WinRT: better rendering performance via D3D11_USAGE_DYNAMIC
diff --git a/src/render/direct3d11/SDL_render_d3d11.cpp b/src/render/direct3d11/SDL_render_d3d11.cpp
index 6852af8..37e355d 100644
--- a/src/render/direct3d11/SDL_render_d3d11.cpp
+++ b/src/render/direct3d11/SDL_render_d3d11.cpp
@@ -1384,7 +1384,7 @@ D3D11_RenderClear(SDL_Renderer * renderer)
static int
D3D11_UpdateVertexBuffer(SDL_Renderer *renderer,
- const void * vertexData, unsigned int dataSizeInBytes)
+ const void * vertexData, size_t dataSizeInBytes)
{
D3D11_RenderData *rendererData = (D3D11_RenderData *) renderer->driverdata;
HRESULT result = S_OK;
@@ -1397,10 +1397,20 @@ D3D11_UpdateVertexBuffer(SDL_Renderer *renderer,
}
if (vertexBufferDesc.ByteWidth >= dataSizeInBytes) {
- rendererData->d3dContext->UpdateSubresource(rendererData->vertexBuffer.Get(), 0, NULL, vertexData, dataSizeInBytes, 0);
+ D3D11_MAPPED_SUBRESOURCE mappedResource;
+ ZeroMemory(&mappedResource, sizeof(D3D11_MAPPED_SUBRESOURCE));
+ result = rendererData->d3dContext->Map(rendererData->vertexBuffer.Get(), 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource);
+ if (FAILED(result)) {
+ WIN_SetErrorFromHRESULT(__FUNCTION__, result);
+ return -1;
+ }
+ memcpy(mappedResource.pData, vertexData, dataSizeInBytes);
+ rendererData->d3dContext->Unmap(rendererData->vertexBuffer.Get(), 0);
} else {
vertexBufferDesc.ByteWidth = dataSizeInBytes;
+ vertexBufferDesc.Usage = D3D11_USAGE_DYNAMIC;
vertexBufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
+ vertexBufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
D3D11_SUBRESOURCE_DATA vertexBufferData = {0};
vertexBufferData.pSysMem = vertexData;