path_fiddle/fiddle_context_d3d.cpp

#include "fiddle_context.hpp"

#include "rive/pls/pls_factory.hpp"
#include "rive/pls/pls_renderer.hpp"
#include "rive/pls/d3d/pls_render_context_d3d_impl.hpp"
#include "rive/pls/d3d/d3d11.hpp"
#include <array>
#include <dxgi1_2.h>

#define GLFW_INCLUDE_NONE
#define GLFW_EXPOSE_NATIVE_WIN32
#include "GLFW/glfw3.h"
#include <GLFW/glfw3native.h>

using namespace rive;
using namespace rive::pls;

class FiddleContextD3DPLS : public FiddleContext
{
public:
    FiddleContextD3DPLS(ComPtr<IDXGIFactory2> d3dFactory,
                        ComPtr<ID3D11Device> gpu,
                        ComPtr<ID3D11DeviceContext> gpuContext,
                        bool isIntel) :
        m_d3dFactory(std::move(d3dFactory)),
        m_gpu(std::move(gpu)),
        m_gpuContext(std::move(gpuContext)),
        m_plsContext(new PLSRenderContext(
            std::make_unique<PLSRenderContextD3DImpl>(m_gpu, m_gpuContext, isIntel)))
    {}

    float dpiScale() const override { return 1; }

    std::unique_ptr<Factory> makeFactory() override { return std::make_unique<PLSFactory>(); }

    void onSizeChanged(int width, int height) override
    {
        m_swapchain.Reset();

        DXGI_SWAP_CHAIN_DESC1 scd{};
        scd.Width = width;
        scd.Height = height;
        scd.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
        scd.SampleDesc.Count = 1;
        scd.BufferUsage = DXGI_USAGE_UNORDERED_ACCESS;
        scd.BufferCount = 2;
        scd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
        VERIFY_OK(m_d3dFactory->CreateSwapChainForHwnd(m_gpu.Get(),
                                                       glfwGetWin32Window(g_window),
                                                       &scd,
                                                       NULL,
                                                       NULL,
                                                       m_swapchain.GetAddressOf()));

        auto d3dContext = static_cast<PLSRenderContextD3DImpl*>(m_plsContext->impl());
        m_renderTarget = d3dContext->makeRenderTarget(width, height);
    }

    void toggleZoomWindow() override {}

    std::unique_ptr<Renderer> makeRenderer(int width, int height) override
    {
        return std::make_unique<PLSRenderer>(m_plsContext.get());
    }

    void begin() override
    {
        ComPtr<ID3D11Texture2D> backBuffer;
        VERIFY_OK(m_swapchain->GetBuffer(0,
                                         __uuidof(ID3D11Texture2D),
                                         reinterpret_cast<void**>(backBuffer.GetAddressOf())));
        m_renderTarget->setTargetTexture(m_gpu.Get(), std::move(backBuffer));

        PLSRenderContext::FrameDescriptor frameDescriptor;
        frameDescriptor.renderTarget = m_renderTarget;
        frameDescriptor.clearColor = 0xff404040;
        frameDescriptor.wireframe = g_wireframe;
        frameDescriptor.fillsDisabled = g_disableFill;
        frameDescriptor.strokesDisabled = g_disableStroke;
        m_plsContext->beginFrame(std::move(frameDescriptor));
    }

    void end() override
    {
        m_plsContext->flush();
        m_swapchain->Present(0, 0);
    }

    void shrinkGPUResourcesToFit() final { m_plsContext->shrinkGPUResourcesToFit(); }

private:
    ComPtr<IDXGIFactory2> m_d3dFactory;
    ComPtr<ID3D11Device> m_gpu;
    ComPtr<ID3D11DeviceContext> m_gpuContext;
    ComPtr<IDXGISwapChain1> m_swapchain;
    std::unique_ptr<PLSRenderContext> m_plsContext;
    rcp<PLSRenderTargetD3D> m_renderTarget;
};

std::unique_ptr<FiddleContext> FiddleContext::MakeD3DPLS()
{
    // Create a DXGIFactory object.
    ComPtr<IDXGIFactory2> factory;
    VERIFY_OK(CreateDXGIFactory(__uuidof(IDXGIFactory2),
                                reinterpret_cast<void**>(factory.GetAddressOf())));

    ComPtr<IDXGIAdapter> adapter;
    DXGI_ADAPTER_DESC adapterDesc{};
    bool isIntel = false;
    for (UINT i = 0; factory->EnumAdapters(i, &adapter) != DXGI_ERROR_NOT_FOUND; ++i)
    {
        adapter->GetDesc(&adapterDesc);
        isIntel = adapterDesc.VendorId == 0x163C || adapterDesc.VendorId == 0x8086 ||
                  adapterDesc.VendorId == 0x8087;
        if (isIntel == g_preferIntelGPU)
        {
            break;
        }
    }

    ComPtr<ID3D11Device> gpu;
    ComPtr<ID3D11DeviceContext> gpuContext;
    D3D_FEATURE_LEVEL featureLevels[] = {D3D_FEATURE_LEVEL_11_1};
    UINT creationFlags = 0;
#ifdef DEBUG
    creationFlags |= D3D11_CREATE_DEVICE_DEBUG;
#endif
    VERIFY_OK(D3D11CreateDevice(adapter.Get(),
                                D3D_DRIVER_TYPE_UNKNOWN,
                                NULL,
                                creationFlags,
                                featureLevels,
                                std::size(featureLevels),
                                D3D11_SDK_VERSION,
                                gpu.GetAddressOf(),
                                NULL,
                                gpuContext.GetAddressOf()));
    if (!gpu || !gpuContext)
    {
        return nullptr;
    }

    printf("D3D device: %S\n", adapterDesc.Description);

    return std::make_unique<FiddleContextD3DPLS>(std::move(factory),
                                                 std::move(gpu),
                                                 std::move(gpuContext),
                                                 isIntel);
}