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d3d11: Don't fail if there's no vertex data to upload (thanks, Martin!). 

Fixes Bugzilla #4832.
This commit is contained in:
Ryan C. Gordon 2019-10-26 12:56:18 -04:00
parent 6dffc5d461
commit 1ce1364b29
1 changed files with 4 additions and 0 deletions
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4
src/render/direct3d11/SDL_render_d3d11.c
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@ -1818,6 +1818,10 @@ D3D11_UpdateVertexBuffer(SDL_Renderer *renderer,
HRESULT result = S_OK; HRESULT result = S_OK;
const int vbidx = rendererData->currentVertexBuffer; const int vbidx = rendererData->currentVertexBuffer;
if (dataSizeInBytes == 0) {
return 0; /* nothing to do. */
}
if (rendererData->vertexBuffers[vbidx] && rendererData->vertexBufferSizes[vbidx] >= dataSizeInBytes) { if (rendererData->vertexBuffers[vbidx] && rendererData->vertexBufferSizes[vbidx] >= dataSizeInBytes) {
D3D11_MAPPED_SUBRESOURCE mappedResource; D3D11_MAPPED_SUBRESOURCE mappedResource;
result = ID3D11DeviceContext_Map(rendererData->d3dContext, result = ID3D11DeviceContext_Map(rendererData->d3dContext,