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authorReinUsesLisp <reinuseslisp@airmail.cc>2020-04-09 08:35:07 +0200
committerReinUsesLisp <reinuseslisp@airmail.cc>2020-04-09 08:35:07 +0200
commit6b4d4473be7ec428ae3501534c6f5e19bfda35ee (patch)
treeec31a9e118ebb28d33f2ccac8c3bf81e9676de71 /src
parentastc: Make InputBitStream constexpr (diff)
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Diffstat (limited to 'src')
-rw-r--r--src/video_core/textures/astc.cpp46
1 files changed, 38 insertions, 8 deletions
diff --git a/src/video_core/textures/astc.cpp b/src/video_core/textures/astc.cpp
index 91b4c5d7e..0985cb578 100644
--- a/src/video_core/textures/astc.cpp
+++ b/src/video_core/textures/astc.cpp
@@ -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)) {