Init commit

assets/shaders/shadow_depth_vs.hlsl

@@ -0,0 +1,20 @@
+#pragma pack_matrix(row_major)
+
+cbuffer CBPerObj : register(b2) {
+    row_major float4x4 gWorld;
+    row_major float4x4 gWorldInvTranspose; // 深度阶段不用，但保持 CPU 布局契约一致
+};
+
+cbuffer CBShadow : register(b3) {
+    row_major float4x4 gLightViewProjection;
+    float4 gShadowParams;
+};
+
+struct VSInput {
+    float3 positionOS : POSITION;
+};
+
+float4 VSMain(VSInput input) : SV_POSITION {
+    const float4 positionWS = mul(float4(input.positionOS, 1.0f), gWorld);
+    return mul(positionWS, gLightViewProjection);
+}