WIP: Compute test running on CPU (#1023)

* * Simplify some of test code around CPPCompiler
* Test using 'callable' with pass-through
* Small cpu doc improvements

* Improvements to Clang output parsing.

* Remove temporary file (base filename) .

* Improve handling of external errors - handle severity.

* On error dumping out to 'actual' file for runCPPCompilerCompile.

* Small fixes.
Set the source language type correctly for pass thru.

* Remove warning for test for clang backend c

* Preliminary work around making render-test compute potentiall work with CPU.
Made ShaderCompiler -> a stateless ShaderCompilerUtil.
Means we don't require a Renderer interface to do shader compilation.

* Refactor such that CPU test can take place in without Window or Renderer.

* Hack to look for prelude in source file directory.
Fix bug returning the SharedLibrary for HostCallable.

* Compute test running on CPU.

* Need the prelude currently in same directly as test.

* Hack to remove warning - that then produces an error on appveyor build.
Disable running render CPU test on non-windows.

* Improve handling of disabling CPU tests on linux.

* Added bit-cast.slang working on CPU.

1 files changed, 15 insertions, 1 deletions

diff --git a/tools/slang-test/slang-test-main.cpp b/tools/slang-test/slang-test-main.cpp
index 4a830fd92..63e2456d9 100644
--- a/tools/slang-test/slang-test-main.cpp
+++ b/tools/slang-test/slang-test-main.cpp
@@ -690,6 +690,11 @@ static SlangResult _extractRenderTestRequirements(const CommandLine& cmdLine, Te
             nativeLanguage = SLANG_SOURCE_LANGUAGE_GLSL;
             passThru = SLANG_PASS_THROUGH_GLSLANG;
             break;
+        case RenderApiType::CPU:
+            target = SLANG_HOST_CALLABLE;
+            nativeLanguage = SLANG_SOURCE_LANGUAGE_CPP;
+            passThru = SLANG_PASS_THROUGH_GENERIC_C_CPP;
+            break;
     }
 
     SlangSourceLanguage sourceLanguage = nativeLanguage;
@@ -780,6 +785,15 @@ static RenderApiFlags _getAvailableRenderApiFlags(TestContext* context)
         {
             const RenderApiType apiType = RenderApiType(i);
 
+            if (apiType == RenderApiType::CPU)
+            {
+                // TODO(JS): Only enable CPU on Windows for now
+#if SLANG_WINDOWS_FAMILY
+                availableRenderApiFlags |= RenderApiFlags(1) << int(apiType);
+#endif
+                continue;
+            }
+
             // See if it's possible the api is available
             if (RenderApiUtil::calcHasApi(apiType))
             {
@@ -2656,7 +2670,7 @@ void runTestsOnFile(
     const RenderApiFlags availableRenderApiFlags = apiUsedFlags ? _getAvailableRenderApiFlags(context) : 0;
 
     // If synthesized tests are wanted look into adding them
-    if (context->options.synthesizedTestApis  && availableRenderApiFlags)
+    if (context->options.synthesizedTestApis && availableRenderApiFlags)
     {
         List<TestDetails> synthesizedTests;