From b74c683ea7e241d0592138db5f32f260fd95d8a4 Mon Sep 17 00:00:00 2001
From: Mark Lobodzinski <mark@lunarg.com>
Date: Wed, 1 Mar 2017 15:01:45 -0700
Subject: layers: Add alphaToOne device feature validation

Change-Id: I1633cf7a8a5ebeed797cdb5373e5eb2533ce6887
---
 layers/core_validation.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'layers/core_validation.cpp')

diff --git a/layers/core_validation.cpp b/layers/core_validation.cpp
index 5c8b7948..e5765aa5 100644
--- a/layers/core_validation.cpp
+++ b/layers/core_validation.cpp
@@ -3253,6 +3253,15 @@ static bool verifyPipelineCreateState(layer_data *dev_data, std::vector<PIPELINE
         if (pPipeline->graphicsPipelineCI.pRasterizationState->rasterizerDiscardEnable == VK_FALSE) {
             auto subpass_desc = renderPass ? &renderPass->createInfo.pSubpasses[pPipeline->graphicsPipelineCI.subpass] : nullptr;
 
+            if ((pPipeline->graphicsPipelineCI.pMultisampleState->alphaToOneEnable == VK_TRUE) &&
+                (!dev_data->enabled_features.alphaToOne)) {
+                skip_call |= log_msg(dev_data->report_data, VK_DEBUG_REPORT_ERROR_BIT_EXT, VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT,
+                                     0, __LINE__, VALIDATION_ERROR_01464, "DS",
+                                     "vkCreateGraphicsPipelines(): the alphaToOne device feature is disabled: the alphaToOneEnable "
+                                     "member of the VkPipelineMultisampleStateCreateInfo structure must be set to VK_FALSE.",
+                                     validation_error_map[VALIDATION_ERROR_01464]);
+            }
+
             // If subpass uses a depth/stencil attachment, pDepthStencilState must be a pointer to a valid structure
             if (subpass_desc && subpass_desc->pDepthStencilAttachment &&
                 subpass_desc->pDepthStencilAttachment->attachment != VK_ATTACHMENT_UNUSED) {
-- 
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