Do not attempt to initialize dynamic state vars with pipeline state

Pipeline variables, like scissor, viewport and blend constants, may
not be provided by the pipeline state if they are set to use the
dynamic state instead. In that case, the related initialization
structures may be null and should not be used.

Bug b/118619338

Change-Id: Ieb5ff066b06ecfe444c6d26e43c70fd18d2f9c31
Tests: dEQP-VK.image.texel_view_compatible.graphic.extended.*
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29053
Tested-by: Alexis Hétu <sugoi@google.com>
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

src/Vulkan/VkPipeline.cpp

diff --git a/src/Vulkan/VkPipeline.cpp b/src/Vulkan/VkPipeline.cpp
index 815923f..d4d53e1 100644
--- a/src/Vulkan/VkPipeline.cpp
+++ b/src/Vulkan/VkPipeline.cpp
@@ -313,8 +313,15 @@
 			UNIMPLEMENTED("pCreateInfo->pViewportState settings");
 		}
 
-		scissor = viewportState->pScissors[0];
-		viewport = viewportState->pViewports[0];
+		if(!hasDynamicState(VK_DYNAMIC_STATE_SCISSOR))
+		{
+			scissor = viewportState->pScissors[0];
+		}
+
+		if(!hasDynamicState(VK_DYNAMIC_STATE_VIEWPORT))
+		{
+			viewport = viewportState->pViewports[0];
+		}
 	}
 
 	const VkPipelineRasterizationStateCreateInfo* rasterizationState = pCreateInfo->pRasterizationState;
@@ -393,10 +400,13 @@
 			UNIMPLEMENTED("colorBlendState");
 		}
 
-		blendConstants.r = colorBlendState->blendConstants[0];
-		blendConstants.g = colorBlendState->blendConstants[1];
-		blendConstants.b = colorBlendState->blendConstants[2];
-		blendConstants.a = colorBlendState->blendConstants[3];
+		if(!hasDynamicState(VK_DYNAMIC_STATE_BLEND_CONSTANTS))
+		{
+			blendConstants.r = colorBlendState->blendConstants[0];
+			blendConstants.g = colorBlendState->blendConstants[1];
+			blendConstants.b = colorBlendState->blendConstants[2];
+			blendConstants.a = colorBlendState->blendConstants[3];
+		}
 
 		if(colorBlendState->attachmentCount == 1)
 		{