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// main.cpp
#include "slang-com-helper.h"
#include "slang-com-ptr.h"
#include "slang.h"
#include <stdio.h>
// This includes a useful small function for setting up the prelude (described more further below).
#include "../../source/core/slang-test-tool-util.h"
#include "examples/example-base/example-base.h"
// Slang namespace is used for elements support code (like core) which we use here
// for ComPtr<> and TestToolUtil
using namespace Slang;
static const ExampleResources resourceBase("cpu-com-example");
// For the moment we have to explicitly write the Slang COM interface in C++ code. It *MUST* match
// the interface in the slang source
// As it stands all interfaces need to derive from ISlangUnknown (or IUnknown).
class IDoThings : public ISlangUnknown
{
public:
virtual SLANG_NO_THROW int SLANG_MCALL doThing(int a, int b) = 0;
virtual SLANG_NO_THROW int SLANG_MCALL calcHash(const char* in) = 0;
virtual SLANG_NO_THROW void SLANG_MCALL printMessage(const char* in) = 0;
};
static int _calcHash(const char* in)
{
int hash = 0;
for (; *in; ++in)
{
// A very poor hash function
hash = hash * 13 + *in;
}
return hash;
}
class DoThings : public IDoThings
{
public:
// We don't need queryInterface for this impl, or ref counting
virtual SLANG_NO_THROW SlangResult SLANG_MCALL
queryInterface(SlangUUID const& uuid, void** outObject) SLANG_OVERRIDE
{
return SLANG_E_NOT_IMPLEMENTED;
}
virtual SLANG_NO_THROW uint32_t SLANG_MCALL addRef() SLANG_OVERRIDE { return 1; }
virtual SLANG_NO_THROW uint32_t SLANG_MCALL release() SLANG_OVERRIDE { return 1; }
// IDoThings
virtual SLANG_NO_THROW int SLANG_MCALL doThing(int a, int b) SLANG_OVERRIDE
{
return a + b + 1;
}
virtual SLANG_NO_THROW int SLANG_MCALL calcHash(const char* in) SLANG_OVERRIDE
{
return (int)_calcHash(in);
}
virtual SLANG_NO_THROW void SLANG_MCALL printMessage(const char* in) SLANG_OVERRIDE
{
printf("%s\n", in);
}
};
static SlangResult _innerMain(int argc, char** argv)
{
// NOTE! This example only works if `slang-llvm` or a C++ compiler that Slang supports is
// available.
// Create the session
ComPtr<slang::IGlobalSession> slangSession;
slangSession.attach(spCreateSession(NULL));
// Set up the prelude
// NOTE: This isn't strictly necessary, as preludes are embedded in the binary.
TestToolUtil::setSessionDefaultPreludeFromExePath(argv[0], slangSession);
// Create a compile request
Slang::ComPtr<slang::ICompileRequest> request;
SLANG_ALLOW_DEPRECATED_BEGIN
SLANG_RETURN_ON_FAIL(slangSession->createCompileRequest(request.writeRef()));
SLANG_ALLOW_DEPRECATED_END
// We want to compile to 'HOST_CALLABLE' here such that we can execute the Slang code.
//
// Note that it is possible to use HOST_HOST_CALLABLE, but this currently only works with
// 'regular' C++ compilers not with `slang-llvm`.
const int targetIndex = request->addCodeGenTarget(SLANG_SHADER_HOST_CALLABLE);
// Set the target flag to indicate that we want to compile all into a library.
request->setTargetFlags(targetIndex, SLANG_TARGET_FLAG_GENERATE_WHOLE_PROGRAM);
// Add the translation unit
const int translationUnitIndex =
request->addTranslationUnit(SLANG_SOURCE_LANGUAGE_SLANG, nullptr);
// Set the source file for the translation unit
Slang::String path = resourceBase.resolveResource("shader.slang");
request->addTranslationUnitSourceFile(translationUnitIndex, path.getBuffer());
const SlangResult compileRes = request->compile();
// Even if there were no errors that forced compilation to fail, the
// compiler may have produced "diagnostic" output such as warnings.
// We will go ahead and print that output here.
//
if (auto diagnostics = request->getDiagnosticOutput())
{
printf("%s", diagnostics);
}
// Get the 'shared library' (note that this doesn't necessarily have to be implemented as a
// shared library it's just an interface to executable code).
ComPtr<ISlangSharedLibrary> sharedLibrary;
SLANG_RETURN_ON_FAIL(request->getTargetHostCallable(0, sharedLibrary.writeRef()));
DoThings doThings;
{
auto doThingsPtr = (IDoThings**)sharedLibrary->findSymbolAddressByName("globalDoThings");
if (!doThingsPtr)
{
return SLANG_FAIL;
}
// Set the global interface
*doThingsPtr = &doThings;
}
// Test a free function
{
typedef const char* (*Func)(const char*);
Func func = (Func)sharedLibrary->findFuncByName("getString");
if (!func)
{
return SLANG_FAIL;
}
String text = "Hello World!";
String returnedText = func(text.getBuffer());
SLANG_ASSERT(text == returnedText);
}
// Test hash
{
typedef int (*Func)(const char* text);
Func func = (Func)sharedLibrary->findFuncByName("calcHash");
if (!func)
{
return SLANG_FAIL;
}
String text("Hello");
const int hash = func(text.getBuffer());
SLANG_ASSERT(hash == _calcHash(text.getBuffer()));
}
// Test printing
{
typedef void (*Func)(const char* text);
Func func = (Func)sharedLibrary->findFuncByName("printMessage");
if (!func)
{
return SLANG_FAIL;
}
func("Hello World!");
}
return SLANG_OK;
}
int exampleMain(int argc, char** argv)
{
return SLANG_SUCCEEDED(_innerMain(argc, argv)) ? 0 : -1;
}
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