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// metal-swap-chain.cpp
#include "metal-swap-chain.h"
#include "../apple/cocoa-util.h"
#include "metal-util.h"
namespace gfx
{
using namespace Slang;
namespace metal
{
ISwapchain* SwapchainImpl::getInterface(const Guid& guid)
{
if (guid == GfxGUID::IID_ISlangUnknown || guid == GfxGUID::IID_ISwapchain)
return static_cast<ISwapchain*>(this);
return nullptr;
}
void SwapchainImpl::getWindowSize(int& widthOut, int& heightOut) const
{
CocoaUtil::getNSWindowContentSize((void*)m_windowHandle.handleValues[0], &widthOut, &heightOut);
}
void SwapchainImpl::createImages()
{
m_images.setCount(m_desc.imageCount);
for (GfxCount i = 0; i < m_desc.imageCount; ++i)
{
ITextureResource::Desc imageDesc = {};
imageDesc.allowedStates = ResourceStateSet(
ResourceState::Present,
ResourceState::RenderTarget,
ResourceState::CopyDestination,
ResourceState::CopySource);
imageDesc.type = IResource::Type::Texture2D;
imageDesc.arraySize = 0;
imageDesc.format = m_desc.format;
imageDesc.size.width = m_desc.width;
imageDesc.size.height = m_desc.height;
imageDesc.size.depth = 1;
imageDesc.numMipLevels = 1;
imageDesc.defaultState = ResourceState::Present;
m_device->createTextureResource(
imageDesc,
nullptr,
(gfx::ITextureResource**)m_images[i].writeRef());
}
}
SwapchainImpl::~SwapchainImpl()
{
m_images.clear();
CocoaUtil::destroyMetalLayer(m_metalLayer);
}
Result SwapchainImpl::init(DeviceImpl* device, const ISwapchain::Desc& desc, WindowHandle window)
{
m_device = device;
m_desc = desc;
m_windowHandle = window;
m_metalFormat = MetalUtil::translatePixelFormat(desc.format);
m_currentImageIndex = -1;
getWindowSize(m_desc.width, m_desc.height);
m_metalLayer = (CA::MetalLayer*)CocoaUtil::createMetalLayer((void*)window.handleValues[0]);
if (!m_metalLayer)
{
return SLANG_FAIL;
}
m_metalLayer->setPixelFormat(m_metalFormat);
m_metalLayer->setDevice(m_device->m_device.get());
m_metalLayer->setDrawableSize(CGSize{(float)m_desc.width, (float)m_desc.height});
// We need to be able to copy from a texture.
m_metalLayer->setFramebufferOnly(false);
createImages();
return SLANG_OK;
}
Result SwapchainImpl::getImage(GfxIndex index, ITextureResource** outResource)
{
if (index < 0 || index >= m_desc.imageCount)
return SLANG_FAIL;
returnComPtr(outResource, m_images[index]);
return SLANG_OK;
}
Result SwapchainImpl::resize(GfxCount width, GfxCount height)
{
m_currentImageIndex = -1;
m_currentDrawable.reset();
getWindowSize(m_desc.width, m_desc.height);
m_metalLayer->setDrawableSize(CGSize{(float)m_desc.width, (float)m_desc.height});
createImages();
return SLANG_OK;
}
Result SwapchainImpl::present()
{
AUTORELEASEPOOL
if (!m_currentDrawable)
{
return SLANG_FAIL;
}
MTL::CommandBuffer* commandBuffer = m_device->m_commandQueue->commandBuffer();
MTL::BlitCommandEncoder* encoder = commandBuffer->blitCommandEncoder();
encoder->copyFromTexture(
m_images[m_currentImageIndex]->m_texture.get(),
m_currentDrawable->texture());
encoder->endEncoding();
commandBuffer->presentDrawable(m_currentDrawable.get());
commandBuffer->commit();
m_currentDrawable.reset();
return SLANG_OK;
// // TODO: Expose controls via some other means
// static uint32_t frameCount = 0;
// static uint32_t maxFrameCount = 32;
// ++frameCount;
// if (m_device->captureEnabled() && frameCount == maxFrameCount)
// {
// MTL::CaptureManager* captureManager = MTL::CaptureManager::sharedCaptureManager();
// captureManager->stopCapture();
// exit(1);
// }
// return SLANG_OK;
}
int SwapchainImpl::acquireNextImage()
{
AUTORELEASEPOOL
m_currentDrawable = NS::RetainPtr(m_metalLayer->nextDrawable());
if (m_currentDrawable)
{
m_currentImageIndex = (m_currentImageIndex + 1) % m_desc.imageCount;
}
else
{
m_currentImageIndex = -1;
}
return m_currentImageIndex;
}
Result SwapchainImpl::setFullScreenMode(bool mode)
{
return SLANG_E_NOT_AVAILABLE;
}
} // namespace metal
} // namespace gfx
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