Vulkan: Allow user to specify preferred device

src/libANGLE/renderer/vulkan/RendererVk.cpp

@@ -488,7 +488,12 @@ ICDFilterFunc GetFilterForICD(vk::ICD preferredICD)
                                  strlen(kSwiftShaderDeviceName)) == 0));
             };
         default:
-            return [](const VkPhysicalDeviceProperties &deviceProperties) { return true; };
+            const std::string anglePreferredDevice =
+                angle::GetEnvironmentVar(vk::gANGLEPreferredDevice);
+            return [anglePreferredDevice](const VkPhysicalDeviceProperties &deviceProperties) {
+                return (anglePreferredDevice.empty() ||
+                        anglePreferredDevice == deviceProperties.deviceName);
+            };
     }
 }
 

src/libANGLE/renderer/vulkan/vk_utils.cpp

@@ -261,6 +261,7 @@ namespace vk
 {
 const char *gLoaderLayersPathEnv   = "VK_LAYER_PATH";
 const char *gLoaderICDFilenamesEnv = "VK_ICD_FILENAMES";
+const char *gANGLEPreferredDevice  = "ANGLE_PREFERRED_DEVICE";
 
 VkImageAspectFlags GetDepthStencilAspectFlags(const angle::Format &format)
 {

src/libANGLE/renderer/vulkan/vk_utils.h

@@ -117,6 +117,7 @@ void AddToPNextChain(VulkanStruct1 *chainStart, VulkanStruct2 *ptr)
 
 extern const char *gLoaderLayersPathEnv;
 extern const char *gLoaderICDFilenamesEnv;
+extern const char *gANGLEPreferredDevice;
 
 enum class ICD
 {