rasterizer_accelerated: Add intermediary for GPU rasterizers

Add an intermediary class that implements common functions across GPU
accelerated rasterizers. This avoids code repetition on different
backends.

1 files changed, 63 insertions, 0 deletions

diff --git a/src/video_core/rasterizer_accelerated.cpp b/src/video_core/rasterizer_accelerated.cpp
new file mode 100644
index 000000000..b230dcc18
--- /dev/null
+++ b/src/video_core/rasterizer_accelerated.cpp
@@ -0,0 +1,63 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <mutex>
+
+#include <boost/icl/interval_map.hpp>
+
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "core/memory.h"
+#include "video_core/rasterizer_accelerated.h"
+
+namespace VideoCore {
+
+namespace {
+
+template <typename Map, typename Interval>
+constexpr auto RangeFromInterval(Map& map, const Interval& interval) {
+    return boost::make_iterator_range(map.equal_range(interval));
+}
+
+} // Anonymous namespace
+
+RasterizerAccelerated::RasterizerAccelerated() = default;
+
+RasterizerAccelerated::~RasterizerAccelerated() = default;
+
+void RasterizerAccelerated::UpdatePagesCachedCount(VAddr addr, u64 size, int delta) {
+    std::lock_guard lock{pages_mutex};
+    const u64 page_start{addr >> Memory::PAGE_BITS};
+    const u64 page_end{(addr + size + Memory::PAGE_SIZE - 1) >> Memory::PAGE_BITS};
+
+    // Interval maps will erase segments if count reaches 0, so if delta is negative we have to
+    // subtract after iterating
+    const auto pages_interval = CachedPageMap::interval_type::right_open(page_start, page_end);
+    if (delta > 0) {
+        cached_pages.add({pages_interval, delta});
+    }
+
+    for (const auto& pair : RangeFromInterval(cached_pages, pages_interval)) {
+        const auto interval = pair.first & pages_interval;
+        const int count = pair.second;
+
+        const VAddr interval_start_addr = boost::icl::first(interval) << Memory::PAGE_BITS;
+        const VAddr interval_end_addr = boost::icl::last_next(interval) << Memory::PAGE_BITS;
+        const u64 interval_size = interval_end_addr - interval_start_addr;
+
+        if (delta > 0 && count == delta) {
+            Memory::RasterizerMarkRegionCached(interval_start_addr, interval_size, true);
+        } else if (delta < 0 && count == -delta) {
+            Memory::RasterizerMarkRegionCached(interval_start_addr, interval_size, false);
+        } else {
+            ASSERT(count >= 0);
+        }
+    }
+
+    if (delta < 0) {
+        cached_pages.add({pages_interval, delta});
+    }
+}
+
+} // namespace VideoCore