tree 47259d8bf50889d53d01e5bb9053228b4205aa10
parent 7e6989bc26d87c4f946b359c84fc5b099009cac0
author Stephen White <senorblanco@chromium.org> 1643044642 +0000
committer Tint LUCI CQ <tint-scoped@luci-project-accounts.iam.gserviceaccount.com> 1643044642 +0000

GLSL: implement CombineSamplers transform (string version).

This transform converts all separate texture/sampler references
in a program into combined texture/samplers. This is required for GLSL,
which does not support separate texture/samplers.

As input, the transform requires a map from the unique sampler/texture
pairs previously gathered by the Resolver to strings, which will be
used as the names of the newly-generated combined samplers. Note that
binding points are unused by GLSL, and so are set to (0, 0) with
collision detection disabled.

All function signatures containing textures or samplers are rewritten,
as well as function calls and texture intrinsic calls. For texture
intrinsic calls, a placeholder sampler is used to satisfy the subsequent
Resolver pass (GLSL texture intrinsics do not require a separate sampler,
but WGSL intrinsics do). The placeholder is also used if the shader
contains only texture references (e.g., textureLoad).

Bug: tint:1366

Change-Id: Iff8407d28fdc2a8adac5cb655707a08c8553c389
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/77080
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>