BufferCache: fix clearing on forced download.

src/video_core/buffer_cache/buffer_cache.h

@@ -329,6 +329,8 @@ private:
 
     [[nodiscard]] bool HasFastUniformBufferBound(size_t stage, u32 binding_index) const noexcept;
 
+    void ClearDownload(IntervalType subtract_interval);
+
     VideoCore::RasterizerInterface& rasterizer;
     Tegra::Engines::Maxwell3D& maxwell3d;
     Tegra::Engines::KeplerCompute& kepler_compute;
@@ -467,6 +469,14 @@ void BufferCache<P>::DownloadMemory(VAddr cpu_addr, u64 size) {
     });
 }
 
+template <class P>
+void BufferCache<P>::ClearDownload(IntervalType subtract_interval) {
+    uncommitted_ranges.subtract(subtract_interval);
+    for (auto& interval_set : committed_ranges) {
+        interval_set.subtract(subtract_interval);
+    }
+}
+
 template <class P>
 bool BufferCache<P>::DMACopy(GPUVAddr src_address, GPUVAddr dest_address, u64 amount) {
     const std::optional<VAddr> cpu_src_address = gpu_memory.GpuToCpuAddress(src_address);
@@ -481,10 +491,7 @@ bool BufferCache<P>::DMACopy(GPUVAddr src_address, GPUVAddr dest_address, u64 am
     }
 
     const IntervalType subtract_interval{*cpu_dest_address, *cpu_dest_address + amount};
-    uncommitted_ranges.subtract(subtract_interval);
-    for (auto& interval_set : committed_ranges) {
-        interval_set.subtract(subtract_interval);
-    }
+    ClearDownload(subtract_interval);
 
     BufferId buffer_a;
     BufferId buffer_b;
@@ -496,7 +503,6 @@ bool BufferCache<P>::DMACopy(GPUVAddr src_address, GPUVAddr dest_address, u64 am
     auto& src_buffer = slot_buffers[buffer_a];
     auto& dest_buffer = slot_buffers[buffer_b];
     SynchronizeBuffer(src_buffer, *cpu_src_address, static_cast<u32>(amount));
-    SynchronizeBuffer(dest_buffer, *cpu_dest_address, static_cast<u32>(amount));
     std::array copies{BufferCopy{
         .src_offset = src_buffer.Offset(*cpu_src_address),
         .dst_offset = dest_buffer.Offset(*cpu_dest_address),
@@ -515,12 +521,17 @@ bool BufferCache<P>::DMACopy(GPUVAddr src_address, GPUVAddr dest_address, u64 am
     ForEachWrittenRange(*cpu_src_address, amount, mirror);
     // This subtraction in this order is important for overlapping copies.
     common_ranges.subtract(subtract_interval);
+    bool atleast_1_download = tmp_intervals.size() != 0;
     for (const IntervalType add_interval : tmp_intervals) {
         common_ranges.add(add_interval);
     }
 
+    if (dest_buffer.HasCachedWrites()) {
+        dest_buffer.FlushCachedWrites();
+    }
     runtime.CopyBuffer(dest_buffer, src_buffer, copies);
-    if (IsRegionGpuModified(*cpu_src_address, amount)) {
+    dest_buffer.UnmarkRegionAsCpuModified(*cpu_dest_address, amount);
+    if (atleast_1_download) {
         dest_buffer.MarkRegionAsGpuModified(*cpu_dest_address, amount);
     }
     std::vector<u8> tmp_buffer(amount);
@@ -541,10 +552,7 @@ bool BufferCache<P>::DMAClear(GPUVAddr dst_address, u64 amount, u32 value) {
     }
 
     const IntervalType subtract_interval{*cpu_dst_address, *cpu_dst_address + amount * sizeof(u32)};
-    uncommitted_ranges.subtract(subtract_interval);
-    for (auto& interval_set : committed_ranges) {
-        interval_set.subtract(subtract_interval);
-    }
+    ClearDownload(subtract_interval);
     common_ranges.subtract(subtract_interval);
 
     const size_t size = amount * sizeof(u32);
@@ -557,6 +565,7 @@ bool BufferCache<P>::DMAClear(GPUVAddr dst_address, u64 amount, u32 value) {
     auto& dest_buffer = slot_buffers[buffer];
     const u32 offset = static_cast<u32>(*cpu_dst_address - dest_buffer.CpuAddr());
     runtime.ClearBuffer(dest_buffer, offset, size, value);
+    dest_buffer.UnmarkRegionAsCpuModified(*cpu_dst_address, size);
     return true;
 }
 
@@ -1482,6 +1491,7 @@ void BufferCache<P>::DownloadBufferMemory(Buffer& buffer, VAddr cpu_addr, u64 si
         const VAddr end_address = start_address + range_size;
         ForEachWrittenRange(start_address, range_size, add_download);
         const IntervalType subtract_interval{start_address, end_address};
+        ClearDownload(subtract_interval);
         common_ranges.subtract(subtract_interval);
     });
     if (total_size_bytes == 0) {