Matrices and vectors, to make coding next commit more pleasant

1 files changed, 23 insertions, 0 deletions

diff --git a/includes/misc.h b/includes/misc.h
index 4094b39..a929f8c 100644
--- a/includes/misc.h
+++ b/includes/misc.h
@@ -71,4 +71,27 @@ void *file_load(char *fn, int *size);
 
 int cpu_check(void);
 
+// a b
+// c d
+struct matrix2d {float a,b,c,d;};
+typedef struct matrix2d matrix2d;
+
+// column vector
+struct vector2d {float x,y;};
+typedef struct vector2d vector2d;
+
+matrix2d m2d_multiply_m2d(matrix2d m1, matrix2d m2);
+vector2d m2d_multiply_v2d(matrix2d m, vector2d v);
+matrix2d m2d_multiply_float(matrix2d m, float s);
+vector2d v2d_multiply_float(vector2d v, float s);
+
+vector2d v2d_add(vector2d v1, vector2d v2);
+vector2d v2d_sub(vector2d v1, vector2d v2);
+
+matrix2d m2d_new(float me0, float me1, float me2, float me3);
+vector2d v2d_new(float x, float y);
+
+extern vector2d v2d_zero;
+extern matrix2d m2d_identity;
+
 #endif