Print SPIRV validation error message (#4697)

Closes #4692

This is a quick fix for the issue that SPIR-V validation error message
is not printed. A more proper way is to return the error messages to the
application and let the application handle it.

1 files changed, 23 insertions, 1 deletions

diff --git a/source/slang-glslang/slang-glslang.cpp b/source/slang-glslang/slang-glslang.cpp
index 8ae85b631..d29d22e89 100644
--- a/source/slang-glslang/slang-glslang.cpp
+++ b/source/slang-glslang/slang-glslang.cpp
@@ -145,6 +145,28 @@ struct SPIRVOptimizationDiagnostic
     std::string message;
 };
 
+// TODO: the actual printing should happen on the application side.
+static void validationMessageConsumer(spv_message_level_t level, const char*,
+    const spv_position_t& position, const char* message)
+{
+    switch (level)
+    {
+    case SPV_MSG_FATAL:
+    case SPV_MSG_INTERNAL_ERROR:
+    case SPV_MSG_ERROR:
+        std::cerr << "error: line " << position.index << ": " << message << std::endl;
+        break;
+    case SPV_MSG_WARNING:
+        std::cout << "warning: line " << position.index << ": " << message << std::endl;
+        break;
+    case SPV_MSG_INFO:
+        std::cout << "info: line " << position.index << ": " << message << std::endl;
+        break;
+    default:
+        break;
+    }
+}
+
 // Validate the given SPIRV-ASM instructions.
 extern "C"
 #ifdef _MSC_VER
@@ -160,7 +182,7 @@ bool glslang_validateSPIRV(const uint32_t* contents, int contentsSize)
     options.SetScalarBlockLayout(true);
 
     spvtools::SpirvTools tools(target_env);
-    //tools.SetMessageConsumer(spvtools::utils::CLIMessageConsumer);
+    tools.SetMessageConsumer(validationMessageConsumer);
 
     return tools.Validate(contents, contentsSize, options);
 }