SDL: Fix SDL GPU D3D12 Descriptor Heap leak (c74b4)

SDL Commits
1 
From c74b406a4c813e8fa6d644de980d2265528b2d9e Mon Sep 17 00:00:00 2001
From: Edu Garcia <[EMAIL REDACTED]>
Date: Thu, 9 Oct 2025 14:43:11 +0100
Subject: [PATCH] Fix SDL GPU D3D12 Descriptor Heap leak

When descriptor leaks overflow, the D3D12 SDL GPU renderer fetches more from the pool, but never returns them, which eventually causes an "out of memory" crash.
---
 src/gpu/d3d12/SDL_gpu_d3d12.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/gpu/d3d12/SDL_gpu_d3d12.c b/src/gpu/d3d12/SDL_gpu_d3d12.c
index 28a7c5ce57535..85e397a898dc3 100644
--- a/src/gpu/d3d12/SDL_gpu_d3d12.c
+++ b/src/gpu/d3d12/SDL_gpu_d3d12.c
@@ -4885,7 +4885,14 @@ static void D3D12_INTERNAL_SetGPUDescriptorHeaps(D3D12CommandBuffer *commandBuff
     viewHeap = D3D12_INTERNAL_AcquireGPUDescriptorHeapFromPool(commandBuffer, D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);
     samplerHeap = D3D12_INTERNAL_AcquireGPUDescriptorHeapFromPool(commandBuffer, D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER);
 
+    if (commandBuffer->gpuDescriptorHeaps[0] != NULL) {
+        D3D12_INTERNAL_ReturnGPUDescriptorHeapToPool(commandBuffer->renderer, commandBuffer->gpuDescriptorHeaps[0]);
+    }
     commandBuffer->gpuDescriptorHeaps[0] = viewHeap;
+
+    if (commandBuffer->gpuDescriptorHeaps[1] != NULL) {
+        D3D12_INTERNAL_ReturnGPUDescriptorHeapToPool(commandBuffer->renderer, commandBuffer->gpuDescriptorHeaps[1]);
+    }
     commandBuffer->gpuDescriptorHeaps[1] = samplerHeap;
 
     heaps[0] = viewHeap->handle;