From 6986e8a00039ccd9ecf3f756673ca23ca507bc87 Mon Sep 17 00:00:00 2001
From: faiface <faiface@ksp.sk>
Date: Mon, 19 Dec 2016 23:50:14 +0100
Subject: [PATCH] heavily optimize AttrType.Size by removing redundant map
---
pixelgl/attr.go | 48 ++++++++++++++++++++++++++++++++----------------
1 file changed, 32 insertions(+), 16 deletions(-)
diff --git a/pixelgl/attr.go b/pixelgl/attr.go
index 7da5e4a..ec45911 100644
--- a/pixelgl/attr.go
+++ b/pixelgl/attr.go
@@ -59,20 +59,36 @@ const (
// Size returns the size of a type in bytes.
func (at AttrType) Size() int {
- return map[AttrType]int{
- Int: 4,
- Float: 4,
- Vec2: 2 * 4,
- Vec3: 3 * 4,
- Vec4: 4 * 4,
- Mat2: 2 * 2 * 4,
- Mat23: 2 * 3 * 4,
- Mat24: 2 * 4 * 4,
- Mat3: 3 * 3 * 4,
- Mat32: 3 * 2 * 4,
- Mat34: 3 * 4 * 4,
- Mat4: 4 * 4 * 4,
- Mat42: 4 * 2 * 4,
- Mat43: 4 * 3 * 4,
- }[at]
+ switch at {
+ case Int:
+ return 4
+ case Float:
+ return 4
+ case Vec2:
+ return 2 * 4
+ case Vec3:
+ return 3 * 4
+ case Vec4:
+ return 4 * 4
+ case Mat2:
+ return 2 * 2 * 4
+ case Mat23:
+ return 2 * 3 * 4
+ case Mat24:
+ return 2 * 4 * 4
+ case Mat3:
+ return 3 * 3 * 4
+ case Mat32:
+ return 3 * 2 * 4
+ case Mat34:
+ return 3 * 4 * 4
+ case Mat4:
+ return 4 * 4 * 4
+ case Mat42:
+ return 4 * 2 * 4
+ case Mat43:
+ return 4 * 3 * 4
+ default:
+ panic("size of vertex attribute type: invalid type")
+ }
}
--
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