Running tests in slang-test process (#740)

* First pass at having an interface to write text to that can be replaced.
Simplifed and made more rigerous the interface used to write formatted strings.

* Added AppContext to simplify setting up and parsing around of streams.

* Added more simplified way to get the std error/out from AppContext.

* Work in progress using dll for tools to speed up testing.

* First pass at ISlangWriter interface.

* Added support for writing VaArgs.
Added NullWriter.

* Use ISlangWriter for output.

* Use ISlangWriter for output - replacing OutputCallback.
Make IRDump go to ISlangWriter

* SlangWriterTargetType -> SlangWriterChannel
Improvements around AppContext

* Shared library working with slang-reflection-test.

* Dll testing working for render-test.

* Include va_list definintion from header.

* Fix errors from clang.

* Fix typo for linux.

* Added -usexes option

* Fix typo.

* Fix arguments problem on linux.

* Fix typo for linux.

* Add windows tool shared library projects.

* Fix warning from x86 win build.
Fix signed warning from slang-test/main.cpp

* First attempt at getting premake to work on travis, and run tests.

* Try moving build out into script.

* Invoke bash scripts so they don't have to be executable.

* Drive configuration/tests from env parameters set by travis

* Try using source to run travis tests.

* Remove the build.linux directory - but doing so will overwrite Makefile.

* Made -fno-delete-null-pointer-checks gcc only.

* Try to fix warning from -fno-delete-null-pointer-checks

* Turn of warnings for unknown switches.

* Try to make premake choose the correct tooling.

* Disabled missing braces warning.

* Disable -Wundefined-var-template on clang.

* -Wunused-function disabled for clang.

* Fix typo due to SlangBool.

* Remove this nullptr tests.

* "-Wno-unused-private-field" for clang.

* Added "-Wno-undefined-bool-conversion"

* Add DominatorList::end fix.

* Split scripts into travis_build.sh travis_test.sh

* Fix gcc/clang template pre-declaration issue around QualType.

* Fix premake to build such that pthread correctly links with slang-glslang

1 files changed, 61 insertions, 4 deletions

diff --git a/source/slang/slang.cpp b/source/slang/slang.cpp
index 8fe08884e..b0adb2025 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -13,6 +13,7 @@
 #include "../slang/type-layout.h"
 
 #include "slang-file-system.h"
+#include "../core/slang-writer.h"
 
 #include "ir-serialize.h"
 
@@ -305,6 +306,12 @@ CompileRequest::CompileRequest(Session* session)
 
     sourceManager->initialize(session->getBuiltinSourceManager());
 
+    // Set all the default writers
+    for (int i = 0; i < int(WriterChannel::CountOf); ++i)
+    {
+        setWriter(WriterChannel(i), nullptr);
+    }
+
     // Set up the default file system
     SLANG_ASSERT(fileSystem == nullptr);
     fileSystemExt = new CacheFileSystem(DefaultFileSystem::getSingleton());
@@ -368,9 +375,38 @@ MatrixLayoutMode TargetRequest::getDefaultMatrixLayoutMode()
 }
 
 
-
 //
 
+static ISlangWriter* _getDefaultWriter(WriterChannel chan)
+{
+    static FileWriter stdOut(stdout, WriterFlag::IsStatic | WriterFlag::IsUnowned);
+    static FileWriter stdError(stderr, WriterFlag::IsStatic | WriterFlag::IsUnowned);
+    static NullWriter nullWriter(WriterFlag::IsStatic | WriterFlag::IsConsole);
+
+    switch (chan)
+    {
+        case WriterChannel::StdError:    return &stdError;
+        case WriterChannel::StdOutput:   return &stdOut;
+        case WriterChannel::Diagnostic:  return &nullWriter;
+        default:
+        {
+            SLANG_ASSERT(!"Unknown type");
+            return &stdError;
+        }
+    }
+}
+
+void CompileRequest::setWriter(WriterChannel chan, ISlangWriter* writer)
+{
+    writer = writer ? writer : _getDefaultWriter(chan);
+    m_writers[int(chan)] = writer;
+
+    if (chan == WriterChannel::Diagnostic)
+    {
+        mSink.writer = writer;
+    }
+}
+
 SlangResult CompileRequest::loadFile(String const& path, ISlangBlob** outBlob)
 {
     return fileSystemExt->loadFile(path.Buffer(), outBlob);
@@ -1205,7 +1241,6 @@ SLANG_API void spSetFileSystem(
     }
 }
 
-
 SLANG_API void spSetCompileFlags(
     SlangCompileRequest*    request,
     SlangCompileFlags       flags)
@@ -1319,11 +1354,33 @@ SLANG_API void spSetDiagnosticCallback(
     SlangDiagnosticCallback callback,
     void const*             userData)
 {
+    using namespace Slang;
+
     if(!request) return;
     auto req = REQ(request);
 
-    req->mSink.callback = callback;
-    req->mSink.callbackUserData = (void*) userData;
+    ComPtr<ISlangWriter> writer(new CallbackWriter(callback, userData, WriterFlag::IsConsole));
+    req->setWriter(WriterChannel::Diagnostic, writer);
+}
+
+SLANG_API void spSetWriter(
+    SlangCompileRequest*    request,
+    SlangWriterChannel      chan, 
+    ISlangWriter*           writer)
+{
+    if (!request) return;
+    auto req = REQ(request);
+
+    req->setWriter(Slang::WriterChannel(chan), writer);
+}
+
+SLANG_API ISlangWriter* spGetWriter(
+    SlangCompileRequest*    request,
+    SlangWriterChannel      chan)
+{
+    if (!request) return nullptr;
+    auto req = REQ(request);
+    return req->getWriter(Slang::WriterChannel(chan));
 }
 
 SLANG_API void spAddSearchPath(