X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=util.h;h=498e5f23ed443e0e56ce7ed98af9e17371714008;hp=a6ca0e8dc080185094e5fd01efa3908002c36e7e;hb=758f632c42befae7f2b7af137554429fa544d4cb;hpb=a592c55caca0fb654bad4ec43b84c46abcee21c2

diff --git a/util.h b/util.h
index a6ca0e8..498e5f2 100644
--- a/util.h
+++ b/util.h
@@ -11,13 +11,19 @@
 // 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()
 #else
-#define check_error() { int err = glGetError(); if (err != GL_NO_ERROR) { printf("GL error 0x%x at line %d\n", err, __LINE__); exit(1); } }
+#define check_error() { int err = glGetError(); if (err != GL_NO_ERROR) { printf("GL error 0x%x at %s:%d\n", err, __FILE__, __LINE__); exit(1); } }
 #endif
 
 #endif // !defined(_UTIL_H)