Only report on first texture builtin error (#3919)

Each texture test tests 50 calls to `textureXXX`. It then
checks they all match as expected. For each one that does NOT match
expected a slow binary search happens to find the samples that
influenced the results.

This change makes it so only the first failure does this slow
check. Ideally no tests would fail but when they do, checking all
50 sample points can cause test bots to timeout.

src/webgpu/shader/execution/expression/call/builtin/texture_utils.ts

@@ -1308,7 +1308,7 @@ export async function checkCallResults<T extends Dimensionality>(
       ? getMaxFractionalDiffForTextureFormat(texture.descriptor.format)
       : 0;
 
-  for (let callIdx = 0; callIdx < calls.length /*&& errs.length === 0*/; callIdx++) {
+  for (let callIdx = 0; callIdx < calls.length; callIdx++) {
     const call = calls[callIdx];
     const gotRGBA = results[callIdx];
     const expectRGBA = softwareTextureReadLevel(t, call, texture, sampler, call.mipLevel ?? 0);
@@ -1356,7 +1356,11 @@ export async function checkCallResults<T extends Dimensionality>(
       return { absDiff, relDiff, ulpDiff };
     });
 
-    const fix5 = (n: number) => n.toFixed(5);
+    const isFloatType = (format: GPUTextureFormat) => {
+      const info = kTextureFormatInfo[format];
+      return info.color?.type === 'float' || info.depth?.type === 'depth';
+    };
+    const fix5 = (n: number) => (isFloatType(format) ? n.toFixed(5) : n.toString());
     const fix5v = (arr: number[]) => arr.map(v => fix5(v)).join(', ');
     const rgbaToArray = (p: PerTexelComponent<number>): number[] =>
       rgbaComponentsToCheck.map(component => p[component]!);
@@ -1410,6 +1414,10 @@ export async function checkCallResults<T extends Dimensionality>(
         errs.push('  sample points:');
         errs.push(layoutTwoColumns(expectedSamplePoints, gotSamplePoints).join('\n'));
         errs.push('', '');
+
+        // This path is slow so if we took it, don't report the other errors. One is enough
+        // to fail the test.
+        break;
       }
     }
   }