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#include "example-base.h"
#include <chrono>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#endif
using namespace Slang;
using namespace gfx;
Slang::Result WindowedAppBase::initializeBase(const char* title, int width, int height)
{
// Create a window for our application to render into.
//
platform::WindowDesc windowDesc;
windowDesc.title = title;
windowDesc.width = width;
windowDesc.height = height;
windowWidth = width;
windowHeight = height;
windowDesc.style = platform::WindowStyle::Default;
gWindow = platform::Application::createWindow(windowDesc);
gWindow->events.mainLoop = [this]() { mainLoop(); };
gWindow->events.sizeChanged = Slang::Action<>(this, &WindowedAppBase::windowSizeChanged);
// Initialize the rendering layer.
IDevice::Desc deviceDesc = {};
// deviceDesc.slang.targetFlags = SLANG_TARGET_FLAG_DUMP_IR;
gfx::Result res = gfxCreateDevice(&deviceDesc, gDevice.writeRef());
if (SLANG_FAILED(res))
return res;
auto deviceInfo = gDevice->getDeviceInfo();
Slang::StringBuilder titleSb;
titleSb << title << " (" << deviceInfo.apiName << ": " << deviceInfo.adapterName << ")";
gWindow->setText(titleSb.getBuffer());
ICommandQueue::Desc queueDesc = {};
queueDesc.type = ICommandQueue::QueueType::Graphics;
gQueue = gDevice->createCommandQueue(queueDesc);
// Create swapchain and framebuffers.
gfx::ISwapchain::Desc swapchainDesc = {};
swapchainDesc.format = gfx::Format::RGBA_Unorm_UInt8;
swapchainDesc.width = width;
swapchainDesc.height = height;
swapchainDesc.imageCount = kSwapchainImageCount;
swapchainDesc.queue = gQueue;
gfx::WindowHandle windowHandle = gWindow->getNativeHandle().convert<gfx::WindowHandle>();
gSwapchain = gDevice->createSwapchain(swapchainDesc, windowHandle);
IFramebufferLayout::AttachmentLayout renderTargetLayout = {gSwapchain->getDesc().format, 1};
IFramebufferLayout::AttachmentLayout depthLayout = {gfx::Format::D_Float32, 1};
IFramebufferLayout::Desc framebufferLayoutDesc;
framebufferLayoutDesc.renderTargetCount = 1;
framebufferLayoutDesc.renderTargets = &renderTargetLayout;
framebufferLayoutDesc.depthStencil = &depthLayout;
SLANG_RETURN_ON_FAIL(
gDevice->createFramebufferLayout(framebufferLayoutDesc, gFramebufferLayout.writeRef()));
createSwapchainFramebuffers();
for (uint32_t i = 0; i < kSwapchainImageCount; i++)
{
gfx::ITransientResourceHeap::Desc transientHeapDesc;
transientHeapDesc.constantBufferSize = 4096 * 1024;
auto transientHeap = gDevice->createTransientResourceHeap(transientHeapDesc);
gTransientHeaps.add(transientHeap);
}
gfx::IRenderPassLayout::Desc renderPassDesc = {};
renderPassDesc.framebufferLayout = gFramebufferLayout;
renderPassDesc.renderTargetCount = 1;
IRenderPassLayout::AttachmentAccessDesc renderTargetAccess = {};
IRenderPassLayout::AttachmentAccessDesc depthStencilAccess = {};
renderTargetAccess.loadOp = IRenderPassLayout::AttachmentLoadOp::Clear;
renderTargetAccess.storeOp = IRenderPassLayout::AttachmentStoreOp::Store;
renderTargetAccess.initialState = ResourceState::Undefined;
renderTargetAccess.finalState = ResourceState::Present;
depthStencilAccess.loadOp = IRenderPassLayout::AttachmentLoadOp::Clear;
depthStencilAccess.storeOp = IRenderPassLayout::AttachmentStoreOp::Store;
depthStencilAccess.initialState = ResourceState::Undefined;
depthStencilAccess.finalState = ResourceState::DepthWrite;
renderPassDesc.renderTargetAccess = &renderTargetAccess;
renderPassDesc.depthStencilAccess = &depthStencilAccess;
gRenderPass = gDevice->createRenderPassLayout(renderPassDesc);
return SLANG_OK;
}
void WindowedAppBase::mainLoop()
{
int frameBufferIndex = gSwapchain->acquireNextImage();
if (frameBufferIndex == -1)
return;
gTransientHeaps[frameBufferIndex]->synchronizeAndReset();
renderFrame(frameBufferIndex);
}
void WindowedAppBase::createSwapchainFramebuffers()
{
gFramebuffers.clear();
for (uint32_t i = 0; i < kSwapchainImageCount; i++)
{
gfx::ITextureResource::Desc depthBufferDesc;
depthBufferDesc.type = IResource::Type::Texture2D;
depthBufferDesc.size.width = gSwapchain->getDesc().width;
depthBufferDesc.size.height = gSwapchain->getDesc().height;
depthBufferDesc.size.depth = 1;
depthBufferDesc.format = gfx::Format::D_Float32;
depthBufferDesc.defaultState = ResourceState::DepthWrite;
depthBufferDesc.allowedStates = ResourceStateSet(ResourceState::DepthWrite);
ComPtr<gfx::ITextureResource> depthBufferResource =
gDevice->createTextureResource(depthBufferDesc, nullptr);
ComPtr<gfx::ITextureResource> colorBuffer;
gSwapchain->getImage(i, colorBuffer.writeRef());
gfx::IResourceView::Desc colorBufferViewDesc;
memset(&colorBufferViewDesc, 0, sizeof(colorBufferViewDesc));
colorBufferViewDesc.format = gSwapchain->getDesc().format;
colorBufferViewDesc.renderTarget.shape = gfx::IResource::Type::Texture2D;
colorBufferViewDesc.type = gfx::IResourceView::Type::RenderTarget;
ComPtr<gfx::IResourceView> rtv =
gDevice->createTextureView(colorBuffer.get(), colorBufferViewDesc);
gfx::IResourceView::Desc depthBufferViewDesc;
memset(&depthBufferViewDesc, 0, sizeof(depthBufferViewDesc));
depthBufferViewDesc.format = gfx::Format::D_Float32;
depthBufferViewDesc.renderTarget.shape = gfx::IResource::Type::Texture2D;
depthBufferViewDesc.type = gfx::IResourceView::Type::DepthStencil;
ComPtr<gfx::IResourceView> dsv =
gDevice->createTextureView(depthBufferResource.get(), depthBufferViewDesc);
gfx::IFramebuffer::Desc framebufferDesc;
framebufferDesc.renderTargetCount = 1;
framebufferDesc.depthStencilView = dsv.get();
framebufferDesc.renderTargetViews = rtv.readRef();
framebufferDesc.layout = gFramebufferLayout;
ComPtr<gfx::IFramebuffer> frameBuffer = gDevice->createFramebuffer(framebufferDesc);
gFramebuffers.add(frameBuffer);
}
}
void WindowedAppBase::windowSizeChanged()
{
// Wait for the GPU to finish.
gQueue->wait();
auto clientRect = gWindow->getClientRect();
if (clientRect.width > 0 && clientRect.height > 0)
{
// Free all framebuffers before resizing swapchain.
gFramebuffers = decltype(gFramebuffers)();
// Resize swapchain.
if (gSwapchain->resize(clientRect.width, clientRect.height) == SLANG_OK)
{
// Recreate framebuffers for each swapchain back buffer image.
createSwapchainFramebuffers();
windowWidth = clientRect.width;
windowHeight = clientRect.height;
}
}
}
int64_t getCurrentTime() { return std::chrono::high_resolution_clock::now().time_since_epoch().count(); }
int64_t getTimerFrequency() { return std::chrono::high_resolution_clock::period::den; }
#ifdef _WIN32
void _Win32OutputDebugString(const char* str) { OutputDebugStringW(Slang::String(str).toWString().begin()); }
#endif
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