Make USE_DRAW_PROCEDURAL variation only for vertex programs in UberPost shader #6260
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Purpose of this PR
This PR fixes https://fogbugz.unity3d.com/f/cases/1377405/
UberPost has a lot of fragment shader variants that use _USE_DRAW_PROCEDURAL. In fact, removing this keyword (again, only in fragment shaders) with the URP template project reduced its number of variants from 1279 to 639 in 2020.3.18. The change reduces the shader's memory usage from ~12MB to ~6MB. So this PR simply makes _USE_DRAW_PROCEDURAL compile only for vertex shaders by changing its declaration in UberPost shader from
#pragma multi_compile
to#pragma multi_compile_vertex
.Testing status
Manually looked if results are visually correct and affected (before and after change) in URP Post Processing project + editor
Yamato tests on Post Processing and XR
Comments to reviewers
OSX Metal test fails on master branch with 137 error code.