GPU: Request sampleRateShading feature on Vulkan

include/SDL3/SDL_gpu.h

@@ -222,6 +222,7 @@
  * - `depthClamp`
  * - `shaderClipDistance`
  * - `drawIndirectFirstInstance`
+ * - `sampleRateShading`
  *
  * **D3D12:** Supported on Windows 10 or newer, Xbox One (GDK), and Xbox
  * Series X|S (GDK). Requires a GPU that supports DirectX 12 Feature Level

src/gpu/vulkan/SDL_gpu_vulkan.c

@@ -11132,7 +11132,8 @@ static Uint8 VULKAN_INTERNAL_IsDeviceSuitable(
         !deviceFeatures.imageCubeArray ||
         !deviceFeatures.depthClamp ||
         !deviceFeatures.shaderClipDistance ||
-        !deviceFeatures.drawIndirectFirstInstance) {
+        !deviceFeatures.drawIndirectFirstInstance ||
+        !deviceFeatures.sampleRateShading) {
         return 0;
     }
 
@@ -11379,6 +11380,7 @@ static Uint8 VULKAN_INTERNAL_CreateLogicalDevice(
     desiredDeviceFeatures.depthClamp = VK_TRUE;
     desiredDeviceFeatures.shaderClipDistance = VK_TRUE;
     desiredDeviceFeatures.drawIndirectFirstInstance = VK_TRUE;
+    desiredDeviceFeatures.sampleRateShading = VK_TRUE;
 
     if (haveDeviceFeatures.fillModeNonSolid) {
         desiredDeviceFeatures.fillModeNonSolid = VK_TRUE;