SDL: GPU: Set missing fields on Vulkan swapchain texture (#15606)

SDL Commits
1 
From 86296ac8f01597076979630667472a846b04ce46 Mon Sep 17 00:00:00 2001
From: Evan Hemsley <[EMAIL REDACTED]>
Date: Fri, 15 May 2026 11:43:57 -0700
Subject: [PATCH] GPU: Set missing fields on Vulkan swapchain texture (#15606)

---
 src/gpu/vulkan/SDL_gpu_vulkan.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gpu/vulkan/SDL_gpu_vulkan.c b/src/gpu/vulkan/SDL_gpu_vulkan.c
index b7983859d8786..3b9efe5c45be2 100644
--- a/src/gpu/vulkan/SDL_gpu_vulkan.c
+++ b/src/gpu/vulkan/SDL_gpu_vulkan.c
@@ -4900,6 +4900,9 @@ static Uint32 VULKAN_INTERNAL_CreateSwapchain(
         windowData->textureContainers[i].activeTexture->aspectFlags = VK_IMAGE_ASPECT_COLOR_BIT;
         windowData->textureContainers[i].activeTexture->depth = 1;
         windowData->textureContainers[i].activeTexture->usage = SDL_GPU_TEXTUREUSAGE_COLOR_TARGET;
+        windowData->textureContainers[i].activeTexture->levelCount = 1;
+        windowData->textureContainers[i].activeTexture->layerCount = 1;
+        windowData->textureContainers[i].activeTexture->type = SDL_GPU_TEXTURETYPE_2D;
         windowData->textureContainers[i].activeTexture->container = &windowData->textureContainers[i];
         SDL_SetAtomicInt(&windowData->textureContainers[i].activeTexture->referenceCount, 0);