Add Ceil{,32} and Floor{,32}.

math.go

@@ -2,6 +2,10 @@ package geom
 
 import "math"
 
+func emulate32(f float32, fn func(float64) float64) float32 {
+	return float32(fn(float64(f)))
+}
+
 // Abs returns the absolute value.
 func Abs(f float64) float64 {
 	return math.Abs(f)
@@ -22,6 +26,14 @@ func Atan32(f float32) float32 {
 	return float32(math.Atan(float64(f)))
 }
 
+// Ceil rounds f up to an natural number.
+func Ceil(f float64) float64 {
+	return math.Ceil(f)
+}
+
+// Ceil32 rounds f up to an natural number.
+func Ceil32(f float32) float32 { return emulate32(f, math.Ceil) }
+
 // Cos returns the cosine of f.
 func Cos(f float64) float64 {
 	return math.Cos(f)
@@ -32,6 +44,14 @@ func Cos32(f float32) float32 {
 	return float32(math.Cos(float64(f)))
 }
 
+// Floor rounds f down to an natural number.
+func Floor(f float64) float64 {
+	return math.Floor(f)
+}
+
+// Floor32 rounds f down to an natural number.
+func Floor32(f float32) float32 { return emulate32(f, math.Floor) }
+
 // IsNaN checks if the floating point number is not a number.
 func IsNaN(f float64) bool {
 	return f != f