[WebGPU] Using the stencil reference value as the stencil clear value…

… fails when the reference value is greater than 255

https://bugs.webkit.org/show_bug.cgi?id=263812
<radar://117610399>

Reviewed by Tadeu Zagallo.

The stencil value is masked to the max value in the stencil buffer.

All of our stencil formats are 8 bits and that is not likely to change
as stencil formats have not changed in more than ten years, so mask with 255.

* LayoutTests/http/tests/webgpu/webgpu/api/operation/render_pass/clear_value-expected.txt:
* Source/WebGPU/WebGPU/RenderPassEncoder.mm:
(WebGPU::RenderPassEncoder::setStencilReference):

Canonical link: https://commits.webkit.org/269957@main

LayoutTests/http/tests/webgpu/webgpu/api/operation/render_pass/clear_value-expected.txt

@@ -1 +1,36 @@
-(Populate me when we're ready to investigate this test)
+
+PASS :stored:
+PASS :loaded:
+PASS :srgb:
+PASS :layout:
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=0;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=0;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=1;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=1;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=255;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=255;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=258;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=258;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=65539;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="stencil8";stencilClearValue=65539;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=0;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=0;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=1;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=1;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=255;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=255;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=258;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=258;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=65539;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth24plus-stencil8";stencilClearValue=65539;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=0;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=0;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=1;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=1;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=255;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=255;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=258;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=258;applyStencilClearValueAsStencilReferenceValue=false
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=65539;applyStencilClearValueAsStencilReferenceValue=true
+PASS :stencil_clear_value:stencilFormat="depth32float-stencil8";stencilClearValue=65539;applyStencilClearValueAsStencilReferenceValue=false
+

Source/WebGPU/WebGPU/RenderPassEncoder.mm

@@ -320,7 +320,7 @@
 
 void RenderPassEncoder::setStencilReference(uint32_t reference)
 {
-    [m_renderCommandEncoder setStencilReferenceValue:reference];
+    [m_renderCommandEncoder setStencilReferenceValue:(reference & 0xFF)];
 }
 
 void RenderPassEncoder::setVertexBuffer(uint32_t slot, const Buffer& buffer, uint64_t offset, uint64_t size)