vo_gpu: d3d11: implement tex_download()

This allows the new GPU screenshot functionality introduced in
9f595f3a80ee to work with the D3D11 backend. It replaces the old window
screenshot functionality, which was shared between D3D11 and ANGLE. The
old code can be removed, since it's not needed by ANGLE anymore either.

2 files changed, 0 insertions, 83 deletions

diff --git a/video/out/gpu/d3d11_helpers.c b/video/out/gpu/d3d11_helpers.c
index 7bdd3c2eaa..d267ac3009 100644
--- a/video/out/gpu/d3d11_helpers.c
+++ b/video/out/gpu/d3d11_helpers.c
@@ -374,84 +374,3 @@ done:
     SAFE_RELEASE(dxgi_dev);
     return success;
 }
-
-struct mp_image *mp_d3d11_screenshot(IDXGISwapChain *swapchain)
-{
-    ID3D11Device *dev = NULL;
-    ID3D11DeviceContext *ctx = NULL;
-    ID3D11Texture2D *frontbuffer = NULL;
-    ID3D11Texture2D *staging = NULL;
-    struct mp_image *img = NULL;
-    HRESULT hr;
-
-    // Validate the swap chain. This screenshot method will only work on DXGI
-    // 1.2+ flip/sequential swap chains. It's probably not possible at all with
-    // discard swap chains, since by definition, the backbuffer contents is
-    // discarded on Present().
-    DXGI_SWAP_CHAIN_DESC scd;
-    hr = IDXGISwapChain_GetDesc(swapchain, &scd);
-    if (FAILED(hr))
-        goto done;
-    if (scd.SwapEffect != DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL)
-        goto done;
-
-    // Get the last buffer that was presented with Present(). This should be
-    // the n-1th buffer for a swap chain of length n.
-    hr = IDXGISwapChain_GetBuffer(swapchain, scd.BufferCount - 1,
-        &IID_ID3D11Texture2D, (void**)&frontbuffer);
-    if (FAILED(hr))
-        goto done;
-
-    ID3D11Texture2D_GetDevice(frontbuffer, &dev);
-    ID3D11Device_GetImmediateContext(dev, &ctx);
-
-    D3D11_TEXTURE2D_DESC td;
-    ID3D11Texture2D_GetDesc(frontbuffer, &td);
-    if (td.SampleDesc.Count > 1)
-        goto done;
-
-    // Validate the backbuffer format and convert to an mpv IMGFMT
-    enum mp_imgfmt fmt;
-    switch (td.Format) {
-    case DXGI_FORMAT_B8G8R8A8_UNORM: fmt = IMGFMT_BGR0; break;
-    case DXGI_FORMAT_R8G8B8A8_UNORM: fmt = IMGFMT_RGB0; break;
-    default:
-        goto done;
-    }
-
-    // Create a staging texture based on the frontbuffer with CPU access
-    td.BindFlags = 0;
-    td.MiscFlags = 0;
-    td.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
-    td.Usage = D3D11_USAGE_STAGING;
-    hr = ID3D11Device_CreateTexture2D(dev, &td, 0, &staging);
-    if (FAILED(hr))
-        goto done;
-
-    ID3D11DeviceContext_CopyResource(ctx, (ID3D11Resource*)staging,
-        (ID3D11Resource*)frontbuffer);
-
-    // Attempt to map the staging texture to CPU-accessible memory
-    D3D11_MAPPED_SUBRESOURCE lock;
-    hr = ID3D11DeviceContext_Map(ctx, (ID3D11Resource*)staging, 0,
-                                 D3D11_MAP_READ, 0, &lock);
-    if (FAILED(hr))
-        goto done;
-
-    img = mp_image_alloc(fmt, td.Width, td.Height);
-    if (!img)
-        return NULL;
-    for (int i = 0; i < td.Height; i++) {
-        memcpy(img->planes[0] + img->stride[0] * i,
-               (char*)lock.pData + lock.RowPitch * i, td.Width * 4);
-    }
-
-    ID3D11DeviceContext_Unmap(ctx, (ID3D11Resource*)staging, 0);
-
-done:
-    SAFE_RELEASE(frontbuffer);
-    SAFE_RELEASE(staging);
-    SAFE_RELEASE(ctx);
-    SAFE_RELEASE(dev);
-    return img;
-}
diff --git a/video/out/gpu/d3d11_helpers.h b/video/out/gpu/d3d11_helpers.h
index 481c183b4d..996b93494f 100644
--- a/video/out/gpu/d3d11_helpers.h
+++ b/video/out/gpu/d3d11_helpers.h
@@ -78,6 +78,4 @@ bool mp_d3d11_create_swapchain(ID3D11Device *dev, struct mp_log *log,
                                struct d3d11_swapchain_opts *opts,
                                IDXGISwapChain **swapchain_out);
 
-struct mp_image *mp_d3d11_screenshot(IDXGISwapChain *swapchain);
-
 #endif