = m[0], m01 = m[1], m02 = m[2], m03 = m[3],