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-rw-r--r--js/ui/controls.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/js/ui/controls.js b/js/ui/controls.js
index 485046e..9fd6dc5 100644
--- a/js/ui/controls.js
+++ b/js/ui/controls.js
@@ -147,7 +147,7 @@ var controls = (function(){
}
})
controls.shader = new ShaderTool (shader_el)
- shader_textarea.value = demo_shader.innerHTML
+ shader_textarea.value = shader_textarea.value || demo_shader.innerHTML
shader_textarea.addEventListener("input", function(){
var fn = shader.build(shader_textarea.value)
fn && shader.run(canvas)