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#include "drape_frontend/line_shape_helper.hpp"
#include "drape/glsl_func.hpp"
#include "base/assert.hpp"
namespace df
{
namespace
{
void UpdateNormalBetweenSegments(LineSegment * segment1, LineSegment * segment2)
{
ASSERT(segment1 != nullptr && segment2 != nullptr, ());
float const dotProduct = glsl::dot(segment1->m_leftNormals[EndPoint],
segment2->m_leftNormals[StartPoint]);
float const absDotProduct = fabs(dotProduct);
float const kEps = 1e-5;
if (fabs(absDotProduct - 1.0f) < kEps)
{
// change nothing
return;
}
float const kMaxScalar = 5;
float const crossProduct = glsl::cross(glsl::vec3(segment1->m_tangent, 0),
glsl::vec3(segment2->m_tangent, 0)).z;
if (crossProduct < 0)
{
segment1->m_hasLeftJoin[EndPoint] = true;
segment2->m_hasLeftJoin[StartPoint] = true;
// change right-side normals
glsl::vec2 averageNormal = glsl::normalize(segment1->m_rightNormals[EndPoint] +
segment2->m_rightNormals[StartPoint]);
float const cosAngle = glsl::dot(segment1->m_tangent, averageNormal);
float const widthScalar = 1.0f / sqrt(1.0f - cosAngle * cosAngle);
if (widthScalar < kMaxScalar)
{
segment1->m_rightNormals[EndPoint] = averageNormal;
segment2->m_rightNormals[StartPoint] = averageNormal;
segment1->m_rightWidthScalar[EndPoint].x = widthScalar;
segment1->m_rightWidthScalar[EndPoint].y = widthScalar * cosAngle;
segment2->m_rightWidthScalar[StartPoint] = segment1->m_rightWidthScalar[EndPoint];
}
else
{
segment1->m_generateJoin = false;
}
}
else
{
segment1->m_hasLeftJoin[EndPoint] = false;
segment2->m_hasLeftJoin[StartPoint] = false;
// change left-side normals
glsl::vec2 averageNormal = glsl::normalize(segment1->m_leftNormals[EndPoint] +
segment2->m_leftNormals[StartPoint]);
float const cosAngle = glsl::dot(segment1->m_tangent, averageNormal);
float const widthScalar = 1.0f / sqrt(1.0f - cosAngle * cosAngle);
if (widthScalar < kMaxScalar)
{
segment1->m_leftNormals[EndPoint] = averageNormal;
segment2->m_leftNormals[StartPoint] = averageNormal;
segment1->m_leftWidthScalar[EndPoint].x = widthScalar;
segment1->m_leftWidthScalar[EndPoint].y = widthScalar * cosAngle;
segment2->m_leftWidthScalar[StartPoint] = segment1->m_leftWidthScalar[EndPoint];
}
else
{
segment1->m_generateJoin = false;
}
}
}
} // namespace
void CalculateTangentAndNormals(glsl::vec2 const & pt0, glsl::vec2 const & pt1,
glsl::vec2 & tangent, glsl::vec2 & leftNormal,
glsl::vec2 & rightNormal)
{
tangent = glsl::normalize(pt1 - pt0);
leftNormal = glsl::vec2(-tangent.y, tangent.x);
rightNormal = -leftNormal;
}
void ConstructLineSegments(vector<m2::PointD> const & path, vector<LineSegment> & segments)
{
ASSERT_LESS(1, path.size(), ());
m2::PointD prevPoint = path[0];
for (size_t i = 1; i < path.size(); ++i)
{
m2::PointF const p1 = m2::PointF(prevPoint.x, prevPoint.y);
m2::PointF const p2 = m2::PointF(path[i].x, path[i].y);
if (p1.EqualDxDy(p2, 1.0E-5))
continue;
// Important! Do emplace_back first and fill parameters later.
// Fill parameters first and push_back later will cause ugly bug in clang 3.6 -O3 optimization.
segments.emplace_back(glsl::ToVec2(p1), glsl::ToVec2(p2));
LineSegment & segment = segments.back();
CalculateTangentAndNormals(glsl::ToVec2(p1), glsl::ToVec2(p2), segment.m_tangent,
segment.m_leftBaseNormal, segment.m_rightBaseNormal);
segment.m_leftNormals[StartPoint] = segment.m_leftNormals[EndPoint] = segment.m_leftBaseNormal;
segment.m_rightNormals[StartPoint] = segment.m_rightNormals[EndPoint] = segment.m_rightBaseNormal;
prevPoint = path[i];
}
}
void UpdateNormals(LineSegment * segment, LineSegment * prevSegment, LineSegment * nextSegment)
{
ASSERT(segment != nullptr, ());
if (prevSegment != nullptr)
UpdateNormalBetweenSegments(prevSegment, segment);
if (nextSegment != nullptr)
UpdateNormalBetweenSegments(segment, nextSegment);
}
void GenerateJoinNormals(dp::LineJoin joinType, glsl::vec2 const & normal1, glsl::vec2 const & normal2,
float halfWidth, bool isLeft, float widthScalar, vector<glsl::vec2> & normals,
vector<glsl::vec2> * uv)
{
float const eps = 1e-5;
if (fabs(glsl::dot(normal1, normal2) - 1.0f) < eps)
return;
if (joinType == dp::LineJoin::BevelJoin)
{
glsl::vec2 const n1 = halfWidth * normal1;
glsl::vec2 const n2 = halfWidth * normal2;
normals.push_back(glsl::vec2(0.0f, 0.0f));
normals.push_back(isLeft ? n1 : n2);
normals.push_back(isLeft ? n2 : n1);
if (uv != nullptr)
{
uv->push_back(glsl::vec2(0.5f, 0.5f));
uv->push_back(isLeft ? glsl::vec2(0.5f, 0.0f) : glsl::vec2(0.5f, 1.0f));
uv->push_back(isLeft ? glsl::vec2(0.5f, 0.0f) : glsl::vec2(0.5f, 1.0f));
}
}
else if (joinType == dp::LineJoin::MiterJoin)
{
glsl::vec2 averageNormal = halfWidth * widthScalar * glsl::normalize(normal1 + normal2);
glsl::vec2 const n1 = halfWidth * normal1;
glsl::vec2 const n2 = halfWidth * normal2;
normals.push_back(glsl::vec2(0.0f, 0.0f));
normals.push_back(isLeft ? n1 : averageNormal);
normals.push_back(isLeft ? averageNormal : n1);
normals.push_back(glsl::vec2(0.0f, 0.0f));
normals.push_back(isLeft ? averageNormal : n2);
normals.push_back(isLeft ? n2 : averageNormal);
if (uv != nullptr)
{
uv->push_back(glsl::vec2(0.5f, 0.5f));
uv->push_back(isLeft ? glsl::vec2(0.5f, 0.0f) : glsl::vec2(0.5f, 1.0f));
uv->push_back(isLeft ? glsl::vec2(0.5f, 0.0f) : glsl::vec2(0.5f, 1.0f));
uv->push_back(glsl::vec2(0.5f, 0.5f));
uv->push_back(isLeft ? glsl::vec2(0.5f, 0.0f) : glsl::vec2(0.5f, 1.0f));
uv->push_back(isLeft ? glsl::vec2(0.5f, 0.0f) : glsl::vec2(0.5f, 1.0f));
}
}
else
{
double const segmentAngle = math::pi / 8.0;
double const fullAngle = acos(glsl::dot(normal1, normal2));
int segmentsCount = static_cast<int>(fullAngle / segmentAngle);
if (segmentsCount == 0)
segmentsCount = 1;
double const angle = fullAngle / segmentsCount * (isLeft ? -1.0 : 1.0);
glsl::vec2 const normalizedNormal = glsl::normalize(normal1);
m2::PointD const startNormal(normalizedNormal.x, normalizedNormal.y);
for (int i = 0; i < segmentsCount; i++)
{
m2::PointD n1 = m2::Rotate(startNormal, i * angle) * halfWidth;
m2::PointD n2 = m2::Rotate(startNormal, (i + 1) * angle) * halfWidth;
normals.push_back(glsl::vec2(0.0f, 0.0f));
normals.push_back(isLeft ? glsl::vec2(n1.x, n1.y) : glsl::vec2(n2.x, n2.y));
normals.push_back(isLeft ? glsl::vec2(n2.x, n2.y) : glsl::vec2(n1.x, n1.y));
if (uv != nullptr)
{
uv->push_back(glsl::vec2(0.5f, 0.5f));
uv->push_back(isLeft ? glsl::vec2(0.5f, 0.0f) : glsl::vec2(0.5f, 1.0f));
uv->push_back(isLeft ? glsl::vec2(0.5f, 0.0f) : glsl::vec2(0.5f, 1.0f));
}
}
}
}
void GenerateCapNormals(dp::LineCap capType, glsl::vec2 const & normal1, glsl::vec2 const & normal2,
glsl::vec2 const & direction, float halfWidth, bool isStart, vector<glsl::vec2> & normals,
int segmentsCount)
{
if (capType == dp::ButtCap)
return;
if (capType == dp::SquareCap)
{
glsl::vec2 const n1 = halfWidth * normal1;
glsl::vec2 const n2 = halfWidth * normal2;
glsl::vec2 const n3 = halfWidth * (normal1 + direction);
glsl::vec2 const n4 = halfWidth * (normal2 + direction);
normals.push_back(n2);
normals.push_back(isStart ? n4 : n1);
normals.push_back(isStart ? n1 : n4);
normals.push_back(n1);
normals.push_back(isStart ? n4 : n3);
normals.push_back(isStart ? n3 : n4);
}
else
{
double const segmentSize = math::pi / segmentsCount * (isStart ? -1.0 : 1.0);
glsl::vec2 const normalizedNormal = glsl::normalize(normal2);
m2::PointD const startNormal(normalizedNormal.x, normalizedNormal.y);
for (int i = 0; i < segmentsCount; i++)
{
m2::PointD n1 = m2::Rotate(startNormal, i * segmentSize) * halfWidth;
m2::PointD n2 = m2::Rotate(startNormal, (i + 1) * segmentSize) * halfWidth;
normals.push_back(glsl::vec2(0.0f, 0.0f));
normals.push_back(isStart ? glsl::vec2(n1.x, n1.y) : glsl::vec2(n2.x, n2.y));
normals.push_back(isStart ? glsl::vec2(n2.x, n2.y) : glsl::vec2(n1.x, n1.y));
}
}
}
glsl::vec2 GetNormal(LineSegment const & segment, bool isLeft, ENormalType normalType)
{
if (normalType == BaseNormal)
return isLeft ? segment.m_leftBaseNormal : segment.m_rightBaseNormal;
int const index = (normalType == StartNormal) ? StartPoint : EndPoint;
return isLeft ? segment.m_leftWidthScalar[index].x * segment.m_leftNormals[index]:
segment.m_rightWidthScalar[index].x * segment.m_rightNormals[index];
}
float GetProjectionLength(glsl::vec2 const & newPoint, glsl::vec2 const & startPoint,
glsl::vec2 const & endPoint)
{
glsl::vec2 const v1 = endPoint - startPoint;
glsl::vec2 const v2 = newPoint - startPoint;
float const squareLen = glsl::dot(v1, v1);
float const proj = glsl::dot(v1, v2) / squareLen;
return sqrt(squareLen) * my::clamp(proj, 0.0f, 1.0f);
}
} // namespace df
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