Update glsl to match README.md, which seems to have appropriate dimensions
Update glsl to match README.md, which seems to have appropriate dimensions

Heart2009/shader-school,stackgl/shader-school,sksullivan/shader-school,Heart2009/shader-school,sksullivan/shader-school,stackgl/shader-school,zhakui/shader-school,zhakui/shader-school,sksullivan/shader-school