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Basic 3-color support

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This commit is contained in:
Andrew Cassidy 2021-02-28 02:22:35 -08:00
parent 63cf1745f9
commit 645549978d
1 changed files with 23 additions and 12 deletions
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35
src/BC1/BC1Encoder.cpp
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@ -56,7 +56,7 @@ bool BC1Encoder::order_tables_generated = false;
// constructors
BC1Encoder::BC1Encoder(InterpolatorPtr interpolator) : _interpolator(interpolator) {
_flags = Flags::UseFullMSEEval | Flags::TwoLeastSquaresPasses | Flags::UseLikelyTotalOrderings;
_flags = Flags::UseFullMSEEval | Flags::TwoLeastSquaresPasses | Flags::UseLikelyTotalOrderings | Flags::Use3ColorBlocks;
_error_mode = ErrorMode::Full;
_endpoint_mode = EndpointMode::PCA;
_orderings4 = 8;
@ -103,8 +103,8 @@ void BC1Encoder::EncodeBlock(Color4x4 pixels, BC1Block *dest) const {
EncodeResults result;
for (unsigned round = 0; round < total_ep_rounds; round++) {
EndpointMode endpoint_mode = (round == 1) ? EndpointMode::BoundingBox : _endpoint_mode;
EncodeResults round_result;
EncodeResults round_result;
FindEndpoints(pixels, round_result, metrics, endpoint_mode);
FindSelectors<ColorMode::FourColor>(pixels, round_result, error_mode);
@ -114,7 +114,7 @@ void BC1Encoder::EncodeBlock(Color4x4 pixels, BC1Block *dest) const {
}
// First refinement pass using ordered cluster fit
if (result.error > 0 && (_flags & Flags::UseLikelyTotalOrderings) != Flags::None) {
if (result.error > 0 && (bool)(_flags & Flags::UseLikelyTotalOrderings)) {
const unsigned total_iters = (_flags & Flags::Iterative) != Flags::None ? 2 : 1;
for (unsigned iter = 0; iter < total_iters; iter++) {
EncodeResults orig = result;
@ -163,6 +163,16 @@ void BC1Encoder::EncodeBlock(Color4x4 pixels, BC1Block *dest) const {
}
}
// try for 3-color block
if (result.error > 0 && (bool)(_flags & Flags::Use3ColorBlocks)) {
EncodeResults trial_result = result;
FindSelectors<ColorMode::ThreeColor>(pixels, trial_result, ErrorMode::Full);
RefineBlockLS<ColorMode::ThreeColor>(pixels, trial_result, metrics, ErrorMode::Full, total_ls_passes);
if (trial_result.error < result.error) { result = trial_result; };
}
WriteBlock(result, dest);
}
@ -250,11 +260,11 @@ void BC1Encoder::WriteBlock(EncodeResults &block, BC1Block *dest) const {
assert(color0 > color1);
} else {
lut = {0, 2, 1, 3};
lut = {1, 2, 0, 3};
if (color1 < color0) {
std::swap(color1, color0);
lut = {1, 2, 0, 3};
lut = {0, 2, 1, 3};
}
assert(color0 <= color1);
@ -264,8 +274,13 @@ void BC1Encoder::WriteBlock(EncodeResults &block, BC1Block *dest) const {
unsigned x = i % 4;
unsigned y = i / 4;
selectors[y][x] = lut[block.selectors[i]];
if (block.color_mode == ColorMode::ThreeColor) {
assert(selectors[y][x] != 3);
}
}
// if (block.color_mode != ColorMode::ThreeColor) return;
dest->SetLowColor(color0);
dest->SetHighColor(color1);
dest->PackSelectors(selectors);
@ -574,12 +589,7 @@ template <ColorMode M> void BC1Encoder::FindSelectors(Color4x4 &pixels, EncodeRe
block.selectors[i] = best_sel;
}
} else if (error_mode == ErrorMode::Full) {
unsigned max_selector;
if ((bool)(M & ColorMode::FourColor) || (bool)(M & ColorMode::ThreeColorBlack)) {
max_selector = 4;
} else {
max_selector = 3;
}
unsigned max_sel = (bool)(M == ColorMode::ThreeColor) ? 3 : 4;
for (unsigned i = 0; i < 16; i++) {
unsigned best_error = UINT_MAX;
@ -587,7 +597,7 @@ template <ColorMode M> void BC1Encoder::FindSelectors(Color4x4 &pixels, EncodeRe
Vector4Int pixel_vector = (Vector4Int)pixels.Get(i);
// exhasustively check every pixel's distance from each color, and calculate the error
for (uint8_t j = 0; j < max_selector; j++) {
for (uint8_t j = 0; j < max_sel; j++) {
auto diff = color_vectors[j] - pixel_vector;
unsigned err = diff.SqrMag();
if (err < best_error || ((err == best_error) && (j == 3))) {
@ -599,6 +609,7 @@ template <ColorMode M> void BC1Encoder::FindSelectors(Color4x4 &pixels, EncodeRe
total_error += best_error;
if (total_error >= block.error) { break; }
assert(best_sel < max_sel);
block.selectors[i] = best_sel;
}
} else {