Bug 264449 – [WebGPU] Clamp depth values to the viewport range

• Component: WebGPU
• Status: RESOLVED FIXED

[Mike Wyrzykowski]

[WGSL] Emit code gen for clamping depth to the viewport

This only impacts when frag_depth / ([[depth(any)]] ) is used in the shader.

Something like this I think would work:

struct FragOutput {
...
float depthValue [[depth(any)]];
};

void fragmentShader(const constant unsigned* __DynamicOffsets [[buffer(4)]]) {
  FragOutput o;
...
  float minDepth = as_type<float>(__DynamicOffsets[maxDynamicOffsetIndex + 1]);
  float maxDepth = as_type<float>(__DynamicOffsets[maxDynamicOffsetIndex + 2]);
  o.depthValue = clamp(o.depthValue, minDepth, maxDepth);
}

[Radar WebKit Bug Importer]

<rdar://problem/118144869>

[Mike Wyrzykowski]

Pull request: https://github.com/WebKit/WebKit/pull/24039

[EWS]

Committed 274666@main (d8d655468dab): <https://commits.webkit.org/274666@main>

Reviewed commits have been landed. Closing PR #24039 and removing active labels.

[Mike Wyrzykowski]

Reverted by https://github.com/WebKit/WebKit/pull/24536

[Mike Wyrzykowski]

Pull request: https://github.com/WebKit/WebKit/pull/24536

[EWS]

Committed 274769@main (b9e6095447e8): <https://commits.webkit.org/274769@main>

Reviewed commits have been landed. Closing PR #24536 and removing active labels.

[Mike Wyrzykowski]

Re-opening for pull request https://github.com/WebKit/WebKit/pull/24558

[EWS]

Committed 274856@main (57f26e7cc5c4): <https://commits.webkit.org/274856@main>

Reviewed commits have been landed. Closing PR #24558 and removing active labels.