From bb0a0f485e5937df16b3d21c6ac97ea5719367eb Mon Sep 17 00:00:00 2001
From: Alexandru-Paul Copil <alexandru@cpl.li>
Date: Fri, 9 Jul 2021 10:44:48 +0300
Subject: [PATCH] Optimize *GLShader.Update() by allocating array before for
 loop

---
 pixelgl/glshader.go | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/pixelgl/glshader.go b/pixelgl/glshader.go
index 3d10aa0..c76c9a3 100644
--- a/pixelgl/glshader.go
+++ b/pixelgl/glshader.go
@@ -68,13 +68,14 @@ func NewGLShader(fragmentShader string) *GLShader {
 
 // Update reinitialize GLShader data and recompile the underlying gl shader object
 func (gs *GLShader) Update() {
-	gs.uf = nil
-	for _, u := range gs.uniforms {
-		gs.uf = append(gs.uf, glhf.Attr{
-			Name: u.Name,
-			Type: u.Type,
-		})
+	gs.uf = make([]glhf.Attr, len(gs.uniforms))
+	for idx := range gs.uniforms {
+		gs.uf[idx] = glhf.Attr{
+			Name: gs.uniforms[idx].Name,
+			Type: gs.uniforms[idx].Type,
+		}
 	}
+
 	var shader *glhf.Shader
 	mainthread.Call(func() {
 		var err error