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Universal WriteBlock

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This commit is contained in:
Andrew Cassidy 2021-02-27 22:27:31 -08:00
parent 28c9f857ea
commit 63cf1745f9
2 changed files with 46 additions and 24 deletions
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66
src/BC1/BC1Encoder.cpp
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@ -85,7 +85,7 @@ void BC1Encoder::EncodeBlock(Color4x4 pixels, BC1Block *dest) const {
if (pixels.IsSingleColor()) {
// single-color pixel block, do it the fast way
EncodeBlockSingleColor(first, dest);
WriteBlockSolid(first, dest);
return;
}
@ -162,10 +162,11 @@ void BC1Encoder::EncodeBlock(Color4x4 pixels, BC1Block *dest) const {
}
}
}
EncodeBlock4Color(result, dest);
WriteBlock(result, dest);
}
void BC1Encoder::EncodeBlockSingleColor(Color color, BC1Block *dest) const {
void BC1Encoder::WriteBlockSolid(Color color, BC1Block *dest) const {
uint8_t mask = 0xAA; // 2222
uint16_t min16, max16;
@ -220,22 +221,44 @@ void BC1Encoder::EncodeBlockSingleColor(Color color, BC1Block *dest) const {
dest->selectors[3] = mask;
}
void BC1Encoder::EncodeBlock4Color(EncodeResults &block, BC1Block *dest) const {
const std::array<uint8_t, 4> lut = {0, 2, 3, 1};
if (block.low == block.high) {
EncodeBlockSingleColor(block.low.ScaleFrom565() /* Color(255, 0, 255)*/, dest);
return;
}
uint8_t mask = 0;
uint16_t low = block.low.Pack565Unscaled();
uint16_t high = block.high.Pack565Unscaled();
if (low < high) {
std::swap(low, high);
mask = 0x55;
}
void BC1Encoder::WriteBlock(EncodeResults &block, BC1Block *dest) const {
bool flip = false;
BC1Block::UnpackedSelectors selectors;
uint16_t color1 = block.low.Pack565Unscaled();
uint16_t color0 = block.high.Pack565Unscaled();
std::array<uint8_t, 4> lut;
assert(block.color_mode != ColorMode::Incomplete);
if ((bool)(block.color_mode & ColorMode::FourColor)) {
lut = {1, 3, 2, 0};
if (color1 > color0) {
std::swap(color1, color0);
lut = {0, 2, 3, 1};
} else if (color1 == color0) {
if (color1 > 0) {
color1--;
lut = {0, 0, 0, 0};
} else {
assert(color1 == 0 && color0 == 0);
color0 = 1;
color1 = 0;
lut = {1, 1, 1, 1};
}
}
assert(color0 > color1);
} else {
lut = {0, 2, 1, 3};
if (color1 < color0) {
std::swap(color1, color0);
lut = {1, 2, 0, 3};
}
assert(color0 <= color1);
}
for (unsigned i = 0; i < 16; i++) {
unsigned x = i % 4;
@ -243,10 +266,9 @@ void BC1Encoder::EncodeBlock4Color(EncodeResults &block, BC1Block *dest) const {
selectors[y][x] = lut[block.selectors[i]];
}
assert(low > high);
dest->SetLowColor(low);
dest->SetHighColor(high);
dest->PackSelectors(selectors, mask);
dest->SetLowColor(color0);
dest->SetHighColor(color1);
dest->PackSelectors(selectors);
}
void BC1Encoder::FindEndpointsSingleColor(EncodeResults &block, Color color, bool is_3color) const {

4
src/BC1/BC1Encoder.h
View File

@ -153,8 +153,8 @@ class BC1Encoder final : public BlockEncoder<BC1Block, 4, 4> {
static std::mutex order_table_mutex; // prevent race condition with multiple BC1Encoders constructed at once
static bool order_tables_generated; // have the order tables been generated by a previous instance?
void EncodeBlockSingleColor(Color color, BC1Block *dest) const;
void EncodeBlock4Color(EncodeResults &block, BC1Block *dest) const;
void WriteBlockSolid(Color color, BC1Block *dest) const;
void WriteBlock(EncodeResults &block, BC1Block *dest) const;
void FindEndpoints(Color4x4 pixels, EncodeResults &block, const BlockMetrics &metrics, EndpointMode endpoint_mode) const;
void FindEndpointsSingleColor(EncodeResults &block, Color color, bool is_3color = false) const;