Allow VS-only pipeline

This has really spotty coverage [see VK-GL-CTS #1770], but is legal. Test: dEQP-VK.api.descriptor_set.descriptor_set_layout_lifetime.graphics Change-Id: I1452fb7a2146e882f6d792d153135ff8b474aca4 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/31069Tested-by: Chris Forbes <chrisforbes@google.com> Presubmit-Ready: Chris Forbes <chrisforbes@google.com> Kokoro-Presubmit: kokoro <noreply+kokoro@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com>

Allow VS-only pipeline
d084824e · Chris Forbes · 0b8234b4 · d084824e
Commit d084824e authored May 09, 2019 by Chris Forbes
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VkPipeline.cpp src/Vulkan/VkPipeline.cpp +2 -1

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--- a/src/Vulkan/VkPipeline.cpp
+++ b/src/Vulkan/VkPipeline.cpp
@@ -237,7 +237,6 @@ GraphicsPipeline::GraphicsPipeline(const VkGraphicsPipelineCreateInfo* pCreateIn
 		~(VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT |
 	      VK_PIPELINE_CREATE_DERIVATIVE_BIT |
 	      VK_PIPELINE_CREATE_ALLOW_DERIVATIVES_BIT)) != 0) ||
-	   (pCreateInfo->stageCount != 2) ||
 	   (pCreateInfo->pTessellationState != nullptr))
 	{
 		UNIMPLEMENTED("pCreateInfo settings");
@@ -464,10 +463,12 @@ void GraphicsPipeline::compileShaders(const VkAllocationCallbacks* pAllocator, c
 		switch (pStage->stage)
 		{
 		case VK_SHADER_STAGE_VERTEX_BIT:
+			ASSERT(vertexShader == nullptr);
 			context.vertexShader = vertexShader = spirvShader;
 			break;

 		case VK_SHADER_STAGE_FRAGMENT_BIT:
+			ASSERT(fragmentShader == nullptr);
 			context.pixelShader = fragmentShader = spirvShader;
 			break;