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Improve msvc codegen for hot-path array LUTs

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In some constexpr functions, msvc is building the LUT at runtime
(pushing each element onto the stack) out of an abundance of caution. Moving the
arrays into be file-scoped constexpr's avoids this and turns the functions into
simple look-ups as intended.
This commit is contained in:
heapo 2018-12-04 10:32:00 -08:00
parent 465f486160
commit 7853e6b5d4
1 changed files with 277 additions and 275 deletions
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60
src/video_core/surface.h
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@ -125,17 +125,7 @@ enum class SurfaceTarget {
TextureCubeArray,
};
/**
* Gets the compression factor for the specified PixelFormat. This applies to just the
* "compressed width" and "compressed height", not the overall compression factor of a
* compressed image. This is used for maintaining proper surface sizes for compressed
* texture formats.
*/
static constexpr u32 GetCompressionFactor(PixelFormat format) {
if (format == PixelFormat::Invalid)
return 0;
constexpr std::array<u32, MaxPixelFormat> compression_factor_table = {{
constexpr std::array<u32, MaxPixelFormat> compression_factor_table = {{
1, // ABGR8U
1, // ABGR8S
1, // ABGR8UI
@ -202,16 +192,23 @@ static constexpr u32 GetCompressionFactor(PixelFormat format) {
1, // Z24S8
1, // S8Z24
1, // Z32FS8
}};
}};
/**
* Gets the compression factor for the specified PixelFormat. This applies to just the
* "compressed width" and "compressed height", not the overall compression factor of a
* compressed image. This is used for maintaining proper surface sizes for compressed
* texture formats.
*/
static constexpr u32 GetCompressionFactor(PixelFormat format) {
if (format == PixelFormat::Invalid)
return 0;
ASSERT(static_cast<std::size_t>(format) < compression_factor_table.size());
return compression_factor_table[static_cast<std::size_t>(format)];
}
static constexpr u32 GetDefaultBlockWidth(PixelFormat format) {
if (format == PixelFormat::Invalid)
return 0;
constexpr std::array<u32, MaxPixelFormat> block_width_table = {{
constexpr std::array<u32, MaxPixelFormat> block_width_table = {{
1, // ABGR8U
1, // ABGR8S
1, // ABGR8UI
@ -278,16 +275,17 @@ static constexpr u32 GetDefaultBlockWidth(PixelFormat format) {
1, // Z24S8
1, // S8Z24
1, // Z32FS8
}};
}};
static constexpr u32 GetDefaultBlockWidth(PixelFormat format) {
if (format == PixelFormat::Invalid)
return 0;
ASSERT(static_cast<std::size_t>(format) < block_width_table.size());
return block_width_table[static_cast<std::size_t>(format)];
}
static constexpr u32 GetDefaultBlockHeight(PixelFormat format) {
if (format == PixelFormat::Invalid)
return 0;
constexpr std::array<u32, MaxPixelFormat> block_height_table = {{
constexpr std::array<u32, MaxPixelFormat> block_height_table = {{
1, // ABGR8U
1, // ABGR8S
1, // ABGR8UI
@ -354,17 +352,17 @@ static constexpr u32 GetDefaultBlockHeight(PixelFormat format) {
1, // Z24S8
1, // S8Z24
1, // Z32FS8
}};
}};
static constexpr u32 GetDefaultBlockHeight(PixelFormat format) {
if (format == PixelFormat::Invalid)
return 0;
ASSERT(static_cast<std::size_t>(format) < block_height_table.size());
return block_height_table[static_cast<std::size_t>(format)];
}
static constexpr u32 GetFormatBpp(PixelFormat format) {
if (format == PixelFormat::Invalid)
return 0;
constexpr std::array<u32, MaxPixelFormat> bpp_table = {{
constexpr std::array<u32, MaxPixelFormat> bpp_table = {{
32, // ABGR8U
32, // ABGR8S
32, // ABGR8UI
@ -431,7 +429,11 @@ static constexpr u32 GetFormatBpp(PixelFormat format) {
32, // Z24S8
32, // S8Z24
64, // Z32FS8
}};
}};
static constexpr u32 GetFormatBpp(PixelFormat format) {
if (format == PixelFormat::Invalid)
return 0;
ASSERT(static_cast<std::size_t>(format) < bpp_table.size());
return bpp_table[static_cast<std::size_t>(format)];