Mesa (main): d3d12: fix return-code without dxcompiler.dll

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Module: Mesa
Branch: main
Commit: 837f781c9a4f909ac1ee0b3b8331af87301b5fc3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=837f781c9a4f909ac1ee0b3b8331af87301b5fc3

Author: Erik Faye-Lund <erik.faye-lund at collabora.com>
Date:   Tue Apr  5 08:40:42 2022 +0200

d3d12: fix return-code without dxcompiler.dll

When we don't have a good dxcompiler.dll that we can load IDxcLibrary
from to help with diagnostics, we currently return true for validation
even if the validation actually failed.

Let's fix that, and also add a debug-message explaining what went wrong
for those who are debugging and wondering what's up.

Fixes: 2ea15cd661c ("d3d12: introduce d3d12 gallium driver")
Reviewed-by: Jesse Natalie <jenatali at microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15744>

---

 src/gallium/drivers/d3d12/d3d12_compiler.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/d3d12/d3d12_compiler.cpp b/src/gallium/drivers/d3d12/d3d12_compiler.cpp
index f52ce424c86..da42eb14954 100644
--- a/src/gallium/drivers/d3d12/d3d12_compiler.cpp
+++ b/src/gallium/drivers/d3d12/d3d12_compiler.cpp
@@ -1590,7 +1590,13 @@ bool d3d12_validation_tools::validate_and_sign(struct blob *dxil)
    validator->Validate(&source, DxcValidatorFlags_InPlaceEdit, &result);
    HRESULT validationStatus;
    result->GetStatus(&validationStatus);
-   if (FAILED(validationStatus) && library) {
+   if (FAILED(validationStatus)) {
+      if (!library) {
+         debug_printf("D3D12: validation failed, but lacking "
+                      "IDxcLibrary for proper diagnostics.\n");
+         return false;
+      }
+
       ComPtr<IDxcBlobEncoding> printBlob, printBlobUtf8;
       result->GetErrorBuffer(&printBlob);
       library->GetBlobAsUtf8(printBlob.Get(), printBlobUtf8.GetAddressOf());