Jonah Williams 44f81fa6e8 [Impeller] dont use half precision constants / Fixes for SPIRV tools roll (flutter/engine#52213) ...

See b/335381180

In an upcoming version of SPIRV tools, these constants are being flagged as invalid. Due to some combination of the macros + inlining we're ending up with multiple precision modifiers on the constants:

```
third_party/flutter_engine/impeller/entity/shaders/radial_gradient_fill.frag: GLSL to SPIRV failed; Compilation error. 0 error(s) and 1 warning(s).
third_party/flutter_engine/impeller/entity/shaders/radial_gradient_fill.frag:14: warning: '' : all default precisions are highp; use precision statements to quiet warning, e.g.:
third_party/flutter_engine/impeller/entity/shaders/radial_gradient_fill.frag:          "precision mediump int; precision highp float;" 
shaderc: internal error: compilation succeeded but failed to optimize: ID '112' decorated with RelaxedPrecision multiple times is not allowed.
  %float_n0_474999994 = OpConstant %float -0.474999994
  ```
  
  We don't really benefit from half precision on these, since we're either using them for equality or can cheaply convert to half precision anyway.

2024-04-18 23:08:02 +00:00

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src/flutter

[Impeller] dont use half precision constants / Fixes for SPIRV tools roll (flutter/engine#52213)

2024-04-18 23:08:02 +00:00