forked from yvt/terravox
/
brushtool.cpp
764 lines (670 loc) · 28.4 KB
/
brushtool.cpp
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#include "brushtool.h"
#include "terrain.h"
#include <cmath>
#include "terrainedit.h"
#include <xmmintrin.h>
#include <smmintrin.h>
#include "dithersampler.h"
#include <numeric>
#include "temporarybuffer.h"
#include "coherentnoisegenerator.h"
#include <random>
#include "cpu.h"
#if defined(__APPLE__)
# define sqrtf std::sqrtf
#endif
BrushTool::BrushTool(BrushType type, QObject *parent) :
QObject(parent),
type_(type)
{
parameters_.size = 10;
parameters_.tipType = BrushTipType::Sphere;
switch (type) {
case BrushType::Lower:
case BrushType::Raise:
parameters_.strength = 5.f;
break;
default:
parameters_.strength = 50.f;
break;
}
parameters_.pressureMode = BrushPressureMode::AirBrush;
parameters_.color = 0;
parameters_.scale = 10.f;
parameters_.randomize();
}
void BrushToolParameters::randomize()
{
std::random_device rgen;
std::uniform_int_distribution<quint32> dist(0, std::numeric_limits<quint32>::max());
seed = dist(rgen);
}
BrushTool::~BrushTool()
{
}
void BrushTool::setParameters(const BrushToolParameters &t)
{
parameters_ = t;
emit parameterChanged();
discardTip();
}
static CoherentNoiseGenerator noiseGen(9, 1);
static uint noiseGenSeed = 1;
QSharedPointer<Terrain> BrushTool::tip(QPoint origin)
{
bool needToGenerate = false;
if (!tip_) {
tip_ = QSharedPointer<Terrain>::create(QSize(parameters_.size, parameters_.size));
needToGenerate = true;
}
if (origin.x() < -500) {
origin = lastTipOrigin_;
}
if (origin != lastTipOrigin_) {
switch (parameters_.tipType) {
case BrushTipType::Mountains:
needToGenerate = true;
break;
default:
// position invariant
break;
}
}
if (needToGenerate) {
Terrain *t = tip_.data();
auto size = parameters_.size;
float scale = 1.f / size;
switch (parameters_.tipType) {
case BrushTipType::Mountains:
{
// Set rounding mode (required by CoherentNoiseGenerator)
SseRoundingModeScope roundingModeScope(_MM_ROUND_DOWN);
(void) roundingModeScope;
if (noiseGenSeed != parameters_.seed) {
noiseGenSeed = parameters_.seed;
noiseGen.randomize(static_cast<std::uint_fast32_t>(noiseGenSeed));
}
auto noise = noiseGen.sampler();
__m128i originMM = _mm_setr_epi32(origin.x(), origin.y(), 0, 0);
float noiseScale = 10.f / parameters_.scale;
for (int y = 0; y < size; ++y) {
for (int x = 0; x < size; ++x) {
int cx = (x << 1) - size + 1;
int cy = (y << 1) - size + 1;
float sq = 1.f - sqrtf(cx * cx + cy * cy) * scale;
float alt;
if (sq <= 0.f) {
alt = 0.f;
} else {
auto posI = _mm_add_epi32(_mm_setr_epi32(x, y, 0, 0), originMM);
auto pos = _mm_cvtepi32_ps(posI);
pos = _mm_mul_ps(pos, _mm_set1_ps(noiseScale));
auto pos1 = _mm_mul_ps(pos, _mm_set1_ps(0.1f));
pos = _mm_unpacklo_ps(_mm_hadd_ps(pos, pos), _mm_hsub_ps(pos, pos));
auto pos2 = _mm_mul_ps(pos, _mm_set1_ps(0.15f));
auto pos3 = _mm_mul_ps(pos, _mm_set1_ps(0.3f));
auto pos4 = _mm_mul_ps(pos, _mm_set1_ps(0.03f));
float noiseVal = noise.sample(pos1);
noiseVal += noise.sample(pos2) * .3f;
noiseVal += noise.sample(pos3) * .15f;
noiseVal += noise.sample(pos4) * 1.5f;
noiseVal = std::max(std::min(0.5f + noiseVal * 1.1f, 1.f), 0.f);
float sqBase = sq;
sq *= sq * (3.f - 2.f * sq) * 0.8f;
sq *= sq;
sq -= 0.1f;
sq += (sqBase - sq) * std::abs(noiseVal);
alt = std::max(0.f, sq);
}
t->landform(x, y) = alt;
}
}
}
break;
case BrushTipType::Bell:
for (int y = 0; y < size; ++y) {
for (int x = 0; x < size; ++x) {
int cx = (x << 1) - size + 1;
int cy = (y << 1) - size + 1;
float sq = 1.f - sqrtf(cx * cx + cy * cy) * scale;
float alt;
if (sq <= 0.f) {
alt = 0.f;
} else {
sq *= sq * (3.f - 2.f * sq);
alt = sq;
}
t->landform(x, y) = alt;
}
}
break;
case BrushTipType::Cone:
for (int y = 0; y < size; ++y) {
for (int x = 0; x < size; ++x) {
int cx = (x << 1) - size + 1;
int cy = (y << 1) - size + 1;
float sq = 1.f - sqrtf(cx * cx + cy * cy) * scale;
float alt;
if (sq <= 0.f) {
alt = 0.f;
} else {
alt = sq;
}
t->landform(x, y) = alt;
}
}
break;
case BrushTipType::Sphere:
scale *= scale;
for (int y = 0; y < size; ++y) {
for (int x = 0; x < size; ++x) {
int cx = (x << 1) - size + 1;
int cy = (y << 1) - size + 1;
float sq = 1.f - (cx * cx + cy * cy) * scale;
float alt;
if (sq <= 0.f) {
alt = 0.f;
} else {
alt = std::sqrt(sq);
}
t->landform(x, y) = alt;
}
}
break;
case BrushTipType::Cylinder:
for (int y = 0; y < size; ++y) {
for (int x = 0; x < size; ++x) {
int cx = (x << 1) - size + 1;
int cy = (y << 1) - size + 1;
float sq = size * size - (cx * cx + cy * cy);
float alt;
if (sq <= 0.f) {
alt = 0.f;
} else {
alt = 1.f;
}
t->landform(x, y) = alt;
}
}
break;
case BrushTipType::Square:
for (int y = 0; y < size; ++y) {
for (int x = 0; x < size; ++x) {
t->landform(x, y) = 1.f;
}
}
break;
}
}
return tip_;
}
BrushToolEdit *BrushTool::edit(TerrainEdit *edit, Terrain *terrain)
{
return new BrushToolEdit(edit, terrain, this);
}
void BrushTool::discardTip()
{
tip_.reset();
}
BrushToolEdit::BrushToolEdit(TerrainEdit *edit, Terrain *terrain, BrushTool *tool) :
tool(tool),
edit(edit),
terrain(terrain),
params(tool->parameters())
{
}
BrushToolEdit::~BrushToolEdit()
{
}
template <class Map>
void BrushToolEdit::drawRaiseLower(const QPoint &pt, Map &&map)
{
Terrain *tip = tool->tip(pt).data();
// compute affected rectangle
QRect dirtyRect(pt, tip->size());
dirtyRect = dirtyRect.intersected(QRect(QPoint(0, 0), terrain->size()));
if (!dirtyRect.isValid()) {
return;
}
// get "before" terrain
if (tool->before_ == nullptr || tool->before_->size() != tip->size()) {
tool->before_ = QSharedPointer<Terrain>::create(tip->size());
}
Terrain *before = tool->before_.data();
edit->copyBeforeTo(dirtyRect, terrain, before);
edit->beginEdit(dirtyRect, terrain);
for (int y = 0; y < dirtyRect.height(); ++y) {
for (int x = 0; x < dirtyRect.width(); ++x) {
int cx = x + dirtyRect.left();
int cy = y + dirtyRect.top();
int tx = cx - pt.x();
int ty = cy - pt.y();
map(terrain->landform(cx, cy), before->landform(x, y), tip->landform(tx, ty));
}
}
edit->endEdit(terrain);
}
template <class Map>
void BrushToolEdit::drawColor(const QPoint &pt, Map &&map)
{
Terrain *tip = tool->tip(pt).data();
// compute affected rectangle
QRect dirtyRect(pt, tip->size());
dirtyRect = dirtyRect.intersected(QRect(QPoint(0, 0), terrain->size()));
if (!dirtyRect.isValid()) {
return;
}
// get "before" terrain
if (tool->before_ == nullptr || tool->before_->size() != tip->size()) {
tool->before_ = QSharedPointer<Terrain>::create(tip->size());
}
Terrain *before = tool->before_.data();
edit->copyBeforeTo(dirtyRect, terrain, before);
edit->beginEdit(dirtyRect, terrain);
for (int y = 0; y < dirtyRect.height(); ++y) {
for (int x = 0; x < dirtyRect.width(); ++x) {
int cx = x + dirtyRect.left();
int cy = y + dirtyRect.top();
int tx = cx - pt.x();
int ty = cy - pt.y();
map(terrain->color(cx, cy), before->color(x, y), tip->landform(tx, ty));
}
}
edit->endEdit(terrain);
}
struct GaussianKernelTable
{
__m128 table[65]; // (sigma^2) = {0 ... 4}
// for 1d gaussian kernel
// [v1, v2, v3, v4, v5, v6, v7]
// table entry contains:
// [v4 / 2, v3, v2, v1] == [v4 / 2, v5, v6, v7]
GaussianKernelTable()
{
for (int i = 0; i <= 64; ++i) {
float sigmaSqr = i / 16.f + .0001f;
float kernel[4];
for (int k = 0; k < 4; ++k) {
kernel[k] = std::exp(-(k * k) / (2.f * sigmaSqr));
}
kernel[0] *= 0.5f;
float totalEnergy = std::accumulate(kernel, kernel + 4, 0.f);
float scale = 0.5f / totalEnergy;
for (auto &k: kernel) k *= scale;
table[i] = _mm_loadu_ps(kernel);
}
}
inline __m128 fetch(float sigmaSqr) {
int i = static_cast<int>(sigmaSqr * 16.f + .5f);
i = std::min(i, 64);
return _mm_loadu_ps(reinterpret_cast<const float *>(table + i));
}
};
static GaussianKernelTable globalGaussianKernelTable;
void BrushToolEdit::drawBlur(const QPoint &pt, float amount)
{
Terrain *tip = tool->tip(pt).data();
// compute affected rectangle
QRect dirtyRect(pt, tip->size());
dirtyRect = dirtyRect.intersected(QRect(QPoint(0, 0), terrain->size()));
if (!dirtyRect.isValid()) {
return;
}
edit->beginEdit(dirtyRect, terrain);
QSize tSize = terrain->size();
QSize tipSize = tip->size();
QSize blurBufferSize(dirtyRect.width() + 6, dirtyRect.height() + 6);
TemporaryBuffer<__m128> blurBuffer1(blurBufferSize.width() * blurBufferSize.height(), 16);
TemporaryBuffer<__m128> blurBuffer2(blurBufferSize.width() * blurBufferSize.height(), 16);
TemporaryBuffer<float> tipBuffer(blurBufferSize.width() * blurBufferSize.height(), 4);
for (int y = 0; y < blurBufferSize.height(); ++y) {
int cy = y + dirtyRect.top() - 3;
cy = std::max(std::min(cy, tSize.height() - 1), 0);
for (int x = 0; x < blurBufferSize.width(); ++x) {
int cx = x + dirtyRect.left() - 3;
cx = std::max(std::min(cx, tSize.width() - 1), 0);
quint32 color = terrain->color(cx, cy);
auto colorMM = _mm_setr_epi32(color, 0, 0, 0);
colorMM = _mm_unpacklo_epi8(colorMM, _mm_setzero_si128());
colorMM = _mm_unpacklo_epi16(colorMM, _mm_setzero_si128());
auto colorF = _mm_cvtepi32_ps(colorMM);
_mm_store_ps(reinterpret_cast<float *>(blurBuffer1 + x + y * blurBufferSize.width()), colorF);
}
}
for (int y = 0; y < blurBufferSize.height(); ++y) {
int cy = y + dirtyRect.top() - 3;
int ty = cy - pt.y();
if (ty >= 0 && ty < tipSize.height()) {
for (int x = 0; x < blurBufferSize.width(); ++x) {
int cx = x + dirtyRect.left() - 3;
int tx = cx - pt.x();
tipBuffer[x + y * blurBufferSize.width()] =
tx >= 0 && tx < tipSize.width() ?
tip->landform(tx, ty) * amount :
0.f;
}
} else {
std::fill(&tipBuffer[y * blurBufferSize.width()],
&tipBuffer[(y + 1) * blurBufferSize.width()], 0.f);
}
}
// apply horizontal blur
for (int y = 0; y < blurBufferSize.height(); ++y) {
__m128 *inBuf = blurBuffer1 + y * blurBufferSize.width();
__m128 *outBuf = blurBuffer2 + y * blurBufferSize.width();
float *varBuf = tipBuffer + y * blurBufferSize.width();
for (int x = 3; x < blurBufferSize.width() - 3; ++x) {
float variance = varBuf[x];
__m128 kernel = globalGaussianKernelTable.fetch(variance);
// sample input
__m128 p1 = _mm_load_ps(reinterpret_cast<float *>(inBuf + x));
p1 = _mm_add_ps(p1, p1);
__m128 p2 = _mm_load_ps(reinterpret_cast<float *>(inBuf + x + 1));
p2 = _mm_add_ps(p2, _mm_load_ps(reinterpret_cast<float *>(inBuf + x - 1)));
__m128 p3 = _mm_load_ps(reinterpret_cast<float *>(inBuf + x + 2));
p3 = _mm_add_ps(p3, _mm_load_ps(reinterpret_cast<float *>(inBuf + x - 2)));
__m128 p4 = _mm_load_ps(reinterpret_cast<float *>(inBuf + x + 3));
p4 = _mm_add_ps(p4, _mm_load_ps(reinterpret_cast<float *>(inBuf + x - 3)));
// apply kernel
p1 = _mm_mul_ps(p1, _mm_shuffle_ps(kernel, kernel, _MM_SHUFFLE(0, 0, 0, 0)));
p2 = _mm_mul_ps(p2, _mm_shuffle_ps(kernel, kernel, _MM_SHUFFLE(1, 1, 1, 1)));
p3 = _mm_mul_ps(p3, _mm_shuffle_ps(kernel, kernel, _MM_SHUFFLE(2, 2, 2, 2)));
p4 = _mm_mul_ps(p4, _mm_shuffle_ps(kernel, kernel, _MM_SHUFFLE(3, 3, 3, 3)));
p1 = _mm_add_ps(p1, p2);
p3 = _mm_add_ps(p3, p4);
auto p = _mm_add_ps(p1, p3);
// store
_mm_store_ps(reinterpret_cast<float *>(outBuf + x), p);
}
}
// apply vertical blur
for (int y = 3; y < blurBufferSize.height() - 3; ++y) {
__m128 *inBuf = blurBuffer2 + y * blurBufferSize.width();
__m128 *outBuf = blurBuffer1 + y * blurBufferSize.width();
float *varBuf = tipBuffer + y * blurBufferSize.width();
for (int x = 3; x < blurBufferSize.width() - 3; x += 1) {
// fetch kernel
__m128 kernel = globalGaussianKernelTable.fetch(varBuf[x]);
// load input
__m128 p1 = _mm_load_ps(reinterpret_cast<float *>(inBuf + x));
p1 = _mm_add_ps(p1, p1);
__m128 p2 = _mm_load_ps(reinterpret_cast<float *>(inBuf + x - blurBufferSize.width()));
p2 = _mm_add_ps(p2, _mm_load_ps(reinterpret_cast<float *>(inBuf + x + blurBufferSize.width())));
__m128 p3 = _mm_load_ps(reinterpret_cast<float *>(inBuf + x - blurBufferSize.width() * 2));
p3 = _mm_add_ps(p3, _mm_load_ps(reinterpret_cast<float *>(inBuf + x + blurBufferSize.width() * 2)));
__m128 p4 = _mm_load_ps(reinterpret_cast<float *>(inBuf + x - blurBufferSize.width() * 3));
p4 = _mm_add_ps(p4, _mm_load_ps(reinterpret_cast<float *>(inBuf + x + blurBufferSize.width() * 3)));
// apply kernel
p1 = _mm_mul_ps(p1, _mm_shuffle_ps(kernel, kernel, _MM_SHUFFLE(0, 0, 0, 0)));
p2 = _mm_mul_ps(p2, _mm_shuffle_ps(kernel, kernel, _MM_SHUFFLE(1, 1, 1, 1)));
p3 = _mm_mul_ps(p3, _mm_shuffle_ps(kernel, kernel, _MM_SHUFFLE(2, 2, 2, 2)));
p4 = _mm_mul_ps(p4, _mm_shuffle_ps(kernel, kernel, _MM_SHUFFLE(3, 3, 3, 3)));
p1 = _mm_add_ps(p1, p2);
p3 = _mm_add_ps(p3, p4);
auto p = _mm_add_ps(p1, p3);
// store
_mm_store_ps(reinterpret_cast<float *>(outBuf + x), p);
}
}
for (int y = 0; y < dirtyRect.height(); ++y) {
__m128 *inBuf = blurBuffer1 + (y + 3) * blurBufferSize.width() + 3;
for (int x = 0; x < dirtyRect.width(); ++x) {
int cx = x + dirtyRect.left();
int cy = y + dirtyRect.top();
auto colorF = _mm_load_ps(reinterpret_cast<float *>(inBuf + x));
colorF = _mm_add_ps(colorF, _mm_set1_ps(0.5f));
colorF = _mm_add_ps(colorF, globalDitherSampler.getM128());
auto colorMM = _mm_cvttps_epi32(colorF);
colorMM = _mm_packs_epi32(colorMM, colorMM);
colorMM = _mm_packus_epi16(colorMM, colorMM);
_mm_store_ss(reinterpret_cast<float*>(&terrain->color(cx, cy)), _mm_castsi128_ps(colorMM));
}
}
edit->endEdit(terrain);
}
void BrushToolEdit::drawSmoothen(const QPoint &pt, float amount)
{
Terrain *tip = tool->tip(pt).data();
// compute affected rectangle
QRect dirtyRect(pt, tip->size());
dirtyRect = dirtyRect.intersected(QRect(QPoint(0, 0), terrain->size()));
if (!dirtyRect.isValid()) {
return;
}
edit->beginEdit(dirtyRect, terrain);
QSize tSize = terrain->size();
QSize tipSize = tip->size();
QSize blurBufferSize(dirtyRect.width() + 6, dirtyRect.height() + 6);
TemporaryBuffer<float> blurBuffer1(blurBufferSize.width() * blurBufferSize.height(), 4);
TemporaryBuffer<float> blurBuffer2(blurBufferSize.width() * blurBufferSize.height(), 4);
TemporaryBuffer<float> tipBuffer(blurBufferSize.width() * blurBufferSize.height(), 4);
for (int y = 0; y < blurBufferSize.height(); ++y) {
int cy = y + dirtyRect.top() - 3;
cy = std::max(std::min(cy, tSize.height() - 1), 0);
for (int x = 0; x < blurBufferSize.width(); ++x) {
int cx = x + dirtyRect.left() - 3;
cx = std::max(std::min(cx, tSize.width() - 1), 0);
blurBuffer1[x + y * blurBufferSize.width()] =
terrain->landform(cx, cy);
}
}
for (int y = 0; y < blurBufferSize.height(); ++y) {
int cy = y + dirtyRect.top() - 3;
int ty = cy - pt.y();
if (ty >= 0 && ty < tipSize.height()) {
for (int x = 0; x < blurBufferSize.width(); ++x) {
int cx = x + dirtyRect.left() - 3;
int tx = cx - pt.x();
tipBuffer[x + y * blurBufferSize.width()] =
tx >= 0 && tx < tipSize.width() ?
tip->landform(tx, ty) * amount :
0.f;
}
} else {
std::fill(&tipBuffer[y * blurBufferSize.width()],
&tipBuffer[(y + 1) * blurBufferSize.width()], 0.f);
}
}
// apply horizontal blur
for (int y = 0; y < blurBufferSize.height(); ++y) {
float *inBuf = blurBuffer1 + y * blurBufferSize.width();
float *outBuf = blurBuffer2 + y * blurBufferSize.width();
float *varBuf = tipBuffer + y * blurBufferSize.width();
for (int x = 3; x < blurBufferSize.width() - 3; ++x) {
float variance = varBuf[x];
__m128 kernel = globalGaussianKernelTable.fetch(variance);
// sample input
__m128 p1 = _mm_loadu_ps(inBuf + x - 3);
__m128 p2 = _mm_loadu_ps(inBuf + x);
p1 = _mm_shuffle_ps(p1, p1, _MM_SHUFFLE(0, 1, 2, 3));
auto p = _mm_add_ps(p1, p2);
// apply kernel
p = _mm_mul_ps(p, kernel);
p = _mm_hadd_ps(p, p);
p = _mm_hadd_ps(p, p);
// write
_mm_store_ss(outBuf + x, p);
}
}
// apply vertical blur
for (int y = 3; y < blurBufferSize.height() - 3; ++y) {
float *inBuf = blurBuffer2 + y * blurBufferSize.width();
float *outBuf = blurBuffer1 + y * blurBufferSize.width();
float *varBuf = tipBuffer + y * blurBufferSize.width();
for (int x = 0; x < blurBufferSize.width() - 3; x += 4) {
// fetch kernel
__m128 kernel1 = globalGaussianKernelTable.fetch(varBuf[x]);
__m128 kernel2 = globalGaussianKernelTable.fetch(varBuf[x + 1]);
__m128 kernel3 = globalGaussianKernelTable.fetch(varBuf[x + 2]);
__m128 kernel4 = globalGaussianKernelTable.fetch(varBuf[x + 3]);
_MM_TRANSPOSE4_PS(kernel1, kernel2, kernel3, kernel4);
// load input
__m128 p1 = _mm_loadu_ps(inBuf + x);
p1 = _mm_add_ps(p1, p1);
__m128 p2 = _mm_loadu_ps(inBuf + x - blurBufferSize.width());
p2 = _mm_add_ps(p2, _mm_loadu_ps(inBuf + x + blurBufferSize.width()));
__m128 p3 = _mm_loadu_ps(inBuf + x - blurBufferSize.width() * 2);
p3 = _mm_add_ps(p3, _mm_loadu_ps(inBuf + x + blurBufferSize.width() * 2));
__m128 p4 = _mm_loadu_ps(inBuf + x - blurBufferSize.width() * 3);
p4 = _mm_add_ps(p4, _mm_loadu_ps(inBuf + x + blurBufferSize.width() * 3));
// apply kernel
p1 = _mm_mul_ps(p1, kernel1);
p2 = _mm_mul_ps(p2, kernel2);
p3 = _mm_mul_ps(p3, kernel3);
p4 = _mm_mul_ps(p4, kernel4);
p1 = _mm_add_ps(p1, p2);
p3 = _mm_add_ps(p3, p4);
auto p = _mm_add_ps(p1, p3);
// store
_mm_storeu_ps(outBuf + x, p);
}
}
for (int y = 0; y < dirtyRect.height(); ++y) {
float *inBuf = blurBuffer1 + (y + 3) * blurBufferSize.width() + 3;
for (int x = 0; x < dirtyRect.width(); ++x) {
int cx = x + dirtyRect.left();
int cy = y + dirtyRect.top();
terrain->landform(cx, cy) = inBuf[x];
}
}
edit->endEdit(terrain);
}
enum class BrushToolEdit::FeatureLevel
{
Sse2
};
void BrushToolEdit::draw(const QPoint &pt, float strength)
{
drawInner<FeatureLevel::Sse2>(pt, strength);
}
template<BrushToolEdit::FeatureLevel level>
void BrushToolEdit::drawInner(const QPoint &pt, float strength)
{
float fixedStrength = params.strength;
strength *= fixedStrength;
auto color = params.color;
std::array<int, 3> colorParts = Terrain::expandColor(color);
__m128 colorMM = _mm_setr_ps(colorParts[0], colorParts[1], colorParts[2], 0);
SseRoundingModeScope roundingModeScope(_MM_ROUND_NEAREST);
(void) roundingModeScope;
switch (tool->type()) {
case BrushType::Blur:
drawBlur(pt, std::min(strength / 5.f, 4.f));
break;
case BrushType::Smoothen:
drawSmoothen(pt, std::min(strength / 5.f, 4.f));
break;
case BrushType::Raise:
case BrushType::Lower:
if (tool->type() == BrushType::Lower) {
fixedStrength = -fixedStrength;
strength = -strength;
}
switch (params.pressureMode) {
case BrushPressureMode::AirBrush:
strength *= 3.f;
drawRaiseLower(pt, [=](float ¤t, float before, float tip) {
(void) before;
current -= tip * strength;
});
break;
case BrushPressureMode::Constant:
if (tool->type() == BrushType::Lower) {
drawRaiseLower(pt, [=](float ¤t, float before, float tip) {
current = Terrain::quantizeOne(std::max(current, before - tip * fixedStrength));
});
} else {
drawRaiseLower(pt, [=](float ¤t, float before, float tip) {
current = Terrain::quantizeOne(std::min(current, before - tip * fixedStrength));
});
}
break;
case BrushPressureMode::Adjustable:
drawRaiseLower(pt, [=](float ¤t, float before, float tip) {
current = Terrain::quantizeOne(before - tip * strength);
});
break;
}
break;
case BrushType::Paint:
switch (params.pressureMode) {
case BrushPressureMode::AirBrush:
strength = 1.f - std::exp2(-strength);
drawColor(pt, [=](quint32 ¤t, quint32 before, float tip) {
(void) before;
// convert current color to FP32
auto currentMM = _mm_castps_si128(_mm_load_ss(reinterpret_cast<float *>(¤t)));
currentMM = _mm_unpacklo_epi8(currentMM, _mm_setzero_si128());
currentMM = _mm_unpacklo_epi16(currentMM, _mm_setzero_si128());
auto currentMF = _mm_cvtepi32_ps(currentMM);
auto factor = _mm_set1_ps(tip * strength);
// blend
auto diff = _mm_sub_ps(colorMM, currentMF);
diff = _mm_mul_ps(diff, factor);
currentMF = _mm_add_ps(currentMF, diff);
// convert to RGB32
currentMF = _mm_add_ps(currentMF, globalDitherSampler.getM128());
currentMM = _mm_cvttps_epi32(currentMF);
currentMM = _mm_packs_epi32(currentMM, currentMM);
currentMM = _mm_packus_epi16(currentMM, currentMM);
_mm_store_ss(reinterpret_cast<float *>(¤t), _mm_castsi128_ps(currentMM));
});
break;
case BrushPressureMode::Constant:
fixedStrength *= 0.01f;
drawColor(pt, [=](quint32 ¤t, quint32 before, float tip) {
// convert current color to FP32
auto currentMM = _mm_castps_si128(_mm_load_ss(reinterpret_cast<float *>(¤t)));
currentMM = _mm_unpacklo_epi8(currentMM, _mm_setzero_si128());
currentMM = _mm_unpacklo_epi16(currentMM, _mm_setzero_si128());
auto currentMF = _mm_cvtepi32_ps(currentMM);
// convert before color to FP32
auto beforeMM = _mm_setr_epi32(before, 0, 0, 0);
beforeMM = _mm_unpacklo_epi8(beforeMM, _mm_setzero_si128());
beforeMM = _mm_unpacklo_epi16(beforeMM, _mm_setzero_si128());
auto beforeMF = _mm_cvtepi32_ps(beforeMM);
// beforeMM = _mm_add_ps(beforeMM, globalDitherSampler.getM128());
// use "before" image to which way of color change is possible, and
// compute possible range of result color
auto diff = _mm_sub_ps(colorMM, beforeMF);
auto factor = _mm_set1_ps(tip * fixedStrength);
auto adddiff = _mm_mul_ps(diff, factor);
beforeMF = _mm_add_ps(beforeMF, adddiff);
auto diffDir = _mm_cmpgt_ps(diff, _mm_setzero_ps());
// compute output image
auto out1 = _mm_max_ps(currentMF, beforeMF);
auto out2 = _mm_min_ps(currentMF, beforeMF);
currentMF = _mm_or_ps(_mm_and_ps(diffDir, out1), _mm_andnot_ps(diffDir, out2));
// convert to RGB32
currentMF = _mm_add_ps(currentMF, globalDitherSampler.getM128());
currentMM = _mm_cvttps_epi32(currentMF);
currentMM = _mm_packs_epi32(currentMM, currentMM);
currentMM = _mm_packus_epi16(currentMM, currentMM);
_mm_store_ss(reinterpret_cast<float *>(¤t), _mm_castsi128_ps(currentMM));
});
break;
case BrushPressureMode::Adjustable:
strength *= 0.01f;
drawColor(pt, [=](quint32 ¤t, quint32 before, float tip) {
// convert before color to FP32
auto beforeMM = _mm_setr_epi32(before, 0, 0, 0);
beforeMM = _mm_unpacklo_epi8(beforeMM, _mm_setzero_si128());
beforeMM = _mm_unpacklo_epi16(beforeMM, _mm_setzero_si128());
auto beforeMF = _mm_cvtepi32_ps(beforeMM);
// blend
auto diff = _mm_sub_ps(colorMM, beforeMF);
auto factor = _mm_set1_ps(tip * strength);
diff = _mm_mul_ps(diff, factor);
beforeMF = _mm_add_ps(beforeMF, diff);
// convert to RGB32
beforeMF = _mm_add_ps(beforeMF, globalDitherSampler.getM128());
beforeMM = _mm_cvttps_epi32(beforeMF);
beforeMM = _mm_packs_epi32(beforeMM, beforeMM);
beforeMM = _mm_packus_epi16(beforeMM, beforeMM);
_mm_store_ss(reinterpret_cast<float *>(¤t), _mm_castsi128_ps(beforeMM));
});
break;
}
break;
}
}