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astc: Move Replicate to a constexpr LUT when possible

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This commit is contained in:
ReinUsesLisp 2020-04-09 03:35:07 -03:00
parent d22a689250
commit 6b4d4473be
1 changed files with 38 additions and 8 deletions
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46
src/video_core/textures/astc.cpp
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@ -628,12 +628,14 @@ static void FillError(u32* outBuf, u32 blockWidth, u32 blockHeight) {
// Replicates low numBits such that [(toBit - 1):(toBit - 1 - fromBit)]
// is the same as [(numBits - 1):0] and repeats all the way down.
template <typename IntType>
static IntType Replicate(IntType val, u32 numBits, u32 toBit) {
if (numBits == 0)
static constexpr IntType Replicate(IntType val, u32 numBits, u32 toBit) {
if (numBits == 0) {
return 0;
if (toBit == 0)
}
if (toBit == 0) {
return 0;
IntType v = val & static_cast<IntType>((1 << numBits) - 1);
}
const IntType v = val & static_cast<IntType>((1 << numBits) - 1);
IntType res = v;
u32 reslen = numBits;
while (reslen < toBit) {
@ -650,6 +652,34 @@ static IntType Replicate(IntType val, u32 numBits, u32 toBit) {
return res;
}
static constexpr std::size_t NumReplicateEntries(u32 num_bits) {
return std::size_t(1) << num_bits;
}
template <typename IntType, u32 num_bits, u32 to_bit>
static constexpr auto MakeReplicateTable() {
std::array<IntType, NumReplicateEntries(num_bits)> table{};
for (IntType value = 0; value < static_cast<IntType>(std::size(table)); ++value) {
table[value] = Replicate(value, num_bits, to_bit);
}
return table;
}
static constexpr auto REPLICATE_BYTE_TO_16_TABLE = MakeReplicateTable<u32, 8, 16>();
static constexpr u32 ReplicateByteTo16(std::size_t value) {
return REPLICATE_BYTE_TO_16_TABLE[value];
}
static constexpr auto REPLICATE_BIT_TO_7_TABLE = MakeReplicateTable<u32, 1, 7>();
static constexpr u32 ReplicateBitTo7(std::size_t value) {
return REPLICATE_BIT_TO_7_TABLE[value];
}
static constexpr auto REPLICATE_BIT_TO_9_TABLE = MakeReplicateTable<u32, 1, 9>();
static constexpr u32 ReplicateBitTo9(std::size_t value) {
return REPLICATE_BIT_TO_9_TABLE[value];
}
class Pixel {
protected:
using ChannelType = s16;
@ -833,7 +863,7 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
u32 A = 0, B = 0, C = 0, D = 0;
// A is just the lsb replicated 9 times.
A = Replicate(bitval & 1, 1, 9);
A = ReplicateBitTo9(bitval & 1);
switch (val.encoding) {
// Replicate bits
@ -956,7 +986,7 @@ static u32 UnquantizeTexelWeight(const IntegerEncodedValue& val) {
u32 bitval = val.bit_value;
u32 bitlen = val.num_bits;
u32 A = Replicate(bitval & 1, 1, 7);
u32 A = ReplicateBitTo7(bitval & 1);
u32 B = 0, C = 0, D = 0;
u32 result = 0;
@ -1562,9 +1592,9 @@ static void DecompressBlock(const u8 inBuf[16], const u32 blockWidth, const u32
Pixel p;
for (u32 c = 0; c < 4; c++) {
u32 C0 = endpos32s[partition][0].Component(c);
C0 = Replicate(C0, 8, 16);
C0 = ReplicateByteTo16(C0);
u32 C1 = endpos32s[partition][1].Component(c);
C1 = Replicate(C1, 8, 16);
C1 = ReplicateByteTo16(C1);
u32 plane = 0;
if (weightParams.m_bDualPlane && (((planeIdx + 1) & 3) == c)) {