chore(build): use SDL3

vendor/sdl-3.2.10/test/testgpu/cube.hlsl

@@ -0,0 +1,31 @@
+#define REG(reg, space) register(reg, space)
+
+cbuffer UBO : REG(b0, space1)
+{
+    float4x4 ModelViewProj;
+};
+
+struct VSInput
+{
+    float3 Position : TEXCOORD0;
+    float3 Color : TEXCOORD1;
+};
+
+struct VSOutput
+{
+    float4 Color : TEXCOORD0;
+    float4 Position : SV_Position;
+};
+
+VSOutput VSMain(VSInput input)
+{
+    VSOutput output;
+    output.Color = float4(input.Color, 1.0f);
+    output.Position = mul(ModelViewProj, float4(input.Position, 1.0f));
+    return output;
+}
+
+float4 PSMain(VSOutput input) : SV_Target0
+{
+    return input.Color;
+}