void PrimitiveShader_PC::drawTriangleStrip(const Mat3 &transform, const Vec2 *points, size_t n)
{
prepare(DrawMode::TRIANGLES);
int triangles = n-2;
int N = buffer_.size();
buffer_.resize(N+3*triangles);
auto p = &buffer_[N];
auto const &color = getColor4();
auto half = triangles>>1;
for(int i=0; i<half; i++){
*p++ = Point{transform_helper(transform, points[0]), color};
*p++ = Point{transform_helper(transform, points[1]), color};
*p++ = Point{transform_helper(transform, points[2]), color};
points++;
*p++ = Point{transform_helper(transform, points[1]), color};
*p++ = Point{transform_helper(transform, points[0]), color};
*p++ = Point{transform_helper(transform, points[2]), color};
points++;
}
if(half*2 != triangles){
*p++ = Point{transform_helper(transform, points[0]), color};
*p++ = Point{transform_helper(transform, points[1]), color};
*p++ = Point{transform_helper(transform, points[2]), color};
}
}
void PrimitiveShader_PC::drawTriangleFan(const Mat3 &transform, const Point *points, size_t n)
{
prepare(DrawMode::TRIANGLES);
int triangles = n-2;
int N = buffer_.size();
buffer_.resize(N+3*triangles);
auto p = &buffer_[N];
auto const *q = points+1;
auto p0 = Point{transform_helper(transform,points->pos), points->color};
while(triangles-- > 0){
*p++ = p0;
*p++ = Point{transform_helper(transform, q->pos), q->color};q++;
*p++ = Point{transform_helper(transform, q->pos), q->color};q++;
}
}
static constexpr decltype(auto) apply(Xs&& xs, F&& f) {
using Raw = typename detail::std::remove_reference<Xs>::type;
constexpr auto N = ::std::tuple_size<Raw>::value;
return transform_helper(
detail::std::forward<Xs>(xs),
detail::std::forward<F>(f),
detail::std::make_index_sequence<N>{}
);
}
void PrimitiveShader_PC::pushPoints(const Mat3 &transform, const Vec2 *points, size_t n, const Color4 &color)
{
int N = (int)buffer_.size();
buffer_.resize(N+n);
auto p = &buffer_[N];
for(int i=0; i<n; i++){
*p++ = Point{transform_helper(transform, *points++), color};
}
}
void PrimitiveShader_PC::pushPoints(const Mat3 &transform, const Point *points, size_t n)
{
int N = (int)buffer_.size();
buffer_.resize(N+n);
auto p = &buffer_[N];
for(int i=0; i<n; i++){
*p++ = Point{transform_helper(transform, points->pos), points->color};
points++;
}
}
void PrimitiveShader_PC::drawLineLoop(const Mat3 &transform, const Point *points, size_t n)
{
drawLineStrip(transform, points, n);
buffer_.push_back(Point{transform_helper(transform, points[n-1].pos),points[n-1].color});
buffer_.push_back(Point{transform_helper(transform, points[0].pos),points->color});
}
void PrimitiveShader_PC::drawLineLoop(const Mat3 &transform, const Vec2 *points, size_t n)
{
drawLineStrip(transform, points, n);
buffer_.push_back(Point{transform_helper(transform, points[n-1]),getColor4()});
buffer_.push_back(Point{transform_helper(transform, *points),getColor4()});
}
