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3 Commits

Author SHA1 Message Date
Ben Clayton
4d3ff9711e tint: Resolve @builtin() args as expressions 
This CL makes the builtin argument resolve as a shadowable enumerator
expression.

Bug: tint:1841
Bug: tint:1845
Change-Id: I2aaa2c63025752f25c113cf2fb38f4d91c2c16c2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/120680
Kokoro: Ben Clayton <bclayton@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: James Price <jrprice@google.com>
 2023-02-21 17:33:54 +00:00
Ben Clayton
c6b381495d tint/transform: Refactor transforms 
Replace the ShouldRun() method with Apply() which will do the
transformation if it needs to be done, otherwise returns
'SkipTransform'.

This reduces a bunch of duplicated scanning between the old ShouldRun()
and Transform().

This change also adjusts code style to make the transforms more
consistent.

Change-Id: I9a6b10cb8b4ed62676b12ef30fb7764d363386c6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107681
Reviewed-by: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
 2022-11-03 08:41:19 +00:00
Corentin Wallez
98a7cd11af Add a ClampFragDepth transform. 
Add clamping of the @builtin(frag_depth) output of fragment shaders using
two push constantsprovided by the outside environment. For example the
following code:

  @fragment fn main() -> @builtin(frag_depth) f32 {
      return 0.0;
  }

Is transformed to:

  enable chromium_experimental_push_constant;

  struct FragDepthClampArgs {
    min : f32,
    max : f32,
  }

  var<push_constant> frag_depth_clamp_args : FragDepthClampArgs;

  fn clamp_frag_depth(v : f32) -> f32 {
    return clamp(v, frag_depth_clamp_args.min, frag_depth_clamp_args.max);
  }

  @fragment
  fn main() -> @builtin(frag_depth) f32 {
    return clamp_frag_depth(0.0);
  }

Fixed: tint:1620
Change-Id: Id403c4813fb2698aa87630abc30d26f02d53634a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/104980
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
 2022-10-11 09:52:25 +00:00