Shader error in 'xxx': Arithmetic instruction limit of 64 exceeded....的解决方法

Shader error in 'xxx': Arithmetic instruction limit of 64 exceeded; 65 arithmetic instructions needed to compile program

需要定义#pragma target 3.0

• #pragma target 2.0 (default) - roughly shader model 2.0
  • Shader Model 2.0 on Direct3D 9.
  • Limited amount of arithmetic & texture instructions; no vertex texture sampling; no derivatives in fragment shaders.
• #pragma target 3.0 - compile to shader model 3.0:
  • Shader Model 3.0 on Direct3D 9.
• #pragma target 4.0 - compile to DX10 shader model 4.0. This target is currently only supported by DirectX 11 and XboxOne/PS4 platforms.
• #pragma target 5.0 - compile to DX11 shader model 5.0. This target is currently only supported by DirectX 11 and XboxOne/PS4 platforms.