video_core/compatible_formats: Table to test if two formats are legal to view or copy

Add a flat table to test if it's legal to create a texture view between
two formats or copy betweem them.

This table is based on ARB_copy_image and ARB_texture_view. Copies are
more permissive than views.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/video_core/compatible_formats.h b/src/video_core/compatible_formats.h
new file mode 100644
index 000000000..d1082566d
--- /dev/null
+++ b/src/video_core/compatible_formats.h
@@ -0,0 +1,32 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <array>
+#include <bitset>
+#include <cstddef>
+
+#include "video_core/surface.h"
+
+namespace VideoCore::Surface {
+
+class FormatCompatibility {
+public:
+    using Table = std::array<std::bitset<MaxPixelFormat>, MaxPixelFormat>;
+
+    explicit FormatCompatibility();
+
+    bool TestView(PixelFormat format_a, PixelFormat format_b) const noexcept {
+        return view[static_cast<size_t>(format_a)][static_cast<size_t>(format_b)];
+    }
+
+    bool TestCopy(PixelFormat format_a, PixelFormat format_b) const noexcept {
+        return copy[static_cast<size_t>(format_a)][static_cast<size_t>(format_b)];
+    }
+
+private:
+    Table view;
+    Table copy;
+};
+
+} // namespace VideoCore::Surface