Unity shader learning 004 shader debugging platform difference third-party debugging tools

Learning time ：

2022.5.27

Learning output ：

1. debugging Shader

1.1 We turn on FrameDebug window

Frame Debugger Let's observe the rendering process of a frame separately , Observe every DrawCall The rendering of , It will bring DrawCall One by one in order , By clicking on each DrawCall, You can see the execution to this DrawCall Rendering when , Step by step, you can see the whole scene rendering and the very detailed construction process .

1.2 adopt FrameDebug Window view us shader Render the state of the target

For example, here is a forward rendering Cube

1. First Shader yes Unlit/004,SubShader #0 Because of our shader There is only one render channel

SubShader Is a sub shader of the entire shader , When one Mesh（ grid ） When it needs to be drawn ,Unity Will be in Shader Find a way to render it , And from Shader Choose the first one that can be fully supported SubShader To achieve . To make the material , Or let the game screen play its best effect on different platforms , We can define more than one SubShader. every last SubShader All contain complete rendering parameters , Render settings , Rendering methods, etc . In the beginning stage , We write a for materials SubShader that will do , We can leave the rest of the work to the powerful FallBack To complete .

2. Then our passage Pass yes #0

3.ZClip Set up GPU Depth clip mode

4.ZTest Deep inspection LessEqual Less than the target

​ LEqual Draw geometry in front of or at the same distance from existing geometry . Do not draw geometry behind existing geometry .

​ ShaderLab command ：ZTest - Unity manual

5.ZWrite： Depth write , When enabled, determines whether the depth value of the slice is written to the depth buffer , Configurable

2. Platform differences

2.1 Anti-Aliasing

Because of us Unity It's cross platform , So there is OpenGL and DirectX Two coordinate systems
Usually ,Unity It will help us turn over automatically

however , If anti aliasing is turned on , that DX platform , You need to manually flip
Unity In this way, anti aliasing is turned on （Anti Aliasing）

The method of manual turnover , Is to first judge whether it is DX platform , Then determine whether anti aliasing is enabled , If all is satisfied , Then flip
[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-YzkCKEBZ-1655041487014)(https://liuwenxin-oss.oss-cn-hangzhou.aliyuncs.com/img/4cbba614e4f348858f2809c17e776dc0.png)]
Pictured ,Unity yes DX platform

2.2 DX The platform defines variables more strictly

3. Third party debugging tools

Intel Graphics Performance Analyzers

Snapdragon Profiler - Qualcomm Developer Network