add rotating cheese

This adds the Cheese3D graphics api and makes the cheese command display a cheese rotating in 3d as a demo

1 files changed, 17 insertions, 0 deletions

diff --git a/stage3/math.h b/stage3/math.h
index 6f7ae58..b067409 100644
--- a/stage3/math.h
+++ b/stage3/math.h
@@ -18,6 +18,23 @@ static inline double sin(double x)
 	return x;
 }
 
+static inline double cos(double x)
+{
+	asm("fldl %1; fcos; fstpl %0":"=m"(x):"m"(x));
+	return x;
+}
+
+static inline double tan(double x)
+{
+	asm("fldl %1; fptan; fstpl %0; fstpl %0":"=m"(x):"m"(x));
+	return x;
+}
+
+static inline void sincos(double x, double *sin, double *cos)
+{
+	asm("fldl %2; fsincos; fstpl %0; fstpl %1":"=m"(*sin),"=m"(*cos):"m"(x));
+}
+
 static inline double rad(double x)
 {
 	return PI / 180.0 * x;