SDL: Fix #12142 - the problem was if the size of the vertex buffer was exceeded, the currentVertexBuffer would be reset to zero...

SDL Commits
1 
From 4fd0b2a85c9cca4b55602f0d805e26eaa8e74a24 Mon Sep 17 00:00:00 2001
From: danginsburg <[EMAIL REDACTED]>
Date: Mon, 10 Feb 2025 11:43:43 -0500
Subject: [PATCH] Fix #12142 - the problem was if the size of the vertex buffer
 was exceeded, the currentVertexBuffer would be reset to zero and thus we'd
 leave it pointing to an in-use VB that would get overwritten on the next
 present before the vkQueueSubmit occurred.

---
 src/render/vulkan/SDL_render_vulkan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/render/vulkan/SDL_render_vulkan.c b/src/render/vulkan/SDL_render_vulkan.c
index 7398315a85fc2..75036134dab76 100644
--- a/src/render/vulkan/SDL_render_vulkan.c
+++ b/src/render/vulkan/SDL_render_vulkan.c
@@ -3253,7 +3253,7 @@ static bool VULKAN_UpdateVertexBuffer(SDL_Renderer *renderer,
 
     stateCache->vertexBuffer = vertexBuffer->buffer;
 
-    rendererData->currentVertexBuffer++;
+    rendererData->currentVertexBuffer = vbidx + 1;
     if (rendererData->currentVertexBuffer >= SDL_VULKAN_NUM_VERTEX_BUFFERS) {
         rendererData->currentVertexBuffer = 0;
         rendererData->issueBatch = true;