Add color output check to early fragment sample count tests

Additional check for the edge cases, where the sample count value
is correct, but the color output value is wrong.

Components: Vulkan

VK-GL-CTS Issue: 3452

Affects: dEQP-VK.fragment_operations.early_fragment.sample_*

Change-Id: I19bfdd4f007a75580418fb61720ba06e82610291

diff --git a/external/vulkancts/modules/vulkan/fragment_ops/vktFragmentOperationsEarlyFragmentTests.cpp b/external/vulkancts/modules/vulkan/fragment_ops/vktFragmentOperationsEarlyFragmentTests.cpp
index 3a91202..e2adfbb 100644 (file)
--- a/external/vulkancts/modules/vulkan/fragment_ops/vktFragmentOperationsEarlyFragmentTests.cpp
+++ b/external/vulkancts/modules/vulkan/fragment_ops/vktFragmentOperationsEarlyFragmentTests.cpp
@@ -1664,6 +1664,8 @@ public:
        tcu::TestStatus         iterate                                                                 (void);
 
 private:
+       tcu::TextureLevel       generateReferenceColorImage                             (const tcu::TextureFormat format, const tcu::IVec2& renderSize);
+
        Move<VkRenderPass>      makeRenderPass                                                  (const DeviceInterface&         vk,
                                                                                                                                 const VkDevice                         device,
                                                                                                                                 const VkFormat                         colorFormat,
@@ -1847,6 +1849,16 @@ Move<VkRenderPass> EarlyFragmentSampleCountTestInstance::makeRenderPass  (const D
        return createRenderPass(vk, device, &renderPassInfo, DE_NULL);
 }
 
+tcu::TextureLevel EarlyFragmentSampleCountTestInstance::generateReferenceColorImage(const tcu::TextureFormat format, const tcu::IVec2 &renderSize)
+{
+       tcu::TextureLevel       image           (format, renderSize.x(), renderSize.y());
+       const tcu::Vec4         clearColor      = tcu::Vec4(0.0f, 0.0f, 0.0f, 1.0f);
+
+       tcu::clear(image.getAccess(), clearColor);
+
+       return image;
+}
+
 tcu::TestStatus EarlyFragmentSampleCountTestInstance::iterate (void)
 {
        const DeviceInterface&                          vk                                                      = m_context.getDeviceInterface();
@@ -2058,6 +2070,17 @@ tcu::TestStatus EarlyFragmentSampleCountTestInstance::iterate (void)
                submitCommandsAndWait(vk, device, queue, *cmdBuffer);
        }
 
+       // When early fragment test is enabled, all samples are killed in fragment shader. The result color should be black.
+       {
+               invalidateAlloc(vk, device, *colorBufferAllocEarly);
+
+               const tcu::ConstPixelBufferAccess       imagePixelAccess(mapVkFormat(colorFormat), renderSize.x(), renderSize.y(), 1, colorBufferAllocEarly->getHostPtr());
+               const tcu::TextureLevel                         referenceImage = generateReferenceColorImage(mapVkFormat(colorFormat), renderSize);
+
+               if (!tcu::floatThresholdCompare(m_context.getTestContext().getLog(), "Compare color output", "Early fragment image result comparison", referenceImage.getAccess(), imagePixelAccess, tcu::Vec4(0.02f), tcu::COMPARE_LOG_RESULT))
+                       return tcu::TestStatus::fail("Rendered color image is not correct");
+       }
+
        // The image has 32x32 pixels and each pixel has m_sampleCount samples. Half of these samples are discarded before sample counting.
        // This means the reference value for passed samples is ((32 x 32) / 2 / 2) * sampleCount.
        {