antoineMoPa/convert_webgl_shader_2_to_1.md

## convert_webgl_shader_2_to_1.md

      
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              convert_webgl_shader_2_to_1.md
            
          
    Converting a GLSL 3 Shader back to GLSL 1 for webgl1

Let's say you have a modern shader written in glsl 300, but you need to make it work with webgl1.
Remove:
#version 300 es
Replace:
in,out -> varying
texture -> texture2D

gl_FragColor

With webgl es, you define whatever variable you will use for color. In webgl2 with GLSL 300, it's always gl_FragColor
Set color with:
gl_FragColor = whatever_vec4_variable