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mat4_transform_project in maf.h 

mat4_transform ignores the final row of the matrix, which normally contains scale data. This is fine for modelview matrices, which is all lovr currently uses mat4_transform for. However it fails if you ever use mat4_transform on a projection matrix.

mat4_transform_project takes the final row into account, so you can use it with projection matrices. This was useful in my fork and might be useful to have around in lovr someday later.
This commit is contained in:
mcc 2019-06-28 22:27:16 -04:00 committed by Bjorn
parent 1b085a00ea
commit 53270fbd76
1 changed files with 11 additions and 0 deletions
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11
src/core/maf.h
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@ -675,6 +675,17 @@ MAF void mat4_transform(mat4 m, vec3 v) {
);
}
MAF void mat4_transform_project(mat4 m, vec3 v) {
vec3_set(v,
v[0] * m[0] + v[1] * m[4] + v[2] * m[8] + m[12],
v[0] * m[1] + v[1] * m[5] + v[2] * m[9] + m[13],
v[0] * m[2] + v[1] * m[6] + v[2] * m[10] + m[14]
);
float w =
v[0] * m[3] + v[1] * m[7] + v[2] * m[11] + m[15];
vec3_set(v, v[0]/w, v[1]/w, v[2]/w);
}
MAF void mat4_transformDirection(mat4 m, vec3 v) {
vec3_set(v,
v[0] * m[0] + v[1] * m[4] + v[2] * m[8],