video_core: Use un-shifted block sizes to avoid integer divisions

Instead of storing all block width, height and depths in their shifted
form:

block_width = 1U << block_shift;

Store them like they are provided by the emulated hardware (their
block_shift form). This way we can avoid doing the costly
Common::AlignUp operation to align texture sizes and drop CPU integer
divisions with bitwise logic (defined in Common::AlignBits).

1 files changed, 5 insertions, 0 deletions

diff --git a/src/common/alignment.h b/src/common/alignment.h
index d94a2291f..3379a6967 100644
--- a/src/common/alignment.h
+++ b/src/common/alignment.h
@@ -20,6 +20,11 @@ constexpr T AlignDown(T value, std::size_t size) {
 }
 
 template <typename T>
+constexpr T AlignBits(T value, T align) {
+    return (value + ((1 << align) - 1)) >> align << align;
+}
+
+template <typename T>
 constexpr bool Is4KBAligned(T value) {
     static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
     return (value & 0xFFF) == 0;