layer_get_shader

描述

This function can be used to check if the given layer has a shader assigned to it. You supply the layer ID (which you get when you create the layer using layer_create()) or the layer name (as a string - this will have a performance impact), and the function will return either the shader index of the shader assigned, or -1 if no shader is assigned.

语法：

layer_get_shader(layer_id)

参数：

参数	描述
layer_id	The unique ID value of the layer to target (or the layer name as a string)

返回：

Shader Index or -1if no shader is assigned

例如：

if layer_get_shader(layer) == -1
   {
   layer_shader(layer, shd_Sepia);
   }

The above code will check to see if the layer that the instance running the code has a shader assigned to it and if it doesn't one is assigned.

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