Generate Visual Studio projects using Premake (#557)

* Generate Visual Studio projects using Premake

This change adds a `premake5.lua` file that allows us to generate our Visual Studio solution using Premake 5 (https://premake.github.io/).
The existing Visual Studio solution/projects are now replaced with the Premake-generated ones, and project contributors will be expected to update these by running premake after adding/removing files.

I have *not* changed the Linux `Makefile` build at all, because that file is also used for things like running our tests, so that clobbering it with a premake-generated `Makefile` would break our continuous testing.
Hopefully future changes can switch to a generated `Makefile` and perhaps even add an XCode project as well.

Notes:

* The `build/slang-build.props` file is no longer needed/used, so it has been removed.

* The `slang-eval-test` test fixture wasn't following our naming conventions for its directory path, so it was updated to streamline the Premake build configuration work. This required changes to the `Makefile` as well

* Some seemingly unncessary preprocessor definitions that were specified for `core` and `slang-glslang` have been dropped. We will see if anything breaks from that.

* Possible fixup for Premake vpath issue

Premake's `vpath` feature seems to be nondeterministic about the order it applies filters (because Lua isn't deterministic about the order of entries in a key/value table), and as a result we can end up in a weird case where it decides that a `foo.cpp.h` file matches the `**.cpp` filter (I'm not sure why) before it tests against the `**.h` filter.

This change uses an (undocumented) Premake facility to set `vpath` using a list of singleton tables, which seems to fix the order in which things get tested.

* Remove support for "single-file" build of Slang

The `hello` example was the only bit of code that uses the "single-file" way of building Slang, and this had already run up against limitations of the Visual Studio compilers in its Debug|x64 build.
Rather than mess with Premake to make it pass through the `/bigobj` linker flag that is needed to work around the issue, it makes more sense just to stop using/supporting the feature since we wouldn't want users to depend on it anyway (our documentation no longer refers to it).

While I was at it I went ahead and made sure that the `SLANG_DYNAMIC` flag doesn't need to be set manually, so that instead there is a non-default `SLANG_STATIC` option (not that we have a static-library build of Slang at the moment).

1 files changed, 133 insertions, 0 deletions

diff --git a/tools/slang-eval-test/main.cpp b/tools/slang-eval-test/main.cpp
new file mode 100644
index 000000000..e01d4441b
--- /dev/null
+++ b/tools/slang-eval-test/main.cpp
@@ -0,0 +1,133 @@
+// main.cpp
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "../../source/core/secure-crt.h"
+#include <slang.h>
+
+int main(
+    int argc,
+    char** argv)
+{
+    // TODO: parse arguments
+
+    assert(argc >= 2);
+    char const* inputPath = argv[1];
+
+    // Slurp in the input file, so that we can compile and run it
+    FILE* inputFile;
+    fopen_s(&inputFile, inputPath, "rb");
+    assert(inputFile);
+
+    fseek(inputFile, 0, SEEK_END);
+    size_t inputSize = ftell(inputFile);
+    fseek(inputFile, 0, SEEK_SET);
+
+    char* inputText = (char*) malloc(inputSize + 1);
+    fread(inputText, inputSize, 1, inputFile);
+    inputText[inputSize] = 0;
+    fclose(inputFile);
+
+    // TODO: scan through the text to find comments,
+    // that instruct us how to generate input and
+    // consume output when running the test.
+
+    //
+
+    SlangSession* session = spCreateSession(nullptr);
+    SlangCompileRequest* request = spCreateCompileRequest(session);
+
+    spSetOutputContainerFormat(
+        request,
+        SLANG_CONTAINER_FORMAT_SLANG_MODULE);
+
+    int translationUnitIndex = spAddTranslationUnit(
+        request,
+        SLANG_SOURCE_LANGUAGE_SLANG,
+        nullptr);
+
+    spAddTranslationUnitSourceString(
+        request,
+        translationUnitIndex,
+        inputPath,
+        inputText);
+
+    int entryPointIndex = spAddEntryPoint(
+        request,
+        translationUnitIndex,
+        "main",
+        spFindProfile(session, "cs_5_0"));
+
+    if( spCompile(request) != 0 )
+    {
+        char const* output = spGetDiagnosticOutput(request);
+        fputs(output, stderr);
+        exit(1);
+    }
+
+    // Things compiled, so now we need to run them...
+
+    // Extract the bytecode
+    size_t bytecodeSize = 0;
+    void const* bytecode = spGetCompileRequestCode(request, &bytecodeSize);
+
+    // Now we need to create an execution context to go and run the bytecode we got
+
+    SlangVM* vm = SlangVM_create();
+
+    SlangVMModule* vmModule = SlangVMModule_load(
+        vm,
+        bytecode,
+        bytecodeSize);
+
+    SlangVMFunc* vmFunc = (SlangVMFunc*)SlangVMModule_findGlobalSymbolPtr(
+        vmModule,
+        "main");
+
+    int32_t*& inputArg = *(int32_t**)SlangVMModule_findGlobalSymbolPtr(
+        vmModule,
+        "input");
+
+    int32_t*& outputArg = *(int32_t**)SlangVMModule_findGlobalSymbolPtr(
+        vmModule,
+        "output");
+
+    SlangVMThread* vmThread = SlangVMThread_create(
+        vm);
+
+    int32_t inputData[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
+    int32_t outputData[8] = { 0 };
+
+    inputArg = inputData;
+    outputArg = outputData;
+
+    // TODO: set arguments based on specification from the user...
+    for (uint32_t threadID = 0; threadID < 8; ++threadID)
+    {
+#if 0
+        fprintf(stderr, "\n\nthreadID = %u\n\n", threadID);
+        fflush(stderr);
+#endif
+
+        SlangVMThread_beginCall(vmThread, vmFunc);
+
+        SlangVMThread_setArg(
+            vmThread,
+            0,
+            &threadID,
+            sizeof(threadID));
+
+        SlangVMThread_resume(vmThread);
+    }
+
+    for (uint32_t ii = 0; ii < 8; ++ii)
+    {
+        fprintf(stdout, "outputData[%u] = %d\n", ii, outputData[ii]);
+    }
+
+    spDestroyCompileRequest(request);
+    spDestroySession(session);
+
+    return 0;
+}