Fixes for no attachments being an error. (#3927)

Previously Dawn didn't correctly validate that render pipelines with no
attachments are errors. After fixing Dawn some CTS tests hit the new
validation. Fix them up to follow the WebGPU spec.

See #3754

src/webgpu/api/validation/capability_checks/limits/maxInterStageShaderVariables.spec.ts

@@ -20,6 +20,7 @@ function getPipelineDescriptor(device: GPUDevice, testValue: number): GPURenderP
       module,
       entryPoint: 'vs',
     },
+    depthStencil: { format: 'depth32float', depthWriteEnabled: true, depthCompare: 'always' },
   };
 }
 

src/webgpu/api/validation/capability_checks/limits/maxVertexAttributes.spec.ts

@@ -19,6 +19,7 @@ function getPipelineDescriptor(device: GPUDevice, lastIndex: number): GPURenderP
         },
       ],
     },
+    depthStencil: { format: 'depth32float', depthWriteEnabled: true, depthCompare: 'always' },
   };
 }
 

src/webgpu/api/validation/capability_checks/limits/maxVertexBufferArrayStride.spec.ts

@@ -32,6 +32,7 @@ function getPipelineDescriptor(device: GPUDevice, testValue: number): GPURenderP
         },
       ],
     },
+    depthStencil: { format: 'depth32float', depthWriteEnabled: true, depthCompare: 'always' },
   };
 }
 

src/webgpu/api/validation/capability_checks/limits/maxVertexBuffers.spec.ts

@@ -19,6 +19,7 @@ function getPipelineDescriptor(device: GPUDevice, testValue: number): GPURenderP
       module,
       buffers,
     },
+    depthStencil: { format: 'depth32float', depthWriteEnabled: true, depthCompare: 'always' },
   };
 }
 

src/webgpu/api/validation/layout_shader_compat.spec.ts

@@ -253,6 +253,7 @@ g.test('pipeline_layout_shader_exact_match')
               code: vertexShader,
             }),
           },
+          depthStencil: { format: 'depth32float', depthWriteEnabled: true, depthCompare: 'always' },
         });
         break;
       }

src/webgpu/api/validation/render_pipeline/misc.spec.ts

@@ -36,7 +36,7 @@ g.test('no_attachment')
 g.test('vertex_state_only')
   .desc(
     `Tests creating vertex-state-only render pipeline. A vertex-only render pipeline has no fragment
-state (and thus has no color state), and can be created with or without depth stencil state.`
+state (and thus has no color state), and must have a depth-stencil state as an attachment is required.`
   )
   .params(u =>
     u
@@ -76,7 +76,7 @@ state (and thus has no color state), and can be created with or without depth st
       targets: hasColor ? [{ format: 'rgba8unorm' }] : [],
     });
 
-    t.doCreateRenderPipelineTest(isAsync, true, descriptor);
+    t.doCreateRenderPipelineTest(isAsync, depthStencilState !== undefined, descriptor);
   });
 
 g.test('pipeline_layout,device_mismatch')

src/webgpu/api/validation/shader_module/entry_point.spec.ts

@@ -128,6 +128,7 @@ and check that the APIs only accept matching entryPoint.
         module: t.device.createShaderModule({ code }),
         entryPoint,
       },
+      depthStencil: { format: 'depth32float', depthWriteEnabled: true, depthCompare: 'always' },
     };
     let _success = true;
     if (shaderModuleStage !== 'vertex') {
@@ -258,6 +259,7 @@ an undefined entryPoint is valid if there's an extra shader stage.
         }),
         entryPoint: undefined,
       },
+      depthStencil: { format: 'depth32float', depthWriteEnabled: true, depthCompare: 'always' },
     };
 
     const success = extraShaderModuleStage !== 'vertex';