In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Enumerate the number of physical devices or GPUs on the existing system and get the vkEnumeratePhysicalDevices() API."

A block of code is set as follows:

  foreach  layerProperty{ 
         VkExtensionProperties *instanceExtensions; 
         res = vkEnumerateInstanceExtensionProperties(layer_name, 
                     &instanceExtensionCount, instanceExtensions); 
      }

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

 // Specify extensions that needs to be enabled on instance. 
       instanceInfo.ppEnabledExtensionNames = { 
                         VK_KHR_SURFACE_EXTENSION_NAME,  
                         VK_KHR_WIN32_SURFACE_EXTENSION_NAME}; 
 
      // Create the Instance object 
       vkCreateInstance(&instanceInfo, NULL, &instance);

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "This can be done by simply placing a tick against the Add Python <version> to PATH checkbox."