image_clearing test: lower the threshold for clear validation

diff --git a/external/vulkancts/modules/vulkan/api/vktApiImageClearingTests.cpp b/external/vulkancts/modules/vulkan/api/vktApiImageClearingTests.cpp
index 077162f..4f77a56 100644 (file)
--- a/external/vulkancts/modules/vulkan/api/vktApiImageClearingTests.cpp
+++ b/external/vulkancts/modules/vulkan/api/vktApiImageClearingTests.cpp
@@ -183,10 +183,11 @@ bool comparePixelToColorClearValue (const ConstPixelBufferAccess& access,
                                                                         ref.float32[1],
                                                                         ref.float32[2],
                                                                         ref.float32[3]);
-                       const Vec4      threshold       (bitDepth[0] > 0 ? 20.0f / (float)((1 << bitDepth[0]) - 1) : 1.0f,
-                                                                        bitDepth[1] > 0 ? 20.0f / (float)((1 << bitDepth[1]) - 1) : 1.0f,
-                                                                        bitDepth[2] > 0 ? 20.0f / (float)((1 << bitDepth[2]) - 1) : 1.0f,
-                                                                        bitDepth[3] > 0 ? 20.0f / (float)((1 << bitDepth[3]) - 1) : 1.0f);
+                       const int       modifier        = (channelClass == TEXTURECHANNELCLASS_UNSIGNED_FIXED_POINT) ? 0 : 1;
+                       const Vec4      threshold       (bitDepth[0] > 0 ? 1.0f / ((float)(1 << (bitDepth[0] - modifier)) - 1.0f) : 1.0f,
+                                                                        bitDepth[1] > 0 ? 1.0f / ((float)(1 << (bitDepth[1] - modifier)) - 1.0f) : 1.0f,
+                                                                        bitDepth[2] > 0 ? 1.0f / ((float)(1 << (bitDepth[2] - modifier)) - 1.0f) : 1.0f,
+                                                                        bitDepth[3] > 0 ? 1.0f / ((float)(1 << (bitDepth[3] - modifier)) - 1.0f) : 1.0f);
 
                        if (isSRGB(access.getFormat()))
                                refColor        = linearToSRGB(refColor);