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Fix D3D11 push buffer overflow

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This commit is contained in:
Henrik Rydgård 2017-11-24 17:53:42 +01:00
parent bb9181b949
commit ce818263a1
1 changed files with 8 additions and 1 deletions
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9
GPU/D3D11/D3D11Util.h
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@ -22,7 +22,7 @@
class PushBufferD3D11 {
public:
PushBufferD3D11(ID3D11Device *device, size_t size, D3D11_BIND_FLAG bindFlags) {
PushBufferD3D11(ID3D11Device *device, size_t size, D3D11_BIND_FLAG bindFlags) : size_(size) {
D3D11_BUFFER_DESC desc{};
desc.BindFlags = bindFlags;
desc.ByteWidth = (UINT)size;
@ -47,6 +47,12 @@ public:
uint8_t *BeginPush(ID3D11DeviceContext *context, UINT *offset, size_t size, int align = 16) {
D3D11_MAPPED_SUBRESOURCE map;
pos_ = (pos_ + align - 1) & ~(align - 1);
if (pos_ + size > size_) {
// Wrap! Note that with this method, since we return the same buffer as before, you have to do the draw immediately after,
// can't defer like in Vulkan. We instead let the driver handle the invalidation etc.
pos_ = 0;
nextMapDiscard_ = true;
}
context->Map(buffer_, 0, nextMapDiscard_ ? D3D11_MAP_WRITE_DISCARD : D3D11_MAP_WRITE_NO_OVERWRITE, 0, &map);
nextMapDiscard_ = false;
*offset = (UINT)pos_;
@ -61,6 +67,7 @@ public:
private:
ID3D11Buffer *buffer_ = nullptr;
size_t pos_ = 0;
size_t size_;
bool nextMapDiscard_ = false;
};