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softgpu: Point depthbuf at the first VRAM mirror #18362

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Oct 15, 2023
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softgpu: Point depthbuf at the first VRAM mirror #18362

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4 changes: 3 additions & 1 deletion GPU/Software/SoftGpu.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1040,7 +1040,9 @@ void SoftGPU::Execute_ZbufPtr(u32 op, u32 diff) {
// We assume depthbuf.data won't change while we're drawing.
if (diff) {
drawEngine_->transformUnit.Flush("depthbuf");
depthbuf.data = Memory::GetPointerWrite(gstate.getDepthBufAddress());
// For the pointer, ignore memory mirrors. This also gives some buffer for draws that go outside.
// TODO: Confirm how wrapping is handled in drawing. Adjust if we ever handle VRAM mirrors more accurately.
depthbuf.data = Memory::GetPointerWrite(gstate.getDepthBufAddress() & 0x041FFFF0);
}
}

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