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// unit-test-ptr-layout.cpp
#include "slang-com-ptr.h"
#include "slang.h"
#include "unit-test/slang-unit-test.h"
#include <stdlib.h>
using namespace Slang;
SLANG_UNIT_TEST(metalConstantBufferInParameterBlockLayout)
{
const char* testSource = R"(
struct T
{
float4 m0;
float m1;
float3 m2;
};
ParameterBlock<ConstantBuffer<T>> params;
)";
ComPtr<slang::IGlobalSession> globalSession;
SLANG_CHECK(slang_createGlobalSession(SLANG_API_VERSION, globalSession.writeRef()) == SLANG_OK);
slang::TargetDesc targetDesc = {};
targetDesc.format = SLANG_METAL;
targetDesc.profile = globalSession->findProfile("metal");
slang::SessionDesc sessionDesc = {};
sessionDesc.targetCount = 1;
sessionDesc.targets = &targetDesc;
ComPtr<slang::ISession> session;
SLANG_CHECK(globalSession->createSession(sessionDesc, session.writeRef()) == SLANG_OK);
ComPtr<slang::IBlob> diagnosticBlob;
auto module = session->loadModuleFromSourceString(
"test",
"test.slang",
testSource,
diagnosticBlob.writeRef());
SLANG_CHECK(module != nullptr);
auto testBody = [&]()
{
auto reflection = module->getLayout();
// Collect our layouts
auto paramBlockType = reflection->findTypeByName("ParameterBlock<ConstantBuffer<T>>");
SLANG_CHECK(paramBlockType != nullptr);
auto paramBlockLayout = reflection->getTypeLayout(paramBlockType);
SLANG_CHECK(paramBlockLayout != nullptr);
auto cbufferLayout = paramBlockLayout->getElementTypeLayout();
SLANG_CHECK(cbufferLayout != nullptr);
auto structLayout = cbufferLayout->getElementTypeLayout();
SLANG_CHECK(structLayout != nullptr);
// Check offsets follow constant buffer rules (uniform alignment)
// m0 : float4 should be at offset 0
// m1 : float should be at offset 16 (after float4)
// m2 : float3 should be at offset 32 (aligned to 16-byte boundary)
SLANG_CHECK(structLayout->getFieldCount() == 3);
SLANG_CHECK(structLayout->getFieldByIndex(0)->getOffset() == 0);
SLANG_CHECK(structLayout->getFieldByIndex(1)->getOffset() == 16);
SLANG_CHECK(structLayout->getFieldByIndex(2)->getOffset() == 32);
};
testBody();
}
SLANG_UNIT_TEST(metalArgumentBufferLayout)
{
const char* testSource = R"(
struct T
{
float4 m0;
float m1;
float3 m2;
};
// Using ParameterBlock directly without ConstantBuffer wrapper
ParameterBlock<T> params;
)";
ComPtr<slang::IGlobalSession> globalSession;
SLANG_CHECK(slang_createGlobalSession(SLANG_API_VERSION, globalSession.writeRef()) == SLANG_OK);
slang::TargetDesc targetDesc = {};
targetDesc.format = SLANG_METAL;
targetDesc.profile = globalSession->findProfile("metal");
slang::SessionDesc sessionDesc = {};
sessionDesc.targetCount = 1;
sessionDesc.targets = &targetDesc;
ComPtr<slang::ISession> session;
SLANG_CHECK(globalSession->createSession(sessionDesc, session.writeRef()) == SLANG_OK);
ComPtr<slang::IBlob> diagnosticBlob;
auto module = session->loadModuleFromSourceString(
"test",
"test.slang",
testSource,
diagnosticBlob.writeRef());
SLANG_CHECK(module != nullptr);
auto testBody = [&]()
{
auto reflection = module->getLayout();
// Collect our layouts
auto paramBlockType = reflection->findTypeByName("ParameterBlock<T>");
SLANG_CHECK(paramBlockType != nullptr);
auto paramBlockLayout = reflection->getTypeLayout(paramBlockType);
SLANG_CHECK(paramBlockLayout != nullptr);
auto structLayout = paramBlockLayout->getElementTypeLayout();
SLANG_CHECK(structLayout != nullptr);
// Check that offsets follow Metal argument buffer rules
// Fields should have 0 offset and meaningful binding indices
SLANG_CHECK(structLayout->getFieldCount() == 3);
SLANG_CHECK(structLayout->getFieldByIndex(0)->getOffset() == 0);
SLANG_CHECK(structLayout->getFieldByIndex(1)->getOffset() == 0);
SLANG_CHECK(structLayout->getFieldByIndex(2)->getOffset() == 0);
SLANG_CHECK(structLayout->getFieldByIndex(0)->getBindingIndex() == 0);
SLANG_CHECK(structLayout->getFieldByIndex(1)->getBindingIndex() == 1);
SLANG_CHECK(structLayout->getFieldByIndex(2)->getBindingIndex() == 2);
};
testBody();
}
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