Fix: GPU: from_up_axis

glsl sign can return 0. Fixes surfels display when normal.z == 0.
2023-12-13 17:46:55 +01:00 · 2023-12-13 17:46:55 +01:00 · 6c40adcc36
commit 6c40adcc36
parent f7383cfe9b
1 changed files with 1 additions and 1 deletions
--- a/source/blender/gpu/shaders/common/gpu_shader_math_matrix_lib.glsl
+++ b/source/blender/gpu/shaders/common/gpu_shader_math_matrix_lib.glsl
@ -1029,7 +1029,7 @@ mat4x4 from_loc_rot_scale(vec3 location, AxisAngle rotation, vec3 scale)
 mat3x3 from_up_axis(vec3 up)
 {
  /* Duff, Tom, et al. "Building an orthonormal basis, revisited." JCGT 6.1 (2017). */
-  float z_sign = sign(up.z);
+  float z_sign = up.z >= 0.0 ? 1.0 : -1.0;
  float a = -1.0 / (z_sign + up.z);
  float b = up.x * up.y * a;