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#include "core/slang-blob.h"
#include "gfx-test-util.h"
#include "slang-rhi.h"
#include "unit-test/slang-unit-test.h"
using namespace rhi;
namespace gfx_test
{
static void diagnoseIfNeeded(Slang::ComPtr<slang::IBlob>& diagnosticsBlob)
{
if (diagnosticsBlob && diagnosticsBlob->getBufferSize() > 0)
{
fprintf(stderr, "%s\n", (const char*)diagnosticsBlob->getBufferPointer());
}
}
static Slang::Result loadProgram(
rhi::IDevice* device,
Slang::ComPtr<rhi::IShaderProgram>& outShaderProgram,
slang::ProgramLayout*& slangReflection)
{
// main.slang: declares the interface, extern struct Inner, and Outer struct with Inner field
const char* mainSrc = R"(
// Define an interface
public interface IFoo
{
public float4 getFoo();
};
// Define an extern struct that implements the interface
public extern struct Inner : IFoo;
// Define a regular struct that contains an Inner field
public struct Outer
{
float2 position;
Inner innerData;
float2 texCoord;
};
// Vertex shader entry point that takes an Outer parameter
[shader("vertex")]
float4 vertexMain(Outer params) : SV_Position
{
return float4(params.position, 0.0f, 1.0f) + params.innerData.getFoo();
}
)";
// inner.slang: defines Inner with its field layout and its implementation of getFoo()
const char* innerSrc = R"(
import main;
// Define the implementation of Inner with its field layout
export public struct Inner : IFoo
{
public float4 getFoo() { return this.data; }
float4 data;
}
)";
Slang::ComPtr<slang::ISession> slangSession;
SLANG_RETURN_ON_FAIL(device->getSlangSession(slangSession.writeRef()));
Slang::ComPtr<slang::IBlob> diagnosticsBlob;
// Create blobs for the two modules
auto mainBlob = Slang::UnownedRawBlob::create(mainSrc, strlen(mainSrc));
auto innerBlob = Slang::UnownedRawBlob::create(innerSrc, strlen(innerSrc));
// Load modules from source
slang::IModule* mainModule = slangSession->loadModuleFromSource("main", "main.slang", mainBlob);
slang::IModule* innerModule =
slangSession->loadModuleFromSource("inner", "inner.slang", innerBlob);
// Find the entry point from main.slang
Slang::ComPtr<slang::IEntryPoint> vsEntryPoint;
SLANG_RETURN_ON_FAIL(mainModule->findEntryPointByName("vertexMain", vsEntryPoint.writeRef()));
// Compose the program from both modules and the entry point
Slang::List<slang::IComponentType*> componentTypes;
componentTypes.add(mainModule);
componentTypes.add(innerModule);
componentTypes.add(vsEntryPoint);
Slang::ComPtr<slang::IComponentType> composedProgram;
SLANG_RETURN_ON_FAIL(slangSession->createCompositeComponentType(
componentTypes.getBuffer(),
componentTypes.getCount(),
composedProgram.writeRef(),
diagnosticsBlob.writeRef()));
diagnoseIfNeeded(diagnosticsBlob);
// Link the composite program
Slang::ComPtr<slang::IComponentType> linkedProgram;
SLANG_RETURN_ON_FAIL(
composedProgram->link(linkedProgram.writeRef(), diagnosticsBlob.writeRef()));
diagnoseIfNeeded(diagnosticsBlob);
// Retrieve the reflection information
composedProgram = linkedProgram;
slangReflection = composedProgram->getLayout();
// Create a shader program
ShaderProgramDesc programDesc = {};
programDesc.slangGlobalScope = composedProgram.get();
auto shaderProgram = device->createShaderProgram(programDesc);
outShaderProgram = shaderProgram;
return SLANG_OK;
}
// Function to validate the type layout of Outer struct with nested Inner struct
static void validateNestedExternStructLayout(
UnitTestContext* context,
slang::ProgramLayout* slangReflection)
{
// Check reflection is available
SLANG_CHECK(slangReflection != nullptr);
// Get the entry point layout for vertexMain
slang::EntryPointLayout* entryPointLayout = slangReflection->findEntryPointByName("vertexMain");
SLANG_CHECK_MSG(entryPointLayout != nullptr, "Could not find vertexMain entry point");
// Get the parameter count for the entry point
auto paramCount = entryPointLayout->getParameterCount();
SLANG_CHECK_MSG(paramCount >= 1, "Entry point has no parameters");
// Get the first parameter, which should be of type Outer
auto paramLayout = entryPointLayout->getParameterByIndex(0);
SLANG_CHECK_MSG(paramLayout != nullptr, "Could not get first parameter layout");
// Get the type layout of the parameter
auto outerTypeLayout = paramLayout->getTypeLayout();
SLANG_CHECK_MSG(outerTypeLayout != nullptr, "Parameter has no type layout");
// Check if it's a struct type
auto kind = outerTypeLayout->getKind();
SLANG_CHECK_MSG(kind == slang::TypeReflection::Kind::Struct, "Parameter is not a struct type");
// Verify Outer has 3 fields: position, innerData, texCoord
auto fieldCount = outerTypeLayout->getFieldCount();
SLANG_CHECK_MSG(fieldCount == 3, "Outer struct does not have 3 fields");
// Find and check the innerData field
slang::VariableLayoutReflection* innerDataField = nullptr;
for (unsigned int i = 0; i < fieldCount; i++)
{
auto fieldLayout = outerTypeLayout->getFieldByIndex(i);
const char* fieldName = fieldLayout->getName();
if (fieldName && strcmp(fieldName, "innerData") == 0)
{
innerDataField = fieldLayout;
break;
}
}
SLANG_CHECK_MSG(innerDataField != nullptr, "Could not find innerData field in Outer struct");
// Get the type layout of the innerData field
auto innerTypeLayout = innerDataField->getTypeLayout();
SLANG_CHECK_MSG(innerTypeLayout != nullptr, "innerData field has no type layout");
// Verify Inner is a struct type
kind = innerTypeLayout->getKind();
SLANG_CHECK_MSG(kind == slang::TypeReflection::Kind::Struct, "Inner is not a struct type");
// Verify Inner has 1 field (data)
fieldCount = innerTypeLayout->getFieldCount();
SLANG_CHECK_MSG(fieldCount == 1, "Inner struct does not have 1 field");
// Find and check the data field in Inner
bool foundDataField = false;
for (unsigned int i = 0; i < fieldCount; i++)
{
auto fieldLayout = innerTypeLayout->getFieldByIndex(i);
const char* fieldName = fieldLayout->getName();
if (fieldName && strcmp(fieldName, "data") == 0)
{
foundDataField = true;
// Check that it's a float4 type
auto fieldTypeLayout = fieldLayout->getTypeLayout();
auto fieldTypeKind = fieldTypeLayout->getKind();
SLANG_CHECK_MSG(
fieldTypeKind == slang::TypeReflection::Kind::Vector,
"Field 'data' is not a vector type");
auto elementCount = fieldTypeLayout->getElementCount();
SLANG_CHECK_MSG(elementCount == 4, "Field 'data' is not a 4-element vector");
break;
}
}
SLANG_CHECK_MSG(foundDataField, "Could not find field 'data' in Inner struct");
}
void linkTimeTypeLayoutNestedImpl(rhi::IDevice* device, UnitTestContext* context)
{
Slang::ComPtr<rhi::IShaderProgram> shaderProgram;
slang::ProgramLayout* slangReflection = nullptr;
auto result = loadProgram(device, shaderProgram, slangReflection);
SLANG_CHECK(SLANG_SUCCEEDED(result));
// Validate the nested struct layout
validateNestedExternStructLayout(context, slangReflection);
// Create a graphics pipeline to verify everything works
RenderPipelineDesc pipelineDesc = {};
pipelineDesc.program = shaderProgram.get();
pipelineDesc.primitiveTopology = PrimitiveTopology::TriangleList;
ComPtr<IRenderPipeline> pipelineState;
auto pipelineResult = device->createRenderPipeline(pipelineDesc, pipelineState.writeRef());
SLANG_CHECK(SLANG_SUCCEEDED(pipelineResult));
}
//
// This test verifies that type layout information correctly propagates through
// the Slang compilation pipeline when a regular struct contains a field whose type
// is an extern struct defined in another module.
// Specifically, it tests that:
//
// 1. The Outer struct correctly includes the Inner extern struct as a field
// 2. After linking, the Inner struct's layout is properly resolved with its field
// 3. The complete type layout information is available in the reflection data
//
SLANG_UNIT_TEST(linkTimeTypeLayoutNested)
{
runTestImpl(linkTimeTypeLayoutNestedImpl, unitTestContext, DeviceType::Vulkan);
}
} // namespace gfx_test
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