SDL: Fix D3D12 DSV creation for array/cube/cube-array depth textures (76ff7)

SDL Commits
1 
From 76ff74eeab612ee532622e310487ff89799151f4 Mon Sep 17 00:00:00 2001
From: Jesse Chounard <[EMAIL REDACTED]>
Date: Thu, 19 Feb 2026 07:42:04 -0600
Subject: [PATCH] Fix D3D12 DSV creation for array/cube/cube-array depth
 textures

DSV creation was missing a TEXTURE2DARRAY branch for array, cube, and
cube-array depth textures. It fell through to TEXTURE2D, so
FirstArraySlice was never set and all layers' DSVs targeted layer 0.
This caused incorrect rendering when using depth textures with multiple
layers, such as cubemap shadow maps.
---
 src/gpu/d3d12/SDL_gpu_d3d12.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gpu/d3d12/SDL_gpu_d3d12.c b/src/gpu/d3d12/SDL_gpu_d3d12.c
index f2e190cdb9c28..6a85c6e6d04c5 100644
--- a/src/gpu/d3d12/SDL_gpu_d3d12.c
+++ b/src/gpu/d3d12/SDL_gpu_d3d12.c
@@ -3600,7 +3600,12 @@ static D3D12Texture *D3D12_INTERNAL_CreateTexture(
                 dsvDesc.Format = SDLToD3D12_DepthFormat[createinfo->format];
                 dsvDesc.Flags = (D3D12_DSV_FLAGS)0;
 
-                if (isMultisample) {
+                if (createinfo->type == SDL_GPU_TEXTURETYPE_2D_ARRAY || createinfo->type == SDL_GPU_TEXTURETYPE_CUBE || createinfo->type == SDL_GPU_TEXTURETYPE_CUBE_ARRAY) {
+                    dsvDesc.ViewDimension = D3D12_DSV_DIMENSION_TEXTURE2DARRAY;
+                    dsvDesc.Texture2DArray.MipSlice = levelIndex;
+                    dsvDesc.Texture2DArray.FirstArraySlice = layerIndex;
+                    dsvDesc.Texture2DArray.ArraySize = 1;
+                } else if (isMultisample) {
                     dsvDesc.ViewDimension = D3D12_DSV_DIMENSION_TEXTURE2DMS;
                 } else {
                     dsvDesc.ViewDimension = D3D12_DSV_DIMENSION_TEXTURE2D;