1 files changed, 9 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/common/gpu_shader_common_math_utils.glsl b/source/blender/gpu/shaders/common/gpu_shader_common_math_utils.glsl
index a28705f158d..1ba22b4c5da 100644
--- a/source/blender/gpu/shaders/common/gpu_shader_common_math_utils.glsl
+++ b/source/blender/gpu/shaders/common/gpu_shader_common_math_utils.glsl
@@ -134,6 +134,15 @@ vec3 fallback_pow(vec3 a, float b, vec3 fallback)
 
 /* Matirx Math */
 
+/* Return a 2D rotation matrix with the angle that the input 2D vector makes with the x axis. */
+mat2 vector_to_rotation_matrix(vec2 vector)
+{
+  vec2 normalized_vector = normalize(vector);
+  float cos_angle = normalized_vector.x;
+  float sin_angle = normalized_vector.y;
+  return mat2(cos_angle, sin_angle, -sin_angle, cos_angle);
+}
+
 mat3 euler_to_mat3(vec3 euler)
 {
   float cx = cos(euler.x);