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Improve msvc codegen for hot-path array LUTs 

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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44
src/video_core/surface.h
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@ -125,16 +125,6 @@ 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 = {{
1, // ABGR8U
1, // ABGR8S
@ -204,13 +194,20 @@ static constexpr u32 GetCompressionFactor(PixelFormat format) {
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 = {{
1, // ABGR8U
1, // ABGR8S
@ -279,14 +276,15 @@ static constexpr u32 GetDefaultBlockWidth(PixelFormat format) {
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 = {{
1, // ABGR8U
1, // ABGR8S
@ -356,14 +354,14 @@ static constexpr u32 GetDefaultBlockHeight(PixelFormat format) {
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 = {{
32, // ABGR8U
32, // ABGR8S
@ -433,6 +431,10 @@ static constexpr u32 GetFormatBpp(PixelFormat format) {
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)];
}