SDL_shader_tools: README-SDL_gpu: Added note about using D3D, etc, directly.

From 085a30ffe0efa9856ce3956931c29e3df4d88d81 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Sat, 10 Jun 2023 19:10:35 -0400
Subject: [PATCH] README-SDL_gpu: Added note about using D3D, etc, directly.

---
 docs/README-SDL_gpu.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/docs/README-SDL_gpu.md b/docs/README-SDL_gpu.md
index c7ef954..4c5e809 100644
--- a/docs/README-SDL_gpu.md
+++ b/docs/README-SDL_gpu.md
@@ -116,6 +116,14 @@ DXIL? These formats are significantly (and in my personal opinion, unnecessarily
 and supporting them adds an enormous amount of complexity and risk to the project.
 
 
+## But I can still just use Direct3D, right?
+
+Yes! If you want to use any version of Direct3D, Vulkan, Metal, OpenGL, or whatever,
+you can do so, as always: SDL will provide you window handles and get out of your
+way so you can set up any rendering API to use directly. You are in no way forced to
+use the GPU API to use SDL3!
+
+
 ## Can I help fund this?
 
 YES. Initial work on this was funded by an Epic Megagrant, and while I'm