Add bgra8 format (#6163)

* add brga8 format

* add tests

* minor fixes

* cleanup

* maybe fix broken quad control test

* add missing xslang flag on test

---------

Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/source/slang/slang-emit-wgsl.cpp b/source/slang/slang-emit-wgsl.cpp
index 30a7af938..ce60cc2a0 100644
--- a/source/slang/slang-emit-wgsl.cpp
+++ b/source/slang/slang-emit-wgsl.cpp
@@ -326,7 +326,7 @@ void WGSLSourceEmitter::emit(const AddressSpace addressSpace)
     }
 }
 
-static const char* getWgslImageFormat(IRTextureTypeBase* type)
+const char* WGSLSourceEmitter::getWgslImageFormat(IRTextureTypeBase* type)
 {
     // You can find the supported WGSL texel format from the URL:
     // https://www.w3.org/TR/WGSL/#storage-texel-formats
@@ -405,11 +405,19 @@ static const char* getWgslImageFormat(IRTextureTypeBase* type)
         return "rgba32sint";
     case ImageFormat::rgba32f:
         return "rgba32float";
+    case ImageFormat::bgra8:
+        return "bgra8unorm";
     case ImageFormat::unknown:
         // Unlike SPIR-V, WGSL doesn't have a texel format for "unknown".
         return "rgba32float";
     default:
-        // We may need to print a warning for types WGSL doesn't support
+        const auto imageFormatInfo = getImageFormatInfo(imageFormat);
+        getSink()->diagnose(
+            SourceLoc(),
+            Diagnostics::imageFormatUnsupportedByBackend,
+            imageFormatInfo.name,
+            "WGSL",
+            "rgba32float");
         return "rgba32float";
     }
 }