X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=util.h;h=498e5f23ed443e0e56ce7ed98af9e17371714008;hb=758f632c42befae7f2b7af137554429fa544d4cb;hp=ab0ee5d74fe2d26f4f1d8375d7975f8ccfede3c9;hpb=8bbe79ea2da2bc02c59aaf0d697cff24ddcba73a;p=movit

diff --git a/util.h b/util.h
index ab0ee5d..498e5f2 100644
--- a/util.h
+++ b/util.h
@@ -11,8 +11,14 @@
 // assumes h in [0, 2pi> or [-pi, pi>
 void hsv2rgb(float h, float s, float v, float *r, float *g, float *b);
 
+// Column major (same as OpenGL).
+typedef double Matrix3x3[9];
+
 std::string read_file(const std::string &filename);
 GLhandleARB compile_shader(const std::string &shader_src, GLenum type);
+void multiply_3x3_matrices(const Matrix3x3 a, const Matrix3x3 b, Matrix3x3 result);
+void invert_3x3_matrix(const Matrix3x3 m, Matrix3x3 result);
+void print_3x3_matrix(const Matrix3x3 m);
 
 #ifdef NDEBUG
 #define check_error()