Modifiers: Add option to directly specify a 2D transform for UVWarp

Currently the only option is to warp based on the transform of other
objects, which is inconvenient if you want to e.g. control it through
a driver - you need to set up a dummy object and go through that,
which is clunky and should be unneccessary.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D6690

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/blenlib/intern/math_matrix.c b/source/blender/blenlib/intern/math_matrix.c
index 4d8a2f72eca..86a08a42247 100644
--- a/source/blender/blenlib/intern/math_matrix.c
+++ b/source/blender/blenlib/intern/math_matrix.c
@@ -210,6 +210,16 @@ void swap_m4m4(float m1[4][4], float m2[4][4])
   }
 }
 
+void shuffle_m4(float R[4][4], int index[4])
+{
+  zero_m4(R);
+  for (int k = 0; k < 4; k++) {
+    if (index[k] >= 0) {
+      R[index[k]][k] = 1.0f;
+    }
+  }
+}
+
 /******************************** Arithmetic *********************************/
 
 void mul_m4_m4m4(float R[4][4], const float A[4][4], const float B[4][4])