Debug No4 use renderdoc to troubleshoot bugs

1. No outline is drawn , It indicates that there is a problem with vertex data transmission ,Shader Unable to interpret data .

VS2019 Running results   No false information .

2. RenderDoc in

Tips ：fragment There is a mistake . So I guess it may be fragment Texture problems involved in . One is Shader dial the wrong number , The other is

  The reason for the error , Multiple texture units , Every time you need to rebind . To write let Shader Understand the procedure , If you don't explain who is _texture, still _texture2, that shader Unable to resolve . in other words , Each in the loop is a separate program , So you need to rebind the texture .（ In the tutorial , No texture unit is specified , Because it is a single texture unit, the default is 0. There is no need to specify ）

  summary ： RenderDoc and VS Report more errors than . It can help you locate the problem , It saves a lot of time .

However, we should review the rendering process to avoid such problems .~ hope Bug less and less