[GPU] Shaders to common, xb buildshaders instead of buildhlsl

src/xenia/gpu/shaders/host_depth_store.hlsli

@@ -0,0 +1,40 @@
+#ifndef XENIA_GPU_D3D12_SHADERS_HOST_DEPTH_STORE_HLSLI_
+#define XENIA_GPU_D3D12_SHADERS_HOST_DEPTH_STORE_HLSLI_
+
+cbuffer XeHostDepthStoreRectangleConstants : register(b0) {
+  uint xe_host_depth_store_rectangle;
+};
+
+cbuffer XeHostDepthStoreRenderTargetConstants : register(b1) {
+  uint xe_host_depth_store_render_target;
+};
+RWBuffer<uint4> xe_host_depth_store_dest : register(u0);
+
+uint2 XeHostDepthStoreOrigin() {
+  return ((xe_host_depth_store_rectangle.xx >> uint2(0u, 10u)) & 0x3FFu) << 3u;
+}
+
+uint XeHostDepthStoreWidthDiv8Minus1() {
+  return (xe_host_depth_store_rectangle >> 20u) & 0x3FFu;
+}
+
+// As host depth is needed for at most one transfer destination per update, base
+// is not passed to the shader - (0, 0) of the render target is at 0 of the
+// destination buffer.
+
+uint XeHostDepthStorePitchTiles() {
+  return xe_host_depth_store_render_target & 0x3FFu;
+}
+
+uint XeHostDepthStoreResolutionScale() {
+  return (xe_host_depth_store_render_target >> 10u) & 0x3u;
+}
+
+uint XeHostDepthStoreSecondSampleIndex() {
+  return (xe_host_depth_store_render_target >> 12u) & 0x3u;
+}
+
+// 40-sample columns are not swapped for addressing simplicity (because this is
+// used for depth -> depth transfers, where swapping isn't needed).
+
+#endif  // XENIA_GPU_D3D12_SHADERS_HOST_DEPTH_STORE_HLSLI_